/* ============================================================
   快喵VPN 官方站点样式 —— 原生手写 CSS，无任何框架依赖
   深色科技风：渐变主色 #00e5ff -> #4f7bff
   ============================================================ */
:root{
  --bg:#050914; --bg2:#0a1226; --card:#0c1529; --card2:#101a33;
  --line:rgba(126,162,255,.14); --line2:rgba(126,162,255,.28);
  --txt:#eaf0ff; --sub:#8fa1c6; --brand:#00e5ff; --brand2:#4f7bff;
  --violet:#9f7bff; --ok:#31d0aa; --warn:#ffb454;
  --grad:linear-gradient(135deg,#00e5ff,#4f7bff);
  --r:16px; --shadow:0 18px 50px rgba(2,8,30,.55);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--txt);line-height:1.75;overflow-x:hidden;
  -webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
ul{list-style:none}
b,strong{font-weight:700}
em{font-style:normal}
.container{width:min(1180px,92%);margin:0 auto}
.sec{padding:84px 0}
.sec-alt{background:var(--bg2)}
.center{text-align:center;margin-bottom:46px}
.sec-tag{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--brand);
  border:1px solid var(--line2);border-radius:999px;padding:5px 16px;margin-bottom:14px}
.sec-title{font-size:clamp(26px,4vw,40px);line-height:1.25;font-weight:800}
.sec-title em{background:var(--grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent}
.sec-desc{color:var(--sub);max-width:680px;margin:14px auto 0}
.muted{color:var(--sub)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:12px;padding:11px 24px;font-size:15px;font-weight:600;cursor:pointer;
  border:1px solid transparent;transition:.2s;white-space:nowrap}
.btn-main{background:var(--grad);color:#04122a;box-shadow:0 8px 26px rgba(0,229,255,.28)}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 12px 34px rgba(0,229,255,.4)}
.btn-ghost{border-color:var(--line2);color:var(--txt);background:rgba(255,255,255,.03)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-big{padding:14px 32px;font-size:17px;border-radius:14px}

/* ---------- 顶部声明条 ---------- */
.notice{background:#101a33;border-bottom:1px solid var(--line);font-size:13px;
  color:var(--sub);position:relative;z-index:60}
.notice .container{display:flex;align-items:center;gap:10px;padding:8px 0}
.notice .ic{flex:0 0 auto}
.notice .close{margin-left:auto;background:none;border:0;color:var(--sub);cursor:pointer;
  font-size:16px;line-height:1;padding:2px 6px;border-radius:6px}
.notice .close:hover{color:var(--txt);background:rgba(255,255,255,.08)}
.notice a{color:var(--brand)}

/* ---------- 头部导航 ---------- */
.topbar{position:sticky;top:0;z-index:50;background:rgba(5,9,20,.82);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.topbar .container{padding:0}
.nav{display:flex;align-items:center;gap:22px;height:70px}
.logo{display:flex;align-items:center;gap:10px;color:var(--txt);font-size:20px;font-weight:800}
.logo img{border-radius:10px}
.menu{display:flex;align-items:center;gap:4px;margin-left:8px}
.menu>li{position:relative}
.menu a,.menu .dd-btn{display:block;padding:9px 14px;color:var(--txt);font-size:15px;
  border-radius:10px;cursor:pointer;transition:.15s}
.menu a:hover,.menu .dd-btn:hover{background:rgba(126,162,255,.1);color:var(--brand)}
.menu a.active{color:var(--brand)}
.dd-btn .arr{font-size:11px;opacity:.7;margin-left:4px}
.dd-panel{position:absolute;top:calc(100% + 8px);left:0;min-width:190px;background:var(--card2);
  border:1px solid var(--line);border-radius:14px;padding:8px;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s}
.dd:hover .dd-panel,.dd:focus-within .dd-panel{opacity:1;visibility:visible;transform:none}
.dd-panel a{padding:9px 12px;font-size:14px;color:var(--sub)}
.dd-panel a:hover{background:rgba(126,162,255,.1);color:var(--brand)}
.dd-cb{display:none}
.nav-cta{margin-left:auto}
.burger{display:none}

