/* 高清车影 修车改装视频社区 - 原创样式 */
/* 配色：深碳黑 #0F1117 + 赛道橙 #FF6B2C + 钛灰 #8A8FA3 + 引擎红 #E63946 */
:root{
  --rn-carbon:#0F1117;
  --rn-orange:#FF6B2C;
  --rn-titanium:#8A8FA3;
  --rn-red:#E63946;
  --rn-light:#F4F5F7;
  --rn-dark:#1A1D26;
  --rn-text:#2D3142;
  --rn-white:#FFFFFF;
  --rn-border:#E2E4E9;
  --rn-shadow:0 4px 20px rgba(15,17,23,0.08);
}
*,*::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;color:var(--rn-text);background:var(--rn-white);line-height:1.7}
.wrapper{max-width:1200px;margin:0 auto;padding:0 20px}
a{color:var(--rn-orange);text-decoration:none;transition:color .2s}
a:hover{color:var(--rn-red)}
img{max-width:100%;height:auto;display:block}

/* 顶部导航 */
.site-top{background:var(--rn-carbon);position:sticky;top:0;z-index:100;box-shadow:0 2px 12px rgba(0,0,0,.3)}
.top-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo-link img{height:40px;width:auto}
.main-nav{display:flex;gap:24px}
.main-nav a{color:var(--rn-titanium);font-size:15px;font-weight:500;padding:4px 0;border-bottom:2px solid transparent;transition:all .2s}
.main-nav a:hover,.main-nav a.active{color:var(--rn-orange);border-bottom-color:var(--rn-orange)}
.search-wrap{display:flex;align-items:center;background:var(--rn-dark);border-radius:6px;overflow:hidden}
.search-wrap input{background:transparent;border:none;color:var(--rn-white);padding:8px 14px;width:200px;font-size:14px;outline:none}
.search-wrap input::placeholder{color:var(--rn-titanium)}
.search-wrap button{background:var(--rn-orange);color:var(--rn-white);border:none;padding:8px 16px;font-size:14px;cursor:pointer;transition:background .2s}
.search-wrap button:hover{background:var(--rn-red)}
.mobile-menu{display:none;background:none;border:none;color:var(--rn-white);font-size:24px;cursor:pointer}

/* Hero */
.hero-area{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden}
.hero-img{position:absolute;inset:0;background-size:cover;background-position:center;z-index:0}
.hero-mask{position:absolute;inset:0;background:linear-gradient(135deg,rgba(15,17,23,.85) 0%,rgba(15,17,23,.5) 100%);z-index:1}
.hero-content{position:relative;z-index:2;padding:80px 20px}
.hero-area h1{font-size:2.4rem;color:var(--rn-white);font-weight:800;margin-bottom:16px;line-height:1.3}
.hero-intro{color:rgba(255,255,255,.85);font-size:1.05rem;max-width:680px;margin-bottom:28px;line-height:1.8}
.hero-actions{display:flex;gap:16px;margin-bottom:24px}
.btn-main{background:var(--rn-orange);color:var(--rn-white);padding:12px 32px;border-radius:6px;font-weight:600;font-size:15px;transition:background .2s}
.btn-main:hover{background:var(--rn-red);color:var(--rn-white)}
.btn-ghost{border:2px solid var(--rn-orange);color:var(--rn-orange);padding:10px 30px;border-radius:6px;font-weight:600;font-size:15px;transition:all .2s}
.btn-ghost:hover{background:var(--rn-orange);color:var(--rn-white)}
.hero-labels{display:flex;flex-wrap:wrap;gap:10px}
.hero-labels span{background:rgba(255,107,44,.2);color:var(--rn-orange);padding:4px 14px;border-radius:20px;font-size:13px;border:1px solid rgba(255,107,44,.3)}

/* 面包屑 */
.crumb{background:var(--rn-light);padding:12px 0;font-size:14px;color:var(--rn-titanium)}
.crumb a{color:var(--rn-orange)}

/* 通用区块 */
.block-section{padding:60px 0}
.alt-bg{background:var(--rn-light)}
.sec-title{font-size:1.75rem;font-weight:700;color:var(--rn-carbon);text-align:center;margin-bottom:12px}
.sec-title::after{content:'';display:block;width:60px;height:3px;background:var(--rn-orange);margin:10px auto 0}
.sec-desc{text-align:center;color:var(--rn-titanium);max-width:640px;margin:0 auto 36px;font-size:15px}
.light{color:var(--rn-white)!important}

