:root{--bg: #f4f2ee;--surface: #ffffff;--surface-sunken: #ece8e1;--border: #ddd7cb;--text: #2a2620;--text-dim: #756e60;--text-faint: #a49d8c;--problem: #b3502a;--problem-bg: #fbeee6;--solution: #1f7a63;--solution-bg: #e7f3ee;--chip-bg: #efe9dd;--focus: #2a2620}@media (prefers-color-scheme: dark){:root{--bg: #1c1a16;--surface: #262319;--surface-sunken: #211f18;--border: #3a362c;--text: #efe9dd;--text-dim: #b0a894;--text-faint: #7d7666;--problem: #e08a63;--problem-bg: #3a2418;--solution: #5cc4a4;--solution-bg: #123227;--chip-bg: #302c22;--focus: #efe9dd}}:root[data-theme=dark]{--bg: #1c1a16;--surface: #262319;--surface-sunken: #211f18;--border: #3a362c;--text: #efe9dd;--text-dim: #b0a894;--text-faint: #7d7666;--problem: #e08a63;--problem-bg: #3a2418;--solution: #5cc4a4;--solution-bg: #123227;--chip-bg: #302c22;--focus: #efe9dd}:root[data-theme=light]{--bg: #f4f2ee;--surface: #ffffff;--surface-sunken: #ece8e1;--border: #ddd7cb;--text: #2a2620;--text-dim: #756e60;--text-faint: #a49d8c;--problem: #b3502a;--problem-bg: #fbeee6;--solution: #1f7a63;--solution-bg: #e7f3ee;--chip-bg: #efe9dd;--focus: #2a2620}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Hiragino Kaku Gothic ProN,Hiragino Sans,Yu Gothic UI,Noto Sans JP,system-ui,sans-serif;font-feature-settings:"palt"}.app{max-width:720px;margin:0 auto;padding:28px 20px 80px}.brand{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:22px}.brand-mark{font-family:Georgia,Times New Roman,serif;font-style:italic;font-size:21px;letter-spacing:.02em;color:var(--text)}.brand-mark b{font-style:normal;font-weight:700}.brand-sub{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint)}.logout-btn{background:none;border:none;color:var(--text-faint);font-size:12px;cursor:pointer}.tabs{display:grid;grid-template-columns:1fr 1fr;background:var(--surface-sunken);border:1px solid 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