/* ============================================================
   糖心Vlog 官网主样式 | www.eidu2jq.cn
   版本: 1.0 | 移动端优先
   ============================================================ */

/* ---- CSS变量 ---- */
:root {
  --brand-primary: #e85d7a;
  --brand-dark: #1a1a2e;
  --brand-accent: #c94b6a;
  --text-dark: #222222;
  --text-mid: #555555;
  --text-light: #888888;
  --bg-white: #ffffff;
  --bg-light: #fafafa;
  --bg-section: #f5f5f7;
  --border-color: #e8e8e8;
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-md: 0 6px 30px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.14);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --font-main: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-main);
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ---- 布局容器 ---- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.section { padding: 80px 0; }
.section-alt { background: var(--bg-section); }
.section-dark { background: var(--brand-dark); color: #fff; }

/* ---- 通用标题 ---- */
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brand-primary);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.25;
  margin-bottom: 16px;
}
.section-subtitle {
  font-size: 1rem;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}
.update-time {
  font-size: 12px;
  color: #bbb;
  margin-top: 10px;
}

/* ============================================================
   导航栏
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  border-color: var(--border-color);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--brand-dark);
  letter-spacing: -0.5px;
}
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 900;
  flex-shrink: 0;
}
.logo span { color: var(--brand-primary); }

.main-nav { display: flex; align-items: center; gap: 32px; }
.main-nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-mid);
  position: relative;
  padding-bottom: 2px;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: var(--brand-primary);
  transition: width var(--transition);
}
.main-nav a:hover, .main-nav a.active { color: var(--brand-primary); }
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }

.nav-cta {
  background: var(--brand-primary);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 24px;
  font-size: 13px;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition) !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--brand-accent) !important; transform: translateY(-1px); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- 搜索栏 ---- */
.search-bar-wrap {
  background: var(--bg-section);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 0;
  margin-top: 64px;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  max-width: 640px;
  margin: 0 auto;
  background: #fff;
  border: 1.5px solid var(--border-color);
  border-radius: 32px;
  padding: 0 6px 0 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-bar-inner:focus-within {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(232,93,122,0.12);
}
.search-bar-inner input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 14px;
  color: var(--text-dark);
  background: transparent;
  padding: 10px 0;
  font-family: var(--font-main);
}
.search-bar-inner input::placeholder { color: #bbb; }
.search-btn {
  background: var(--brand-primary);
  color: #fff;
  border: none;
  border-radius: 24px;
  padding: 7px 18px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}
.search-btn:hover { background: var(--brand-accent); }

/* ============================================================
   Hero Banner
   ============================================================ */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--brand-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.35;
  transform: scale(1.05);
  transition: opacity 1s ease;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(200,75,106,0.25) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  color: #fff;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(232,93,122,0.2);
  border: 1px solid rgba(232,93,122,0.4);
  color: #ffb3c1;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 24px;
}
.hero-badge::before { content: '▶'; font-size: 10px; }
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero h1 em { color: var(--brand-primary); font-style: normal; }
.hero-desc {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  max-width: 520px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-primary);
  color: #fff;
  padding: 14px 32px;
  border-radius: 32px;
  font-size: 15px;
  font-weight: 700;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 20px rgba(232,93,122,0.35);
}
.btn-primary:hover {
  background: var(--brand-accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(232,93,122,0.45);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 2px solid rgba(255,255,255,0.5);
  color: #fff;
  padding: 12px 28px;
  border-radius: 32px;
  font-size: 15px;
  font-weight: 600;
  transition: border-color var(--transition), background var(--transition);
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.1); }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  flex-wrap: wrap;
}
.hero-stat-item { text-align: left; }
.hero-stat-num {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}
.hero-stat-num span { color: var(--brand-primary); }
.hero-stat-label {
  font-size: 12px;
  color: rgba(255,255,255,0.55);
  margin-top: 4px;
  letter-spacing: 0.5px;
}

/* ============================================================
   视频卡片网格
   ============================================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #111;
}
.video-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease, opacity 0.3s ease;
}
.video-card:hover .video-thumb img {
  transform: scale(1.06);
  opacity: 0.8;
}
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .play-btn { opacity: 1; }
.play-btn-circle {
  width: 60px; height: 60px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  transition: transform var(--transition);
}
.video-card:hover .play-btn-circle { transform: scale(1.1); }
.play-btn-circle svg {
  width: 22px; height: 22px;
  fill: var(--brand-primary);
  margin-left: 3px;
}
.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 10px; left: 10px;
  background: var(--brand-primary);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  line-height: 1.45;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-desc {
  font-size: 13px;
  color: var(--text-light);
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--text-light);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 13px; height: 13px; fill: currentColor; }

/* ============================================================
   品牌理念
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-img-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.about-img-wrap img { width: 100%; height: 420px; object-fit: cover; }
.about-badge {
  position: absolute;
  bottom: 24px; left: 24px;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  box-shadow: var(--shadow-md);
}
.about-badge-num { font-size: 1.8rem; font-weight: 800; color: var(--brand-primary); }
.about-badge-label { font-size: 12px; color: var(--text-light); }
.about-content h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
}
.about-content p { color: var(--text-mid); line-height: 1.9; margin-bottom: 16px; }
.about-features { display: flex; flex-direction: column; gap: 16px; margin-top: 28px; }
.about-feature {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.feature-icon {
  width: 40px; height: 40px;
  background: rgba(232,93,122,0.1);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-size: 18px;
}
.feature-text h4 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.feature-text p { font-size: 13px; color: var(--text-light); margin: 0; }

