:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--board-line:#6b6375;--stone-white:#f7f5f0;--stone-black:#2a2730;--danger:#e5484d;--danger-bg:#e5484d1a;--danger-border:#e5484d66;--success:#16a34a;--success-bg:#16a34a1a;--success-border:#16a34a66;--last-move:#d97706;--panel-bg:#00000008;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media 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.reserve-stone{background:var(--stone-black)}@media (width<=640px){.piece-reserve{flex-flow:wrap;max-width:220px}}.app{flex-direction:column;align-items:center;gap:20px;width:100%;display:flex}.back-link{color:var(--text);opacity:.7;margin-top:16px;font-size:14px;text-decoration:none}.back-link:hover{opacity:1;color:var(--accent);text-decoration:underline}.menu{flex-direction:column;align-items:center;gap:16px;padding:32px 0;display:flex}.menu p{max-width:44ch}.option-group{flex-direction:column;align-items:center;gap:10px;display:flex}.option-group-title{color:var(--text-h);margin:0;font-size:15px;font-weight:600}.difficulty-options{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.difficulty-option{font:inherit;border:2px solid var(--border);background:var(--panel-bg);color:var(--text-h);cursor:pointer;border-radius:8px;padding:12px 20px;transition:border-color .2s,background 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