/* 疾风云 - 纯原生 CSS，移动端优先 */
:root{
  --bg:#f7f9fc;
  --surface:#ffffff;
  --text:#0f172a;
  --muted:#5b6478;
  --line:#e5e9f2;
  --brand:#2563eb;
  --brand-2:#06b6d4;
  --ok:#16a34a;
  --warn:#f59e0b;
  --radius:16px;
  --shadow:0 10px 30px rgba(15,23,42,.06);
  --max:1160px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 16px}
.section{padding:56px 0;scroll-margin-top:62px}
.section-head{text-align:center;max-width:720px;margin:0 auto 32px}
.section-head h2{font-size:26px;line-height:1.3;margin-bottom:10px}
.section-head p{color:var(--muted)}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--brand);background:rgba(37,99,235,.08);padding:4px 12px;border-radius:999px;margin-bottom:12px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 22px;border-radius:12px;font-weight:600;font-size:15px;border:1px solid transparent;transition:transform .15s ease,box-shadow .15s ease}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 20px rgba(37,99,235,.25)}
.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--line)}
.btn-block{display:flex;width:100%}

/* 页眉导航 */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px;position:relative}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:19px;color:var(--text)}
.logo:hover{text-decoration:none}
.logo img{width:32px;height:32px}
.nav-toggle{display:none}
.nav-burger{display:flex;flex-direction:column;justify-content:center;gap:5px;width:40px;height:40px;cursor:pointer;padding:9px}
.nav-burger span{display:block;height:2px;background:var(--text);border-radius:2px}
.nav-menu{display:none;position:absolute;top:62px;left:-16px;right:-16px;background:var(--surface);border-bottom:1px solid var(--line);padding:8px 16px 16px;list-style:none;box-shadow:var(--shadow)}
.nav-menu a{display:block;padding:12px 4px;color:var(--text);font-weight:500;border-bottom:1px solid var(--line)}
.nav-menu li:last-child a{border-bottom:0}
.nav-menu .btn{margin-top:10px;color:#fff;border-bottom:0}
.nav-toggle:checked ~ .nav-menu{display:block}

/* 主视觉 */
.hero{padding:40px 0 56px;background:radial-gradient(900px 400px at 85% 0%,rgba(6,182,212,.12),transparent 60%),radial-gradient(700px 400px at 0% 20%,rgba(37,99,235,.10),transparent 60%)}
.hero-grid{display:grid;gap:32px;align-items:center}
.hero h1{font-size:32px;line-height:1.25;letter-spacing:-.5px;margin-bottom:16px}
.hero h1 .grad{background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{color:var(--muted);font-size:17px;margin-bottom:24px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:24px}
.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;list-style:none}
.hero-stats li{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px;text-align:center}
.hero-stats strong{display:block;font-size:20px}
.hero-stats span{font-size:12px;color:var(--muted)}

/* 动态图卡 */
.live-card{background:#0b1220;color:#e2e8f0;border-radius:20px;padding:20px;box-shadow:0 20px 50px rgba(15,23,42,.25);position:relative;overflow:hidden}
.live-card::before{content:"";position:absolute;inset:-40% -20% auto auto;width:280px;height:280px;background:radial-gradient(circle,rgba(6,182,212,.35),transparent 70%);animation:float 8s ease-in-out infinite}
.live-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;position:relative}
.live-title{font-weight:700;font-size:15px}
.live-badge{display:flex;align-items:center;gap:6px;font-size:12px;color:#86efac}
.dot{width:8px;height:8px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 0 rgba(34,197,94,.6);animation:pulse 1.8s infinite}
.speed{display:flex;align-items:center;gap:16px;margin-bottom:16px;position:relative}
.gauge{width:96px;height:96px;flex:none}
.gauge .track{stroke:rgba(255,255,255,.1)}
.gauge .arc{stroke:url(#g);stroke-dasharray:240;stroke-dashoffset:240;animation:fill 2.4s ease-out forwards,breathe 4s 2.4s ease-in-out infinite}
.speed-num strong{font-size:28px;display:block;line-height:1.1}
.speed-num span{font-size:12px;color:#94a3b8}
.nodes{list-style:none;position:relative}
.nodes li{display:grid;grid-template-columns:72px 1fr 52px;align-items:center;gap:10px;padding:8px 0;border-top:1px solid rgba(255,255,255,.06);font-size:13px}
.bar{height:6px;background:rgba(255,255,255,.08);border-radius:6px;overflow:hidden}
.bar i{display:block;height:100%;border-radius:6px;background:linear-gradient(90deg,var(--brand),var(--brand-2));transform-origin:left;animation:load 1.6s ease-out both,wave 3s 1.6s ease-in-out infinite}
.nodes li:nth-child(2) .bar i{animation-delay:.15s,1.75s}
.nodes li:nth-child(3) .bar i{animation-delay:.3s,1.9s}
.nodes li:nth-child(4) .bar i{animation-delay:.45s,2.05s}
.nodes li:nth-child(5) .bar i{animation-delay:.6s,2.2s}
.ms{text-align:right;color:#86efac;font-variant-numeric:tabular-nums}
.live-foot{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;position:relative}
.chip{font-size:12px;padding:4px 10px;border-radius:999px;background:rgba(255,255,255,.08);color:#cbd5e1}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(34,197,94,.6)}70%{box-shadow:0 0 0 8px rgba(34,197,94,0)}100%{box-shadow:0 0 0 0 rgba(34,197,94,0)}}
@keyframes fill{to{stroke-dashoffset:40}}
@keyframes breathe{0%,100%{stroke-dashoffset:40}50%{stroke-dashoffset:60}}
@keyframes load{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes wave{0%,100%{transform:scaleX(1)}50%{transform:scaleX(.82)}}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(-30px,20px)}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.gauge .arc{stroke-dashoffset:40}}