/* 移动端菜单 */
.mnav{display:none}
@media (max-width:900px){
  .menu,.nav-cta{display:none}
  .burger{display:flex;flex-direction:column;gap:5px;margin-left:auto;padding:10px;cursor:pointer}
  .burger span{width:22px;height:2px;background:var(--txt);border-radius:2px;transition:.2s}
  .mnav{display:block;max-height:0;overflow:hidden;transition:max-height .3s ease;
    border-top:1px solid var(--line)}
  #mnav-cb:checked ~ .mnav{max-height:78vh;overflow:auto}
  #mnav-cb:checked ~ .container .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  #mnav-cb:checked ~ .container .burger span:nth-child(2){opacity:0}
  #mnav-cb:checked ~ .container .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .mnav>ul{padding:10px 4% 20px}
  .mnav .dd-btn{display:flex;justify-content:space-between;align-items:center;width:100%;
    padding:12px 10px;color:var(--txt);border-radius:10px;cursor:pointer}
  .mnav .dd-panel{position:static;opacity:1;visibility:visible;transform:none;
    display:none;background:transparent;border:0;box-shadow:none;padding:0 0 8px 14px}
  .mnav .dd-cb:checked ~ .dd-panel{display:block}
  .mnav a{display:block;padding:10px;color:var(--sub);border-radius:8px}
  .mnav>ul>li>a{color:var(--txt);font-weight:600;padding:12px 10px}
}
.mnav-cb{display:none}

/* ---------- Hero ---------- */
.hero{position:relative;padding:88px 0 84px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:-40% -10% auto;height:130%;
  background:
    radial-gradient(46% 42% at 22% 26%,rgba(0,229,255,.20),transparent 62%),
    radial-gradient(42% 46% at 80% 20%,rgba(79,123,255,.22),transparent 64%),
    radial-gradient(40% 40% at 55% 90%,rgba(159,123,255,.14),transparent 66%);
  filter:blur(6px);pointer-events:none}
.hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(32px,4.6vw,52px);line-height:1.2;font-weight:800;letter-spacing:-.5px}
.hero h1 em{background:var(--grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent}
.hero .lead{color:var(--sub);font-size:17px;margin:20px 0 28px;max-width:560px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:38px;margin-top:38px;flex-wrap:wrap}
.hs b{display:block;font-size:28px;background:var(--grad);-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}
.hs span{font-size:13px;color:var(--sub)}

/* ---------- 客户端演示 ---------- */
.demowrap{position:relative}
.demo{background:linear-gradient(180deg,var(--card2),var(--card));border:1px solid var(--line2);
  border-radius:22px;box-shadow:var(--shadow);overflow:hidden}
.demo-bar{display:flex;align-items:center;gap:7px;padding:13px 16px;
  border-bottom:1px solid var(--line);font-size:13px;color:var(--sub)}
.demo-bar i{width:10px;height:10px;border-radius:50%;background:#2b3a63}
.demo-bar i:first-child{background:#ff5f57}.demo-bar i:nth-child(2){background:#febc2e}
.demo-bar i:nth-child(3){background:#28c840}
.demo-bar span{margin-left:8px}
.dm-cb{display:none}
.demo-body{padding:18px}
.demo-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.demo-loc em{font-size:17px;font-weight:700}
.demo-loc small{display:block;color:var(--sub);font-size:12px}
.demo-pill{font-size:12px;padding:5px 12px;border-radius:999px;border:1px solid var(--line2);color:var(--sub)}
#dm-conn:checked ~ .demo-body .demo-pill{background:rgba(49,208,170,.14);
  border-color:rgba(49,208,170,.5);color:var(--ok)}
.demo-nodes{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-bottom:14px}
.dn input{display:none}
.dn label{display:flex;justify-content:space-between;align-items:center;gap:6px;
  padding:9px 12px;border:1px solid var(--line);border-radius:11px;font-size:13px;
  cursor:pointer;color:var(--sub);transition:.15s}
.dn label:hover{border-color:var(--line2);color:var(--txt)}
.dn input:checked + label{border-color:var(--brand);color:var(--txt);
  background:rgba(0,229,255,.08)}
.dn .ms{font-size:11px;color:var(--brand)}
.gauge{background:rgba(126,162,255,.07);border:1px solid var(--line);border-radius:14px;
  padding:14px;text-align:center;margin-bottom:14px}
.gauge b{font-size:34px;font-weight:800}
.gauge span{display:block;font-size:12px;color:var(--sub)}
.dm-off{display:inline}.dm-on{display:none}
#dm-conn:checked ~ .demo-body .dm-off{display:none}
#dm-conn:checked ~ .demo-body .dm-on{display:inline}
#dm-conn:checked ~ .demo-body .gauge b{background:var(--grad);-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}
.demo-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:14px}
.dm{background:rgba(126,162,255,.06);border:1px solid var(--line);border-radius:12px;
  padding:10px;text-align:center}
.dm b{font-size:19px}.dm span{display:block;font-size:11px;color:var(--sub)}
.demo-conn{position:relative}
.demo-conn label{display:block;text-align:center;padding:12px;border-radius:12px;
  background:var(--grad);color:#04122a;font-weight:700;cursor:pointer;transition:.2s}
.demo-conn label::after{content:"一键连接"}
#dm-conn:checked ~ .demo-body .demo-conn label{background:rgba(126,162,255,.14);
  color:var(--txt);border:1px solid var(--line2)}
#dm-conn:checked ~ .demo-body .demo-conn label::after{content:"已连接 · 点击断开"}
.demo-switches{display:flex;gap:10px;margin-top:12px}
.sw{flex:1}
.sw input{display:none}
.sw label{display:block;text-align:center;padding:9px;border:1px solid var(--line);
  border-radius:11px;font-size:12px;color:var(--sub);cursor:pointer}
.sw input:checked + label{border-color:rgba(49,208,170,.5);color:var(--ok);
  background:rgba(49,208,170,.08)}