/* ============================================================
   数据成果
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat-item {
  background: #fff;
  padding: 40px 24px;
  text-align: center;
}
.stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--brand-primary);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.5;
}

/* ============================================================
   团队
   ============================================================ */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 28px;
}
.team-card {
  background: #fff;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  text-align: center;
}
.team-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.team-avatar {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: top;
}
.team-info { padding: 20px 16px 24px; }
.team-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.team-role { font-size: 13px; color: var(--brand-primary); font-weight: 500; margin-bottom: 10px; }
.team-bio { font-size: 13px; color: var(--text-light); line-height: 1.7; }

/* ============================================================
   媒体报道
   ============================================================ */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.media-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--brand-primary);
  transition: transform var(--transition), box-shadow var(--transition);
}
.media-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.media-source {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand-primary);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.media-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  line-height: 1.5;
  margin-bottom: 12px;
}
.media-date { font-size: 12px; color: var(--text-light); }
.media-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  color: var(--brand-primary);
  font-weight: 500;
  margin-top: 12px;
}
.media-link:hover { text-decoration: underline; }

/* ============================================================
   用户评价
   ============================================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}
.review-card:hover { transform: translateY(-4px); }
.review-stars { color: #f5a623; font-size: 16px; margin-bottom: 12px; letter-spacing: 2px; }
.review-text {
  font-size: 14px;
  color: var(--text-mid);
  line-height: 1.8;
  margin-bottom: 16px;
  font-style: italic;
}
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 600; }
.review-meta { font-size: 12px; color: var(--text-light); }

/* ============================================================
   FAQ
   ============================================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border-bottom: 1px solid var(--border-color);
  overflow: hidden;
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 0;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  transition: color var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--brand-primary); }
.faq-icon {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 1.5px solid var(--border-color);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
  font-size: 14px;
  color: var(--text-light);
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  border-color: var(--brand-primary);
  background: var(--brand-primary);
  color: #fff;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-answer-inner {
  padding: 0 0 20px;
  font-size: 14px;
  color: var(--text-mid);
  line-height: 1.85;
}
.faq-item.open .faq-answer { max-height: 300px; }

/* ============================================================
   合作入口
   ============================================================ */
.cta-section {
  background: linear-gradient(135deg, var(--brand-dark) 0%, #2d1b3d 100%);
  padding: 100px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%; left: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(232,93,122,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.cta-section h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}
.cta-section p {
  font-size: 1rem;
  color: rgba(255,255,255,0.65);
  margin-bottom: 36px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}
.cta-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: #111;
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand p { font-size: 13px; line-height: 1.8; color: rgba(255,255,255,0.5); }
.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}
.social-btn {
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.08);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  transition: background var(--transition), transform var(--transition);
  color: rgba(255,255,255,0.7);
}
.social-btn:hover { background: var(--brand-primary); transform: translateY(-2px); color: #fff; }
.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--brand-primary); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: rgba(255,255,255,0.35);
}
.footer-bottom a { color: rgba(255,255,255,0.35); }
.footer-bottom a:hover { color: var(--brand-primary); }

/* ============================================================
   联系页面
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 60px;
  align-items: start;
}
.contact-info-list { display: flex; flex-direction: column; gap: 24px; margin-top: 28px; }
.contact-info-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-icon {
  width: 44px; height: 44px;
  background: rgba(232,93,122,0.1);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-info-item h4 { font-size: 14px; font-weight: 600; margin-bottom: 4px; }
.contact-info-item p { font-size: 13px; color: var(--text-light); }
.contact-form { background: #fff; border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-md); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 8px; color: var(--text-dark); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 14px;
  font-family: var(--font-main);
  color: var(--text-dark);
  background: var(--bg-light);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(232,93,122,0.12);
  background: #fff;
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-light);
  padding: 16px 0;
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--brand-primary); }
.breadcrumb .sep { color: #ccc; }
.breadcrumb .current { color: var(--text-dark); font-weight: 500; }

/* ============================================================
   页面Hero（子页面）
   ============================================================ */
.page-hero {
  background: linear-gradient(135deg, var(--brand-dark) 0%, #2d1b3d 100%);
  padding: 100px 0 60px;
  color: #fff;
  text-align: center;
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; margin-bottom: 12px; }
.page-hero p { font-size: 1rem; color: rgba(255,255,255,0.65); max-width: 480px; margin: 0 auto; }

/* ============================================================
   懒加载淡入
   ============================================================ */
.lazy { opacity: 0; transition: opacity 0.6s ease; }
.lazy.loaded { opacity: 1; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-img-wrap img { height: 320px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .main-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: rgba(255,255,255,0.98); padding: 20px; gap: 0; border-bottom: 1px solid var(--border-color); }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 0; border-bottom: 1px solid var(--border-color); font-size: 15px; }
  .main-nav a::after { display: none; }
  .nav-cta { margin-top: 12px; text-align: center; }
  .hamburger { display: flex; }
  .hero { min-height: 70vh; }
  .hero-stats { gap: 24px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero h1 { font-size: 1.9rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { gap: 16px; }
  .hero-stat-num { font-size: 1.5rem; }
}