/* ============================================
           用户系统统一样式 - 使用 .user-system 前缀避免冲突
           ============================================ */
        
        /* 基础重置 */
        .user-system * {
            padding: 0;
            box-sizing: border-box;
        }
        
        .user-system {
            font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
            background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
            min-height: 100vh;
            color: #1e293b;
            line-height: 1.6;
        }
        
        /* 容器布局 */
        .user-system .us-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .user-system .us-auth-container {
            max-width: 420px;
            margin: 0 auto;
            padding: 40px 20px;
        }
        
        /* 通用卡片样式 */
        .user-system .us-card {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 16px;
            padding: 32px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
        }
        
        .user-system .us-card:hover {
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
            transform: translateY(-2px);
        }
        
        /* 标题样式 */
        .user-system .us-title {
            font-size: 28px;
            font-weight: 700;
            color: #1e293b;
            text-align: center;
            margin-bottom: 8px;
            letter-spacing: -0.5px;
        }
        
        .user-system .us-subtitle {
            font-size: 16px;
            color: #64748b;
            text-align: center;
            margin-bottom: 32px;
        }
        
        .user-system .us-section-title {
            font-size: 20px;
            font-weight: 600;
            color: #1e293b;
            margin-bottom: 16px;
        }
        
        /* 表单样式 */
        .user-system .us-form {
            width: 100%;
        }
        
        .user-system .us-form-group {
            margin-bottom: 20px;
        }
        
        .user-system .us-form-group:last-child {
            margin-bottom: 0;
        }
        
        .user-system .us-label {
            display: block;
            font-size: 14px;
            font-weight: 500;
            color: #374151;
            margin-bottom: 6px;
        }
        
        .user-system .us-input {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e5e7eb;
            border-radius: 10px;
            font-size: 16px;
            color: #1f2937;
            background: #ffffff;
            transition: all 0.2s ease;
        }
        
        .user-system .us-input:focus {
            outline: none;
            border-color: #1e40af;
            box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
        }
        
        .user-system .us-input::placeholder {
            color: #9ca3af;
        }
        
        /* 验证码输入组合 */
        .user-system .us-code-group {
            display: flex;
            gap: 12px;
        }
        
        .user-system .us-code-input {
            flex: 1;
        }
        
        .user-system .us-code-btn {
            padding: 12px 20px;
            background: #f1f5f9;
            border: 2px solid #e5e7eb;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: #1e40af;
            cursor: pointer;
            transition: all 0.2s ease;
            white-space: nowrap;
        }
        
        .user-system .us-code-btn:hover {
            background: #e2e8f0;
            border-color: #1e40af;
        }
        
        .user-system .us-code-btn:disabled {
            background: #f8fafc;
            color: #9ca3af;
            cursor: not-allowed;
        }
        
        /* 按钮样式 */
        .user-system .us-btn {
            display: inline-block;
            padding: 14px 28px;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            text-align: center;
            text-decoration: none;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
            width: 100%;
        }
        
        .user-system .us-btn-primary {
            background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
            color: white;
        }
        
        .user-system .us-btn-primary:hover {
            background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(30, 64, 175, 0.3);
        }
        
        .user-system .us-btn-secondary {
            background: #f8fafc;
            color: #374151;
            border: 2px solid #e5e7eb;
        }
        
        .user-system .us-btn-secondary:hover {
            background: #f1f5f9;
            border-color: #d1d5db;
        }
        
        .user-system .us-btn-ghost {
            background: transparent;
            color: #1e40af;
            border: 2px solid #1e40af;
        }
        
        .user-system .us-btn-ghost:hover {
            background: #1e40af;
            color: white;
        }
        
        .user-system .us-btn-danger {
            background: #dc2626;
            color: white;
        }
        
        .user-system .us-btn-danger:hover {
            background: #b91c1c;
        }
        
        /* 链接样式 */
        .user-system .us-link {
            color: #1e40af;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s ease;
        }
        
        .user-system .us-link:hover {
            color: #1e3a8a;
            text-decoration: underline;
        }
        
