:root{--ink:#1f2937;--muted:#6b7280;--line:#e5e7eb;--paper:#fff;--accent:#2563eb;--accent-soft:#eff6ff;--red:#dc2626;--red-soft:#fef2f2;--leaf:#16a34a;--night:#1b1f27;--glass:#ffffffeb;--shadow:0 10px 30px #0f172a2e}*{box-sizing:border-box}html,body{height:100%;margin:0}body{color:var(--ink);background:var(--night);-webkit-font-smoothing:antialiased;font-family:Hiragino Sans,Hiragino Kaku Gothic ProN,Noto Sans JP,system-ui,sans-serif}button{font:inherit;cursor:pointer;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:10px;padding:7px 14px}button:disabled{opacity:.45;cursor:default}.muted{color:var(--muted);font-size:13.5px;line-height:1.7}.small{font-size:12px}.problem{color:var(--red);font-size:13px}.entrance{background:radial-gradient(circle at 20% 20%, #2563eb59, transparent 45%), radial-gradient(circle at 80% 80%, #16a34a4d, transparent 45%), repeating-linear-gradient(0deg, #ffffff09 0 1px, transparent 1px 32px), repeating-linear-gradient(90deg, 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