:root{--bg:#f6f5f2;--card:#fff;--text:#1d1d1f;--muted:#6b6b70;--line:#e2e0da;--accent:#6b4fd8;--accent-soft:#ece8fb;--warn:#b4481b}@media (prefers-color-scheme:dark){:root{--bg:#141417;--card:#1d1d22;--text:#ececef;--muted:#9b9ba3;--line:#2f2f37;--accent:#a896ff;--accent-soft:#2a2542;--warn:#ff9a6b}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Hiragino Sans,Noto Sans JP,sans-serif;line-height:1.6}.wrap{max-width:760px;margin:0 auto;padding:24px 16px 48px}h1{margin:0;font-size:1.3rem}h2{margin:0 0 12px;font-size:1rem}.sub,.hint,footer{color:var(--muted);font-size:.875rem}.sub{margin:4px 0 20px}.hint{margin:-4px 0 12px}a{color:var(--accent)}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:16px;padding:16px}button{font:inherit;color:var(--text);border:1px solid var(--line);cursor:pointer;background:0 0;border-radius:8px;padding:6px 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