:root{--bg-primary: #ffffff;--bg-secondary: #f7f7f8;--bg-tertiary: #ececf1;--bg-sidebar: #f9fafb;--bg-input: #ffffff;--bg-hover: #f0f0f5;--bg-active: #e8e8f0;--bg-message-user: #f7f7f8;--bg-message-ai: #ffffff;--bg-code: #1e1e2e;--bg-overlay: rgba(0, 0, 0, .4);--bg-settings: #ffffff;--bg-badge: #e8e8f0;--text-primary: #1a1a2e;--text-secondary: #6b7280;--text-tertiary: #9ca3af;--text-inverse: #ffffff;--text-code: #e2e8f0;--border-color: #e5e7eb;--border-light: #f0f0f5;--accent: #6366f1;--accent-hover: #5558e6;--accent-light: #eef0ff;--danger: #ef4444;--danger-hover: #dc2626;--success: #22c55e;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -2px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -4px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1), 0 8px 10px -6px rgba(0, 0, 0, .1);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--sidebar-width: 280px;--transition: .2s ease}.dark{--bg-primary: #0f0f1a;--bg-secondary: #1a1a2e;--bg-tertiary: #252540;--bg-sidebar: #12121f;--bg-input: #1a1a2e;--bg-hover: #252540;--bg-active: #2d2d4a;--bg-message-user: #1a1a2e;--bg-message-ai: #12121f;--bg-code: #0d0d15;--bg-overlay: rgba(0, 0, 0, .6);--bg-settings: #1a1a2e;--bg-badge: #252540;--text-primary: #e2e8f0;--text-secondary: #94a3b8;--text-tertiary: #64748b;--text-inverse: #ffffff;--text-code: #e2e8f0;--border-color: #2d2d4a;--border-light: #252540;--accent: #818cf8;--accent-hover: #6366f1;--accent-light: #1e1b4b;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .4);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .5)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.6;overflow:hidden;height:100vh}#app{height:100vh}.app-root{display:flex;height:100vh;overflow:hidden;background:var(--bg-primary)}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--text-tertiary);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border-color);display:flex;flex-direction:column;transition:width var(--transition),min-width var(--transition);overflow:hidden}.sidebar.collapsed{width:56px;min-width:56px}.sidebar-header{display:flex;align-items:center;gap:10px;padding:16px;border-bottom:1px solid var(--border-light);flex-shrink:0}.sidebar-title{font-size:1.1rem;font-weight:700;color:var(--text-primary);flex:1;white-space:nowrap}.btn-icon{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border:none;background:transparent;color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-sm);transition:all var(--transition);flex-shrink:0}.btn-icon:hover{background:var(--bg-hover);color:var(--text-primary)}.btn-icon svg{width:20px;height:20px}.btn-new:hover{color:var(--accent)}.conversation-list{flex:1;overflow-y:auto;padding:8px}.conversation-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);margin-bottom:2px;position:relative}.conversation-item:hover{background:var(--bg-hover)}.conversation-item.active{background:var(--bg-active)}.conv-icon{flex-shrink:0;width:20px;height:20px;color:var(--text-tertiary)}.conv-icon svg{width:20px;height:20px}.conv-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.conv-title{font-size:.875rem;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv-time{font-size:.75rem;color:var(--text-tertiary)}.btn-delete{opacity:0;width:28px;height:28px;transition:all var(--transition)}.btn-delete svg{width:16px;height:16px}.conversation-item:hover .btn-delete{opacity:1}.btn-delete:hover{color:var(--danger)!important;background:transparent!important}.btn-delete.confirm{opacity:1;color:var(--danger)!important}.empty-hint{text-align:center;color:var(--text-tertiary);font-size:.85rem;padding:32px 16px}.sidebar-footer{padding:8px;border-top:1px solid var(--border-light);flex-shrink:0}.btn-footer{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border:none;background:transparent;color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-md);font-size:.875rem;transition:all var(--transition)}.btn-footer:hover{background:var(--bg-hover);color:var(--text-primary)}.btn-footer svg{width:20px;height:20px;flex-shrink:0}.chat-view{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--bg-primary);position:relative}.chat-header{display:flex;align-items:center;gap:12px;padding:12px 