:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;min-width:320px;height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}*{box-sizing:border-box}.app{min-height:100vh;background:linear-gradient(135deg,#f5f7fa,#c3cfe2);display:flex;align-items:center;justify-content:center;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif}.card{width:76%;max-width:1200px;background:#fff;border:1px solid #e6e9ef;border-radius:12px;box-shadow:0 10px 30px #0000000f;padding:20px 20px 16px}.app-header{text-align:center;margin-bottom:16px}.app-header h1{margin:0 0 4px;font-size:1.8rem;color:#222}.app-header p{margin:0;opacity:.8;font-size:1rem;color:#555}.app-main{width:100%}.toolbar{display:flex;justify-content:flex-end;align-items:center;margin-bottom:12px}.agent-label{display:flex;align-items:center;gap:8px;color:#333}.agent-select{padding:6px 10px;border:1px solid #e1e5e9;border-radius:6px;outline:none}.input-container{display:flex;gap:10px;margin-bottom:20px}.input-field{flex:1;padding:15px 20px;border:2px solid #e1e5e9;border-radius:8px;font-size:1rem;transition:border-color .3s ease;outline:none;background-color:#fff;color:#333}.input-field:focus{border-color:#4b6cb7;box-shadow:0 0 0 3px #4b6cb733}.input-field:disabled{background-color:#f5f7fa;cursor:not-allowed}.send-button{padding:15px 25px;background:linear-gradient(90deg,#4b6cb7,#182848);color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:transform .2s ease,box-shadow .2s ease;display:flex;align-items:center;justify-content:center}.send-button:hover:not(.disabled){transform:translateY(-2px);box-shadow:0 4px 12px #4b6cb74d}.send-button:active:not(.disabled){transform:translateY(0)}.send-button.disabled{opacity:.6;cursor:not-allowed}.button-content{display:flex;align-items:center;gap:8px}.spinner{width:16px;height:16px;border:2px solid #ffffff;border-bottom-color:transparent;border-radius:50%;display:inline-block;animation:rotation 1s linear infinite}@keyframes rotation{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-message{padding:15px;background-color:#ffebee;border:1px solid #ffcdd2;border-radius:8px;color:#c62828;margin-bottom:20px}.chat-container{background-color:#fff;border:1px solid #e1e5e9;border-radius:10px;padding:16px;min-height:280px;max-height:60vh;overflow-y:auto;margin-bottom:16px}.empty-tip{color:#666;text-align:center;padding:24px 0}.chat-list{display:flex;flex-direction:column;gap:14px}.chat-item{display:flex;align-items:flex-start;gap:12px}.chat-item.right{justify-content:flex-end}.chat-item.left{justify-content:flex-start}.avatar{flex-shrink:0;width:36px;height:36px;border-radius:50%;background:linear-gradient(90deg,#4b6cb7,#182848);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}.avatar.user{background:linear-gradient(90deg,#34d399,#3b82f6)}.avatar.ai{background:linear-gradient(90deg,#a78bfa,#f472b6)}.bubble{background:#f6f8fb;border:1px solid #e5eaf0;border-radius:10px;padding:10px 12px;color:#333;max-width:620px}.bubble.user{background:linear-gradient(90deg,#3b82f6,#2563eb);color:#fff;border:none}.bubble.ai{background:#fff}.time{font-size:12px;margin-top:6px}.time.user{color:#fffc}.time.ai{color:#98a2b3}.thinking{color:#667085;display:flex;align-items:center;gap:8px}.spinner.small{width:14px;height:14px;border-width:2px}.header-bar{display:flex;align-items:center;justify-content:space-between;padding:8px 0 14px;border-bottom:1px solid #eef2f6;margin-bottom:12px}.brand{display:flex;align-items:center;gap:10px}.brand-icon{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:linear-gradient(90deg,#3b82f6,#8b5cf6);color:#fff;font-weight:700}.brand-meta{line-height:1.2}.brand-title{font-size:18px;font-weight:600;color:#1f2937}.brand-sub{font-size:12px;color:#6b7280}.foot-tip{text-align:center;color:#98a2b3;font-size:12px;margin-top:6px}@media (max-width: 768px){.app{padding:10px}.card{width:94%;padding:16px}.input-container{flex-direction:column}.app-header h1{font-size:1.5rem}.app-header p{font-size:1rem}}