/* 福利导航汽车改装 - 原创赛车主题样式 */
/* 配色：深碳灰 #1a1a2e + 赛车红 #e63946 + 金属银 #a8b2c1 + 深蓝 #16213e */

:root {
  --primary: #e63946;
  --primary-dark: #c1121f;
  --secondary: #16213e;
  --dark: #1a1a2e;
  --darker: #0f0f1a;
  --silver: #a8b2c1;
  --light: #f1f3f5;
  --gold: #f4a261;
  --text: #e0e0e0;
  --text-muted: #8b95a5;
  --card-bg: #1e2a3a;
  --border: #2a3a4a;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
}

* { margin:0; padding:0; box-sizing:border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--darker);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: color .3s; }
a:hover { color: var(--gold); }

img { max-width: 100%; height: auto; display: block; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }

/* 头部导航 */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(15,15,26,0.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1280px; margin: 0 auto; padding: 0 20px;
}

.logo-wrap { display: flex; align-items: center; gap: 10px; }
.logo-wrap img { width: 42px; height: 42px; border-radius: 8px; }
.logo-text { font-size: 1.3rem; font-weight: 700; color: #fff; }
.logo-text span { color: var(--primary); }

.main-nav { display: flex; gap: 24px; align-items: center; }
.main-nav a {
  color: var(--text); font-size: 0.95rem; font-weight: 500;
  padding: 6px 0; border-bottom: 2px solid transparent; transition: all .3s;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--primary); border-bottom-color: var(--primary);
}

.mobile-toggle { display: none; font-size: 1.5rem; color: #fff; cursor: pointer; background: none; border: none; }

/* 搜索框 */
.search-bar {
  background: var(--secondary); border-bottom: 1px solid var(--border);
  padding: 12px 0; margin-top: 66px;
}
.search-wrap {
  max-width: 600px; margin: 0 auto; display: flex; gap: 8px;
}
.search-wrap input {
  flex: 1; padding: 10px 16px; border-radius: 25px; border: 1px solid var(--border);
  background: var(--dark); color: #fff; font-size: 0.9rem; outline: none;
}
.search-wrap input:focus { border-color: var(--primary); }
.search-wrap button {
  padding: 10px 24px; border-radius: 25px; background: var(--primary);
  color: #fff; border: none; cursor: pointer; font-weight: 600; transition: background .3s;
}
.search-wrap button:hover { background: var(--primary-dark); }

/* Hero区域 */
.hero {
  position: relative; height: 75vh; min-height: 500px;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  filter: brightness(0.5);
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.8) 0%, rgba(230,57,70,0.2) 100%);
}
.hero-content {
  position: relative; z-index: 2; text-align: center; padding: 20px;
}
.hero-badge {
  display: inline-block; background: rgba(230,57,70,0.2); border: 1px solid var(--primary);
  padding: 6px 18px; border-radius: 25px; font-size: 0.85rem; color: var(--primary);
  margin-bottom: 20px;
}
.hero-content h1 {
  font-size: 3rem; font-weight: 800; color: #fff; margin-bottom: 16px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}
.hero-content h1 span { color: var(--primary); }
.hero-desc {
  font-size: 1.1rem; color: var(--silver); max-width: 700px; margin: 0 auto 24px;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  padding: 12px 32px; background: var(--primary); color: #fff; border-radius: 30px;
  font-weight: 600; border: none; cursor: pointer; transition: all .3s;
  text-decoration: none; display: inline-block;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); color: #fff; }
.btn-outline {
  padding: 12px 32px; background: transparent; color: #fff; border: 2px solid var(--silver);
  border-radius: 30px; font-weight: 600; cursor: pointer; transition: all .3s;
  text-decoration: none; display: inline-block;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }

.hero-stats {
  display: flex; gap: 40px; justify-content: center; margin-top: 36px;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2rem; font-weight: 800; color: var(--primary); }
.hero-stat .label { font-size: 0.8rem; color: var(--text-muted); }

/* 通用段落 */
.section { padding: 70px 0; }
.section-dark { background: var(--dark); }
.section-header {
  text-align: center; margin-bottom: 48px;
}
.section-header h2 {
  font-size: 2rem; font-weight: 700; color: #fff; margin-bottom: 12px;
}
.section-header h2 span { color: var(--primary); }
.section-header p { color: var(--text-muted); font-size: 1rem; max-width: 600px; margin: 0 auto; }

