@font-face{font-family:"Inter";src:url(/assets/fonts/inter-latin.woff2) format("woff2");font-weight:100 900;font-display:swap}
:root{
  --paper:#ffffff;
  --paper-2:#f4f4f6;
  --card:#ffffff;
  --ink:#141416;
  --ink-2:#55555c;
  --ink-3:#8e8e95;
  --rule:#e4e4e8;
  --accent:#ff5b22;
  --serif:"New York","Iowan Old Style","Source Han Serif SC","Songti SC",Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Helvetica Neue",sans-serif;
  --mono:"SF Mono",ui-monospace,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.55 var(--sans);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
::selection{background:var(--accent);color:#fff}

.wrap{max-width:1180px;margin:0 auto;padding:0 28px}

/* nav */
nav{position:sticky;top:0;z-index:50;height:64px;padding:0 28px;pointer-events:none}
nav.scrolled{padding:0 8px}
nav .wrap{pointer-events:auto;box-sizing:border-box;display:flex;align-items:center;gap:28px;height:64px;max-width:1124px;padding:0;margin:0 auto;border:1px solid transparent;border-radius:999px;transition:max-width .45s cubic-bezier(.2,.8,.2,1),height .45s cubic-bezier(.2,.8,.2,1),transform .45s cubic-bezier(.2,.8,.2,1),padding .45s,background .3s,border-color .3s,box-shadow .3s}
nav.scrolled .wrap{max-width:1204px;height:56px;padding:0 40px;transform:translateY(12px);background:rgb(255 255 255 / .78);backdrop-filter:blur(16px) saturate(1.5);-webkit-backdrop-filter:blur(16px) saturate(1.5);border-color:var(--rule);box-shadow:0 8px 28px -12px rgb(20 20 22 / .18)}
nav.scrolled .brand img{width:26px;height:26px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font:700 15px/1 "Inter",var(--sans);letter-spacing:.08em;text-transform:uppercase}
.brand img{width:28px;height:28px;transition:width .3s,height .3s}
nav .links{display:flex;gap:22px;margin-left:auto;font-size:14px;color:var(--ink-2)}
nav .links a{text-decoration:none}
nav .links a:hover{color:var(--ink)}
nav .gh{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--ink-2);text-decoration:none}
nav .gh:hover{color:var(--ink)}
nav .gh svg{width:18px;height:18px}
.lang{display:flex;flex-shrink:0;white-space:nowrap;border:1px solid var(--rule);border-radius:999px;padding:2px;font-size:12px}
.lang button{all:unset;cursor:pointer;padding:4px 10px;border-radius:999px;color:var(--ink-2)}
.lang button[aria-pressed=true]{background:var(--ink);color:var(--paper)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;height:48px;padding:0 22px;border-radius:12px;font:600 15px/1 var(--sans);text-decoration:none;cursor:pointer;border:1.5px solid var(--ink);transition:transform .15s,box-shadow .15s,background .15s}
.btn svg{width:18px;height:18px}
.btn-ink{background:var(--ink);color:var(--paper);box-shadow:4px 4px 0 var(--accent)}
.btn-ink:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--accent)}
.btn-ink:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--accent)}
.btn-line{background:var(--card);color:var(--ink)}
.btn-line:hover{background:var(--paper-2)}
.btn small{font-weight:500;opacity:.6;font-size:12px}

/* hero */
.hero{padding-top:72px;padding-bottom:40px;display:grid;grid-template-columns:minmax(0,1fr) 480px;gap:56px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font:500 12px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2);border:1px solid var(--rule);background:var(--card);padding:7px 11px;border-radius:999px}
.eyebrow i{width:7px;height:7px;border-radius:50%;background:#2fbf71;box-shadow:0 0 0 3px #2fbf7122;animation:pulse 2s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 6px #2fbf7100}}
h1{font:600 clamp(44px,6.2vw,78px)/1.02 var(--serif);letter-spacing:-.03em;margin:22px 0 22px}
h1 em{font-style:italic;font-weight:500;background:linear-gradient(transparent 64%,var(--accent) 64%,var(--accent) 86%,transparent 86%) no-repeat 0 0/0 100%;-webkit-box-decoration-break:clone;box-decoration-break:clone;animation:mark .9s .5s cubic-bezier(.2,.8,.2,1) forwards}
@keyframes mark{to{background-size:100% 100%}}
html[lang=zh] h1{letter-spacing:0;line-height:1.14;font-size:clamp(30px,4.6vw,60px)}
html[lang=zh] h1 em{white-space:nowrap;background:none;animation:none;font-style:normal;font-weight:inherit}
.lede{font-size:19px;color:var(--ink-2);max-width:31em;margin:0 0 32px}
.ctas{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.meta{margin-top:18px;font-size:13px;color:var(--ink-3)}

