/* =============================================
   玩物社区 - 汽车改装视频社区
   原创CSS样式 | 3mz0g19.cn
   主色调：活力橙 #FF6B1A + 深海蓝 #0D1B2A
   ============================================= */

/* === 全局重置 === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  background: #0D1B2A;
  color: #E8EDF2;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #FF6B1A; text-decoration: none; transition: color 0.3s; }
a:hover { color: #FFB347; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* === CSS变量 === */
:root {
  --orange: #FF6B1A;
  --orange-light: #FFB347;
  --orange-dark: #CC4A00;
  --navy: #0D1B2A;
  --navy-mid: #162436;
  --navy-light: #1E3248;
  --navy-card: #1A2D42;
  --white: #FFFFFF;
  --text-main: #E8EDF2;
  --text-muted: #8FA3B8;
  --text-dim: #5A7A96;
  --border: rgba(255,107,26,0.2);
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --transition: 0.3s ease;
}

/* === 滚动条 === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--navy); }
::-webkit-scrollbar-thumb { background: var(--orange); border-radius: 3px; }

/* === 容器 === */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.section-gap { padding: 80px 0; }
.section-gap-sm { padding: 50px 0; }

/* === 干扰标签隐藏（不破坏布局）=== */
.kktu-noise { display: none !important; }

/* =============================================
   顶部导航
   ============================================= */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,27,42,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.site-header.scrolled {
  background: rgba(13,27,42,0.99);
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px; padding: 0 20px; max-width: 1200px; margin: 0 auto;
}
.logo-wrap { display: flex; align-items: center; gap: 10px; }
.logo-wrap img.logo-icon { width: 38px; height: 38px; border-radius: 50%; object-fit: cover; }
.logo-wrap .logo-text { font-size: 1.3rem; font-weight: 800; color: var(--white); letter-spacing: 1px; }
.logo-wrap .logo-text span { color: var(--orange); }

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--text-main); font-size: 0.92rem; padding: 8px 14px;
  border-radius: var(--radius-sm); transition: var(--transition);
  white-space: nowrap; font-weight: 500;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--orange); background: rgba(255,107,26,0.12);
}
.nav-cta {
  background: var(--orange) !important; color: var(--white) !important;
  padding: 8px 18px !important; border-radius: 20px !important;
}
.nav-cta:hover { background: var(--orange-dark) !important; }

/* 汉堡菜单 */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { width: 24px; height: 2px; background: var(--white); border-radius: 2px; transition: var(--transition); }

/* =============================================
   搜索栏
   ============================================= */
.search-bar-wrap {
  background: var(--navy-mid);
  border-bottom: 1px solid rgba(255,107,26,0.1);
  padding: 10px 0;
}
.search-bar-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; gap: 12px;
}
.search-bar-inner .search-label {
  font-size: 0.85rem; color: var(--text-muted); white-space: nowrap;
}
.search-form {
  display: flex; flex: 1; max-width: 600px;
  background: var(--navy-light); border: 1px solid var(--border);
  border-radius: 24px; overflow: hidden;
}
.search-form input {
  flex: 1; background: none; border: none; outline: none;
  padding: 8px 16px; color: var(--text-main); font-size: 0.9rem;
}
.search-form input::placeholder { color: var(--text-dim); }
.search-form button {
  background: var(--orange); border: none; padding: 8px 20px;
  color: var(--white); cursor: pointer; font-size: 0.9rem;
  transition: var(--transition);
}
.search-form button:hover { background: var(--orange-dark); }
.search-hot-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.search-hot-tags span { font-size: 0.78rem; color: var(--text-dim); }
.search-hot-tags a {
  font-size: 0.78rem; color: var(--text-muted); padding: 2px 8px;
  border: 1px solid var(--border); border-radius: 10px;
  transition: var(--transition);
}
.search-hot-tags a:hover { color: var(--orange); border-color: var(--orange); }

