*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:linear-gradient(160deg,#eef2ff,#f5f3ff 45%,#eff6ff)}.app-shell{height:100%;display:flex;flex-direction:column;max-width:880px;margin:0 auto;padding:20px 16px 24px}.app-header{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-radius:18px;background:linear-gradient(135deg,#6366f1,#8b5cf6 55%,#a855f7);color:#fff;box-shadow:0 10px 30px #6366f159;margin-bottom:16px}.header-brand{display:flex;align-items:center;gap:12px}.header-logo{font-size:30px}.header-title{font-size:18px;font-weight:700;letter-spacing:.5px}.header-subtitle{font-size:12px;opacity:.85}.header-clear-btn{background:#ffffff2e!important;border-color:transparent!important;color:#fff!important;box-shadow:none!important}.header-clear-btn:hover{background:#ffffff52!important;color:#fff!important}.chat-panel{flex:1;min-height:0;display:flex;flex-direction:column;background:#ffffffe0;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-radius:18px;box-shadow:0 12px 40px #4f46e51f;overflow:hidden}.message-list{flex:1;min-height:0;overflow-y:auto;padding:24px 24px 8px}.message-row{display:flex;align-items:flex-start;gap:10px;margin-bottom:16px}.row-user{flex-direction:row-reverse}.msg-avatar.ant-avatar{flex-shrink:0;background:linear-gradient(135deg,#6366f1,#a855f7);color:#fff}.row-user .msg-avatar.ant-avatar{background:#e0e7ff;color:#4f46e5}.message-bubble{max-width:72%;padding:10px 14px;border-radius:14px;font-size:14px;line-height:1.7;white-space:pre-wrap;word-break:break-word}.bubble-ai{background:#f4f5fb;color:#1f2937;border-top-left-radius:4px}.bubble-user{background:linear-gradient(135deg,#6366f1,#7c6ff5);color:#fff;border-top-right-radius:4px}.typing-dots{display:flex;gap:5px;padding:4px 2px}.typing-dots span{width:7px;height:7px;border-radius:50%;background:#a5b4fc;animation:bounce 1.2s infinite ease-in-out}.typing-dots span:nth-child(2){animation-delay:.15s}.typing-dots span:nth-child(3){animation-delay:.3s}@keyframes bounce{0%,60%,to{transform:translateY(0);opacity:.5}30%{transform:translateY(-5px);opacity:1}}.stage-steps{padding:14px 24px 8px;background:#fff;border-bottom:1px solid #eef0f6}.empty-state{min-height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;color:#4b5563;padding:12px 0}.empty-logo{width:72px;height:72px;display:flex;align-items:center;justify-content:center;font-size:36px;border-radius:24px;background:linear-gradient(135deg,#e0e7ff,#ede9fe);margin-bottom:16px}.empty-state h2{margin:0 0 6px;font-size:20px;color:#111827}.empty-state p{margin:0 0 24px;font-size:14px;color:#6b7280;max-width:480px}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;width:100%;max-width:640px}.topic-card{text-align:left;padding:14px 16px;border-radius:14px;border:1px solid #e5e7f4;background:#fff;cursor:pointer;transition:all .2s}.topic-card:hover{border-color:#a5b4fc;box-shadow:0 8px 20px #6366f126;transform:translateY(-2px)}.topic-tag{display:inline-block;font-size:12px;line-height:20px;padding:0 10px;border-radius:999px;margin-bottom:8px}.tag-mode1{background:#e0e7ff;color:#4338ca}.tag-mode2{background:#dcfce7;color:#15803d}.tag-mode3{background:#fae8ff;color:#a21caf}.topic-title{font-size:14px;font-weight:600;color:#111827;margin-bottom:4px}.topic-text{font-size:12px;color:#6b7280;line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.chat-input-wrap{border-top:1px solid #eef0f6;background:#fff}.chat-input{display:flex;align-items:flex-end;gap:10px;padding:14px 20px 18px}.chat-input .ant-input{border-radius:12px;padding:10px 14px;font-size:14px}.attach-btn.ant-btn{height:42px;width:46px;border-radius:12px;color:#6366f1;border-color:#e0e7ff}.chat-input .ant-btn-primary{height:42px;padding:0 22px;border-radius:12px;box-shadow:0 6px 16px #6366f159}.attach-list{display:flex;flex-wrap:wrap;gap:10px;padding:12px 20px 0}.bubble-user .attach-list{padding:0 0 8px}.attach-item{position:relative}.attach-thumb{border-radius:10px;border:1px solid #e5e7f4;object-fit:cover}.bubble-user .attach-thumb{border-color:#ffffff73}.attach-file{display:inline-flex;align-items:center;gap:6px;max-width:200px;padding:8px 12px;border-radius:10px;border:1px solid #e5e7f4;background:#f8f9ff;font-size:12px;color:#4338ca}.bubble-user .attach-file{border-color:#ffffff73;background:#ffffff24;color:#fff}.attach-file-icon{font-size:16px}.attach-file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.attach-remove{position:absolute;top:-6px;right:-6px;font-size:16px;color:#9ca3af;background:#fff;border-radius:50%;cursor:pointer}.attach-remove:hover{color:#ef4444}.message-list::-webkit-scrollbar{width:6px}.message-list::-webkit-scrollbar-thumb{background:#d9dce8;border-radius:3px}