/* ===================================
   Books.izonewe.com - Premium Book Reader
   Modern, elegant design with dark mode
   =================================== */

:root {
  /* Color Palette - Elegant Dark Theme */
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --bg-elevated: #1f2b47;

  --text-primary: #e8e8e8;
  --text-secondary: #a0a0b0;
  --text-muted: #6b6b80;

  --accent-primary: #7c3aed;
  --accent-secondary: #a78bfa;
  --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #a78bfa 100%);

  --border-color: rgba(255, 255, 255, 0.08);
  --shadow-color: rgba(0, 0, 0, 0.3);

  /* Typography */
  --font-display: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: "Merriweather", Georgia, serif;

  /* Spacing */
  --container-max: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.3;
}

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

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

/* ===================================
   Layout
   =================================== */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ===================================
   Loading State
   =================================== */

.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  gap: var(--spacing-md);
  color: var(--text-secondary);
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ===================================
   Error State
   =================================== */

.error-state {
  text-align: center;
  padding: var(--spacing-xl);
}

.error-state h2 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.error-state p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* ===================================
   Site Header
   =================================== */

.site-header {
  background: linear-gradient(
    180deg,
    var(--bg-secondary) 0%,
    var(--bg-primary) 100%
  );
  padding: var(--spacing-xl) 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.site-title {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.site-title .icon {
  font-size: 2rem;
  -webkit-text-fill-color: initial;
}

.site-subtitle {
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
  font-size: 1.1rem;
}

/* ===================================
   Breadcrumb Navigation
   =================================== */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: var(--font-display);
  font-size: 0.9rem;
}

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

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

.breadcrumb-separator {
  color: var(--text-muted);
}

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

/* ===================================
   Book Header
   =================================== */

.book-header,
.chapter-header {
  background: var(--bg-secondary);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
}

/* ===================================
   Book Grid
   =================================== */

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-xl) 0;
}

.book-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-normal),
    box-shadow var(--transition-normal);
  border: 1px solid var(--border-color);
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-color);
}

.book-cover-wrapper {
  position: relative;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  background: var(--bg-elevated);
}

.book-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.book-card:hover .book-cover {
  transform: scale(1.05);
}

.book-info {
  padding: var(--spacing-md);
}

.book-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-author {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: var(--font-display);
}

/* ===================================
   Book Detail
   =================================== */

.book-detail {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--spacing-xl);
  padding: var(--spacing-xl) 0;
  align-items: start;
}

@media (max-width: 768px) {
  .book-detail {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .book-detail-cover {
    max-width: 280px;
    margin: 0 auto;
  }
}

.book-detail-cover img {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 40px var(--shadow-color);
}

.book-detail-title {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.book-detail-author {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.book-detail-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

/* ===================================
   Buttons
   =================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-elevated);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-primary {
  background: var(--accent-gradient);
  border: none;
  color: white;
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-elevated);
  border: 1px solid var(--accent-primary);
  color: var(--accent-secondary);
}

.btn-secondary:hover {
  background: var(--accent-primary);
  color: white;
  transform: translateY(-2px);
}

.book-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .book-actions {
    justify-content: center;
  }
}

.cover-downloads {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.cover-downloads h4 {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.download-links {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.8rem;
}

@media (max-width: 768px) {
  .download-links {
    justify-content: center;
  }
}

.btn-nav {
  min-width: 120px;
}

/* ===================================
   Chapters Section
   =================================== */

.chapters-section {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border-color);
}

.section-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.chapter-list {
  list-style: none;
}

.chapter-item {
  border-bottom: 1px solid var(--border-color);
}

.chapter-item:first-child {
  border-top: 1px solid var(--border-color);
}

.chapter-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  transition: background var(--transition-fast);
}

.chapter-link:hover {
  background: var(--bg-card);
}

.chapter-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bg-elevated);
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-secondary);
  flex-shrink: 0;
}

.chapter-link .chapter-title {
  flex: 1;
  color: var(--text-primary);
  font-family: var(--font-display);
}

.chapter-arrow {
  color: var(--text-muted);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.chapter-link:hover .chapter-arrow {
  transform: translateX(4px);
  color: var(--accent-secondary);
}

/* ===================================
   Chapter Content
   =================================== */

.chapter-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  gap: var(--spacing-sm);
}

.chapter-nav-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
  flex: 1;
  margin: 0;
  font-family: var(--font-display);
}

.chapter-content {
  padding: var(--spacing-md) 0;
}

.chapter-body {
  max-width: 680px;
  margin: 0 auto;
  font-size: 1.125rem;
  color: var(--text-primary);
}

.chapter-body p {
  margin-bottom: var(--spacing-md);
  text-indent: 1.5em;
}

.chapter-body p:first-child {
  text-indent: 0;
}

.chapter-body img {
  margin: var(--spacing-lg) auto;
  border-radius: var(--radius-sm);
}

/* Coloring book pages */
.chapter-body .coloring-page {
  text-align: center;
}

.chapter-body .coloring-page h1 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-lg);
  color: var(--accent-secondary);
}

.chapter-body .coloring-grid {
  display: grid !important;
  gap: var(--spacing-md) !important;
}

.chapter-body .coloring-grid img {
  border-radius: var(--radius-md);
  background: white;
  padding: var(--spacing-sm);
}

/* ===================================
   Responsive
   =================================== */

@media (max-width: 640px) {
  .site-title {
    font-size: 1.8rem;
  }

  .book-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--spacing-md);
  }

  .book-detail-title {
    font-size: 1.5rem;
  }

  .chapter-nav-title {
    font-size: 1rem;
  }

  .chapter-body {
    font-size: 1rem;
  }

  .btn-nav {
    min-width: auto;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.85rem;
  }
}