/* =============================================
   Hero 首屏
   ============================================= */
.hero-section {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  background: var(--navy);
  overflow: hidden;
  padding-top: 120px;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover; background-position: center;
  opacity: 0.25;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(13,27,42,0.9) 0%, rgba(13,27,42,0.6) 50%, rgba(255,107,26,0.1) 100%);
}
.hero-content { position: relative; z-index: 2; max-width: 700px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,107,26,0.15); border: 1px solid rgba(255,107,26,0.4);
  color: var(--orange-light); padding: 6px 16px; border-radius: 20px;
  font-size: 0.82rem; font-weight: 600; margin-bottom: 24px;
  letter-spacing: 0.5px;
}
.hero-badge::before { content: ''; width: 6px; height: 6px; background: var(--orange); border-radius: 50%; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.3)} }
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900; line-height: 1.15;
  color: var(--white); margin-bottom: 20px;
}
.hero-title .brand { color: var(--orange); }
.hero-title .highlight {
  background: linear-gradient(90deg, var(--orange), var(--orange-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 36px; max-width: 560px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--orange); color: var(--white);
  padding: 14px 32px; border-radius: 30px; font-weight: 700;
  font-size: 1rem; transition: var(--transition);
  box-shadow: 0 4px 20px rgba(255,107,26,0.4);
}
.btn-primary:hover { background: var(--orange-dark); color: var(--white); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,107,26,0.5); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: var(--white);
  padding: 14px 32px; border-radius: 30px; font-weight: 600;
  font-size: 1rem; border: 2px solid rgba(255,255,255,0.3);
  transition: var(--transition);
}
.btn-secondary:hover { border-color: var(--orange); color: var(--orange); }
.hero-stats {
  display: flex; gap: 40px; margin-top: 50px;
  padding-top: 40px; border-top: 1px solid var(--border);
}
.stat-item { text-align: center; }
.stat-num { font-size: 2rem; font-weight: 900; color: var(--orange); display: block; }
.stat-label { font-size: 0.82rem; color: var(--text-muted); }

/* =============================================
   通用标题样式
   ============================================= */
.section-header { text-align: center; margin-bottom: 50px; }
.section-tag {
  display: inline-block; background: rgba(255,107,26,0.15);
  color: var(--orange); padding: 4px 14px; border-radius: 12px;
  font-size: 0.8rem; font-weight: 700; letter-spacing: 1px;
  text-transform: uppercase; margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800; color: var(--white); margin-bottom: 12px;
}
.section-title .brand { color: var(--orange); }
.section-desc { color: var(--text-muted); max-width: 560px; margin: 0 auto; font-size: 0.95rem; }

/* =============================================
   视频卡片
   ============================================= */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.video-card {
  background: var(--navy-card); border-radius: var(--radius);
  overflow: hidden; transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.06);
  cursor: pointer;
}
.video-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--border); }
.video-thumb {
  position: relative; aspect-ratio: 16/9; overflow: hidden;
  background: var(--navy-light);
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s; }
.video-card:hover .video-thumb img { transform: scale(1.06); }
.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 .play-btn { opacity: 1; }
.play-icon {
  width: 56px; height: 56px; background: var(--orange);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(255,107,26,0.6);
  transform: scale(0.8); transition: var(--transition);
}
.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 white;
  margin-left: 4px;
}
.video-duration {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75); color: var(--white);
  font-size: 0.75rem; padding: 2px 7px; border-radius: 4px;
}
.video-tag {
  position: absolute; top: 8px; left: 8px;
  background: var(--orange); color: var(--white);
  font-size: 0.7rem; padding: 2px 8px; border-radius: 4px; font-weight: 600;
}
.video-info { padding: 16px; }
.video-title { font-size: 0.95rem; font-weight: 600; color: var(--white); margin-bottom: 8px; line-height: 1.4; }
.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-views::before { content: '▶'; font-size: 0.7rem; }
.video-likes::before { content: '♥'; font-size: 0.7rem; color: #ff4d6d; }
.video-comments::before { content: '💬'; font-size: 0.7rem; }

/* =============================================
   汽车传媒专区
   ============================================= */
.media-section { background: var(--navy-mid); }
.media-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.media-card {
  background: var(--navy-card); border-radius: var(--radius);
  padding: 28px 24px; border: 1px solid rgba(255,255,255,0.06);
  transition: var(--transition); position: relative; overflow: hidden;
}
.media-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--orange-light));
  transform: scaleX(0); transition: var(--transition);
}
.media-card:hover::before { transform: scaleX(1); }
.media-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.media-icon { font-size: 2.2rem; margin-bottom: 16px; }
.media-card h3 { font-size: 1.05rem; color: var(--white); margin-bottom: 10px; font-weight: 700; }
.media-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; }
.media-card .media-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.media-card .media-tags span {
  font-size: 0.72rem; background: rgba(255,107,26,0.12);
  color: var(--orange-light); padding: 2px 8px; border-radius: 8px;
}

