/* ============================================
   国产主播 - 汽车改装视频社区
   主样式文件 | bdxixs.cn
   ============================================ */

:root {
  --primary: #0A0E27;
  --secondary: #00D4FF;
  --accent: #FFD700;
  --accent2: #FF6B35;
  --dark: #060818;
  --card-bg: #111428;
  --card-border: #1e2545;
  --text-main: #e8eaf6;
  --text-muted: #8892b0;
  --text-light: #ccd6f6;
  --gradient-hero: linear-gradient(135deg, #0A0E27 0%, #0d1535 50%, #0a1628 100%);
  --gradient-card: linear-gradient(145deg, #111428, #0d1535);
  --gradient-accent: linear-gradient(90deg, #00D4FF, #0080ff);
  --gradient-gold: linear-gradient(90deg, #FFD700, #FFA500);
  --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 20px rgba(0,212,255,0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::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: var(--primary);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ---- 隐藏干扰标签 ---- */
.kkt-noise { display: none !important; visibility: hidden !important; }

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

/* ============ 通用工具类 ============ */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.text-center { text-align: center; }
.text-cyan { color: var(--secondary); }
.text-gold { color: var(--accent); }
.text-muted { color: var(--text-muted); }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.fw-bold { font-weight: 700; }
.fs-sm { font-size: 0.875rem; }

/* ============ 标题样式 ============ */
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 3rem;
}
.section-label {
  display: inline-block;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--secondary);
  font-size: 0.8rem;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 1rem;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ============ 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  border: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,212,255,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,212,255,0.6); }
.btn-gold {
  background: var(--gradient-gold);
  color: #000;
  box-shadow: 0 4px 20px rgba(255,215,0,0.3);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,215,0,0.5); }
.btn-outline {
  background: transparent;
  border: 1.5px solid var(--secondary);
  color: var(--secondary);
}
.btn-outline:hover { background: rgba(0,212,255,0.1); transform: translateY(-2px); }
.btn-sm { padding: 8px 18px; font-size: 0.85rem; }

/* ============ 顶部公告条 ============ */
.top-bar {
  background: linear-gradient(90deg, #00D4FF22, #FFD70022, #00D4FF22);
  border-bottom: 1px solid rgba(0,212,255,0.2);
  padding: 8px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  overflow: hidden;
}
.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.top-bar-marquee { flex: 1; overflow: hidden; }
.top-bar-marquee span {
  display: inline-block;
  animation: marquee 30s linear infinite;
  white-space: nowrap;
  color: var(--secondary);
}
@keyframes marquee { 0% { transform: translateX(100vw); } 100% { transform: translateX(-100%); } }
.top-bar-links a {
  color: var(--text-muted);
  text-decoration: none;
  margin-left: 16px;
  font-size: 0.8rem;
  transition: color 0.2s;
}
.top-bar-links a:hover { color: var(--secondary); }

/* ============ 导航栏 ============ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10,14,39,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,212,255,0.15);
  padding: 0;
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.navbar-brand img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name {
  font-size: 1.2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.brand-slogan { font-size: 0.7rem; color: var(--text-muted); }

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-menu a {
  display: block;
  padding: 8px 14px;
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--secondary);
  background: rgba(0,212,255,0.1);
}

/* 搜索框 */
.nav-search {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 50px;
  padding: 6px 14px;
  gap: 8px;
  flex-shrink: 0;
  width: 220px;
}
.nav-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 0.875rem;
  width: 100%;
}
.nav-search input::placeholder { color: var(--text-muted); }
.nav-search button {
  background: none;
  border: none;
  color: var(--secondary);
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
}
.nav-search button svg { width: 16px; height: 16px; }

/* 搜索提示弹窗 */
.search-toast {
  display: none;
  position: fixed;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card-bg);
  border: 1px solid var(--secondary);
  border-radius: var(--radius);
  padding: 12px 24px;
  color: var(--secondary);
  font-size: 0.9rem;
  z-index: 9999;
  box-shadow: var(--shadow-glow);
  animation: fadeInDown 0.3s ease;
}
@keyframes fadeInDown { from { opacity:0; transform: translateX(-50%) translateY(-10px); } to { opacity:1; transform: translateX(-50%) translateY(0); } }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* ============ 英雄区 ============ */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  z-index: 0;
}
.hero-bg-img {
  position: absolute;
  inset: 0;
  background-image: url('../assets/images/hero_banner.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.25;
  z-index: 1;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(10,14,39,0.95) 40%, rgba(10,14,39,0.3) 100%);
  z-index: 2;
}
.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 4;
  max-width: 680px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.4);
  border-radius: 50px;
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--secondary);
  margin-bottom: 1.5rem;
}
.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--secondary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100% { opacity:1; transform:scale(1); } 50% { opacity:0.5; transform:scale(1.3); } }

