/*
 * 51动漫 - 汽车改装视频社区
 * 主样式文件 | 原创设计 | bdsadk.cn
 * 橙焰赛道主题
 */

/* ---- CSS变量 ---- */
:root {
  --primary: #E84010;
  --primary-dark: #B52D08;
  --primary-light: #FF6B35;
  --accent: #F5A623;
  --accent-light: #FFD166;
  --dark: #0F0F0F;
  --dark-2: #1A1A1A;
  --dark-3: #242424;
  --dark-4: #2E2E2E;
  --dark-border: #3A3A3A;
  --text-main: #F0F0F0;
  --text-muted: #999;
  --text-light: #CCC;
  --gradient-hero: linear-gradient(135deg, #0F0F0F 0%, #1A0A00 50%, #0F0F0F 100%);
  --gradient-card: linear-gradient(145deg, #1E1E1E 0%, #141414 100%);
  --gradient-orange: linear-gradient(135deg, #E84010, #F5A623, #E84010);
  --shadow-card: 0 6px 24px rgba(232,64,16,0.18);
  --shadow-glow: 0 0 24px rgba(245,166,35,0.35);
  --radius: 10px;
  --radius-lg: 18px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC','Microsoft YaHei','微软雅黑','Noto Sans SC',sans-serif;
  background: var(--dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--dark); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* =============================================
   头部导航
   ============================================= */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(15,15,15,0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(232,64,16,0.25);
  transition: var(--transition);
}
.site-header.scrolled {
  background: rgba(15,15,15,0.99);
  box-shadow: 0 2px 20px rgba(232,64,16,0.2);
}
.header-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 68px;
}
.site-logo {
  display: flex; align-items: center; gap: 10px; text-decoration: none;
}
.logo-img { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; }
.logo-text {
  font-size: 1.25rem; font-weight: 800; letter-spacing: 0.02em;
  background: var(--gradient-orange); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px; border-radius: 6px;
  font-size: 0.9rem; font-weight: 500; color: var(--text-light);
  transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
  color: var(--accent); background: rgba(245,166,35,0.1);
}
.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.menu-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text-main); border-radius: 2px; transition: var(--transition);
}

/* ---- 搜索框 ---- */
.header-search {
  position: relative; margin-left: 12px;
}
.search-wrap {
  display: flex; align-items: center;
  background: var(--dark-3); border: 1px solid var(--dark-border);
  border-radius: 22px; overflow: hidden; transition: var(--transition);
}
.search-wrap:focus-within {
  border-color: var(--primary); box-shadow: 0 0 0 2px rgba(232,64,16,0.15);
}
.search-wrap input {
  background: none; border: none; outline: none;
  color: var(--text-main); font-size: 0.88rem;
  padding: 8px 14px; width: 180px;
}
.search-wrap input::placeholder { color: var(--text-muted); }
.search-wrap button {
  background: var(--primary); border: none; cursor: pointer;
  color: #fff; padding: 8px 14px; font-size: 0.9rem;
  transition: var(--transition);
}
.search-wrap button:hover { background: var(--primary-dark); }
.search-dropdown {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0;
  background: var(--dark-3); border: 1px solid var(--dark-border);
  border-radius: var(--radius); padding: 10px;
  display: none; z-index: 100;
}
.search-dropdown.show { display: block; }
.search-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.search-tags span {
  background: var(--dark-4); color: var(--text-muted);
  padding: 4px 10px; border-radius: 12px; font-size: 0.8rem; cursor: pointer;
  transition: var(--transition);
}
.search-tags span:hover { background: var(--primary); color: #fff; }