/* =============================================
   娱乐专区
   ============================================= */
.ent-section { background: var(--navy); }
.ent-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.ent-card {
  background: var(--navy-card); border-radius: var(--radius-lg);
  overflow: hidden; position: relative; min-height: 220px;
  display: flex; flex-direction: column; justify-content: flex-end;
  border: 1px solid rgba(255,255,255,0.06); transition: var(--transition);
}
.ent-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.ent-card-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0.4; transition: transform 0.4s;
}
.ent-card:hover .ent-card-bg { transform: scale(1.04); }
.ent-card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(13,27,42,0.95) 0%, transparent 60%);
}
.ent-card-content { position: relative; z-index: 2; padding: 24px; }
.ent-card-tag {
  display: inline-block; background: var(--orange); color: var(--white);
  font-size: 0.72rem; padding: 2px 10px; border-radius: 10px;
  font-weight: 700; margin-bottom: 8px;
}
.ent-card h3 { font-size: 1.1rem; color: var(--white); font-weight: 700; margin-bottom: 6px; }
.ent-card p { font-size: 0.85rem; color: var(--text-muted); }

/* =============================================
   AI赋能专区
   ============================================= */
.ai-section { background: var(--navy-mid); }
.ai-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.ai-card {
  background: var(--navy-card); border-radius: var(--radius);
  padding: 32px 24px; text-align: center;
  border: 1px solid rgba(255,255,255,0.06); transition: var(--transition);
  position: relative; overflow: hidden;
}
.ai-card::after {
  content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 60%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--orange), transparent);
  opacity: 0; transition: var(--transition);
}
.ai-card:hover::after { opacity: 1; }
.ai-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.ai-icon-wrap {
  width: 70px; height: 70px; margin: 0 auto 20px;
  background: linear-gradient(135deg, rgba(255,107,26,0.2), rgba(255,107,26,0.05));
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 2rem; border: 1px solid rgba(255,107,26,0.3);
}
.ai-card h3 { font-size: 1rem; color: var(--white); margin-bottom: 10px; font-weight: 700; }
.ai-card p { font-size: 0.87rem; color: var(--text-muted); line-height: 1.6; }

/* =============================================
   社区功能专区
   ============================================= */
.community-section { background: var(--navy); }
.community-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.cf-card {
  background: var(--navy-card); border-radius: var(--radius);
  padding: 24px; display: flex; gap: 18px; align-items: flex-start;
  border: 1px solid rgba(255,255,255,0.06); transition: var(--transition);
}
.cf-card:hover { border-color: var(--border); transform: translateX(4px); }
.cf-icon {
  width: 52px; height: 52px; flex-shrink: 0;
  background: rgba(255,107,26,0.15); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; font-size: 1.5rem;
}
.cf-content h4 { font-size: 0.98rem; color: var(--white); font-weight: 700; margin-bottom: 6px; }
.cf-content p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.5; }
.cf-content .cf-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 10px; }
.cf-content .cf-tags span {
  font-size: 0.7rem; background: rgba(255,255,255,0.06);
  color: var(--text-muted); padding: 2px 7px; border-radius: 6px;
}

/* =============================================
   专家团队
   ============================================= */
.experts-section { background: var(--navy-mid); }
.experts-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px; }
.expert-card {
  background: var(--navy-card); border-radius: var(--radius);
  padding: 28px 20px; text-align: center;
  border: 1px solid rgba(255,255,255,0.06); transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--border); }
.expert-avatar {
  width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 16px;
  object-fit: cover; border: 3px solid var(--orange);
}
.expert-name { font-size: 1.05rem; font-weight: 700; color: var(--white); margin-bottom: 4px; }
.expert-title { font-size: 0.82rem; color: var(--orange); margin-bottom: 10px; }
.expert-desc { font-size: 0.83rem; color: var(--text-muted); line-height: 1.5; margin-bottom: 14px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 5px; justify-content: center; margin-bottom: 14px; }
.expert-awards span {
  font-size: 0.7rem; background: rgba(255,107,26,0.12);
  color: var(--orange-light); padding: 2px 8px; border-radius: 8px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }
.expert-btns a {
  font-size: 0.78rem; padding: 6px 14px; border-radius: 16px;
  border: 1px solid var(--border); color: var(--text-muted); transition: var(--transition);
}
.expert-btns a:hover { background: var(--orange); color: var(--white); border-color: var(--orange); }

