*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f5f5f7;--surface: #ffffff;--surface-hover: #f0f0f2;--text: #1d1d1f;--text-secondary: #6e6e73;--border: #d2d2d7;--accent: #0071e3;--accent-hover: #0077ed;--user-bg: #e8f0fe;--user-border: #c6dafc;--ai-bg: #ffffff;--ai-border: #e5e5ea;--shadow: rgba(0,0,0,.04);--radius: 12px;--radius-sm: 8px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--mono: "SF Mono", "Fira Code", "JetBrains Mono", monospace}html,body,#root{height:100%;font-family:var(--font);font-size:15px;line-height:1.5;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}.app{display:flex;flex-direction:column;height:100%;max-width:860px;margin:0 auto;position:relative}.header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:#ffffffd9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.header-left{display:flex;align-items:center;gap:10px}.header-logo{font-size:18px;font-weight:700;color:var(--text)}.status-dot{width:8px;height:8px;border-radius:50%}.status-dot.connected{background:#30d158}.status-dot.disconnected{background:#ff9f0a;animation:pulse 1.5s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.status-text{font-size:13px;color:var(--text-secondary)}.header-right{display:flex;gap:6px}.btn-icon{width:36px;height:36px;border:none;background:transparent;border-radius:var(--radius-sm);cursor:pointer;color:var(--text-secondary);display:flex;align-items:center;justify-content:center;transition:all .15s}.btn-icon:hover{background:var(--surface-hover);color:var(--text)}.messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px;scroll-behavior:smooth}.empty-state{text-align:center;padding:80px 20px;color:var(--text-secondary)}.empty-icon{font-size:48px;margin-bottom:16px}.empty-state h2{font-size:24px;font-weight:700;color:var(--text);margin-bottom:8px}.empty-state p{font-size:15px;margin-bottom:4px}.empty-hint{font-size:13px!important;color:var(--text-secondary);margin-top:12px!important}.message{display:flex;gap:12px;animation:fadeIn .2s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.msg-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:18px;flex-shrink:0;background:var(--surface);border:1px solid var(--border)}.message.user .msg-avatar{background:var(--user-bg);border-color:var(--user-border)}.msg-body{flex:1;min-width:0}.msg-header{display:flex;align-items:center;gap:8px;margin-bottom:4px}.msg-name{font-weight:600;font-size:14px;color:var(--text)}.msg-time{font-size:12px;color:var(--text-secondary)}.msg-content{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 16px;line-height:1.6;word-wrap:break-word;overflow-wrap:break-word}.message.user .msg-content{background:var(--user-bg);border-color:var(--user-border)}.message.streaming .msg-content{border-color:var(--accent)}.msg-content p{margin-bottom:8px}.msg-content p:last-child{margin-bottom:0}.msg-content ul,.msg-content ol{margin:8px 0;padding-left:24px}.msg-content li{margin-bottom:4px}.msg-content h1,.msg-content h2,.msg-content h3,.msg-content h4{margin:16px 0 8px;line-height:1.3}.msg-content h1{font-size:20px}.msg-content h2{font-size:18px}.msg-content h3{font-size:16px}.msg-content blockquote{border-left:3px solid var(--accent);padding-left:12px;margin:8px 0;color:var(--text-secondary)}.msg-content a{color:var(--accent);text-decoration:none}.msg-content a:hover{text-decoration:underline}.msg-content strong{font-weight:600}.msg-content hr{border:none;border-top:1px solid var(--border);margin:16px 0}.msg-content table{border-collapse:collapse;margin:8px 0;width:100%}.msg-content th,.msg-content td{border:1px solid var(--border);padding:6px 10px;text-align:left;font-size:14px}.msg-content th{background:var(--surface-hover);font-weight:600}.code-block{margin:8px 0;border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--border);background:#f8f8fa}.code-lang{padding:4px 12px;font-size:12px;color:var(--text-secondary);background:#eeeef0;text-transform:uppercase;letter-spacing:.5px}.code-block pre{padding:12px 16px;overflow-x:auto;font-size:13px;line-height:1.5}.code-block code{font-family:var(--mono);background:none;padding:0}.inline-code{font-family:var(--mono);background:#eeeef0;padding:2px 6px;border-radius:4px;font-size:13px}.inline-image{max-width:100%;max-height:300px;border-radius:var(--radius-sm);margin:8px 0}.msg-file{display:flex;align-items:center;gap:8px;padding:8px 12px;background:var(--surface-hover);border-radius:var(--radius-sm);margin-bottom:8px}.msg-file a{color:var(--accent);font-size:14px}.msg-image{max-width:100%;max-height:300px;border-radius:var(--radius-sm);margin-bottom:8px}.spinner{animation:spin .8s linear infinite;vertical-align:middle;margin-left:4px;color:var(--accent)}@keyframes spin{to{transform:rotate(360deg)}}.file-bar{display:flex;align-items:center;gap:8px;padding:8px 20px;background:var(--surface);border-top:1px solid var(--border);overflow-x:auto}.file-chip{display:flex;align-items:center;gap:6px;padding:4px 10px;background:var(--surface-hover);border-radius:20px;font-size:13px;white-space:nowrap}.chip-preview{width:24px;height:24px;border-radius:4px;object-fit:cover}.chip-icon{display:flex}.chip-name{max-width:150px;overflow:hidden;text-overflow:ellipsis}.chip-remove{border:none;background:transparent;cursor:pointer;color:var(--text-secondary);font-size:16px;line-height:1;padding:0 2px}.chip-remove:hover{color:var(--text)}.file-bar-hint{font-size:12px;color:var(--text-secondary);margin-left:auto}.input-area{display:flex;align-items:flex-end;gap:8px;padding:12px 20px;padding-bottom:max(12px,env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--border)}.attach-btn{margin-bottom:2px}.input-field{flex:1;border:1px solid var(--border);border-radius:var(--radius);padding:10px 14px;font-family:var(--font);font-size:15px;line-height:1.4;resize:none;outline:none;background:var(--bg);color:var(--text);min-height:44px;max-height:120px;transition:border-color .15s}.input-field:focus{border-color:var(--accent)}.input-field::placeholder{color:var(--text-secondary)}.input-field:disabled{opacity:.6}.btn-send{width:44px;height:44px;border:none;background:var(--accent);color:#fff;border-radius:var(--radius);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}.btn-send:hover{background:var(--accent-hover)}.btn-send:disabled{opacity:.4;cursor:default}.btn-stop{width:44px;height:44px;border:1px solid var(--border);background:var(--surface);color:#ff453a;border-radius:var(--radius);cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0}.btn-stop:hover{background:#fff0ef}.drop-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#0071e314;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;pointer-events:none}.drop-content{text-align:center;color:var(--accent);font-size:18px;font-weight:600}.drop-content svg{margin-bottom:12px}@media(max-width:640px){.messages{padding:12px}.input-area{padding:8px 12px}.header{padding:10px 12px}.msg-avatar{width:30px;height:30px;font-size:15px}.app{max-width:100%}}