/* ========================================
   困困兔 - 汽车改装视频社区 原创样式表
   品牌色系：赛车红 #E8372C | 深夜蓝 #1A1A2E | 金属金 #FFB800
   ======================================== */

/* === 基础重置与全局 === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:#0D0D1A;color:#F0F0F0;line-height:1.7;overflow-x:hidden}
a{color:#FFB800;text-decoration:none;transition:color .3s}
a:hover{color:#E8372C}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}

/* === 容器 === */
.container{max-width:1280px;margin:0 auto;padding:0 20px}
.section-wrap{padding:60px 0}

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

/* === 头部导航 === */
.site-header{background:rgba(26,26,46,.97);position:sticky;top:0;z-index:1000;border-bottom:2px solid #E8372C;backdrop-filter:blur(12px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;max-width:1280px;margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:48px;width:auto}
.logo-wrap .brand-name{font-size:1.5rem;font-weight:800;color:#FFB800;letter-spacing:2px}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:12px 16px;font-size:.95rem;color:#F0F0F0;transition:all .3s;position:relative}
.main-nav a:hover,.main-nav a.active{color:#FFB800}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:#E8372C;transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover::after{width:70%}
.mobile-menu-btn{display:none;background:none;border:none;color:#FFB800;font-size:1.5rem;cursor:pointer}

/* === 搜索栏 === */
.search-bar{background:rgba(22,22,42,.9);padding:12px 0;border-bottom:1px solid rgba(255,184,0,.15)}
.search-bar .container{display:flex;justify-content:center}
.search-box{display:flex;max-width:600px;width:100%}
.search-box input{flex:1;padding:10px 18px;border:2px solid rgba(232,55,44,.4);border-right:none;border-radius:25px 0 0 25px;background:rgba(13,13,26,.8);color:#F0F0F0;font-size:.95rem;outline:none;transition:border-color .3s}
.search-box input:focus{border-color:#E8372C}
.search-box button{padding:10px 24px;background:linear-gradient(135deg,#E8372C,#c42a20);color:#fff;border:none;border-radius:0 25px 25px 0;cursor:pointer;font-size:.95rem;transition:background .3s}
.search-box button:hover{background:linear-gradient(135deg,#FFB800,#e0a200)}

/* === Hero Banner === */
.hero-section{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden;background:#0D0D1A}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.45)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,13,26,.85),rgba(26,26,46,.6),rgba(232,55,44,.15))}
.hero-content{position:relative;z-index:2;max-width:700px;padding:40px 20px}
.hero-content h1{font-size:2.8rem;color:#FFB800;margin-bottom:16px;text-shadow:0 2px 20px rgba(232,55,44,.4)}
.hero-content h1 span{color:#E8372C}
.hero-content p{font-size:1.15rem;color:#ddd;margin-bottom:24px;line-height:1.8}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:12px 32px;background:linear-gradient(135deg,#E8372C,#c42a20);color:#fff;border-radius:30px;font-weight:600;font-size:1rem;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(232,55,44,.4);color:#fff}
.btn-secondary{display:inline-block;padding:12px 32px;background:transparent;color:#FFB800;border:2px solid #FFB800;border-radius:30px;font-weight:600;font-size:1rem;transition:all .3s;cursor:pointer}
.btn-secondary:hover{background:#FFB800;color:#1A1A2E;transform:translateY(-2px)}

/* === 区块标题 === */
.section-title{text-align:center;margin-bottom:45px}
.section-title h2{font-size:2rem;color:#FFB800;margin-bottom:10px;position:relative;display:inline-block}
.section-title h2::after{content:'';display:block;width:60px;height:3px;background:#E8372C;margin:10px auto 0}
.section-title p{color:#aaa;font-size:1rem;margin-top:8px}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.video-card{background:#16162A;border-radius:12px;overflow:hidden;transition:all .4s;border:1px solid rgba(255,184,0,.08);position:relative}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(232,55,44,.2);border-color:rgba(232,55,44,.3)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:64px;height:64px;background:rgba(232,55,44,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .4s;cursor:pointer}
.play-btn::after{content:'';border-style:solid;border-width:12px 0 12px 22px;border-color:transparent transparent transparent #fff;margin-left:4px}
.video-card:hover .play-btn{transform:translate(-50%,-50%) scale(1)}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.8);color:#fff;padding:2px 8px;border-radius:4px;font-size:.8rem}
.video-info{padding:16px}
.video-info h3{font-size:1.05rem;color:#F0F0F0;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:16px;color:#888;font-size:.85rem}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:2px 10px;background:rgba(232,55,44,.15);color:#E8372C;border-radius:12px;font-size:.75rem;margin-top:8px}

