@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* Colors - Light Mode Only */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f4;
  --bg-card: #ffffff;
  --bg-hover: #e8eaed;

  --text-primary: #1a1a2e;
  --text-secondary: #4a4a5a;
  --text-muted: #8a8a9a;

  --accent-primary: #7c3aed;
  --accent-secondary: #a855f7;
  --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #a855f7 50%, #c084fc 100%);

  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;

  --border-color: #e2e4e6;
  --border-subtle: #f0f0f4;

  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 20px rgba(124, 58, 237, 0.3);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1rem;
}

/* ========================================
   DARK MODE THEME
   ======================================== */

[data-theme="dark"] {
  /* Background colors */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-hover: #334155;

  /* Text colors */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;

  /* Accent colors - slightly adjusted for dark mode */
  --accent-primary: #a78bfa;
  --accent-secondary: #c4b5fd;
  --accent-gradient: linear-gradient(135deg, #a78bfa 0%, #c4b5fd 50%, #ddd6fe 100%);

  /* Feedback colors */
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;

  /* Borders */
  --border-color: #334155;
  --border-subtle: #1e293b;

  /* Shadows - adjusted for dark mode */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px rgba(167, 139, 250, 0.4);
}

/* Smooth theme transition */
:root,
[data-theme="dark"] {
  transition: background-color var(--transition-base),
    color var(--transition-base);
}

/* ========================================
   NEW UX COMPONENTS
   ======================================== */

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-full);
  background: var(--bg-hover);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid var(--border-color);
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  transform: scale(1.05);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 2px;
}

.theme-toggle-placeholder {
  display: inline-block;
  opacity: 0;
}

/* Loading Spinner */
.loading-spinner-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.loading-spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-xl);
}

.loading-spinner {
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-message {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  min-height: 300px;
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-lg);
  opacity: 0.6;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.empty-state-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  max-width: 400px;
  margin-bottom: var(--space-lg);
}

.empty-state-action {
  padding: var(--space-sm) var(--space-lg);
  background: var(--accent-primary);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-fast);
  min-width: 120px;
  min-height: 44px;
}

.empty-state-action:hover {
  background: var(--accent-secondary);
  transform: translateY(-1px);
}

.empty-state-action:active {
  transform: translateY(0);
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent-primary);
  color: white;
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 10000;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-sm);
  left: var(--space-sm);
}

/* Focus Visible (Accessibility) */
*:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

*:focus {
  outline: none;
}

/* Keyboard Shortcuts Helper */
.keyboard-shortcuts-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: var(--space-lg);
}

.keyboard-shortcuts-modal {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  max-width: 600px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.keyboard-shortcuts-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.keyboard-shortcuts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.keyboard-shortcut-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.keyboard-shortcut-description {
  color: var(--text-primary);
  font-weight: 500;
}

.keyboard-shortcut-keys {
  display: flex;
  gap: var(--space-xs);
}

.keyboard-key {
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-width: 24px;
  text-align: center;
}

/* Toast Notification Overrides (for react-hot-toast) */
.toast-success {
  background: var(--bg-card) !important;
  color: var(--text-primary) !important;
  border: 1px solid var(--success) !important;
  box-shadow: var(--shadow-md) !important;
}

.toast-error {
  background: var(--bg-card) !important;
  color: var(--text-primary) !important;
  border: 1px solid var(--error) !important;
  box-shadow: var(--shadow-md) !important;
}

/* Export Format Buttons */
.export-buttons {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.export-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.export-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.export-btn:active {
  transform: translateY(0);
}

.export-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Toolbar buttons container - make responsive */
.toolbar-buttons,
.table-toolbar {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  align-items: center;
}

@media (max-width: 768px) {

  .toolbar-buttons,
  .table-toolbar {
    gap: var(--space-xs);
    width: 100%;
  }

  /* Allow buttons to wrap on mobile */
  .toolbar-buttons {
    flex-wrap: wrap !important;
  }
}

/* Copy, CSV, Print buttons */
.copy-all-button,
.csv-button,
.print-button,
.export-btn {
  min-height: 44px;
  min-width: 44px;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

@media (max-width: 640px) {

  /* Smaller buttons on very small screens */
  .copy-all-button,
  .csv-button,
  .print-button,
  .export-btn {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.8125rem;
  }

  /* Stack buttons vertically if needed */
  .toolbar-buttons {
    flex-direction: row;
    justify-content: flex-start;
  }
}

/* Copy button feedback animation */
.copy-all-button:active,
.copy-button:active {
  animation: copyPulse 0.3s ease;
  background: var(--success);
  color: white;
  border-color: var(--success);
}

@keyframes copyPulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(0.95);
  }
}

/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* ========================================
   NAVIGATION
   ======================================== */

.main-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* Dark mode navigation adjustments */
[data-theme="dark"] .main-nav {
  background: rgba(15, 23, 42, 0.95);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-md) var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  flex-wrap: nowrap;
}

@media (max-width: 768px) {
  .nav-container {
    gap: var(--space-xs);
    padding: var(--space-sm) var(--container-padding);
  }

  /* Hide language selector on mobile */
  .lang-selector {
    display: none !important;
  }

  /* Always show theme toggle on mobile */
  .theme-toggle {
    display: flex !important;
  }
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.logo-text {
  color: var(--text-primary);
}

.logo-accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-n {
  background: linear-gradient(90deg, var(--text-primary) 50%, var(--accent-primary) 50%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--space-xs);
}

.desktop-nav {
  display: flex;
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }
}

.nav-link {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-link.active {
  color: var(--accent-primary);
  background: rgba(124, 58, 237, 0.1);
}

/* Language Selector */
.lang-selector {
  position: relative;
}

.lang-button {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.lang-button:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.lang-button .chevron {
  transition: transform var(--transition-fast);
}

.lang-button .chevron.open {
  transform: rotate(180deg);
}

.lang-menu {
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: var(--space-xs);
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.lang-option {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  transition: background var(--transition-fast);
}

.lang-option:hover {
  background: var(--bg-hover);
}

.lang-option.active {
  background: rgba(124, 58, 237, 0.1);
}

.lang-native {
  font-weight: 500;
  color: var(--text-primary);
}

.lang-english {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Mobile Navigation */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex !important;
  }
}

/* Explicitly hide on desktop */
@media (min-width: 769px) {
  .mobile-menu-btn {
    display: none !important;
  }
}

.hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 24px;
}

.hamburger span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

.hamburger.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 65px;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: calc(100vh - 65px);
  background: var(--bg-primary);
  padding: var(--space-lg);
  z-index: 99;
  overflow-y: auto;
  overflow-x: hidden;
}

.mobile-nav.open {
  display: block;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.mobile-nav-link {
  display: block;
  padding: var(--space-md);
  font-size: 1.125rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background: var(--bg-hover);
}

.mobile-lang-section {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.mobile-lang-section h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mobile-lang-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.mobile-lang-btn {
  padding: var(--space-sm) var(--space-md);
  text-align: center;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  transition: all var(--transition-fast);
}

.mobile-lang-btn:hover,
.mobile-lang-btn.active {
  background: var(--accent-primary);
  color: white;
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }
}

/* ========================================
   BREADCRUMBS
   ======================================== */

.breadcrumbs {
  padding: var(--space-md) 0;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.875rem;
}

.breadcrumb-item a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--accent-primary);
}

.breadcrumb-separator {
  color: var(--text-muted);
  margin: 0 var(--space-xs);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

/* ========================================
   MAIN CONTENT AREA
   ======================================== */

.page-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-lg) var(--container-padding);
}

.page-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.page-header h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-intro {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ========================================
   ROMAN NUMERAL TABLE
   ======================================== */

.roman-table-container {
  margin: var(--space-xl) 0;
}

.table-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.search-box {
  flex: 1;
  min-width: 200px;
  position: relative;
}

.search-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  padding-left: 48px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.toolbar-buttons {
  display: flex;
  gap: var(--space-xs);
}

.copy-all-button,
.pdf-button,
.csv-button,
.print-button {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.copy-all-button:hover,
.pdf-button:hover,
.csv-button:hover,
.print-button:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.csv-button {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--success);
}

.csv-button:hover {
  background: var(--success);
  border-color: var(--success);
  color: white;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.filter-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.filter-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.filter-buttons {
  display: flex;
  gap: var(--space-xs);
}

.filter-btn {
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.filter-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.filter-checkboxes {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.filter-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.filter-checkbox input[type="checkbox"] {
  display: none;
}

.checkbox-custom {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  position: relative;
  transition: all var(--transition-fast);
}

.filter-checkbox:hover .checkbox-custom {
  border-color: var(--accent-primary);
}

.filter-checkbox input[type="checkbox"]:checked+.checkbox-custom {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.filter-checkbox input[type="checkbox"]:checked+.checkbox-custom::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 4px;
  height: 8px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* Subtractive Highlighting */
.subtractive-row {
  background: rgba(251, 191, 36, 0.08) !important;
  border-left: 3px solid #fbbf24 !important;
  border-right: 3px solid #fbbf24 !important;
  transition: all 0.2s ease;
}

.subtractive-row:hover {
  background: rgba(251, 191, 36, 0.15) !important;
  box-shadow: 0 0 0 2px rgba(251, 191, 36, 0.3);
}

.subtractive-highlight {
  color: #d97706 !important;
  font-weight: 800 !important;
  text-shadow: 0 0 1px rgba(217, 119, 6, 0.3);
  position: relative;
}

.subtractive-card {
  border: 2px solid #fbbf24 !important;
  background: rgba(251, 191, 36, 0.08) !important;
  box-shadow: 0 2px 8px rgba(251, 191, 36, 0.2);
}

@media (max-width: 768px) {
  .table-toolbar {
    flex-direction: column;
  }

  .toolbar-buttons {
    width: 100%;
    justify-content: space-between;
  }

  .filter-bar {
    flex-direction: column;
    gap: var(--space-md);
  }

  .filter-group {
    flex-wrap: wrap;
  }

  .filter-checkboxes {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }
}

@media print {

  .filter-bar,
  .toolbar-buttons {
    display: none !important;
  }
}

.results-count {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

/* Table */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.roman-table {
  width: 100%;
  border-collapse: collapse;
}

.roman-table th,
.roman-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

.roman-table th {
  background: var(--bg-tertiary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.roman-table tbody tr {
  transition: background var(--transition-fast);
}

