/* ============================================================
   桃子视频 - 全站公共样式
   配色：蜜桃粉 + 暖橙 + 深紫黑
   ============================================================ */

:root {
  --color-primary: #FF6B8A;
  --color-primary-dark: #E8557A;
  --color-accent: #FFB347;
  --color-accent-dark: #F59E0B;
  --color-bg: #FFF8F4;
  --color-bg-alt: #FFF0E8;
  --color-surface: #FFFFFF;
  --color-text: #2D1B2E;
  --color-text-muted: #6B5A6E;
  --color-border: #F5E3DE;
  --color-dark: #1A1423;
  --color-dark-2: #241A33;
  --shadow-sm: 0 2px 8px rgba(45, 27, 46, 0.06);
  --shadow-md: 0 8px 24px rgba(45, 27, 46, 0.10);
  --shadow-lg: 0 16px 48px rgba(45, 27, 46, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;
  --max-width: 1200px;
  --transition: all .3s cubic-bezier(.4, 0, .2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; transition: var(--transition); }

ul, ol { list-style: none; }

h1, h2, h3, h4 { line-height: 1.35; font-weight: 700; color: var(--color-dark); }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.3rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.4rem); }
p  { color: var(--color-text-muted); }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ======= 通用按钮 ======= */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  border: none; cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  box-shadow: 0 6px 20px rgba(255, 107, 138, 0.35);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(255, 107, 138, 0.45); }
.btn-outline {
  background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.7);
}
.btn-outline:hover { background: #fff; color: var(--color-primary-dark); }
.btn-dark {
  background: var(--color-dark); color: #fff;
}
.btn-dark:hover { background: var(--color-primary); transform: translateY(-2px); }

/* ======= 顶部导航 ======= */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255, 248, 244, 0.92);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.nav-wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 1.25rem; color: var(--color-dark);
}
.brand .logo-mark {
  width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: grid; place-items: center; color: #fff; font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(255, 107, 138, .35);
}
.brand .brand-sub { font-size: .72rem; color: var(--color-text-muted); font-weight: 400; display: block; }

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 8px 16px; border-radius: var(--radius-full);
  font-weight: 500; color: var(--color-text-muted); font-size: .95rem;
}
.main-nav a:hover,
.main-nav a.active { color: var(--color-primary-dark); background: var(--color-bg-alt); }

.nav-actions { display: flex; align-items: center; gap: 10px; }

.search-box {
  position: relative;
  display: flex; align-items: center;
  background: #fff; border: 1px solid var(--color-border);
  border-radius: var(--radius-full); padding: 0 14px;
  transition: var(--transition);
}
.search-box:focus-within { border-color: var(--color-primary); box-shadow: 0 0 0 4px rgba(255,107,138,.12); }
.search-box input {
  border: none; outline: none; background: transparent;
  padding: 10px 8px; font-size: .92rem; width: 160px; color: var(--color-text);
}
.search-box input::placeholder { color: #B9A6B5; }
.search-box .search-btn {
  border: none; background: transparent; cursor: pointer; color: var(--color-primary); font-size: 1rem;
}

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px; background: var(--color-dark); border-radius: 2px;
  transition: var(--transition);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ======= Hero 主视觉 ======= */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #2D1B2E 0%, #4A2040 50%, #1A1423 100%);
  color: #fff; padding: 80px 0 100px;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(255,107,138,.35), transparent 45%),
              radial-gradient(circle at 15% 85%, rgba(255,179,71,.25), transparent 45%);
  pointer-events: none;
}
.hero-grid {
  position: relative; display: grid; grid-template-columns: 1.1fr 1fr; gap: 50px; align-items: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,107,138,.18); border: 1px solid rgba(255,107,138,.4);
  color: #FFD0DA; padding: 6px 16px; border-radius: var(--radius-full);
  font-size: .85rem; margin-bottom: 20px;
}
.hero-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: #FF6B8A; box-shadow: 0 0 0 4px rgba(255,107,138,.3); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{box-shadow:0 0 0 4px rgba(255,107,138,.3);} 50%{box-shadow:0 0 0 8px rgba(255,107,138,.1);} }

.hero h1 { color: #fff; margin-bottom: 18px; }
.hero h1 .accent { background: linear-gradient(135deg, #FF9EAD, #FFB347); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { color: rgba(255,255,255,.78); font-size: 1.1rem; margin-bottom: 32px; max-width: 520px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-stats { display: flex; gap: 36px; margin-top: 48px; flex-wrap: wrap; }
.hero-stats .stat strong { display: block; font-size: 1.8rem; font-weight: 800; color: #FFB347; }
.hero-stats .stat span { font-size: .85rem; color: rgba(255,255,255,.65); }

