/* ===================================================
   高清无码官方平台 - 主样式文件
   uwszfov.cn | 高清无码视频 | 高清无码视频 | 高清无码社区
   =================================================== */

/* ---- CSS 变量 ---- */
:root {
  --primary: #FF6B00;
  --primary-dark: #cc5500;
  --primary-light: #ff8c33;
  --bg-base: #0f0f0f;
  --bg-card: #1e1e1e;
  --bg-card2: #141414;
  --border: #2a2a2a;
  --text-main: #f0f0f0;
  --text-sub: #aaaaaa;
  --text-muted: #666666;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 4px 20px rgba(0,0,0,.5);
  --transition: .25s ease;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg-base);
  color: var(--text-main);
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }
h1,h2,h3,h4,h5,h6 { line-height: 1.3; }

/* ---- 顶部公告栏 ---- */
.top-bar {
  background: #1a0800;
  color: #aaa;
  font-size: .78rem;
  text-align: center;
  padding: 7px 16px;
  border-bottom: 1px solid #2a0000;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---- 导航栏 ---- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15,15,15,.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 5%;
  height: 60px;
  transition: box-shadow var(--transition);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.nav-logo img { width: 36px; height: 36px; border-radius: 8px; }
.nav-logo-text {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--primary);
  letter-spacing: -1px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  flex-wrap: nowrap;
  overflow: hidden;
}
.nav-menu a {
  color: var(--text-sub);
  font-size: .85rem;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 6px;
  white-space: nowrap;
  transition: all var(--transition);
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
  background: rgba(255,107,0,.1);
}
.nav-search {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
  flex-shrink: 0;
  transition: border-color var(--transition);
}
.nav-search:focus-within { border-color: var(--primary); }
.nav-search input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: .82rem;
  padding: 6px 12px;
  width: 180px;
}
.nav-search button {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 6px 12px;
  font-size: .9rem;
  transition: color var(--transition);
}
.nav-search button:hover { color: var(--primary); }
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  cursor: pointer;
  flex-shrink: 0;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-sub);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav-hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-hamburger.active span:nth-child(2) { opacity: 0; }
.nav-hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 12px 5%;
  font-size: .8rem;
  color: var(--text-muted);
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }

/* ---- 页面Hero（内页） ---- */
.page-hero {
  background: linear-gradient(135deg, #141414 0%, #1a0800 100%);
  padding: 50px 5%;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
}
.page-hero h1 span { color: var(--primary); }
.page-hero p { color: var(--text-sub); font-size: .95rem; max-width: 700px; line-height: 1.8; }

/* ---- Hero / Banner ---- */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,0,0,.88) 0%, rgba(20,8,0,.75) 50%, rgba(0,0,0,.6) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 80px 5% 60px;
  max-width: 1300px;
  width: 100%;
}
.hero-badge {
  display: inline-block;
  background: rgba(255,107,0,.15);
  border: 1px solid rgba(255,107,0,.3);
  color: var(--primary);
  font-size: .82rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.hero-content h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-content h1 span { color: var(--primary); }
.hero-desc {
  font-size: clamp(.9rem, 1.5vw, 1.05rem);
  color: #ccc;
  max-width: 620px;
  line-height: 1.9;
  margin-bottom: 28px;
}
.hero-stats {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.hero-stat {
  display: flex;
  flex-direction: column;
}
.hero-stat strong {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1;
}
.hero-stat span { font-size: .78rem; color: #888; margin-top: 4px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---- 按钮 ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary);
  color: #fff;
  font-size: .9rem;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 8px;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,107,0,.4);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  color: #fff;
  font-size: .9rem;
  font-weight: 700;
  padding: 11px 28px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.3);
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255,107,0,.08);
}
.btn-sm {
  font-size: .8rem;
  font-weight: 700;
  padding: 7px 16px;
  border-radius: 6px;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-sm-primary { background: var(--primary); color: #fff; }
.btn-sm-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-sm-outline { background: transparent; color: var(--text-sub); border: 1px solid var(--border); }
.btn-sm-outline:hover { border-color: var(--primary); color: var(--primary); }

