/* ═══════════════════════════════════════════════
   银幕年华 · 全球中老年数字艺人AI短剧大赛
   样式文件
   ═══════════════════════════════════════════════ */

/* ─── 变量 ─────────────────────────────────────── */
:root {
  --gold: #C9A96E;
  --gold-light: #E8D5A0;
  --gold-dark: #A88840;
  --gold-metal: #D4AF37;
  --wine: #8B1A1A;
  --wine-light: #A52A2A;
  --cream: #FDF8F0;
  --cream-dark: #F5EDE0;
  --text-primary: #2C2C2C;
  --text-secondary: #6B6B6B;
  --text-light: #999;
  --border: #E8E0D6;
  --border-light: #F0E8DE;
  --white: #FFFFFF;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: all 0.3s ease;
  --font-title: 'Noto Serif SC', 'Songti SC', serif;
  --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-num: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--cream);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul, ol {
  list-style: none;
}

/* ─── Typography ────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-title);
  line-height: 1.3;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
  font-weight: 600;
}

.section-tag::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--gold);
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2.375rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─── Container ─────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ─── Section ───────────────────────────────────── */
.section {
  padding: 80px 0;
}

@media (max-width: 767px) {
  .section { padding: 50px 0; }
}

/* ─── Buttons ───────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 32px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  min-height: 48px;
  min-width: 120px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gold-metal), var(--gold));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(212, 175, 55, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--gold);
  border: 2px solid var(--gold);
}

.btn-outline:hover {
  background: var(--gold);
  color: var(--white);
}

@media (max-width: 767px) {
  .btn {
    font-size: 0.9rem;
    padding: 12px 24px;
  }
}

/* ═══════════════════════════════════════════════
   M1: 导航栏
   ═══════════════════════════════════════════════ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(253, 248, 240, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: var(--transition);
}

.navbar.scrolled {
  background: var(--cream);
  border-bottom-color: var(--border);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.navbar-logo img {
  height: 36px;
  width: auto;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.navbar-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gold);
  transition: var(--transition);
}

.navbar-links a:hover {
  color: var(--gold);
}

.navbar-links a:hover::after {
  width: 100%;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-primary);
}

.navbar-toggle svg {
  width: 24px;
  height: 24px;
}

@media (max-width: 1023px) {
  .navbar-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--cream);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }

  .navbar-links.open {
    display: flex;
  }

  .navbar-toggle {
    display: block;
  }
}

/* ═══════════════════════════════════════════════
   M2: 英雄区 (Hero)
   ═══════════════════════════════════════════════ */
.hero {
  min-height: auto;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #F5EDE0 0%, #E8D5A0 30%, #D4AF37 70%, #C9A96E 100%);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/hero/hero-bg.jpg') center/cover no-repeat;
  opacity: 0.15;
  mix-blend-mode: overlay;
}

.hero-particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--gold-metal);
  border-radius: 50%;
  opacity: 0.3;
  animation: float-particle 6s infinite;
}

@keyframes float-particle {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.3; }
  50% { transform: translateY(-40px) scale(1.5); opacity: 0.6; }
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 90px 20px 50px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text {
  animation: fadeInUp 0.8s ease;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(139, 26, 26, 0.1);
  color: var(--wine);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-title .gold-text {
  background: linear-gradient(135deg, var(--gold-dark), var(--gold-metal), var(--gold-dark));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-family: var(--font-title);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--wine);
  margin-bottom: 12px;
  font-style: italic;
}

.hero-slogan {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}

.hero-stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-stat-badge {
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(4px);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
  border: 1px solid var(--border-light);
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-image {
  animation: fadeInRight 1s ease 0.3s both;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-placeholder {
  width: 100%;
  max-width: 450px;
  aspect-ratio: 3/4;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--cream), var(--cream-dark));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.1);
  border: 1px solid rgba(255,255,255,0.5);
  color: var(--text-light);
  font-size: 0.9rem;
}

.hero-image-placeholder .icon {
  font-size: 4rem;
  opacity: 0.6;
}

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

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

@media (max-width: 1023px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 30px;
    padding: 80px 20px 40px;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-stats-row {
    justify-content: center;
  }