/* =============================================
   合作品牌
   ============================================= */
.partners-section { background: var(--navy); }
.partners-grid {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px;
  margin-bottom: 50px;
}
.partner-logo {
  background: var(--navy-card); border-radius: var(--radius-sm);
  padding: 18px 12px; text-align: center;
  border: 1px solid rgba(255,255,255,0.06); transition: var(--transition);
}
.partner-logo:hover { border-color: var(--border); transform: scale(1.04); }
.partner-logo span { font-size: 0.82rem; color: var(--text-muted); font-weight: 600; }
.howto-wrap { background: var(--navy-card); border-radius: var(--radius-lg); padding: 40px; margin-bottom: 40px; }
.howto-title { font-size: 1.3rem; font-weight: 700; color: var(--white); margin-bottom: 24px; }
.howto-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.howto-step { text-align: center; }
.step-num {
  width: 44px; height: 44px; background: var(--orange); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 800; color: var(--white);
  margin: 0 auto 12px;
}
.howto-step h5 { font-size: 0.9rem; color: var(--white); margin-bottom: 6px; }
.howto-step p { font-size: 0.82rem; color: var(--text-muted); }

/* =============================================
   FAQ
   ============================================= */
.faq-section { background: var(--navy-mid); }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--navy-card); border-radius: var(--radius);
  margin-bottom: 12px; border: 1px solid rgba(255,255,255,0.06);
  overflow: hidden;
}
.faq-q {
  padding: 18px 24px; font-size: 0.95rem; font-weight: 600;
  color: var(--white); cursor: pointer; display: flex;
  justify-content: space-between; align-items: center;
  transition: var(--transition);
}
.faq-q:hover { color: var(--orange); }
.faq-q .faq-arrow {
  width: 24px; height: 24px; background: rgba(255,107,26,0.15);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; color: var(--orange); transition: var(--transition); flex-shrink: 0;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); background: var(--orange); color: var(--white); }
.faq-a {
  padding: 0 24px; max-height: 0; overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s;
  font-size: 0.88rem; color: var(--text-muted); line-height: 1.7;
}
.faq-item.open .faq-a { max-height: 300px; padding: 0 24px 18px; }

/* =============================================
   用户评论
   ============================================= */
.reviews-section { background: var(--navy); }
.reviews-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.review-card {
  background: var(--navy-card); border-radius: var(--radius);
  padding: 24px; border: 1px solid rgba(255,255,255,0.06);
  transition: var(--transition);
}
.review-card:hover { border-color: var(--border); transform: translateY(-3px); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.review-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 700; color: var(--white); flex-shrink: 0;
}
.av-orange { background: linear-gradient(135deg, #FF6B1A, #FFB347); }
.av-blue { background: linear-gradient(135deg, #1E88E5, #42A5F5); }
.av-green { background: linear-gradient(135deg, #43A047, #66BB6A); }
.av-purple { background: linear-gradient(135deg, #8E24AA, #BA68C8); }
.av-red { background: linear-gradient(135deg, #E53935, #EF9A9A); }
.av-teal { background: linear-gradient(135deg, #00897B, #4DB6AC); }
.review-user-name { font-size: 0.92rem; font-weight: 600; color: var(--white); }
.review-user-tag { font-size: 0.75rem; color: var(--text-muted); }
.review-stars { color: #FFB347; font-size: 0.85rem; margin-bottom: 10px; }
.review-text { font-size: 0.87rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 12px; }
.review-date { font-size: 0.75rem; color: var(--text-dim); }