/* ---- Section 通用 ---- */
.section {
  padding: 60px 5%;
  max-width: 1300px;
  margin: 0 auto;
}
.section-full { width: 100%; }
.section-full .section { max-width: 1300px; margin: 0 auto; padding: 60px 5%; }
.section-header { text-align: center; margin-bottom: 40px; }
.section-tag {
  display: inline-block;
  background: rgba(255,107,0,.12);
  color: var(--primary);
  font-size: .78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  border: 1px solid rgba(255,107,0,.25);
  margin-bottom: 12px;
}
.section-header h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
}
.section-header p { color: var(--text-sub); font-size: .9rem; max-width: 650px; margin: 0 auto; line-height: 1.8; }
.divider {
  width: 50px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
  margin: 16px auto 0;
}

/* ---- 筛选栏 ---- */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: .82rem;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 20px;
  transition: all var(--transition);
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ---- 视频网格 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

/* ---- 视频卡片 ---- */
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}
.video-card:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(255,107,0,.2);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #111;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }

/* 播放按钮 - 核心交互 */
.video-play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: background var(--transition);
}
.video-card:hover .video-play-btn {
  background: rgba(0,0,0,.45);
}
.play-icon {
  width: 52px;
  height: 52px;
  background: rgba(255,107,0,.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(.7);
  transition: all var(--transition);
  position: relative;
}
.play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 9px 0 9px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-card:hover .play-icon {
  opacity: 1;
  transform: scale(1);
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.8);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-cat-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 14px; }
.video-info h3 {
  font-size: .88rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  gap: 12px;
  font-size: .75rem;
  color: var(--text-muted);
}

/* ---- 模块卡片 ---- */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.module-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.module-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 6px 24px rgba(255,107,0,.15);
}
.module-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}
.module-card h3 {
  font-size: .95rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}
.module-card p { font-size: .83rem; color: var(--text-sub); line-height: 1.7; }

/* ---- AI 区块 ---- */
.ai-section { background: linear-gradient(135deg, #0f0f0f 0%, #0a0500 100%); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.ai-card {
  background: rgba(255,107,0,.04);
  border: 1px solid rgba(255,107,0,.15);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.ai-card:hover {
  background: rgba(255,107,0,.08);
  border-color: var(--primary);
  transform: translateY(-4px);
}
.ai-card-icon { font-size: 2rem; margin-bottom: 14px; }
.ai-card h3 { font-size: .95rem; font-weight: 800; color: var(--text-main); margin-bottom: 10px; }
.ai-card p { font-size: .83rem; color: var(--text-sub); line-height: 1.7; }

/* ---- 社区 Tab ---- */
.community-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: .85rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 6px;
  transition: all var(--transition);
}
.tab-btn:hover,
.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition);
}
.expert-card:hover {
  border-color: var(--primary);
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(255,107,0,.15);
}
.expert-avatar {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  object-position: top;
}
.expert-info { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.expert-info h3 { font-size: 1.05rem; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
.expert-role { font-size: .8rem; color: var(--primary); font-weight: 600; margin-bottom: 10px; }
.expert-bio { font-size: .82rem; color: var(--text-sub); line-height: 1.7; margin-bottom: 14px; flex: 1; }
.expert-stats {
  display: flex;
  gap: 16px;
  margin-bottom: 14px;
  padding: 12px;
  background: var(--bg-card2);
  border-radius: 8px;
}
.expert-stat { display: flex; flex-direction: column; align-items: center; flex: 1; }
.expert-stat strong { font-size: .95rem; font-weight: 800; color: var(--primary); }
.expert-stat span { font-size: .72rem; color: var(--text-muted); }
.expert-btns { display: flex; gap: 8px; }

/* ---- 合作品牌 ---- */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.partner-logo {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 24px;
  font-size: .85rem;
  font-weight: 700;
  color: var(--text-sub);
  transition: all var(--transition);
  cursor: default;
}
.partner-logo:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(255,107,0,.05);
}

