/* ===== 迅雷 - 蓝白科技风 ===== */
:root{
    --brand:#1e6fff;
    --brand-dark:#0d5ae0;
    --brand-light:#5b95ff;
    --deep:#0a1f44;
    --accent:#00c4b3;
    --bg:#f5f8fd;
    --card:#ffffff;
    --text:#1a2438;
    --text-light:#5a6a86;
    --text-faint:#8b98b0;
    --border:#e3e9f5;
    --shadow:0 2px 14px rgba(30,111,255,.08);
    --shadow-hover:0 14px 36px rgba(30,111,255,.18);
    --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{font-family:"PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);line-height:1.75;font-size:16px;overflow-x:hidden;background:
    radial-gradient(700px 460px at 8% 4%,rgba(30,111,255,.08),transparent 60%),
    radial-gradient(700px 460px at 92% 2%,rgba(0,196,179,.07),transparent 60%),
    var(--bg)}
a{text-decoration:none;color:var(--brand)}
a:hover{color:var(--brand-dark)}
img{max-width:100%;display:block}
h1,h2,h3,h4{line-height:1.32;font-weight:800;color:var(--text)}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== 顶栏 ===== */
.topbar{background:linear-gradient(90deg,var(--deep),#0d2f6b);color:#cfe0ff;padding:9px 0;text-align:center;font-size:13px;letter-spacing:.5px}
.topbar a{color:#fff;font-weight:700;text-decoration:underline}
.topbar a:hover{color:#9ec5ff}

/* ===== 导航 ===== */
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;background:var(--card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;width:100%}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:800;color:var(--text)}
.nav-logo img.logo-mark{width:32px;height:32px;object-fit:contain;flex-shrink:0}
.nav-logo:hover{color:var(--brand)}
.nav-links{display:flex;gap:4px;list-style:none;align-items:center}
.nav-links a{color:var(--text-light);font-weight:500;font-size:14px;padding:8px 14px;border-radius:8px;transition:all .18s}
.nav-links a:hover{color:var(--brand);background:#eef4ff}
.nav-links .nav-cta{background:linear-gradient(135deg,var(--brand),var(--brand-light));color:#fff!important;font-weight:600;border-radius:50px;padding:9px 20px}
.nav-links .nav-cta:hover{background:var(--brand-dark);color:#fff!important;box-shadow:0 6px 16px rgba(30,111,255,.3)}
.nav-toggle{display:none;font-size:24px;background:none;border:none;color:var(--text);cursor:pointer}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,#0a1f44 0%,#0d3a8f 60%,#1e6fff 100%);padding:70px 0 60px;color:#fff;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-80px;top:-80px;width:360px;height:360px;border-radius:50%;background:rgba(0,196,179,.18);filter:blur(60px)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;position:relative;z-index:2}
.hero-badge{display:inline-block;background:rgba(0,196,179,.2);color:#7ff0e5;padding:5px 14px;border-radius:50px;font-size:12px;font-weight:600;margin-bottom:18px}
.hero-text{text-align:left}
.hero-text h1{font-size:46px;font-weight:900;letter-spacing:.5px;line-height:1.22;margin-bottom:16px;color:#fff}
.hero-text h1 .hl{color:#7ff0e5}
.hero-text .desc{font-size:16px;color:#c9d9f5;margin:0 0 28px;max-width:560px}
.hero-stats{display:flex;justify-content:flex-start;gap:36px;margin-bottom:28px;flex-wrap:wrap}
.hero-stats .num{font-size:28px;font-weight:900;color:#fff}
.hero-stats .lbl{font-size:13px;color:#a9c4ee}
.hero-btns{display:flex;justify-content:flex-start;gap:14px;flex-wrap:wrap}
.btn-main{display:inline-block;background:linear-gradient(135deg,#00c4b3,#00a89a);color:#fff;padding:15px 34px;font-weight:700;font-size:16px;border-radius:50px;transition:all .2s;box-shadow:0 6px 18px rgba(0,196,179,.3)}
.btn-main:hover{color:#fff;transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,196,179,.42)}
.btn-outline{display:inline-block;padding:15px 34px;font-weight:700;font-size:16px;border-radius:50px;color:#fff;background:transparent;border:2px solid rgba(255,255,255,.6);transition:all .2s}
.btn-outline:hover{background:rgba(255,255,255,.12);color:#fff}

