:root{--bg:#f8fafc;--text:#0f172a;--muted:#475569;--border:#e2e8f0;--card:#fff;--btn:#0f172a;--accent:#f43f5e;--accent-text:#be123c;--code:#f1f5f9}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5rem}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:inherit;text-underline-offset:3px}
:focus-visible{outline:3px solid #2563eb;outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--btn);color:#fff;padding:.75rem 1rem;z-index:30}
.skip:focus{left:0}
.topbar{position:sticky;top:0;z-index:20;background:var(--card);border-bottom:1px solid var(--border)}
.topbar .in{display:flex;align-items:center;gap:.5rem 1.25rem;flex-wrap:wrap;max-width:76rem;margin:0 auto;padding:.4rem 1rem}
.brand{display:inline-flex;align-items:center;gap:.4rem;font-weight:700;font-size:1.0625rem;letter-spacing:-.025em;color:var(--text);text-decoration:none;min-height:44px}
.brand svg{width:1.5rem;height:1.5rem;flex:none}
.brandline{display:inline-flex;align-items:center;gap:.65rem}
.brandline .sub{display:inline-flex;align-items:center;min-height:44px;padding-left:.65rem;border-left:1px solid var(--border);font-weight:500;font-size:1.0625rem;letter-spacing:-.025em;color:var(--muted);text-decoration:none}
.brandline .sub:hover{color:var(--text)}
.toplinks{display:flex;flex-wrap:wrap;gap:0 .25rem;margin-left:auto;align-items:center}
.toplinks a{display:inline-flex;align-items:center;min-height:44px;padding:0 .6rem;color:var(--muted);text-decoration:none;font-size:.875rem}
.toplinks a:hover{color:var(--text)}
.lang{display:inline-flex;border:1px solid #cbd5e1;border-radius:.375rem;overflow:hidden;margin-left:.5rem}
.lang a{min-height:36px;padding:0 .6rem;color:var(--muted);font-size:.8125rem;font-weight:600;text-decoration:none;display:inline-flex;align-items:center}
.lang a[aria-current="true"]{background:var(--btn);color:#fff}
.shell{display:grid;gap:1.5rem;max-width:76rem;margin:0 auto;padding:1.25rem 1rem 3rem}
@media(min-width:60rem){.shell{grid-template-columns:15.5rem minmax(0,1fr);gap:2.5rem}}
nav.side details{border:1px solid var(--border);border-radius:.5rem;background:var(--card);padding:.25rem .75rem}
nav.side summary{min-height:44px;display:flex;align-items:center;font-weight:600;cursor:pointer}
@media(min-width:60rem){nav.side{position:sticky;top:4.25rem;align-self:start;max-height:calc(100vh - 5rem);overflow:auto}nav.side details{border:0;background:none;padding:0}nav.side summary{display:none}}
nav.side h2{font-size:.6875rem;letter-spacing:.1em;text-transform:uppercase;color:#64748b;margin:1rem 0 .25rem}
nav.side ul{list-style:none;margin:0;padding:0}
nav.side a{display:block;padding:.3rem .6rem;border-radius:.375rem;color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:400}
nav.side a:hover{background:#eef2f7;color:var(--text)}
nav.side a[aria-current="page"]{background:var(--btn);color:#fff;font-weight:700}
main{min-width:0}
.crumb{font-size:.75rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:#64748b;margin:0 0 .5rem}
h1{font-size:2rem;line-height:1.2;margin:0 0 .75rem;letter-spacing:-.02em}
h2{font-size:1.375rem;line-height:1.3;margin:2.25rem 0 .75rem;letter-spacing:-.01em}
h3{font-size:1.0625rem;margin:0 0 .4rem}
p{margin:0 0 1rem}
.lead{font-size:1.125rem;color:var(--muted)}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;background:var(--code);padding:.1em .3em;border-radius:.25rem}
ul,ol{margin:0 0 1rem;padding-left:1.25rem}
li{margin:0 0 .4rem}
.where{display:flex;flex-wrap:wrap;gap:.25rem 1.25rem;font-size:.875rem;color:var(--muted);margin:0 0 1.5rem}
.where b{color:var(--text);font-weight:600}
figure.window{margin:1.25rem 0;border:1px solid #cbd5e1;border-radius:.75rem;overflow:hidden;background:var(--card);box-shadow:0 1px 3px rgba(15,23,42,.08)}
figure.window .bar{display:flex;align-items:center;gap:.5rem;padding:.45rem .75rem;background:#f1f5f9;border-bottom:1px solid var(--border);font-size:.75rem;color:var(--muted)}
figure.window .dots{display:inline-flex;gap:.3rem}
figure.window .dots i{width:.6rem;height:.6rem;border-radius:50%;background:#cbd5e1}
figure.window .url{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;background:var(--card);border:1px solid var(--border);border-radius:.375rem;padding:.1rem .5rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