/* =============================================
   联系我们
   ============================================= */
.contact-section { background: var(--navy-mid); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.contact-info h3 { font-size: 1.2rem; color: var(--white); font-weight: 700; margin-bottom: 20px; }
.contact-item { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 16px; }
.contact-icon {
  width: 40px; height: 40px; background: rgba(255,107,26,0.15);
  border-radius: var(--radius-sm); display: flex; align-items: center;
  justify-content: center; font-size: 1.1rem; flex-shrink: 0;
}
.contact-item-text { font-size: 0.88rem; }
.contact-item-text strong { color: var(--white); display: block; margin-bottom: 2px; }
.contact-item-text span { color: var(--text-muted); }
.qr-row { display: flex; gap: 24px; margin-top: 24px; }
.qr-box { text-align: center; }
.qr-box img { width: 100px; height: 100px; border-radius: var(--radius-sm); margin-bottom: 8px; }
.qr-box p { font-size: 0.78rem; color: var(--text-muted); }
.social-links { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }
.social-link {
  display: flex; align-items: center; gap: 6px;
  background: var(--navy-card); border: 1px solid var(--border);
  color: var(--text-muted); padding: 8px 16px; border-radius: 20px;
  font-size: 0.82rem; transition: var(--transition);
}
.social-link:hover { background: var(--orange); color: var(--white); border-color: var(--orange); }

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--navy);
  border-top: 1px solid var(--border);
  padding: 50px 0 20px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo-wrap { margin-bottom: 16px; }
.footer-brand p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; max-width: 280px; }
.footer-col h4 { font-size: 0.92rem; font-weight: 700; color: var(--white); margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 0.85rem; color: var(--text-muted); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--orange); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px; display: flex;
  justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { font-size: 0.82rem; color: var(--text-dim); }
.footer-bottom .update-time { font-size: 0.8rem; color: var(--text-dim); }

/* =============================================
   面包屑
   ============================================= */
.breadcrumb-wrap {
  background: var(--navy-mid); padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--orange); }
.breadcrumb .sep { color: var(--text-dim); }
.breadcrumb .current { color: var(--orange); }

/* =============================================
   内页通用
   ============================================= */
.page-hero {
  padding: 120px 0 60px;
  background: var(--navy-mid);
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 800; color: var(--white); margin-bottom: 12px; }
.page-hero p { color: var(--text-muted); font-size: 1rem; }

/* 视频播放页 */
.video-player-wrap {
  background: #000; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 16/9; position: relative;
}
.video-player-wrap video { width: 100%; height: 100%; }
.video-detail-grid { display: grid; grid-template-columns: 1fr 340px; gap: 28px; margin-top: 28px; }
.video-detail-main h1 { font-size: 1.3rem; color: var(--white); font-weight: 700; margin-bottom: 12px; }
.video-detail-meta { display: flex; gap: 16px; flex-wrap: wrap; font-size: 0.83rem; color: var(--text-muted); margin-bottom: 16px; }
.video-detail-desc { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; }
.sidebar-related h3 { font-size: 1rem; font-weight: 700; color: var(--white); margin-bottom: 16px; }
.related-item { display: flex; gap: 12px; margin-bottom: 14px; cursor: pointer; }
.related-thumb { width: 100px; flex-shrink: 0; aspect-ratio: 16/9; border-radius: var(--radius-sm); overflow: hidden; background: var(--navy-light); }
.related-thumb img { width: 100%; height: 100%; object-fit: cover; }
.related-info .related-title { font-size: 0.83rem; color: var(--white); line-height: 1.4; margin-bottom: 4px; }
.related-info .related-meta { font-size: 0.75rem; color: var(--text-muted); }

/* 标签云 */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tag-cloud a {
  font-size: 0.78rem; background: rgba(255,255,255,0.05);
  color: var(--text-muted); padding: 4px 12px; border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08); transition: var(--transition);
}
.tag-cloud a:hover { background: rgba(255,107,26,0.15); color: var(--orange); border-color: var(--border); }

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .media-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
  .partners-grid { grid-template-columns: repeat(4, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .howto-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav { display: none; position: fixed; top: 68px; left: 0; right: 0; background: var(--navy); padding: 20px; flex-direction: column; gap: 4px; border-bottom: 1px solid var(--border); }
  .main-nav.open { display: flex; }
  .hamburger { display: flex; }
  .hero-stats { gap: 20px; }
  .stat-num { font-size: 1.5rem; }
  .media-grid { grid-template-columns: 1fr; }
  .ent-grid { grid-template-columns: 1fr; }
  .ai-grid { grid-template-columns: 1fr; }
  .community-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .partners-grid { grid-template-columns: repeat(3, 1fr); }
  .video-detail-grid { grid-template-columns: 1fr; }
  .howto-steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .hero-stats { flex-wrap: wrap; gap: 16px; }
  .partners-grid { grid-template-columns: repeat(2, 1fr); }
  .search-hot-tags { display: none; }
  .howto-steps { grid-template-columns: 1fr; }
  .qr-row { flex-direction: column; align-items: center; }
}