.hero-visual { position: relative; }
.hero-card {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg); padding: 18px; backdrop-filter: blur(10px);
  box-shadow: var(--shadow-lg);
}
.hero-card .play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 72px; height: 72px; border-radius: 50%;
  background: rgba(255,107,138,.85); display: grid; place-items: center; color: #fff;
  font-size: 1.6rem; box-shadow: 0 0 0 8px rgba(255,107,138,.25); cursor: pointer;
  transition: var(--transition);
}
.hero-card .play-btn:hover { transform: translate(-50%, -50%) scale(1.08); background: var(--color-primary); }
.hero-card img { border-radius: var(--radius-md); aspect-ratio: 16/10; object-fit: cover; width: 100%; }
.hero-card .card-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 14px; }
.hero-card .card-title { font-weight: 700; }
.hero-card .card-rating { color: #FFB347; font-weight: 700; font-size: .9rem; }

.float-badge {
  position: absolute; background: #fff; color: var(--color-dark);
  border-radius: 14px; padding: 10px 16px; box-shadow: var(--shadow-md);
  font-size: .85rem; font-weight: 600; display: flex; align-items: center; gap: 8px;
}
.float-badge.b1 { top: -14px; right: -10px; }
.float-badge.b2 { bottom: 30px; left: -18px; }
.float-badge .emoji { font-size: 1.1rem; }

/* ======= 通用 section ======= */
section { padding: 80px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .eyebrow {
  display: inline-block; color: var(--color-primary-dark); font-weight: 700;
  letter-spacing: 2px; font-size: .82rem; text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { margin-bottom: 14px; }
.section-head p { font-size: 1.02rem; }

/* ======= 核心特性 ======= */
.features { background: var(--color-surface); }
.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px;
}
.feature-card {
  background: var(--color-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: 32px 26px;
  transition: var(--transition); position: relative; overflow: hidden;
}
.feature-card::after {
  content: ""; position: absolute; top: -40px; right: -40px;
  width: 120px; height: 120px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  opacity: 0; transition: var(--transition);
}
.feature-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-card:hover::after { opacity: .08; }
.feature-icon {
  width: 56px; height: 56px; border-radius: 16px;
  background: linear-gradient(135deg, #FFE0E8, #FFD9B8);
  display: grid; place-items: center; font-size: 1.6rem; margin-bottom: 18px;
  position: relative; z-index: 1;
}
.feature-card h3 { margin-bottom: 10px; }
.feature-card p { font-size: .94rem; }

/* ======= 服务 / 分类 ======= */
.services { background: var(--color-bg-alt); }
.cat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 22px;
}
.cat-card {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  aspect-ratio: 4/5; cursor: pointer; box-shadow: var(--shadow-sm);
}
.cat-card img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.cat-card:hover img { transform: scale(1.08); }
.cat-card .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(26,20,35,.92) 0%, rgba(26,20,35,.2) 60%, transparent 100%);
  display: flex; flex-direction: column; justify-content: flex-end; padding: 22px; color: #fff;
}
.cat-card h3 { color: #fff; margin-bottom: 4px; }
.cat-card span { font-size: .85rem; opacity: .85; }
.cat-card .cat-count {
  position: absolute; top: 14px; right: 14px;
  background: rgba(255,107,138,.9); color: #fff; font-size: .75rem; font-weight: 700;
  padding: 5px 12px; border-radius: var(--radius-full);
}

/* ======= 内容区 / 片库 ======= */
.content-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 36px; flex-wrap: wrap; }
.tab-btn {
  padding: 9px 22px; border-radius: var(--radius-full); border: 1px solid var(--color-border);
  background: #fff; cursor: pointer; font-weight: 500; color: var(--color-text-muted); font-size: .9rem;
  transition: var(--transition);
}
.tab-btn.active, .tab-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.movie-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 22px;
}
.movie-card {
  background: #fff; border-radius: var(--radius-md); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: var(--transition); cursor: pointer;
}
.movie-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.movie-card .poster { position: relative; aspect-ratio: 3/4; overflow: hidden; }
.movie-card .poster img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.movie-card:hover .poster img { transform: scale(1.06); }
.movie-card .badge {
  position: absolute; top: 10px; left: 10px;
  background: var(--color-primary); color: #fff; font-size: .7rem; font-weight: 700;
  padding: 4px 10px; border-radius: var(--radius-full);
}
.movie-card .play-overlay {
  position: absolute; inset: 0; background: rgba(26,20,35,.4);
  display: grid; place-items: center; opacity: 0; transition: var(--transition);
}
.movie-card:hover .play-overlay { opacity: 1; }
.movie-card .play-overlay .pbtn {
  width: 52px; height: 52px; border-radius: 50%; background: var(--color-primary); color: #fff;
  display: grid; place-items: center; font-size: 1.2rem; transform: scale(.7); transition: var(--transition);
}
.movie-card:hover .play-overlay .pbtn { transform: scale(1); }
.movie-info { padding: 14px; }
.movie-info h4 { font-size: .98rem; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.movie-meta { display: flex; justify-content: space-between; align-items: center; font-size: .8rem; color: var(--color-text-muted); }
.movie-meta .rating { color: var(--color-accent-dark); font-weight: 700; }

