:root{--sky:#B3E5FC;--ch:#424242;--pop:#FFD54F;--line:#cfe3ee;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth;height:100%}
body{margin:0;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:#000;background:#fff;padding-top:env(safe-area-inset-top);padding-bottom:env(safe-area-inset-bottom)}
a{color:#000;text-decoration-color:#4fb3e8;text-underline-offset:3px}a:hover{background:var(--sky)}
:focus-visible{outline:3px solid #0b6fa4;outline-offset:2px}
.wrap{max-width:1120px;margin:auto;padding:0 20px}
h1,h2,h3{line-height:1.15;margin:0 0 .5em}h1{font-size:clamp(2rem,5.5vw,3.4rem);letter-spacing:-.02em}h2{font-size:clamp(1.5rem,3.5vw,2.1rem)}h3{font-size:1.15rem}
p{margin:0 0 1em}.mono{font-family:var(--mono)}
header{background:var(--ch);position:sticky;top:0;z-index:20}
.bar{display:flex;align-items:center;gap:18px;min-height:62px}
.logo{display:flex;align-items:center;gap:10px;color:var(--sky);font:800 21px var(--mono);text-decoration:none;letter-spacing:.04em}.logo:hover{background:none}
nav{margin-left:auto;display:flex;gap:4px;align-items:center}
nav a{color:#fff;text-decoration:none;padding:8px 12px;border-radius:4px;font-size:15px;font-weight:600}
nav a:hover,nav a[aria-current=page]{background:var(--sky);color:#000}
nav a.cta{background:var(--sky);color:#000;margin-left:6px}nav a.cta:hover{background:#fff}
#mb{display:none;margin-left:auto;background:none;border:2px solid var(--sky);color:var(--sky);border-radius:4px;padding:6px 12px;font:700 14px var(--mono);cursor:pointer}
@media(max-width:820px){#mb{display:block}nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--ch);flex-direction:column;align-items:stretch;padding:8px 20px 16px;border-top:1px solid #666}nav.open{display:flex}nav a{padding:12px}}
.btn{display:inline-block;border:2px solid var(--ch);background:var(--ch);color:#fff;font:700 16px/1 system-ui,sans-serif;padding:14px 22px;border-radius:4px;cursor:pointer;text-decoration:none;box-shadow:4px 4px 0 var(--sky);transition:transform .15s,box-shadow .15s}
.btn:hover{background:var(--ch);color:#fff;transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--sky)}.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--sky)}
.btn.alt{background:#fff;color:#000}.btn.alt:hover{background:var(--sky);color:#000}
.sm{padding:8px 12px;font-size:14px;box-shadow:2px 2px 0 var(--sky)}
.card{border:2px solid var(--ch);border-radius:6px;background:#fff;padding:20px;box-shadow:5px 5px 0 var(--sky)}
a.card{display:block;text-decoration:none;transition:transform .15s,box-shadow .15s}a.card:hover{background:#fff;transform:translate(-2px,-2px);box-shadow:8px 8px 0 var(--sky)}
.grid{display:grid;gap:22px}.g3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.g5{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}
section{padding:56px 0}.band{background:var(--sky)}.dark{background:var(--ch);color:#fff}.dark a{color:#fff}
.eyebrow{font:700 13px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:#2a6f94;margin-bottom:10px}
.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;padding:56px 0}
@media(max-width:820px){.hero{grid-template-columns:1fr;padding:36px 0}}
.lead{font-size:1.2rem;max-width:34em}
.stack{background:var(--ch);color:#fff;border-radius:8px;padding:22px;box-shadow:8px 8px 0 var(--sky)}
.stack .row{display:flex;justify-content:space-between;align-items:center;background:#555;border-left:5px solid var(--sky);padding:12px 14px;margin-bottom:10px;font:700 18px var(--mono);animation:fl 4s ease-in-out infinite}
.stack .row:nth-child(3){animation-delay:.6s}.stack .row:nth-child(4){animation-delay:1.2s}
.stack small{font:12px system-ui;color:#cfd8dc;display:block;margin-top:12px}.lv{font-size:12px;color:var(--sky)}
@keyframes fl{50%{transform:translateX(6px)}}
.anat{display:flex;flex-wrap:wrap;gap:10px;align-items:stretch;justify-content:center;margin:24px 0}
.blk{flex:1 1 150px;max-width:220px;text-align:center;border:2px solid var(--ch);background:#fff;border-radius:6px;padding:14px 10px;position:relative}
.blk b{display:block;font:800 26px var(--mono)}.blk span{font-size:14px;color:#333}.blk i{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--ch);color:var(--sky);font:700 11px var(--mono);padding:2px 8px;border-radius:3px;font-style:normal}
.plus{align-self:center;font:800 28px var(--mono)}
.res{text-align:center;font:800 clamp(1.6rem,5vw,2.6rem) var(--mono);background:var(--ch);color:var(--sky);padding:14px;border-radius:6px}
.bars .b{display:grid;grid-template-columns:110px 1fr 40px;gap:12px;align-items:center;margin:12px 0;font-weight:600}
