:root{
  --bg:#0a0a0a;--bg2:#101114;--panel:#15171b;--line:rgba(255,255,255,.12);
  --text:#fff;--sub:rgba(255,255,255,.72);--dim:rgba(255,255,255,.5);
  --accent:#4a9fd8;--accent-d:#3b86bb;--ok:#46c28a;--warn:#e8a23a;
  --sans:"Noto Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --mono:"Fragment Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --display:"Dela Gothic One","Noto Sans SC",system-ui,sans-serif;
  --gutter:clamp(20px,5.5vw,80px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.7 var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.wrap{max-width:1280px;margin:0 auto;padding:0 var(--gutter)}
h1,h2,h3,p,ul,ol{margin:0}
h2{font-size:clamp(30px,4.2vw,52px);line-height:1.18;font-weight:900;letter-spacing:0}
h3{font-size:19px;line-height:1.4;font-weight:700}
.label{font:400 13px/1.4 var(--mono);letter-spacing:2px;color:var(--accent);text-transform:uppercase;margin-bottom:18px}
.lead{font-size:18px;line-height:1.8;color:var(--sub);margin-top:20px;max-width:640px}
.fine{font-size:13px;line-height:1.7;color:var(--dim);margin-top:18px}
.fine a{text-decoration:underline;text-underline-offset:3px}
a:focus-visible,button:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:16px 32px;border-radius:4px;background:var(--accent);color:#fff;font:700 16px/1 var(--sans);border:0;cursor:pointer;transition:background .15s,transform .15s}
.btn:hover{background:var(--accent-d)}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:transparent;outline:1px solid rgba(255,255,255,.4);outline-offset:-1px;font-weight:400}
.btn.ghost:hover{background:rgba(255,255,255,.1)}
.btn.small{padding:12px 22px;font-size:14px}
.btn.big{padding:20px 40px;font-size:17px}
.cta{display:flex;flex-wrap:wrap;gap:16px;margin-top:36px}

/* nav */
.nav{position:fixed;inset:0 0 auto 0;z-index:20;height:88px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0 var(--gutter);transition:background .25s,height .25s,backdrop-filter .25s}
.nav.solid{height:68px;background:rgba(10,10,10,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:12px;font:400 19px/1 var(--display)}
.brand img{border-radius:9px}
.nav nav{display:flex;gap:36px}
.nav-right{display:flex;align-items:center;gap:18px}
.lang{font:400 13px/1 var(--mono);letter-spacing:1px;padding:9px 12px;border:1px solid rgba(255,255,255,.3);border-radius:4px;color:rgba(255,255,255,.85);transition:background .15s}
.lang:hover{background:rgba(255,255,255,.12)}
.nav nav a{font-size:15px;color:rgba(255,255,255,.8);transition:color .15s}
.nav nav a:hover{color:#fff}

/* hero */
.hero{position:relative;min-height:max(100vh,720px);display:flex;align-items:flex-end;overflow:hidden;isolation:isolate}
.hero-photo{position:absolute;inset:0;z-index:-3;background:#1a1114 url("media/volcano-crater.webp") center 60%/cover no-repeat;animation:drift 28s ease-in-out infinite alternate}
.hero-scrim{position:absolute;inset:0;z-index:-2;background:linear-gradient(180deg,rgba(10,10,10,.55) 0%,rgba(10,10,10,0) 22%,rgba(10,10,10,.4) 50%,rgba(10,10,10,.92) 100%)}
@keyframes drift{from{transform:scale(1.04)}to{transform:scale(1.12) translate(-1.2%,-1%)}}
.hero-content{width:100%;max-width:1280px;margin:0 auto;padding:140px var(--gutter) 96px}
.kicker{font:400 13px/1.5 var(--mono);letter-spacing:2px;color:rgba(255,255,255,.7)}
.en .hero h1{font-size:clamp(44px,7.4vw,88px);line-height:1.08;letter-spacing:-.5px}
.hero h1{margin-top:26px;font-size:clamp(46px,8vw,92px);line-height:1.12;font-weight:900}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-sub{margin-top:28px;max-width:720px;font-size:18px;line-height:1.85;color:rgba(255,255,255,.9)}
.hero-coord{position:absolute;top:128px;right:var(--gutter);text-align:right;font:400 12px/1.6 var(--mono);color:rgba(255,255,255,.55);letter-spacing:1px}
.credit{position:absolute;right:var(--gutter);bottom:24px;font:400 11px/1.4 var(--mono);letter-spacing:1px;color:rgba(255,255,255,.4)}