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.2rem;
}
.hero h1 .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 520px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--secondary);
  display: block;
}
.hero-stat-label { font-size: 0.8rem; color: var(--text-muted); }

.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.75rem;
  animation: bounce 2s infinite;
}
@keyframes bounce { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }
.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--secondary), transparent);
}

/* ============ 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(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,212,255,0.4);
  box-shadow: var(--shadow-glow);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0d1535;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.05); }
.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-circle {
  width: 60px;
  height: 60px;
  background: rgba(0,212,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
  box-shadow: 0 0 30px rgba(0,212,255,0.6);
}
.video-card:hover .play-circle { transform: scale(1); }
.play-circle svg { width: 24px; height: 24px; fill: #fff; margin-left: 3px; }
.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;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--secondary);
  color: #000;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-info { padding: 14px; }
.video-title {
  font-size: 0.95rem;
  font-weight: 600;
  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-stats { display: flex; gap: 12px; }
.video-stat { display: flex; align-items: center; gap: 4px; }
.video-stat svg { width: 13px; height: 13px; }

/* ============ 特性卡片 ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transition: var(--transition);
}
.feature-card:hover { transform: translateY(-4px); border-color: rgba(0,212,255,0.3); }
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
  width: 52px;
  height: 52px;
  background: rgba(0,212,255,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.5rem;
}
.feature-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-desc { font-size: 0.875rem; color: var(--text-muted); line-height: 1.6; }

/* ============ 专家卡片 ============ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover { transform: translateY(-6px); border-color: rgba(255,215,0,0.4); box-shadow: 0 8px 30px rgba(255,215,0,0.1); }
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--secondary);
  margin: 0 auto 16px;
  display: block;
}
.expert-name { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.expert-role { font-size: 0.82rem; color: var(--secondary); margin-bottom: 12px; }
.expert-desc { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 16px; line-height: 1.6; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin-bottom: 16px; }
.expert-tag {
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.2);
  color: var(--secondary);
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 20px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }

/* ============ 评价卡片 ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.review-card:hover { border-color: rgba(255,215,0,0.3); }
.review-stars { color: var(--accent); font-size: 1rem; margin-bottom: 12px; }
.review-text { font-size: 0.9rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #000;
  flex-shrink: 0;
}
.review-name { font-size: 0.9rem; font-weight: 600; }
.review-date { font-size: 0.75rem; color: var(--text-muted); }

/* ============ FAQ ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--secondary); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(0,212,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  color: var(--secondary);
  font-size: 1.1rem;
  line-height: 1;
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--secondary); color: #000; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }

/* ============ 合作品牌 ============ */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 16px 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(--secondary); color: var(--secondary); transform: translateY(-2px); }

/* ============ 联系区 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: flex-start;
}
.contact-icon {
  width: 44px;
  height: 44px;
  background: rgba(0,212,255,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-label { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.95rem; font-weight: 600; }

/* ============ 二维码区 ============ */
.qr-grid {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
}
.qr-item { text-align: center; }
.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--card-border);
  display: block;
  margin: 0 auto 8px;
}
.qr-label { font-size: 0.82rem; color: var(--text-muted); }

/* ============ 社交分享 ============ */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  border: 1px solid;
}
.share-wechat { border-color: #07C160; color: #07C160; }
.share-wechat:hover { background: #07C160; color: #fff; }
.share-weibo { border-color: #E6162D; color: #E6162D; }
.share-weibo:hover { background: #E6162D; color: #fff; }
.share-douyin { border-color: #FE2C55; color: #FE2C55; }
.share-douyin:hover { background: #FE2C55; color: #fff; }
.share-bilibili { border-color: #00A1D6; color: #00A1D6; }
.share-bilibili:hover { background: #00A1D6; color: #fff; }