/* 卡片网格 */
.grid{display:grid;gap:16px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.card h3{font-size:18px;margin:12px 0 8px}
.card p{color:var(--muted);font-size:15px}
.icon{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(6,182,212,.12));color:var(--brand)}
.icon svg{width:26px;height:26px}

/* 流媒体与 AI */
.unlock-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.unlock{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:4px}
.unlock h3{font-size:16px}
.unlock p{font-size:13px;color:var(--muted)}
.tag-ok{align-self:flex-start;font-size:12px;font-weight:600;color:var(--ok);background:rgba(22,163,74,.1);padding:2px 8px;border-radius:999px}
.tag-ai{color:#7c3aed;background:rgba(124,58,237,.1)}

/* 价格 */
.plans{display:grid;gap:16px;margin-bottom:32px}
.plan{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:28px 24px;display:flex;flex-direction:column}
.plan.hot{border:2px solid var(--brand);box-shadow:0 16px 40px rgba(37,99,235,.15)}
.plan .ribbon{position:absolute;top:-12px;left:24px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px}
.plan h3{font-size:20px}
.plan .desc{color:var(--muted);font-size:14px;margin-bottom:12px}
.price{font-size:36px;font-weight:800;line-height:1.1;margin-bottom:4px}
.price small{font-size:15px;font-weight:500;color:var(--muted)}
.price-note{font-size:13px;color:var(--muted);margin-bottom:16px}
.plan ul{list-style:none;margin-bottom:24px;flex:1}
.plan li{padding:6px 0 6px 26px;position:relative;font-size:15px}
.plan li::before{content:"";position:absolute;left:0;top:11px;width:16px;height:16px;border-radius:50%;background:rgba(22,163,74,.12) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8.5l2.5 2.5L12 5.5' fill='none' stroke='%2316a34a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/16px no-repeat}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.compare{width:100%;min-width:560px;border-collapse:collapse;font-size:14px}
.compare caption{text-align:left;padding:16px;font-weight:700}
.compare th,.compare td{padding:12px 14px;text-align:center;border-top:1px solid var(--line)}
.compare th:first-child,.compare td:first-child{text-align:left;color:var(--muted)}
.compare thead th{background:#f1f5fb;font-weight:700}
.compare .hl{background:rgba(37,99,235,.05);font-weight:600}
.table-tip{font-size:13px;color:var(--muted);margin-top:10px;text-align:center}

/* 文章卡片 */
.post-grid{display:grid;gap:16px}
.post{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .15s ease,box-shadow .15s ease}
.post:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.post-cover{height:120px;display:flex;align-items:flex-end;padding:14px;color:#fff;font-weight:700;font-size:14px;background:linear-gradient(135deg,#1e3a8a,#0891b2)}
.post:nth-child(3n+2) .post-cover{background:linear-gradient(135deg,#4c1d95,#2563eb)}
.post:nth-child(3n) .post-cover{background:linear-gradient(135deg,#0f766e,#0ea5e9)}
.post-body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.post-body h3{font-size:16px;line-height:1.45}
.post-body h3 a{color:var(--text)}
.post-body p{font-size:14px;color:var(--muted);flex:1}
.post-more{font-size:14px;font-weight:600}

