:root{--bg: #fbfbfd;--bg-elevated: #ffffff;--sidebar: rgba(255, 255, 255, .72);--text: #1d1d1f;--text-secondary: #6e6e73;--text-tertiary: #86868b;--accent: #0071e3;--accent-hover: #0077ed;--border: rgba(0, 0, 0, .06);--shadow: 0 2px 16px rgba(0, 0, 0, .06);--radius: 18px;--radius-sm: 12px;--font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", sans-serif;--sidebar-width: 280px;--transition: .35s cubic-bezier(.25, .1, .25, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:var(--font);font-size:15px;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}.app{display:flex;height:100vh;overflow:hidden}.sidebar{width:var(--sidebar-width);flex-shrink:0;display:flex;flex-direction:column;padding:28px 20px 24px;background:var(--sidebar);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-right:1px solid var(--border)}.sidebar-header{padding:0 8px 32px}.logo{width:36px;height:36px;border-radius:10px;background:linear-gradient(145deg,#1d1d1f,#424245);margin-bottom:20px}.brand{font-size:22px;font-weight:600;letter-spacing:-.02em;line-height:1.2}.tagline{margin-top:6px;font-size:13px;color:var(--text-tertiary);font-weight:400}.agent-nav{flex:1;display:flex;flex-direction:column;gap:6px}.agent-item{display:flex;align-items:flex-start;gap:14px;width:100%;padding:14px 16px;border:none;border-radius:var(--radius-sm);background:transparent;cursor:pointer;text-align:left;font-family:inherit;color:var(--text);transition:background var(--transition),transform .2s ease}.agent-item:hover{background:#0000000a}.agent-item.active{background:var(--bg-elevated);box-shadow:var(--shadow)}.agent-item.active .agent-icon{background:var(--accent);color:#fff}.agent-icon{flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:10px;background:#0000000d;color:var(--text-secondary);transition:background var(--transition),color var(--transition)}.agent-icon svg{width:18px;height:18px}.agent-meta{min-width:0}.agent-name{font-size:15px;font-weight:600;letter-spacing:-.01em}.agent-subtitle{margin-top:2px;font-size:12px;color:var(--text-tertiary);line-height:1.35}.sidebar-footer{display:flex;align-items:center;gap:8px;padding:16px 8px 0;font-size:12px;color:var(--text-tertiary)}.status-dot{width:7px;height:7px;border-radius:50%;background:#86868b;flex-shrink:0}.sidebar-footer.connected .status-dot{background:#34c759;box-shadow:0 0 0 2px #34c75940}.sidebar-footer.error .status-dot{background:#ff3b30;box-shadow:0 0 0 2px #ff3b3033}.chat-panel{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg)}.chat-header{flex-shrink:0;padding:32px 48px 20px;border-bottom:1px solid var(--border);background:#fbfbfdcc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.chat-header h2{font-size:28px;font-weight:600;letter-spacing:-.03em}.chat-header p{margin-top:6px;font-size:15px;color:var(--text-secondary)}.messages{flex:1;overflow-y:auto;padding:32px 48px;display:flex;flex-direction:column;gap:20px;scroll-behavior:smooth}.messages::-webkit-scrollbar{width:6px}.messages::-webkit-scrollbar-thumb{background:#0000001f;border-radius:3px}.welcome{max-width:520px;margin:auto;text-align:center;padding:48px 24px;animation:fadeUp .6s ease}.welcome h3{font-size:32px;font-weight:600;letter-spacing:-.03em;margin-bottom:12px}.welcome p{font-size:17px;color:var(--text-secondary);line-height:1.5}.welcome .chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:28px}.chip{padding:10px 18px;border-radius:999px;border:1px solid var(--border);background:var(--bg-elevated);font-size:13px;color:var(--text-secondary);cursor:pointer;transition:border-color .2s,color .2s}.chip:hover{border-color:var(--accent);color:var(--accent)}.message{display:flex;gap:12px;max-width:720px;animation:fadeUp .4s ease}.message.user{align-self:flex-end;flex-direction:row-reverse}.message-avatar{flex-shrink:0;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600}.message.assistant .message-avatar{background:linear-gradient(145deg,#1d1d1f,#424245);color:#fff}.message.user .message-avatar{background:var(--accent);color:#fff}.message-body{display:flex;flex-direction:column;gap:8px}.message-bubble{padding:14px 18px;border-radius:var(--radius);line-height:1.55;font-size:15px;white-space:pre-wrap;word-break:break-word}.message.assistant .message-bubble{background:var(--bg-elevated);box-shadow:var(--shadow);color:var(--text)}.message.user .message-bubble{background:var(--accent);color:#fff}.message-bubble strong{font-weight:600}.message-bubble code{font-size:13px;padding:2px 6px;border-radius:6px;background:#0000000f;word-break:break-all}.message-files{display:flex;flex-wrap:wrap;gap:8px}.file-pill{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;background:#0071e314;color:var(--accent);font-size:13px;text-decoration:none;transition:background .2s}.file-pill:hover{background:#0071e324}.file-pill.download{font-weight:500}.message-time{font-size:11px;color:var(--text-tertiary);padding:0 4px}.message.user .message-time{text-align:right}.typing{display:flex;gap:5px;padding:16px 20px}.typing span{width:7px;height:7px;border-radius:50%;background:var(--text-tertiary);animation:bounce 1.2s infinite ease-in-out}.typing span:nth-child(2){animation-delay:.15s}.typing span:nth-child(3){animation-delay:.3s}.composer{flex-shrink:0;padding:16px 48px 28px;border-top:1px solid var(--border);background:#fbfbfdeb;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.composer-inner{display:flex;align-items:flex-end;gap:10px;padding:10px 12px 10px 14px;background:var(--bg-elevated);border-radius:22px;box-shadow:var(--shadow),0 0 0 1px var(--border)}.icon-btn{flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border:none;border-radius:50%;background:transparent;color:var(--text-secondary);cursor:pointer;transition:background .2s,color .2s}.icon-btn:hover{background:#0000000d;color:var(--text)}.message-input{flex:1;border:none;outline:none;resize:none;font-family:inherit;font-size:15px;line-height:1.45;max-height:120px;padding:8px 4px;background:transparent;color:var(--text)}.message-input::placeholder{color:var(--text-tertiary)}.send-btn{flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;border:none;border-radius:50%;background:var(--accent);color:#fff;cursor:pointer;transition:background .2s,opacity .2s,transform .15s}.send-btn:hover:not(:disabled){background:var(--accent-hover);transform:scale(1.04)}.send-btn:disabled{opacity:.35;cursor:not-allowed}.composer-hint{margin-top:10px;padding-left:14px;font-size:12px;color:var(--text-tertiary)}.pending-files{display:flex;flex-wrap:wrap;gap:6px;padding:0 48px 8px}.pending-file{font-size:12px;padding:4px 10px;border-radius:6px;background:#0000000d;color:var(--text-secondary)}@keyframes fadeUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes bounce{0%,80%,to{transform:scale(.85);opacity:.5}40%{transform:scale(1);opacity:1}}@media(max-width:768px){.app{flex-direction:column}.sidebar{width:100%;flex-direction:row;flex-wrap:wrap;padding:16px;border-right:none;border-bottom:1px solid var(--border)}.sidebar-header{display:none}.agent-nav{flex-direction:row;overflow-x:auto;width:100%}.agent-item{flex-shrink:0;min-width:140px}.sidebar-footer{display:none}.chat-header,.messages,.composer{padding-left:20px;padding-right:20px}}