/* ---- 加入步骤 ---- */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  counter-reset: step;
}
.howto-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  counter-increment: step;
  transition: all var(--transition);
}
.howto-step:hover { border-color: var(--primary); }
.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -14px;
  left: 20px;
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: #fff;
  font-size: .8rem;
  font-weight: 900;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.howto-step h4 { font-size: .95rem; font-weight: 800; color: var(--text-main); margin-bottom: 10px; margin-top: 8px; }
.howto-step p { font-size: .83rem; color: var(--text-sub); line-height: 1.7; }

/* ---- 联系卡片 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.contact-card:hover { border-color: var(--primary); }
.contact-icon { font-size: 1.8rem; margin-bottom: 12px; }
.contact-card h4 { font-size: .95rem; font-weight: 800; color: var(--text-main); margin-bottom: 10px; }
.contact-card p { font-size: .83rem; color: var(--text-sub); line-height: 1.9; }

/* ---- 用户评价 ---- */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: all var(--transition);
}
.review-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.review-stars { color: #FFB800; font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: .85rem; color: var(--text-sub); line-height: 1.8; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 38px;
  height: 38px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: .9rem;
  font-weight: 800;
  flex-shrink: 0;
}
.review-author-info { display: flex; flex-direction: column; }
.review-author-info strong { font-size: .88rem; color: var(--text-main); }
.review-author-info span { font-size: .75rem; color: var(--text-muted); }

/* ---- FAQ ---- */
.faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item:hover { border-color: rgba(255,107,0,.4); }
.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: .92rem;
  font-weight: 700;
  text-align: left;
  padding: 18px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color var(--transition);
}
.faq-question::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--primary);
  flex-shrink: 0;
  transition: transform var(--transition);
}
.faq-question.active { color: var(--primary); }
.faq-question.active::after { transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .35s ease, padding .35s ease;
  padding: 0 20px;
}
.faq-answer.open {
  max-height: 600px;
  padding: 0 20px 18px;
}
.faq-answer p { font-size: .85rem; color: var(--text-sub); line-height: 1.9; }

/* ---- 分享栏 ---- */
.share-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 5%;
  background: var(--bg-card2);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.share-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: .78rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 16px;
  transition: all var(--transition);
  cursor: pointer;
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); }

/* ---- 底部 ---- */
.footer {
  background: #0a0a0a;
  border-top: 1px solid var(--border);
  padding: 50px 5% 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  max-width: 1300px;
  margin: 0 auto;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
}
.footer-brand p { font-size: .82rem; color: var(--text-muted); line-height: 1.8; margin-top: 14px; }
.footer-brand img { margin-bottom: 4px; }
.footer-qrcodes { display: flex; gap: 16px; margin-top: 16px; }
.footer-qr { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.footer-qr img { border-radius: 6px; border: 1px solid var(--border); }
.footer-qr span { font-size: .72rem; color: var(--text-muted); }
.footer-col h4 { font-size: .9rem; font-weight: 800; color: var(--text-main); margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 8px; }
.footer-col ul li a { font-size: .82rem; color: var(--text-muted); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--primary); }
.footer-bottom {
  max-width: 1300px;
  margin: 0 auto;
  padding: 20px 0;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-bottom p { font-size: .78rem; color: var(--text-muted); }
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--primary); }

/* ---- 视频模态框 ---- */
.video-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.9);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  position: relative;
  width: 100%;
  max-width: 900px;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
}
.video-modal-inner video { width: 100%; display: block; }
.video-modal-close {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0,0,0,.7);
  border: none;
  color: #fff;
  font-size: 1rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  z-index: 10;
  transition: background var(--transition);
}
.video-modal-close:hover { background: var(--primary); }

/* ---- MCP 占位 ---- */
.mcp-widget {
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  text-align: center;
}