/* ============ 页脚 ============ */
.footer {
  background: var(--dark);
  border-top: 1px solid var(--card-border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand img { width: 50px; margin-bottom: 12px; }
.footer-brand-name { font-size: 1.2rem; font-weight: 800; color: var(--secondary); margin-bottom: 8px; }
.footer-brand-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 16px; }
.footer-col-title { font-size: 0.95rem; font-weight: 700; color: var(--text-main); margin-bottom: 16px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--secondary); }
.footer-bottom {
  border-top: 1px solid var(--card-border);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); text-decoration: none; }
.footer-bottom a:hover { color: var(--secondary); }

/* ============ 面包屑 ============ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 16px 0;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--secondary); }
.breadcrumb-sep { color: var(--card-border); }
.breadcrumb-current { color: var(--secondary); }

/* ============ 分区背景 ============ */
.bg-dark { background: var(--dark); }
.bg-card { background: var(--card-bg); }
.section-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--card-border), transparent);
  margin: 0;
}

/* ============ 标签页 ============ */
.tab-nav {
  display: flex;
  gap: 4px;
  background: var(--card-bg);
  border-radius: 50px;
  padding: 4px;
  width: fit-content;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.tab-btn {
  padding: 8px 20px;
  border-radius: 50px;
  border: none;
  background: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.tab-btn.active {
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 600;
}
.tab-btn:hover:not(.active) { color: var(--secondary); }

/* ============ 加入社区步骤 ============ */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.step-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
}
.step-num {
  width: 44px;
  height: 44px;
  background: var(--gradient-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  margin: 0 auto 16px;
}
.step-title { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.step-desc { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }

/* ============ AI 功能卡片 ============ */
.ai-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  transition: var(--transition);
}
.ai-card:hover { border-color: rgba(0,212,255,0.4); transform: translateY(-3px); }
.ai-icon {
  width: 60px;
  height: 60px;
  background: rgba(0,212,255,0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  flex-shrink: 0;
}
.ai-content h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.ai-content p { font-size: 0.875rem; color: var(--text-muted); line-height: 1.7; }

/* ============ 统计数字 ============ */
.stats-bar {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: center;
}
.stat-item-num {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.stat-item-label { font-size: 0.82rem; color: var(--text-muted); margin-top: 4px; }

/* ============ 图片展示 ============ */
.img-card {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}
.img-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.img-card:hover img { transform: scale(1.04); }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .navbar-inner { height: 60px; }
  .nav-menu { display: none; position: fixed; top: 60px; left: 0; right: 0; background: rgba(10,14,39,0.98); flex-direction: column; padding: 20px; gap: 4px; border-bottom: 1px solid var(--card-border); }
  .nav-menu.open { display: flex; }
  .nav-search { width: 160px; }
  .hamburger { display: flex; }
  .hero { min-height: 80vh; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 1.2rem; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 50px 0; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .ai-card { flex-direction: column; }
}
@media (max-width: 480px) {
  .container { padding: 0 14px; }
  .video-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 1rem; }
  .hero-stat-num { font-size: 1.4rem; }
  .tab-nav { width: 100%; }
  .tab-btn { flex: 1; text-align: center; }
}

/* ============ 懒加载占位 ============ */
img[loading="lazy"] { background: var(--card-bg); }

/* ============ 动画 ============ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ============ 视频模态框 ============ */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  align-items: center;
  justify-content: center;
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.video-modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.2s;
}
.video-modal-close:hover { color: var(--secondary); }
.video-modal-player {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 8px;
}

/* ============ 内页横幅 ============ */
.page-hero {
  background: var(--gradient-hero);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--secondary), transparent);
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 900; margin-bottom: 0.5rem; }
.page-hero p { color: var(--text-muted); font-size: 1rem; }

/* ============ 社区卡片 ============ */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.community-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
}
.community-card:hover { transform: translateY(-4px); border-color: rgba(0,212,255,0.3); }
.community-icon { font-size: 2rem; margin-bottom: 14px; }
.community-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.community-card p { font-size: 0.875rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 12px; }
.community-stats { display: flex; gap: 16px; font-size: 0.78rem; color: var(--text-muted); }