        .user-system .us-text-center {
            text-align: center;
        }
        
        .user-system .us-text-sm {
            font-size: 14px;
        }
        
        .user-system .us-text-gray {
            color: #64748b;
        }
        
        /* 分隔线 */
        .user-system .us-divider {
            display: flex;
            align-items: center;
            margin: 24px 0;
            color: #9ca3af;
            font-size: 14px;
        }
        
        .user-system .us-divider::before,
        .user-system .us-divider::after {
            content: '';
            flex: 1;
            height: 1px;
            background: #e5e7eb;
        }
        
        .user-system .us-divider::before {
            margin-right: 16px;
        }
        
        .user-system .us-divider::after {
            margin-left: 16px;
        }
        
        /* 头像上传 */
        .user-system .us-avatar-upload {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 16px;
            margin-bottom: 24px;
        }
        
        .user-system .us-avatar {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            border: 3px solid #e5e7eb;
            object-fit: cover;
            transition: all 0.2s ease;
        }
        
        .user-system .us-avatar:hover {
            border-color: #1e40af;
        }
        
        .user-system .us-avatar-placeholder {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
            border: 3px solid #e5e7eb;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            color: #9ca3af;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        
        .user-system .us-avatar-placeholder:hover {
            border-color: #1e40af;
            background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
        }
        
        .user-system .us-file-input {
            display: none;
        }
        
        /* 个人中心布局 */
        .user-system .us-profile-layout {
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 32px;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .user-system .us-sidebar {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 16px;
            padding: 24px;
            height: fit-content;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }
        
        .user-system .us-sidebar-nav {
            list-style: none;
        }
        
        .user-system .us-sidebar-nav li {
            margin-bottom: 8px;
        }
        
        .user-system .us-sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 8px;
            color: #64748b;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.2s ease;
        }
        
        .user-system .us-sidebar-nav a:hover,
        .user-system .us-sidebar-nav a.active {
            background: #f1f5f9;
            color: #1e40af;
        }
        
        .user-system .us-main-content {
            background: #ffffff;
            border: 1px solid #e2e8f0;
            border-radius: 16px;
            padding: 32px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }
        
        /* 标签页 */
        .user-system .us-tabs {
            border-bottom: 2px solid #f1f5f9;
            margin-bottom: 32px;
        }
        
        .user-system .us-tab-list {
            display: flex;
            gap: 0;
            list-style: none;
        }
        
        .user-system .us-tab-item {
            padding: 16px 24px;
            border-bottom: 3px solid transparent;
            color: #64748b;
            cursor: pointer;
            font-weight: 500;
            transition: all 0.2s ease;
        }
        
        .user-system .us-tab-item:hover,
        .user-system .us-tab-item.active {
            color: #1e40af;
            border-bottom-color: #1e40af;
        }
        
        .user-system .us-tab-content {
            display: none;
        }
        
        .user-system .us-tab-content.active {
            display: block;
        }
        
        /* 统计卡片 */
        .user-system .us-stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 32px;
        }
        
        .user-system .us-stat-card {
            background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
            border: 1px solid #e2e8f0;
            border-radius: 12px;
            padding: 20px;
            text-align: center;
        }
        
        .user-system .us-stat-number {
            font-size: 24px;
            font-weight: 700;
            color: #1e40af;
            margin-bottom: 4px;
        }
        
        .user-system .us-stat-label {
            font-size: 14px;
            color: #64748b;
            font-weight: 500;
        }
        
        /* 数据表格 */
        .user-system .us-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        
        .user-system .us-table th {
            background: #f8fafc;
            color: #374151;
            font-weight: 600;
            font-size: 14px;
            padding: 16px 12px;
            text-align: left;
            border-bottom: 2px solid #e2e8f0;
        }
        
        .user-system .us-table td {
            padding: 16px 12px;
            border-bottom: 1px solid #f1f5f9;
            color: #374151;
            font-size: 14px;
        }
        