/* 卡片网格 */
.card-grid{display:grid;gap:24px}
.cols-2{grid-template-columns:repeat(2,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-4{grid-template-columns:repeat(4,1fr)}

/* 视频卡片 */
.vid-item{background:var(--rn-white);border-radius:10px;overflow:hidden;box-shadow:var(--rn-shadow);transition:transform .25s,box-shadow .25s}
.vid-item:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(15,17,23,.12)}
.vid-cover{position:relative;overflow:hidden;aspect-ratio:16/9}
.vid-cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.vid-item:hover .vid-cover img{transform:scale(1.05)}
.play-mask{position:absolute;inset:0;background:rgba(15,17,23,.4);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s}
.vid-item:hover .play-mask{opacity:1}
.play-icon{width:56px;height:56px;background:var(--rn-orange);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--rn-white);font-size:22px;box-shadow:0 4px 16px rgba(255,107,44,.4)}
.vid-len{position:absolute;bottom:8px;right:8px;background:rgba(15,17,23,.8);color:var(--rn-white);padding:2px 8px;border-radius:4px;font-size:12px}
.vid-item h3{padding:14px 16px 4px;font-size:15px;font-weight:600;color:var(--rn-carbon);line-height:1.4}
.vid-meta{padding:0 16px 14px;font-size:13px;color:var(--rn-titanium)}

/* Tab切换 */
.tab-bar{display:flex;justify-content:center;gap:12px;margin-bottom:28px}
.tab-item{background:var(--rn-white);border:2px solid var(--rn-border);color:var(--rn-text);padding:8px 24px;border-radius:24px;font-size:14px;cursor:pointer;transition:all .2s}
.tab-item.active,.tab-item:hover{background:var(--rn-orange);border-color:var(--rn-orange);color:var(--rn-white)}
.tab-body.hidden{display:none}

/* 功能卡片 */
.feature-box{background:var(--rn-white);border-radius:10px;padding:32px 24px;box-shadow:var(--rn-shadow);border-left:4px solid var(--rn-orange);transition:transform .2s}
.feature-box:hover{transform:translateY(-3px)}
.feature-box h3{font-size:1.1rem;color:var(--rn-carbon);margin-bottom:10px}
.feature-box p{color:var(--rn-titanium);font-size:14px;line-height:1.7}

/* 社区区域 */
.community-area{position:relative;background-size:cover;background-position:center}
.community-overlay{position:absolute;inset:0;background:rgba(15,17,23,.8)}
.comm-card{background:rgba(255,255,255,.1);backdrop-filter:blur(8px);border-radius:10px;padding:24px;border:1px solid rgba(255,255,255,.15);transition:transform .2s}
.comm-card:hover{transform:translateY(-3px)}
.comm-card h4{color:var(--rn-orange);font-size:1rem;margin-bottom:8px}
.comm-card p{color:rgba(255,255,255,.75);font-size:14px;margin-bottom:10px}
.comm-stat{color:var(--rn-titanium);font-size:13px}

/* 专家卡片 */
.expert-card{display:flex;gap:20px;background:var(--rn-white);border-radius:10px;padding:24px;box-shadow:var(--rn-shadow)}
.expert-card img{width:120px;height:120px;border-radius:50%;object-fit:cover;flex-shrink:0}
.expert-info h3{font-size:1.05rem;color:var(--rn-carbon);margin-bottom:8px}
.expert-info p{font-size:14px;color:var(--rn-titanium);margin-bottom:12px;line-height:1.7}
.expert-links{display:flex;gap:12px}
.expert-links a{background:var(--rn-orange);color:var(--rn-white);padding:6px 18px;border-radius:5px;font-size:13px;transition:background .2s}
.expert-links a:hover{background:var(--rn-red)}

/* 品牌墙 */
.brand-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:16px}
.brand-tag{background:var(--rn-white);border:1px solid var(--rn-border);padding:12px 28px;border-radius:8px;font-size:15px;font-weight:600;color:var(--rn-carbon);transition:all .2s}
.brand-tag:hover{border-color:var(--rn-orange);color:var(--rn-orange)}