/* ======= FAQ ======= */
.faq-section { background: var(--color-bg-alt); }
.faq-list { max-width: 820px; margin: 0 auto; }
.faq-item {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-md);
  margin-bottom: 14px; overflow: hidden; transition: var(--transition);
}
.faq-item.open { box-shadow: var(--shadow-md); border-color: var(--color-primary); }
.faq-q {
  padding: 18px 22px; display: flex; justify-content: space-between; align-items: center;
  cursor: pointer; font-weight: 600; color: var(--color-dark);
}
.faq-q .icon {
  width: 28px; height: 28px; border-radius: 50%; background: var(--color-bg-alt);
  display: grid; place-items: center; color: var(--color-primary); font-size: 1rem;
  transition: var(--transition); flex-shrink: 0; margin-left: 12px;
}
.faq-item.open .faq-q .icon { background: var(--color-primary); color: #fff; transform: rotate(45deg); }
.faq-a {
  max-height: 0; overflow: hidden; transition: max-height .35s ease, padding .35s ease;
  padding: 0 22px; color: var(--color-text-muted); font-size: .95rem;
}
.faq-item.open .faq-a { max-height: 400px; padding: 0 22px 18px; }

/* ======= CTA ======= */
.cta {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #fff; text-align: center; position: relative; overflow: hidden;
}
.cta::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 20% 30%, rgba(255,255,255,.18), transparent 40%),
              radial-gradient(circle at 80% 70%, rgba(255,255,255,.12), transparent 40%);
}
.cta .container { position: relative; }
.cta h2 { color: #fff; margin-bottom: 14px; }
.cta p { color: rgba(255,255,255,.9); font-size: 1.08rem; margin-bottom: 30px; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ======= 页脚 ======= */
.site-footer {
  background: var(--color-dark); color: rgba(255,255,255,.72); padding: 64px 0 24px;
}
.footer-grid {
  display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; margin-bottom: 48px;
}
.footer-brand .brand { color: #fff; margin-bottom: 16px; }
.footer-brand p { color: rgba(255,255,255,.6); font-size: .92rem; max-width: 300px; }
.footer-col h4 { color: #fff; margin-bottom: 18px; font-size: 1rem; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: rgba(255,255,255,.62); font-size: .92rem; }
.footer-col a:hover { color: var(--color-accent); padding-left: 4px; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding-top: 22px; display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px; font-size: .85rem; color: rgba(255,255,255,.5);
}

/* ======= 面包屑 ======= */
.breadcrumb {
  background: var(--color-bg-alt); padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb ol { display: flex; gap: 8px; flex-wrap: wrap; font-size: .9rem; color: var(--color-text-muted); }
.breadcrumb a:hover { color: var(--color-primary-dark); }
.breadcrumb .sep { opacity: .5; }

/* ======= 页面头（内页） ======= */
.page-hero {
  background: linear-gradient(135deg, #2D1B2E, #1A1423);
  color: #fff; padding: 70px 0; text-align: center; position: relative; overflow: hidden;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 50%, rgba(255,107,138,.3), transparent 50%);
}
.page-hero .container { position: relative; }
.page-hero h1 { color: #fff; margin-bottom: 12px; }
.page-hero p { color: rgba(255,255,255,.75); max-width: 640px; margin: 0 auto; }

/* ======= 关于页 ======= */
.about-section { background: #fff; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.about-grid img { border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.about-text .eyebrow { color: var(--color-primary-dark); font-weight: 700; letter-spacing: 2px; font-size: .82rem; text-transform: uppercase; }
.about-text h2 { margin: 10px 0 18px; }
.about-text p { margin-bottom: 14px; }
.milestone-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px,1fr)); gap: 20px; margin-top: 40px; }
.milestone { background: var(--color-bg); border-radius: var(--radius-md); padding: 24px; text-align: center; }
.milestone strong { display: block; font-size: 2rem; color: var(--color-primary-dark); font-weight: 800; }
.milestone span { font-size: .85rem; color: var(--color-text-muted); }

.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 24px; }
.team-card { background: #fff; border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-sm); text-align: center; transition: var(--transition); }
.team-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.team-card img { aspect-ratio: 1/1; object-fit: cover; width: 100%; }
.team-card .info { padding: 18px; }
.team-card h4 { margin-bottom: 4px; }
.team-card .role { color: var(--color-primary-dark); font-size: .85rem; font-weight: 600; }