20px;border-bottom:1px solid var(--border-light);flex-shrink:0;background:var(--bg-primary);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.chat-header h2{font-size:1rem;font-weight:600;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-actions{display:flex;align-items:center;gap:8px}.model-selector{position:relative}.model-trigger{display:flex;align-items:center;gap:6px;padding:6px 12px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);color:var(--text-primary);cursor:pointer;font-size:.85rem;font-family:inherit;transition:all var(--transition);white-space:nowrap}.model-trigger:hover{background:var(--bg-hover);border-color:var(--accent)}.model-icon{width:16px;height:16px;color:var(--accent);flex-shrink:0}.chevron{width:14px;height:14px;color:var(--text-tertiary);transition:transform var(--transition);flex-shrink:0}.chevron.open{transform:rotate(180deg)}.model-dropdown{position:absolute;top:calc(100% + 6px);right:0;min-width:220px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:200;padding:4px;animation:fadeIn .15s ease;max-height:400px;overflow-y:auto}.model-option{display:flex;align-items:center;justify-content:space-between;width:100%;padding:10px 12px;border:none;background:transparent;color:var(--text-primary);cursor:pointer;border-radius:var(--radius-sm);font-size:.875rem;font-family:SF Mono,Fira Code,JetBrains Mono,Consolas,monospace;transition:all var(--transition);text-align:left}.model-option:hover{background:var(--bg-hover)}.model-option.active{background:var(--accent-light);color:var(--accent)}.model-name{flex:1}.check-icon{width:16px;height:16px;color:var(--accent);flex-shrink:0}.welcome-screen{flex:1;display:flex;align-items:center;justify-content:center}.welcome-content{text-align:center;max-width:400px;padding:32px}.welcome-icon{width:80px;height:80px;margin:0 auto 24px;color:var(--accent);opacity:.8}.welcome-icon svg{width:80px;height:80px}.welcome-content h1{font-size:1.75rem;font-weight:700;margin-bottom:8px;color:var(--text-primary)}.welcome-content p{color:var(--text-secondary);margin-bottom:24px;font-size:.95rem}.btn-welcome{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;background:var(--accent);color:var(--text-inverse);border:none;border-radius:var(--radius-lg);font-size:1rem;font-weight:500;cursor:pointer;transition:all var(--transition);box-shadow:var(--shadow-md)}.btn-welcome:hover{background:var(--accent-hover);box-shadow:var(--shadow-lg);transform:translateY(-1px)}.btn-welcome svg{width:20px;height:20px}.messages-area{flex:1;overflow-y:auto;padding:16px 0}.empty-chat{display:flex;align-items:center;justify-content:center;height:100%;color:var(--text-tertiary);font-size:.95rem}.message-bubble{display:flex;gap:16px;padding:20px 24px;max-width:860px;margin:0 auto;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.message-bubble.user{background:var(--bg-message-user)}.message-avatar{width:32px;height:32px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;flex-shrink:0;background:var(--bg-tertiary);color:var(--text-secondary)}.message-bubble.assistant .message-avatar{background:var(--accent-light);color:var(--accent)}.message-avatar svg{width:20px;height:20px}.message-content{flex:1;min-width:0;overflow-wrap:break-word;display:flex;flex-direction:column;gap:12px}.user-text{white-space:pre-wrap;line-height:1.7}.message-attachments{display:grid;gap:10px}.message-attachment{display:flex;align-items:center;gap:12px;padding:12px;border:1px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-input)}.message-attachment.detached{border-style:dashed}.message-attachment-preview{width:72px;height:72px;border-radius:var(--radius-sm);overflow:hidden;flex-shrink:0;background:var(--bg-secondary)}.message-attachment-preview img{width:100%;height:100%;object-fit:cover;display:block}.message-attachment-preview.placeholder{display:flex;align-items:center;justify-content:center;color:var(--text-tertiary)}.message-attachment-preview.placeholder 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