/* Ovie Book & v2.3 Module System Styles */

/* Module System Section */
.modules-section {
  background: var(--bg-primary);
  padding: var(--spacing-3xl) 0;
}

.modules-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.module-demo-tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.mdtab {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  color: var(--text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-family: var(--font-family);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.mdtab.active, .mdtab:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.mdcontent { display: none; }
.mdcontent.active { display: block; }

.module-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.mf-item {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  padding: var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.mf-item:hover {
  border-color: var(--brand-primary);
  transform: translateX(4px);
}

.mf-icon { font-size: 1.5rem; flex-shrink: 0; }
.mf-item h4 { color: var(--text-primary); margin-bottom: 0.25rem; font-size: 1rem; }
.mf-item p { color: var(--text-secondary); margin: 0; font-size: 0.9rem; }
.mf-item code { font-family: var(--font-mono); font-size: 0.85rem; color: var(--brand-primary); }

/* Download Grid */
.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: var(--transition-normal);
}

.download-card.primary {
  border-color: var(--brand-primary);
  background: rgba(245, 158, 11, 0.05);
}

.download-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.platform-icon { font-size: 3rem; margin-bottom: var(--spacing-md); }
.download-card h3 { color: var(--text-primary); margin-bottom: var(--spacing-xs); }
.download-card > p { color: var(--text-secondary); margin-bottom: var(--spacing-lg); font-size: 0.9rem; }

.download-btns {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.install-cmd {
  background: var(--bg-code);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.75rem;
  overflow-x: auto;
  text-align: left;
}

.install-cmd code { color: var(--text-secondary); font-family: var(--font-mono); }

.download-source {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.download-source h3 { color: var(--text-primary); margin-bottom: var(--spacing-md); }

.download-verify {
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.download-verify h4 { color: var(--text-primary); margin-bottom: var(--spacing-lg); }

.verify-steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-md);
}

.verify-step {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-primary);
}

.step-num {
  background: var(--brand-gradient);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.verify-step code { font-family: var(--font-mono); font-size: 0.85rem; color: var(--brand-primary); flex: 1; }
.verify-step span { color: var(--text-muted); font-size: 0.8rem; }

/* Book Section */
.book-section {
  background: var(--bg-secondary);
  padding: var(--spacing-3xl) 0;
}

.book-showcase {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

/* 3D Book Effect */
.book-3d {
  width: 200px;
  height: 280px;
  position: relative;
  transform-style: preserve-3d;
  transform: perspective(1000px) rotateY(-20deg);
  transition: transform var(--transition-normal);
  cursor: pointer;
}

.book-3d:hover {
  transform: perspective(1000px) rotateY(-5deg);
}

.book-front {
  width: 200px;
  height: 280px;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  border-radius: 4px 12px 12px 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 8px 8px 30px rgba(0,0,0,0.5), inset -2px 0 8px rgba(0,0,0,0.3);
  border: 1px solid rgba(245, 158, 11, 0.3);
  position: relative;
  overflow: hidden;
}

.book-front::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(135deg, rgba(245,158,11,0.1) 0%, transparent 60%);
}

.book-cover-content {
  text-align: center;
  padding: var(--spacing-lg);
  position: relative;
  z-index: 1;
}

.book-logo { font-size: 3rem; margin-bottom: var(--spacing-md); }
.book-cover-content h2 { color: white; font-size: 1rem; margin-bottom: var(--spacing-sm); line-height: 1.3; }
.book-cover-content p { color: rgba(255,255,255,0.7); font-size: 0.8rem; margin: 0; }
.book-version { display: inline-block; background: var(--brand-gradient); color: white; padding: 2px 8px; border-radius: 12px; font-size: 0.75rem; font-weight: 600; margin-top: var(--spacing-sm); }

.book-spine {
  position: absolute;
  left: -20px;
  top: 0;
  width: 20px;
  height: 280px;
  background: linear-gradient(to right, #0a0a1a, #1a1a2e);
  border-radius: 4px 0 0 4px;
  box-shadow: -4px 0 10px rgba(0,0,0,0.4);
}

.book-info { flex: 1; }

.book-meta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
}

.book-tag {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--brand-primary);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-xl);
  font-size: 0.85rem;
  font-weight: 500;
}

.book-description {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

.book-chapters { margin-bottom: var(--spacing-xl); }

.chapter-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.chapter-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.chapter-item:hover {
  border-color: var(--brand-primary);
  color: var(--text-primary);
}

.ch-num {
  background: var(--brand-gradient);
  color: white;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

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

/* Community contribute CTA */
.contribute-cta {
  text-align: center;
  margin-top: var(--spacing-3xl);
  padding: var(--spacing-2xl);
  background: var(--bg-card);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
}

.contribute-cta h3 { color: var(--text-primary); margin-bottom: var(--spacing-md); }
.contribute-cta p { color: var(--text-secondary); margin-bottom: var(--spacing-xl); max-width: 600px; margin-left: auto; margin-right: auto; }

/* Responsive */
@media (max-width: 1024px) {
  .modules-showcase { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
  .book-showcase { grid-template-columns: 1fr; }
  .book-3d { margin: 0 auto; }
  .verify-steps { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .chapter-list { grid-template-columns: 1fr; }
  .book-actions { flex-direction: column; }
  .book-actions .btn { width: 100%; justify-content: center; }
}