/* ============================================
   困困兔汽车改装 - 原创样式表
   配色方案：碳纤维黑 #0d0d0d / 钛金蓝 #1a6bff / 
   赛道红 #e63946 / 铂金灰 #b0b3b8 / 暗夜灰 #1c1c2e
   ============================================ */

/* === 基础重置 === */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:#0d0d0d;color:#e0e0e0;line-height:1.7;overflow-x:hidden}
a{color:#1a6bff;text-decoration:none;transition:color .3s}
a:hover{color:#4d94ff}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1280px;margin:0 auto;padding:0 20px}

/* === 干扰标签隐藏 === */
.kkt-noise{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;opacity:0;pointer-events:none}

/* === 顶部导航 === */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(13,13,13,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(26,107,255,.15);transition:all .3s}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;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:1.35rem;font-weight:700;color:#fff;letter-spacing:1px}
.logo-text span{display:block;font-size:.7rem;color:#1a6bff;font-weight:400;letter-spacing:2px}
.main-nav{display:flex;gap:6px}
.main-nav a{padding:8px 14px;font-size:.9rem;color:#b0b3b8;border-radius:6px;transition:all .3s}
.main-nav a:hover,.main-nav a.active{color:#fff;background:rgba(26,107,255,.15)}
.nav-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;transition:all .3s}

/* === 搜索栏 === */
.search-bar{background:linear-gradient(135deg,#1c1c2e 0%,#0d0d0d 100%);padding:14px 0;border-bottom:1px solid rgba(26,107,255,.1)}
.search-wrap{max-width:680px;margin:0 auto;position:relative}
.search-input{width:100%;padding:12px 50px 12px 20px;background:rgba(255,255,255,.06);border:1px solid rgba(26,107,255,.25);border-radius:30px;color:#fff;font-size:.95rem;outline:none;transition:border-color .3s}
.search-input:focus{border-color:#1a6bff;box-shadow:0 0 20px rgba(26,107,255,.15)}
.search-input::placeholder{color:#666}
.search-btn{position:absolute;right:6px;top:50%;transform:translateY(-50%);background:#1a6bff;border:none;color:#fff;width:38px;height:38px;border-radius:50%;cursor:pointer;font-size:1.1rem;transition:background .3s}
.search-btn:hover{background:#4d94ff}

/* === 英雄横幅 === */
.hero-section{position:relative;height:75vh;min-height:480px;overflow:hidden;margin-top:68px}
.hero-section img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,13,13,.3) 0%,rgba(13,13,13,.85) 100%);display:flex;align-items:flex-end;padding:0 0 60px}
.hero-content{max-width:1280px;margin:0 auto;padding:0 20px;width:100%}
.hero-content h1{font-size:2.8rem;font-weight:800;color:#fff;margin-bottom:12px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-content h1 em{font-style:normal;color:#1a6bff}
.hero-content p{font-size:1.15rem;color:#b0b3b8;max-width:680px;margin-bottom:24px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;background:linear-gradient(135deg,#1a6bff,#0044cc);color:#fff;border-radius:8px;font-weight:600;font-size:.95rem;transition:all .3s;border:none;cursor:pointer}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(26,107,255,.35);color:#fff}
.btn-outline{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border:1px solid rgba(26,107,255,.5);color:#1a6bff;border-radius:8px;font-weight:600;font-size:.95rem;transition:all .3s;background:transparent;cursor:pointer}
.btn-outline:hover{background:rgba(26,107,255,.1);border-color:#1a6bff;color:#4d94ff}

/* === 通用板块 === */
.section{padding:70px 0}
.section-dark{background:#111118}
.section-alt{background:linear-gradient(180deg,#0d0d0d 0%,#111118 50%,#0d0d0d 100%)}
.section-header{text-align:center;margin-bottom:45px}
.section-header h2{font-size:2rem;font-weight:700;color:#fff;margin-bottom:10px}
.section-header h2 em{font-style:normal;color:#1a6bff}
.section-header p{color:#888;font-size:1rem;max-width:600px;margin:0 auto}
.section-header h3{font-size:1.5rem;color:#fff;margin-bottom:8px}

