/* ============================================
   91修车改装 - 原创样式表
   配色：赛车红(#E63946) + 深海蓝(#1D3557) + 钢铁灰(#457B9D)
   字体：系统中文字体栈
   ============================================ */

/* === 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","Hiragino Sans GB","Microsoft YaHei","WenQuanYi Micro Hei",sans-serif;color:#2b2d42;background:#f8f9fa;line-height:1.7}
a{text-decoration:none;color:inherit;transition:color .3s}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}

/* === 布局容器 === */
.gt-wrap{max-width:1280px;margin:0 auto;padding:0 24px}
.gt-row{display:flex;flex-wrap:wrap;gap:24px}

/* === 顶部导航 === */
.gt-topbar{background:linear-gradient(135deg,#1D3557 0%,#0d1b2a 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 12px rgba(0,0,0,.3)}
.gt-topbar .gt-wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.gt-logo{display:flex;align-items:center;gap:10px}
.gt-logo img{height:42px;width:auto;border-radius:6px}
.gt-logo-text{font-size:1.5rem;font-weight:800;color:#fff;letter-spacing:1px}
.gt-logo-text span{color:#E63946}
.gt-nav{display:flex;gap:6px}
.gt-nav a{color:#a8dadc;font-size:.9rem;padding:8px 14px;border-radius:6px;transition:all .3s;font-weight:500}
.gt-nav a:hover,.gt-nav a.active{color:#fff;background:rgba(230,57,70,.2)}
.gt-search-box{display:flex;align-items:center;background:rgba(255,255,255,.1);border-radius:20px;padding:4px 12px;border:1px solid rgba(255,255,255,.15)}
.gt-search-box input{background:none;border:none;color:#fff;outline:none;width:140px;font-size:.85rem;padding:4px 6px}
.gt-search-box input::placeholder{color:rgba(255,255,255,.5)}
.gt-search-box button{background:none;border:none;color:#E63946;cursor:pointer;font-size:1rem;padding:4px}
.gt-mobile-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}

/* === Hero Banner === */
.gt-hero{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden;background:#1D3557}
.gt-hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.45)}
.gt-hero-content{position:relative;z-index:2;max-width:680px;padding:60px 0;margin-left:8%}
.gt-hero h1{font-size:2.8rem;font-weight:900;color:#fff;line-height:1.3;margin-bottom:16px;text-shadow:0 2px 8px rgba(0,0,0,.5)}
.gt-hero h1 span{color:#E63946}
.gt-hero-desc{font-size:1.1rem;color:#a8dadc;line-height:1.8;margin-bottom:28px}
.gt-hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:28px}
.gt-hero-tags span{background:rgba(230,57,70,.25);color:#fff;padding:5px 14px;border-radius:16px;font-size:.82rem;border:1px solid rgba(230,57,70,.4)}
.gt-hero-btns{display:flex;gap:14px}
.gt-btn-primary{background:linear-gradient(135deg,#E63946,#c1121f);color:#fff;padding:12px 32px;border-radius:8px;font-weight:700;font-size:1rem;border:none;cursor:pointer;transition:all .3s;display:inline-flex;align-items:center;gap:8px}
.gt-btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(230,57,70,.4)}
.gt-btn-outline{border:2px solid #457B9D;color:#a8dadc;padding:10px 28px;border-radius:8px;font-weight:600;font-size:1rem;cursor:pointer;transition:all .3s;background:transparent;display:inline-flex;align-items:center;gap:8px}
.gt-btn-outline:hover{background:#457B9D;color:#fff}

/* === 通用区块标题 === */
.gt-section{padding:64px 0}
.gt-section:nth-child(even){background:#fff}
.gt-section-head{text-align:center;margin-bottom:48px}
.gt-section-head h2{font-size:2rem;font-weight:800;color:#1D3557;margin-bottom:10px;position:relative;display:inline-block}
.gt-section-head h2::after{content:'';display:block;width:60px;height:4px;background:linear-gradient(90deg,#E63946,#457B9D);margin:10px auto 0;border-radius:2px}
.gt-section-head p{color:#6c757d;font-size:1rem;max-width:600px;margin:0 auto}
.gt-section-head h3{font-size:1.2rem;color:#457B9D;font-weight:600;margin-bottom:6px}

/* === 视频卡片网格 === */
.gt-grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.gt-grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.gt-grid-5{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}

