:root{--ink:#1F2A44;--paper:#EEF1F6;--line:#D5DAE5;--blue:#2F5BEA;--muted:#566581;color-scheme:light}
*{box-sizing:border-box}
body{margin:0;font:17px/1.6 Figtree,system-ui,sans-serif;color:var(--ink);background:var(--paper)}
a{color:var(--blue)}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.25rem;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
nav{display:flex;align-items:center;gap:20px;font-weight:600;font-size:.95rem}
nav a:not(.btn){color:var(--ink);text-decoration:none}
nav a:not(.btn):hover{color:var(--blue)}
.btn{display:inline-block;background:var(--blue);color:#fff;font-weight:700;text-decoration:none;padding:10px 18px;border-radius:10px}
.btn:hover{background:#2449C0}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{background:#F8FAFC}
a:focus-visible,summary:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:6px}
.hero{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding:40px 0 64px}
h1{font-size:clamp(2.1rem,5vw,3.3rem);line-height:1.1;letter-spacing:-.025em;margin:0 0 16px}
.lead{font-size:1.15rem;color:var(--muted);margin:0 0 24px;max-width:34rem}
.cta{display:flex;flex-wrap:wrap;gap:12px}
.canvas{background:#EEF1F6 radial-gradient(#C5CCDA 1.2px,transparent 1.2px) 0 0/18px 18px;border:1px solid var(--line);border-radius:20px;padding:14px}
.canvas svg{display:block;width:100%;height:auto}
section{padding:48px 0}
h2{font-size:clamp(1.5rem,3vw,2rem);letter-spacing:-.02em;margin:0 0 8px}
.sub{color:var(--muted);margin:0 0 28px;max-width:40rem}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px}
.card h3{margin:0 0 6px;font-size:1.05rem}
.card p{margin:0;color:var(--muted);font-size:.97rem}
.num{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;font-size:.9rem;margin-bottom:10px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:stretch}
pre{margin:0;background:#1F2A44;color:#E6EBF5;border-radius:16px;padding:20px;overflow-x:auto;font:13.5px/1.6 "JetBrains Mono",ui-monospace,monospace}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
summary{cursor:pointer;font-weight:700}
details p{margin:10px 0 0;color:var(--muted)}
.final{text-align:center;padding:56px 0}
footer{border-top:1px solid var(--line);padding:24px 0 40px;color:var(--muted);font-size:.9rem;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between}
footer a{color:var(--muted)}
@media(max-width:860px){.hero,.split{grid-template-columns:1fr}.hero{padding-top:16px}nav a.hide{display:none}}
a.card{display:block;text-decoration:none;color:inherit}
a.card:hover{border-color:var(--blue)}
h1.page{font-size:clamp(1.9rem,4.5vw,2.8rem);line-height:1.15;letter-spacing:-.02em;margin:8px 0 12px}
.crumbs{font-size:.9rem;color:var(--muted);margin-top:8px}
.crumbs a{color:var(--muted)}
.scroll{overflow-x:auto}
ul.plain{margin:0;padding-left:1.2rem}
ul.plain li{margin:8px 0}
code{font:.88em "JetBrains Mono",ui-monospace,monospace;background:#E3E8F2;border-radius:4px;padding:1px 5px}
.codewrap{position:relative}
.codewrap pre code{background:none;padding:0;font-size:inherit}
.copy{position:absolute;top:10px;right:10px;background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:4px 10px;font:600 .85rem Figtree,system-ui,sans-serif;cursor:pointer}
.copy:hover{background:#F1F5F9}
.copy:focus-visible{outline:2px solid var(--blue);outline-offset:2px}

/* learn */
.article{max-width:46rem}
.article h3{margin:28px 0 6px;font-size:1.1rem}
.article p{margin:0 0 14px}
.article .canvas{margin:12px 0 8px}
.toc{display:flex;flex-wrap:wrap;gap:6px 16px;align-items:center;margin-top:24px;padding:12px 16px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:.92rem}
.toc a{color:var(--blue);text-decoration:none}
.toc a:hover{text-decoration:underline}
.card.glyph svg{display:block;margin-bottom:8px;max-width:100%}
.card .tag{font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--blue);margin:0 0 6px}
table.ref{width:100%;border-collapse:collapse;margin-top:20px;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;font-size:.95rem}
table.ref th,table.ref td{padding:10px 14px;text-align:left;border-bottom:1px solid #EEF1F6}
table.ref th{background:#F8FAFC;font-weight:700}
table.ref tr:last-child td{border-bottom:none}
ol.steps{padding-left:1.2rem}
ol.steps li{margin:8px 0}