.image-upload-container{margin-bottom:12px}.image-upload-dropzone{border:2px dashed #d1d5db;border-radius:12px;padding:20px;text-align:center;cursor:pointer;transition:all .3s ease;background-color:#f9fafb}.image-upload-dropzone:hover{border-color:#6366f1;background-color:#eef2ff}.image-upload-dropzone.dragging{border-color:#6366f1;background-color:#eef2ff;transform:scale(1.02)}.upload-icon{font-size:2.5rem;margin-bottom:8px}.upload-text{color:#6b7280}.upload-primary{margin:0 0 4px;font-weight:500;color:#374151;font-size:.95rem}.upload-secondary{margin:0;font-size:.85rem;color:#9ca3af}.image-preview{position:relative;border-radius:12px;overflow:hidden;max-width:200px;box-shadow:0 2px 8px #0000001a}.image-preview img{width:100%;height:auto;display:block}.image-preview-overlay{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(to top,rgba(0,0,0,.7),transparent);color:#fff;padding:8px;font-size:.85rem;text-align:center}.remove-image-button{position:absolute;top:8px;right:8px;background-color:#0009;color:#fff;border:none;border-radius:50%;width:28px;height:28px;font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s ease;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.remove-image-button:hover{background-color:#ef4444cc;transform:scale(1.1)}.message-input-image{margin-top:12px;position:relative;border-radius:8px;overflow:hidden;max-width:300px;box-shadow:0 2px 6px #0000001a}.message-input-image img{width:100%;height:auto;display:block}.input-image-label{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(to top,rgba(99,102,241,.8),transparent);color:#fff;padding:6px 10px;font-size:.8rem;text-align:center}*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #4285f4;--primary-hover: #3367d6;--background: #ffffff;--surface: 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8px 12px;border:1px solid var(--border);border-radius:8px;background:var(--background);color:var(--text-primary);font-size:14px;cursor:pointer;outline:none;transition:all .2s;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%235f6368' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}.model-selector select:hover{border-color:var(--primary-color);background-color:var(--surface)}.model-selector select:focus{border-color:var(--primary-color);box-shadow:0 0 0 3px #4285f41a}.model-selector select:disabled{opacity:.6;cursor:not-allowed;background-color:var(--surface)}.model-lock-hint{font-size:12px;color:#6366f1;background:#eef2ff;padding:4px 10px;border-radius:12px;display:inline-flex;align-items:center;gap:4px;font-weight:500}.chat-container{flex:1;overflow-y:auto;padding:24px;background:var(--background)}.messages-list{display:flex;flex-direction:column;gap:24px;max-width:800px;margin:0 auto}.message{display:flex;gap:16px;animation:fadeIn .3s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:18px;font-weight:500}.message.user .message-avatar{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.message.assistant .message-avatar{background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff}.message-content{flex:1;padding-top:2px}.message-text{font-size:15px;line-height:1.6;color:var(--text-primary);white-space:pre-wrap;word-wrap:break-word}.message-image-container{margin-top:12px;display:inline-block;max-width:100%}.message-image{position:relative;border-radius:12px;overflow:hidden;box-shadow:var(--shadow);display:inline-block;max-width:100%;transition:box-shadow .3s ease}.message-image:hover{box-shadow:var(--shadow-hover)}.message-image img{max-width:100%;height:auto;display:block}.download-button{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);padding:12px 20px;background:#000000bf;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);color:#fff;border:2px solid rgba(255,255,255,.3);border-radius:12px;font-size:14px;font-weight:500;cursor:pointer;display:flex;align-items:center;gap:8px;font-family:inherit;opacity:0;transition:all .3s ease;pointer-events:none}.message-image:hover .download-button{opacity:1;pointer-events:auto}.download-button:hover{background:#000000e6;border-color:#ffffff80;transform:translate(-50%,-50%) scale(1.05)}.download-button:active{transform:translate(-50%,-50%) scale(.98)}.download-button svg{flex-shrink:0}.message-time{font-size:12px;color:var(--text-secondary);margin-top:8px}.input-container{border-top:1px solid var(--border);padding:16px 24px;background:var(--background)}.input-wrapper{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:12px}.input-row{display:flex;gap:12px;align-items:flex-end;width:100%}.input-box{flex:1;display:flex;border:1px solid var(--border);border-radius:24px;background:var(--surface);transition:all .2s;padding:4px}.input-box:focus-within{background:var(--background);border-color:var(--primary-color);box-shadow:0 0 0 3px #4285f41a}.input-box textarea{flex:1;border:none;outline:none;background:transparent;padding:12px 16px;font-size:15px;resize:none;max-height:200px;font-family:inherit;color:var(--text-primary)}.input-box textarea::placeholder{color:var(--text-secondary)}.send-button{padding:12px 24px;background:var(--primary-color);color:#fff;border:none;border-radius:20px;font-size:15px;font-weight:500;cursor:pointer;transition:all .2s;white-space:nowrap}.send-button:hover:not(:disabled){background:var(--primary-hover);box-shadow:var(--shadow-hover)}.send-button:disabled{background:var(--border);cursor:not-allowed}.send-button:active:not(:disabled){transform:scale(.98)}.loading{display:flex;gap:8px;padding:16px 0}.loading-dot{width:8px;height:8px;border-radius:50%;background:var(--text-secondary);animation:bounce 1.4s infinite ease-in-out both}.loading-dot:nth-child(1){animation-delay:-.32s}.loading-dot:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-secondary);text-align:center;padding:48px 24px}.empty-state-icon{font-size:64px;margin-bottom:16px;opacity:.5}.empty-state-title{font-size:24px;font-weight:400;margin-bottom:8px;color:var(--text-primary)}.empty-state-description{font-size:15px;max-width:400px}.chat-container::-webkit-scrollbar{width:8px}.chat-container::-webkit-scrollbar-track{background:transparent}.chat-container::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}.chat-container::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}@media (max-width: 768px){.app-header{flex-direction:column;gap:12px;align-items:flex-start}.model-selector{width:100%}.model-selector select{flex:1}.chat-container{padding:16px}.input-row{flex-direction:column}.send-button{width:100%}}