/* ====================================================== */
/*  MODERN BOOK DETAILS PAGE - PROFESSIONAL UI STYLES   */
/*  Enhanced StudoKe Theme with Dark/Light Mode Support  */
/* ====================================================== */

:root {
  /* Light Theme Colors */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: rgba(37, 99, 235, 0.1);
  --primary-glow: rgba(37, 99, 235, 0.3);

  --secondary: #64748b;
  --success: #059669;
  --warning: #d97706;
  --error: #dc2626;

  /* Light Mode Backgrounds */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-hero: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);

  /* Light Mode Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;

  /* Light Mode Borders & Shadows */
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1),
    0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1),
    0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;

  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

/* Dark Theme */
[data-theme="dark"] {
  /* Dark Mode Backgrounds */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-gradient: linear-gradient(135deg, #4338ca 0%, #7c3aed 100%);
  --bg-hero: linear-gradient(135deg, #1e293b 0%, #334155 100%);

  /* Dark Mode Text */
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  /* Dark Mode Borders & Shadows */
  --border: #334155;
  --border-hover: #475569;
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.4);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.4);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4),
    0 4px 6px -4px rgb(0 0 0 / 0.4);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.4),
    0 8px 10px -6px rgb(0 0 0 / 0.4);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.6);
}

/* Auto Dark Mode Detection */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    /* Dark Mode Backgrounds */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --bg-gradient: linear-gradient(135deg, #4338ca 0%, #7c3aed 100%);
    --bg-hero: linear-gradient(135deg, #1e293b 0%, #334155 100%);

    /* Dark Mode Text */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --text-inverse: #0f172a;

    /* Dark Mode Borders & Shadows */
    --border: #334155;
    --border-hover: #475569;
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.4);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.4);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4),
      0 2px 4px -2px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4),
      0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.4),
      0 8px 10px -6px rgb(0 0 0 / 0.4);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.6);
  }
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Page Container */
.book-details-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem;
  min-height: 100vh;
  animation: fadeInUp 0.6s ease-out;
}

/* Alert Styles */
.alert {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.5rem;
  margin-bottom: 2rem;
  border-radius: var(--radius-lg);
  font-weight: 500;
  animation: slideDown 0.4s ease-out;
}

.alert-success {
  background: rgba(5, 150, 105, 0.1);
  color: var(--success);
  border: 1px solid rgba(5, 150, 105, 0.2);
}

.alert-icon {
  font-size: 1.25rem;
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  font-size: 0.875rem;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.breadcrumb-nav .separator {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.breadcrumb-nav .current {
  color: var(--primary);
  font-weight: 600;
}

/* Page Layout */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 3rem;
  align-items: start;
}

/* Main Content Column */
.main-content-column {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Book Hero Section */
.book-hero-section {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  padding: 3rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.book-hero-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--bg-gradient);
}

.book-hero-section {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: start;
}

/* Book Cover */
.book-cover-container {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-2xl);
  background: var(--bg-tertiary);
  transition: var(--transition);
}

.book-cover-container:hover {
  transform: translateY(-8px);
  box-shadow: 0 32px 64px -12px rgb(0 0 0 / 0.25);
}

.book-cover-large {
  width: 100%;
  height: 420px;
  object-fit: cover;
  display: block;
}

.book-overlay-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 2;
}

.price-badge {
  background: linear-gradient(135deg, var(--warning) 0%, #f59e0b 100%);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  text-shadow: 0 1px 2px rgb(0 0 0 / 0.5);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
}

.free-badge {
  background: linear-gradient(135deg, var(--success) 0%, #10b981 100%);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 600;
  text-shadow: 0 1px 2px rgb(0 0 0 / 0.5);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(10px);
}

/* Book Info */
.book-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.book-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.1;
  margin: 0;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--primary) 100%
  );
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 3s ease-in-out infinite;
}

.book-author {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.book-author::before {
  content: "✍️";
  font-size: 1.25rem;
}

.book-meta {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.meta-icon {
  font-size: 1.125rem;
  opacity: 0.8;
}

.meta-item a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

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

/* Action Buttons */
.action-buttons {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transition: width 0.6s ease, height 0.6s ease;
  transform: translate(-50%, -50%);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-hover) 100%
  );
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--primary-glow);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--primary);
  border: 2px solid var(--border);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background: var(--primary);
  color: var(--text-inverse);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-icon {
  font-size: 1.125rem;
  opacity: 0.9;
}

/* Content Sections */
.book-description-section,
.book-preview-section,
.social-share-section {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 2.5rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.book-description-section:hover,
.book-preview-section:hover,
.social-share-section:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.book-description-section h3,
.book-preview-section h3,
.social-share-section h3 {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border);
}