.runtimes{margin:-8px 0 30px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.runtimes>span{font:500 11px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3)}
.runtimes ul{display:flex;gap:8px;margin:0;padding:0;list-style:none}
.runtimes li{position:relative;width:34px;height:34px;border-radius:9px;display:grid;place-items:center;box-shadow:0 0 0 1px rgb(0 0 0 / .08);transition:transform .2s cubic-bezier(.2,.8,.2,1)}
.runtimes li svg{width:19px;height:19px}
.runtimes li.raster{overflow:hidden}
.runtimes li.raster img{width:100%;height:100%;display:block}
.runtimes li span{position:absolute;bottom:calc(100% + 8px);left:50%;transform:translate(-50%,4px);white-space:nowrap;font:500 12px/1 var(--sans);color:var(--paper);background:var(--ink);padding:6px 8px;border-radius:6px;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s}
.runtimes li:hover{transform:translateY(-3px)}
.runtimes li:hover span{opacity:1;transform:translate(-50%,0)}
.runtimes li.raster:hover{overflow:visible}
.runtimes li.raster:hover img{border-radius:9px}

/* live demo */
.demo{position:relative;background:var(--card);border:1.5px solid var(--ink);border-radius:18px;box-shadow:10px 10px 0 var(--ink);overflow:hidden;transform:rotate(.6deg);transition:transform .4s}
.demo:hover{transform:rotate(0)}
.demo-head{display:flex;align-items:center;gap:10px;padding:13px 16px;border-bottom:1px solid var(--rule);font:600 15px/1 var(--serif)}
.demo-head .hash{width:22px;height:22px;display:grid;place-items:center;border:1.5px solid var(--ink);border-radius:6px;font:700 13px/1 var(--mono);background:#ffe9a8}
.demo-head .who{margin-left:auto;display:flex}
.demo-head .who span{width:24px;height:24px;border-radius:7px;border:1.5px solid var(--card);margin-left:-6px;display:grid;place-items:center;font:700 11px/1 var(--sans);color:#fff}
.feed{height:340px;overflow:hidden;padding:16px 18px;display:flex;flex-direction:column;justify-content:flex-end;gap:14px;mask-image:linear-gradient(transparent,#000 22%)}
.msg{display:flex;gap:11px;animation:in .45s cubic-bezier(.2,.8,.2,1) both}
@keyframes in{from{opacity:0;transform:translateY(10px)}}
.av{flex:none;width:32px;height:32px;border-radius:9px;border:1.5px solid var(--ink);display:grid;place-items:center;font:700 13px/1 var(--sans);color:var(--ink)}
.msg b{font-size:14px}
.msg .tag{font:500 10px/1 var(--mono);text-transform:uppercase;letter-spacing:.06em;border:1px solid var(--rule);border-radius:4px;padding:2px 5px;margin-left:6px;color:var(--ink-2);vertical-align:2px}
.msg time{font-size:11px;color:var(--ink-3);margin-left:6px}
.msg p{margin:3px 0 0;font-size:14.5px;line-height:1.5}
.mention{background:#e7efff;color:#2448c7;border-radius:4px;padding:0 3px;font-weight:600}
.task{display:inline-flex;align-items:center;gap:8px;margin-top:8px;border:1.5px solid var(--ink);border-radius:9px;padding:7px 10px;font-size:13px;background:var(--paper);box-shadow:2px 2px 0 var(--ink)}
.task code{font:600 12px/1 var(--mono);color:var(--ink-2)}
.pill{font:600 10px/1 var(--mono);text-transform:uppercase;letter-spacing:.06em;border-radius:999px;padding:4px 7px;border:1px solid}
.pill.prog{color:#b86200;border-color:#f0b35c;background:#fff4e2}
.pill.rev{color:#6b3fd6;border-color:#b9a2f2;background:#f3eeff}
.pill.done{color:#13814b;border-color:#8fd6b0;background:#e7f8ef}
.typing{display:inline-flex;gap:4px;padding:6px 0}
.typing i{width:6px;height:6px;border-radius:50%;background:var(--ink-3);animation:dot 1s infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes dot{40%{transform:translateY(-4px);background:var(--ink)}}
.composer{border-top:1px solid var(--rule);padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.composer .hint{font-size:12px;color:var(--ink-3)}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{all:unset;cursor:pointer;font-size:13px;white-space:nowrap;border:1.5px solid var(--ink);border-radius:999px;padding:6px 12px;background:var(--card);transition:background .15s,transform .15s}
.chip:hover{background:#ffe9a8;transform:translateY(-1px)}
.chip[aria-pressed=true]{background:var(--ink);color:var(--paper)}
.sticker{position:absolute;z-index:2;font:700 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;background:var(--accent);color:#fff;border:1.5px solid var(--ink);padding:8px 10px;box-shadow:3px 3px 0 var(--ink);transform:rotate(-8deg);top:-14px;right:28px}