/* ---------- 数据统计卡 ---------- */
.statgrid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.statcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:22px 16px;text-align:center}
.statcard .ic{font-size:26px}
.statcard b{display:block;font-size:24px;margin:8px 0 2px}
.statcard span{font-size:13px;color:var(--sub)}

/* ---------- 功能卡 ---------- */
.featgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:24px 20px;transition:.2s}
.feat:hover{transform:translateY(-4px);border-color:var(--line2);box-shadow:var(--shadow)}
.feat .ic{font-size:28px}
.feat h3{font-size:17px;margin:12px 0 8px}
.feat p{font-size:14px;color:var(--sub)}

/* ---------- 节点与协议 ---------- */
.node-wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:34px;align-items:start}
.node{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:14px 18px;margin-bottom:12px}
.node .flag{font-size:24px}
.node b{display:block;font-size:15px}
.node div span{font-size:12px;color:var(--sub)}
.node .ms{margin-left:auto;font-size:14px;color:var(--brand);font-weight:700}
.protocols{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.protocols h3{font-size:18px;margin-bottom:14px}
.chiprow{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.chip{font-size:12px;padding:6px 13px;border-radius:999px;border:1px solid var(--line2);color:var(--sub)}
.chip.on{background:var(--grad);color:#04122a;border-color:transparent;font-weight:700}
.protocols li{position:relative;padding-left:20px;font-size:14px;color:var(--sub);margin-bottom:10px}
.protocols li::before{content:"›";position:absolute;left:0;color:var(--brand)}

/* ---------- 场景 ---------- */
.scenegrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.scene{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.scene .ic{font-size:28px}
.scene h3{font-size:17px;margin:12px 0 8px}
.scene p{font-size:14px;color:var(--sub)}

/* ---------- 步骤 ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.stepgrid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.step{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:26px 20px;text-align:center}
.step .ic{font-size:30px}
.step h3{font-size:17px;margin:12px 0 8px}
.step p{font-size:14px;color:var(--sub)}

/* ---------- 平台 ---------- */
.platgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.plat{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:24px 20px;text-align:center}
.plat .ic{font-size:34px}
.plat h3{font-size:18px;margin:12px 0 4px}
.plat .v{font-size:12px;color:var(--brand);margin-bottom:10px}
.plat p{font-size:13px;color:var(--sub);margin-bottom:16px}