        .user-system .us-table tr:hover {
            background: #f8fafc;
        }
        
        /* 升级计划卡片 */
        .user-system .us-plans-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 24px;
        }
        
        .user-system .us-plan-card {
            background: #ffffff;
            border: 2px solid #e2e8f0;
            border-radius: 16px;
            padding: 28px;
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
        }
        
        .user-system .us-plan-card:hover {
            border-color: #1e40af;
            box-shadow: 0 8px 25px rgba(30, 64, 175, 0.15);
        }
        
        .user-system .us-plan-card.recommended {
            border-color: #1e40af;
            background: linear-gradient(135deg, #fafbff 0%, #f1f5ff 100%);
        }
        
        .user-system .us-plan-badge {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: #1e40af;
            color: white;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }
        
        .user-system .us-plan-name {
            font-size: 20px;
            font-weight: 700;
            color: #1e293b;
            margin-bottom: 8px;
        }
        
        .user-system .us-plan-price {
            font-size: 32px;
            font-weight: 700;
            color: #1e40af;
            margin-bottom: 16px;
        }
        
        .user-system .us-plan-features {
            list-style: none;
            margin-bottom: 24px;
        }
        
        .user-system .us-plan-features li {
            padding: 8px 0;
            color: #64748b;
            font-size: 14px;
        }
        
        .user-system .us-plan-features li::before {
            content: '✓';
            color: #059669;
            font-weight: bold;
            margin-right: 8px;
        }
        
        /* 消息提示 */
        .user-system .us-alert {
            padding: 16px;
            border-radius: 8px;
            margin-bottom: 20px;
            font-size: 14px;
        }
        
        .user-system .us-alert-success {
            background: #f0fdf4;
            color: #166534;
            border: 1px solid #bbf7d0;
        }
        
        .user-system .us-alert-error {
            background: #fef2f2;
            color: #dc2626;
            border: 1px solid #fecaca;
        }
        
        .user-system .us-alert-warning {
            background: #fffbeb;
            color: #d97706;
            border: 1px solid #fed7aa;
        }
        
        .user-system .us-alert-info {
            background: #eff6ff;
            color: #2563eb;
            border: 1px solid #bfdbfe;
        }
        
        /* 响应式设计 */
        @media (max-width: 1024px) {
            .user-system .us-profile-layout {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            
            .user-system .us-plans-grid {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .user-system .us-auth-container {
                padding: 20px;
            }
            
            .user-system .us-card {
                padding: 24px;
            }
            
            .user-system .us-title {
                font-size: 24px;
            }
            
            .user-system .us-subtitle {
                font-size: 14px;
            }
            
            .user-system .us-code-group {
                flex-direction: column;
            }
            
            .user-system .us-code-btn {
                width: 100%;
            }
            
            .user-system .us-stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .user-system .us-main-content {
                padding: 20px;
            }
            
            .user-system .us-tab-list {
                flex-wrap: wrap;
                gap: 8px;
            }
            
            .user-system .us-tab-item {
                padding: 12px 16px;
                font-size: 14px;
            }
        }
        
        @media (max-width: 480px) {
            .user-system .us-stats-grid {
                grid-template-columns: 1fr;
            }
            
            .user-system .us-table {
                font-size: 12px;
            }
            
            .user-system .us-table th,
            .user-system .us-table td {
                padding: 8px 6px;
            }
        }
        
        /* 实用工具类 */
        .user-system .us-mt-1 { margin-top: 4px; }
        .user-system .us-mt-2 { margin-top: 8px; }
        .user-system .us-mt-3 { margin-top: 16px; }
        .user-system .us-mt-4 { margin-top: 24px; }
        .user-system .us-mt-5 { margin-top: 32px; }
        
        .user-system .us-mb-1 { margin-bottom: 4px; }
        .user-system .us-mb-2 { margin-bottom: 8px; }
        .user-system .us-mb-3 { margin-bottom: 16px; }
        .user-system .us-mb-4 { margin-bottom: 24px; }
        .user-system .us-mb-5 { margin-bottom: 32px; }
        