/* =============================================
   公告栏
   ============================================= */
.notice-bar {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary), var(--accent));
  padding: 8px 0; overflow: hidden; margin-top: 68px;
}
.notice-track {
  display: flex; gap: 80px; white-space: nowrap;
  animation: marquee 30s linear infinite;
}
.notice-item {
  font-size: 0.85rem; color: #fff; font-weight: 500;
}
@keyframes marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* =============================================
   Hero区域
   ============================================= */
.hero-section {
  position: relative; min-height: 92vh;
  display: flex; align-items: center;
  background: var(--gradient-hero);
  overflow: hidden;
}
.hero-bg-img {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(15,15,15,0.85) 0%, rgba(232,64,16,0.1) 50%, rgba(15,15,15,0.9) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  width: 100%;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(232,64,16,0.15); border: 1px solid rgba(232,64,16,0.4);
  color: var(--accent); padding: 6px 14px; border-radius: 20px;
  font-size: 0.82rem; font-weight: 600; margin-bottom: 20px;
}
.hero-badge::before { content: '🏎'; font-size: 1rem; }
.hero-title {
  font-size: clamp(2.2rem, 5vw, 4rem); font-weight: 900;
  line-height: 1.15; margin-bottom: 18px;
  color: var(--text-main);
}
.hero-title .hl {
  background: var(--gradient-orange);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.1rem; color: var(--text-light);
  max-width: 560px; margin-bottom: 32px; line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 48px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: 8px; font-weight: 700;
  font-size: 0.95rem; cursor: pointer; border: none; transition: var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient-orange); color: #fff;
  box-shadow: 0 4px 20px rgba(232,64,16,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px); box-shadow: 0 8px 28px rgba(232,64,16,0.5);
  color: #fff;
}
.btn-outline {
  background: transparent; color: var(--accent);
  border: 2px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent); color: var(--dark);
  transform: translateY(-2px);
}
.hero-stats {
  display: flex; gap: 40px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 2rem; font-weight: 900;
  background: var(--gradient-orange);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label { font-size: 0.82rem; color: var(--text-muted); margin-top: 2px; }

/* =============================================
   通用区块
   ============================================= */
.section { padding: 80px 0; }
.section-inner { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block;
  background: rgba(232,64,16,0.12); color: var(--primary-light);
  border: 1px solid rgba(232,64,16,0.3);
  padding: 4px 14px; border-radius: 14px;
  font-size: 0.8rem; font-weight: 600; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800;
  color: var(--text-main); margin-bottom: 12px;
}
.section-title span {
  background: var(--gradient-orange);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc { font-size: 1rem; color: var(--text-muted); max-width: 560px; margin: 0 auto; }
.divider {
  width: 60px; height: 3px;
  background: var(--gradient-orange);
  border-radius: 2px; margin: 16px auto 0;
}

/* =============================================
   视频卡片
   ============================================= */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: var(--transition); cursor: pointer;
}
.video-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
  border-color: rgba(232,64,16,0.4);
}
.video-thumb {
  position: relative; aspect-ratio: 16/9; overflow: hidden;
}
.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); transition: var(--transition);
  opacity: 0;
}
.video-card:hover .video-play-btn { opacity: 1; background: rgba(0,0,0,0.4); }
.play-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(232,64,16,0.9);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; color: #fff;
  transform: scale(0.8); transition: var(--transition);
  box-shadow: 0 0 20px rgba(232,64,16,0.6);
}
.video-card:hover .play-icon { transform: scale(1); }
.video-duration {
  position: absolute; bottom: 8px; right: 10px;
  background: rgba(0,0,0,0.75); color: #fff;
  padding: 2px 7px; border-radius: 4px; font-size: 0.78rem;
}
.video-tag {
  position: absolute; top: 8px; left: 10px;
  background: var(--primary); color: #fff;
  padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; font-weight: 600;
}
.video-info { padding: 14px 16px; }
.video-title {
  font-size: 0.95rem; font-weight: 700; color: var(--text-main);
  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; justify-content: space-between;
  font-size: 0.8rem; color: var(--text-muted);
}
.video-author {
  display: flex; align-items: center; gap: 6px;
}
.author-avatar {
  width: 22px; height: 22px; border-radius: 50%;
  background: var(--primary); display: flex; align-items: center;
  justify-content: center; font-size: 0.65rem; color: #fff; font-weight: 700;
}
.video-stats { display: flex; gap: 10px; }
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* =============================================
   精选视频大卡片
   ============================================= */
.featured-video-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 24px; margin-bottom: 24px;
}
.featured-video-card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg); overflow: hidden;
  transition: var(--transition); cursor: pointer;
}
.featured-video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(232,64,16,0.25);
  border-color: rgba(232,64,16,0.5);
}
.featured-thumb {
  position: relative; aspect-ratio: 16/9; overflow: hidden;
}
.featured-thumb img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.4s ease;
}
.featured-video-card:hover .featured-thumb img { transform: scale(1.05); }
.featured-video-card:hover .video-play-btn { opacity: 1; background: rgba(0,0,0,0.4); }
.featured-info { padding: 18px 20px; }
.featured-info .video-title { font-size: 1.05rem; margin-bottom: 10px; }