/* =============================================
   加载动画
   ============================================= */
.lazy-img { opacity: 0; transition: opacity 0.4s; }
.lazy-img.loaded { opacity: 1; }

/* 滚动显示动画 */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.5s, transform 0.5s; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* =============================================
   MCP前端占位
   ============================================= */
.mcp-widget {
  background: var(--navy-card); border-radius: var(--radius);
  padding: 20px; border: 1px dashed var(--border);
  text-align: center; color: var(--text-dim); font-size: 0.82rem;
}

/* === 社区帖子卡片 === */
.community-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 20px; }
.community-post-card {
  background: var(--navy-card); border-radius: var(--radius); padding: 20px;
  border: 1px solid rgba(255,107,26,0.12); transition: var(--transition);
}
.community-post-card:hover { border-color: var(--border); transform: translateY(-3px); }
.post-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.post-avatar { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.post-username { font-size: 0.92rem; font-weight: 700; color: var(--white); }
.post-user-tag { font-size: 0.78rem; color: var(--text-muted); }
.post-tag { margin-left: auto; background: rgba(255,107,26,0.15); color: var(--orange); font-size: 0.75rem; padding: 3px 10px; border-radius: 20px; }
.post-content { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; }
.post-footer { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-dim); }
.post-date { margin-right: auto; }

/* === 头像颜色 === */
.av-orange { background: linear-gradient(135deg, #FF6B1A, #FFB347); color: #fff; width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; flex-shrink: 0; }
.av-blue { background: linear-gradient(135deg, #1E88E5, #42A5F5); color: #fff; width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; flex-shrink: 0; }
.av-green { background: linear-gradient(135deg, #43A047, #66BB6A); color: #fff; width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; flex-shrink: 0; }
.av-purple { background: linear-gradient(135deg, #7B1FA2, #AB47BC); color: #fff; width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; flex-shrink: 0; }
.av-red { background: linear-gradient(135deg, #E53935, #EF5350); color: #fff; width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; flex-shrink: 0; }
.av-teal { background: linear-gradient(135deg, #00897B, #26A69A); color: #fff; width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1rem; flex-shrink: 0; }

/* === 视频播放页侧边栏 === */
.related-thumb { width: 90px; height: 60px; border-radius: 6px; overflow: hidden; flex-shrink: 0; }
.related-thumb img { width: 100%; height: 100%; object-fit: cover; }
.related-info { flex: 1; }
.related-title { font-size: 0.82rem; color: var(--text-main); line-height: 1.4; margin-bottom: 4px; }
.related-meta { font-size: 0.75rem; color: var(--text-muted); }
.related-item:hover .related-title { color: var(--orange); }

/* === 社交链接 === */
.social-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.social-link {
  padding: 6px 14px; border-radius: 20px; font-size: 0.82rem;
  background: rgba(255,107,26,0.12); color: var(--orange);
  border: 1px solid rgba(255,107,26,0.25); transition: var(--transition);
}
.social-link:hover { background: var(--orange); color: #fff; }

/* === 二维码 === */
.qr-row { display: flex; gap: 20px; }
.qr-box { text-align: center; }
.qr-box img { width: 100px; height: 100px; border-radius: 8px; margin-bottom: 8px; }
.qr-box p { font-size: 0.8rem; color: var(--text-muted); }

/* === MCP Widget === */
.mcp-widget { background: rgba(255,107,26,0.08); border: 1px dashed rgba(255,107,26,0.3); border-radius: 8px; padding: 12px 16px; font-size: 0.82rem; color: var(--text-muted); text-align: center; }

/* === 响应式补充 === */
@media (max-width: 768px) {
  .community-grid { grid-template-columns: 1fr; }
  .qr-row { justify-content: center; }
  .video-detail-grid { grid-template-columns: 1fr; }
  .sidebar-related { display: none; }
  .howto-steps { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .howto-steps { grid-template-columns: 1fr; }
}

/* === 标签云副标题 h6 === */
.tag-sub-title {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 400;
  line-height: 1.8;
}
.tag-sub-title span {
  color: var(--orange-light);
  font-weight: 600;
}