/* 视频卡片网格 */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card-bg); border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); transition: all .3s; cursor: pointer;
  position: relative;
}
.video-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--primary); }
.video-card .thumb {
  position: relative; aspect-ratio: 16/10; overflow: hidden;
}
.video-card .thumb img {
  width: 100%; height: 100%; object-fit: cover; transition: transform .5s;
}
.video-card:hover .thumb img { transform: scale(1.05); }
.video-card .play-btn {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 56px; height: 56px; background: rgba(230,57,70,0.9); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity .3s;
}
.video-card:hover .play-btn { opacity: 1; }
.play-btn::after {
  content: ''; width: 0; height: 0;
  border-left: 18px solid #fff; border-top: 11px solid transparent; border-bottom: 11px solid transparent;
  margin-left: 4px;
}
.video-card .duration {
  position: absolute; bottom: 8px; right: 8px; background: rgba(0,0,0,0.8);
  padding: 2px 8px; border-radius: 4px; font-size: 0.75rem; color: #fff;
}
.video-card .card-body { padding: 14px; }
.video-card .card-title {
  font-size: 0.95rem; font-weight: 600; color: #fff; margin-bottom: 8px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-card .card-meta {
  display: flex; gap: 12px; font-size: 0.8rem; color: var(--text-muted);
}
.video-card .card-meta span { display: flex; align-items: center; gap: 4px; }
.video-card .tag {
  display: inline-block; background: rgba(230,57,70,0.15); color: var(--primary);
  padding: 2px 8px; border-radius: 4px; font-size: 0.7rem; margin-top: 8px;
}

/* 分类标签 */
.category-tabs {
  display: flex; gap: 12px; margin-bottom: 32px; flex-wrap: wrap; justify-content: center;
}
.category-tabs a {
  padding: 8px 20px; border-radius: 25px; background: var(--card-bg);
  color: var(--text-muted); font-size: 0.9rem; border: 1px solid var(--border); transition: all .3s;
}
.category-tabs a:hover, .category-tabs a.active {
  background: var(--primary); color: #fff; border-color: var(--primary);
}

/* 专家卡片 */
.expert-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; }
.expert-card {
  background: var(--card-bg); border-radius: var(--radius); padding: 24px;
  text-align: center; border: 1px solid var(--border); transition: all .3s;
}
.expert-card:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.expert-card .avatar {
  width: 80px; height: 80px; border-radius: 50%; margin: 0 auto 16px;
  background: var(--primary); display: flex; align-items: center; justify-content: center;
  font-size: 2rem; color: #fff;
}
.expert-card h4 { color: #fff; margin-bottom: 4px; }
.expert-card .role { color: var(--primary); font-size: 0.85rem; margin-bottom: 12px; }
.expert-card p { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 16px; }
.expert-card .expert-actions { display: flex; gap: 8px; justify-content: center; }
.expert-card .expert-actions a {
  padding: 6px 14px; border-radius: 20px; font-size: 0.8rem;
  border: 1px solid var(--border); color: var(--text);
}
.expert-card .expert-actions a:hover { border-color: var(--primary); color: var(--primary); }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card-bg); border-radius: var(--radius); margin-bottom: 12px;
  border: 1px solid var(--border); overflow: hidden;
}
.faq-question {
  padding: 18px 24px; cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; font-weight: 600; color: #fff; transition: background .3s;
}
.faq-question:hover { background: rgba(230,57,70,0.1); }
.faq-question::after { content: '+'; font-size: 1.3rem; color: var(--primary); transition: transform .3s; }
.faq-item.active .faq-question::after { content: '-'; }
.faq-answer {
  padding: 0 24px; max-height: 0; overflow: hidden; transition: all .3s;
  color: var(--text-muted); font-size: 0.9rem;
}
.faq-item.active .faq-answer { padding: 0 24px 18px; max-height: 500px; }