/* ---------- 价格 ---------- */
.pricegrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:start}
.price{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px 24px}
.price.hot{border-color:var(--brand);position:relative;box-shadow:0 14px 44px rgba(0,229,255,.16)}
.price.hot::before{content:"最受欢迎";position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  background:var(--grad);color:#04122a;font-size:12px;font-weight:700;padding:4px 14px;border-radius:999px}
.price h3{font-size:17px;color:var(--sub)}
.price .amt{font-size:38px;font-weight:800;margin:10px 0 4px}
.price .amt small{font-size:15px;color:var(--sub);font-weight:500}
.price .per{font-size:13px;color:var(--brand);margin-bottom:16px}
.price li{position:relative;padding-left:22px;font-size:14px;color:var(--sub);margin-bottom:9px}
.price li::before{content:"✓";position:absolute;left:0;color:var(--ok)}
.price .btn{width:100%;margin-top:18px}

/* ---------- 关键词收录模块 ---------- */
.kwmod{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px}
.kwmod h3{font-size:19px;margin-bottom:6px}
.kwmod .sub{font-size:13px;color:var(--sub);margin-bottom:16px}
.kw-group{margin-bottom:14px}
.kw-group h4{font-size:14px;color:var(--brand);margin-bottom:8px;font-weight:600}
.kwcloud{display:flex;flex-wrap:wrap;gap:8px}
.kw{font-size:13px;padding:7px 13px;border-radius:999px;border:1px solid var(--line);
  color:var(--sub);transition:.15s}
.kw:hover{border-color:var(--brand);color:var(--brand)}
.kw.hot{border-color:rgba(0,229,255,.4);color:var(--brand)}
.kw-page .kwcloud{margin-bottom:26px}

/* ---------- FAQ ---------- */
.faqwrap{max-width:860px;margin:0 auto}
.faq{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:0 20px;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;list-style:none;padding:18px 34px 18px 0;font-size:16px;
  font-weight:600;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:4px;top:50%;transform:translateY(-50%);
  font-size:22px;color:var(--brand);transition:.2s}
.faq[open] summary::after{content:"−";transform:translateY(-50%) rotate(180deg)}
.faq .fa{padding:0 0 18px;font-size:14px;color:var(--sub)}

/* ---------- 用户评价 ---------- */
.tstgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.tst{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.tst .stars{color:#ffc857;font-size:14px;letter-spacing:2px}
.tst p{font-size:14px;color:var(--sub);margin:12px 0 16px}
.who{display:flex;align-items:center;gap:10px}
.ava{width:38px;height:38px;border-radius:50%;background:var(--grad);color:#04122a;
  display:flex;align-items:center;justify-content:center;font-weight:700;flex:0 0 auto}
.who b{display:block;font-size:14px}
.who span{font-size:12px;color:var(--sub)}

/* ---------- 新闻 / 博客卡片 ---------- */
.newsgrid,.bloggrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.ncard,.bcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  overflow:hidden;transition:.2s;display:flex;flex-direction:column}
.ncard:hover,.bcard:hover{transform:translateY(-4px);border-color:var(--line2);box-shadow:var(--shadow)}
.cover{height:132px;display:flex;align-items:flex-end;padding:12px 14px;
  background:linear-gradient(135deg,#12234c,#0b1733);position:relative;overflow:hidden}
.cover::after{content:"";position:absolute;inset:0;
  background:radial-gradient(60% 80% at 80% 10%,rgba(0,229,255,.25),transparent 60%)}
.cover .cv-tag{position:relative;z-index:1;font-size:12px;color:var(--brand);
  border:1px solid rgba(0,229,255,.4);border-radius:999px;padding:3px 10px;background:rgba(5,9,20,.55)}
.cover.c1{background:linear-gradient(135deg,#0d2b52,#081430)}
.cover.c2{background:linear-gradient(135deg,#123047,#0a1526)}
.cover.c3{background:linear-gradient(135deg,#26224e,#101029)}
.cover.c4{background:linear-gradient(135deg,#0b3546,#081726)}
.cover.c5{background:linear-gradient(135deg,#1c2a5c,#0b1230)}
.cover.c6{background:linear-gradient(135deg,#123a4e,#0a1a2b)}
.cover.c7{background:linear-gradient(135deg,#243a6e,#0d1430)}
.cover.c8{background:linear-gradient(135deg,#153c52,#0b1c2c)}
.cover.c9{background:linear-gradient(135deg,#2a2a5e,#111031)}
.cover.c10{background:linear-gradient(135deg,#0f3a55,#0a1628)}
.nb{padding:16px 18px 18px;display:flex;flex-direction:column;gap:8px;flex:1}
.nb h3{font-size:16px;line-height:1.5}
.nb h3 a{color:var(--txt)}
.nb h3 a:hover{color:var(--brand)}
.nb p{font-size:13px;color:var(--sub);flex:1}
.nb time{font-size:12px;color:var(--sub)}
.tag{display:inline-block;font-size:11px;color:var(--brand);border:1px solid rgba(0,229,255,.35);
  border-radius:999px;padding:2px 9px;width:max-content}
.more{display:inline-flex;align-items:center;gap:6px;margin-top:20px;justify-content:center;width:100%}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(135deg,rgba(0,229,255,.12),rgba(79,123,255,.16));
  border:1px solid var(--line2);border-radius:24px;padding:52px 40px;text-align:center}
.cta h2{font-size:clamp(24px,3.4vw,34px);font-weight:800}
.cta p{color:var(--sub);margin:12px 0 24px}