  .hero-image-placeholder {
    max-width: 300px;
  }
}

@media (max-width: 767px) {
  .hero-content {
    padding: 70px 20px 30px;
  }
}

/* ═══════════════════════════════════════════════
   M3: 大赛简介
   ═══════════════════════════════════════════════ */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.intro-highlight {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gold);
  margin-top: 16px;
  padding: 12px 16px;
  background: rgba(201, 169, 110, 0.1);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--gold);
}

.intro-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.intro-stat-card {
  text-align: center;
  padding: 28px 20px;
  border-radius: var(--radius);
  background: var(--white);
  border: 1px solid var(--border);
  transition: var(--transition);
}

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

.intro-stat-icon {
  font-size: 1.8rem;
  margin-bottom: 8px;
}

.intro-stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--gold);
  font-family: var(--font-num);
  line-height: 1.1;
  margin-bottom: 4px;
}

.intro-stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

@media (max-width: 767px) {
  .intro-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* ═══════════════════════════════════════════════
   M4: 三大赛道
   ═══════════════════════════════════════════════ */
.tracks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.track-card {
  border-radius: var(--radius);
  padding: 36px 28px;
  background: var(--white);
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}

.track-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--gold);
}

.track-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  display: block;
}

.track-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.track-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
  line-height: 1.6;
}

.track-audience {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 12px;
}

.track-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gold);
  cursor: pointer;
  transition: var(--transition);
}

.track-link:hover {
  gap: 8px;
}

@media (max-width: 1023px) {
  .tracks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .tracks-grid {
    grid-template-columns: 1fr;
  }
}

/* ═══════════════════════════════════════════════
   M5: 大赛流程（时间轴）
   ═══════════════════════════════════════════════ */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline-track {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  position: relative;
}

.timeline-track::before {
  content: '';
  position: absolute;
  top: 32px;
  left: 10%;
  right: 10%;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  z-index: 0;
}

.timeline-track::after {
  content: '';
  position: absolute;
  top: 32px;
  left: 10%;
  height: 3px;
  background: var(--gold);
  border-radius: 2px;
  z-index: 1;
  width: 0%;
  transition: width 1s ease;
}

.timeline-item {
  text-align: center;
  padding: 0 12px;
  position: relative;
  z-index: 2;
}

.timeline-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--border);
  border: 3px solid var(--cream);
  margin: 0 auto 16px;
  position: relative;
  z-index: 2;
  transition: var(--transition);
}

.timeline-item.active .timeline-dot {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 169, 110, 0.2);
}

.timeline-item.completed .timeline-dot {
  background: var(--gold);
}

.timeline-item.completed .timeline-dot::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 10px;
  color: var(--white);
  font-weight: 700;
}

.timeline-date {
  font-size: 0.8rem;
  color: var(--gold);
  font-weight: 600;
  margin-bottom: 6px;
}

.timeline-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.timeline-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.timeline-status {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 10px;
  border-radius: 50px;
  margin-top: 8px;
  background: rgba(201, 169, 110, 0.15);
  color: var(--gold);
  font-weight: 600;
}

@media (max-width: 767px) {
  .timeline-track {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .timeline-track::before,
  .timeline-track::after {
    display: none;
  }

  .timeline-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    text-align: left;
  }

  .timeline-dot {
    margin: 4px 0 0;
    flex-shrink: 0;
  }
}

/* ═══════════════════════════════════════════════
   M6: 中老年数字艺人
   ═══════════════════════════════════════════════ */
.artists-scroll {
  position: relative;
  overflow: hidden;
  padding: 0 0;
}

.artists-track {
  display: flex;
  gap: 24px;
  width: max-content;
  padding: 10px 0 20px;
  animation: scroll-artists 30s linear infinite;
}

/* 鼠标悬停暂停滚动 */
.artists-scroll:hover .artists-track {
  animation-play-state: paused;
}

@keyframes scroll-artists {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.artist-card {
  flex: 0 0 260px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--border);
  transition: var(--transition);
}