        .user-system .us-p-1 { padding: 4px; }
        .user-system .us-p-2 { padding: 8px; }
        .user-system .us-p-3 { padding: 16px; }
        .user-system .us-p-4 { padding: 24px; }
        .user-system .us-p-5 { padding: 32px; }
        
        .user-system .us-flex { display: flex; }
        .user-system .us-flex-col { flex-direction: column; }
        .user-system .us-items-center { align-items: center; }
        .user-system .us-justify-between { justify-content: space-between; }
        .user-system .us-gap-1 { gap: 4px; }
        .user-system .us-gap-2 { gap: 8px; }
        .user-system .us-gap-3 { gap: 16px; }
        .user-system .us-gap-4 { gap: 24px; }
        
        .user-system .us-hidden { display: none; }
        .user-system .us-block { display: block; }
        .user-system .us-inline-block { display: inline-block; }
        
        .user-system .us-w-full { width: 100%; }
        .user-system .us-h-full { height: 100%; }
        
        .user-system .us-text-left { text-align: left; }
        .user-system .us-text-center { text-align: center; }
        .user-system .us-text-right { text-align: right; }
        
        .user-system .us-font-bold { font-weight: 700; }
        .user-system .us-font-semibold { font-weight: 600; }
        .user-system .us-font-medium { font-weight: 500; }
        
        .user-system .us-text-xs { font-size: 12px; }
        .user-system .us-text-sm { font-size: 14px; }
        .user-system .us-text-base { font-size: 16px; }
        .user-system .us-text-lg { font-size: 18px; }
        .user-system .us-text-xl { font-size: 20px; }
        .user-system .us-text-2xl { font-size: 24px; }
        
        .user-system .us-text-gray-400 { color: #9ca3af; }
        .user-system .us-text-gray-500 { color: #6b7280; }
        .user-system .us-text-gray-600 { color: #4b5563; }
        .user-system .us-text-gray-700 { color: #374151; }
        .user-system .us-text-blue-600 { color: #2563eb; }
        .user-system .us-text-green-600 { color: #059669; }
        .user-system .us-text-red-600 { color: #dc2626; }
        
        .user-system .us-bg-white { background-color: #ffffff; }
        .user-system .us-bg-gray-50 { background-color: #f9fafb; }
        .user-system .us-bg-gray-100 { background-color: #f3f4f6; }
        .user-system .us-bg-blue-50 { background-color: #eff6ff; }
        .user-system .us-bg-green-50 { background-color: #f0fdf4; }
        .user-system .us-bg-red-50 { background-color: #fef2f2; }
        
        .user-system .us-border { border: 1px solid #e5e7eb; }
        .user-system .us-border-t { border-top: 1px solid #e5e7eb; }
        .user-system .us-border-b { border-bottom: 1px solid #e5e7eb; }
        .user-system .us-border-l { border-left: 1px solid #e5e7eb; }
        .user-system .us-border-r { border-right: 1px solid #e5e7eb; }
        
        .user-system .us-rounded { border-radius: 4px; }
        .user-system .us-rounded-md { border-radius: 6px; }
        .user-system .us-rounded-lg { border-radius: 8px; }
        .user-system .us-rounded-xl { border-radius: 12px; }
        .user-system .us-rounded-2xl { border-radius: 16px; }
        .user-system .us-rounded-full { border-radius: 9999px; }
        
        .user-system .us-shadow-sm { box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05); }
        .user-system .us-shadow { box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06); }
        .user-system .us-shadow-md { box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06); }
        .user-system .us-shadow-lg { box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05); }
        
        /* 加载动画 */
        .user-system .us-loading {
            display: inline-block;
            width: 16px;
            height: 16px;
            border: 2px solid #f3f4f6;
            border-radius: 50%;
            border-top-color: #1e40af;
            animation: us-spin 1s ease-in-out infinite;
        }
        
        @keyframes us-spin {
            to { transform: rotate(360deg); }
        }