/* ===== 下载速度卡 ===== */
.speed-wrap{max-width:500px;margin:0 auto;justify-self:center;width:100%}
.speed-card{background:rgba(255,255,255,.08);backdrop-filter:blur(12px);padding:28px;border-radius:18px;border:1px solid rgba(255,255,255,.2)}
.speed-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;color:#cfe0ff;font-size:14px}
.speed-head .name{font-weight:700;color:#fff}
.speed-num{text-align:center;margin-bottom:16px}
.speed-num .val{font-size:52px;font-weight:900;color:#7ff0e5;line-height:1;font-family:Consolas,Monaco,monospace}
.speed-num .unit{font-size:18px;color:#a9c4ee;margin-left:4px}
.speed-num .state{font-size:13px;color:#c9d9f5;margin-top:6px}
.speed-bar{height:8px;background:rgba(255,255,255,.16);border-radius:4px;margin-bottom:14px;overflow:hidden}
.speed-bar .fill{height:100%;width:68%;border-radius:4px;background:linear-gradient(90deg,#00c4b3,#7ff0e5);animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.7}}
.speed-files{display:flex;justify-content:space-between;font-size:12px;color:#a9c4ee}

/* ===== 信任条 ===== */
.trust-bar{display:flex;justify-content:center;align-items:center;gap:44px;padding:30px 24px;background:var(--card);border-bottom:1px solid var(--border);flex-wrap:wrap}
.trust-item{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text-light);font-weight:600}
.trust-item .icon{font-size:22px}

/* ===== 通用区块 ===== */
.section{padding:72px 0}
.section-header{text-align:center;margin-bottom:44px}
.section-header h2{font-size:28px;font-weight:800;margin-bottom:12px}
.section-header p{color:var(--text-light);font-size:16px;max-width:640px;margin:0 auto}
.section-tag{display:inline-block;color:var(--brand);font-size:13px;font-weight:700;letter-spacing:2px;margin-bottom:10px}

/* 功能卡片 */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.feature-card{background:var(--card);padding:26px;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:all .22s}
.feature-card:hover{border-color:var(--brand);box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.feature-card .f-icon{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:16px;background:linear-gradient(135deg,#e8f1ff,#d7e8ff);color:var(--brand)}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-light)}
/* 横向居中排列 */
.feature-row{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:1080px;margin:0 auto}
.feature-row .feature-card{max-width:none}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.step-card{background:var(--card);padding:28px 24px;border:1px solid var(--border);border-radius:var(--radius);position:relative;box-shadow:var(--shadow)}
.step-card .step-num{width:46px;height:46px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:18px;margin-bottom:16px;color:#fff;background:linear-gradient(135deg,var(--brand),#00c4b3);font-family:Consolas,Monaco,monospace}
.step-card h3{font-size:17px;margin-bottom:8px}
.step-card p{font-size:14px;color:var(--text-light)}

/* 下载卡片 */
.dl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.dl-card{background:var(--card);padding:28px;text-align:center;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:all .22s}
.dl-card:hover{border-color:var(--brand);box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.dl-card .dl-icon{font-size:44px;margin-bottom:12px}
.dl-card h3{font-size:18px;margin-bottom:6px}
.dl-card .ver{font-size:13px;color:var(--text-faint);margin-bottom:16px}
.dl-card .btn-main{padding:12px 28px;font-size:15px}

