/* 三年二班 - vr697.cn 全新原创样式 宝马蓝色主题 */
*{margin:0;padding:0;box-sizing:border-box}
:root{--bmw-blue:#0066B1;--bmw-dark:#1a1a2e;--bmw-red:#E2001A;--bmw-light:#e8f0fe;--bmw-accent:#00a8e8;--bmw-gray:#2d2d44;--text-main:#f0f0f0;--text-sub:#b0b8c8;--card-bg:#16213e;--radius:12px;--shadow:0 8px 32px rgba(0,102,177,0.15)}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bmw-dark);color:var(--text-main);line-height:1.8;overflow-x:hidden}
a{color:var(--bmw-accent);text-decoration:none;transition:color .3s}
a:hover{color:var(--bmw-blue)}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1280px;margin:0 auto;padding:0 20px}

/* 顶部导航 */
.bo7p8m{background:linear-gradient(135deg,#0d1b2a 0%,#1b2838 100%);border-bottom:2px solid var(--bmw-blue);position:sticky;top:0;z-index:999;backdrop-filter:blur(12px)}
.bo7p8m .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.site-logo{display:flex;align-items:center;gap:10px}
.site-logo img{height:42px;width:auto}
.site-logo span{font-size:22px;font-weight:700;color:#fff;letter-spacing:1px}
.main-nav{display:flex;gap:6px}
.main-nav a{padding:8px 16px;border-radius:6px;font-size:14px;color:#ccd6e0;font-weight:500;transition:all .3s}
.main-nav a:hover,.main-nav a.cur{background:var(--bmw-blue);color:#fff}
.mob-toggle{display:none;font-size:26px;color:#fff;cursor:pointer;background:none;border:none}

/* 搜索栏 */
.nvhsldy{background:var(--bmw-gray);padding:12px 0;border-bottom:1px solid rgba(255,255,255,.06)}
.nvhsldy form{display:flex;max-width:600px;margin:0 auto}
.nvhsldy input{flex:1;padding:10px 18px;border:2px solid var(--bmw-blue);border-right:none;border-radius:8px 0 0 8px;background:rgba(255,255,255,.05);color:#fff;font-size:15px;outline:none}
.nvhsldy input::placeholder{color:#7a8899}
.nvhsldy button{padding:10px 28px;background:var(--bmw-blue);color:#fff;border:2px solid var(--bmw-blue);border-radius:0 8px 8px 0;cursor:pointer;font-size:15px;font-weight:600;transition:background .3s}
.nvhsldy button:hover{background:#004d8a}

/* 横幅区 */
.mid7nmmj{position:relative;height:520px;overflow:hidden}
.mid7nmmj img{width:100%;height:100%;object-fit:cover}
.scdd2wtb{position:absolute;inset:0;background:linear-gradient(180deg,rgba(13,27,42,.4) 0%,rgba(13,27,42,.85) 100%);display:flex;align-items:center;justify-content:center;text-align:center;padding:20px}
.scdd2wtb h1{font-size:42px;font-weight:800;margin-bottom:12px;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.scdd2wtb h1 em{font-style:normal;color:var(--bmw-accent)}
.scdd2wtb p{font-size:18px;color:var(--text-sub);max-width:700px;margin:0 auto 20px}
.scdd2wtb .fdxco{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.scdd2wtb .fdxco span{background:rgba(0,102,177,.3);border:1px solid var(--bmw-blue);padding:5px 16px;border-radius:20px;font-size:13px;color:var(--bmw-accent)}

/* 数据条 */
.vo3ute{background:linear-gradient(90deg,var(--bmw-blue),#004d8a);padding:18px 0}
.vo3ute .wrap{display:flex;justify-content:space-around;text-align:center;flex-wrap:wrap;gap:10px}
.vo3ute .kuh62 h3{font-size:30px;font-weight:800;color:#fff}
.vo3ute .kuh62 p{font-size:13px;color:rgba(255,255,255,.75)}

/* 通用模块标题 */
.vg07di{text-align:center;padding:50px 0 30px}
.vg07di h2{font-size:30px;font-weight:700;position:relative;display:inline-block;padding-bottom:12px}
.vg07di h2::after{content:"";position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:60px;height:3px;background:linear-gradient(90deg,var(--bmw-blue),var(--bmw-red))}
.vg07di p{color:var(--text-sub);margin-top:10px;font-size:15px}