/* marquee */
.strip{border-top:1.5px solid var(--ink);border-bottom:1.5px solid var(--ink);background:var(--ink);color:var(--paper);overflow:hidden;margin:56px 0 0}
.strip div{display:flex;gap:48px;white-space:nowrap;padding:14px 0;font:500 italic 22px/1 var(--serif);animation:scroll 38s linear infinite;width:max-content}
.strip span::after{content:"✳";font-style:normal;color:var(--accent);margin-left:48px}
@keyframes scroll{to{transform:translateX(-50%)}}

/* sections */
section{padding:110px 0}
/* film: the 9:16 promo beside its copy */
.film{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:72px;align-items:center}
.film-frame{position:relative;width:min(340px,80vw);aspect-ratio:886/1920;border:1.5px solid var(--ink);border-radius:28px;overflow:hidden;background:var(--paper-2);box-shadow:10px 10px 0 var(--ink)}
.film-frame video{display:block;width:100%;height:100%;object-fit:cover}
.film-sound{all:unset;cursor:pointer;position:absolute;right:14px;bottom:14px;display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:rgb(20 20 22 / .72);color:#fff;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.film-sound svg{width:18px;height:18px}
.film-sound .on,.film-sound[aria-pressed=true] .off{display:none}
.film-sound[aria-pressed=true] .on{display:inline}
.film-sound:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.kicker{font:500 12px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
h2{font:600 clamp(34px,4.4vw,54px)/1.06 var(--serif);letter-spacing:-.025em;margin:0 0 18px;max-width:16em}
.kicker+h2{margin-top:14px}
html[lang=zh] h2{letter-spacing:0;line-height:1.2;max-width:none;text-wrap:balance}
.sub{font-size:18px;color:var(--ink-2);max-width:36em;margin:0}

/* features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:56px}
.feat{background:var(--card);border:1.5px solid var(--ink);border-radius:16px;padding:26px 24px 28px;position:relative;transition:transform .25s,box-shadow .25s;box-shadow:0 0 0 var(--ink)}
.feat:hover{transform:translate(-4px,-4px);box-shadow:6px 6px 0 var(--ink)}
.feat .glyph{width:52px;height:52px;border:1.5px solid var(--ink);border-radius:12px;display:grid;place-items:center;margin-bottom:22px;box-shadow:3px 3px 0 var(--ink)}
.feat .glyph svg{width:26px;height:26px}
.feat h3{font:600 23px/1.2 var(--serif);margin:0 0 10px;letter-spacing:-.01em}
.feat p{margin:0;color:var(--ink-2);font-size:15.5px}
.feat ul{margin:16px 0 0;padding:0;list-style:none;font-size:14px;color:var(--ink-2)}
.feat li{padding:7px 0;border-top:1px dashed var(--rule);display:flex;gap:8px}
.feat li::before{content:"→";color:var(--accent)}