/* =============================================
   媒体标签页
   ============================================= */
.media-tabs {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-bottom: 28px; border-bottom: 1px solid var(--dark-border);
  padding-bottom: 0;
}
.media-tab {
  padding: 10px 20px; border-radius: 8px 8px 0 0;
  background: transparent; border: none; cursor: pointer;
  font-size: 0.9rem; font-weight: 600; color: var(--text-muted);
  transition: var(--transition); position: relative;
}
.media-tab.active {
  color: var(--accent); background: rgba(245,166,35,0.08);
}
.media-tab.active::after {
  content: ''; position: absolute; bottom: -1px; left: 0; right: 0;
  height: 2px; background: var(--gradient-orange);
}
.media-tab:hover { color: var(--text-main); }
.media-panel { display: none; }
.media-panel.active { display: block; }

/* =============================================
   AI赋能区块
   ============================================= */
.ai-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.ai-card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg); padding: 28px 24px;
  transition: var(--transition); text-align: center;
}
.ai-card:hover {
  border-color: rgba(232,64,16,0.5);
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}
.ai-icon {
  width: 64px; height: 64px; border-radius: 16px;
  background: rgba(232,64,16,0.12);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem; margin: 0 auto 16px;
}
.ai-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.ai-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }

/* =============================================
   专家展示
   ============================================= */
.expert-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg); padding: 28px;
  display: flex; gap: 20px; transition: var(--transition);
}
.expert-card:hover {
  border-color: rgba(232,64,16,0.4);
  box-shadow: var(--shadow-card);
}
.expert-avatar {
  width: 90px; height: 90px; border-radius: 50%;
  object-fit: cover; flex-shrink: 0;
  border: 3px solid rgba(232,64,16,0.4);
}
.expert-info { flex: 1; }
.expert-name { font-size: 1.1rem; font-weight: 800; color: var(--text-main); margin-bottom: 4px; }
.expert-title { font-size: 0.85rem; color: var(--primary-light); margin-bottom: 8px; }
.expert-desc { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; }
.expert-badge {
  display: inline-block; background: rgba(232,64,16,0.12);
  color: var(--accent); border: 1px solid rgba(245,166,35,0.3);
  padding: 2px 8px; border-radius: 10px; font-size: 0.75rem; margin-right: 4px;
}
.expert-awards { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 12px; }
.award-tag {
  background: rgba(245,166,35,0.1); color: var(--accent-light);
  border: 1px solid rgba(245,166,35,0.2);
  padding: 3px 9px; border-radius: 10px; font-size: 0.75rem;
}
.expert-actions { display: flex; gap: 8px; }
.btn-sm {
  padding: 6px 14px; font-size: 0.82rem; border-radius: 6px;
  font-weight: 600; cursor: pointer; border: none; transition: var(--transition);
  text-decoration: none;
}
.btn-sm.btn-primary { background: var(--primary); color: #fff; }
.btn-sm.btn-outline { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-sm:hover { opacity: 0.85; transform: translateY(-1px); }