/* === 视频卡片网格 === */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.video-card{position:relative;border-radius:12px;overflow:hidden;background:#1c1c2e;transition:transform .35s,box-shadow .35s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(26,107,255,.2)}
.video-card .thumb{position:relative;aspect-ratio:16/9;overflow:hidden}
.video-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.video-card:hover .thumb img{transform:scale(1.08)}
.video-card .play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0);width:60px;height:60px;background:rgba(26,107,255,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .35s;opacity:0}
.video-card:hover .play-btn{transform:translate(-50%,-50%) scale(1);opacity:1}
.play-btn::after{content:"";display:block;width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent #fff;margin-left:3px}
.video-card .card-body{padding:16px}
.video-card .card-body h4{font-size:1rem;color:#fff;margin-bottom:6px;font-weight:600}
.video-card .card-body p{font-size:.82rem;color:#888;line-height:1.5}
.video-card .card-meta{display:flex;gap:14px;padding:0 16px 14px;font-size:.78rem;color:#666}
.video-card .card-meta span{display:flex;align-items:center;gap:4px}
.video-card .duration{position:absolute;bottom:10px;right:10px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}

/* === 专家卡片 === */
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.expert-card{background:#1c1c2e;border-radius:12px;padding:28px;text-align:center;border:1px solid rgba(26,107,255,.08);transition:all .3s}
.expert-card:hover{border-color:rgba(26,107,255,.3);box-shadow:0 8px 30px rgba(26,107,255,.1)}
.expert-card .avatar{width:80px;height:80px;border-radius:50%;margin:0 auto 14px;background:linear-gradient(135deg,#1a6bff,#0044cc);display:flex;align-items:center;justify-content:center;font-size:1.8rem;color:#fff;font-weight:700}
.expert-card h4{color:#fff;font-size:1.05rem;margin-bottom:4px}
.expert-card .title{color:#1a6bff;font-size:.82rem;margin-bottom:10px}
.expert-card p{color:#888;font-size:.85rem;line-height:1.6}
.expert-card .expert-btns{display:flex;gap:10px;justify-content:center;margin-top:14px}
.expert-card .expert-btns a{padding:6px 16px;border-radius:6px;font-size:.8rem}

/* === FAQ === */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#1c1c2e;border-radius:10px;margin-bottom:12px;border:1px solid rgba(26,107,255,.08);overflow:hidden}
.faq-q{padding:18px 22px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;color:#fff;font-weight:600;font-size:.95rem;transition:background .3s}
.faq-q:hover{background:rgba(26,107,255,.05)}
.faq-q::after{content:"+";font-size:1.3rem;color:#1a6bff;transition:transform .3s}
.faq-item.open .faq-q::after{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 22px}
.faq-item.open .faq-a{max-height:300px;padding:0 22px 18px}
.faq-a p{color:#999;font-size:.9rem;line-height:1.7}

/* === 用户评论 === */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.review-card{background:#1c1c2e;border-radius:12px;padding:24px;border:1px solid rgba(26,107,255,.06)}
.review-header{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.review-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#e63946,#1a6bff);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:1rem}
.review-info h5{color:#fff;font-size:.92rem}
.review-info span{color:#666;font-size:.78rem}
.review-stars{color:#ffc107;font-size:.85rem;margin-bottom:8px;letter-spacing:2px}
.review-card p{color:#999;font-size:.88rem;line-height:1.6}

/* === 合作品牌墙 === */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;padding:20px 0}
.brand-wall .brand-item{width:120px;height:60px;background:rgba(255,255,255,.04);border-radius:8px;display:flex;align-items:center;justify-content:center;color:#666;font-size:.85rem;font-weight:600;border:1px solid rgba(255,255,255,.06);transition:all .3s}
.brand-wall .brand-item:hover{border-color:rgba(26,107,255,.3);color:#1a6bff;background:rgba(26,107,255,.05)}

/* === 社区指南 === */
.guide-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.guide-step{background:#1c1c2e;border-radius:12px;padding:28px 20px;text-align:center;position:relative;border:1px solid rgba(26,107,255,.08)}
.guide-step::before{counter-increment:step;content:counter(step);position:absolute;top:-14px;left:50%;transform:translateX(-50%);width:28px;height:28px;background:#1a6bff;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.85rem}
.guide-step h4{color:#fff;margin:10px 0 8px;font-size:.95rem}
.guide-step p{color:#888;font-size:.82rem}

/* === 社交分享 === */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;padding:20px 0}
.share-bar a{width:44px;height:44px;border-radius:50%;background:rgba(26,107,255,.1);display:flex;align-items:center;justify-content:center;color:#1a6bff;font-size:1rem;transition:all .3s;border:1px solid rgba(26,107,255,.2)}
.share-bar a:hover{background:#1a6bff;color:#fff;transform:translateY(-3px)}

