:root{--bg:#f5f6f8;--panel:#fff;--text:#1f2328;--muted:#8a8f98;--border:#e3e5e8;--primary:#2f6fed;--user-bubble:#2f6fed;--user-text:#fff;--bot-bubble:#fff;--danger:#d1242f;--code-bg:#f0f2f5}@media (prefers-color-scheme:dark){:root{--bg:#16181c;--panel:#1e2126;--text:#e6e8eb;--muted:#8a8f98;--border:#2d3138;--primary:#4c8dff;--user-bubble:#3a6fd8;--bot-bubble:#23272d;--danger:#ff6b6b;--code-bg:#2a2e35}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px}.app{background:var(--panel);border-left:1px solid var(--border);border-right:1px solid var(--border);flex-direction:column;max-width:820px;height:100vh;margin:0 auto;display:flex}header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 16px;font-weight:600;display:flex}.new-chat{border:1px solid 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