/* ======= 联系页 ======= */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; align-items: start; }
.contact-info .info-card {
  display: flex; gap: 16px; padding: 20px; background: #fff;
  border-radius: var(--radius-md); margin-bottom: 16px; box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.contact-info .info-card:hover { transform: translateX(6px); box-shadow: var(--shadow-md); }
.contact-info .info-ico {
  width: 48px; height: 48px; border-radius: 12px; flex-shrink: 0;
  background: linear-gradient(135deg, #FFE0E8, #FFD9B8);
  display: grid; place-items: center; font-size: 1.3rem;
}
.contact-info .info-card h4 { margin-bottom: 4px; font-size: 1rem; }
.contact-info .info-card p { font-size: .9rem; margin: 0; }

.contact-form {
  background: #fff; padding: 32px; border-radius: var(--radius-lg); box-shadow: var(--shadow-md);
}
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .92rem; color: var(--color-dark); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  font-family: inherit; font-size: .95rem; background: var(--color-bg); transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--color-primary); background: #fff;
  box-shadow: 0 0 0 4px rgba(255,107,138,.12);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ======= 资讯列表 ======= */
.news-section { background: var(--color-bg); }
.news-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 28px; }
.news-card {
  background: #fff; border-radius: var(--radius-md); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: var(--transition);
}
.news-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.news-card .thumb { aspect-ratio: 16/9; overflow: hidden; }
.news-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.news-card:hover .thumb img { transform: scale(1.06); }
.news-body { padding: 20px; }
.news-meta { display: flex; gap: 14px; font-size: .8rem; color: var(--color-text-muted); margin-bottom: 10px; }
.news-meta .cat-tag { color: var(--color-primary-dark); font-weight: 600; }
.news-body h3 { margin-bottom: 10px; font-size: 1.1rem; }
.news-body p { font-size: .9rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.read-more { color: var(--color-primary-dark); font-weight: 600; font-size: .9rem; margin-top: 14px; display: inline-flex; align-items: center; gap: 4px; }
.read-more:hover { gap: 8px; }

.pagination { display: flex; justify-content: center; gap: 8px; margin-top: 50px; }
.pagination a {
  width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center;
  background: #fff; border: 1px solid var(--color-border); color: var(--color-text-muted); font-weight: 600;
}
.pagination a.active, .pagination a:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ======= 资讯详情 ======= */
.article { background: #fff; max-width: 820px; margin: 0 auto; padding: 40px; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); }
.article .article-meta { display: flex; gap: 16px; font-size: .88rem; color: var(--color-text-muted); margin-bottom: 20px; flex-wrap: wrap; }
.article .article-meta .cat-tag { color: var(--color-primary-dark); font-weight: 600; }
.article h1 { margin-bottom: 14px; }
.article .lead { font-size: 1.1rem; color: var(--color-text); margin-bottom: 24px; font-weight: 500; }
.article .cover { border-radius: var(--radius-md); margin-bottom: 28px; overflow: hidden; }
.article .cover img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.article p { margin-bottom: 18px; font-size: 1rem; }
.article h2 { margin: 30px 0 14px; font-size: 1.5rem; }
.article h3 { margin: 24px 0 10px; font-size: 1.2rem; }
.article blockquote {
  border-left: 4px solid var(--color-primary); padding: 14px 22px;
  background: var(--color-bg-alt); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0; color: var(--color-text); font-style: italic;
}
.article-share { display: flex; gap: 12px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--color-border); }
.article-share span { align-self: center; font-weight: 600; margin-right: 8px; }
.share-btn {
  width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center;
  background: var(--color-bg-alt); color: var(--color-text-muted); transition: var(--transition);
}
.share-btn:hover { background: var(--color-primary); color: #fff; transform: translateY(-3px); }

/* ======= 滚动动画 ======= */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ======= 返回顶部 ======= */
.back-top {
  position: fixed; right: 24px; bottom: 24px; z-index: 999;
  width: 48px; height: 48px; border-radius: 50%; border: none; cursor: pointer;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff; font-size: 1.2rem; box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transition: var(--transition);
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-4px); }

/* ======= 响应式 ======= */
@media (max-width: 960px) {
  .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-visual { margin-top: 30px; }
}

@media (max-width: 768px) {
  section { padding: 56px 0; }
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed; top: 72px; left: 0; right: 0;
    flex-direction: column; background: #fff; padding: 16px; gap: 4px;
    border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-md);
    transform: translateY(-120%); transition: transform .35s ease;
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { width: 100%; padding: 12px 16px; }
  .nav-actions .search-box { display: none; }
  .nav-actions .btn { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .form-row { grid-template-columns: 1fr; }
  .hero { padding: 50px 0 70px; }
  .hero-stats { gap: 24px; }
  .hero-stats .stat strong { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
}