/* === 页脚 === */
.site-footer{background:#080810;border-top:1px solid rgba(26,107,255,.1);padding:50px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px;margin-bottom:40px}
.footer-col h4{color:#fff;font-size:1rem;margin-bottom:16px;position:relative;padding-bottom:10px}
.footer-col h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:#1a6bff}
.footer-col p{color:#888;font-size:.85rem;line-height:1.7}
.footer-col a{display:block;color:#888;font-size:.85rem;padding:4px 0;transition:color .3s}
.footer-col a:hover{color:#1a6bff}
.footer-col .qr-img{width:120px;border-radius:8px;margin-top:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:20px 0;text-align:center}
.footer-bottom p{color:#555;font-size:.82rem}
.update-time{color:#666;font-size:.78rem;margin-top:4px}

/* === 面包屑 === */
.breadcrumb{padding:20px 0 10px;font-size:.85rem;color:#666}
.breadcrumb a{color:#1a6bff}
.breadcrumb span{margin:0 8px;color:#444}

/* === 内页通用 === */
.page-hero{padding:100px 0 40px;background:linear-gradient(180deg,#1c1c2e,#0d0d0d);text-align:center}
.page-hero h1{font-size:2.2rem;color:#fff;margin-bottom:10px}
.page-hero p{color:#888;max-width:600px;margin:0 auto}
.content-section{padding:50px 0}
.content-section h2{font-size:1.6rem;color:#fff;margin-bottom:16px}
.content-section h3{font-size:1.25rem;color:#e0e0e0;margin:20px 0 10px}
.content-section p{color:#999;margin-bottom:14px;line-height:1.8}
.content-section ul{padding-left:20px}
.content-section ul li{color:#999;padding:4px 0;position:relative;padding-left:16px}
.content-section ul li::before{content:"▸";position:absolute;left:0;color:#1a6bff}

/* === 联系页面 === */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.contact-info-card{background:#1c1c2e;border-radius:12px;padding:30px;border:1px solid rgba(26,107,255,.08)}
.contact-info-card h3{color:#fff;margin-bottom:16px;font-size:1.15rem}
.contact-info-card .info-item{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.04)}
.contact-info-card .info-item:last-child{border-bottom:none}
.contact-info-card .info-label{color:#1a6bff;font-size:.85rem;min-width:80px}
.contact-info-card .info-value{color:#ccc;font-size:.9rem}
.contact-form{background:#1c1c2e;border-radius:12px;padding:30px;border:1px solid rgba(26,107,255,.08)}
.contact-form h3{color:#fff;margin-bottom:16px;font-size:1.15rem}
.form-group{margin-bottom:16px}
.form-group label{display:block;color:#b0b3b8;font-size:.85rem;margin-bottom:6px}
.form-group input,.form-group textarea,.form-group select{width:100%;padding:10px 14px;background:rgba(255,255,255,.04);border:1px solid rgba(26,107,255,.15);border-radius:8px;color:#fff;font-size:.9rem;outline:none;transition:border-color .3s}
.form-group input:focus,.form-group textarea:focus{border-color:#1a6bff}
.form-group textarea{height:100px;resize:vertical}

/* === AI赋能板块 === */
.ai-features{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.ai-card{background:linear-gradient(145deg,#1c1c2e,#151525);border-radius:14px;padding:30px;border:1px solid rgba(26,107,255,.1);transition:all .3s;text-align:center}
.ai-card:hover{border-color:rgba(26,107,255,.35);transform:translateY(-4px)}
.ai-card .ai-icon{width:56px;height:56px;margin:0 auto 16px;background:linear-gradient(135deg,#1a6bff,#0044cc);border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:1.5rem}
.ai-card h4{color:#fff;font-size:1.05rem;margin-bottom:8px}
.ai-card p{color:#888;font-size:.85rem;line-height:1.6}

/* === 响应式 === */
@media(max-width:1024px){
  .video-grid,.expert-grid,.ai-features{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .guide-steps{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:68px;left:0;width:100%;background:#0d0d0d;flex-direction:column;padding:20px;border-top:1px solid rgba(26,107,255,.1)}
  .main-nav.open{display:flex}
  .nav-toggle{display:flex}
  .hero-content h1{font-size:1.8rem}
  .hero-section{height:55vh}
  .video-grid,.expert-grid,.ai-features,.review-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .guide-steps{grid-template-columns:1fr}
  .section-header h2{font-size:1.5rem}
  .section{padding:45px 0}
  .header-inner{height:58px}
  .hero-section{margin-top:58px}
}
@media(max-width:480px){
  .hero-content h1{font-size:1.4rem}
  .hero-content p{font-size:.95rem}
  .btn-primary,.btn-outline{padding:10px 20px;font-size:.85rem}
}