:root{--bg:#fff;--surface:#f3f4f6;--border:#e4e5e9;--text:#1c1e22;--muted:#62666e;--accent:#155cab;--accent-soft:#e8f0fa;--user-bubble:#155cab;--user-text:#fff;--badge-bg:#f8c446;--badge-text:#2c230a}[data-theme=dark]{--bg:#0e0e10;--surface:#1b1b1f;--border:#2a2a30;--text:#ececee;--muted:#9a9aa3;--accent:#5b9bdf;--accent-soft:#17273c;--user-bubble:#1c4f8f;--user-text:#f2f6fb;--badge-bg:#f8c446;--badge-text:#2c230a}*{box-sizing:border-box}html,body{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}#root{height:100%}.app{flex-direction:column;width:100%;height:100dvh;display:flex}.inner{width:100%;max-width:780px;margin-inline:auto}.header{background:var(--bg);border-bottom:1px solid var(--border)}.header-inner{padding:10px 16px;padding-top:calc(10px + 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