/* showcase */
/* each step gets ~65vh of scroll while the stage stays pinned */
.track{position:relative;margin-top:40px}
.track-pad{height:130vh}
.show{position:sticky;top:0;height:100vh;display:grid;grid-template-columns:320px 1fr;gap:48px;align-items:center;padding:88px 0 40px;box-sizing:border-box}
.tabs{display:flex;flex-direction:column;gap:6px}
.tab{all:unset;cursor:pointer;padding:18px 18px;border-radius:14px;border:1.5px solid transparent;transition:background .2s,border-color .2s}
.tab:hover{background:var(--paper-2)}
.tab[aria-selected=true]{background:var(--card);border-color:var(--ink);box-shadow:4px 4px 0 var(--ink)}
.tab b{display:block;font:600 19px/1.25 var(--serif)}
.tab span{display:block;font-size:14px;color:var(--ink-2);margin-top:4px}
.tab .bar{height:2px;background:var(--rule);margin-top:12px;border-radius:2px;overflow:hidden;display:none}
.tab[aria-selected=true] .bar{display:block}
.tab .bar i{display:block;height:100%;background:var(--accent);width:0;transition:width .1s linear}
.tour-desc{display:none}
.tab:not([aria-selected=true]){opacity:.55}
.tab:not([aria-selected=true]):hover{opacity:1}
.tab{transition:background .2s,border-color .2s,opacity .3s,box-shadow .3s}
.stage{position:relative;aspect-ratio:4/3;max-height:calc(100vh - 200px);justify-self:center;width:100%;max-width:calc((100vh - 200px) * 4 / 3);perspective:1400px}
.device{position:absolute;inset:0;border:1.5px solid var(--ink);border-radius:26px;background:var(--ink);padding:12px;box-shadow:14px 14px 0 var(--paper-2),14px 14px 0 1.5px var(--ink);transition:transform .5s cubic-bezier(.2,.8,.2,1);transform-style:preserve-3d}
.device img{width:100%;height:100%;object-fit:cover;object-position:top left;border-radius:15px;display:block;opacity:0;position:absolute;inset:12px;width:calc(100% - 24px);height:calc(100% - 24px);transition:opacity .45s}
.device img.on{opacity:1}
.phone{position:absolute;right:-26px;bottom:-34px;width:27%;aspect-ratio:1206/2622;border:1.5px solid var(--ink);border-radius:30px;background:var(--ink);padding:7px;box-shadow:8px 8px 0 var(--accent);transition:transform .5s cubic-bezier(.2,.8,.2,1)}
.phone img{width:100%;height:100%;object-fit:cover;border-radius:23px;display:block}

/* principles */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0;margin-top:56px;border-top:1.5px solid var(--ink)}
.prin{padding:34px 34px 36px 0;border-bottom:1px solid var(--rule)}
.prin:nth-child(even){padding-left:34px;padding-right:0;border-left:1px solid var(--rule)}
.prin .n{font:500 13px/1 var(--mono);color:var(--ink-3)}
.prin h3{font:600 26px/1.2 var(--serif);margin:12px 0 8px;letter-spacing:-.01em}
.prin p{margin:0;color:var(--ink-2)}

/* self-host */
.sh{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center;border:1.5px dashed var(--ink-3);border-radius:28px;padding:56px}
.sh-cta{margin-top:28px}
.sh-list{margin:24px 0 0;padding:0;list-style:none;font-size:15px;color:var(--ink-2)}
.sh-list li{padding:9px 0;border-top:1px dashed var(--rule);display:flex;gap:10px}
.sh-list li::before{content:"→";color:var(--accent)}
.sh-term{background:var(--ink);color:#e9e9ee;border-radius:16px;overflow:hidden;opacity:.92}
.sh-bar{display:flex;gap:6px;padding:12px 14px;border-bottom:1px solid #2a2a2f}
.sh-bar i{width:10px;height:10px;border-radius:50%;background:#3a3a40}
.sh-term pre{margin:0;padding:20px 22px 24px;font:13px/1.8 var(--mono);white-space:pre-wrap}
.sh-term .c{color:#7d7d86}.sh-term .p{color:var(--accent)}.sh-term .o{color:#7fd6a4}.sh-term .h{color:#fff;border-bottom:1px solid #5b5b62}

