:root{font-family:Helvetica,Arial,sans-serif;font-size:16px;line-height:1.62;--sidebar:285px;--max:980px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--fg)}
a{color:var(--link);text-decoration:none}a:hover{text-decoration:underline}
.topbar{position:sticky;top:0;z-index:20;height:58px;border-bottom:1px solid var(--border);background:var(--top);display:flex;align-items:center;gap:18px;padding:0 20px}
.brand{font-weight:800;letter-spacing:.08em;color:var(--fg);white-space:nowrap}.brand small{font-weight:400;letter-spacing:0;color:var(--muted);margin-left:8px}
.top-spacer{flex:1}.switches{display:flex;gap:7px;align-items:center;flex-wrap:wrap}.switches a{border:1px solid var(--border);border-radius:7px;padding:4px 8px;font-size:12px;color:var(--muted)}.switches a.active{color:var(--fg);background:var(--accent-soft)}
.shell{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);min-height:calc(100vh - 58px)}
.sidebar{position:sticky;top:58px;height:calc(100vh - 58px);overflow:auto;border-right:1px solid var(--border);padding:22px 16px;background:var(--side)}
.sidebar .group{font-size:11px;text-transform:uppercase;letter-spacing:.14em;color:var(--faint);margin:18px 10px 8px}.sidebar a{display:block;padding:7px 10px;border-radius:7px;color:var(--muted);font-size:14px}.sidebar a.active{background:var(--accent-soft);color:var(--fg);font-weight:700}.sidebar a:hover{background:var(--hover);text-decoration:none;color:var(--fg)}
main{width:100%;max-width:var(--max);padding:48px 54px 90px;margin:0 auto}.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:700}.lead{font-size:20px;line-height:1.5;color:var(--muted);max-width:780px}h1{font-size:46px;line-height:1.05;letter-spacing:-.035em;margin:8px 0 18px}h2{font-size:30px;line-height:1.2;margin:54px 0 14px;letter-spacing:-.02em}h3{font-size:21px;margin:35px 0 10px}p{margin:12px 0;color:var(--text)}strong{color:var(--fg)}code:not(.axiom){font-family:ui-monospace,SFMono-Regular,Consolas,monospace;background:var(--inline);padding:.12em .34em;border-radius:4px;color:var(--code-inline)}
.note,.warning,.status,.idea{border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:8px;padding:13px 16px;margin:20px 0;background:var(--panel)}.warning{border-left-color:#ffb020}.status{border-left-color:#8a7dff}.idea{border-left-color:#47c98b}.note b,.warning b,.status b,.idea b{display:block;margin-bottom:3px}
.code-card{border:1px solid var(--border);border-radius:10px;overflow:hidden;margin:20px 0;background:var(--code-bg)}.code-head{display:flex;justify-content:space-between;gap:15px;padding:9px 13px;border-bottom:1px solid var(--border);font-size:12px;color:var(--faint);background:var(--code-head)}.code-head b{color:var(--muted)}
pre{margin:0;overflow:auto;padding:13px 0;background:var(--code-bg)}code.axiom{display:block;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:14px;line-height:1.62;tab-size:4}.axiom-line{display:grid;grid-template-columns:48px minmax(max-content,1fr);min-height:1.62em;padding-right:18px}.axiom-line:hover{background:var(--code-hover)}.ln{user-select:none;text-align:right;padding-right:14px;color:var(--line-no);border-right:1px solid var(--border)}.src{padding-left:14px;white-space:pre}
.walk{margin:18px 0 30px;border-left:1px solid var(--border);padding-left:18px}.walk-row{display:grid;grid-template-columns:52px 1fr;gap:10px;padding:7px 0}.walk-row .n{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--accent);font-size:13px}.walk-row p{margin:0;color:var(--muted)}
.kw{color:var(--syn-key)}.type{color:var(--syn-type)}.num{color:var(--syn-num)}.str{color:var(--syn-str)}.com{color:var(--syn-com)}.builtin{color:var(--syn-bi)}.variant{color:var(--syn-var)}.op{color:var(--syn-op)}
.table-wrap{overflow:auto;border:1px solid var(--border);border-radius:9px;margin:18px 0}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:top}th{color:var(--fg);background:var(--panel)}td{color:var(--muted)}tr:last-child td{border-bottom:0}
ul,ol{color:var(--text)}li{margin:6px 0}.nextprev{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:70px;padding-top:22px;border-top:1px solid var(--border)}.nextprev a{border:1px solid var(--border);border-radius:9px;padding:13px 15px;color:var(--muted)}.nextprev a:hover{text-decoration:none;background:var(--hover);color:var(--fg)}.nextprev .r{text-align:right}
.hero-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:28px 0}.card{border:1px solid var(--border);background:var(--panel);border-radius:10px;padding:18px}.card h3{margin:0 0 8px;font-size:17px}.card p{font-size:14px;color:var(--muted);margin:0}.badge{display:inline-block;border:1px solid var(--border);border-radius:999px;padding:2px 8px;font-size:11px;color:var(--muted);margin-left:6px;vertical-align:middle}.kbd{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;border:1px solid var(--border);border-bottom-width:2px;border-radius:5px;padding:1px 5px;background:var(--panel);font-size:12px}
.selector-body{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:28px;background:var(--bg)}.selector{width:min(920px,100%);border:1px solid var(--border);border-radius:14px;padding:34px;background:var(--panel)}.selector h1{font-size:40px}.choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:28px}.choice-block h2{font-size:20px;margin:0 0 10px}.choice-links{display:grid;gap:8px}.choice-links a{display:flex;justify-content:space-between;border:1px solid var(--border);border-radius:8px;padding:11px 13px;background:var(--bg);color:var(--fg)}
.footer{margin-top:50px;color:var(--faint);font-size:12px}
@media(max-width:900px){.shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--border);display:grid;grid-template-columns:repeat(2,1fr)}main{padding:35px 24px 70px}.hero-grid{grid-template-columns:1fr}.topbar{height:auto;min-height:58px;padding:10px 14px;align-items:flex-start}.shell{min-height:0}.choice-grid{grid-template-columns:1fr}.sidebar .group{grid-column:1/-1}.sidebar a{font-size:13px}}
@media(max-width:540px){h1{font-size:36px}.lead{font-size:18px}.sidebar{grid-template-columns:1fr}.switches{justify-content:flex-end}.brand small{display:none}.walk-row{grid-template-columns:40px 1fr}.axiom-line{grid-template-columns:42px minmax(max-content,1fr)}main{padding-left:18px;padding-right:18px}}