.roman-table tbody tr:hover {
  background: var(--bg-hover);
}

.number-cell {
  font-weight: 600;
  color: var(--text-primary);
  width: 100px;
}

.roman-cell {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent-secondary);
  letter-spacing: 0.05em;
}

.copy-cell {
  width: 50px;
  text-align: center;
}

/* Copy Button */
.copy-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.copy-button:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.copy-button.copied {
  color: var(--success);
}

/* Mobile Cards */
.mobile-cards {
  display: none;
}

@media (max-width: 640px) {
  .desktop-table {
    display: none;
  }

  .mobile-cards {
    display: grid;
    gap: var(--space-sm);
  }

  .number-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
  }

  .card-content {
    display: flex;
    align-items: center;
    gap: var(--space-md);
  }

  .card-number {
    font-weight: 700;
    font-size: 1.125rem;
    min-width: 50px;
  }

  .card-equals {
    color: var(--text-muted);
  }

  .card-roman {
    font-family: var(--font-mono);
    color: var(--accent-secondary);
    font-size: 1.125rem;
    letter-spacing: 0.05em;
  }
}

/* Load More */
.load-more-container {
  display: flex;
  justify-content: center;
  margin-top: var(--space-xl);
}

.load-more-button {
  padding: var(--space-md) var(--space-2xl);
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  color: white;
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-glow);
}

.load-more-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(124, 58, 237, 0.4);
}

/* ========================================
   CONVERTER
   ======================================== */

.converter-container,
.calculator-container,
.worksheet-generator-card {
  max-width: 600px;
  margin: var(--space-xl) auto;
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
}

.date-converter {
  max-width: 700px;
  margin: var(--space-xl) auto;
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
}

.calculator-card {
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.roman-preview {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--accent-secondary);
  letter-spacing: 0.05em;
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  margin-top: var(--space-sm);
}

.content-section {
  margin-top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.content-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.converter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: var(--space-xs);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.converter-tab {
  flex: 1 1 auto;
  min-width: 60px;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  text-align: center;
}

.converter-tab:hover {
  color: var(--text-primary);
}

.converter-tab.active {
  background: var(--accent-primary);
  color: white;
}

.direction-toggle {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}

.direction-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.direction-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.direction-btn.active {
  background: rgba(124, 58, 237, 0.1);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.converter-input-area {
  margin-bottom: var(--space-lg);
}

.input-group {
  margin-bottom: var(--space-md);
}

.input-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.converter-input,
.converter-textarea {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1.125rem;
  transition: all var(--transition-fast);
}

.converter-input:focus,
.converter-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.converter-textarea {
  resize: vertical;
  min-height: 120px;
  font-family: var(--font-mono);
}

.range-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.converter-actions {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.convert-button {
  flex: 1;
  padding: var(--space-md);
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.convert-button:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.clear-button {
  padding: var(--space-md) var(--space-xl);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.clear-button:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.converter-error {
  padding: var(--space-md);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-lg);
  color: var(--error);
  margin-bottom: var(--space-lg);
}

.converter-result {
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.converter-result h3 {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.result-single {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.result-value {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--accent-primary);
  letter-spacing: 0.05em;
  text-shadow: 0 0 15px rgba(124, 58, 237, 0.2);
}

.result-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 300px;
  overflow-y: auto;
}

.result-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm);
  border-radius: var(--radius-md);
}

.result-item:hover {
  background: var(--bg-hover);
}

.result-number {
  min-width: 60px;
  font-weight: 600;
  color: var(--text-primary);
}

.result-equals {
  color: var(--text-muted);
}

.result-roman {
  flex: 1;
  font-family: var(--font-mono);
  color: var(--accent-primary);
  font-weight: 700;
  font-size: 1.125rem;
}

.converter-history {
  border-top: 1px solid var(--border-color);
  padding-top: var(--space-lg);
}

.converter-history h4 {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.history-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.history-arrow {
  color: var(--text-muted);
}

.history-output {
  font-family: var(--font-mono);
  color: var(--accent-secondary);
}

/* PDF Generator Section in Converter */
.pdf-generator-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.pdf-description {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(236, 72, 153, 0.05));
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius-lg);
}

.pdf-description svg {
  color: var(--accent-primary);
  flex-shrink: 0;
}

.pdf-description p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.pdf-quick-presets {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.pdf-preview-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  text-align: center;
}

.pdf-preview-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.pdf-preview-count {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.pdf-success-msg {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-lg);
  color: var(--success);
  font-weight: 500;
  animation: fadeIn 0.3s ease;
}

.pdf-generate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.pdf-generate-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

@media (max-width: 480px) {
  .pdf-description {
    flex-direction: column;
    text-align: center;
  }

  .pdf-quick-presets {
    justify-content: center;
  }

  .pdf-preview-box {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

/* ========================================
   FOOTER
   ======================================== */

.site-footer {
  margin-top: var(--space-3xl);
  padding: var(--space-2xl) var(--container-padding);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.footer-main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

@media (max-width: 768px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 800;
  display: block;
  margin-bottom: var(--space-md);
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-links h4,
.footer-legal-links h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.footer-links ul,
.footer-legal-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a,
.footer-legal-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover,
.footer-legal-links a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.copyright {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   MILLION GUIDE PAGE
   ======================================== */

.guide-content {
  max-width: 800px;
  margin: 0 auto;
}

.guide-section {
  margin-bottom: var(--space-2xl);
}

.guide-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.guide-section p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.vinculum-example {
  display: inline-block;
  text-decoration: overline;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent-secondary);
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.example-card {
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
}

.example-number {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.example-roman {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--accent-secondary);
  font-weight: 600;
}

/* ========================================
   ENGAGEMENT FEATURES CSS
   ======================================== */

/* History Sections */
.history-section,
.converter-history {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.history-section h3,
.history-section h4,
.converter-history h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-height: 300px;
  overflow-y: auto;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.history-item:hover {
  background: var(--bg-hover);
}

.history-item-content {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
}

.history-reuse-btn {
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.75rem;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.clear-history-btn {
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  transition: color var(--transition-fast);
}

.clear-history-btn:hover {
  color: var(--accent-primary);
}

/* Step-by-Step Animation */
.steps-section,
.conversion-steps,
.calc-steps {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.steps-section h3,
.steps-section h4,
.conversion-steps h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.steps-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.step-item,
.calc-step {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm);
  margin-bottom: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  animation: fadeIn 0.3s ease;
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--accent-primary);
  color: white;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
}

.step-text,
.step-content {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Comparison Section */
.comparison-section,
.conversion-comparison {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.comparison-section h3,
.comparison-section h2,
.conversion-comparison h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-sm);
}

.comparison-item {
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  text-align: center;
}

.comparison-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.comparison-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent-secondary);
}

/* Share Section */
.share-section {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.share-section h3,
.share-section h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.share-buttons {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.share-btn {
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.share-btn:hover {
  transform: translateY(-2px);
}

/* Mode Toggle Buttons */
.mode-toggle {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.mode-btn {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.mode-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

/* Practice Mode Card */
.practice-card {
  display: none;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.practice-card.active {
  display: block;
}

.practice-question {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.practice-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 1.25rem;
  text-align: center;
  margin-bottom: var(--space-md);
}

.practice-input:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.practice-actions {
  display: flex;
  gap: var(--space-sm);
}

.practice-btn {
  flex: 1;
  padding: var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.practice-btn.check {
  background: var(--success);
  color: white;
}

.practice-btn.new {
  background: var(--accent-primary);
  color: white;
}

.practice-feedback {
  text-align: center;
  padding: var(--space-md);
  margin-top: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 600;
}

.practice-feedback.correct {
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
}

.practice-feedback.incorrect {
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

/* Challenge Card */
.challenge-card {
  display: none;
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(168, 85, 247, 0.1));
  border: 2px solid var(--accent-primary);
  border-radius: var(--radius-lg);
}

.challenge-card.active {
  display: block;
}

.challenge-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--accent-primary);
}

/* Operation Hints */
.hint-box,
.operation-hint {
  padding: var(--space-md);
  background: rgba(251, 191, 36, 0.1);
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.hint-box strong,
.operation-hint strong {
  color: #d97706;
}

/* Favorites Section */
.favorites-section {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.favorites-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.favorites-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-sm);
}

.favorite-item {
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.favorite-item:hover {
  transform: translateY(-2px);
}

.favorite-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.favorite-btn:hover {
  border-color: var(--error);
  color: var(--error);
}

/* Font Preview */
.font-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.font-preview-card {
  padding: var(--space-lg);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  text-align: center;
}

/* QR Code Section */
.qr-section {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.qr-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

#qr-code-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
}

#qr-code-container img {
  max-width: 200px;
}

/* Date Comparison */
.comparison-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

.comparison-item {
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  text-align: center;
}

/* Quiz Section */
.quiz-section,
.difficulty-quiz {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.difficulty-quiz h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.quiz-btn {
  padding: var(--space-md) var(--space-xl);
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

#quiz-container {
  margin-top: var(--space-lg);
}

#quiz-question {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--space-lg);
}

#quiz-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

#quiz-options button {
  padding: var(--space-md);
  border: 2px solid var(--accent-primary);
  background: transparent;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

#quiz-options button:hover {
  background: var(--accent-primary);
  color: white;
}

/* Gallery Section */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.gallery-item {
  padding: var(--space-lg);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.gallery-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.gallery-btn:hover {
  background: var(--accent-secondary);
}

/* Design Preview Section */
.design-preview-section {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.design-preview-section h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

/* Historical Section */
.historical-section {
  margin-top: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.historical-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
}

.historical-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
}

/* Result Display Classes */
.result-arabic {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

.result-equals {
  color: var(--text-muted);
  font-weight: 500;
}

.result-roman {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-secondary);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: var(--accent-primary);
  color: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Copy Button Enhancement */
.copy-btn {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.copy-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

/* Large Result Display */
.large-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.roman-result {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent-secondary);
  letter-spacing: 0.05em;
}

.presets {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.preset-link {
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.preset-link:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

/* ========================================
   HOME PAGE
   ======================================== */

.home-hero {
  text-align: center;
  padding: var(--space-3xl) 0;
}

/* ========================================
   CONTACT PAGE
   ======================================== */

.contact-info {
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  margin: var(--space-md) 0;
}

.contact-info p {
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
}

.contact-topics,
.message-guidelines {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
}

.contact-topics li,
.message-guidelines li {
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-primary);
  color: var(--text-secondary);
}