/* 用户评价 */
.review-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.review-card {
  background: var(--card-bg); border-radius: var(--radius); padding: 24px;
  border: 1px solid var(--border);
}
.review-card .stars { color: var(--gold); margin-bottom: 12px; font-size: 1.1rem; }
.review-card .review-text { color: var(--text); font-size: 0.9rem; margin-bottom: 16px; font-style: italic; }
.review-card .reviewer { display: flex; align-items: center; gap: 12px; }
.review-card .reviewer-avatar {
  width: 40px; height: 40px; border-radius: 50%; background: var(--primary);
  display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700;
}
.review-card .reviewer-info .name { font-weight: 600; color: #fff; font-size: 0.9rem; }
.review-card .reviewer-info .date { color: var(--text-muted); font-size: 0.8rem; }

/* 合作品牌墙 */
.brand-wall {
  display: flex; flex-wrap: wrap; gap: 24px; justify-content: center; align-items: center;
}
.brand-wall .brand-item {
  background: var(--card-bg); border-radius: var(--radius); padding: 16px 32px;
  border: 1px solid var(--border); font-weight: 700; color: var(--silver);
  font-size: 1.1rem; transition: all .3s;
}
.brand-wall .brand-item:hover { border-color: var(--primary); color: var(--primary); }

/* 联系我们 */
.contact-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 24px; }
.contact-item {
  display: flex; align-items: center; gap: 16px; background: var(--card-bg);
  padding: 20px; border-radius: var(--radius); border: 1px solid var(--border);
}
.contact-icon { font-size: 1.5rem; }
.contact-label { color: var(--text-muted); font-size: 0.8rem; }
.contact-value { color: #fff; font-weight: 600; }

/* 面包屑 */
.breadcrumb-nav {
  padding: 16px 0; margin-top: 66px;
}
.breadcrumb-nav ol {
  list-style: none; display: flex; gap: 8px; flex-wrap: wrap;
}
.breadcrumb-nav li { color: var(--text-muted); font-size: 0.85rem; }
.breadcrumb-nav li a { color: var(--silver); }
.breadcrumb-nav li + li::before { content: '/'; margin-right: 8px; color: var(--border); }

/* 页脚 */
.site-footer {
  background: var(--dark); border-top: 1px solid var(--border); padding: 60px 0 30px;
}
.footer-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 { color: #fff; margin-bottom: 16px; font-size: 1rem; }
.footer-col p, .footer-col a { color: var(--text-muted); font-size: 0.85rem; display: block; margin-bottom: 8px; }
.footer-col a:hover { color: var(--primary); }
.footer-qr { display: flex; gap: 20px; }
.footer-qr img { width: 100px; height: 100px; border-radius: 8px; }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 20px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
}
.footer-bottom p { color: var(--text-muted); font-size: 0.8rem; }
.social-icons { display: flex; gap: 12px; }
.social-icon {
  width: 36px; height: 36px; border-radius: 50%; background: var(--card-bg);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); font-size: 0.85rem; border: 1px solid var(--border); transition: all .3s;
}
.social-icon:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 分享栏 */
.share-bar { display: flex; gap: 12px; align-items: center; margin: 20px 0; }
.share-bar span { color: var(--text-muted); font-size: 0.85rem; }
.share-bar a {
  padding: 6px 14px; border-radius: 20px; font-size: 0.8rem;
  background: var(--card-bg); color: var(--text); border: 1px solid var(--border);
}
.share-bar a:hover { border-color: var(--primary); color: var(--primary); }

/* AI赋能区 */
.ai-features { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.ai-card {
  background: linear-gradient(135deg, var(--card-bg), var(--secondary));
  border-radius: var(--radius); padding: 28px; border: 1px solid var(--border); transition: all .3s;
}
.ai-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.ai-card .ai-icon { font-size: 2.5rem; margin-bottom: 16px; }
.ai-card h4 { color: #fff; margin-bottom: 8px; }
.ai-card p { color: var(--text-muted); font-size: 0.9rem; }

/* HowTo指南 */
.howto-steps { max-width: 700px; margin: 0 auto; }
.howto-step {
  display: flex; gap: 20px; margin-bottom: 24px; align-items: flex-start;
}
.howto-step .step-num {
  width: 40px; height: 40px; border-radius: 50%; background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; flex-shrink: 0;
}
.howto-step .step-content h4 { color: #fff; margin-bottom: 4px; }
.howto-step .step-content p { color: var(--text-muted); font-size: 0.9rem; }