/* FAQ 列表 */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:12px;margin-bottom:14px;overflow:hidden;box-shadow:var(--shadow)}
.faq-item summary{cursor:pointer;padding:18px 22px;font-weight:700;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;color:var(--brand);font-weight:700}
.faq-item[open] summary::after{content:"−"}
.faq-item[open]{border-color:var(--brand)}
.faq-item .faq-body{padding:0 22px 20px;color:var(--text-light);font-size:15px;border-top:1px dashed var(--border);padding-top:14px}

/* 文章 */
.article{max-width:760px;margin:0 auto;background:var(--card);padding:48px 56px;border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow)}
.article .art-meta{color:var(--text-faint);font-size:13px;margin-bottom:20px;display:flex;gap:16px;flex-wrap:wrap}
.article h1{font-size:30px;margin-bottom:18px}
.article h2{font-size:22px;margin:28px 0 12px;color:var(--brand)}
.article p{color:#3a4558;margin-bottom:16px;font-size:16px}
.article ul,.article ol{margin:0 0 16px 22px}
.article li{margin-bottom:8px;color:#3a4558}
.article strong{color:var(--brand-dark)}
.article .art-tip{background:#eef4ff;border-left:4px solid var(--brand);padding:14px 18px;margin:18px 0;font-size:15px;border-radius:8px}

/* 面包屑 */
.breadcrumb{font-size:13px;color:var(--text-faint);margin-bottom:20px}
.breadcrumb a{color:var(--text-faint)}
.breadcrumb a:hover{color:var(--brand)}

/* 404 */
.notfound{text-align:center;padding:90px 24px}
.notfound .code{font-size:110px;font-weight:900;background:linear-gradient(135deg,var(--brand),#00c4b3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;font-family:Consolas,Monaco,monospace}
.notfound h1{font-size:26px;margin:18px 0 12px}
.notfound p{color:var(--text-light);margin-bottom:28px}

/* ===== 页脚 ===== */
footer{background:var(--deep);padding:52px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:36px}
.footer-grid h4{color:#fff;margin-bottom:16px;font-size:15px}
.footer-grid a{color:#9db0cf;display:block;margin-bottom:10px;font-size:14px}
.footer-grid a:hover{color:#7ff0e5}
.footer-brand p{font-size:14px;line-height:1.8;margin-top:12px;max-width:280px;color:#9db0cf}
.footer-brand .logo{color:#fff;font-size:18px;font-weight:800;display:flex;align-items:center;gap:9px}
.footer-brand .logo img{width:32px;height:32px;object-fit:contain}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;text-align:center;font-size:13px;color:#6b7d9c}
.footer-bottom a{color:#9db0cf}

/* ===== 响应式 ===== */
@media(max-width:768px){
    .nav-links{display:none}
    .nav-toggle{display:block}
    .hero{padding:40px 0}
    .hero-grid{grid-template-columns:1fr;gap:32px}
    .hero-text h1{font-size:30px}
    .hero-stats{gap:22px}
    .trust-bar{gap:24px}
    .section{padding:48px 0}
    .section-header h2{font-size:24px}
    .article{padding:32px 24px}
    .footer-grid{grid-template-columns:1fr 1fr;gap:26px}
    .feature-row{grid-template-columns:1fr}
}
@media(max-width:480px){
    body{font-size:15px}
    .hero-text h1{font-size:25px}
    .hero-text .desc{font-size:15px}
    .btn-main,.btn-outline{padding:13px 26px;font-size:15px;margin-bottom:4px}
    .hero-btns{gap:10px}
    .hero-stats{gap:16px}
    .feature-grid,.dl-grid{grid-template-columns:1fr}
    .steps{grid-template-columns:1fr}
    .footer-grid{grid-template-columns:1fr}
    .section-header h2{font-size:22px}
    .article h1{font-size:24px}
    .notfound .code{font-size:72px}
    .nav{padding:12px 16px}
    .nav-inner{padding:0}
    .nav-logo{font-size:18px}
}