:root{--bg: #ffffff;--bg-soft: #f0f4f9;--sidebar-bg: #f7f9fc;--text: #1f1f1f;--muted: #5f6368;--border: #e3e3e3;--accent: #1a73e8;--accent-soft: #e8f0fe;--user-bubble: #e8f0fe;--bot-bubble: #f7f7f8;--sidebar-w: 280px}@media (prefers-color-scheme: dark){:root{--bg: #131314;--bg-soft: #1e1f20;--sidebar-bg: #1b1c1d;--text: #e3e3e3;--muted: #9aa0a6;--border: #2d2e30;--accent: #8ab4f8;--accent-soft: #1e2a3a;--user-bubble: #2a2b2d;--bot-bubble: #1b1c1d}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Google Sans,Segoe UI,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);-webkit-text-size-adjust:100%}.app{display:flex;height:100vh;height:100dvh;overflow:hidden}.sidebar{width:var(--sidebar-w);flex:0 0 var(--sidebar-w);background:var(--sidebar-bg);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:12px;gap:8px}.new-chat{display:flex;align-items:center;gap:10px;padding:12px 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var(--border)}.main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{display:none;align-items:center;gap:12px;padding:10px 14px;border-bottom:1px solid var(--border)}.menu-btn,.new-btn{border:none;background:transparent;color:var(--text);font-size:22px;cursor:pointer;padding:4px 8px;line-height:1}.topbar-title{flex:1;font-weight:600;font-size:17px}.chat{flex:1;overflow-y:auto;padding:24px 16px}.welcome{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:18px;padding:16px;background:radial-gradient(ellipse 70% 55% at 50% 42%,rgba(66,133,244,.14),transparent 72%)}.welcome h1{font-size:clamp(24px,4vw,36px);font-weight:600;max-width:640px;line-height:1.3;background:linear-gradient(90deg,#4285f4,#1a73e8 40%,#8e6fe0);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.suggestion{max-width:560px;padding:16px 20px;border:1px solid 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5px;border-radius:5px}.sources{margin-top:14px;padding-top:12px;border-top:1px dashed var(--border)}.sources-title{font-size:12px;font-weight:600;color:var(--muted);margin-bottom:8px}.source{display:block;width:100%;text-align:left;border:none;background:transparent;color:var(--accent);font:inherit;font-size:14px;padding:6px 8px;border-radius:8px;cursor:pointer}.source:hover{background:var(--accent-soft);text-decoration:underline}.typing{display:inline-flex;gap:4px}.typing i{width:7px;height:7px;border-radius:50%;background:var(--muted);animation:blink 1.2s infinite both}.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.3}40%{opacity:1}}.composer{padding:10px 16px calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--border)}.composer form{max-width:760px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;background:var(--bg-soft);border:1px solid var(--border);border-radius:26px;padding:6px 6px 6px 18px}.composer textarea{flex:1;min-width:0;border:none;background:transparent;resize:none;outline:none;color:var(--text);font:inherit;font-size:16px;max-height:200px;padding:9px 0}.composer button[type=submit]{flex:0 0 40px;height:40px;border-radius:50%;border:none;background:var(--accent);color:#fff;font-size:18px;cursor:pointer}.composer button[type=submit]:disabled{opacity:.4;cursor:not-allowed}.disclaimer{max-width:760px;margin:8px auto 0;text-align:center;font-size:12px;color:var(--muted)}.overlay{display:none}@media (max-width: 768px){.topbar{display:flex}.sidebar{position:fixed;top:0;left:0;bottom:0;z-index:30;transform:translate(-100%);transition:transform .25s ease;box-shadow:2px 0 12px #00000026}.sidebar.open{transform:translate(0)}.overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;background:#0006}.chat{padding:16px 12px}}