/* 步骤 */
.steps-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:24px}
.step-box{background:var(--rn-white);border-radius:10px;padding:28px 20px;box-shadow:var(--rn-shadow);text-align:center}
.step-num{display:inline-block;width:48px;height:48px;line-height:48px;background:var(--rn-orange);color:var(--rn-white);border-radius:50%;font-size:18px;font-weight:700;margin-bottom:14px}
.step-box h4{font-size:1rem;color:var(--rn-carbon);margin-bottom:8px}
.step-box p{font-size:14px;color:var(--rn-titanium)}

/* FAQ */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--rn-white);border-radius:8px;margin-bottom:12px;box-shadow:var(--rn-shadow);overflow:hidden}
.faq-item summary{padding:16px 20px;font-weight:600;font-size:15px;color:var(--rn-carbon);cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between}
.faq-item summary::after{content:'+';font-size:20px;color:var(--rn-orange);transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 20px 16px;font-size:14px;color:var(--rn-titanium);line-height:1.7}

/* 评价 */
.review-card{background:var(--rn-white);border-radius:10px;padding:24px;box-shadow:var(--rn-shadow)}
.review-stars{color:#FFB800;font-size:18px;margin-bottom:10px;letter-spacing:2px}
.review-card p{font-size:14px;color:var(--rn-text);line-height:1.7;margin-bottom:12px;font-style:italic}
.review-author{font-size:13px;color:var(--rn-titanium);font-weight:500}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.contact-box{background:var(--rn-white);border-radius:10px;padding:24px;box-shadow:var(--rn-shadow)}
.contact-box h4{font-size:1.05rem;color:var(--rn-carbon);margin-bottom:12px;padding-bottom:8px;border-bottom:2px solid var(--rn-orange)}
.contact-box p{font-size:14px;color:var(--rn-titanium);margin-bottom:6px}
.qr-placeholder{display:flex;gap:16px}
.qr-box{width:120px;height:120px;background:var(--rn-light);border:2px dashed var(--rn-border);border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--rn-titanium)}

/* 分享 */
.share-area{text-align:center;padding:20px 0}
.share-area h3{font-size:1.2rem;color:var(--rn-carbon);margin-bottom:16px}
.share-btns{display:flex;justify-content:center;gap:16px}
.share-link{background:var(--rn-carbon);color:var(--rn-white);padding:10px 24px;border-radius:6px;font-size:14px;transition:background .2s}
.share-link:hover{background:var(--rn-orange);color:var(--rn-white)}

/* 页脚 */
.site-foot{background:var(--rn-carbon);color:var(--rn-titanium);padding:48px 0 0}
.foot-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.1)}
.foot-brand img{height:36px;margin-bottom:12px}
.foot-brand p{font-size:14px;line-height:1.7;color:var(--rn-titanium)}
.foot-links h4{color:var(--rn-orange);font-size:15px;margin-bottom:12px}
.foot-links a{display:block;color:var(--rn-titanium);font-size:14px;margin-bottom:8px;transition:color .2s}
.foot-links a:hover{color:var(--rn-orange)}
.foot-bottom{text-align:center;padding:20px 0;font-size:13px}

/* 回到顶部 */
.back-top{position:fixed;bottom:40px;right:30px;width:44px;height:44px;background:var(--rn-orange);color:var(--rn-white);border:none;border-radius:50%;font-size:18px;cursor:pointer;opacity:0;visibility:hidden;transition:all .3s;box-shadow:0 4px 12px rgba(255,107,44,.3);z-index:99}
.back-top.show{opacity:1;visibility:visible}
.back-top:hover{background:var(--rn-red)}

/* 响应式 */
@media(max-width:1024px){
  .cols-4{grid-template-columns:repeat(2,1fr)}
  .steps-row{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .foot-top{grid-template-columns:1fr}
}
@media(max-width:768px){
  .main-nav{display:none}
  .search-wrap{display:none}
  .mobile-menu{display:block}
  .cols-2,.cols-3{grid-template-columns:1fr}
  .hero-area{min-height:400px}
  .hero-area h1{font-size:1.6rem}
  .hero-content{padding:40px 20px}
  .expert-card{flex-direction:column;align-items:center;text-align:center}
  .tab-bar{flex-wrap:wrap}
}