.contact-topics li a {
  color: var(--accent-primary);
  font-weight: 600;
}

/* ========================================
   CALCULATOR PAGE
   ======================================== */

.operation-examples {
  margin: var(--space-md) 0;
}

.operation-examples dt {
  font-weight: 700;
  color: var(--text-primary);
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.operation-examples dd {
  margin-left: 0;
  margin-bottom: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  line-height: 1.6;
}

.rules-list,
.educational-uses,
.real-world-examples {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
}

.rules-list li,
.educational-uses li,
.real-world-examples li {
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-primary);
  color: var(--text-secondary);
}

.tools-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-md) 0;
}

.tool-link-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--text-primary);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border: 1px solid var(--border-color);
}

.tool-link-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-primary);
}

.tool-emoji {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.tool-link-card strong {
  color: var(--accent-primary);
  margin-bottom: var(--space-xs);
  font-size: 1.1rem;
}

.tool-link-card span:last-child {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ========================================
   ABOUT PAGE
   ======================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-lg) 0;
}

.features-grid article {
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-fast);
}

.features-grid article:hover {
  transform: translateY(-4px);
}

.features-grid h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.features-grid p {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  font-size: 0.9375rem;
}

.feature-link {
  color: var(--accent-primary);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color var(--transition-fast);
}

.feature-link:hover {
  color: var(--accent-secondary);
}

.language-support {
  text-align: center;
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  margin-top: var(--space-lg);
  font-size: 0.9375rem;
}

.examples-list,
.historical-uses,
.educational-benefits {
  list-style: none;
  padding: 0;
  margin: var(--space-md) 0;
}

.examples-list li,
.historical-uses li,
.educational-benefits li {
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-primary);
  color: var(--text-secondary);
}

.home-hero h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

.home-hero .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home-hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

.home-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.home-card {
  display: block;
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

.home-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.home-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.home-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

/* ========================================
   PDF CUSTOM RANGE MODAL
   ======================================== */

.pdf-buttons {
  display: flex;
  gap: var(--space-sm);
}

.pdf-button.pdf-custom {
  background: transparent;
  border: 1px dashed var(--border-color);
}

.pdf-button.pdf-custom:hover {
  border-style: solid;
  border-color: var(--accent-primary);
  background: rgba(124, 58, 237, 0.1);
  color: var(--accent-primary);
}

.pdf-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  animation: fadeIn 0.2s ease;
}

.pdf-modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.pdf-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
}

.pdf-modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.pdf-modal-close {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  transition: all var(--transition-fast);
}

.pdf-modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.pdf-modal-body {
  padding: var(--space-lg);
}

.pdf-modal-hint {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.pdf-range-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.pdf-input-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.pdf-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  transition: all var(--transition-fast);
}

.pdf-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.pdf-quick-ranges {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-lg);
}

.quick-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.quick-range-btn {
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.quick-range-btn:hover:not(:disabled) {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

.quick-range-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pdf-error {
  padding: var(--space-md);
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-lg);
  color: #ef4444;
  font-size: 0.875rem;
  margin-bottom: var(--space-lg);
}

.pdf-preview {
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.pdf-modal-footer {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

.pdf-cancel-btn {
  flex: 1;
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.pdf-cancel-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.pdf-download-btn {
  flex: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.pdf-download-btn:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

@media (max-width: 480px) {
  .pdf-modal {
    margin: var(--space-md);
    max-height: 90vh;
    overflow-y: auto;
  }

  .pdf-range-inputs {
    grid-template-columns: 1fr;
  }

  .pdf-modal-footer {
    flex-direction: column;
  }

  .pdf-cancel-btn,
  .pdf-download-btn {
    flex: unset;
    width: 100%;
  }
}

/* Print Styles */
@media print {

  .main-nav,
  .site-footer,
  .table-toolbar,
  .copy-button,
  .load-more-container {
    display: none !important;
  }

  .roman-table {
    font-size: 10pt;
  }

  body {
    background: white;
    color: black;
  }
}

/* =====================================================
   NEW FEATURES STYLES
   ===================================================== */

/* Year Converter */
.year-converter {
  max-width: 600px;
  margin: 0 auto;
}

.converter-input-group {
  margin-bottom: var(--space-lg);
}

.converter-input-group label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.converter-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1.25rem;
  text-align: center;
}

.year-result {
  text-align: center;
  padding: var(--space-xl);
  background: var(--bg-tertiary);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-xl);
}

.year-result-label {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.year-result-value {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.roman-large {
  font-size: 3rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.popular-years,
.birth-year-section {
  margin-top: var(--space-xl);
}

.popular-years h3,
.birth-year-section h3 {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

.year-grid,
.birth-year-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-md);
}

.year-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.year-btn:hover,
.year-btn.active {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
}

.year-btn.active {
  box-shadow: 0 0 0 2px var(--accent-primary);
}

.year-number {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.year-roman {
  font-size: 0.9rem;
  color: var(--accent-secondary);
  font-weight: 600;
}

.year-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.year-btn.small {
  padding: var(--space-sm);
}

.year-btn.small .year-number {
  font-size: 1rem;
}

.year-btn.small .year-roman {
  font-size: 0.8rem;
}

/* Quiz Styles - Premium Design */
.quiz-container {
  max-width: 650px;
  margin: 0 auto;
  padding: var(--space-xl);
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.05) 0%, rgba(79, 70, 229, 0.08) 100%);
  border-radius: var(--radius-2xl);
  border: 1px solid rgba(124, 58, 237, 0.15);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(124, 58, 237, 0.08);
}

.quiz-levels {
  text-align: center;
  padding: var(--space-lg) 0;
}

.quiz-levels h3 {
  margin-bottom: var(--space-xl);
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.level-buttons {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.level-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xl) var(--space-2xl);
  border: 2px solid transparent;
  border-radius: var(--radius-2xl);
  background: var(--bg-card);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 1.35rem;
  font-weight: 700;
  position: relative;
  overflow: hidden;
  min-width: 140px;
}

.level-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.level-btn span {
  font-size: 0.9rem;
  font-weight: 500;
  opacity: 0.7;
  margin-top: 0;
}

.level-btn.easy {
  border-color: rgba(34, 197, 94, 0.4);
  color: #22c55e;
}

.level-btn.easy::before {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(34, 197, 94, 0.05));
}

.level-btn.easy:hover {
  border-color: #22c55e;
  box-shadow: 0 8px 24px rgba(34, 197, 94, 0.25), 0 0 0 1px rgba(34, 197, 94, 0.1);
}

.level-btn.medium {
  border-color: rgba(245, 158, 11, 0.4);
  color: #f59e0b;
}

.level-btn.medium::before {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.05));
}

.level-btn.medium:hover {
  border-color: #f59e0b;
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.25), 0 0 0 1px rgba(245, 158, 11, 0.1);
}

.level-btn.hard {
  border-color: rgba(239, 68, 68, 0.4);
  color: #ef4444;
}

.level-btn.hard::before {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(239, 68, 68, 0.05));
}

.level-btn.hard:hover {
  border-color: #ef4444;
  box-shadow: 0 8px 24px rgba(239, 68, 68, 0.25), 0 0 0 1px rgba(239, 68, 68, 0.1);
}

.level-btn:hover {
  transform: translateY(-4px) scale(1.02);
}

.level-btn:hover::before {
  opacity: 1;
}

.level-btn:active {
  transform: translateY(-2px) scale(1.01);
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
  padding: var(--space-md) var(--space-lg);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.quiz-progress {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
}

.quiz-score {
  color: var(--accent-secondary);
  font-weight: 700;
  font-size: 1rem;
  padding: var(--space-xs) var(--space-md);
  background: rgba(124, 58, 237, 0.1);
  border-radius: var(--radius-full);
}

.quiz-question {
  animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.quiz-question h3 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: var(--space-2xl);
  color: var(--text-primary);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.quiz-option {
  padding: var(--space-xl) var(--space-lg);
  background: rgba(255, 255, 255, 0.03);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  font-size: 1.6rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.quiz-option::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.quiz-option:hover:not(:disabled) {
  background: rgba(124, 58, 237, 0.1);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.15);
}

.quiz-option:hover:not(:disabled)::before {
  opacity: 1;
}

.quiz-option.correct {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.2), rgba(34, 197, 94, 0.1));
  border-color: #22c55e;
  color: #22c55e;
  animation: correctPulse 0.5s ease;
}

@keyframes correctPulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.02);
  }
}

.quiz-option.incorrect {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(239, 68, 68, 0.1));
  border-color: #ef4444;
  color: #ef4444;
  animation: shake 0.4s ease;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-5px);
  }

  75% {
    transform: translateX(5px);
  }
}

.quiz-feedback {
  text-align: center;
  padding: var(--space-lg);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-lg);
  font-weight: 600;
  font-size: 1.1rem;
  animation: fadeInUp 0.3s ease-out;
}

.quiz-feedback.correct {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.15), rgba(34, 197, 94, 0.08));
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

.quiz-feedback.incorrect {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(239, 68, 68, 0.08));
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.quiz-btn {
  display: block;
  width: 100%;
  padding: var(--space-lg);
  border: none;
  border-radius: var(--radius-xl);
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.quiz-btn.primary {
  background: linear-gradient(135deg, #7c3aed, #6366f1);
  color: white;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
}

.quiz-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(124, 58, 237, 0.45);
}

.quiz-btn.primary:active {
  transform: translateY(0);
}

.quiz-completed {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  animation: fadeInUp 0.5s ease-out;
}

.quiz-completed h3 {
  font-size: 1.75rem;
  margin-bottom: var(--space-xl);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

.final-score {
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.score-number {
  font-size: 4rem;
  font-weight: 900;
  background: linear-gradient(135deg, #7c3aed, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.03em;
}

.score-percent {
  font-size: 1.75rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.score-emoji {
  font-size: 5rem;
  margin-bottom: var(--space-xl);
  animation: bounce 1s ease infinite;
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

/* Quiz responsive adjustments */
@media (max-width: 600px) {
  .quiz-container {
    padding: var(--space-lg);
    margin: 0 var(--space-sm);
  }

  .level-buttons {
    flex-direction: column;
    gap: var(--space-md);
  }

  .level-btn {
    width: 100%;
    padding: var(--space-lg);
  }

  .quiz-question h3 {
    font-size: 1.75rem;
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }

  .quiz-option {
    font-size: 1.3rem;
    padding: var(--space-lg);
  }

  .score-number {
    font-size: 3rem;
  }

  .score-emoji {
    font-size: 4rem;
  }
}

/* Calculator Styles */
.calculator-container {
  max-width: 600px;
  margin: 0 auto;
}

.calculator-inputs {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.calc-input-group {
  position: relative;
}

.calc-input-group label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.calc-input {
  width: 100%;
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1.25rem;
}

.roman-preview {
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent-secondary);
  font-weight: 600;
  margin-top: 12px;
}

.calc-operation {
  text-align: center;
}

.calc-operation label {
  display: block;
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.operation-buttons {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
}

.op-btn {
  width: 50px;
  height: 50px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
  font-size: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.op-btn:hover,
.op-btn.active {
  border-color: var(--accent-primary);
  background: var(--bg-hover);
}

.op-btn.active {
  box-shadow: 0 0 0 2px var(--accent-primary);
}

.calc-actions {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.calc-btn {
  flex: 1;
  padding: var(--space-md);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.calc-btn.primary {
  background: var(--accent-gradient);
  color: white;
}

.calc-btn.secondary {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.calc-steps {
  background: var(--bg-tertiary);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
}

.calc-steps h4 {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

.calc-step {
  padding: var(--space-sm) 0;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
}

.calc-step:last-child {
  border-bottom: none;
  font-weight: 600;
  color: var(--accent-secondary);
}

.calc-result {
  text-align: center;
  padding: var(--space-xl);
  background: var(--accent-gradient);
  border-radius: var(--radius-xl);
  color: white;
}

.result-label {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: var(--space-sm);
}

.result-value {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.result-arabic {
  font-size: 2rem;
  font-weight: 800;
}

.result-equals {
  font-size: 1.5rem;
  opacity: 0.8;
}

.result-roman {
  font-size: 2rem;
  font-weight: 800;
}

/* Clock Face Styles */
.clock-container {
  max-width: 600px;
  margin: 0 auto;
}

.clock-face {
  width: 300px;
  height: 300px;
  margin: 0 auto var(--space-xl);
  background: var(--bg-tertiary);
  border: 4px solid var(--accent-primary);
  border-radius: 50%;
  position: relative;
  box-shadow: var(--shadow-lg), inset 0 0 30px rgba(0, 0, 0, 0.3);
}

.clock-inner {
  width: 100%;
  height: 100%;
  position: relative;
}

.clock-number {
  position: absolute;
  transform: translate(-50%, -50%);
  text-align: center;
}

.clock-roman {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.clock-center {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--accent-primary);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
}

.clock-hand {
  position: absolute;
  background: var(--text-primary);
  left: 50%;
  transform-origin: bottom center;
  border-radius: 2px;
}

.clock-hand.hour {
  width: 4px;
  height: 25%;
  bottom: 50%;
  margin-left: -2px;
}

.clock-hand.minute {
  width: 2px;
  height: 35%;
  bottom: 50%;
  margin-left: -1px;
}

.clock-info {
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
}

.clock-info h3 {
  color: var(--accent-secondary);
  margin-bottom: var(--space-md);
}

.clock-info p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.clock-numbers-list h3 {
  margin-bottom: var(--space-md);
}

.clock-numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
}

.clock-number-item {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
}

.clock-number-item .num {
  color: var(--text-muted);
}

.clock-number-item .eq {
  color: var(--text-muted);
}

.clock-number-item .rom {
  font-weight: 700;
  color: var(--accent-secondary);
}

/* FAQ Styles */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.faq-question {
  color: var(--accent-secondary);
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
}

.faq-answer {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* How-To / Rules Styles */
.how-to-section {
  margin-bottom: var(--space-2xl);
}

.how-to-section h2 {
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.symbols-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.symbol-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
}

.symbol-card .symbol {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent-secondary);
  margin-bottom: var(--space-sm);
}

.symbol-card .value {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.rule-card {
  padding: var(--space-lg);
  background: var(--bg-tertiary);
  border-left: 4px solid var(--accent-primary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  margin-bottom: var(--space-md);
}

.rule-card h3 {
  color: var(--accent-secondary);
  margin-bottom: var(--space-sm);
}

.rule-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-md);
}

.example-card {
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
}

.example-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.example-equals {
  color: var(--text-muted);
  margin: var(--space-xs) 0;
}

.example-roman {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-secondary);
}

.example-explanation {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-sm);
}

.cta-section {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.cta-button {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  background: var(--accent-gradient);
  color: white;
  border-radius: var(--radius-lg);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.cta-button:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* Popular Numbers Grid */
.popular-numbers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-md);
}

.popular-number-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-fast);
}

.popular-number-card:hover {
  border-color: var(--accent-primary);
  background: var(--bg-hover);
}

.pop-number {
  font-size: 1rem;
  color: var(--text-muted);
}

.pop-equals {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.pop-roman {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-secondary);
  margin-bottom: var(--space-sm);
}

/* Historical Dates */
.historical-section {
  margin-bottom: var(--space-2xl);
}

.historical-section h2 {
  margin-bottom: var(--space-lg);
}

.historical-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.historical-card {
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
}

.hist-year {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.hist-roman {
  font-size: 1.25rem;
  color: var(--accent-secondary);
  font-weight: 600;
  margin: var(--space-sm) 0;
}

.hist-event {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ========================================
   EDUCATIONAL CONTENT SECTIONS
   ======================================== */

.content-section {
  margin: var(--space-2xl) 0;
  padding: var(--space-xl);
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
}

.content-section h2 {
  font-size: 1.75rem;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.content-text {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* Rules Grid */
.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.rule-card {
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

.rule-card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.rule-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Uses Grid */
.uses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-md);
}

.use-card {
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.use-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.use-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: var(--space-xs);
}

.use-card h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Reference Table */
.reference-table-wrapper {
  overflow-x: auto;
}

.reference-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1rem;
}

.reference-table th,
.reference-table td {
  padding: var(--space-sm) var(--space-md);
  text-align: center;
  border: 1px solid var(--border-color);
}

.reference-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

.reference-table td {
  background: var(--bg-card);
}

.roman-cell {
  font-weight: 700;
  color: var(--accent-secondary);
  font-size: 1.125rem;
}

/* Key Numbers Grid */
.key-numbers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: var(--space-md);
}

.key-number-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md);
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  transition: all var(--transition-fast);
}

.key-number-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.15);
}

.key-arabic {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.key-equals {
  color: var(--text-muted);
  margin: var(--space-xs) 0;
}

.key-roman {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-secondary);
  font-family: var(--font-mono);
}

/* Steps List */
.steps-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.step-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
}

.step-number {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--accent-primary);
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  border-radius: 50%;
}

.step-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.step-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

/* Examples Grid */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
}

.example-card {
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-card));
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  text-align: center;
}

.example-problem {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.example-solution {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-secondary);
  font-family: var(--font-mono);
  margin-bottom: var(--space-sm);
}

.example-explanation {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Fun Facts List */
.fun-facts-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.fun-fact-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--accent-primary);
}

.fact-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.fun-fact-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.superbowl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md);
}

.superbowl-card {
  padding: var(--space-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
}

.sb-name {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sb-year {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.sb-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-secondary);
}

/* ========================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ======================================== */

/* Tablet and below - 1024px */
@media (max-width: 1024px) {
  :root {
    --container-padding: 1.5rem;
  }

  .page-container {
    padding: var(--space-lg) var(--container-padding);
  }

  .home-hero h1 {
    font-size: 3rem;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile landscape and tablet portrait - 768px */
@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }

  /* Navigation - Hide desktop, show mobile */
  .desktop-nav {
    display: none !important;
  }

  .mobile-menu-btn {
    display: flex !important;
  }

  /* Typography scaling */
  .home-hero h1 {
    font-size: 2.5rem;
    line-height: 1.1;
  }

  .home-hero p {
    font-size: 1rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  /* Layout adjustments */
  .features-grid,
  .tools-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .number-table {
    font-size: 0.875rem;
  }

  .converter-modes {
    flex-wrap: wrap;
  }

  /* Spacing reductions */
  .page-container {
    padding: var(--space-md) var(--container-padding);
  }

  section {
    padding: var(--space-xl) 0;
  }
}

/* Mobile portrait - 480px */
@media (max-width: 480px) {
  :root {
    --container-padding: 0.75rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }

  /* Hero section */
  .home-hero h1 {
    font-size: 1.75rem;
    line-height: 1.1;
    word-break: break-word;
    max-width: 100%;
  }

  .home-hero p {
    font-size: 0.9rem;
  }

  /* Navigation */
  .nav-logo {
    font-size: 1.25rem;
  }

  /* Typography */
  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  body {
    font-size: 0.9375rem;
  }

  /* Buttons */
  .btn,
  .convert-button {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
  }

  /* Cards */
  .feature-card,
  .tool-card {
    padding: var(--space-md);
  }

  /* Tables */
  .number-table td,
  .number-table th {
    padding: 0.5rem;
    font-size: 0.8125rem;
  }

  /* Forms */
  .converter-input,
  .converter-textarea {
    font-size: 1rem;
    /* Prevent zoom on iOS */
  }

  /* Grids */
  .quick-ranges {
    grid-template-columns: 1fr 1fr;
  }

  /* PDF Tab - Stack inputs vertically */
  .input-group.range-inputs,
  .pdf-range-inputs {
    display: flex !important;
    flex-direction: column !important;
    gap: var(--space-md);
  }

  .range-input,
  .pdf-input-group {
    width: 100% !important;
  }

  /* Column selector - stack vertically */
  .pdf-input-group>div[style*="flex"] {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 0.5rem !important;
  }

  /* Quick presets - wrap properly */
  .pdf-quick-presets,
  .quick-range-btn {
    flex-wrap: wrap;
  }
}

/* Small mobile - 360px */
@media (max-width: 360px) {
  .home-hero h1 {
    font-size: 1.5rem;
    word-break: break-word;
  }

  .nav-logo {
    font-size: 1.1rem;
  }

  .quick-ranges {
    grid-template-columns: 1fr;
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {

  /* Larger touch targets */
  .nav-link,
  .lang-button,
  button,
  .btn {
    min-height: 44px;
    /* iOS recommended touch target */
    padding: 0.75rem 1rem;
  }

  /* Remove hover effects that don't work on touch */
  .nav-link:hover,
  .btn:hover {
    transform: none;
  }
}