/* =============================================
   合作品牌
   ============================================= */
.partners-section { background: var(--dark-2); }
.partners-scroll { overflow: hidden; }
.partners-track {
  display: flex; gap: 40px; align-items: center;
  animation: partners-scroll 20s linear infinite;
  white-space: nowrap;
}
.partner-item {
  display: flex; align-items: center; justify-content: center;
  width: 140px; height: 60px; flex-shrink: 0;
  background: var(--dark-3); border: 1px solid var(--dark-border);
  border-radius: var(--radius); padding: 10px 16px;
  font-size: 0.88rem; font-weight: 700; color: var(--text-muted);
  transition: var(--transition);
}
.partner-item:hover { color: var(--accent); border-color: var(--accent); }
@keyframes partners-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* =============================================
   社区入口
   ============================================= */
.community-section { background: var(--dark-2); }
.community-channels {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
}
.channel-card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg); padding: 24px 20px;
  text-align: center; transition: var(--transition); cursor: pointer;
}
.channel-card:hover {
  border-color: rgba(232,64,16,0.5);
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}
.channel-icon { font-size: 2.2rem; margin-bottom: 10px; }
.channel-card h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 6px; color: var(--text-main); }
.channel-count { font-size: 0.82rem; color: var(--text-muted); }

/* =============================================
   用户评价
   ============================================= */
.reviews-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.review-card {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg); padding: 22px;
  transition: var(--transition);
}
.review-card:hover {
  border-color: rgba(232,64,16,0.3);
  box-shadow: 0 4px 20px rgba(232,64,16,0.1);
}
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.reviewer-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--primary); display: flex; align-items: center;
  justify-content: center; font-size: 1rem; color: #fff; font-weight: 700;
  flex-shrink: 0;
}
.reviewer-info .name { font-size: 0.92rem; font-weight: 700; color: var(--text-main); }
.reviewer-info .date { font-size: 0.78rem; color: var(--text-muted); }
.review-stars { color: var(--accent); font-size: 0.9rem; margin-bottom: 10px; }
.review-text { font-size: 0.88rem; color: var(--text-light); line-height: 1.7; }
.review-game-tag {
  display: inline-block; margin-top: 10px;
  background: rgba(232,64,16,0.1); color: var(--primary-light);
  padding: 2px 8px; border-radius: 8px; font-size: 0.75rem;
}

/* =============================================
   FAQ
   ============================================= */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius); margin-bottom: 10px;
  overflow: hidden; transition: var(--transition);
}
.faq-item.open { border-color: rgba(232,64,16,0.4); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; cursor: pointer; font-weight: 600;
  font-size: 0.95rem; color: var(--text-main);
  background: none; border: none; width: 100%; text-align: left;
}
.faq-arrow {
  font-size: 0.75rem; color: var(--text-muted);
  transition: transform 0.3s ease;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--accent); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-answer-inner {
  padding: 0 22px 18px; font-size: 0.9rem;
  color: var(--text-muted); line-height: 1.8;
}

/* =============================================
   联系我们
   ============================================= */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
}
.contact-info-block {
  background: var(--gradient-card);
  border: 1px solid var(--dark-border);
  border-radius: var(--radius-lg); padding: 28px;
}
.contact-info-block h3 {
  font-size: 1.1rem; font-weight: 800; margin-bottom: 20px;
  color: var(--text-main);
}
.contact-item {
  display: flex; align-items: flex-start; gap: 12px;
  margin-bottom: 16px;
}
.contact-icon {
  width: 38px; height: 38px; border-radius: 10px;
  background: rgba(232,64,16,0.12);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0;
}
.contact-detail .label { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-detail .value { font-size: 0.9rem; color: var(--text-main); font-weight: 600; }
.qr-codes { display: flex; gap: 20px; margin-top: 20px; }
.qr-item { text-align: center; }
.qr-item img { width: 100px; height: 100px; border-radius: 8px; margin-bottom: 6px; }
.qr-item span { font-size: 0.78rem; color: var(--text-muted); }

