:root{--bg: #f5f7fb;--surface: #ffffff;--surface-2: #f0f3f9;--border: #e3e8ef;--text: #1a2233;--text-muted: #5b6b85;--accent: #2563eb;--accent-hover: #1d4ed8;--user-bubble: #2563eb;--user-text: #ffffff;--assistant-bubble: #ffffff;--assistant-text: #1a2233;--danger: #b42318;--danger-bg: #fef3f2;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);--shadow-md: 0 4px 16px rgba(15, 23, 42, .08);--radius: 12px}@media (prefers-color-scheme: dark){:root{--bg: #0f1419;--surface: #1a1f2b;--surface-2: #232a38;--border: #2a3142;--text: #e6e9ef;--text-muted: #8a94a8;--assistant-bubble: #232a38;--assistant-text: #e6e9ef;--danger-bg: #3a1d1d}}*{box-sizing:border-box}html,body,#root{height:100%}body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);margin:0;-webkit-font-smoothing:antialiased}.app{max-width:880px;margin:0 auto;height:100%;display:flex;flex-direction:column;padding:16px}.app>header{display:flex;align-items:center;gap:12px;padding:4px 8px 16px}.app>header h1{margin:0;font-size:20px;font-weight:600;letter-spacing:-.01em}.app>main{flex:1;min-height:0;display:flex}.chat{flex:1;display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);overflow:hidden}.settings{border-bottom:1px solid var(--border);background:var(--surface-2)}.settings-bar{display:flex;justify-content:space-between;gap:8px;padding:8px 12px}button.ghost{background:transparent;border:1px solid var(--border);color:var(--text-muted);padding:6px 12px;border-radius:8px;font-size:13px;cursor:pointer;transition:all .15s ease}button.ghost:hover:not(:disabled){background:var(--surface);color:var(--text)}button.ghost:disabled{opacity:.5;cursor:not-allowed}button.ghost.danger:hover:not(:disabled){color:var(--danger);border-color:var(--danger)}.settings-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;padding:12px;border-top:1px solid var(--border)}.settings-content label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--text-muted)}.settings-content label.checkbox{flex-direction:row;align-items:center;gap:8px;font-size:13px;color:var(--text)}.settings-content input,.settings-content select{padding:6px 8px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:6px;font-size:14px;font-family:inherit}.settings-content input:focus,.settings-content select:focus{outline:2px solid var(--accent);outline-offset:-1px;border-color:transparent}.messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px;scroll-behavior:smooth}.messages.empty{align-items:center;justify-content:center}.empty-state{text-align:center;color:var(--text-muted)}.empty-state h2{margin:0 0 8px;font-size:22px;font-weight:600;color:var(--text)}.empty-state p{margin:0;font-size:14px}.message{display:flex;gap:10px;max-width:100%;animation:fade-in .18s ease-out}.message.user{flex-direction:row-reverse}@keyframes fade-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.avatar{flex:0 0 32px;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:600;color:#fff;background:var(--accent);-webkit-user-select:none;user-select:none}.message.assistant .avatar{background:linear-gradient(135deg,#6366f1,#8b5cf6)}.bubble{max-width:calc(100% - 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44px)}.settings-content{grid-template-columns:1fr}}