/* =============================================
   溏心视频社区 - 全局样式
   域名: valmmzt.cn
   版本: 1.0.0
   ============================================= */

/* ---- CSS变量 ---- */
:root {
  --primary: #FF6B00;
  --primary-dark: #E05A00;
  --primary-light: #FF8C33;
  --dark: #0D1117;
  --dark2: #161B22;
  --dark3: #21262D;
  --dark4: #30363D;
  --text: #E6EDF3;
  --text-muted: #8B949E;
  --text-dim: #6E7681;
  --gold: #FFD700;
  --success: #3FB950;
  --border: #30363D;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-hover: 0 8px 40px rgba(255,107,0,0.25);
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  --font: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
}

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

/* ---- 通用容器 ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 0 20px; }

/* ---- 通用节 ---- */
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-tag {
  display: inline-block;
  background: rgba(255,107,0,0.15);
  color: var(--primary);
  border: 1px solid rgba(255,107,0,0.3);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 14px;
  line-height: 1.3;
}
.section-title span { color: var(--primary); }
.section-desc { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* ---- 导航栏 ---- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(13,17,23,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.site-nav.scrolled {
  background: rgba(13,17,23,0.98);
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo img { width: 44px; height: 44px; object-fit: contain; }
.nav-logo-text {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}
.nav-logo-text span { color: var(--primary); }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--text);
  background: var(--dark3);
}
.nav-menu a.active { color: var(--primary); }

/* 搜索框 */
.nav-search {
  display: flex;
  align-items: center;
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 200px;
  transition: var(--transition);
}
.nav-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255,107,0,0.15);
}
.nav-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.88rem;
  width: 100%;
}
.nav-search input::placeholder { color: var(--text-dim); }
.nav-search-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  padding: 0;
  display: flex;
  align-items: center;
}
.nav-search-btn:hover { color: var(--primary); }
.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 8px 18px !important;
  border-radius: 24px !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--primary-dark) !important; color: #fff !important; }
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- Hero Banner ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  filter: brightness(0.45);
  transform: scale(1.05);
  transition: transform 8s ease;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,17,23,0.85) 0%, rgba(13,17,23,0.4) 50%, rgba(255,107,0,0.1) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 120px 0 80px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,107,0,0.15);
  border: 1px solid rgba(255,107,0,0.4);
  color: var(--primary);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 20px;
  animation: fadeInDown 0.6s ease;
}
.hero-badge::before { content: '●'; font-size: 0.5rem; animation: pulse 1.5s infinite; }
.hero-h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  animation: fadeInUp 0.7s ease 0.1s both;
}
.hero-h1 .brand { color: var(--primary); }
.hero-h1 .sub { display: block; font-size: 0.55em; color: var(--text-muted); font-weight: 400; margin-top: 8px; }
.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 36px;
  animation: fadeInUp 0.7s ease 0.2s both;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 36px;
  margin-bottom: 40px;
  animation: fadeInUp 0.7s ease 0.3s both;
}
.hero-stat-item { text-align: center; }
.hero-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}
.hero-stat-label { font-size: 0.78rem; color: var(--text-muted); }
.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  animation: fadeInUp 0.7s ease 0.4s both;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  border: 2px solid transparent;
  cursor: pointer;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,107,0,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}
.btn-ghost {
  background: rgba(255,255,255,0.08);
  color: var(--text);
  border-color: transparent;
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.15);
  color: var(--text);
}

/* ---- 视频卡片 ---- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-grid-3 { grid-template-columns: repeat(3, 1fr); }
.video-grid-4 { grid-template-columns: repeat(4, 1fr); }
.video-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark3);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s 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(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.video-card:hover .video-play-btn { opacity: 1; }
.play-icon {
  width: 56px;
  height: 56px;
  background: rgba(255,107,0,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255,107,0,0.5);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-author { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 6px; }

/* ---- 媒体卡片 ---- */
.media-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.media-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.media-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
}
.media-card-img {
  aspect-ratio: 16/9;
  overflow: hidden;
}
.media-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.media-card:hover .media-card-img img { transform: scale(1.05); }
.media-card-body { padding: 16px; }
.media-card-tag {
  display: inline-block;
  background: rgba(255,107,0,0.12);
  color: var(--primary);
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
  margin-bottom: 8px;
}
.media-card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
  line-height: 1.4;
}
.media-card-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }

/* ---- 功能卡片 ---- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--primary);
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 52px;
  height: 52px;
  background: rgba(255,107,0,0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.feature-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.feature-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; }

/* ---- AI赋能模块 ---- */
.ai-section { background: linear-gradient(135deg, var(--dark2) 0%, var(--dark) 100%); }
.ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.ai-img { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.ai-img img { width: 100%; }
.ai-content { }
.ai-list { margin-top: 24px; display: flex; flex-direction: column; gap: 16px; }
.ai-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: var(--dark3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.ai-item:hover { border-color: var(--primary); }
.ai-item-icon {
  width: 40px;
  height: 40px;
  background: rgba(255,107,0,0.15);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.ai-item-text h4 { font-size: 0.92rem; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.ai-item-text p { font-size: 0.82rem; color: var(--text-muted); }

/* ---- 专家卡片 ---- */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.expert-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  text-align: center;
}
.expert-card:hover { transform: translateY(-4px); border-color: var(--primary); box-shadow: var(--shadow-hover); }
.expert-avatar {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
}
.expert-avatar img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.expert-card:hover .expert-avatar img { transform: scale(1.05); }
.expert-badge-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  padding: 20px 12px 10px;
}
.expert-role {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 700;
}
.expert-body { padding: 16px; }
.expert-name { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.expert-title { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 10px; }
.expert-stats {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.expert-stats strong { color: var(--primary); }
.expert-awards { font-size: 0.78rem; color: var(--gold); margin-bottom: 12px; }
.expert-social {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}
.expert-social a {
  width: 28px; height: 28px;
  background: var(--dark3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  transition: var(--transition);
}
.expert-social a:hover { background: var(--primary); color: #fff; }
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; border-radius: 6px; }

/* ---- 合作品牌 ---- */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }

/* ---- 加入指南 ---- */
.join-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.join-step {
  text-align: center;
  padding: 24px 16px;
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
}
.join-step-num {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  margin: 0 auto 14px;
}
.join-step h4 { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.join-step p { font-size: 0.82rem; color: var(--text-muted); }

/* ---- FAQ ---- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--primary); }
.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}
.faq-question:hover { color: var(--primary); }
.faq-icon {
  width: 22px;
  height: 22px;
  background: var(--dark3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--primary);
  flex-shrink: 0;
  transition: transform 0.3s;
}
.faq-item.open .faq-icon { transform: rotate(45deg); }
.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 20px 18px; }

/* ---- 用户评价 ---- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}
.review-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.review-stars { color: var(--gold); font-size: 0.85rem; margin-bottom: 10px; }
.review-text { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; }
.review-user { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: 0.85rem; font-weight: 600; color: var(--text); }
.review-date { font-size: 0.75rem; color: var(--text-dim); }

/* ---- 联系方式 ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}
.contact-info-list { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 16px;
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(255,107,0,0.12);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-label { font-size: 0.78rem; color: var(--text-dim); margin-bottom: 2px; }
.contact-value { font-size: 0.92rem; font-weight: 600; color: var(--text); }
.qr-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.qr-card {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.qr-img {
  width: 120px;
  height: 120px;
  background: #fff;
  border-radius: 8px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.qr-label { font-size: 0.85rem; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.qr-desc { font-size: 0.78rem; color: var(--text-muted); }

/* ---- 社区入口 ---- */
.community-entries {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 24px;
}
.community-entry {
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: var(--transition);
  cursor: pointer;
}
.community-entry:hover { border-color: var(--primary); background: rgba(255,107,0,0.05); }
.community-entry-icon { font-size: 1.4rem; }
.community-entry-text { }
.community-entry-name { font-size: 0.88rem; font-weight: 600; color: var(--text); }
.community-entry-desc { font-size: 0.75rem; color: var(--text-muted); }

/* ---- 页脚 ---- */
.site-footer {
  background: var(--dark2);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand { }
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-logo img { width: 40px; height: 40px; object-fit: contain; }
.footer-logo-text { font-size: 1.2rem; font-weight: 800; color: var(--text); }
.footer-logo-text span { color: var(--primary); }
.footer-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 34px;
  height: 34px;
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-social a:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.footer-col h5 { font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.footer-links { display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 0.83rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copy { font-size: 0.82rem; color: var(--text-dim); }
.footer-copy a { color: var(--text-muted); }
.footer-copy a:hover { color: var(--primary); }
.footer-update { font-size: 0.78rem; color: var(--text-dim); }
.footer-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.footer-tag {
  font-size: 0.72rem;
  color: var(--text-dim);
  background: var(--dark3);
  padding: 2px 8px;
  border-radius: 4px;
}