/* Print styles */
@media print {

  .main-nav,
  .site-footer,
  .pdf-generator,
  .copy-button {
    display: none !important;
  }

  .page-container {
    max-width: 100%;
  }

  .number-table {
    page-break-inside: avoid;
  }
}

/* Responsive adjustments for new features */
@media (max-width: 768px) {
  .symbols-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .clock-numbers-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }

  .level-buttons {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (max-width: 480px) {
  .symbols-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .roman-large {
    font-size: 2rem;
  }

  .quiz-question h3 {
    font-size: 1.5rem;
  }
}

/* Internal Links Section */
.internal-links-section h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.internal-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.internal-link-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s ease;
}

.internal-link-card:hover {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--bg-card), var(--bg-secondary));
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.link-emoji {
  font-size: 1.5rem;
}

.link-title {
  font-weight: 500;
  font-size: 0.9375rem;
}

.popular-links-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.popular-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  min-height: 40px;
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  color: #ffffff !important;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all 0.2s ease;
  white-space: nowrap;
  border: 2px solid transparent;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.popular-link:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.5);
  border-color: rgba(255, 255, 255, 0.3);
  background: linear-gradient(135deg, #8b5cf6, #c084fc);
}

/* Outbound links styling */
.outbound-link {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

.outbound-link:hover {
  text-decoration-style: solid;
}

.outbound-link::after {
  content: ' ↗';
  font-size: 0.75em;
  opacity: 0.7;
}

@media (max-width: 600px) {
  .internal-links-grid {
    grid-template-columns: 1fr;
  }

  .popular-links-grid {
    justify-content: center;
  }
}

/* Date Converter Styles */
.date-converter {
  max-width: 800px;
  margin: 0 auto;
}

.date-inputs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.date-select,
.date-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.date-select:focus,
.date-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-light);
}

.select-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.select-wrapper label,
.control-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.select-wrapper select,
.year-input {
  padding: var(--space-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 1.1rem;
  color: var(--text-primary);
  width: 100%;
  cursor: pointer;
}

.controls-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toggle-group {
  display: flex;
  gap: var(--space-xs);
  background: var(--bg-card);
  padding: var(--space-xs);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.toggle-btn {
  flex: 1;
  padding: var(--space-xs) var(--space-sm);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle-btn.active {
  background: var(--bg-primary);
  color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

.large-result {
  text-align: center;
  margin: var(--space-xl) 0;
  padding: var(--space-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border: 2px solid var(--border-subtle);
  position: relative;
  transition: all 0.3s ease;
}

.large-result:hover {
  border-color: var(--accent-secondary);
  box-shadow: var(--shadow-md);
}

.roman-result {
  display: block;
  font-family: 'Times New Roman', serif;
  font-size: 3.5rem;
  color: var(--accent-primary);
  margin-bottom: var(--space-md);
  word-break: break-word;
  line-height: 1.2;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  background: var(--accent-gradient);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.presets {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.preset-link {
  background: none;
  border: none;
  color: var(--text-muted);
  text-decoration: underline;
  cursor: pointer;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.preset-link:hover {
  color: var(--accent-primary);
}

@media (max-width: 600px) {
  .date-inputs {
    grid-template-columns: 1fr;
  }

  .controls-row {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .roman-result {
    font-size: 2.5rem;
  }

  .toggle-group {
    flex-wrap: wrap;
  }
}

/* Step-by-Step Visualization Styles */
.explanation-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: var(--space-md);
  width: 100%;
}

.explanation-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: var(--space-lg);
}

.explanation-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.explanation-box {
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  width: 100%;
  animation: slideDown 0.3s ease-out;
  border: 1px solid var(--border-subtle);
}

.explanation-box h4 {
  text-align: center;
  margin-bottom: var(--space-lg);
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.steps-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.step-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg-card);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  min-width: 80px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  position: relative;
}

.step-val {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.step-arrow {
  color: var(--accent-primary);
  font-size: 0.75rem;
  margin-bottom: var(--space-xs);
  opacity: 0.5;
}

.step-roman {
  font-family: 'Times New Roman', serif;
  font-weight: bold;
  font-size: 1.25rem;
  color: var(--text-primary);
}

.step-math {
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-secondary);
  padding-top: var(--space-md);
  border-top: 1px dashed var(--border-color);
  font-family: 'Times New Roman', serif;
}

.step-math strong {
  color: var(--accent-primary);
  font-size: 1.25rem;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  .steps-grid {
    gap: var(--space-sm);
  }

  .step-card {
    min-width: 60px;
    padding: var(--space-sm);
  }
}

/* Worksheet Generator Styles */
.worksheet-generator-card {
  background: var(--bg-card);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-xl);
  border: 1px solid var(--border-color);
}

.generator-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.control-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.toggle-group {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.toggle-btn {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  flex: 1;
  min-width: 100px;
  text-align: center;
}

.toggle-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
}

.toggle-btn.active {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.checkbox-group {
  margin-top: var(--space-sm);
}

.checkbox-label {
  display: flex !important;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.generate-btn {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: bold;
  font-size: 1.1rem;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  margin-top: var(--space-sm);
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.3);
}

.generate-btn:disabled {
  opacity: 0.7;
  cursor: wait;
}

/* Worksheet Generator Enhancements */
.control-row {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.input-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.text-input {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.2s;
  margin-bottom: var(--space-md);
}

.text-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px rgba(var(--accent-rgb), 0.2);
}

.toggles-row {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  .config-grid {
    grid-template-columns: 1fr;
  }

  .toggles-row {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

/* Chart Generator Styles */
.chart-generator-container {
  display: grid;
  grid-template-columns: 350px 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.chart-controls {
  background: var(--bg-secondary);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 100px;
}

.control-section {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.control-section:last-of-type {
  border-bottom: none;
}

.control-section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.select-input {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
}

/* Custom Range Inputs */
.range-inputs-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.range-input-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.range-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.number-input {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  transition: border-color 0.2s;
}

.number-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

.range-separator {
  font-size: 1.5rem;
  color: var(--text-muted);
  padding-top: 1rem;
}

/* Quick Range Buttons */
.quick-range-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.quick-range-btn {
  padding: 0.5rem 0.75rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.quick-range-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.quick-range-btn.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: white;
}

@media (max-width: 480px) {
  .range-inputs-row {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .range-separator {
    display: none;
  }

  .range-input-group {
    width: 100%;
  }

  .quick-range-buttons {
    justify-content: center;
  }
}

/* Theme Grid */
.theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.theme-btn {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s;
  font-size: 0.9rem;
}

.theme-btn:hover {
  transform: scale(1.02);
}

.theme-btn.active {
  box-shadow: 0 0 0 2px var(--accent-primary);
  transform: scale(1.05);
}

.theme-dark {
  background: #1a1a2e !important;
  color: #a78bfa !important;
  border-color: #a78bfa !important;
}

.theme-dark .theme-preview-dot {
  background: #a78bfa !important;
}

.theme-light {
  background: #f8fafc !important;
  color: #1e293b !important;
  border-color: #e2e8f0 !important;
}

.theme-light .theme-preview-dot {
  background: #7c3aed !important;
}

.theme-gold {
  background: #1c1a12 !important;
  color: #f59e0b !important;
  border-color: #f59e0b !important;
}

.theme-gold .theme-preview-dot {
  background: #f59e0b !important;
}

.theme-ocean {
  background: #0c1a2e !important;
  color: #38bdf8 !important;
  border-color: #38bdf8 !important;
}

.theme-ocean .theme-preview-dot {
  background: #38bdf8 !important;
}

.theme-forest {
  background: #0f1f0f !important;
  color: #4ade80 !important;
  border-color: #4ade80 !important;
}

.theme-forest .theme-preview-dot {
  background: #4ade80 !important;
}

.theme-sunset {
  background: #2d1810 !important;
  color: #fb923c !important;
  border-color: #fb923c !important;
}

.theme-sunset .theme-preview-dot {
  background: #fb923c !important;
}

/* Switch Slider */
.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 28px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-tertiary);
  transition: .4s;
  border: 1px solid var(--border-color);
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 4px;
  bottom: 3px;
  background-color: var(--text-secondary);
  transition: .4s;
}

input:checked+.slider {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
}

input:checked+.slider:before {
  transform: translateX(20px);
  background-color: white;
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

.download-btn-large {
  width: 100%;
  background: var(--accent-primary);
  color: white;
  padding: 1rem;
  border-radius: var(--radius-md);
  font-weight: bold;
  font-size: 1.1rem;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all 0.2s;
  margin-top: var(--space-md);
}

.download-btn-large:hover {
  background: var(--accent-secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.3);
}

.chart-preview {
  background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
  padding: var(--space-xl);
  border-radius: var(--radius-xl);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 600px;
  border: 1px solid var(--border-color);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.chart-preview canvas {
  border-radius: var(--radius-md);
  box-shadow:
    0 4px 6px rgba(0, 0, 0, 0.1),
    0 10px 30px rgba(0, 0, 0, 0.15),
    0 0 0 1px rgba(0, 0, 0, 0.05);
  max-width: 100%;
  height: auto;
  transition: transform 0.2s ease;
}

.chart-preview canvas:hover {
  transform: scale(1.01);
}

@media (max-width: 1024px) {
  .chart-generator-container {
    grid-template-columns: 1fr;
  }

  .chart-controls {
    position: static;
    order: 1;
    /* Move controls to top on mobile */
  }

  .chart-preview {
    order: 2;
    /* Move preview below controls */
    min-height: 400px;
    /* Reduce min-height for mobile */
  }
}

@media (max-width: 640px) {
  .chart-preview {
    padding: var(--space-sm);
    min-height: 250px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    align-items: center;
  }

  .chart-preview canvas {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    max-width: none;
    /* Remove max-width constraint so canvas shows at natural size */
    flex-shrink: 0;
    /* Prevent canvas from shrinking */
  }

  .control-section h3 {
    font-size: 1rem;
  }

  .download-btn-large {
    font-size: 1rem;
    padding: 0.8rem;
  }

  .theme-grid {
    grid-template-columns: 1fr;
    /* Stack theme buttons on mobile */
  }

  .control-row {
    flex-direction: column;
    gap: var(--space-md);
  }

  .chart-controls {
    padding: var(--space-md);
  }
}

/* SEO Content Styles */
.seo-content {
  margin-top: 4rem;
  padding: 0 var(--space-md);
}