/* =============================================
   社区入口列表
   ============================================= */
.entry-list { display: flex; flex-direction: column; gap: 10px; }
.entry-item {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--dark-3); border: 1px solid var(--dark-border);
  border-radius: var(--radius); padding: 14px 18px;
  transition: var(--transition); cursor: pointer;
}
.entry-item:hover { border-color: rgba(232,64,16,0.4); background: var(--dark-4); }
.entry-left { display: flex; align-items: center; gap: 12px; }
.entry-icon { font-size: 1.4rem; }
.entry-name { font-size: 0.92rem; font-weight: 700; color: var(--text-main); }
.entry-sub { font-size: 0.78rem; color: var(--text-muted); }
.entry-arrow { color: var(--text-muted); font-size: 0.8rem; }

/* =============================================
   分享栏
   ============================================= */
.share-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 0; border-top: 1px solid var(--dark-border);
  margin-top: 20px;
}
.share-label { font-size: 0.85rem; color: var(--text-muted); }
.share-btn {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 6px 14px; border-radius: 6px; font-size: 0.82rem;
  font-weight: 600; cursor: pointer; border: none;
  transition: var(--transition); text-decoration: none;
}
.share-btn.wechat { background: #07C160; color: #fff; }
.share-btn.weibo { background: #E6162D; color: #fff; }
.share-btn.douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-btn.bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-1px); color: #fff; }

/* =============================================
   Toast通知
   ============================================= */
.tx-toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--dark-3); color: var(--text-main);
  padding: 12px 24px; border-radius: 8px; font-size: 0.9rem;
  border: 1px solid var(--dark-border);
  opacity: 0; transition: all 0.3s ease; z-index: 9999;
  pointer-events: none;
}
.tx-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--dark-2);
  border-top: 1px solid var(--dark-border);
  padding: 56px 0 0;
}
.footer-inner { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; margin-bottom: 40px;
}
.footer-brand .logo-text { font-size: 1.4rem; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.8; max-width: 280px; }
.footer-col h4 { font-size: 0.95rem; font-weight: 700; color: var(--text-main); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.88rem; color: var(--text-muted); }
.footer-col ul li a:hover { color: var(--accent); }
.footer-social { display: flex; gap: 10px; margin-top: 16px; }
.footer-social a {
  width: 36px; height: 36px; border-radius: 8px;
  background: var(--dark-3); border: 1px solid var(--dark-border);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; color: var(--text-muted); transition: var(--transition);
}
.footer-social a:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--dark-border);
  padding: 20px 0;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 10px;
}
.footer-copyright { font-size: 0.82rem; color: var(--text-muted); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 0.82rem; color: var(--text-muted); }
.footer-links a:hover { color: var(--accent); }

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
  background: var(--dark-2); border-bottom: 1px solid var(--dark-border);
  padding: 12px 0; margin-top: 68px;
}
.breadcrumb-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; gap: 6px;
  font-size: 0.85rem; color: var(--text-muted);
}
.breadcrumb-inner a { color: var(--text-muted); }
.breadcrumb-inner a:hover { color: var(--accent); }
.breadcrumb-inner .sep { color: var(--dark-border); }
.breadcrumb-inner .current { color: var(--text-main); }

/* =============================================
   内页通用
   ============================================= */
.page-hero {
  background: var(--dark-2);
  border-bottom: 1px solid var(--dark-border);
  padding: 48px 0;
}
.page-hero-inner { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.page-hero h1 { font-size: 2rem; font-weight: 800; margin-bottom: 10px; }
.page-hero p { color: var(--text-muted); font-size: 1rem; }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .featured-video-grid { grid-template-columns: 1fr; }
  .expert-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; position: fixed; top: 68px; left: 0; right: 0; bottom: 0; background: rgba(15,15,15,0.98); flex-direction: column; align-items: center; justify-content: center; gap: 16px; z-index: 999; }
  .main-nav.open { display: flex; }
  .main-nav a { font-size: 1.1rem; padding: 12px 24px; }
  .menu-toggle { display: flex; }
  .header-search { display: none; }
  .hero-section { min-height: 70vh; }
  .hero-stats { gap: 24px; }
  .community-channels { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}
@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .community-channels { grid-template-columns: 1fr 1fr; }
  .media-tabs { gap: 4px; }
  .media-tab { padding: 8px 12px; font-size: 0.82rem; }
}