/* 评价 */
.review{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.stars{color:var(--warn);letter-spacing:2px;font-size:15px}
.review p{margin:8px 0 12px;font-size:15px}
.who{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted)}
.avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:700;background:linear-gradient(135deg,var(--brand),var(--brand-2))}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:14px;margin-bottom:12px;padding:0 18px}
.faq summary{cursor:pointer;list-style:none;padding:16px 28px 16px 0;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:12px;font-size:22px;color:var(--brand)}
.faq details[open] summary::after{content:"−"}
.faq summary h3{font-size:16px;display:inline}
.faq details p{padding:0 0 16px;color:var(--muted)}

/* CTA 横幅 */
.cta-band{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;border-radius:24px;padding:36px 24px;text-align:center}
.cta-band h2{font-size:24px;margin-bottom:8px}
.cta-band p{opacity:.9;margin-bottom:20px}
.cta-band .btn{background:#fff;color:var(--brand)}

/* 页脚 */
.site-footer{background:#0b1220;color:#94a3b8;padding:36px 0 24px;margin-top:56px}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 28px;list-style:none;margin-bottom:24px}
.footer-links a{color:#e2e8f0;font-weight:500}
.footer-pbn{border-top:1px solid rgba(255,255,255,.08);padding-top:20px;text-align:center;font-size:14px;line-height:1.9}
.footer-pbn a{color:#38bdf8;font-weight:600}
.footer-pbn a:nth-of-type(2){color:#a78bfa}
.footer-pbn a:nth-of-type(3){color:#34d399}
.footer-pbn .sep{margin:0 8px;color:#475569}

/* 子页面 / 文章页 */
.page{padding:32px 0 8px}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:16px}
.breadcrumb a{color:var(--muted)}
.article{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:24px 18px;max-width:820px;margin:0 auto}
.article h1{font-size:26px;line-height:1.35;margin-bottom:12px}
.article .meta{font-size:13px;color:var(--muted);margin-bottom:20px}
.article h2{font-size:21px;margin:28px 0 12px;padding-left:12px;border-left:4px solid var(--brand)}
.article h3{font-size:17px;margin:20px 0 8px}
.article p{margin-bottom:14px}
.article ul,.article ol{margin:0 0 14px 22px}
.article li{margin-bottom:6px}
.article .toc{background:#f1f5fb;border-radius:12px;padding:14px 18px;margin-bottom:20px;font-size:15px}
.article .toc ol{margin-bottom:0}
.article .box{background:rgba(37,99,235,.06);border:1px solid rgba(37,99,235,.18);border-radius:12px;padding:16px;margin:20px 0}
.article table{width:100%;border-collapse:collapse;font-size:14px;margin-bottom:16px}
.article th,.article td{border:1px solid var(--line);padding:8px 10px;text-align:left}
.article th{background:#f1f5fb}
.article .tbl{overflow-x:auto}
.related{max-width:820px;margin:24px auto 0}
.related h2{font-size:19px;margin-bottom:12px}
.related ul{list-style:none;display:grid;gap:8px}
.related a{display:block;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px;color:var(--text)}

/* 平板及以上 */
@media (min-width:640px){
  .unlock-grid{grid-template-columns:repeat(4,1fr)}
  .post-grid,.grid-2{grid-template-columns:repeat(2,1fr)}
  .article{padding:36px 40px}
}
@media (min-width:900px){
  .nav-burger{display:none}
  .nav-menu{display:flex!important;position:static;align-items:center;gap:22px;padding:0;border:0;box-shadow:none;background:transparent}
  .nav-menu a{padding:0;border:0;font-size:15px}
  .nav-menu .btn{margin:0;padding:9px 18px}
  .hero{padding:72px 0 88px}
  .hero-grid{grid-template-columns:1.1fr .9fr;gap:48px}
  .hero h1{font-size:46px}
  .section{padding:80px 0}
  .section-head h2{font-size:32px}
  .grid-3,.plans,.post-grid{grid-template-columns:repeat(3,1fr)}
  .article h1{font-size:32px}
}