/* CSS Custom Properties - single source of truth for fonts, colors, and dimensions */
:root {
  /* Layout dimensions */
  --top-bar-height: 56px;
  --bottom-nav-height: 64px;

  /* Font families */
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Font sizes */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.5rem;
  --font-size-xl: 1.5rem;

  /* Component-specific font sizes */
  --verse-number-size-inline: 0.5em;
  --verse-number-size-block: 0.875em;
  --book-hebrew-size: var(--font-size-xl);
  --book-english-size: var(--font-size-sm);
  --category-title-size: var(--font-size-base);

  /* Colors - Primary blue */
  --color-blue-50: #eff6ff;
  --color-blue-100: #dbeafe;
  --color-blue-200: #3b82f6;
  --color-blue-400: #1e40af;
  --color-blue-500: #2563eb;
  --color-blue-600: #1e3a8a;
  --color-blue-700: #1d4ed8;

  /* Colors - Purple accent */
  --color-purple-50: #f3f0ff;
  --color-purple-500: #8b5cf6;

  /* Colors - Gray scale */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;

  /* Colors - Semantic */
  --color-text-primary: #1a1a1a;
  --color-text-secondary: var(--color-gray-600);
  --color-text-inverse: #ffffff;
  --color-text-error: #dc2626;

  /* Category colors for books */
  --category-torah: var(--color-blue-600);          /* Blue */
  --category-nevi_im: var(--color-purple-500);      /* Purple */
  --category-ketuvim: var(--color-gray-600);        /* Gray */
  --category-gospels: #16a34a;                      /* Green */
  --category-pauline-epistles: #ea580c;             /* Orange */
  --category-general-epistles: #0d9488;             /* Teal */
  --category-apocalyptic: #dc2626;                  /* Red */

  --color-bg-body: #f5f5f5;
  --color-bg-card: #ffffff;
  --color-bg-hover: var(--color-gray-100);

  --color-border: var(--color-gray-300);
  --color-border-light: var(--color-gray-200);

  /* Gradients */
  --gradient-primary: linear-gradient(90deg, var(--color-blue-200) 0%, var(--color-purple-500) 100%);
  --gradient-card: linear-gradient(135deg, #ffffff 0%, var(--color-gray-100) 100%);
  --gradient-card-hover: linear-gradient(135deg, var(--color-blue-50) 0%, var(--color-blue-100) 100%);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.05);
  --shadow-lg: 0 -2px 8px rgba(0,0,0,0.05);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-card-hover: 0 12px 24px rgba(59, 130, 246, 0.15), 0 6px 12px rgba(59, 130, 246, 0.1);
  --shadow-card-active: 0 6px 12px rgba(59, 130, 246, 0.1), 0 3px 6px rgba(59, 130, 246, 0.08);
}

/* Dark theme overrides */
[data-theme="dark"] {
  --color-blue-50: #1e3a8a;
  --color-blue-100: #1e40af;
  --color-blue-200: #3b82f6;
  --color-blue-400: #60a5fa;
  --color-blue-500: #3b82f6;
  --color-blue-600: #2563eb;
  --color-blue-700: #1d4ed8;

  --color-purple-50: #5b21b6;
  --color-purple-500: #a78bfa;

  --color-gray-50: #1f2937;
  --color-gray-100: #374151;
  --color-gray-200: #4b5563;
  --color-gray-300: #6b7280;
  --color-gray-400: #9ca3af;
  --color-gray-500: #d1d5db;
  --color-gray-600: #e5e7eb;
  --color-gray-700: #f3f4f6;

  --color-text-primary: #f9fafb;
  --color-text-secondary: var(--color-gray-400);
  --color-text-inverse: #1a1a1a;

  --category-torah: #60a5fa;
  --category-nevi_im: #a78bfa;
  --category-ketuvim: #9ca3af;
  --category-gospels: #22c55e;
  --category-pauline-epistles: #f97316;
  --category-general-epistles: #14b8a6;
  --category-apocalyptic: #ef4444;

  --color-bg-body: #111827;
  --color-bg-card: #1f2937;
  --color-bg-hover: var(--color-gray-100);

  --color-border: var(--color-gray-200);
  --color-border-light: var(--color-gray-100);

  --gradient-primary: linear-gradient(90deg, var(--color-blue-200) 0%, var(--color-purple-500) 100%);
  --gradient-card: linear-gradient(135deg, #1f2937 0%, #374151 100%);
  --gradient-card-hover: linear-gradient(135deg, #1e3a8a 0%, #1e40af 100%);

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-lg: 0 -2px 8px rgba(0,0,0,0.3);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-card-hover: 0 12px 24px rgba(96, 165, 250, 0.2), 0 6px 12px rgba(96, 165, 250, 0.15);
  --shadow-card-active: 0 6px 12px rgba(96, 165, 250, 0.15), 0 3px 6px rgba(96, 165, 250, 0.1);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--font-serif);
  line-height: 1.7;
  color: var(--color-text-primary);
  background: var(--color-bg-body);
  overflow-x: hidden;
}