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

.artist-image {
  aspect-ratio: 3/4;
  background: linear-gradient(135deg, var(--cream), var(--cream-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--text-light);
}

.artist-info {
  padding: 16px;
  text-align: center;
}

.artist-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.artist-tag {
  font-size: 0.8rem;
  color: var(--gold);
}

@media (max-width: 767px) {
  .artist-card { flex: 0 0 200px; }
}

/* ═══════════════════════════════════════════════
   M7: 评委阵容
   ═══════════════════════════════════════════════ */
.judges-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.judge-card {
  text-align: center;
  padding: 28px 16px;
  border-radius: var(--radius);
  background: var(--white);
  border: 1px solid var(--border);
  transition: var(--transition);
}

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

.judge-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--cream), var(--cream-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--text-light);
}

.judge-name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.judge-title {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

@media (max-width: 1023px) {
  .judges-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 767px) {
  .judges-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ═══════════════════════════════════════════════
   M8: 优秀作品展示
   ═══════════════════════════════════════════════ */
.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.work-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--border);
  transition: var(--transition);
}

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

.work-cover {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--cream), var(--cream-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  font-size: 2rem;
  color: var(--text-light);
}

.work-play-btn {
  position: absolute;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--gold);
  transition: var(--transition);
}

.work-card:hover .work-play-btn {
  background: var(--gold);
  color: var(--white);
}

.work-info {
  padding: 14px;
}

.work-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.work-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  gap: 8px;
}

.work-tag {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(201, 169, 110, 0.1);
  color: var(--gold);
}

@media (max-width: 1023px) {
  .works-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .works-grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════════════════
   M9: 合作伙伴
   ═══════════════════════════════════════════════ */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  max-width: 800px;
  margin: 0 auto;
}

.partner-logo {
  padding: 16px 28px;
  border-radius: var(--radius-sm);
  background: var(--white);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-light);
  transition: var(--transition);
  filter: grayscale(1);
}

.partner-logo:hover {
  filter: grayscale(0);
  color: var(--text-primary);
  border-color: var(--gold);
  box-shadow: var(--shadow);
}

/* ═══════════════════════════════════════════════
   M10: 底部信息
   ═══════════════════════════════════════════════ */
.footer {
  background: #2C2C2C;
  color: #999;
  padding: 48px 0 24px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand {
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gold-light);
  margin-bottom: 8px;
}

.footer-copy {
  font-size: 0.8rem;
  color: #777;
  margin-bottom: 12px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 0.85rem;
  color: #999;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--gold);
}

.footer-social {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition);
  color: #999;
}

.footer-social a:hover {
  background: var(--gold);
  color: #2C2C2C;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px;
  text-align: center;
  font-size: 0.8rem;
  color: #666;
}

@media (max-width: 767px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

/* ─── 悬浮按钮 ──────────────────────────────────── */
.fab {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  padding: 16px 28px;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--gold-metal), var(--gold));
  color: var(--white);
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(212, 175, 55, 0.4);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: pulse-fab 2s infinite;
}

.fab:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(212, 175, 55, 0.5);
}

@keyframes pulse-fab {
  0%, 100% { box-shadow: 0 4px 20px rgba(212, 175, 55, 0.4); }
  50% { box-shadow: 0 4px 30px rgba(212, 175, 55, 0.6); }
}

@media (max-width: 767px) {
  .fab {
    bottom: 16px;
    right: 16px;
    padding: 12px 20px;
    font-size: 0.9rem;
  }
}

/* ─── 滚动动画类 ────────────────────────────────── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll.delay-1 { transition-delay: 0.1s; }
.animate-on-scroll.delay-2 { transition-delay: 0.2s; }
.animate-on-scroll.delay-3 { transition-delay: 0.3s; }
.animate-on-scroll.delay-4 { transition-delay: 0.4s; }

/* ─── 背景色交替 ────────────────────────────────── */
.bg-cream-dark {
  background: var(--cream-dark);
}

.bg-white {
  background: var(--white);
}

/* ─── 响应式文本 ────────────────────────────────── */
.text-center {
  text-align: center;
}