/* ===== 小小绘汽车改装视频社区 — 原创样式 ===== */
/* 配色：暗黑赛道风 #0d0d0d / #1a1a2e / #ff4d00 / #00d4ff / #ffd700 */

*,*::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:#f0f0f0;line-height:1.7;overflow-x:hidden}
a{color:#00d4ff;text-decoration:none;transition:color .25s}
a:hover{color:#ff4d00}
img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* 顶部导航 */
.topbar{position:sticky;top:0;z-index:1000;background:rgba(13,13,13,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,77,0,.15);padding:0 24px}
.topbar-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;height:68px;gap:20px}
.brand-link{flex-shrink:0}
.brand-logo{height:44px;width:auto}
.main-nav{display:flex;gap:6px;flex:1;justify-content:center}
.nav-item{padding:8px 16px;border-radius:8px;font-size:.9rem;color:#a0a0b0;font-weight:500;transition:all .25s}
.nav-item:hover,.nav-item.active{color:#ff4d00;background:rgba(255,77,0,.08)}
.search-box{display:flex;align-items:center;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:24px;padding:4px 12px;width:220px;transition:border-color .3s}
.search-box:focus-within{border-color:#ff4d00}
.search-box input{background:none;border:none;outline:none;color:#f0f0f0;font-size:.85rem;width:100%;padding:6px 4px}
.search-box input::placeholder{color:#666}
.search-box button{background:none;border:none;color:#a0a0b0;cursor:pointer;padding:4px;display:flex;align-items:center}
.search-box button:hover{color:#ff4d00}
.mobile-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.mobile-toggle span{display:block;width:24px;height:2px;background:#f0f0f0;border-radius:2px;transition:all .3s}

/* Hero区域 */
.hero-section{position:relative;min-height:85vh;display:flex;align-items:center;justify-content:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.45) saturate(1.2)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,13,13,.85) 0%,rgba(26,26,46,.6) 50%,rgba(255,77,0,.1) 100%)}
.hero-content{position:relative;z-index:2;text-align:center;max-width:900px;padding:40px 24px}
.hero-title{font-size:3.2rem;font-weight:800;background:linear-gradient(135deg,#ff4d00,#ffd700);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:20px;line-height:1.3}
.hero-desc{font-size:1.1rem;color:#c0c0d0;margin-bottom:36px;line-height:1.8}
.hero-stats{display:flex;justify-content:center;gap:40px;margin-bottom:36px;flex-wrap:wrap}
.stat-item{text-align:center}
.stat-num{display:block;font-size:2rem;font-weight:800;color:#ff4d00}
.stat-label{font-size:.8rem;color:#888;margin-top:4px}
.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-block;padding:14px 36px;background:linear-gradient(135deg,#ff4d00,#ff7a33);color:#fff;border-radius:12px;font-weight:600;font-size:1rem;transition:transform .25s,box-shadow .25s}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(255,77,0,.35);color:#fff}
.btn-outline{display:inline-block;padding:14px 36px;border:2px solid #00d4ff;color:#00d4ff;border-radius:12px;font-weight:600;font-size:1rem;transition:all .25s}
.btn-outline:hover{background:#00d4ff;color:#0d0d0d}

/* 通用Section */
.section{padding:80px 0}
.section-dark{background:#111122}
.section-header{text-align:center;margin-bottom:52px}
.section-title{font-size:2rem;font-weight:700;color:#f0f0f0;margin-bottom:12px}
.section-subtitle{font-size:1rem;color:#888;max-width:680px;margin:0 auto}

/* 视频卡片网格 */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.video-card{background:#151528;border-radius:16px;overflow:hidden;transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(255,77,0,.15)}
.video-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.06)}
.play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(0,0,0,.3)}
.video-card:hover .play-overlay{opacity: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:.75rem}
.video-info{padding:16px 20px}
.video-title{font-size:.95rem;font-weight:600;color:#e0e0f0;margin-bottom:10px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:.78rem;color:#777;margin-bottom:8px;flex-wrap:wrap}
.video-tags{display:flex;gap:6px;flex-wrap:wrap}
.tag{background:rgba(255,77,0,.12);color:#ff7a33;padding:2px 10px;border-radius:12px;font-size:.72rem}