/* 视频卡片网格 */
.vid-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:22px;padding-bottom:40px}
.vid-card{background:var(--card-bg);border-radius:var(--radius);overflow:hidden;transition:transform .35s,box-shadow .35s;cursor:pointer;border:1px solid rgba(255,255,255,.04)}
.vid-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.vid-card .thumb{position:relative;padding-top:56.25%;overflow:hidden}
.vid-card .thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.vid-card:hover .thumb img{transform:scale(1.08)}
.vid-card .play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.45);opacity:0;transition:opacity .35s}
.vid-card:hover .play-btn{opacity:1}
.vid-card .play-btn i{width:56px;height:56px;background:var(--bmw-blue);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px rgba(0,102,177,.5)}
.vid-card .play-btn i::after{content:"";border-left:18px solid #fff;border-top:11px solid transparent;border-bottom:11px solid transparent;margin-left:4px}
.vid-card .dur{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);padding:2px 8px;border-radius:4px;font-size:12px;color:#fff}
.vid-card .info{padding:14px 16px}
.vid-card .info h3{font-size:15px;font-weight:600;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.5}
.vid-card .meta{display:flex;justify-content:space-between;font-size:12px;color:var(--text-sub)}

/* 分类标签导航 */
.3dsqu{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:28px}
.3dsqu span{padding:7px 20px;border-radius:20px;background:rgba(255,255,255,.05);color:var(--text-sub);cursor:pointer;font-size:14px;transition:all .3s;border:1px solid transparent}
.3dsqu span:hover,.3dsqu span.on{background:var(--bmw-blue);color:#fff;border-color:var(--bmw-blue)}

/* 双栏布局 */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding:30px 0;align-items:center}
.two-col .pic img{border-radius:var(--radius)}
.two-col .txt h3{font-size:24px;margin-bottom:14px;font-weight:700}
.two-col .txt p{color:var(--text-sub);margin-bottom:12px;font-size:15px}
.two-col .txt .btn{display:inline-block;padding:10px 28px;background:var(--bmw-blue);color:#fff;border-radius:8px;font-weight:600;transition:background .3s;margin-top:6px}
.two-col .txt .btn:hover{background:#004d8a}

/* 专家卡片 */
.expert-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:22px;padding-bottom:40px}
.expert-card{background:var(--card-bg);border-radius:var(--radius);padding:28px 20px;text-align:center;border:1px solid rgba(255,255,255,.04);transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-card .avatar{width:90px;height:90px;border-radius:50%;margin:0 auto 14px;overflow:hidden;border:3px solid var(--bmw-blue)}
.expert-card .avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h4{font-size:17px;margin-bottom:4px}
.expert-card .role{color:var(--bmw-accent);font-size:13px;margin-bottom:10px}
.expert-card p{font-size:13px;color:var(--text-sub);line-height:1.6}
.expert-card .links{margin-top:12px;display:flex;gap:8px;justify-content:center}
.expert-card .links a{padding:5px 14px;border:1px solid var(--bmw-blue);border-radius:6px;font-size:12px;color:var(--bmw-accent);transition:all .3s}
.expert-card .links a:hover{background:var(--bmw-blue);color:#fff}

/* FAQ手风琴 */
.faq-list{max-width:860px;margin:0 auto;padding-bottom:40px}
.faq-item{background:var(--card-bg);border-radius:var(--radius);margin-bottom:12px;border:1px solid rgba(255,255,255,.04);overflow:hidden}
.faq-item .q{padding:16px 20px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:15px;transition:background .3s}
.faq-item .q:hover{background:rgba(0,102,177,.1)}
.faq-item .q::after{content:"+";font-size:22px;color:var(--bmw-blue);transition:transform .3s}
.faq-item.open .q::after{transform:rotate(45deg)}
.faq-item .a{max-height:0;overflow:hidden;transition:max-height .4s ease;padding:0 20px}
.faq-item.open .a{max-height:400px;padding:0 20px 16px}
.faq-item .a p{color:var(--text-sub);font-size:14px;line-height:1.8}