/* === 模块卡片 === */
.module-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.module-card{background:linear-gradient(145deg,#16162A,#1e1e38);border-radius:14px;padding:30px 24px;text-align:center;transition:all .4s;border:1px solid rgba(255,184,0,.06)}
.module-card:hover{transform:translateY(-5px);box-shadow:0 10px 35px rgba(232,55,44,.15);border-color:rgba(255,184,0,.2)}
.module-card .icon{font-size:2.5rem;margin-bottom:16px;display:block}
.module-card h3{color:#FFB800;font-size:1.15rem;margin-bottom:10px}
.module-card p{color:#aaa;font-size:.9rem;line-height:1.6}

/* === 专家展示 === */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:28px}
.expert-card{background:#16162A;border-radius:14px;overflow:hidden;transition:all .4s;border:1px solid rgba(255,184,0,.08)}
.expert-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgba(232,55,44,.2)}
.expert-photo{width:100%;aspect-ratio:4/3;object-fit:cover}
.expert-info{padding:20px}
.expert-info h3{color:#FFB800;font-size:1.15rem;margin-bottom:4px}
.expert-info .role{color:#E8372C;font-size:.9rem;margin-bottom:10px}
.expert-info p{color:#aaa;font-size:.88rem;line-height:1.6;margin-bottom:12px}
.expert-tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:14px}
.expert-tags span{padding:3px 10px;background:rgba(232,55,44,.12);color:#E8372C;border-radius:12px;font-size:.78rem}
.expert-btns{display:flex;gap:10px}
.expert-btns a{padding:6px 16px;border-radius:20px;font-size:.85rem;transition:all .3s}
.expert-btns .btn-contact{background:#E8372C;color:#fff}
.expert-btns .btn-works{border:1px solid #FFB800;color:#FFB800}
.expert-btns a:hover{transform:translateY(-2px)}

/* === 品牌Logo墙 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;padding:20px 0}
.brand-item{width:120px;height:60px;background:rgba(22,22,42,.8);border-radius:10px;display:flex;align-items:center;justify-content:center;border:1px solid rgba(255,184,0,.1);transition:all .3s;color:#888;font-size:.85rem;font-weight:600}
.brand-item:hover{border-color:#FFB800;background:rgba(255,184,0,.08);color:#FFB800}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#16162A;border-radius:10px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(255,184,0,.08)}
.faq-question{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:#F0F0F0;font-weight:600;transition:all .3s}
.faq-question:hover{color:#FFB800}
.faq-question .arrow{color:#E8372C;font-size:1.2rem;transition:transform .3s}
.faq-question.active .arrow{transform:rotate(180deg)}
.faq-answer{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s;color:#aaa;line-height:1.7}
.faq-answer.show{padding:0 24px 18px;max-height:500px}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.review-card{background:#16162A;border-radius:12px;padding:24px;border:1px solid rgba(255,184,0,.08);transition:all .3s}
.review-card:hover{border-color:rgba(232,55,44,.3)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,#E8372C,#FFB800);display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:#fff;font-weight:700}
.review-user .name{color:#F0F0F0;font-weight:600}
.review-user .date{color:#666;font-size:.8rem}
.review-stars{color:#FFB800;margin-bottom:10px;font-size:.9rem}
.review-text{color:#bbb;font-size:.92rem;line-height:1.7}

