/* ============================================================
   困困兔 汽车改装视频社区 - 原创样式表
   配色：深海蓝 #0f1b2d | 活力橙 #e8621a | 暖灰 #f4f1ec
   ============================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--navy:#0f1b2d;--orange:#e8621a;--cream:#f4f1ec;--dark:#1a1a2e;--gray:#6b7280;--light:#fafaf8;--card:#ffffff;--shadow:0 2px 12px rgba(15,27,45,.08);--radius:10px}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#2d2d3a;background:var(--cream);line-height:1.7;overflow-x:hidden}
a{color:var(--orange);text-decoration:none;transition:color .2s}
a:hover{color:#c44e0e}
img{max-width:100%;height:auto;display:block}
.container{max-width:1180px;margin:0 auto;padding:0 20px}

/* === 顶部栏 === */
.topbar{background:var(--navy);color:#fff;padding:6px 0;font-size:13px;text-align:center;letter-spacing:.5px}
.topbar a{color:var(--orange)}

/* === 导航 === */
.navbar{background:#fff;border-bottom:1px solid #e5e2dc;position:sticky;top:0;z-index:100;box-shadow:0 1px 6px rgba(0,0,0,.04)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:0 20px;max-width:1180px;margin:0 auto;height:64px}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo img{height:42px;width:42px;border-radius:6px}
.nav-logo strong{font-size:20px;color:var(--navy);letter-spacing:1px}
.nav-links{display:flex;gap:6px;list-style:none}
.nav-links a{display:block;padding:8px 14px;border-radius:6px;color:#3a3a4a;font-size:14px;font-weight:500;transition:all .2s}
.nav-links a:hover,.nav-links a.active{background:var(--orange);color:#fff}
.nav-search{position:relative}
.nav-search input{width:200px;padding:7px 34px 7px 14px;border:1px solid #ddd;border-radius:20px;font-size:13px;outline:none;transition:border .2s}
.nav-search input:focus{border-color:var(--orange)}
.nav-search button{position:absolute;right:4px;top:50%;transform:translateY(-50%);background:var(--orange);border:none;color:#fff;width:28px;height:28px;border-radius:50%;cursor:pointer;font-size:14px}
.mobile-toggle{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--navy)}

/* === Hero === */
.hero{position:relative;background:var(--navy);color:#fff;overflow:hidden}
.hero-bg{width:100%;height:480px;object-fit:cover;opacity:.55}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px}
.hero h1{font-size:42px;font-weight:800;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.4)}
.hero h1 span{color:var(--orange)}
.hero p{font-size:18px;max-width:640px;opacity:.9;margin-bottom:24px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.btn{display:inline-block;padding:12px 28px;border-radius:8px;font-weight:600;font-size:15px;transition:all .25s;cursor:pointer;border:none}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:#c44e0e;color:#fff}
.btn-outline{border:2px solid #fff;color:#fff;background:transparent}
.btn-outline:hover{background:#fff;color:var(--navy)}

/* === 滚动通知 === */
.notice-bar{background:var(--dark);color:#ccc;padding:10px 0;overflow:hidden;font-size:13px}
.notice-bar .scroll-wrap{display:flex;animation:scrollNotice 30s linear infinite;white-space:nowrap}
.notice-bar span{margin-right:60px;color:#e0d8cc}
@keyframes scrollNotice{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

/* === 通用板块 === */
.section{padding:56px 0}
.section-alt{background:#fff}
.section-dark{background:var(--navy);color:#fff}
.section-title{text-align:center;margin-bottom:36px}
.section-title h2{font-size:28px;color:var(--navy);margin-bottom:8px}
.section-dark .section-title h2{color:#fff}
.section-title p{color:var(--gray);font-size:15px}
.section-dark .section-title p{color:#aaa}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:22px}
.video-card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s;cursor:pointer}
.video-card:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(15,27,45,.12)}
.video-thumb{position:relative;padding-top:56.25%;background:#1a1a2e;overflow:hidden}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .3s}
.video-card:hover .video-thumb img{transform:scale(1.05)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(15,27,45,.35)}
.video-card:hover .play-btn{opacity:1}
.play-btn i{width:52px;height:52px;background:var(--orange);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;box-shadow:0 4px 16px rgba(232,98,26,.4)}
.video-dur{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px}
.video-info{padding:14px 16px}
.video-info h3{font-size:15px;color:#2d2d3a;margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:12px;color:var(--gray)}
.video-meta span{display:flex;align-items:center;gap:3px}
.tag{display:inline-block;padding:3px 10px;border-radius:12px;font-size:11px;background:#eee;color:#555;margin-right:4px}
.tag.hot{background:var(--orange);color:#fff}