/* 特性卡片 */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.feature-card{background:#151528;border-radius:16px;overflow:hidden;transition:transform .3s}
.feature-card:hover{transform:translateY(-4px)}
.feature-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.feature-card h3{padding:20px 20px 8px;font-size:1.1rem;color:#ff4d00}
.feature-card p{padding:0 20px 20px;font-size:.9rem;color:#999;line-height:1.7}

/* AI赋能 */
.ai-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-bottom:40px}
.ai-card{background:linear-gradient(145deg,#151528,#1a1a35);border:1px solid rgba(0,212,255,.1);border-radius:16px;padding:32px 24px;text-align:center;transition:border-color .3s,transform .3s}
.ai-card:hover{border-color:#00d4ff;transform:translateY(-4px)}
.ai-icon{font-size:2.5rem;margin-bottom:16px}
.ai-card h3{font-size:1rem;color:#00d4ff;margin-bottom:10px}
.ai-card p{font-size:.85rem;color:#888;line-height:1.7}
.ai-showcase{border-radius:16px;overflow:hidden}
.ai-showcase img{width:100%;border-radius:16px}

/* 社区 */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.community-card{background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);border-radius:14px;padding:28px;transition:border-color .3s}
.community-card:hover{border-color:#ff4d00}
.community-card h4{color:#ffd700;font-size:1rem;margin-bottom:10px}
.community-card p{font-size:.85rem;color:#888;line-height:1.7;margin-bottom:12px}
.card-count{font-size:.78rem;color:#ff4d00;font-weight:600}

/* 专家 */
.expert-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.expert-card{background:#151528;border-radius:16px;overflow:hidden;text-align:center;padding-bottom:20px;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-card img{width:100%;aspect-ratio:4/5;object-fit:cover}
.expert-card h4{padding:16px 12px 4px;font-size:.95rem;color:#f0f0f0}
.expert-title{font-size:.78rem;color:#ff4d00;margin-bottom:8px;padding:0 12px}
.expert-desc{font-size:.78rem;color:#888;padding:0 12px;line-height:1.6;margin-bottom:6px}
.expert-awards{font-size:.72rem;color:#ffd700;padding:0 12px;margin-bottom:12px}
.expert-actions{display:flex;gap:8px;justify-content:center;padding:0 12px}
.btn-sm{padding:6px 14px;background:#ff4d00;color:#fff;border-radius:8px;font-size:.75rem;transition:background .25s}
.btn-sm:hover{background:#ff7a33;color:#fff}
.btn-sm-outline{padding:6px 14px;border:1px solid #00d4ff;color:#00d4ff;border-radius:8px;font-size:.75rem;transition:all .25s}
.btn-sm-outline:hover{background:#00d4ff;color:#0d0d0d}

/* 合作品牌 */
.logo-wall{display:flex;flex-wrap:wrap;gap:20px;justify-content:center}
.partner-logo{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:20px 36px;font-size:1rem;color:#666;font-weight:600;letter-spacing:1px;transition:border-color .3s,color .3s}
.partner-logo:hover{border-color:#ffd700;color:#ffd700}

/* How-To + FAQ 双栏 */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.howto-steps{display:flex;flex-direction:column;gap:24px}
.step{display:flex;gap:16px;align-items:flex-start}
.step-num{flex-shrink:0;width:48px;height:48px;background:linear-gradient(135deg,#ff4d00,#ffd700);border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;color:#0d0d0d}
.step h4{font-size:1rem;color:#f0f0f0;margin-bottom:4px}
.step p{font-size:.85rem;color:#888;line-height:1.6}
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{border:1px solid rgba(255,255,255,.08);border-radius:12px;overflow:hidden}
.faq-question{width:100%;text-align:left;padding:16px 20px;background:rgba(255,255,255,.03);border:none;color:#e0e0f0;font-size:.92rem;cursor:pointer;font-weight:500;transition:background .25s}
.faq-question:hover{background:rgba(255,77,0,.06)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease,padding .35s ease;padding:0 20px}
.faq-answer p{font-size:.85rem;color:#888;line-height:1.7}
.faq-item.active .faq-answer{max-height:300px;padding:12px 20px 16px}
.faq-item.active .faq-question{color:#ff4d00;background:rgba(255,77,0,.08)}

