/* =====================================================
   泄密 - 全站样式表
   品牌色：玫瑰红 #E8437A | 深紫 #1A1A2E | 渐变
   字体：系统字体栈
   ===================================================== */

/* ---- CSS 变量 ---- */
:root {
  --primary: #E8437A;
  --primary-dark: #C73265;
  --secondary: #7B61FF;
  --accent: #FF6B6B;
  --bg-dark: #1A1A2E;
  --bg-dark2: #2D2D4E;
  --text: #1A1A2E;
  --text-muted: #666;
  --border: #EEEEF5;
  --white: #fff;
  --gradient: linear-gradient(135deg, #E8437A 0%, #FF6B6B 100%);
  --gradient2: linear-gradient(135deg, #7B61FF 0%, #E8437A 100%);
  --shadow: 0 4px 24px rgba(232, 67, 122, 0.12);
  --shadow-lg: 0 8px 40px rgba(232, 67, 122, 0.18);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --container: 1200px;
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "微软雅黑", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: #F8F8FC;
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: var(--gradient);
  color: #fff;
  text-align: center;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.3px;
}
.top-bar a {
  color: #fff;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ---- 导航栏 ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
  height: var(--header-h);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.logo-img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 2px 8px rgba(232, 67, 122, 0.25);
}
.logo-text {
  font-size: 22px;
  font-weight: 900;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
  white-space: nowrap;
}

/* 导航链接 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.site-nav a {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--primary);
  background: rgba(232, 67, 122, 0.08);
}
.site-nav .nav-cta {
  background: var(--gradient);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 20px;
  margin-left: 8px;
  font-size: 13px;
}
.site-nav .nav-cta:hover {
  background: linear-gradient(135deg, #C73265, #E8437A);
  opacity: 0.95;
}

/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: #F4F4F8;
  border-radius: 24px;
  padding: 0 16px;
  gap: 8px;
  flex-shrink: 0;
  border: 1.5px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.header-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 67, 122, 0.12);
  background: #fff;
}
.header-search input {
  border: none;
  background: transparent;
  outline: none;
  font-size: 13px;
  width: 180px;
  padding: 10px 0;
  color: var(--text);
}
.header-search button {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  transition: color var(--transition);
}
.header-search button:hover { color: var(--primary); }

/* 汉堡菜单 */
.hamburger {
  display: none;
  font-size: 22px;
  color: var(--text);
  padding: 8px;
  border-radius: 8px;
  margin-left: auto;
}

/* ---- 容器 ---- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- 通用 Section ---- */
.section {
  padding: 72px 0;
}
.section-alt {
  background: #fff;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  background: rgba(232, 67, 122, 0.1);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: 32px;
  font-weight: 900;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-header p {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- Hero ---- */
.hero-section {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--bg-dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('../images/hero_banner.jpg') center/cover no-repeat;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.92) 0%, rgba(232,67,122,0.45) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--container);
  margin: 0 auto;
  padding: 80px 24px;
  color: #fff;
}
.hero-badge {
  display: inline-block;
  background: rgba(232,67,122,0.25);
  border: 1px solid rgba(232,67,122,0.5);
  color: #FFB3CC;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.hero-content h1 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-content h1 span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content > p {
  font-size: 16px;
  color: rgba(255,255,255,0.8);
  max-width: 560px;
  line-height: 1.8;
  margin-bottom: 32px;
}
.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.hero-stat .num {
  font-size: 28px;
  font-weight: 900;
  color: #fff;
}
.hero-stat .label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin-top: 2px;
}

/* ---- 按钮 ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  padding: 13px 28px;
  border-radius: 28px;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 16px rgba(232,67,122,0.35);
  white-space: nowrap;
  text-decoration: none;
}
.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(232,67,122,0.45);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 28px;
  border: 2px solid rgba(255,255,255,0.5);
  transition: border-color var(--transition), background var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.btn-outline:hover {
  border-color: #fff;
  background: rgba(255,255,255,0.1);
}
.btn-sm {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 20px;
  transition: all var(--transition);
  cursor: pointer;
}
.btn-sm-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 2px 8px rgba(232,67,122,0.25);
}
.btn-sm-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-sm-outline {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}
.btn-sm-outline:hover { background: rgba(232,67,122,0.08); }

/* ---- 面包屑 ---- */
.breadcrumb {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.breadcrumb-list {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.breadcrumb-list a {
  color: var(--primary);
  font-weight: 600;
}
.breadcrumb-list a:hover { text-decoration: underline; }
.sep { color: #ccc; }

/* ---- 功能卡片 ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.feature-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
  transition: transform var(--transition), box-shadow var(--transition);
  text-align: center;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, rgba(232,67,122,0.1), rgba(123,97,255,0.1));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin: 0 auto 20px;
}
.feature-card h3 {
  font-size: 17px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text);
}
.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- 视频网格 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.video-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  transition: transform var(--transition), box-shadow var(--transition);
  display: block;
  text-decoration: none;
  color: inherit;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #1A1A2E;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img {
  transform: scale(1.06);
}
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.25);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.video-play-btn svg {
  width: 52px;
  height: 52px;
  fill: rgba(255,255,255,0.92);
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.4));
}
.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--gradient);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
  letter-spacing: 0.3px;
}
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
}
.video-info {
  padding: 16px 18px 18px;
}
.video-info h3 {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 10px;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.video-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.video-tag {
  background: rgba(232,67,122,0.08);
  color: var(--primary);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 10px;
}

/* ---- 筛选栏 ---- */
.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.filter-btn {
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  background: #fff;
  border: 1.5px solid var(--border);
  transition: all var(--transition);
  cursor: pointer;
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(232,67,122,0.25);
}