/* === 统计条 === */
.stats-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:30px 0}
.stat-item{text-align:center}
.stat-item .num{font-size:36px;font-weight:800;color:var(--orange)}
.stat-item .label{font-size:14px;color:#aaa;margin-top:4px}

/* === 专家/团队 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:22px}
.expert-card{background:var(--card);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow)}
.expert-card .avatar{width:80px;height:80px;border-radius:50%;background:var(--navy);margin:0 auto 14px;display:flex;align-items:center;justify-content:center;font-size:32px;color:var(--orange)}
.expert-card h4{font-size:16px;color:var(--navy);margin-bottom:4px}
.expert-card .role{font-size:13px;color:var(--gray);margin-bottom:10px}
.expert-card p{font-size:13px;color:#555;line-height:1.6;margin-bottom:14px}
.expert-card .btn{padding:8px 18px;font-size:13px}

/* === 品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;padding:20px 0}
.brand-wall .bw-item{width:100px;height:50px;background:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--navy);font-size:13px;box-shadow:var(--shadow)}

/* === FAQ === */
.faq-list{max-width:780px;margin:0 auto}
.faq-item{background:var(--card);border-radius:var(--radius);margin-bottom:12px;box-shadow:var(--shadow);overflow:hidden}
.faq-q{padding:16px 20px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-size:15px;color:var(--navy)}
.faq-q::after{content:"+";font-size:20px;color:var(--orange);transition:transform .2s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;font-size:14px;color:#555;line-height:1.7}
.faq-item.open .faq-a{max-height:300px;padding:0 20px 16px}

/* === 评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:var(--card);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.review-card .stars{color:var(--orange);font-size:16px;margin-bottom:8px}
.review-card h4{font-size:15px;color:var(--navy);margin-bottom:4px}
.review-card .r-meta{font-size:12px;color:var(--gray);margin-bottom:10px}
.review-card p{font-size:13px;color:#555;line-height:1.6}

/* === 联系/二维码 === */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-info{font-size:14px;color:#555;line-height:2}
.contact-info h3{color:var(--navy);font-size:18px;margin-bottom:12px}
.qr-row{display:flex;gap:24px}
.qr-box{text-align:center}
.qr-box img{width:140px;height:140px;border-radius:8px;margin-bottom:6px}
.qr-box span{font-size:12px;color:var(--gray)}

/* === 关键词墙 === */
.kw-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;padding:10px 0}
.kw-wall span{padding:5px 14px;background:#fff;border-radius:16px;font-size:12px;color:#555;box-shadow:0 1px 4px rgba(0,0,0,.06)}

/* === 分享 === */
.share-bar{display:flex;justify-content:center;gap:14px;padding:20px 0}
.share-bar a{width:40px;height:40px;border-radius:50%;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;font-size:16px;transition:background .2s}
.share-bar a:hover{background:var(--orange)}

/* === How-To === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.step-card{background:var(--card);border-radius:var(--radius);padding:24px;text-align:center;box-shadow:var(--shadow)}
.step-card .step-num{width:44px;height:44px;border-radius:50%;background:var(--orange);color:#fff;font-size:20px;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.step-card h4{font-size:15px;color:var(--navy);margin-bottom:8px}
.step-card p{font-size:13px;color:#555;line-height:1.6}

/* === 页脚 === */
.footer{background:var(--navy);color:#aaa;padding:40px 0 20px;font-size:13px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer ul{list-style:none}
.footer li{margin-bottom:8px}
.footer a{color:#aaa}
.footer a:hover{color:var(--orange)}
.footer-brand p{line-height:1.8}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:16px;text-align:center;color:#666}
.footer-bottom a{color:var(--orange)}

/* === 面包屑 === */
.breadcrumb{padding:14px 0;font-size:13px;color:var(--gray)}
.breadcrumb a{color:var(--orange)}
.breadcrumb span{margin:0 6px;color:#ccc}

/* === 内页通用 === */
.page-hero{background:var(--navy);color:#fff;padding:48px 0;text-align:center}
.page-hero h1{font-size:32px;margin-bottom:8px}
.page-hero p{color:#aaa;font-size:15px}
.content-section{padding:40px 0}

/* === 干扰标签隐藏 === */
.itf-wrap{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none;z-index:-9999}

/* === 响应式 === */
@media(max-width:768px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:10px;box-shadow:0 4px 12px rgba(0,0,0,.1)}
  .nav-links.show{display:flex}
  .mobile-toggle{display:block}
  .nav-search{display:none}
  .hero-bg{height:300px}
  .hero h1{font-size:26px}
  .hero p{font-size:14px}
  .stats-bar{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .video-grid{grid-template-columns:1fr}
}
@media(max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .qr-row{flex-direction:column;align-items:center}
  .hero h1{font-size:22px}
}