/* ---- 动画 ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp .7s ease both; }
.delay-1 { animation-delay: .15s; }
.delay-2 { animation-delay: .3s; }
.delay-3 { animation-delay: .45s; }

/* ===================================================
   移动端适配
   =================================================== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-menu a { font-size: .8rem; padding: 6px 8px; }
}

@media (max-width: 768px) {
  .navbar { padding: 0 4%; gap: 10px; }
  .nav-menu {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(15,15,15,.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
  }
  .nav-menu.open { display: flex; }
  .nav-menu a { padding: 10px 14px; font-size: .9rem; border-radius: 8px; }
  .nav-hamburger { display: flex; }
  .nav-search { display: none; }

  .hero { min-height: 70vh; }
  .hero-content { padding: 60px 4% 40px; }
  .hero-stats { gap: 16px; }
  .hero-stat strong { font-size: 1.3rem; }

  .section { padding: 40px 4%; }
  .section-full .section { padding: 40px 4%; }

  .video-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
  .module-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .ai-features { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-qrcodes { justify-content: flex-start; }

  .page-hero { padding: 36px 4%; }
  .page-hero h1 { font-size: 1.6rem; }

  .share-bar { justify-content: flex-start; padding: 10px 4%; }
}

@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); display: grid; }
  .howto-steps { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: 1fr; }
  .filter-bar { gap: 6px; }
  .filter-btn { font-size: .78rem; padding: 6px 12px; }
}

/* ===================================================
   打印样式
   =================================================== */
@media print {
  .navbar, .top-bar, .share-bar, .footer, .video-play-btn, .nav-hamburger { display: none !important; }
  body { background: #fff; color: #000; }
}

/* ===================================================
   回到顶部按钮
   =================================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 1.1rem;
  font-weight: 900;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 900;
  box-shadow: 0 4px 16px rgba(255,107,0,.4);
  transition: background var(--transition), transform var(--transition);
}
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-3px); }
.back-to-top.visible { display: flex; }

/* ===================================================
   Toast 提示
   =================================================== */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(30,30,30,.95);
  color: #fff;
  font-size: .85rem;
  padding: 10px 22px;
  border-radius: 24px;
  border: 1px solid var(--border);
  opacity: 0;
  pointer-events: none;
  transition: all .3s ease;
  z-index: 9999;
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===================================================
   Footer 关键词标签区
   =================================================== */
.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 5%;
  border-bottom: 1px solid var(--border);
  background: #0d0d0d;
}
.footer-keywords a {
  color: #666;
  font-size: .75rem;
  padding: 3px 10px;
  border: 1px solid #222;
  border-radius: 20px;
  transition: all var(--transition);
}
.footer-keywords a:hover {
  color: var(--primary);
  border-color: var(--primary);
}

/* ===================================================
   视频模态框标题与描述
   =================================================== */
.video-modal-title {
  color: #fff;
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 12px;
  text-align: center;
  padding: 0 40px;
}

/* ===================================================
   视频卡片 description 文字
   =================================================== */
.video-card .video-info p {
  color: var(--text-muted);
  font-size: .78rem;
  margin-bottom: 8px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===================================================
   社区话题标签（首页社区区域）
   =================================================== */
.community-topic-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.community-topic-tags a {
  background: #1a1a1a;
  border: 1px solid var(--border);
  color: var(--text-sub);
  font-size: .82rem;
  padding: 6px 14px;
  border-radius: 20px;
  transition: all var(--transition);
}
.community-topic-tags a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ===================================================
   专家卡片按钮组
   =================================================== */
.expert-btns {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}

/* ===================================================
   移动端补充适配
   =================================================== */
@media (max-width: 768px) {
  .back-to-top { bottom: 20px; right: 16px; width: 40px; height: 40px; font-size: 1rem; }
  .footer-keywords { padding: 12px 4%; }
  .video-modal-title { font-size: .85rem; padding: 0 30px; }
}

@media (max-width: 480px) {
  .footer-keywords a { font-size: .7rem; padding: 3px 8px; }
}