:root{--ink:#111;--bg:#f7f7f5;--bg-2:#ededeb;--surface:rgba(255,255,255,.88);--muted:#696969;--line:rgba(17,17,17,.14);--soft:rgba(17,17,17,.07);--on-ink:#fff;--success:hsl(142 71% 34%);--grid:rgba(0,0,0,.04);
--sans:ui-sans-serif,system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;--mono:ui-monospace,"IBM Plex Mono",SFMono-Regular,Menlo,Consolas,"Noto Sans Mono CJK SC",monospace;--ease:cubic-bezier(.2,.7,.2,1)}
@media (prefers-color-scheme:dark){:root{--ink:#f5f5f5;--bg:#050505;--bg-2:#111;--surface:rgba(18,18,18,.86);--muted:#a3a3a3;--line:rgba(255,255,255,.14);--soft:rgba(255,255,255,.08);--on-ink:#0a0a0a;--success:hsl(142 69% 58%);--grid:rgba(255,255,255,.05)}}
*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth}body{margin:0;font:15px/1.65 var(--sans);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}code,.mono{font-family:var(--mono);font-size:.88em}
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:12px;height:58px;padding:0 20px;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.wordmark{font-weight:850;font-size:22px;letter-spacing:-.05em}.nav{display:flex;gap:2px}.nav a{color:var(--muted);font-weight:600;padding:6px 10px;border-radius:9px;transition:background-color .16s ease,color .16s ease}.nav a:hover{color:var(--ink);background:var(--soft)}.spacer{flex:1}
.btn{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 18px;border-radius:12px;font:inherit;font-weight:650;border:1px solid transparent;background:none;color:inherit;cursor:pointer;transition:opacity .16s ease,background-color .16s ease}.btn.small{height:34px;padding:0 14px;font-size:14px}
.primary{background:var(--ink);color:var(--on-ink)}.primary:hover{opacity:.88}.outline{border-color:var(--line);background:var(--surface)}.outline:hover{background:var(--soft)}.btn:disabled{opacity:.5;cursor:default}.btn.wide{width:100%}
:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
main{max-width:1120px;margin:0 auto;padding:0 20px}
.hero{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;min-height:calc((100vh - 58px) * .79);padding:48px 0;position:relative;isolation:isolate}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:32px 32px;-webkit-mask-image:linear-gradient(#000 70%,transparent);mask-image:linear-gradient(#000 70%,transparent)}
.kicker{margin:0 0 14px;font-size:12px;font-weight:700;letter-spacing:.08em;color:var(--muted)}
h1{margin:0;font-size:clamp(2rem,4.2vw,3.3rem);line-height:1.12;font-weight:820;letter-spacing:-.035em}
.lead{margin:18px 0 26px;font-size:17px;color:var(--muted);max-width:30em}.cta{display:flex;gap:10px;flex-wrap:wrap}.note{margin:14px 0 0;font-size:13px;color:var(--muted)}
.ink{border-radius:18px;background:linear-gradient(180deg,#171717,#111);color:#e8e8e6;border:1px solid rgba(255,255,255,.06);box-shadow:0 14px 40px rgba(0,0,0,.12);overflow:hidden}
.ink-bar{display:flex;align-items:center;gap:6px;padding:12px 14px;border-bottom:1px solid rgba(255,255,255,.07)}.ink-bar span{width:9px;height:9px;border-radius:50%;background:#3a3a3a}.ink-bar em{margin-left:8px;font:12px var(--mono);font-style:normal;color:#8a8a8a}
.ink pre{margin:0;padding:18px 20px;font:13.5px/1.7 var(--mono);overflow-x:auto}.ink b{color:#fff;font-weight:600}
.ink-term{padding:14px 20px;border-top:1px solid rgba(255,255,255,.07);font:13px/1.8 var(--mono);color:#cfcfcf;overflow-wrap:anywhere}.dim{color:#7a7a7a}.ok{color:#4ade80}
