:root{color-scheme:dark;--bg:#0b1b1c;--panel:#102829;--line:#294243;--ink:#f1efdf;--muted:#a6bbb6;--mint:#a2d7c4;--gold:#e5bc76;--paper:#f1ead7;--paper-ink:#263d39;--paper-muted:#596d61;--rust:#a34e28;--serif:Georgia,'Times New Roman',serif;--sans:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;--mono:ui-monospace,SFMono-Regular,Consolas,monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 var(--sans)}button,input,textarea{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{color:inherit;text-underline-offset:4px}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,div[tabindex]:focus-visible{outline:3px solid var(--gold);outline-offset:4px}button:focus-visible{position:relative;z-index:3}button.node:focus-visible{position:absolute;outline-color:#9d4f29}.skip{position:fixed;left:15px;top:-80px;background:var(--paper);color:var(--bg);padding:10px 20px;z-index:10}.skip:focus{top:10px}.skip:not(:focus){clip-path:inset(50%)}[hidden]{display:none!important}.topbar{max-width:1400px;margin:auto;min-height:80px;padding:20px 48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}.brand{display:flex;gap:12px;align-items:center;font-size:12px;font-weight:750;letter-spacing:.14em;text-decoration:none}.topbar nav{display:flex;gap:28px;font-size:12px;color:var(--muted)}.topbar nav a{text-decoration:none}.topbar nav a:hover{color:var(--ink)}main{max-width:1400px;margin:0 auto;padding:0 48px}.hero{display:grid;grid-template-columns:1.3fr 1fr;gap:70px;align-items:end;padding:55px 0 40px}.eyebrow,.small-label{font-size:10px;letter-spacing:.16em;text-transform:uppercase;font-weight:700}.eyebrow{color:var(--gold);margin:0 0 14px}.tiny-seal{display:inline-block;width:7px;height:7px;background:var(--gold);transform:rotate(45deg);margin-right:8px}h1,h2,h3,p{margin-top:0}h1{font:normal clamp(46px,5.7vw,78px)/1.03 var(--serif);letter-spacing:-.045em;margin-bottom:19px}h1 em,h2 em{font-weight:normal;color:var(--mint)}.tagline{font:22px/1.4 var(--serif);color:#d9dfce;margin-bottom:0}.hero-note{max-width:370px;margin:0 0 5px auto}.archive-number{font:10px var(--mono);letter-spacing:.15em;color:var(--gold)}.hero-note p{font-size:15px;color:var(--muted);margin:17px 0}.hero-meta{font-size:10px;color:var(--muted)}.hero-meta b{margin:0 7px;color:var(--gold)}.toolbar{border-top:1px solid var(--line);padding:20px 0;display:flex;justify-content:space-between;gap:15px;align-items:center}.mode-switch{display:flex;gap:4px;border:1px solid var(--line);padding:4px;border-radius:6px}.mode-switch button{background:transparent;border:0;border-radius:3px;padding:9px 17px;font-size:12px;color:var(--muted)}.mode-switch button[aria-pressed=true]{background:#23423f;color:var(--mint)}.score{color:var(--gold);font:11px var(--mono);text-transform:uppercase}.chapters{display:grid;grid-template-columns:repeat(6,1fr);border-bottom:1px solid var(--line);gap:6px}.chapters button{min-height:54px;padding:12px 8px;border:0;border-bottom:2px solid 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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}

.proof-walk{border:1px solid #879b80;border-radius:5px;padding:16px;margin:0 0 20px;background:#eef0df}.proof-walk h3{font:22px var(--serif);margin-bottom:10px}.proof-walk p{font-size:12px}.proof-walk pre{white-space:pre-wrap;overflow-wrap:anywhere;font:10px/1.7 var(--mono)}.proof-walk>div{display:flex;gap:10px;flex-wrap:wrap}.proof-walk .secondary{color:#23473d;border-color:#557566}.proof-walk .primary{background:#275449;color:#fff}.proof-walk button:disabled{opacity:.5;cursor:default}.node.proof-current{outline:4px solid #235b93;outline-offset:4px;animation:proof-arrive .4s ease-out}.node.proof-sibling{outline:3px dashed #88500c;outline-offset:4px}@keyframes proof-arrive{from{filter:brightness(1.5)}to{filter:brightness(1)}}