.gt-vcard{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 16px rgba(0,0,0,.08);transition:all .35s;position:relative}
.gt-vcard:hover{transform:translateY(-6px);box-shadow:0 12px 32px rgba(0,0,0,.15)}
.gt-vcard-thumb{position:relative;overflow:hidden;aspect-ratio:16/9}
.gt-vcard-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.gt-vcard:hover .gt-vcard-thumb img{transform:scale(1.08)}
.gt-vcard-play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.35);opacity:0;transition:opacity .3s}
.gt-vcard:hover .gt-vcard-play{opacity:1}
.gt-vcard-play i{width:56px;height:56px;background:rgba(230,57,70,.9);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .3s}
.gt-vcard-play i::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:4px}
.gt-vcard:hover .gt-vcard-play i{transform:scale(1.15)}
.gt-vcard-info{padding:14px 16px}
.gt-vcard-info h4{font-size:.95rem;font-weight:700;color:#1D3557;margin-bottom:6px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.gt-vcard-info p{font-size:.8rem;color:#6c757d;line-height:1.5}
.gt-vcard-meta{display:flex;justify-content:space-between;align-items:center;padding:0 16px 12px;font-size:.75rem;color:#999}
.gt-vcard-tag{background:#edf2f4;color:#457B9D;padding:2px 10px;border-radius:10px;font-size:.72rem;font-weight:600}
.gt-vcard-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.7);color:#fff;padding:2px 8px;border-radius:4px;font-size:.72rem;z-index:3}

/* === 专家团队 === */
.gt-expert-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:24px}
.gt-expert-card{text-align:center;background:#fff;border-radius:12px;padding:28px 16px;box-shadow:0 4px 16px rgba(0,0,0,.06);transition:all .3s}
.gt-expert-card:hover{transform:translateY(-4px);box-shadow:0 8px 28px rgba(0,0,0,.12)}
.gt-expert-card img{width:100px;height:100px;border-radius:50%;object-fit:cover;margin:0 auto 14px;border:3px solid #E63946}
.gt-expert-card h4{font-size:1rem;font-weight:700;color:#1D3557;margin-bottom:4px}
.gt-expert-card .gt-expert-role{color:#E63946;font-size:.82rem;font-weight:600;margin-bottom:8px}
.gt-expert-card p{font-size:.8rem;color:#6c757d;line-height:1.6}

/* === FAQ 手风琴 === */
.gt-faq-list{max-width:800px;margin:0 auto}
.gt-faq-item{background:#fff;border-radius:10px;margin-bottom:12px;box-shadow:0 2px 8px rgba(0,0,0,.05);overflow:hidden}
.gt-faq-q{padding:18px 24px;font-weight:700;color:#1D3557;cursor:pointer;display:flex;justify-content:space-between;align-items:center;transition:background .3s;font-size:.95rem}
.gt-faq-q:hover{background:#f1faee}
.gt-faq-q::after{content:'+';font-size:1.4rem;color:#E63946;transition:transform .3s;font-weight:400}
.gt-faq-item.active .gt-faq-q::after{transform:rotate(45deg)}
.gt-faq-a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 24px}
.gt-faq-item.active .gt-faq-a{max-height:300px;padding:0 24px 18px}
.gt-faq-a p{color:#6c757d;font-size:.9rem;line-height:1.8}

/* === 用户评价 === */
.gt-review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.gt-review-card{background:#fff;border-radius:12px;padding:24px;box-shadow:0 4px 14px rgba(0,0,0,.06);border-left:4px solid #E63946}
.gt-review-card .gt-stars{color:#f4a261;font-size:.9rem;margin-bottom:8px;letter-spacing:2px}
.gt-review-card blockquote{font-size:.9rem;color:#495057;line-height:1.8;margin-bottom:12px;font-style:italic}
.gt-review-card .gt-reviewer{font-size:.82rem;color:#999;font-weight:600}

/* === 数据统计条 === */
.gt-stats{background:linear-gradient(135deg,#1D3557,#0d1b2a);padding:48px 0}
.gt-stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.gt-stat-item h3{font-size:2.4rem;font-weight:900;color:#E63946;margin-bottom:6px}
.gt-stat-item p{color:#a8dadc;font-size:.9rem}

/* === 社区互动区 === */
.gt-community-box{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.gt-community-box img{border-radius:12px;box-shadow:0 8px 24px rgba(0,0,0,.12)}
.gt-community-text h3{font-size:1.5rem;font-weight:800;color:#1D3557;margin-bottom:14px}
.gt-community-text p{color:#6c757d;line-height:1.8;margin-bottom:16px;font-size:.95rem}
.gt-community-features{display:flex;flex-wrap:wrap;gap:10px}
.gt-community-features span{background:#edf2f4;color:#1D3557;padding:6px 16px;border-radius:20px;font-size:.82rem;font-weight:600}

/* === AI赋能区 === */
.gt-ai-box{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center}
.gt-ai-box img{border-radius:12px;box-shadow:0 8px 24px rgba(0,0,0,.12)}
.gt-ai-text h3{font-size:1.5rem;font-weight:800;color:#1D3557;margin-bottom:14px}
.gt-ai-text p{color:#6c757d;line-height:1.8;margin-bottom:16px;font-size:.95rem}
.gt-ai-features{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.gt-ai-feat{background:#f1faee;padding:14px;border-radius:8px;text-align:center}
.gt-ai-feat h5{font-size:.88rem;font-weight:700;color:#1D3557;margin-bottom:4px}
.gt-ai-feat p{font-size:.78rem;color:#6c757d}