/* === 联系我们 === */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.contact-card{background:#16162A;border-radius:12px;padding:24px;text-align:center;border:1px solid rgba(255,184,0,.08);transition:all .3s}
.contact-card:hover{border-color:#FFB800}
.contact-card .icon{font-size:2rem;margin-bottom:12px;display:block}
.contact-card h4{color:#FFB800;margin-bottom:8px}
.contact-card p{color:#aaa;font-size:.9rem}

/* === 社交分享 === */
.share-bar{display:flex;justify-content:center;gap:16px;padding:20px 0}
.share-btn{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.1rem;transition:all .3s;cursor:pointer;border:none}
.share-btn:hover{transform:translateY(-3px) scale(1.1)}
.share-wechat{background:#07C160;color:#fff}
.share-weibo{background:#E6162D;color:#fff}
.share-douyin{background:#161823;color:#fff;border:1px solid #444}
.share-bilibili{background:#00A1D6;color:#fff}
.share-qq{background:#12B7F5;color:#fff}

/* === 页脚 === */
.site-footer{background:#0a0a16;border-top:2px solid rgba(232,55,44,.3);padding:40px 0 0}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;margin-bottom:30px}
.footer-col h4{color:#FFB800;margin-bottom:14px;font-size:1rem}
.footer-col p,.footer-col a{color:#888;font-size:.88rem;line-height:2}
.footer-col a:hover{color:#FFB800}
.footer-qr{display:flex;gap:20px;justify-content:center}
.footer-qr .qr-item{text-align:center}
.footer-qr .qr-item img{width:120px;height:120px;border-radius:8px;border:2px solid rgba(255,184,0,.15)}
.footer-qr .qr-item p{color:#888;font-size:.8rem;margin-top:6px}
.footer-bottom{text-align:center;padding:20px 0;border-top:1px solid rgba(255,184,0,.08);color:#666;font-size:.85rem}

/* === 面包屑 === */
.breadcrumb{padding:12px 0;color:#888;font-size:.88rem}
.breadcrumb a{color:#FFB800}
.breadcrumb span{margin:0 8px;color:#555}

/* === How-To指南 === */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px;margin-top:24px}
.howto-step{background:#16162A;border-radius:12px;padding:24px;text-align:center;position:relative;border:1px solid rgba(255,184,0,.08)}
.howto-step .step-num{width:40px;height:40px;background:linear-gradient(135deg,#E8372C,#FFB800);border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;margin:0 auto 14px;font-size:1.1rem}
.howto-step h4{color:#FFB800;margin-bottom:8px}
.howto-step p{color:#aaa;font-size:.88rem}

/* === 社区分类标签 === */
.category-tabs{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:30px}
.category-tab{padding:8px 22px;border-radius:25px;background:rgba(22,22,42,.8);color:#aaa;border:1px solid rgba(255,184,0,.1);cursor:pointer;transition:all .3s;font-size:.9rem}
.category-tab:hover,.category-tab.active{background:rgba(232,55,44,.15);color:#E8372C;border-color:#E8372C}

/* === 数据统计条 === */
.stats-bar{display:flex;justify-content:center;gap:40px;padding:30px 0;flex-wrap:wrap}
.stat-item{text-align:center}
.stat-item .num{font-size:2.2rem;font-weight:800;color:#FFB800;display:block}
.stat-item .label{color:#888;font-size:.88rem;margin-top:4px}

/* === 响应式 === */
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.show{display:flex}
  .main-nav a{padding:10px 16px;border-bottom:1px solid rgba(255,184,0,.05)}
  .mobile-menu-btn{display:block}
  .hero-content h1{font-size:1.8rem}
  .hero-section{min-height:400px}
  .video-grid{grid-template-columns:1fr}
  .module-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .stats-bar{gap:20px}
  .stat-item .num{font-size:1.6rem}
  .section-wrap{padding:40px 0}
  .section-title h2{font-size:1.5rem}
  .search-box{max-width:100%}
  .hero-btns{flex-direction:column;align-items:flex-start}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.5rem}
  .video-grid{grid-template-columns:1fr}
  .brand-wall{gap:15px}
  .brand-item{width:90px;height:45px;font-size:.75rem}
}