.bars .t{height:22px;background:#fff;border:2px solid var(--ch);border-radius:3px;overflow:hidden}
.bars .f{height:100%;background:var(--ch);width:0;transition:width 1s cubic-bezier(.2,.8,.2,1)}.in .f{width:var(--w)}
.steps{counter-reset:s}.step{position:relative;padding-top:48px}.step:before{counter-increment:s;content:"0" counter(s);position:absolute;top:10px;left:20px;font:800 30px var(--mono);color:#7ab8d6}
.pips{display:flex;gap:4px;margin-top:8px}.pips u{width:16px;height:8px;background:var(--line);border:1px solid var(--ch)}.pips u.on{background:var(--ch)}
.tile b{font-size:1.1rem}.tile .ex{font:14px var(--mono);color:#2a6f94;display:block}.tile small{font-size:12px;color:#444}
table{border-collapse:collapse;width:100%;min-width:560px}th,td{border:2px solid var(--ch);padding:10px 12px;text-align:left;vertical-align:top}th{background:var(--ch);color:#fff}
.tw{overflow-x:auto;max-width:100%}
details{border:2px solid var(--ch);border-radius:6px;margin-bottom:12px;background:#fff}summary{cursor:pointer;padding:14px 18px;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:10px}summary:after{content:"+";font:800 20px var(--mono)}details[open] summary:after{content:"–"}details p{padding:0 18px;margin-bottom:16px}
.crumbs{font-size:14px;padding:16px 0 0}.crumbs a{text-decoration:none}.crumbs a:hover{text-decoration:underline;background:none}
.panel{background:#fff;border:2px solid var(--ch);border-radius:8px;box-shadow:8px 8px 0 var(--sky);padding:24px;margin:20px 0}
.ctl{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin:16px 0}
label,.lab{font-weight:700;font-size:14px;display:block;margin-bottom:5px}
input[type=text],select{width:100%;font:16px system-ui;padding:11px;border:2px solid var(--ch);border-radius:4px;background:#fff;color:#000}
.hint{font-size:13px;color:#444;margin-top:4px}
.chips{display:flex;flex-wrap:wrap;gap:8px;border:0;padding:0;margin:14px 0}.chips legend{font-weight:700;font-size:14px;margin-bottom:8px;padding:0}
.chips input{position:absolute;opacity:0}.chips label{margin:0;padding:8px 14px;border:2px solid var(--ch);border-radius:99px;cursor:pointer;font-weight:600;font-size:14px}
.chips input:checked+span{background:var(--ch);color:var(--sky)}.chips label:has(input:checked){background:var(--ch);color:var(--sky)}.chips label:has(input:focus-visible){outline:3px solid #0b6fa4}
.out{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:12px;margin-top:18px}
.nm{display:flex;align-items:center;gap:8px;border:2px solid var(--ch);border-left:8px solid var(--ch);border-radius:4px;padding:10px;background:#fff;animation:pop .25s both}
.nm code{flex:1;font:800 18px var(--mono);overflow-wrap:anywhere}.nm em{font:12px var(--mono);font-style:normal;background:var(--sky);padding:2px 6px;border-radius:3px}.nm em.bad{background:#ffb4a8}
.nm .sv[aria-pressed=true]{background:var(--pop);color:#000}
@keyframes pop{from{opacity:0;transform:translateY(6px)}}
.fav{background:#f2fafe;border:2px dashed var(--ch);border-radius:6px;padding:16px;margin-top:20px}.fav .out{margin-top:10px}
.av{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}
#st{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ch);color:#fff;padding:10px 18px;border-radius:99px;font-weight:600;opacity:0;transition:opacity .2s;pointer-events:none;z-index:50}#st.on{opacity:1}
footer{background:var(--ch);color:#e6e6e6;padding:48px 0 24px;font-size:15px}footer a{color:var(--sky);text-decoration:none}footer a:hover{background:none;text-decoration:underline}
.fg{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}@media(max-width:820px){.fg{grid-template-columns:1fr 1fr}}@media(max-width:520px){.fg{grid-template-columns:1fr}}
footer h3{color:#fff;font-size:15px;letter-spacing:.08em;text-transform:uppercase}footer ul{list-style:none;padding:0;margin:0}footer li{margin:7px 0}.copy{border-top:1px solid #666;margin-top:30px;padding-top:16px;font-size:13px}
.rv{opacity:0;transform:translateY(14px);transition:opacity .5s,transform .5s}.rv.in{opacity:1;transform:none}
.prose{max-width:760px}.prose ul{padding-left:20px}
@media(max-width:560px){.bars .b{grid-template-columns:84px 1fr 30px;font-size:14px}.panel{padding:16px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto}.rv{opacity:1;transform:none}.bars .f{width:var(--w)}}

body{overflow-x:clip}.logo{letter-spacing:.02em}@media(max-width:520px){.logo{font-size:15px}}

.toc{border:2px solid var(--ch);background:#f2fafe;border-radius:6px;padding:14px 20px;margin:18px 0}.toc ul{margin:8px 0 0}.meta{font-size:14px;color:#444}.chips a:hover{background:none}article h2{margin-top:1.6em}article ul{padding-left:22px}