/* ============================================
   丝瓜视频 - 汽车改装与视频社区 原创样式
   品牌色：香槟金 #C9A96E / 午夜黑 #0D0D0D / 银灰 #8A8A8A
   ============================================ */
:root {
    --gold: #C9A96E;
    --gold-light: #E8D5A8;
    --gold-dark: #9B7D3C;
    --black: #0D0D0D;
    --black-light: #1A1A1A;
    --black-card: #141414;
    --silver: #8A8A8A;
    --silver-light: #B0B0B0;
    --white: #F5F0E8;
    --bg-dark: #0A0A0A;
    --bg-section: #111111;
    --text-main: #E8E0D0;
    --text-muted: #7A7060;
    --danger: #C0392B;
    --success: #27AE60;
    --radius: 10px;
    --shadow: 0 4px 24px rgba(201,169,110,0.08);
    --shadow-hover: 0 8px 40px rgba(201,169,110,0.18);
    --transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
}
*,*::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:var(--bg-dark);color:var(--text-main);line-height:1.75;overflow-x:hidden}
a{color:var(--gold);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--gold-light)}
img{max-width:100%;height:auto;display:block}
.container{max-width:1240px;margin:0 auto;padding:0 20px}

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

/* ========== 顶部导航 ========== */
.site-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(10,10,10,0.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(201,169,110,0.12);transition:var(--transition)}
.site-header.scrolled{background:rgba(10,10,10,0.98);box-shadow:0 2px 20px rgba(0,0,0,0.5)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px;max-width:1240px;margin:0 auto;padding:0 20px}
.logo-area{display:flex;align-items:center;gap:10px}
.logo-area img{height:42px;width:auto}
.logo-area .brand-text{font-size:1.3rem;font-weight:700;color:var(--gold);letter-spacing:1px}
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{display:block;padding:8px 16px;font-size:0.92rem;color:var(--text-main);border-radius:6px;transition:var(--transition);white-space:nowrap}
.main-nav a:hover,.main-nav a.active{color:var(--gold);background:rgba(201,169,110,0.08)}
.mobile-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.mobile-toggle span{display:block;width:24px;height:2px;background:var(--gold);transition:var(--transition)}

/* 搜索框 */
.search-bar{background:var(--black-light);border-bottom:1px solid rgba(201,169,110,0.08);padding:12px 0;margin-top:68px}
.search-bar .container{display:flex;align-items:center;gap:12px}
.search-input-wrap{flex:1;position:relative}
.search-input-wrap input{width:100%;padding:10px 44px 10px 18px;background:var(--black-card);border:1px solid rgba(201,169,110,0.15);border-radius:24px;color:var(--text-main);font-size:0.9rem;outline:none;transition:var(--transition)}
.search-input-wrap input:focus{border-color:var(--gold);box-shadow:0 0 0 3px rgba(201,169,110,0.1)}
.search-input-wrap input::placeholder{color:var(--text-muted)}
.search-btn{position:absolute;right:4px;top:50%;transform:translateY(-50%);background:var(--gold);color:var(--black);border:none;padding:7px 18px;border-radius:20px;cursor:pointer;font-size:0.85rem;font-weight:600;transition:var(--transition)}
.search-btn:hover{background:var(--gold-light)}

/* 面包屑 */
.breadcrumb{padding:14px 0;font-size:0.82rem;color:var(--text-muted)}
.breadcrumb a{color:var(--silver)}
.breadcrumb a:hover{color:var(--gold)}
.breadcrumb span{margin:0 6px;color:var(--text-muted)}

