/* ===========================
   DuoDuoYu — Home Page
   =========================== */

/* Hero */
.hero {
  padding: var(--space-xl) 0 var(--space-2xl);
  overflow: hidden;
}
.hero .container {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}
.hero-content { flex: 1; }
.hero-badge {
  display: inline-block;
  background: #FFF0E0;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.8rem;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}
.hero-title {
  font-size: clamp(1.8rem, 5vw, 3rem);
  color: var(--color-text);
  margin-bottom: var(--space-md);
  line-height: 1.2;
}
.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  max-width: 480px;
}
.hero-actions { margin-bottom: var(--space-lg); display: flex; flex-wrap: wrap; gap: var(--space-sm); }
.hero-langs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.hero-langs span {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-border);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

/* Hero Visual */
.hero-visual { display: none; }
@media (min-width: 700px) { .hero-visual { display: flex; align-items: center; justify-content: center; } }
.hero-book-stack { position: relative; width: 180px; height: 180px; }
.hero-book {
  position: absolute;
  width: 100px;
  height: 120px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  box-shadow: var(--shadow-md);
  animation: float 3s ease-in-out infinite;
}
.book-1 { background: #FFD3A5; top: 0; left: 0; animation-delay: 0s; }
.book-2 { background: #B5EAD7; top: 30px; left: 45px; animation-delay: 0.5s; }
.book-3 { background: #C7CEEA; top: 60px; left: 80px; animation-delay: 1s; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Categories */
.categories-section { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.categories-scroll {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding-bottom: var(--space-sm);
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.categories-scroll::-webkit-scrollbar { display: none; }
.category-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  background: white;
  border: 2px solid var(--color-border);
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  color: var(--color-text);
}
.category-chip:hover, .category-chip.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* Section titles */
.section-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-lg);
  color: var(--color-text);
}
.section-alt { background: white; }

/* Mobile */
@media (max-width: 599px) {
  .hidden-mobile { display: none; }
  .hero { padding-top: var(--space-lg); }
}