:root{--bg: #0f172a;--panel: #1e293b;--panel-2: #273449;--text: #e2e8f0;--text-dim: #94a3b8;--user: #2563eb;--assistant: #334155;--border: #334155;--accent: #38bdf8;--danger: #f87171}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:var(--bg);color:var(--text)}#root{display:flex;align-items:center;justify-content:center;padding:16px}.chat-container{width:100%;max-width:820px;height:100%;max-height:100vh;display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--border);border-radius:16px;overflow:hidden;box-shadow:0 18px 48px #00000073}.chat-header{padding:14px 20px;border-bottom:1px solid var(--border);display:flex;align-items:baseline;gap:12px;background:var(--panel-2)}.chat-header h1{margin:0;font-size:18px;font-weight:600;letter-spacing:.2px}.chat-sub{color:var(--text-dim);font-size:12px}.chat-scroll{flex:1;overflow-y:auto;padding:20px}.chat-messages{display:flex;flex-direction:column;gap:10px}.bubble{max-width:78%;padding:10px 14px;border-radius:14px;line-height:1.45;white-space:pre-wrap;word-wrap:break-word;font-size:14.5px;animation:pop-in .12s ease-out}@keyframes pop-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.bubble-user{align-self:flex-end;background:var(--user);color:#fff;border-bottom-right-radius:4px}.bubble-assistant{align-self:flex-start;background:var(--assistant);color:var(--text);border-bottom-left-radius:4px}.typing{display:inline-flex;gap:4px;align-items:center;padding:12px 16px}.dot{width:6px;height:6px;border-radius:50%;background:var(--text-dim);animation:blink 1.2s infinite ease-in-out both}.dot:nth-child(2){animation-delay:.2s}.dot:nth-child(3){animation-delay:.4s}@keyframes blink{0%,80%,to{opacity:.3;transform:translateY(0)}40%{opacity:1;transform:translateY(-2px)}}.chat-input-row{display:flex;gap:10px;padding:12px;border-top:1px solid var(--border);background:var(--panel-2)}.chat-input{flex:1;resize:none;min-height:42px;max-height:200px;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:var(--panel);color:var(--text);font-family:inherit;font-size:14.5px;line-height:1.4;outline:none}.chat-input:focus{border-color:var(--accent)}.chat-input:disabled{opacity:.7}.chat-send{padding:0 18px;border:none;border-radius:10px;background:var(--user);color:#fff;font-weight:600;cursor:pointer;font-size:14px}.chat-send:disabled{opacity:.5;cursor:not-allowed}.chat-error{padding:8px 16px;background:#f871711f;color:var(--danger);font-size:13px;border-top:1px solid var(--border)}