/* Top bar - fixed at top, constrained width, centered */
body > top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  max-width: 540px;
  margin: 0 auto;
  z-index: 100;
}

/* Main content - constrained width, centered, below top bar */
body > main {
  display: block;
  max-width: 540px;
  margin: 0 auto;
  background: var(--color-bg-card);
  min-height: 100vh;
  padding: var(--top-bar-height) 1.5rem 0;
}

/* Navigation buttons at bottom */
body > nav.chapter-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 540px;
  margin: 0 auto;
  height: var(--bottom-nav-height);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

.chapter-nav a {
  flex: 1;
  padding: 0.75rem 0.875rem;
  text-align: center;
  text-decoration: none;
  color: var(--color-blue-400);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg-card);
  font-size: clamp(var(--font-size-xs), 2.5vw, var(--font-size-base));
  font-weight: 500;
  transition: all 0.2s ease;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.chapter-nav a:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-gray-400);
  transform: translateY(-1px);
}

.chapter-nav a:active {
  transform: translateY(0);
}

/* Chapter view - with bottom padding when nav is present */
.chapter-view {
  padding-bottom: var(--bottom-nav-height);
  text-align: justify;
}

.chapter-view.poetry-style {
  text-align: left;
  padding: 0 1.5rem;
}

.poetry-content {
  padding: 1rem 0;
}

/* Poetry-style verses with stepped indent */
.poetry-verse {
  margin-bottom: 1.25em;
}

.poetry-line {
  line-height: 1.6;
  margin-bottom: 0.25em;
}

.poetry-line .verse-idx {
  font-size: 0.7em;
  font-weight: 600;
  color: var(--color-blue-200);
  margin-right: 0.5em;
  font-family: var(--font-sans);
  display: inline-block;
  width: 2em;
  text-align: right;
}

/* Error message styling (legacy) */
.error {
  padding: 1.5rem;
  text-align: center;
  color: var(--color-text-error);
}

/* Error page styling - for not-found view */
.error-page {
  padding: 3rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}

.error-icon {
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-gray-300);
  line-height: 1;
}

.error-message {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  margin: 0;
}

.error-link {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  color: var(--color-blue-400);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg-card);
  font-weight: 500;
  transition: all 0.2s ease;
  margin-top: 1rem;
}

.error-link:hover {
  background: var(--color-bg-hover);
  border-color: var(--color-gray-400);
  transform: translateY(-1px);
}

.error-link:active {
  transform: translateY(0);
}

/* Home page styling */
.home-main {
  padding-top: var(--top-bar-height);
}

.home-header {
  padding: 2rem 1.5rem 1rem;
  text-align: center;
}

.home-title {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
}

.home-subtitle {
  margin: 0.5rem 0 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Books grid - flat modern design */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 1px;
  background: var(--color-border-light);
  border-top: 1px solid var(--color-border-light);
}

.book-card {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem 0.75rem;
  background: var(--color-bg-card);
  text-align: center;
  text-decoration: none;
  color: var(--color-text-primary);
  transition: background 0.15s ease;
  min-height: 60px;
}

.book-card:hover {
  background: var(--color-gray-50);
}

.book-card:active {
  background: var(--color-gray-100);
}

.book-english {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-primary);
  line-height: 1.3;
}

/* Category-based text colors */
.book-card[data-category="torah"] .book-english {
  color: var(--category-torah);
}

.book-card[data-category="nevi_im"] .book-english {
  color: var(--category-nevi_im);
}

.book-card[data-category="ketuvim"] .book-english {
  color: var(--category-ketuvim);
}

.book-card[data-category="gospels"] .book-english {
  color: var(--category-gospels);
}

.book-card[data-category="pauline-epistles"] .book-english {
  color: var(--category-pauline-epistles);
}

.book-card[data-category="general-epistles"] .book-english {
  color: var(--category-general-epistles);
}

.book-card[data-category="apocalyptic"] .book-english {
  color: var(--category-apocalyptic);
}

@media (max-width: 400px) {
  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(85px, 1fr));
  }

  .book-english {
    font-size: 0.8125rem;
  }
}

/* Settings page styling */
.settings-main {
  padding-top: var(--top-bar-height);
}

.settings-content {
  padding: 1.5rem;
}

.setting-section {
  margin-bottom: 2rem;
}

.section-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin: 0 0 1rem 0;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.setting-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border-light);
}

.setting-item:last-child {
  border-bottom: none;
}

.setting-info {
  flex: 1;
}

.setting-label {
  display: block;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: 0.25rem;
}

.setting-description {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.setting-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle {
  display: flex;
  background: var(--color-gray-100);
  border-radius: 8px;
  padding: 0.25rem;
  gap: 0.25rem;
}

.theme-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-btn svg {
  width: 20px;
  height: 20px;
}

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

.theme-btn.active {
  background: var(--color-bg-card);
  color: var(--color-blue-400);
  box-shadow: var(--shadow-sm);
}