/* ---------- 下载页 ---------- */
.dl-hero{padding:80px 0 70px;position:relative;overflow:hidden}
.dl-hero::before{content:"";position:absolute;inset:-30% -10% auto;height:120%;
  background:radial-gradient(45% 40% at 25% 30%,rgba(0,229,255,.18),transparent 62%),
             radial-gradient(45% 45% at 78% 22%,rgba(79,123,255,.2),transparent 64%)}
.dl-hero .container{position:relative;display:grid;grid-template-columns:1.05fr .95fr;
  gap:50px;align-items:center}
.dl-hero h1{font-size:clamp(30px,4.2vw,46px);line-height:1.25;font-weight:800}
.dl-hero .lead{color:var(--sub);margin:18px 0 22px}
.dl-facts{display:flex;gap:30px;margin:22px 0 26px;flex-wrap:wrap}
.dl-facts b{display:block;font-size:20px}
.dl-facts span{font-size:12px;color:var(--sub)}
.vgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.vcard{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:26px 24px;
  position:relative}
.vcard.hotv{border-color:var(--brand);box-shadow:0 14px 44px rgba(0,229,255,.14)}
.vtag{font-size:11px;letter-spacing:2px;color:var(--brand);border:1px solid rgba(0,229,255,.35);
  border-radius:999px;padding:3px 11px}
.vcard h3{font-size:19px;margin:14px 0 4px}
.vsize{font-size:12px;color:var(--sub);margin-bottom:14px}
.vcard li{position:relative;padding-left:20px;font-size:14px;color:var(--sub);margin-bottom:8px}
.vcard li::before{content:"✓";position:absolute;left:0;color:var(--ok)}
.vcard .btn{width:100%;margin-top:16px}
.reqgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.req{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.req .ic{font-size:26px}
.req h4{font-size:16px;margin:10px 0 6px}
.req p{font-size:14px;color:var(--sub)}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r)}
table.cmp{width:100%;border-collapse:collapse;font-size:14px;min-width:620px}
table.cmp th,table.cmp td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left}
table.cmp th{background:rgba(126,162,255,.07);font-weight:700;white-space:nowrap}
table.cmp td:first-child{color:var(--sub);white-space:nowrap}
table.cmp tr:last-child td{border-bottom:0}

