:root{color-scheme:light dark;--color-bg: #f4f5f7;--color-surface: #ffffff;--color-surface-raised: #ffffff;--color-border: #e2e4e9;--color-text: #1a1d23;--color-text-muted: #6b7280;--color-brand: #2563eb;--color-brand-hover: #1d4ed8;--color-brand-text: #ffffff;--color-assistant-bubble: #eef0f3;--color-error-bg: #fdecec;--color-error-text: #b42318;--color-error-border: #f3aeae;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .06);--shadow-md: 0 4px 16px rgba(16, 24, 40, .08);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px}@media (prefers-color-scheme: dark){:root{--color-bg: #101215;--color-surface: #16181d;--color-surface-raised: #1c1f26;--color-border: #2a2d35;--color-text: #e7e9ec;--color-text-muted: #9aa1ac;--color-brand: #3b82f6;--color-brand-hover: #60a5fa;--color-brand-text: #ffffff;--color-assistant-bubble: #21242b;--color-error-bg: #2c1414;--color-error-text: #f28b8b;--color-error-border: #5c2626;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 20px rgba(0, 0, 0, .35)}}*{box-sizing:border-box}html,body{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;margin:0;background:var(--color-bg);color:var(--color-text)}#root{display:flex;flex-direction:column;height:100vh}.app-shell{display:flex;flex-direction:column;flex:1;min-height:0;max-width:820px;width:100%;margin:0 auto;padding:1.25rem 1rem}.app-header{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1rem}.app-header .brand{display:flex;align-items:center;gap:.6rem}.app-header .brand-mark{width:34px;height:34px;border-radius:var(--radius-sm);background:var(--color-brand);color:var(--color-brand-text);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.95rem;flex-shrink:0}.app-header h1{font-size:1.05rem;font-weight:600;margin:0;line-height:1.2}.app-header .subtitle{font-size:.78rem;color:var(--color-text-muted)}button{font:inherit;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}.btn{display:inline-flex;align-items:center;gap:.4rem;padding:.45rem .9rem;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);font-size:.85rem;font-weight:500;transition:background-color .15s ease,border-color .15s ease}.btn:hover:not(:disabled){background:var(--color-assistant-bubble)}.btn-icon{width:16px;height:16px}.chat-panel{flex:1;min-height:0;display:flex;flex-direction:column;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}#messages{flex:1;overflow-y:auto;padding:1.25rem;display:flex;flex-direction:column;gap:.9rem}#messages::-webkit-scrollbar{width:8px}#messages::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:4px}.welcome{margin:auto;text-align:center;max-width:420px;padding:1.5rem;color:var(--color-text-muted)}.welcome h2{color:var(--color-text);font-size:1.15rem;margin:0 0 .4rem}.welcome p{margin:0 0 1.1rem;font-size:.9rem}.suggestions{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}.suggestion-chip{padding:.5rem .9rem;border-radius:999px;border:1px solid var(--color-border);background:var(--color-surface-raised);color:var(--color-text);font-size:.82rem;text-align:left;transition:border-color .15s ease,transform .1s ease}.suggestion-chip:hover{border-color:var(--color-brand);transform:translateY(-1px)}.msg{display:flex;gap:.6rem;align-items:flex-start;animation:msg-in .15s ease-out}@keyframes msg-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.msg.user{flex-direction:row-reverse}.avatar{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:.75rem;font-weight:600}.msg.assistant .avatar{background:var(--color-brand);color:var(--color-brand-text)}.msg.user .avatar{background:var(--color-assistant-bubble);color:var(--color-text-muted)}.msg-body{display:flex;flex-direction:column;max-width:75%}.msg.user .msg-body{align-items:flex-end}.bubble{padding:.6rem .85rem;border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.bubble-text{white-space:pre-wrap;font-size:.92rem;line-height:1.45}.msg.user .bubble{background:var(--color-brand);color:var(--color-brand-text);border-bottom-right-radius:4px}.msg.assistant .bubble{background:var(--color-assistant-bubble);color:var(--color-text);border-bottom-left-radius:4px}.msg.assistant .bubble.error{background:var(--color-error-bg);color:var(--color-error-text);border:1px solid var(--color-error-border)}.msg-timestamp{font-size:.7rem;color:var(--color-text-muted);margin-top:.25rem;padding:0 .2rem}.typing-indicator{display:inline-flex;gap:.25rem;align-items:center;padding:.15rem 0}.typing-indicator span{width:6px;height:6px;border-radius:50%;background:var(--color-text-muted);animation:typing-bounce 1.1s infinite ease-in-out}.typing-indicator span:nth-child(2){animation-delay:.15s}.typing-indicator span:nth-child(3){animation-delay:.3s}@keyframes typing-bounce{0%,60%,to{transform:translateY(0);opacity:.6}30%{transform:translateY(-4px);opacity:1}}.table-scroll{overflow-x:auto;margin-top:.6rem;border-radius:var(--radius-sm);border:1px solid var(--color-border)}table{border-collapse:collapse;width:100%;font-size:.82rem}th,td{padding:.4rem .65rem;text-align:left;white-space:nowrap}th{background:var(--color-surface-raised);color:var(--color-text-muted);font-weight:600;border-bottom:1px solid var(--color-border);position:sticky;top:0}td{border-bottom:1px solid var(--color-border)}tr:last-child td{border-bottom:none}.csv-link{display:inline-flex;align-items:center;gap:.3rem;margin-top:.5rem;font-size:.82rem;color:inherit;text-decoration:underline}#chat-form{display:flex;align-items:flex-end;gap:.6rem;padding:.75rem 1rem;border-top:1px solid var(--color-border);background:var(--color-surface)}textarea.chat-textarea{flex:1;font:inherit;font-size:.92rem;padding:.55rem .8rem;border-radius:var(--radius-md);border:1px solid var(--color-border);background:var(--color-bg);color:var(--color-text);resize:none;max-height:160px;line-height:1.4}textarea.chat-textarea:focus{outline:none;border-color:var(--color-brand)}.send-btn{width:40px;height:40px;border-radius:50%;border:none;background:var(--color-brand);color:var(--color-brand-text);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:background-color .15s ease}.send-btn:hover:not(:disabled){background:var(--color-brand-hover)}.send-btn svg{width:18px;height:18px}@media (max-width: 520px){.app-shell{padding:.75rem}.msg-body{max-width:85%}}