/* 用户评论 */
.review-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;padding-bottom:40px}
.review-card{background:var(--card-bg);border-radius:var(--radius);padding:22px;border:1px solid rgba(255,255,255,.04)}
.review-card .stars{color:#f5a623;font-size:16px;margin-bottom:8px;letter-spacing:2px}
.review-card blockquote{font-size:14px;color:var(--text-sub);line-height:1.7;margin-bottom:12px;font-style:italic}
.review-card .reviewer{display:flex;align-items:center;gap:10px}
.review-card .reviewer .dot{width:36px;height:36px;border-radius:50%;background:var(--bmw-blue);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:14px}
.review-card .reviewer span{font-size:13px;color:var(--text-sub)}

/* 合作品牌墙 */
.gtdp8o{display:flex;flex-wrap:wrap;gap:20px;justify-content:center;padding:20px 0 40px}
.gtdp8o .xsqka{background:rgba(255,255,255,.04);border-radius:10px;padding:18px 30px;font-size:16px;font-weight:600;color:var(--text-sub);border:1px solid rgba(255,255,255,.06);transition:all .3s}
.gtdp8o .xsqka:hover{border-color:var(--bmw-blue);color:var(--bmw-accent)}

/* 社交分享 */
.yy6999{display:flex;gap:12px;justify-content:center;padding:20px 0 40px;flex-wrap:wrap}
.yy6999 a{display:flex;align-items:center;gap:6px;padding:8px 20px;border-radius:8px;font-size:14px;color:#fff;font-weight:500;transition:opacity .3s}
.yy6999 a:hover{opacity:.85}
.yy6999 .wx{background:#07c160}
.yy6999 .wb{background:#e6162d}
.yy6999 .dy{background:#161823}
.yy6999 .bl{background:#00a1d6}

/* 页脚 */
.go9b5{background:linear-gradient(180deg,#0d1b2a,#060d18);padding:50px 0 20px;border-top:2px solid var(--bmw-blue)}
.uuzdsx{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;padding-bottom:30px}
.uuzdsx h4{font-size:16px;margin-bottom:14px;color:#fff;position:relative;padding-bottom:8px}
.uuzdsx h4::after{content:"";position:absolute;bottom:0;left:0;width:30px;height:2px;background:var(--bmw-blue)}
.uuzdsx p,.uuzdsx a{font-size:13px;color:var(--text-sub);line-height:2}
.uuzdsx a:hover{color:var(--bmw-accent)}
.uuzdsx .qr-row{display:flex;gap:14px}
.uuzdsx .qr-row img{width:100px;border-radius:6px}
.incjnyzc{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.06);font-size:12px;color:#5a6578}

/* 面包屑 */
.crumb{padding:14px 0;font-size:13px;color:var(--text-sub)}
.crumb a{color:var(--bmw-accent)}
.crumb span{margin:0 6px;color:#555}

/* 内页通用 */
.rxxba{height:280px;position:relative;overflow:hidden}
.rxxba img{width:100%;height:100%;object-fit:cover}
.rxxba .mask{position:absolute;inset:0;background:rgba(13,27,42,.7);display:flex;align-items:center;justify-content:center}
.rxxba .mask h1{font-size:36px;font-weight:800}
.inner-content{padding:30px 0 50px}
.inner-content h2{font-size:24px;margin:30px 0 16px;font-weight:700}
.inner-content h3{font-size:20px;margin:24px 0 12px;font-weight:600;color:var(--bmw-accent)}
.inner-content p{color:var(--text-sub);margin-bottom:14px;font-size:15px;line-height:1.9}

/* 响应式 */
@media(max-width:900px){
.bo7p8m .wrap{flex-wrap:wrap}
.main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
.main-nav.show{display:flex}
.mob-toggle{display:block}
.mid7nmmj{height:360px}
.scdd2wtb h1{font-size:26px}
.two-col{grid-template-columns:1fr}
.uuzdsx{grid-template-columns:1fr 1fr}
.vid-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}
}
@media(max-width:600px){
.mid7nmmj{height:280px}
.scdd2wtb h1{font-size:22px}
.scdd2wtb p{font-size:14px}
.vg07di h2{font-size:22px}
.uuzdsx{grid-template-columns:1fr}
.vo3ute .wrap{flex-direction:column;gap:16px}
.vid-grid{grid-template-columns:1fr}
}