/* ========== Banner ========== */
.hero-banner{position:relative;width:100%;min-height:520px;display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--black)}
.hero-banner .bg-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0.55;filter:brightness(0.6)}
.hero-content{position:relative;z-index:2;text-align:center;padding:60px 20px;max-width:800px}
.hero-content h1{font-size:2.8rem;font-weight:800;color:var(--gold);margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,0.6);line-height:1.3}
.hero-content h2{font-size:1.2rem;font-weight:400;color:var(--white);margin-bottom:28px;text-shadow:0 1px 10px rgba(0,0,0,0.5)}
.hero-content .hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:24px}
.hero-content .hero-tags span{padding:5px 16px;background:rgba(201,169,110,0.15);border:1px solid rgba(201,169,110,0.3);border-radius:20px;font-size:0.82rem;color:var(--gold-light)}
.hero-btn{display:inline-block;padding:14px 40px;background:linear-gradient(135deg,var(--gold),var(--gold-dark));color:var(--black);font-size:1rem;font-weight:700;border-radius:30px;transition:var(--transition);box-shadow:0 4px 20px rgba(201,169,110,0.3)}
.hero-btn:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(201,169,110,0.4);color:var(--black)}

/* ========== 通用区块 ========== */
.section{padding:60px 0}
.section-alt{background:var(--bg-section)}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:1.9rem;font-weight:700;color:var(--gold);margin-bottom:8px}
.section-title h3{font-size:1rem;color:var(--text-muted);font-weight:400}
.section-title .divider{width:60px;height:3px;background:linear-gradient(90deg,var(--gold),var(--gold-dark));margin:12px auto 0;border-radius:2px}

/* 统计条 */
.stats-bar{background:linear-gradient(135deg,var(--black-light),var(--black-card));padding:40px 0;border-top:1px solid rgba(201,169,110,0.08);border-bottom:1px solid rgba(201,169,110,0.08)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-item .stat-num{font-size:2.2rem;font-weight:800;color:var(--gold);font-family:'Georgia',serif}
.stat-item .stat-label{font-size:0.85rem;color:var(--text-muted);margin-top:4px}

/* ========== 视频卡片 ========== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.video-card{background:var(--black-card);border-radius:var(--radius);overflow:hidden;border:1px solid rgba(201,169,110,0.06);transition:var(--transition);cursor:pointer}
.video-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(201,169,110,0.2)}
.video-thumb{position:relative;width:100%;padding-top:56.25%;overflow:hidden;background:var(--black)}
.video-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:var(--transition)}
.video-card:hover .video-thumb img{transform:scale(1.05);filter:brightness(0.7)}
.video-play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) scale(0.8);width:56px;height:56px;background:rgba(201,169,110,0.9);border-radius:50%;display:flex;align-items:center;justify-content:center;opacity:0;transition:var(--transition);box-shadow:0 4px 20px rgba(0,0,0,0.4)}
.video-play-btn::after{content:'';width:0;height:0;border-style:solid;border-width:10px 0 10px 18px;border-color:transparent transparent transparent var(--black);margin-left:3px}
.video-card:hover .video-play-btn{opacity:1;transform:translate(-50%,-50%) scale(1)}
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,0.8);color:var(--white);padding:2px 8px;border-radius:4px;font-size:0.75rem;font-weight:600}
.video-info{padding:14px 16px}
.video-info h3{font-size:0.95rem;font-weight:600;color:var(--text-main);margin-bottom:8px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;align-items:center;gap:14px;font-size:0.78rem;color:var(--text-muted);margin-bottom:8px}
.video-tags{display:flex;flex-wrap:wrap;gap:6px}
.video-tags span{padding:2px 10px;background:rgba(201,169,110,0.1);border:1px solid rgba(201,169,110,0.15);border-radius:12px;font-size:0.72rem;color:var(--gold)}

/* ========== 分类卡片 ========== */
.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.cat-card{position:relative;border-radius:var(--radius);overflow:hidden;min-height:200px;display:flex;align-items:flex-end;transition:var(--transition);border:1px solid rgba(201,169,110,0.06)}
.cat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.cat-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:var(--transition)}
.cat-card:hover img{transform:scale(1.05)}
.cat-card .cat-overlay{position:relative;z-index:2;width:100%;padding:20px;background:linear-gradient(transparent,rgba(0,0,0,0.85))}
.cat-card h3{font-size:1.05rem;color:var(--gold-light);font-weight:600;margin-bottom:4px}
.cat-card p{font-size:0.8rem;color:var(--silver-light)}

