:root{--bg: #f6f1e8;--surface: #fffaf2;--surface-2: #efe6d6;--text: #2b2118;--muted: #7a6a58;--line: #e0d3bf;--accent: #b5542b;--accent-text: #fff8f0;--danger: #a33a2c;--user-bubble: #2f3b45;--user-text: #f2ede4;--shadow: 0 8px 30px rgba(60, 40, 20, .12);--radius: 14px;color-scheme:light}@media(prefers-color-scheme:dark){:root{--bg: #17130f;--surface: #211b16;--surface-2: #2b241d;--text: #efe6d8;--muted: #a8977f;--line: #3a3027;--accent: #e07a4c;--accent-text: #1b120c;--danger: #e0695a;--user-bubble: #3b4a56;--user-text: #f2ede4;--shadow: 0 8px 30px rgba(0, 0, 0, .4);color-scheme:dark}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:"Noto Serif TC",Songti TC,Georgia,serif;font-size:16px;line-height:1.7}button,input,textarea{font:inherit;color:inherit}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 20px;border-bottom:1px 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