/* ---- 专家卡片 ---- */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.07);
  transition: transform var(--transition), box-shadow var(--transition);
}
.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.expert-avatar {
  width: 100%;
  height: 220px;
  object-fit: cover;
}
.expert-info {
  padding: 20px;
}
.expert-info h3 {
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 4px;
}
.expert-title {
  font-size: 12px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 10px;
}
.expert-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}
.expert-awards {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.expert-award {
  background: rgba(232,67,122,0.08);
  color: var(--primary);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 10px;
}
.expert-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ---- 合作伙伴 ---- */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.partner-logo {
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  transition: border-color var(--transition), color var(--transition), box-shadow var(--transition);
  cursor: default;
}
.partner-logo:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow);
}

/* ---- 加入步骤 ---- */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  position: relative;
  counter-increment: step;
}
.howto-step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: -14px;
  left: 24px;
  background: var(--gradient);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 12px;
}
.howto-step h4 {
  font-size: 15px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text);
}
.howto-step p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---- 评价 ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  transition: transform var(--transition);
}
.review-card:hover { transform: translateY(-4px); }
.review-stars {
  color: #FFB347;
  font-size: 18px;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
  font-style: italic;
}
.reviewer {
  display: flex;
  align-items: center;
  gap: 12px;
}
.reviewer-avatar {
  width: 40px;
  height: 40px;
  background: var(--gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 16px;
  flex-shrink: 0;
}
.reviewer-name {
  font-size: 14px;
  font-weight: 700;
}
.reviewer-tag {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ---- FAQ ---- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: color var(--transition);
  gap: 16px;
}
.faq-question:hover { color: var(--primary); }
.faq-question.active { color: var(--primary); }
.faq-icon {
  width: 28px;
  height: 28px;
  background: rgba(232,67,122,0.1);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
  transition: transform var(--transition), background var(--transition);
}
.faq-question.active .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #fff;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-answer.open {
  max-height: 400px;
  padding: 0 24px 20px;
}

/* ---- 联系卡片 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.contact-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  transition: transform var(--transition);
}
.contact-card:hover { transform: translateY(-4px); }
.contact-icon {
  font-size: 32px;
  margin-bottom: 14px;
}
.contact-card h3 {
  font-size: 16px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text);
}
.contact-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.qrcode-wrap {
  margin-top: 12px;
}
.qrcode-wrap img {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

/* ---- 视频详情页 ---- */
.video-detail-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 32px;
  align-items: flex-start;
}
.video-player-wrap {
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16/9;
}
.danmaku-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fff;
  border-radius: 10px;
  padding: 10px 16px;
  margin-top: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
}
.danmaku-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 14px;
  background: transparent;
  color: var(--text);
}
.danmaku-send {
  background: var(--gradient);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 16px;
  cursor: pointer;
  transition: opacity var(--transition);
}
.danmaku-send:hover { opacity: 0.9; }
.video-detail-info {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 16px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
.video-detail-info h1 {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 12px;
}
.video-detail-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.video-detail-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}
.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.related-item {
  display: flex;
  gap: 12px;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  transition: transform var(--transition);
}
.related-item:hover { transform: translateX(4px); }
.related-thumb {
  width: 100px;
  height: 64px;
  object-fit: cover;
  flex-shrink: 0;
}
.related-info {
  padding: 10px 12px 10px 0;
  flex: 1;
  min-width: 0;
}
.related-info h4 {
  font-size: 13px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 4px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-info span {
  font-size: 12px;
  color: var(--text-muted);
}

/* ---- 页面Hero（内页）---- */
.page-hero {
  background: var(--bg-dark);
  color: #fff;
  padding: 64px 0;
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  margin-bottom: 12px;
}
.page-hero p {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---- 分享栏 ---- */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  border: 1.5px solid var(--border);
  color: var(--text-muted);
  background: #fff;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
}
.share-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(232,67,122,0.06);
}

/* ---- 页脚 ---- */
.site-footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.75);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  margin-bottom: 20px;
}
.footer-qrcodes {
  display: flex;
  gap: 16px;
}
.footer-qr img {
  width: 72px;
  height: 72px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.15);
}
.footer-qr p {
  font-size: 12px;
  text-align: center;
  margin-top: 6px;
  color: rgba(255,255,255,0.5);
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col a {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 20px 24px;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
  flex-wrap: wrap;
}
.footer-bottom a {
  color: rgba(255,255,255,0.4);
  transition: color var(--transition);
}
.footer-bottom a:hover { color: var(--primary); }

/* ---- 工具类 ---- */
.text-center { text-align: center; }
.mt-8 { margin-top: 32px; }

/* ---- 响应式 ---- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .video-detail-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root { --header-h: 64px; }

  .hamburger { display: flex; }

  .site-nav {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    z-index: 999;
  }
  .site-nav.open { display: flex; }
  .site-nav a {
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
  }
  .site-nav .nav-cta { text-align: center; }

  .header-search { display: none; }

  .hero-content { padding: 60px 24px; }
  .hero-stats { gap: 24px; }
  .hero-buttons { flex-direction: column; align-items: flex-start; }

  .section { padding: 48px 0; }
  .section-header h2 { font-size: 24px; }

  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 10px;
    text-align: center;
  }

  .experts-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .video-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .hero-content h1 { font-size: 28px; }
  .section-header h2 { font-size: 22px; }
  .feature-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---- 打印样式 ---- */
@media print {
  .site-header, .top-bar, .site-footer, .share-bar, .filter-bar { display: none; }
  .section { padding: 20px 0; }
}