/* ========== 专家卡片 ========== */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.expert-card{background:var(--black-card);border-radius:var(--radius);padding:28px 20px;text-align:center;border:1px solid rgba(201,169,110,0.06);transition:var(--transition)}
.expert-card:hover{border-color:rgba(201,169,110,0.25);box-shadow:var(--shadow-hover)}
.expert-card .avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 14px;overflow:hidden;border:3px solid var(--gold);box-shadow:0 4px 16px rgba(201,169,110,0.2)}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:1.05rem;color:var(--gold);margin-bottom:4px}
.expert-card .role{font-size:0.82rem;color:var(--text-muted);margin-bottom:10px}
.expert-card .desc{font-size:0.82rem;color:var(--silver);line-height:1.6;margin-bottom:14px}
.expert-card .expert-btns{display:flex;gap:8px;justify-content:center}
.btn-sm{padding:6px 16px;border-radius:18px;font-size:0.78rem;font-weight:600;transition:var(--transition);cursor:pointer;border:none}
.btn-gold{background:var(--gold);color:var(--black)}
.btn-gold:hover{background:var(--gold-light);color:var(--black)}
.btn-outline{background:transparent;color:var(--gold);border:1px solid var(--gold)}
.btn-outline:hover{background:var(--gold);color:var(--black)}

/* ========== FAQ ========== */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:var(--black-card);border:1px solid rgba(201,169,110,0.06);border-radius:var(--radius);margin-bottom:12px;overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:rgba(201,169,110,0.2)}
.faq-q{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:var(--text-main);font-size:0.95rem}
.faq-q::after{content:'+';font-size:1.3rem;color:var(--gold);transition:var(--transition);font-weight:300}
.faq-item.active .faq-q::after{content:'-';transform:rotate(180deg)}
.faq-a{padding:0 20px;max-height:0;overflow:hidden;transition:max-height 0.4s ease,padding 0.4s ease;font-size:0.88rem;color:var(--silver-light);line-height:1.7}
.faq-item.active .faq-a{max-height:300px;padding:0 20px 16px}

/* ========== 用户评价 ========== */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.review-card{background:var(--black-card);border-radius:var(--radius);padding:24px;border:1px solid rgba(201,169,110,0.06);transition:var(--transition)}
.review-card:hover{border-color:rgba(201,169,110,0.2)}
.review-stars{color:var(--gold);font-size:0.9rem;margin-bottom:10px;letter-spacing:2px}
.review-text{font-size:0.88rem;color:var(--silver-light);line-height:1.7;margin-bottom:12px;font-style:italic}
.review-author{display:flex;align-items:center;gap:10px}
.review-author .r-avatar{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--gold),var(--gold-dark));display:flex;align-items:center;justify-content:center;color:var(--black);font-weight:700;font-size:0.85rem}
.review-author .r-info .r-name{font-size:0.85rem;color:var(--text-main);font-weight:600}
.review-author .r-info .r-date{font-size:0.75rem;color:var(--text-muted)}

/* ========== 合作品牌 ========== */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center;padding:20px 0}
.partner-wall .partner-item{padding:12px 24px;background:var(--black-card);border:1px solid rgba(201,169,110,0.08);border-radius:8px;font-size:0.9rem;color:var(--silver);font-weight:600;transition:var(--transition)}
.partner-wall .partner-item:hover{border-color:var(--gold);color:var(--gold)}