/* facts */
.facts{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line);background:var(--bg)}
.facts>div{padding:34px var(--gutter);border-left:1px solid var(--line);display:flex;flex-direction:column;gap:6px}
.facts>div:first-child{border-left:0}
.facts b{font:400 clamp(26px,3vw,38px)/1.1 var(--display);color:#fff}
.facts span{font:400 12px/1.5 var(--mono);letter-spacing:1px;color:var(--dim)}

/* stages */
.stages{position:relative;padding:clamp(80px,10vw,150px) 0;overflow:hidden;isolation:isolate}
.stages-photo{position:absolute;inset:0;z-index:-2;background:#201a18 url("media/volcano-cone.webp") center/cover no-repeat}
.stages-scrim{position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,rgba(10,10,10,.94) 0%,rgba(10,10,10,.82) 45%,rgba(10,10,10,.66) 100%)}
.stages-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:clamp(36px,6vw,88px);align-items:center}
.ticks{list-style:none;padding:0;margin-top:34px;display:grid;gap:20px}
.ticks li{position:relative;padding-left:30px;color:var(--sub);font-size:15.5px;line-height:1.75}
.ticks li::before{content:"";position:absolute;left:2px;top:.62em;width:10px;height:10px;border-radius:2px;background:var(--accent)}
.ticks b{display:block;color:#fff;font-size:16.5px;margin-bottom:2px}
.ticks.narrow{gap:12px;margin-top:26px}
.ticks.narrow li{padding-left:28px}

/* css window mock */
.win{border-radius:10px;overflow:hidden;background:var(--panel);border:1px solid var(--line);box-shadow:0 40px 90px -30px rgba(0,0,0,.9)}
.titlebar{display:flex;align-items:center;gap:7px;padding:11px 14px;background:#1d1f24;border-bottom:1px solid var(--line);font-size:12px;color:var(--dim)}
.titlebar i{width:11px;height:11px;border-radius:50%;background:#ff5f57}
.titlebar i:nth-child(2){background:#febc2e}
.titlebar i:nth-child(3){background:#28c840}
.titlebar span{margin-left:10px}
.win-body{display:grid;grid-template-columns:170px 1fr;min-height:250px}
.win-body aside{padding:18px 16px;border-right:1px solid var(--line);background:#121317}
.win-body aside b{display:flex;justify-content:space-between;font-size:12px;color:var(--sub);margin-bottom:14px}
.win-body aside em{font:400 11px var(--mono);font-style:normal;color:var(--accent)}
.win-body ol{list-style:none;padding:0;display:grid;gap:9px}
.win-body li{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--dim)}
.win-body li span{flex:none;width:20px;height:20px;border-radius:50%;display:grid;place-items:center;font-size:11px;border:1px solid var(--line)}
.win-body li.done{color:var(--sub)}
.win-body li.done span{background:var(--ok);border-color:var(--ok);color:#06210f}
.win-body li.run{color:#fff;font-weight:700}
.win-body li.run span{border-color:var(--accent)}
.spin{width:10px;height:10px;border:2px solid var(--accent);border-top-color:transparent;border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.win-body section{padding:20px;display:grid;gap:16px;align-content:start}
.progress{height:8px;border-radius:99px;background:rgba(255,255,255,.1);overflow:hidden}
.progress div{height:100%;border-radius:99px;background:var(--accent)}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.stat-row div{padding:10px 12px;border-radius:6px;background:rgba(255,255,255,.05)}
.stat-row b{display:block;font:400 19px/1.2 var(--mono)}
.stat-row small{color:var(--dim);font-size:11px}
.frames{display:grid;grid-template-columns:repeat(6,1fr);gap:6px}
.frames i{aspect-ratio:16/10;border-radius:4px;background:rgba(255,255,255,.06)}
.frames i.d{background:linear-gradient(135deg,#5a3a30,#2b1c1a)}
.frames i.r{background:linear-gradient(135deg,#7a4a30,#3a2018);outline:1px solid var(--accent)}
.queue{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}
.queue>div{padding:14px 16px;border-radius:8px;background:rgba(21,23,27,.86);border:1px solid var(--line);display:grid;gap:8px;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.queue b{font-size:14px}
.pill{justify-self:start;padding:2px 9px;border-radius:99px;font:400 11px/1.6 var(--mono)}
.pill.ok{background:rgba(70,194,138,.16);color:var(--ok)}
.pill.run{background:rgba(74,159,216,.18);color:var(--accent)}
.pill.wait{background:rgba(232,162,58,.16);color:var(--warn)}
.pill.pause{background:rgba(255,255,255,.1);color:var(--sub)}