/* === 页脚 === */
.gt-footer{background:#0d1b2a;color:#a8dadc;padding:48px 0 0}
.gt-footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.gt-footer h4{color:#fff;font-size:1rem;font-weight:700;margin-bottom:16px;position:relative;padding-bottom:10px}
.gt-footer h4::after{content:'';position:absolute;bottom:0;left:0;width:30px;height:3px;background:#E63946;border-radius:2px}
.gt-footer p{font-size:.85rem;line-height:1.8;color:#6c8ea1}
.gt-footer a{color:#6c8ea1;font-size:.85rem;display:block;padding:4px 0;transition:color .3s}
.gt-footer a:hover{color:#E63946}
.gt-footer-qr{display:flex;gap:16px}
.gt-footer-qr img{width:100px;border-radius:8px}
.gt-footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:20px 0;text-align:center;font-size:.8rem;color:#4a6a7d}

/* === 面包屑 === */
.gt-breadcrumb{padding:16px 0;font-size:.85rem;color:#6c757d}
.gt-breadcrumb a{color:#457B9D}
.gt-breadcrumb a:hover{color:#E63946}
.gt-breadcrumb span{margin:0 8px;color:#ccc}

/* === 内页头部 === */
.gt-page-hero{position:relative;min-height:280px;display:flex;align-items:center;overflow:hidden;background:#1D3557}
.gt-page-hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.35)}
.gt-page-hero-content{position:relative;z-index:2;text-align:center;width:100%}
.gt-page-hero h1{font-size:2.2rem;font-weight:900;color:#fff;margin-bottom:10px}
.gt-page-hero p{color:#a8dadc;font-size:1rem}

/* === 内页内容 === */
.gt-page-content{padding:48px 0}
.gt-page-content h2{font-size:1.6rem;font-weight:800;color:#1D3557;margin:32px 0 16px}
.gt-page-content h3{font-size:1.3rem;font-weight:700;color:#457B9D;margin:24px 0 12px}
.gt-page-content p{color:#495057;line-height:1.9;margin-bottom:16px;font-size:.95rem}
.gt-page-content ul{margin:12px 0 20px 20px}
.gt-page-content ul li{color:#495057;line-height:1.9;font-size:.92rem;position:relative;padding-left:16px;margin-bottom:6px}
.gt-page-content ul li::before{content:'';position:absolute;left:0;top:10px;width:6px;height:6px;background:#E63946;border-radius:50%}

/* === 标签云 === */
.gt-tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0}
.gt-tag-cloud a{background:#edf2f4;color:#1D3557;padding:6px 16px;border-radius:20px;font-size:.82rem;font-weight:600;transition:all .3s}
.gt-tag-cloud a:hover{background:#E63946;color:#fff}

/* === 分页 === */
.gt-pagination{display:flex;justify-content:center;gap:8px;margin-top:40px}
.gt-pagination a{width:38px;height:38px;display:flex;align-items:center;justify-content:center;border-radius:8px;background:#edf2f4;color:#1D3557;font-size:.88rem;font-weight:600;transition:all .3s}
.gt-pagination a:hover,.gt-pagination a.active{background:#E63946;color:#fff}

/* === 响应式 === */
@media(max-width:1024px){
    .gt-grid-3{grid-template-columns:repeat(2,1fr)}
    .gt-grid-4{grid-template-columns:repeat(2,1fr)}
    .gt-expert-grid{grid-template-columns:repeat(3,1fr)}
    .gt-footer-grid{grid-template-columns:repeat(2,1fr)}
    .gt-community-box,.gt-ai-box{grid-template-columns:1fr}
    .gt-stats-row{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
    .gt-topbar .gt-wrap{flex-wrap:wrap;height:auto;padding:12px 16px}
    .gt-nav{display:none;width:100%;flex-direction:column;gap:0;padding:12px 0}
    .gt-nav.active{display:flex}
    .gt-nav a{padding:10px 0;border-bottom:1px solid rgba(255,255,255,.06)}
    .gt-mobile-toggle{display:block}
    .gt-search-box{width:100%;margin-top:8px;order:3}
    .gt-search-box input{width:100%}
    .gt-hero{min-height:400px}
    .gt-hero-content{margin-left:0;padding:40px 20px}
    .gt-hero h1{font-size:1.8rem}
    .gt-hero-btns{flex-direction:column;gap:10px}
    .gt-grid-3,.gt-grid-4,.gt-grid-5{grid-template-columns:1fr}
    .gt-expert-grid{grid-template-columns:repeat(2,1fr)}
    .gt-review-grid{grid-template-columns:1fr}
    .gt-section{padding:40px 0}
    .gt-section-head h2{font-size:1.5rem}
    .gt-footer-grid{grid-template-columns:1fr}
    .gt-page-hero{min-height:200px}
    .gt-page-hero h1{font-size:1.6rem}
}
@media(max-width:480px){
    .gt-expert-grid{grid-template-columns:1fr}
    .gt-stats-row{grid-template-columns:1fr}
    .gt-hero h1{font-size:1.5rem}
    .gt-ai-features{grid-template-columns:1fr}
}