.sec{padding:72px 0;border-top:1px solid var(--line)}.sec h2{margin:0 0 28px;font-size:clamp(24px,3vw,36px);font-weight:720;letter-spacing:-.025em}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.two{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:22px}.card h3{margin:10px 0 6px;font-size:18px}.card p{margin:0;color:var(--muted)}.two .card h3{margin-top:0}.card ul{margin:0;padding-left:18px;color:var(--muted)}
.tag{display:inline-flex;height:24px;align-items:center;padding:0 10px;border-radius:999px;font-size:12px;font-weight:650;background:var(--ink);color:var(--on-ink)}.tag.dim{background:var(--soft);color:var(--muted)}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:12px;counter-reset:s}.steps li{counter-increment:s;display:grid;grid-template-columns:40px 1fr;column-gap:12px;padding:18px 20px;background:var(--surface);border:1px solid var(--line);border-radius:18px}
.steps li::before{content:counter(s);grid-row:span 2;width:32px;height:32px;border-radius:999px;display:grid;place-items:center;background:var(--soft);font-weight:700}.steps .mono{font-weight:600;overflow-wrap:anywhere}.steps p{margin:2px 0 0;color:var(--muted)}
.end{text-align:center}.end h2{margin-bottom:20px}
.foot{max-width:1120px;margin:0 auto;padding:28px 20px 40px;display:flex;justify-content:space-between;color:var(--muted);font-size:13px;border-top:1px solid var(--line)}.foot a:hover{color:var(--ink)}
.js .reveal{opacity:0;transform:translateY(12px);transition:opacity .45s var(--ease),transform .45s var(--ease)}.js .reveal.in{opacity:1;transform:none}
.authed-only{display:none!important}.authed .authed-only{display:inline-flex!important}.authed .anon-only{display:none!important}
/* login modal */
.login-scrim{position:fixed;inset:0;z-index:40;display:grid;place-items:center;padding:20px;background:rgba(17,17,17,.34);backdrop-filter:blur(6px)}
.login-dialog{--ink:#111;--muted:#696969;--line:rgba(17,17,17,.14);--soft:rgba(17,17,17,.07);--bg:#f7f7f5;--on-ink:#fff;--surface:#fff;color:#111;opacity:1;-webkit-backdrop-filter:none;backdrop-filter:none;position:relative;width:100%;max-width:400px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 14px 40px rgba(0,0,0,.18);padding:26px}
.login-close{position:absolute;top:10px;right:12px;width:32px;height:32px;border:0;border-radius:9px;background:none;color:var(--muted);font:inherit;font-size:22px;line-height:1;cursor:pointer}.login-close:hover{background:var(--soft);color:var(--ink)}
.logincard{display:grid;gap:14px}.logincard h2{margin:0;font-size:24px;font-weight:780;letter-spacing:-.02em}.logincard .muted{margin:-6px 0 2px;color:var(--muted);font-size:14px;overflow-wrap:anywhere}
.logincard label{display:grid;gap:6px;font-size:13px;font-weight:600}
.logincard input{font:inherit;color:inherit;width:100%;height:40px;border:1px solid var(--line);background:var(--bg);border-radius:12px;padding:8px 12px;outline:none;transition:border-color .16s ease}.logincard input:focus{border-color:var(--ink)}
.formerr{margin:0;font-size:13px;font-weight:600}.formerr:empty{display:none}
.textbtn{background:none;border:0;color:var(--muted);font:inherit;font-size:13px;cursor:pointer;justify-self:center;padding:4px}.textbtn:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}
.authed-card{display:none!important}.authed .authed-card{display:grid!important}.authed #lf{display:none!important}
body.login-open{overflow:hidden}
@media (max-width:860px){.hero{grid-template-columns:1fr;gap:28px;min-height:0;padding:36px 0 48px}.grid3,.two{grid-template-columns:1fr}.nav{display:none}.sec{padding:52px 0}.lead{font-size:16px}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.js .reveal{opacity:1;transform:none;transition:none}*{transition:none!important}}