/* 联系我们 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.contact-card{background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);border-radius:16px;padding:32px}
.contact-card h4{color:#ff4d00;font-size:1.1rem;margin-bottom:16px}
.contact-card p{font-size:.88rem;color:#999;margin-bottom:8px;line-height:1.7}
.contact-card strong{color:#c0c0d0}

/* 用户评价 */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);border-radius:14px;padding:28px;transition:border-color .3s}
.review-card:hover{border-color:#ffd700}
.review-stars{color:#ffd700;font-size:1.1rem;margin-bottom:12px}
.review-text{font-size:.88rem;color:#c0c0d0;line-height:1.7;margin-bottom:16px;font-style:italic}
.review-author{display:flex;justify-content:space-between;font-size:.78rem;color:#666}
.review-author strong{color:#a0a0b0}

/* 社交分享 */
.share-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.share-btn{padding:12px 28px;border-radius:12px;font-size:.9rem;font-weight:500;transition:all .25s}
.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-btn:hover{transform:translateY(-2px);opacity:.9;color:#fff}

/* 页脚 */
.site-footer{background:#080818;border-top:1px solid rgba(255,77,0,.1);padding:48px 0 0}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.05)}
.footer-brand img{height:44px;width:auto;margin-bottom:12px}
.footer-brand p{font-size:.85rem;color:#666;line-height:1.7}
.footer-links{display:flex;flex-direction:column;gap:8px}
.footer-links h5{color:#ff4d00;font-size:.9rem;margin-bottom:8px}
.footer-links a{font-size:.82rem;color:#777;transition:color .25s}
.footer-links a:hover{color:#00d4ff}
.footer-qr{display:flex;gap:20px}
.qr-item{text-align:center}
.qr-item img{width:100px;height:100px;border-radius:8px;background:#fff;padding:4px}
.qr-item span{display:block;font-size:.72rem;color:#666;margin-top:6px}
.footer-bottom{text-align:center;padding:20px 0;font-size:.78rem;color:#555}

/* 响应式 */
@media(max-width:1024px){
  .video-grid,.review-grid,.community-grid{grid-template-columns:repeat(2,1fr)}
  .expert-grid{grid-template-columns:repeat(3,1fr)}
  .ai-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .main-nav{display:none;position:absolute;top:68px;left:0;right:0;background:rgba(13,13,13,.97);flex-direction:column;padding:16px;gap:4px}
  .main-nav.open{display:flex}
  .mobile-toggle{display:flex}
  .search-box{width:160px}
  .hero-title{font-size:2rem}
  .hero-stats{gap:20px}
  .stat-num{font-size:1.4rem}
  .video-grid,.review-grid,.community-grid{grid-template-columns:1fr}
  .expert-grid{grid-template-columns:repeat(2,1fr)}
  .ai-grid{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .footer-qr{justify-content:center}
  .section{padding:48px 0}
  .section-title{font-size:1.5rem}
}
@media(max-width:480px){
  .hero-section{min-height:70vh}
  .hero-title{font-size:1.6rem}
  .hero-desc{font-size:.9rem}
  .btn-primary,.btn-outline{padding:12px 24px;font-size:.9rem}
  .expert-grid{grid-template-columns:1fr}
}

/* ===== 子页面专用样式 ===== */
/* 子页面Hero */
.subhero{position:relative;min-height:40vh;display:flex;align-items:center;background-size:cover;background-position:center;overflow:hidden}
.subhero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(13,13,13,.88) 0%,rgba(26,26,46,.7) 50%,rgba(255,77,0,.08) 100%)}
.subhero-content{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:80px 24px 48px}
.subhero-content h1{font-size:2.4rem;font-weight:800;background:linear-gradient(135deg,#ff4d00,#ffd700);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:16px}
.subhero-desc{font-size:1rem;color:#a0a0b0;line-height:1.8;max-width:720px}

/* 面包屑 */
.breadcrumb{margin-bottom:16px;font-size:.82rem}
.breadcrumb a{color:#00d4ff}
.breadcrumb span{color:#888}