.section-icon {
  font-size: 1.5rem;
  opacity: 0.8;
}

.description-content {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 1.05rem;
}

/* Preview Section */
.preview-info {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.preview-container {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

.preview-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: transparent;
  z-index: 10;
  pointer-events: none;
}

.preview-embed {
  width: 100%;
  height: 600px;
  border: none;
  display: block;
}

/* Social Share */
.social-share-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.share-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  border: 1px solid var(--border);
}

.share-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.share-btn-facebook:hover {
  background: #1877f2;
  color: white;
}
.share-btn-twitter:hover {
  background: #1da1f2;
  color: white;
}
.share-btn-whatsapp:hover {
  background: #25d366;
  color: white;
}
.share-btn-linkedin:hover {
  background: #0077b5;
  color: white;
}
.share-btn-telegram:hover {
  background: #0088cc;
  color: white;
}

/* Sidebar */
.sidebar-column {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: sticky;
  top: 2rem;
  height: fit-content;
}

.sidebar-widget {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 2rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.sidebar-widget:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.sidebar-widget h3 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border);
}

.widget-icon {
  font-size: 1.25rem;
  opacity: 0.8;
}

/* Related Books */
.related-books-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.related-book-card {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
}

.related-book-card:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.book-cover-small {
  flex-shrink: 0;
  width: 60px;
  height: 80px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-tertiary);
}

.book-cover-small img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.related-book-card .book-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.related-book-card h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-book-card .book-author {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0;
}

.related-book-card .book-meta {
  padding: 0;
  background: none;
  border: none;
  margin-top: auto;
}

.book-price {
  font-weight: 600;
  color: var(--primary);
  font-size: 0.85rem;
}

.book-free {
  font-weight: 600;
  color: var(--success);
  font-size: 0.85rem;
}

.no-related {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-muted);
}

.no-related-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Payment Modal */
.payment-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  animation: fadeIn 0.3s ease;
}

.payment-modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  padding: 2.5rem;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-2xl);
  animation: slideUp 0.4s ease;
}

.payment-modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.payment-modal-close:hover {
  background: var(--error);
  color: white;
  transform: rotate(90deg);
}

.payment-modal-content h3 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
  text-align: center;
}

.payment-modal-content p {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 2rem;
}

#payment-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

#payment-form label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

#payment-form input {
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  transition: var(--transition);
}

#payment-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

#payment-status {
  text-align: center;
  padding: 2rem;
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* Login Popup */
.login-popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.login-popup-content {
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  padding: 3rem;
  text-align: center;
  max-width: 400px;
  width: 90%;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-2xl);
  animation: slideUp 0.4s ease;
}

.login-popup-content .icon {
  font-size: 4rem;
  margin-bottom: 1.5rem;
  opacity: 0.8;
}

.login-popup-content h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.login-popup-content p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.login-popup-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  background: linear-gradient(
    135deg,
    var(--primary) 0%,
    var(--primary-hover) 100%
  );
  color: var(--text-inverse);
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.login-popup-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--primary-glow);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    transform: translateY(50px) scale(0.95);
    opacity: 0;
  }
  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

@keyframes slideDown {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes shimmer {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .page-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .sidebar-column {
    position: static;
    order: -1;
  }

  .book-hero-section {
    grid-template-columns: 240px 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .book-details-container {
    padding: 0.5rem;
  }

  .book-hero-section {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2rem;
  }

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

  .action-buttons {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }

  .social-share-buttons {
    justify-content: center;
  }

  .related-books-grid {
    gap: 1rem;
  }

  .payment-modal-content {
    padding: 2rem;
    margin: 1rem;
  }
}

@media (max-width: 480px) {
  .book-hero-section {
    padding: 1.5rem;
  }

  .book-title {
    font-size: 1rem;
  }

  .book-author {
    font-size: 1.25rem;
  }

  .btn {
    padding: 0.875rem 1.5rem;
    font-size: 0.95rem;
  }

  .breadcrumb-nav {
    font-size: 0.8rem;
    padding: 0.75rem 1rem;
  }

  .sidebar-widget,
  .book-description-section,
  .book-preview-section,
  .social-share-section {
    padding: 1.5rem;
  }
}

@media (max-width: 768px) {
  .page-layout {
    display: flex;
    flex-direction: column;
  }

  .main-content-column {
    order: 1;
  }

  .sidebar-column {
    order: 2 !important;
    margin-top: 2rem;
  }
}