/* ============ 媒体卡片 ============ */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.media-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.media-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-accent);
  transform: scaleX(0);
  transition: var(--transition);
}
.media-card:hover::before { transform: scaleX(1); }
.media-card:hover { transform: translateY(-4px); border-color: rgba(0,212,255,0.3); }
.media-icon { font-size: 2rem; margin-bottom: 14px; }
.media-title { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.media-desc { font-size: 0.875rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 14px; }
.media-link { font-size: 0.82rem; color: var(--secondary); font-weight: 600; }
.media-link:hover { color: var(--accent); }

/* ============ 娱乐卡片 ============ */
.ent-card {
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}
.ent-card:hover { transform: translateY(-4px); border-color: rgba(0,212,255,0.3); }
.ent-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}
.ent-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.ent-card:hover .ent-thumb img { transform: scale(1.05); }
.ent-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}
.ent-card:hover .ent-overlay { opacity: 1; }
.ent-play {
  width: 60px; height: 60px;
  background: rgba(0,212,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 30px rgba(0,212,255,0.5);
}
.ent-play svg { width: 28px; height: 28px; margin-left: 3px; }
.ent-info { padding: 20px; }
.ent-info h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.ent-info p { font-size: 0.875rem; color: var(--text-muted); line-height: 1.7; }

/* ============ 移动端竖屏视频卡片 ============ */
.mobile-video-card {
  cursor: pointer;
  transition: var(--transition);
}
.mobile-video-card:hover { transform: translateY(-4px); }
.mobile-video-thumb {
  position: relative;
  aspect-ratio: 9/16;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
}
.mobile-video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.mobile-video-card:hover .mobile-video-thumb img { transform: scale(1.05); }
.mobile-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}
.mobile-video-card:hover .mobile-play { opacity: 1; }
.mobile-play svg { width: 40px; height: 40px; }
.mobile-dur {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: 4px;
}
.mobile-title {
  font-size: 0.78rem;
  font-weight: 600;
  margin-top: 8px;
  text-align: center;
  color: var(--text-muted);
}

/* ============ 新闻列表 ============ */
.news-list { display: flex; flex-direction: column; gap: 16px; }
.news-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--gradient-card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: var(--transition);
}
.news-item:hover { border-color: rgba(0,212,255,0.3); }
.news-date { font-size: 0.78rem; color: var(--secondary); white-space: nowrap; flex-shrink: 0; margin-top: 2px; }
.news-content { flex: 1; }
.news-title {
  font-size: 0.95rem; font-weight: 700;
  color: var(--text-main);
  display: block;
  margin-bottom: 6px;
  transition: var(--transition);
}
.news-title:hover { color: var(--secondary); }
.news-desc { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }
.news-tag {
  font-size: 0.7rem;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  color: var(--secondary);
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
  flex-shrink: 0;
  align-self: flex-start;
}

/* ============ img-card overlay ============ */
.img-card-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  padding: 24px 20px 20px;
  transform: translateY(10px);
  transition: var(--transition);
}
.img-card:hover .img-card-overlay { transform: translateY(0); }
.img-card-overlay h3 { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.img-card-overlay p { font-size: 0.82rem; color: rgba(255,255,255,0.7); }

/* ============ 英雄区滚动提示 ============ */
.hero-scroll-hint {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
}
.scroll-dot {
  width: 6px; height: 6px;
  background: var(--secondary);
  border-radius: 50%;
  animation: scrollBounce 2s ease-in-out infinite;
}
@keyframes scrollBounce {
  0%,100% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(10px); opacity: 0.5; }
}

/* ============ 英雄区图片 ============ */
.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: heroZoom 20s ease-in-out infinite alternate;
}
@keyframes heroZoom {
  0% { transform: scale(1); }
  100% { transform: scale(1.05); }
}

/* ============ 统计条（5列）============ */
.stats-bar.stats-5 { grid-template-columns: repeat(5,1fr); }

/* ============ 响应式补充 ============ */
@media (max-width: 768px) {
  .community-grid { grid-template-columns: 1fr; }
  .media-grid { grid-template-columns: 1fr; }
  .news-item { flex-direction: column; gap: 10px; }
  .mobile-video-card:nth-child(n+3) { display: none; }
}
@media (max-width: 480px) {
  .community-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2,1fr); }
}