/* skins */
.skins{padding-top:clamp(80px,10vw,150px);padding-bottom:clamp(60px,8vw,110px)}
.skins-head{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,5vw,72px);align-items:end}
.skins-head .lead{margin:0}
.tabs{display:flex;flex-wrap:wrap;gap:10px;margin:44px 0 22px}
.tabs button{font:400 14px/1 var(--sans);color:var(--sub);background:transparent;border:1px solid var(--line);border-radius:4px;padding:12px 20px;cursor:pointer;transition:all .15s}
.tabs button:hover{color:#fff;border-color:rgba(255,255,255,.4)}
.tabs button[aria-selected="true"]{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:700}
.shot{position:relative;border-radius:10px;overflow:hidden;border:1px solid var(--line);box-shadow:0 50px 110px -40px rgba(74,159,216,.28),0 40px 90px -30px #000;background:var(--panel)}
.shot img{width:100%;height:auto}
.era{position:absolute;top:14px;right:14px;z-index:2;padding:5px 12px;border-radius:3px;background:rgba(10,10,10,.78);font:400 12px/1.4 var(--mono);letter-spacing:2px;color:#fff}
.caption{margin-top:18px;color:var(--sub);font-size:15px}

/* features */
.features{padding:clamp(70px,9vw,130px) 0;background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);margin-top:56px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.grid article{padding:34px 30px 38px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);transition:background .2s}
.grid article:hover{background:rgba(255,255,255,.03)}
.grid span{display:block;font:400 12px/1 var(--mono);letter-spacing:2px;color:var(--accent);margin-bottom:22px}
.grid p{margin-top:10px;color:var(--sub);font-size:15px;line-height:1.8}

/* buy */
.buy{position:relative;padding:clamp(90px,12vw,170px) 0 clamp(80px,10vw,130px);overflow:hidden;isolation:isolate}
.buy-photo{position:absolute;inset:0;z-index:-2;background:#1a1d1f url("media/volcano-coast.webp") center/cover no-repeat}
.buy-scrim{position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(10,10,10,.88) 0%,rgba(10,10,10,.55) 45%,rgba(10,10,10,.9) 100%)}
.card{max-width:640px;margin:0 auto;padding:clamp(30px,5vw,56px);border-radius:8px;background:rgba(14,15,18,.78);border:1px solid rgba(255,255,255,.16);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);text-align:center}
.card .ticks{text-align:left;max-width:460px;margin-left:auto;margin-right:auto}
.card .cta{justify-content:center}
.price{margin-top:6px;font:400 clamp(72px,12vw,116px)/1 var(--display);letter-spacing:-1px}
.price span{font-size:.3em;vertical-align:.95em;margin-right:6px;color:var(--accent)}
.price-note{margin-top:12px;color:var(--sub)}

/* feedback */
.feedback{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,6vw,90px);align-items:center;padding-top:clamp(70px,9vw,130px);padding-bottom:clamp(70px,9vw,130px)}
.links{display:grid;gap:12px}
.links a{display:flex;flex-direction:column;gap:2px;padding:20px 24px;border:1px solid var(--line);border-radius:6px;transition:border-color .15s,background .15s}
.links a:hover{border-color:var(--accent);background:rgba(74,159,216,.08)}
.links b{font-size:17px}
.links span{font-size:14px;color:var(--dim)}

footer{padding:40px var(--gutter) 52px;border-top:1px solid var(--line);text-align:center;color:var(--sub);font-size:14px}
footer .fine{margin-top:8px}

/* reveal (only when JS is on) */
.js .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.js .reveal.in{opacity:1;transform:none}

@media (max-width:960px){
  .nav nav{display:none}
  .stages-grid,.skins-head,.feedback{grid-template-columns:1fr}
  .grid{grid-template-columns:repeat(2,1fr)}
  .facts{grid-template-columns:repeat(2,1fr)}
  .facts>div:nth-child(3){border-left:0}
  .facts>div:nth-child(n+3){border-top:1px solid var(--line)}
  .hero-coord{display:none}
}
@media (max-width:620px){
  .nav{height:72px}
  .grid{grid-template-columns:1fr}
  .win-body{grid-template-columns:1fr}
  .win-body aside{border-right:0;border-bottom:1px solid var(--line)}
  .queue{grid-template-columns:1fr}
  .btn{padding:15px 24px}
  .hero-content{padding-bottom:84px}
  .hero-photo{background-position:50% 100%}
  .credit{left:var(--gutter);right:auto}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .hero-photo,.spin{animation:none}
  .js .reveal{opacity:1;transform:none;transition:none}
}