/* ========== How-To ========== */
.howto-steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px;max-width:1000px;margin:0 auto}
.howto-step{background:var(--black-card);border-radius:var(--radius);padding:24px;text-align:center;border:1px solid rgba(201,169,110,0.06);transition:var(--transition)}
.howto-step:hover{border-color:rgba(201,169,110,0.2)}
.howto-step .step-num{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--gold),var(--gold-dark));color:var(--black);display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:800;margin:0 auto 12px}
.howto-step h4{font-size:0.95rem;color:var(--gold-light);margin-bottom:6px}
.howto-step p{font-size:0.82rem;color:var(--silver)}

/* ========== 联系我们 ========== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.contact-box{background:var(--black-card);border-radius:var(--radius);padding:28px;border:1px solid rgba(201,169,110,0.06)}
.contact-box h4{font-size:1.05rem;color:var(--gold);margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid rgba(201,169,110,0.1)}
.contact-box .info-row{display:flex;align-items:flex-start;gap:10px;margin-bottom:10px;font-size:0.88rem;color:var(--silver-light)}
.contact-box .info-row .label{color:var(--text-muted);min-width:70px;flex-shrink:0}
.qrcode-area{display:flex;gap:24px;justify-content:center;flex-wrap:wrap;margin-top:16px}
.qrcode-item{text-align:center}
.qrcode-item img{width:120px;height:120px;border-radius:8px;border:2px solid rgba(201,169,110,0.15)}
.qrcode-item p{font-size:0.78rem;color:var(--text-muted);margin-top:6px}

/* ========== 社交分享 ========== */
.share-bar{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;padding:20px 0}
.share-btn{padding:8px 20px;border-radius:20px;font-size:0.82rem;font-weight:600;transition:var(--transition);cursor:pointer;border:1px solid rgba(201,169,110,0.2);color:var(--gold);background:transparent}
.share-btn:hover{background:var(--gold);color:var(--black);border-color:var(--gold)}

/* ========== 页脚 ========== */
.site-footer{background:var(--black);border-top:1px solid rgba(201,169,110,0.1);padding:40px 0 20px}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-col h4{font-size:0.95rem;color:var(--gold);margin-bottom:14px}
.footer-col p,.footer-col a{font-size:0.82rem;color:var(--silver);display:block;margin-bottom:6px;line-height:1.6}
.footer-col a:hover{color:var(--gold)}
.footer-col .footer-logo{height:36px;margin-bottom:10px}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(201,169,110,0.06);font-size:0.78rem;color:var(--text-muted)}

/* ========== 内页通用 ========== */
.page-hero{padding:100px 0 40px;background:linear-gradient(135deg,var(--black),var(--black-light));text-align:center}
.page-hero h1{font-size:2rem;color:var(--gold);margin-bottom:8px}
.page-hero p{font-size:0.95rem;color:var(--silver)}
.page-content{padding:40px 0 60px}

/* ========== 响应式 ========== */
@media(max-width:992px){
    .footer-top{grid-template-columns:1fr 1fr}
    .stats-grid{grid-template-columns:repeat(2,1fr)}
    .hero-content h1{font-size:2rem}
}
@media(max-width:768px){
    .main-nav{display:none;position:absolute;top:68px;left:0;width:100%;background:rgba(10,10,10,0.98);flex-direction:column;padding:16px 0;border-top:1px solid rgba(201,169,110,0.1)}
    .main-nav.open{display:flex}
    .main-nav a{padding:12px 24px}
    .mobile-toggle{display:flex}
    .hero-content h1{font-size:1.6rem}
    .hero-banner{min-height:380px}
    .video-grid{grid-template-columns:1fr}
    .category-grid{grid-template-columns:1fr}
    .expert-grid{grid-template-columns:1fr}
    .review-grid{grid-template-columns:1fr}
    .footer-top{grid-template-columns:1fr}
    .contact-grid{grid-template-columns:1fr}
    .stats-grid{grid-template-columns:1fr}
    .header-inner{padding:0 16px}
}
@media(max-width:480px){
    .hero-content h1{font-size:1.3rem}
    .section{padding:40px 0}
    .section-title h2{font-size:1.4rem}
}