/* ---- 分享按钮 ---- */
.share-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.share-label { font-size: 0.85rem; color: var(--text-muted); }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--dark3);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); }

/* ---- 统计数字 ---- */
.stats-bar {
  background: var(--dark2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 30px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item { }
.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
  line-height: 1;
  margin-bottom: 4px;
}
.stat-label { font-size: 0.8rem; color: var(--text-muted); }

/* ---- 面包屑 ---- */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; color: var(--text-dim); }
.breadcrumb .current { color: var(--text); }

/* ---- 内页Hero ---- */
.page-hero {
  background: linear-gradient(135deg, var(--dark2) 0%, var(--dark) 100%);
  padding: 100px 0 50px;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 800; color: var(--text); margin-bottom: 10px; }
.page-hero h1 span { color: var(--primary); }
.page-hero p { color: var(--text-muted); font-size: 1rem; max-width: 600px; }

/* ---- 标签 ---- */
.tag {
  display: inline-block;
  background: var(--dark3);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 4px;
  transition: var(--transition);
}
.tag:hover { border-color: var(--primary); color: var(--primary); }
.tag-primary { background: rgba(255,107,0,0.1); border-color: rgba(255,107,0,0.3); color: var(--primary); }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--dark4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

/* ---- 动画 ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}
.animate-in { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-in.visible { opacity: 1; transform: translateY(0); }

/* ---- 移动端适配 ---- */
@media (max-width: 1024px) {
  .video-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .join-steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 50px 0; }
  .nav-menu { display: none; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: var(--dark2);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    gap: 4px;
  }
  .nav-hamburger { display: flex; }
  .nav-search { display: none; }
  .hero-stats { gap: 20px; }
  .video-grid-3 { grid-template-columns: 1fr 1fr; }
  .video-grid-4 { grid-template-columns: 1fr 1fr; }
  .media-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .join-steps { grid-template-columns: 1fr; }
  .community-entries { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .video-grid-3, .video-grid-4 { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
  .qr-grid { grid-template-columns: 1fr; }
}

/* ---- 搜索结果弹窗 ---- */
.search-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  align-items: flex-start;
  justify-content: center;
  padding-top: 80px;
}
.search-modal.open { display: flex; }
.search-modal-box {
  background: var(--dark2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 600px;
  padding: 20px;
  box-shadow: var(--shadow);
}
.search-modal-input {
  width: 100%;
  background: var(--dark3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  color: var(--text);
  font-size: 1rem;
  outline: none;
  margin-bottom: 16px;
}
.search-modal-input:focus { border-color: var(--primary); }
.search-hot { display: flex; flex-wrap: wrap; gap: 8px; }
.search-hot-label { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 8px; width: 100%; }

/* ---- 视频播放弹窗 ---- */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.9);
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-box {
  background: var(--dark2);
  border-radius: var(--radius);
  width: 90%;
  max-width: 900px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.video-modal-header {
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.video-modal-title { font-size: 0.95rem; font-weight: 600; color: var(--text); }
.video-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
}
.video-modal-close:hover { color: var(--primary); }
.video-modal-player {
  aspect-ratio: 16/9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ---- 加载动画 ---- */
.skeleton {
  background: linear-gradient(90deg, var(--dark3) 25%, var(--dark4) 50%, var(--dark3) 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s infinite;
  border-radius: 4px;
}
@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---- 回到顶部 ---- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 14px rgba(255,107,0,0.4);
}
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: var(--primary-dark); transform: translateY(-2px); }

/* ---- 分类筛选 ---- */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.filter-btn {
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--dark2);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ---- 通知栏 ---- */
.notice-bar {
  background: rgba(255,107,0,0.1);
  border-bottom: 1px solid rgba(255,107,0,0.2);
  padding: 8px 0;
  font-size: 0.82rem;
  color: var(--primary);
  text-align: center;
}
.notice-bar a { color: var(--primary); font-weight: 600; }

/* ---- 徽章 ---- */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 700;
}
.badge-hot { background: rgba(255,59,48,0.15); color: #FF3B30; }
.badge-new { background: rgba(63,185,80,0.15); color: var(--success); }
.badge-top { background: rgba(255,215,0,0.15); color: var(--gold); }