figure.window iframe{display:block;width:100%;height:40rem;border:0;background:#f8fafc}
figure.window figcaption{padding:.6rem .9rem;font-size:.875rem;color:var(--muted);border-top:1px solid var(--border)}
ol.parts{list-style:none;padding:0;margin:1rem 0 0;display:grid;gap:.75rem}
ol.parts>li{margin:0;background:var(--card);border:1px solid var(--border);border-radius:.75rem;padding:.9rem 1rem 1rem 3.25rem;position:relative}
ol.parts>li:target{border-color:var(--accent)}
ol.parts>li::before{content:attr(data-n);position:absolute;left:.9rem;top:.85rem;min-width:1.5rem;height:1.5rem;padding:0 .3rem;border-radius:999px;background:var(--accent);color:#fff;font:700 .8rem/1.5rem system-ui;text-align:center}
ol.parts p,ol.parts ul{color:var(--muted);font-size:.9375rem;margin:0 0 .6rem}
ol.parts>li>*:last-child{margin-bottom:0}
ol.parts h3 a{text-decoration:none}
ol.steps{list-style:none;padding:0;margin:0;display:grid;gap:.75rem;counter-reset:s}
ol.steps li{counter-increment:s;background:var(--card);border:1px solid var(--border);border-radius:.75rem;padding:.9rem 1rem .9rem 3.25rem;position:relative;margin:0}
ol.steps li::before{content:counter(s);position:absolute;left:.9rem;top:.85rem;width:1.75rem;height:1.75rem;border-radius:50%;background:var(--btn);color:#fff;font-weight:700;font-size:.875rem;display:flex;align-items:center;justify-content:center}
ol.steps p{margin:0;color:var(--muted);font-size:.9375rem}
.callout{border:1px solid var(--border);border-left:4px solid var(--accent);background:var(--card);border-radius:.5rem;padding:.75rem 1rem;margin:0 0 1rem}
.callout h3{font-size:.9375rem}
.callout ul{margin:0}
.demo{margin:1rem 0;border:1px solid #cbd5e1;border-radius:.75rem;overflow:hidden;background:var(--card)}
.demo iframe{display:block;width:100%;height:36rem;border:0}
.demo p{margin:0;padding:.6rem .9rem;font-size:.8125rem;color:var(--muted);border-top:1px solid var(--border)}
.related{display:flex;flex-wrap:wrap;gap:.5rem;list-style:none;padding:0;margin:0}
.related li{margin:0}
.related a{display:inline-flex;align-items:center;min-height:44px;padding:0 .9rem;border:1px solid #cbd5e1;border-radius:.375rem;background:var(--card);text-decoration:none;font-size:.9375rem}
.related a:hover{background:var(--border)}
.feedback{margin:2.5rem 0 1rem;padding:1rem 1.25rem;background:var(--card);border:1px solid var(--border);border-radius:.75rem;display:flex;flex-wrap:wrap;align-items:center;gap:.75rem 1rem}
.feedback p{margin:0;font-weight:600}
.feedback .btns{display:flex;gap:.5rem}
.feedback button{min-height:44px;min-width:5.5rem;padding:0 1rem;border:1px solid #cbd5e1;border-radius:.375rem;background:var(--card);color:var(--text);font:inherit;cursor:pointer}
.feedback button:hover{background:var(--border)}
.feedback button[aria-pressed="true"]{background:var(--btn);color:#fff;border-color:var(--btn)}
.feedback .thanks{font-weight:400;color:var(--muted)}
.pager{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.75rem;margin:1.5rem 0 0}
.pager a{display:inline-flex;flex-direction:column;min-height:44px;padding:.5rem .9rem;border:1px solid var(--border);border-radius:.5rem;background:var(--card);text-decoration:none;font-size:.9375rem;max-width:100%}
.pager a small{font-size:.6875rem;letter-spacing:.08em;text-transform:uppercase;color:#64748b}
.pager a:hover{border-color:#94a3b8}
.cards{display:grid;gap:.75rem;grid-template-columns:repeat(auto-fill,minmax(15rem,1fr));margin:0 0 1rem;padding:0;list-style:none}
.cards li{margin:0}
.cards a{display:block;height:100%;padding:.9rem 1rem;background:var(--card);border:1px solid var(--border);border-radius:.75rem;text-decoration:none}
.cards a:hover{border-color:#94a3b8}
.cards strong{display:block;margin-bottom:.2rem}
.cards span{color:var(--muted);font-size:.875rem}
footer.site{border-top:1px solid var(--border);background:var(--card);padding:1.5rem 0;font-size:.875rem;color:var(--muted)}
footer.site .in{max-width:76rem;margin:0 auto;padding:0 1rem}
footer.site p{margin:0 0 .6rem}
footer.site a{display:inline-block;padding:.5rem 0;margin-right:1rem}
.chooser{max-width:40rem;margin:4rem auto;padding:0 1rem}
.chooser .cards{grid-template-columns:repeat(2,1fr)}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.topbar,nav.side,.feedback,.demo,.pager{display:none}.shell{display:block}}