/* download */
.dl{background:var(--ink);color:var(--paper);border-radius:28px;padding:72px 56px;display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center;position:relative;overflow:hidden}
.dl h2{color:var(--paper);margin-top:0}
.dl .sub{color:#b9b6ae}
.dl .btns{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.dl .btn-ink{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.dl .btn-line{background:transparent;color:var(--paper);border-color:#5b5a60}
.dl .btn-line:hover{background:#26262a}
.dl .ver{font:500 12px/1.4 var(--mono);color:#8d8b90;margin-top:4px}
.iso{position:absolute;right:-60px;top:-60px;width:360px;opacity:.08;filter:invert(1);pointer-events:none}

footer{padding:56px 0 64px;font-size:14px;color:var(--ink-3)}
footer .wrap{display:flex;gap:24px;align-items:center;flex-wrap:wrap}
footer a{text-decoration:none}
footer a:hover{color:var(--ink)}
footer .r{margin-left:auto;display:flex;gap:22px}

/* reveal */
.rv{opacity:0;transform:translateY(24px);transition:opacity .8s cubic-bezier(.2,.8,.2,1),transform .8s cubic-bezier(.2,.8,.2,1)}
.rv.on{opacity:1;transform:none}

@media (max-width:900px){
  .track{margin-top:28px}
  .track-pad{height:110vh}
  .show{top:76px;height:auto;grid-template-columns:minmax(0,1fr);grid-template-rows:auto;align-content:start;align-items:start;gap:16px;padding:0 0 24px}
  .tour-desc{display:block;margin:0;min-height:3em;font-size:15px;color:var(--ink-2);text-align:center}
  .tabs{flex-direction:row;gap:6px}
  .tab{flex:1;padding:10px 8px;text-align:center}
  .tab span{display:none}
  .tab b{font-size:15px}
  .tab .bar{margin-top:8px}
  .stage{align-self:center;max-width:none;max-height:none;width:calc(100% - 20px);justify-self:start}
  .device{padding:5px;border-radius:14px;border-width:1px;box-shadow:8px 8px 0 var(--paper-2),8px 8px 0 1px var(--ink)}
  .device img{inset:5px;width:calc(100% - 10px);height:calc(100% - 10px);border-radius:9px}
  .phone{padding:3px;border-radius:17px;border-width:1px;right:-10px;bottom:-22px;box-shadow:5px 5px 0 var(--accent)}
  .phone img{border-radius:14px}
  .hero,.show,.dl,.sh{grid-template-columns:minmax(0,1fr)}
  h1 em{white-space:normal}
  .ctas .btn{flex:1 1 auto;justify-content:center}
  .sh{padding:36px 24px}
  .features,.grid2{grid-template-columns:1fr}
  .prin,.prin:nth-child(even){padding:28px 0;border-left:0}
  nav .links{display:none}
  nav{padding:0 20px}
  nav .wrap{gap:16px}
  nav.scrolled .wrap{padding:0 16px}
  nav .gh{margin-left:auto}
  nav .gh span{display:none}
  .film{grid-template-columns:minmax(0,1fr);gap:36px;justify-items:center}
  .film-copy{justify-self:stretch}
  .phone{right:-6px}
  .dl{padding:48px 28px}
  footer{padding:36px 0 calc(40px + env(safe-area-inset-bottom));color:var(--ink-2)}
  footer .wrap{flex-direction:column;align-items:flex-start;gap:14px}
  footer .r{margin-left:0}
  #download{padding-bottom:24px}
  .hero{padding-top:40px;gap:48px}
  .demo{transform:none;box-shadow:6px 6px 0 var(--ink)}
  .feed{height:300px}
  .chips{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin:0 -14px;padding:0 14px}
  .chips::-webkit-scrollbar{display:none}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}}

/* document pages (privacy, support, changelog) */
.doc{max-width:720px;padding-top:56px;padding-bottom:40px}
.doc h1{font:600 clamp(34px,4.4vw,46px)/1.1 var(--serif);letter-spacing:-.02em;margin:0 0 10px}
.doc .updated{margin:0 0 36px;font:500 12px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3)}
.doc .lead{margin:0 0 36px;font-size:19px;color:var(--ink-2)}
.doc h2{font:600 22px/1.3 var(--serif);letter-spacing:-.01em;margin:44px 0 12px;padding-top:24px;border-top:1px solid var(--rule);max-width:none}
.doc p,.doc ul{margin:0 0 14px;color:var(--ink-2)}
.doc ul{padding-left:22px}
.doc li{margin-bottom:6px}
.doc a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:3px;overflow-wrap:anywhere}