.seo-content h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  margin-top: 3rem;
  color: var(--text-primary);
}

.seo-content p {
  line-height: 1.7;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.seo-content ul {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
}

.seo-content li {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.6;
}

.seo-content li::before {
  content: "•";
  color: var(--accent-primary);
  font-weight: bold;
  position: absolute;
  left: 0;
}

/* SEO Features Grid */
.seo-features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.feature-card {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: transform 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 1rem;
}

.feature-card p {
  margin-bottom: 0;
  font-size: 1rem;
}

/* Mobile responsive for SEO content */
@media (max-width: 768px) {
  .seo-content {
    margin-top: 2.5rem;
    padding: 0 var(--space-sm);
  }

  .seo-content h2 {
    font-size: 1.4rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
  }

  .seo-content p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  .seo-features-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin: 2rem 0;
  }

  .feature-card {
    padding: 1.25rem;
  }

  .feature-card h3 {
    font-size: 1.1rem;
  }

  .feature-card p {
    font-size: 0.95rem;
  }
}

@media (max-width: 480px) {
  .seo-content {
    margin-top: 2rem;
  }

  .seo-content h2 {
    font-size: 1.25rem;
  }

  .seo-content p,
  .seo-content li {
    font-size: 0.95rem;
    line-height: 1.6;
  }

  .feature-card {
    padding: 1rem;
  }
}

/* ========================================
   QUIZ & LEARNING UI
   ======================================== */

.quiz-container {
  max-width: 700px;
  margin: var(--space-xl) auto;
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
}

.quiz-progress {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.quiz-progress-bar {
  width: 200px;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  transition: width var(--transition-base);
}

.quiz-score {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.quiz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  text-align: center;
  animation: fadeIn var(--transition-base);
}

.quiz-question {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
}

.quiz-question-number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent-secondary);
  margin-bottom: var(--space-md);
}

.quiz-answers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

@media (max-width: 480px) {
  .quiz-answers {
    grid-template-columns: 1fr;
  }
}

.quiz-answer {
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quiz-answer:hover:not(.disabled) {
  border-color: var(--accent-primary);
  background: rgba(124, 58, 237, 0.1);
  transform: translateY(-2px);
}

.quiz-answer.correct {
  border-color: var(--success);
  background: rgba(34, 197, 94, 0.1);
  color: var(--success);
}

.quiz-answer.incorrect {
  border-color: var(--error);
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

.quiz-answer.disabled {
  cursor: default;
  opacity: 0.7;
}

.quiz-feedback {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  font-weight: 500;
  margin-bottom: var(--space-lg);
}

.quiz-feedback.correct {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: var(--success);
}

.quiz-feedback.incorrect {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--error);
}

.quiz-next-btn {
  padding: var(--space-md) var(--space-2xl);
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  color: white;
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.quiz-next-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.quiz-results {
  text-align: center;
  padding: var(--space-2xl);
}

.quiz-results-score {
  font-size: 4rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
}

.quiz-results-message {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {

  /* Hide non-essential elements */
  .main-nav,
  .site-footer,
  .mobile-menu-btn,
  .mobile-nav,
  .lang-selector,
  .breadcrumbs,
  .table-toolbar,
  .toolbar-buttons,
  .filter-bar,
  .load-more-container,
  .load-more-button,
  .pdf-buttons,
  .copy-button,
  .copy-all-button,
  .quiz-next-btn,
  .results-count,
  button,
  .home-cards,
  .learning-section,
  .faq-section,
  .search-box,
  .nav-links,
  .calculator-card .calc-actions,
  .content-section,
  .symbols-section,
  .rules-section,
  .uses-section,
  .reference-section,
  .internal-links-section,
  .home-hero p,
  .symbols-grid,
  .rules-grid,
  .uses-grid,
  .reference-table-wrapper,
  .internal-links-grid,
  .popular-links-grid {
    display: none !important;
  }

  /* Force color accuracy */
  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
    color-adjust: exact !important;
  }

  /* Page setup */
  @page {
    margin: 1.5cm 1.2cm;
    size: A4 portrait;
  }

  /* Reset everything for clean print */
  html,
  body {
    width: 100%;
    height: auto;
    background: white !important;
    color: #000 !important;
    font-family: 'Arial', 'Helvetica', sans-serif;
    font-size: 10pt;
    line-height: 1.4;
    margin: 0;
    padding: 0;
  }

  /* Remove all shadows and transitions */
  * {
    box-shadow: none !important;
    text-shadow: none !important;
    transition: none !important;
    animation: none !important;
    background-image: none !important;
  }

  /* Page container */
  .page-container {
    max-width: 100%;
    width: 100%;
    padding: 0 !important;
    margin: 0 !important;
  }

  /* Page header styling */
  .page-header {
    margin-bottom: 18pt;
    padding-bottom: 8pt;
    border-bottom: 2.5pt solid #000;
    page-break-after: avoid;
  }

  .page-header h1 {
    font-size: 22pt;
    font-weight: 700;
    color: #000 !important;
    background: none !important;
    -webkit-text-fill-color: #000 !important;
    margin-bottom: 4pt;
    letter-spacing: -0.3pt;
    text-transform: uppercase;
  }

  .page-intro {
    color: #333 !important;
    font-size: 10pt;
    margin-bottom: 0;
    font-style: italic;
  }

  /* Enhanced table container */
  .table-wrapper {
    border: 2pt solid #000;
    overflow: visible !important;
    page-break-inside: auto;
    margin-bottom: 12pt;
  }

  /* Table styling */
  .roman-table {
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
  }

  /* Table header */
  .roman-table thead {
    display: table-header-group;
    background: #e8e8e8 !important;
  }

  .roman-table tbody {
    display: table-row-group;
  }

  .roman-table th {
    background: #e8e8e8 !important;
    color: #000 !important;
    font-size: 10pt;
    font-weight: 700;
    padding: 8pt 10pt;
    border: 1pt solid #666;
    text-align: left;
    text-transform: uppercase;
    letter-spacing: 0.3pt;
  }

  /* Table cells */
  .roman-table td {
    padding: 6pt 10pt;
    border: 0.5pt solid #999;
    font-size: 10pt;
    vertical-align: middle;
  }

  /* Zebra striping for better readability */
  .roman-table tbody tr:nth-child(odd) {
    background: #fafafa !important;
  }

  .roman-table tbody tr:nth-child(even) {
    background: #fff !important;
  }

  /* Highlight every 10th row for easier scanning */
  .roman-table tbody tr:nth-child(10n) {
    background: #f0f0f0 !important;
    border-top: 1pt solid #666 !important;
    border-bottom: 1pt solid #666 !important;
  }

  /* Row hover removed for print */
  .roman-table tbody tr:hover {
    background: inherit !important;
  }

  /* Page break management */
  .roman-table tr {
    page-break-inside: avoid;
    page-break-after: auto;
  }

  /* Prevent orphaned header */
  .roman-table thead tr {
    page-break-after: avoid;
  }

  /* Number cell */
  .number-cell {
    color: #000 !important;
    font-weight: 700;
    font-size: 10pt;
    width: 25%;
  }

  /* Roman numeral cell */
  .roman-cell {
    color: #000 !important;
    font-weight: 700;
    font-size: 11pt;
    font-family: 'Courier New', 'Courier', monospace;
    letter-spacing: 0.5pt;
    width: 70%;
  }

  /* Hide copy column */
  .copy-cell {
    display: none !important;
  }

  /* Hide mobile view, show desktop table */
  .mobile-cards {
    display: none !important;
  }

  .desktop-table {
    display: block !important;
  }

  /* Calculator print styles */
  .calculator-container {
    page-break-inside: avoid;
    margin-bottom: 15pt;
  }

  .calculator-card,
  .calc-result-card,
  .calc-steps-card {
    border: 1.5pt solid #666;
    padding: 12pt;
    margin-bottom: 12pt;
    page-break-inside: avoid;
    background: #fafafa !important;
  }

  .calc-label {
    font-weight: 700;
    font-size: 9pt;
    color: #000 !important;
    text-transform: uppercase;
    letter-spacing: 0.3pt;
  }

  .calc-input,
  .roman-preview {
    border: 1pt solid #999;
    padding: 6pt;
    background: #fff !important;
    color: #000 !important;
    font-size: 11pt;
  }

  .result-value {
    font-size: 16pt !important;
    font-weight: 700;
    color: #000 !important;
  }

  .calc-step {
    padding: 6pt;
    border-left: 3pt solid #ccc;
    margin-bottom: 4pt;
    background: #f9f9f9 !important;
  }

  /* Section titles */
  h2,
  h3,
  h4 {
    color: #000 !important;
    page-break-after: avoid;
  }

  h2 {
    font-size: 16pt;
    font-weight: 700;
    margin-top: 16pt;
    margin-bottom: 10pt;
    border-bottom: 1.5pt solid #999;
    padding-bottom: 4pt;
  }

  h3 {
    font-size: 13pt;
    font-weight: 700;
    margin-top: 12pt;
    margin-bottom: 8pt;
  }

  h4 {
    font-size: 11pt;
    font-weight: 700;
    margin-bottom: 6pt;
  }

  /* Page breaks for sections */
  .guide-section,
  .learning-block,
  .faq-item {
    page-break-inside: avoid;
  }

  /* Links */
  a {
    color: #000 !important;
    text-decoration: none !important;
  }

  /* Add document info footer using CSS */
  .page-container::after {
    content: "";
    display: block;
    margin-top: 20pt;
    padding-top: 10pt;
    border-top: 1pt solid #ccc;
    font-size: 8pt;
    color: #666;
    text-align: center;
  }

  /* Print-specific utility classes */
  .page-break {
    page-break-after: always;
  }

  .avoid-break {
    page-break-inside: avoid;
  }

  /* Improve contrast for better readability */
  strong,
  b {
    font-weight: 700;
    color: #000;
  }

  em,
  i {
    font-style: italic;
  }

  /* Subtractive highlighting for print */
  .subtractive-row {
    background: rgba(251, 191, 36, 0.15) !important;
    border-left: 2pt solid #d97706 !important;
    border-right: 2pt solid #d97706 !important;
  }

  .subtractive-highlight {
    color: #d97706 !important;
    font-weight: 900 !important;
  }

  .subtractive-card {
    border: 2pt solid #d97706 !important;
    background: rgba(251, 191, 36, 0.15) !important;
  }
}