/* ---------- 文章页 ---------- */
.art{max-width:860px;margin:0 auto;padding:56px 0 30px}
.breadcrumb{font-size:13px;color:var(--sub);margin-bottom:18px}
.breadcrumb a{color:var(--sub)}
.breadcrumb a:hover{color:var(--brand)}
.art h1{font-size:clamp(26px,3.6vw,38px);line-height:1.3;font-weight:800}
.art-meta{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--sub);
  margin:16px 0 8px;align-items:center}
.art-meta .tag{align-self:center}
.art-lead{font-size:16px;color:var(--txt);background:rgba(126,162,255,.07);
  border-left:3px solid var(--brand);border-radius:0 12px 12px 0;padding:16px 18px;margin:20px 0}
.art-body h2{font-size:22px;margin:34px 0 14px;padding-left:14px;position:relative}
.art-body h2::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;
  border-radius:4px;background:var(--grad)}
.art-body p{color:#c3cee6;font-size:15.5px;margin-bottom:14px}
.art-body ul{margin:0 0 14px 20px;list-style:disc}
.art-body ul li{color:#c3cee6;font-size:15px;margin-bottom:8px}
.art-body strong{color:var(--txt)}
.art-faq{margin-top:38px}
.art-faq h2{font-size:22px;margin-bottom:16px}
.art-cta{margin-top:38px;background:linear-gradient(135deg,rgba(0,229,255,.1),rgba(79,123,255,.14));
  border:1px solid var(--line2);border-radius:18px;padding:26px;text-align:center}
.art-cta h3{font-size:19px;margin-bottom:8px}
.art-cta p{color:var(--sub);font-size:14px;margin-bottom:16px}
.art-nav{display:flex;justify-content:space-between;gap:16px;margin-top:34px;flex-wrap:wrap}
.art-nav a{font-size:14px;color:var(--sub)}
.art-nav a:hover{color:var(--brand)}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--line);background:var(--bg2);padding:56px 0 0;margin-top:40px}
.footgrid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:30px;padding-bottom:34px}
.fbrand p{font-size:13px;color:var(--sub);margin-top:12px;max-width:280px}
.footer h4{font-size:14px;margin-bottom:12px}
.footer li{margin-bottom:9px}
.footer li a{font-size:13px;color:var(--sub)}
.footer li a:hover{color:var(--brand)}
.footbar{border-top:1px solid var(--line);padding:16px 0;display:flex;gap:16px;
  flex-wrap:wrap;justify-content:space-between;font-size:12px;color:var(--sub)}
.flinks{display:flex;gap:16px;flex-wrap:wrap}
.flinks a{color:var(--sub)}
.flinks a:hover{color:var(--brand)}

/* ---------- 回到顶部 ---------- */
.totop{position:fixed;right:22px;bottom:26px;width:42px;height:42px;border-radius:50%;
  background:var(--card2);border:1px solid var(--line2);color:var(--brand);
  display:flex;align-items:center;justify-content:center;font-size:18px;z-index:40;
  opacity:.75;transition:.2s}
.totop:hover{opacity:1;transform:translateY(-3px)}

/* ---------- 渐显动画（仅在启用 JS 时隐藏，保证禁 JS 后内容完整） ---------- */
.js .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.js .reveal{opacity:1;transform:none;transition:none}}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .featgrid{grid-template-columns:repeat(2,1fr)}
  .statgrid{grid-template-columns:repeat(3,1fr)}
  .platgrid,.stepgrid4{grid-template-columns:repeat(2,1fr)}
  .newsgrid,.bloggrid,.tstgrid,.reqgrid{grid-template-columns:repeat(2,1fr)}
  .pricegrid,.vgrid{grid-template-columns:repeat(2,1fr)}
  .price.hot{grid-column:span 2;order:-1}
}
@media (max-width:768px){
  .sec{padding:60px 0}
  .hero-grid,.dl-hero .container,.node-wrap{grid-template-columns:1fr;gap:36px}
  .hero{padding:56px 0}
  .scenegrid,.steps,.newsgrid,.bloggrid,.tstgrid,.reqgrid,.pricegrid,.vgrid,
  .platgrid,.stepgrid4{grid-template-columns:1fr}
  .featgrid{grid-template-columns:1fr}
  .statgrid{grid-template-columns:repeat(2,1fr)}
  .price.hot{grid-column:auto;order:0}
  .footgrid{grid-template-columns:repeat(2,1fr)}
  .cta{padding:38px 22px}
  .art{padding-top:40px}
  .hero-stats{gap:24px}
}
@media (max-width:420px){
  .statgrid{grid-template-columns:1fr 1fr}
  .demo-nodes{grid-template-columns:1fr}
  .footgrid{grid-template-columns:1fr}
  .hero-stats{gap:18px}
  .hs b{font-size:22px}
}