:root{--page: #0f172a;--surface: #1e293b;--hairline: #334155;--text: #e2e8f0;--muted: #94a3b8;--accent: #60a5fa;--action: #3b82f6;--action-hover: #2563eb;--column: 46rem}*{box-sizing:border-box}[hidden]{display:none!important}html{overflow-x:hidden}body{margin:0;padding:0 1rem 4rem;background:var(--page);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.6;overflow-x:hidden}h1,h2,h3{line-height:1.2;margin:0 0 .5rem}h1{font-size:clamp(2.5rem,12vw,4.5rem);letter-spacing:-.02em;color:var(--accent)}h2{font-size:clamp(1.5rem,6vw,2rem)}a{color:var(--accent)}.hero,main>section,footer{max-width:var(--column);margin:0 auto}.hero{padding:3rem 0 2rem;text-align:center}.tagline{font-size:clamp(1.05rem,4vw,1.3rem);color:var(--text);margin:0 auto 2rem;max-width:34rem}.hero-caption,.play-hint,.fine{color:var(--muted);font-size:.9rem}.hero-board,.teach-board,.play-board{display:flex;justify-content:center;margin:0 auto 1rem;min-height:4rem}.hero-board canvas,.teach-board canvas,.play-board canvas{max-width:100%;height:auto;border:1px solid var(--hairline);border-radius:.5rem;background:var(--surface)}.play-board canvas{touch-action:manipulation!important;box-sizing:content-box;max-width:calc(100% - 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