/* ========================================
   DARK MODE (Optional - Class-based)
   ======================================== */

.dark {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #252540;
  --bg-card: #1a1a2e;
  --bg-hover: #2a2a45;

  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b5;
  --text-muted: #707085;

  --border-color: #2a2a45;
  --border-subtle: #252540;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.dark body {
  color-scheme: dark;
}

.dark .main-nav {
  background: rgba(15, 15, 26, 0.95);
}

.dark .roman-table th {
  background: var(--bg-tertiary);
}

.dark .roman-table tbody tr:hover {
  background: var(--bg-hover);
}

.dark .home-card:hover {
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.2);
}

/* ========================================
   CALCULATOR STYLES
   ======================================== */

.calculator-container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

/* Calculator Card */
.calculator-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.98) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.calculator-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

/* Input Groups */
.calculator-inputs {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.calc-input-group {
  position: relative;
}

.calc-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.input-wrapper {
  position: relative;
}

.calc-input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--text-primary);
  background: white;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  outline: none;
}

.calc-input:hover {
  border-color: var(--accent-secondary);
}

.calc-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.calc-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
}

/* Roman Preview */
.roman-preview {
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  padding: var(--space-xs) var(--space-md);
  background: var(--accent-gradient);
  color: white;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  letter-spacing: 1px;
  box-shadow: 0 2px 8px rgba(124, 58, 237, 0.3);
  animation: slideIn 0.3s ease;
  pointer-events: none;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-50%) translateX(10px);
  }

  to {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }
}

/* Operation Selector */
.calc-operation {
  text-align: center;
}

.operation-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.op-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  background: white;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.op-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.op-btn:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.op-btn.active {
  border-color: var(--accent-primary);
  color: white;
}

.op-btn.active::before {
  opacity: 1;
}

.op-symbol,
.op-label {
  position: relative;
  z-index: 1;
}

.op-symbol {
  font-size: 1.75rem;
  line-height: 1;
}

.op-label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: capitalize;
}

.op-btn.active .op-label,
.op-btn.active .op-symbol {
  color: white;
}

/* Action Buttons */
.calc-actions {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.calc-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  outline: none;
  position: relative;
  overflow: hidden;
}

.calc-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.calc-btn:hover::before {
  opacity: 1;
}

.calc-btn.primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.calc-btn.primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(124, 58, 237, 0.4);
}

.calc-btn.primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.calc-btn.secondary {
  background: white;
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
}

.calc-btn.secondary:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.btn-icon {
  font-size: 1.25rem;
  line-height: 1;
}

/* Result Card */
.calc-result-card {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-glow);
  animation: resultAppear 0.4s ease;
}

@keyframes resultAppear {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }

  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.result-header {
  margin-bottom: var(--space-md);
}

.result-badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  background: rgba(255, 255, 255, 0.2);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: var(--radius-full);
  backdrop-filter: blur(10px);
}

.result-display {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.result-value {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex: 1;
}

.result-arabic,
.result-roman {
  font-size: 2rem;
  font-weight: 700;
  color: white;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.result-roman {
  letter-spacing: 2px;
}

.result-equals {
  font-size: 1.5rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
}

/* Steps Card */
.calc-steps-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.98) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  animation: resultAppear 0.4s ease 0.1s both;
}

.steps-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.steps-icon {
  font-size: 1.5rem;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.calc-step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background: white;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.calc-step:hover {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  min-width: 28px;
  background: var(--accent-gradient);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-top: 2px;
}

/* Responsive Design */
@media (max-width: 640px) {
  .calculator-card {
    padding: var(--space-lg);
  }

  .operation-buttons {
    grid-template-columns: repeat(2, 1fr);
  }

  .calc-actions {
    grid-template-columns: 1fr;
  }

  .result-arabic,
  .result-roman {
    font-size: 1.5rem;
  }

  .result-display {
    flex-direction: column;
    align-items: flex-start;
  }

  .op-symbol {
    font-size: 1.5rem;
  }

  .op-label {
    font-size: 0.7rem;
  }
}


/* Respect user preference for reduced motion */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================
   ACCESSIBILITY ENHANCEMENTS
   ======================================== */

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-primary);
  color: white;
  border-radius: var(--radius-md);
  z-index: 1000;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-md);
}

/* ========================================
   ADDITIONAL STATIC SITE STYLES
   ======================================== */

/* Toast notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  animation: slideInRight 0.3s ease;
}
@keyframes slideInRight {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}
.toast {
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.toast-success {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--success);
}
.toast-error {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--error);
}

/* Homepage hero */
.hero-section {
  text-align: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
}
.hero-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  line-height: 1.2;
  color: var(--text-primary);
}
.hero-accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}
.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}
.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-fast);
  text-decoration: none;
}
.cta-button.primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: var(--shadow-glow);
}
.cta-button.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(124,58,237,0.4);
}
.cta-button.secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}
.cta-button.secondary:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

/* Homepage sections */
.homepage { padding-bottom: 0; }
.lists-section, .tools-section, .educational-links { margin: var(--space-3xl) 0; }
.section-title { font-size: 1.75rem; font-weight: 700; margin-bottom: var(--space-md); color: var(--text-primary); }
.section-intro { color: var(--text-secondary); margin-bottom: var(--space-xl); }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
}
.feature-card {
  display: block;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-base);
}
.feature-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: var(--space-xs); }
.feature-card p { font-size: 0.875rem; color: var(--text-secondary); }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-md);
}
.tool-card {
  display: block;
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: center;
  text-decoration: none;
  color: var(--text-primary);
  transition: all var(--transition-base);
}
.tool-card:hover { border-color: var(--accent-primary); transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.tool-icon { font-size: 2rem; display: block; margin-bottom: var(--space-sm); }
.tool-card h3 { font-size: 0.9375rem; font-weight: 600; margin-bottom: var(--space-xs); }
.tool-card p { font-size: 0.8125rem; color: var(--text-secondary); }

.edu-links-grid { display: flex; gap: var(--space-md); flex-wrap: wrap; }
.edu-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: all var(--transition-fast);
}
.edu-link:hover { border-color: var(--accent-primary); transform: translateY(-2px); }
.edu-emoji { font-size: 1.25rem; }

/* Converter card */
.converter-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
}
.converter-header { text-align: center; margin-bottom: var(--space-xl); }
.converter-header h2 { font-size: 1.75rem; font-weight: 800; color: var(--text-primary); margin-bottom: var(--space-sm); }
.converter-header p { color: var(--text-secondary); }

/* Dark mode calculator */
[data-theme="dark"] .calculator-card,
[data-theme="dark"] .calc-steps-card { background: var(--bg-card); }
[data-theme="dark"] .calc-input,
[data-theme="dark"] .op-btn { background: var(--bg-secondary); }
[data-theme="dark"] .calc-step { background: var(--bg-secondary); }
[data-theme="dark"] .calc-btn.secondary { background: var(--bg-secondary); }

/* lang-menu hidden by default */
#lang-menu { display: none; }

/* Symbol card elements */
.roman-large { font-size: 2.5rem; font-weight: 800; color: var(--accent-secondary); font-family: var(--font-mono); }
.arabic-value { font-size: 0.9rem; color: var(--text-muted); margin-top: 0.25rem; }

/* About page */
.about-content { max-width: 800px; margin: 0 auto; }
.about-content h2 { font-size: 1.5rem; font-weight: 700; margin: var(--space-2xl) 0 var(--space-md); color: var(--text-primary); }
.about-content p { color: var(--text-secondary); line-height: 1.8; margin-bottom: var(--space-md); }
.about-content ul { list-style: disc; padding-left: var(--space-xl); color: var(--text-secondary); margin-bottom: var(--space-md); }
.about-content li { margin-bottom: var(--space-sm); }

/* ============================================
   CHART GENERATOR - ENHANCED STYLES
   ============================================ */

/* Control Section Descriptions */
.control-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

/* Theme Preview Dots */
.theme-preview-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}

/* Preview Header */
.preview-header {
  text-align: center;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: 12px 12px 0 0;
  border-bottom: 2px solid var(--border-color);
}

.preview-header h3 {
  margin: 0 0 0.5rem;
  color: var(--heading-color);
  font-size: 1.25rem;
}

.preview-header p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Download Info */
.download-info {
  font-size: 0.813rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 0.75rem;
  line-height: 1.5;
}

/* Features Section */
.features-section {
  margin: 4rem 0;
  padding: 3rem 0;
  background: var(--section-bg);
  border-radius: 16px;
}

.features-section h2 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2rem;
  color: var(--heading-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  padding: 0 2rem;
}

.feature-card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.feature-icon {
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.feature-card h3 {
  margin: 0 0 1rem;
  font-size: 1.25rem;
  color: var(--heading-color);
}

.feature-card p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* How To Section */
.howto-section {
  margin: 4rem 0;
}

.howto-section h2 {
  text-align: center;
  margin-bottom: 3rem;
  font-size: 2rem;
  color: var(--heading-color);
}

.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.step-card {
  position: relative;
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  border: 2px solid var(--border-color);
}

.step-number {
  position: absolute;
  top: -1rem;
  left: 2rem;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--primary-color);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.25rem;
}

.step-card h3 {
  margin: 1rem 0 1rem;
  font-size: 1.125rem;
  color: var(--heading-color);
}

.step-card p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Educational Content */
.educational-content {
  margin: 4rem 0;
}

.content-block {
  margin-bottom: 3rem;
  padding: 2rem;
  background: var(--card-bg);
  border-radius: 12px;
  border-left: 4px solid var(--primary-color);
}

.content-block h2 {
  margin-top: 0;
  margin-bottom: 1.5rem;
  color: var(--heading-color);
  font-size: 1.75rem;
}

.content-block p {
  margin-bottom: 1rem;
  line-height: 1.7;
  color: var(--text-color);
}

.benefit-list,
.pattern-list {
  margin: 1.5rem 0;
  padding-left: 1.5rem;
}

.benefit-list li,
.pattern-list li {
  margin-bottom: 1rem;
  line-height: 1.6;
  color: var(--text-color);
}

.benefit-list strong,
.pattern-list strong {
  color: var(--primary-color);
}

/* Uses Grid */
.uses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.use-card {
  padding: 1.5rem;
  background: var(--bg-color);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.use-card h4 {
  margin: 0 0 0.75rem;
  color: var(--heading-color);
  font-size: 1.125rem;
}