/* 双栏布局 */
.page-layout{display:grid;grid-template-columns:1fr 320px;gap:40px}
.page-main{min-width:0}
.page-sidebar{position:sticky;top:80px;align-self:start}

/* 内容块 */
.content-block{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-bottom:40px;background:#151528;border-radius:16px;overflow:hidden;transition:transform .3s}
.content-block:hover{transform:translateY(-3px)}
.content-block:nth-child(even){direction:rtl}
.content-block:nth-child(even) > *{direction:ltr}
.content-text{padding:32px 28px;display:flex;flex-direction:column;justify-content:center}
.content-text h3{font-size:1.15rem;color:#ff4d00;margin-bottom:12px}
.content-text p{font-size:.9rem;color:#999;line-height:1.8}
.content-image img{width:100%;height:100%;object-fit:cover}

/* 侧边栏 */
.sidebar-section{background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.06);border-radius:14px;padding:20px;margin-bottom:20px}
.sidebar-section h4{color:#ff4d00;font-size:.95rem;margin-bottom:14px}
.sidebar-video{margin-bottom:14px;cursor:pointer}
.sidebar-video .video-thumb{position:relative;border-radius:10px;overflow:hidden;aspect-ratio:16/9}
.sidebar-video .video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.sidebar-video:hover .video-thumb img{transform:scale(1.05)}
.sidebar-video .play-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .3s;background:rgba(0,0,0,.3)}
.sidebar-video:hover .play-overlay{opacity:1}
.sidebar-title{display:block;font-size:.8rem;color:#a0a0b0;margin-top:6px}
.tag-cloud{display:flex;flex-wrap:wrap;gap:6px}
.tag-cloud .tag{background:rgba(255,77,0,.1);color:#ff7a33;padding:4px 12px;border-radius:12px;font-size:.75rem}

/* 子页面响应式 */
@media(max-width:1024px){
  .page-layout{grid-template-columns:1fr}
  .page-sidebar{position:static}
  .content-block{grid-template-columns:1fr}
  .content-block:nth-child(even){direction:ltr}
}
@media(max-width:768px){
  .subhero-content h1{font-size:1.6rem}
  .subhero{min-height:30vh}
}


/* === 娱乐专区短视频 === */
.shorts-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.short-card{border-radius:12px;overflow:hidden;cursor:pointer;transition:transform .3s}
.short-card:hover{transform:translateY(-6px)}
.short-thumb{position:relative;padding-bottom:177%;background-size:cover;background-position:center;border-radius:12px}
.short-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);opacity:0;transition:opacity .3s}
.short-card:hover .short-play{opacity:1}
.short-duration{position:absolute;top:10px;right:10px;background:rgba(0,0,0,.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:12px}
.short-info{position:absolute;bottom:0;left:0;right:0;padding:16px 12px;background:linear-gradient(transparent,rgba(0,0,0,.85))}
.short-info h5{color:#fff;font-size:14px;margin:0 0 4px}
.short-info span{color:rgba(255,255,255,.7);font-size:12px}

/* === 作者信息模块 === */
.author-info{background:rgba(255,77,0,.05);border-left:4px solid #ff4d00;margin-top:24px}
.author-card p{margin:6px 0;font-size:14px;line-height:1.8;color:#b0b0b0}
.author-card strong{color:#ff4d00}

/* === 子页面FAQ === */
.sub-faq{margin-top:24px}
.sub-faq .faq-list{margin-top:12px}
.sub-faq .faq-item{border-bottom:1px solid rgba(255,255,255,.08);padding:10px 0}
.sub-faq .faq-question{background:none;border:none;color:#e0e0e0;font-size:15px;cursor:pointer;width:100%;text-align:left;padding:8px 0}
.sub-faq .faq-question:hover{color:#ff4d00}
.sub-faq .faq-answer{display:none;padding:8px 0;color:#999;font-size:14px;line-height:1.7}
.sub-faq .faq-item.active .faq-answer{display:block}

@media(max-width:1024px){
  .shorts-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:640px){
  .shorts-grid{grid-template-columns:repeat(2,1fr)}
  .short-thumb{padding-bottom:150%}
}