/* Toast通知 */
.toast {
  position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%) translateY(100px);
  background: var(--primary); color: #fff; padding: 12px 28px; border-radius: 30px;
  font-size: 0.9rem; z-index: 9999; opacity: 0; transition: all .4s;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

/* 视频播放页 */
.video-player-wrap {
  position: relative; width: 100%; aspect-ratio: 16/9; background: #000;
  border-radius: var(--radius); overflow: hidden; margin-bottom: 24px;
}
.video-player-wrap video { width: 100%; height: 100%; object-fit: contain; }
.video-info h1 { font-size: 1.5rem; color: #fff; margin-bottom: 12px; }
.video-stats { display: flex; gap: 20px; color: var(--text-muted); font-size: 0.9rem; margin-bottom: 20px; }

/* 侧边栏推荐 */
.page-layout { display: grid; grid-template-columns: 1fr 340px; gap: 30px; }
.sidebar-videos { display: flex; flex-direction: column; gap: 16px; }
.sidebar-video {
  display: flex; gap: 12px; background: var(--card-bg); border-radius: 8px;
  padding: 10px; border: 1px solid var(--border); cursor: pointer; transition: all .3s;
}
.sidebar-video:hover { border-color: var(--primary); }
.sidebar-video .sv-thumb { width: 140px; height: 80px; border-radius: 6px; overflow: hidden; flex-shrink: 0; }
.sidebar-video .sv-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-video .sv-info { flex: 1; }
.sidebar-video .sv-title { font-size: 0.85rem; color: #fff; font-weight: 500; margin-bottom: 6px; }
.sidebar-video .sv-meta { font-size: 0.75rem; color: var(--text-muted); }

/* 内页hero */
.page-hero {
  padding: 100px 0 50px; background: linear-gradient(135deg, var(--dark), var(--secondary));
  text-align: center; border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: 2.2rem; color: #fff; margin-bottom: 12px; }
.page-hero h1 span { color: var(--primary); }
.page-hero p { color: var(--text-muted); max-width: 600px; margin: 0 auto; }

/* 社区帖子 */
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.post-card {
  background: var(--card-bg); border-radius: var(--radius); padding: 20px;
  border: 1px solid var(--border); transition: all .3s;
}
.post-card:hover { border-color: var(--primary); }
.post-card .post-author { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.post-card .post-avatar {
  width: 36px; height: 36px; border-radius: 50%; background: var(--primary);
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 0.8rem;
}
.post-card .post-name { color: #fff; font-weight: 600; font-size: 0.9rem; }
.post-card .post-time { color: var(--text-muted); font-size: 0.75rem; }
.post-card .post-text { color: var(--text); font-size: 0.9rem; margin-bottom: 12px; }
.post-card .post-actions { display: flex; gap: 16px; color: var(--text-muted); font-size: 0.8rem; }

/* 返回顶部 */
.back-top {
  position: fixed; bottom: 30px; right: 30px; width: 44px; height: 44px;
  background: var(--primary); border-radius: 50%; display: flex; align-items: center;
  justify-content: center; color: #fff; font-size: 1.2rem; cursor: pointer;
  opacity: 0; transition: all .3s; z-index: 999;
}
.back-top.show { opacity: 1; }
.back-top:hover { background: var(--primary-dark); }

/* 响应式 */
@media (max-width: 768px) {
  .main-nav { display: none; }
  .mobile-toggle { display: block; }
  .main-nav.open {
    display: flex; flex-direction: column; position: absolute;
    top: 100%; left: 0; right: 0; background: var(--darker);
    padding: 20px; gap: 16px; border-bottom: 1px solid var(--border);
  }
  .hero-content h1 { font-size: 2rem; }
  .hero-stats { gap: 20px; }
  .hero-stat .num { font-size: 1.4rem; }
  .page-layout { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero { min-height: 400px; }
  .hero-content h1 { font-size: 1.6rem; }
  .section-header h2 { font-size: 1.5rem; }
  .video-grid { grid-template-columns: 1fr; }
}