.use-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.938rem;
  line-height: 1.6;
}

/* Tips List */
.tips-list {
  margin-top: 1.5rem;
}

.tip-item {
  padding: 1rem;
  margin-bottom: 1rem;
  background: var(--bg-color);
  border-left: 3px solid var(--primary-color);
  border-radius: 4px;
  line-height: 1.6;
}

.tip-item strong {
  color: var(--primary-color);
  display: block;
  margin-bottom: 0.25rem;
}

/* FAQ */
.faq-container {
  margin-top: 2rem;
}

.faq-item {
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-color);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.faq-item h3 {
  margin: 0 0 1rem;
  color: var(--heading-color);
  font-size: 1.125rem;
  font-weight: 600;
}

.faq-item p {
  margin: 0;
  line-height: 1.6;
  color: var(--text-color);
}

/* Related Resources */
.related-resources {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.resource-link {
  display: block;
  padding: 1.25rem;
  background: var(--bg-color);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.resource-link:hover {
  border-color: var(--primary-color);
  background: var(--card-bg);
  transform: translateX(4px);
}

.resource-link strong {
  display: block;
  color: var(--heading-color);
  margin-bottom: 0.25rem;
  font-size: 1.063rem;
}

.resource-link span {
  display: block;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* CTA Section */
.cta-section {
  text-align: center;
  padding: 4rem 2rem;
  margin: 4rem 0;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  border-radius: 16px;
  color: white;
}

.cta-section h2 {
  margin: 0 0 1rem;
  color: white;
  font-size: 2rem;
}

.cta-section p {
  margin: 0 0 2rem;
  font-size: 1.125rem;
  opacity: 0.9;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: white;
  color: var(--primary-color);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 1.125rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

/* Responsive */
@media (max-width: 768px) {
  .features-grid,
  .steps-container,
  .uses-grid {
    grid-template-columns: 1fr;
  }
  
  .features-section h2,
  .howto-section h2 {
    font-size: 1.5rem;
  }
  
  .cta-section h2 {
    font-size: 1.5rem;
  }
  
  .cta-section {
    padding: 2rem 1rem;
  }
}

/* Add to style.css */

/* Fix theme buttons - NO transform/zoom */
.theme-btn {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: box-shadow 0.2s ease, opacity 0.2s ease;
  font-size: 0.875rem;
  /* REMOVE transform - causes nav hide issue */
  transform: none !important;
}

.theme-btn:hover {
  opacity: 0.9;
  /* NO transform here */
}

.theme-btn.active {
  box-shadow: 0 0 0 3px var(--accent-primary);
  /* NO transform/scale */
}

/* Ensure chart controls stay in proper stacking context */
.chart-controls {
  position: relative;
  z-index: 1; /* Lower than nav z-index:100 */
}

/* Ensure theme grid doesn't overflow */
.theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
  position: relative;
  z-index: 1;
}
/* ========================================
   QUICK CONVERTER WIDGET
   ======================================== */

.quick-converter-widget {
  padding: var(--space-3xl) var(--container-padding);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  margin: var(--space-2xl) auto;
  max-width: 800px;
  text-align: center;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

.quick-converter-box {
  background: var(--bg-card);
  padding: var(--space-2xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  margin-top: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  align-items: center;
  box-shadow: var(--shadow-sm);
}

.quick-converter-input {
  width: 100%;
  max-width: 300px;
  padding: var(--space-md) var(--space-lg);
  font-size: 1.25rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  text-align: center;
  transition: all var(--transition-base);
  outline: none;
}

.quick-converter-input:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.quick-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  width: 100%;
  min-height: 120px;
  justify-content: center;
}

.quick-result-label {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
}

.quick-output {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1;
  word-break: break-all;
}

.quick-copy-btn {
  margin-top: var(--space-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.quick-copy-btn:hover {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
  transform: translateY(-1px);
}

.quick-copy-btn svg {
  width: 18px;
  height: 18px;
}

.help-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

[data-theme='dark'] .quick-converter-widget {
  background: rgba(30, 41, 59, 0.5);
}

[data-theme='dark'] .quick-result {
  background: rgba(15, 23, 42, 0.5);
}

/* ========================================
   PRINT OPTIMIZATION
   ======================================== */

@media print {
  /* Hide UI elements that shouldn't be printed */
  .main-nav,
  .site-footer,
  .table-toolbar,
  .filter-bar,
  .breadcrumbs,
  .skip-link,
  .copy-button,
  .theme-toggle,
  .mobile-menu-btn,
  .mobile-nav,
  .related-tools,
  .quick-converter-widget {
    display: none !important;
  }

  /* Reset layout for white background */
  body {
    background: #fff !important;
    color: #000 !important;
    padding: 0 !important;
    margin: 0 !important;
  }

  .page-container {
    max-width: 100% !important;
    padding: 0 !important;
    box-shadow: none !important;
  }

  /* Ensure the table takes full width and is clear */
  .roman-table {
    width: 100% !important;
    border-collapse: collapse !important;
    font-size: 10pt !important;
  }

  .roman-table th, 
  .roman-table td {
    border: 1px solid #ddd !important;
    padding: 8px !important;
  }

  .roman-table th {
    background: #f0f0f0 !important;
    -webkit-print-color-adjust: exact;
  }

  /* Keep the page header but clean it up */
  .page-header {
    text-align: center !important;
    margin-bottom: 2rem !important;
  }

  .page-header h1 {
    font-size: 18pt !important;
    color: #000 !important;
  }

  .page-intro {
    font-size: 11pt !important;
  }

  /* Hide the copy-cell in print */
  .copy-cell {
    display: none !important;
  }

  /* Hide mobile-only elements */
  .mobile-cards {
    display: none !important;
  }

  /* Force desktop table layout in print even on mobile */
  .desktop-table {
    display: block !important;
  }
}

/* ========================================
   PRINT STYLES (PDF OPTIMIZATION)
   ======================================== */
@media print {
  /* Hide non-essential elements */
  nav.main-nav,
  header.hero-section,
  .breadcrumbs,
  .table-toolbar,
  .filter-bar,
  .results-count,
  .seo-content,
  .related-tools,
  footer.site-footer,
  .skip-link,
  .mobile-menu-btn,
  .theme-toggle,
  .quick-converter-widget,
  #hamburger-btn,
  aside {
    display: none !important;
  }

  /* Reset layout for print */
  body, 
  .page-container, 
  main {
    margin: 0 !important;
    padding: 0 !important;
    background: #fff !important;
    color: #000 !important;
    display: block !important;
  }

  .roman-table-container {
    margin: 0 !important;
    padding: 0 !important;
  }

  .page-header {
    margin-bottom: 20px !important;
    text-align: center !important;
  }

  h1 {
    font-size: 24pt !important;
    color: #000 !important;
    margin: 0 !important;
  }

  /* Optimize Table */
  .table-wrapper {
    overflow: visible !important;
    max-height: none !important;
  }

  .roman-table {
    width: 100% !important;
    border-collapse: collapse !important;
    font-size: 10pt !important;
    margin: 0 !important;
  }

  .roman-table th,
  .roman-table td {
    border: 1px solid #ddd !important;
    padding: 8px !important;
    color: #000 !important;
  }

  .roman-table th {
    background-color: #f2f2f2 !important;
    -webkit-print-color-adjust: exact;
  }

  /* Hide copy buttons in table during print */
  .copy-cell,
  .copy-button {
    display: none !important;
  }

  /* Page breaks */
  tr { page-break-inside: avoid; }
  thead { display: table-header-group; }
}

/* ========================================
   PREMIUM TYPOGRAPHY & HEADINGS
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 8vw, 3.5rem);
  margin-bottom: var(--space-md);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.page-header h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  text-align: center;
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  display: block;
  width: 40px;
  height: 4px;
  background: var(--accent-primary);
  border-radius: var(--radius-full);
  margin-top: var(--space-xs);
}

.section-title {
  display: block;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.section-title::after {
  margin-left: auto;
  margin-right: auto;
}

h3 {
  font-size: 1.5rem;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  color: var(--accent-primary);
}

.page-intro {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto var(--space-2xl);
  text-align: center;
  line-height: 1.6;
}

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Featured Article Boxes */
.pattern-box {
  background: var(--bg-secondary);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--accent-primary);
  margin-bottom: var(--space-md);
}

.pattern-box h4 {
  color: var(--accent-primary);
  margin-bottom: var(--space-xs);
}

/* --- TABLE INTERACTION --- */
table td { cursor: pointer; transition: background 0.2s ease; position: relative; }
table td:hover { background: rgba(124, 58, 237, 0.1); }
table td:hover::after { content: "Click to Copy"; position: absolute; top: -25px; left: 50%; transform: translateX(-50%); background: var(--bg-surface); border: 1px solid var(--border-subtle); padding: 2px 8px; font-size: 10px; border-radius: 4px; z-index: 10; font-weight: bold; pointer-events: none; }

/* Simple Breadcrumbs Style */
.simple-breadcrumbs { margin-bottom: 20px; font-size: 14px; color: #666; }
.simple-breadcrumbs a { color: var(--accent-primary); text-decoration: none; }
.simple-breadcrumbs a:hover { text-decoration: underline; }
.simple-breadcrumbs span { color: #888; }

/* --- LANGUAGE HUB SECTION --- */
.language-hub-section { padding: 4rem 0; background: var(--bg-secondary); border-top: 1px solid var(--border-color); }
.hub-title { text-align: center; font-size: 2rem; margin-bottom: 0.5rem; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; font-weight: 800; }
.hub-subtitle { text-align: center; color: var(--text-secondary); margin-bottom: 3rem; }
.language-hub-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 1rem; }
.lang-hub-card { display: flex; flex-direction: column; align-items: center; padding: 1.25rem; background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-lg); text-decoration: none; transition: all 0.3s ease; }
.lang-hub-card:hover { transform: translateY(-5px); border-color: var(--accent-primary); box-shadow: var(--shadow-md); }
.hub-flag { font-size: 1.5rem; margin-bottom: 0.5rem; }
.hub-cd { font-weight: 800; color: var(--text-primary); font-size: 0.8rem; letter-spacing: 0.1em; margin-bottom: 0.25rem; }
.hub-name { font-size: 0.9rem; color: var(--text-secondary); }

@media (max-width: 640px) {
    .language-hub-grid { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
    .lang-hub-card { padding: 0.75rem; }
}