/* 基础样式 */
        :root {
            --primary-color: #4f46e5;
            --secondary-color: #6b7280;
            --accent-color: #10b981;
            --light-gray: #f3f4f6;
            --medium-gray: #e5e7eb;
            --dark-gray: #6b7280;
            --text-color: #111827;
            --text-light: #6b7280;
            --white: #ffffff;
            --black: #000000;
            --success: #10b981;
            --warning: #f59e0b;
            --danger: #ef4444;
            --info: #3b82f6;
        }

        body {
            font-family: 'Inter', 'Noto Sans SC', sans-serif;
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--light-gray);
            margin: 0;
            padding: 0;
        }

        /* 布局容器 */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 响应式网格系统 */
        .grid {
            display: grid;
            gap: 20px;
        }

        .grid-cols-1 {
            grid-template-columns: repeat(1, 1fr);
        }

        .grid-cols-2 {
            grid-template-columns: repeat(2, 1fr);
        }

        .grid-cols-3 {
            grid-template-columns: repeat(3, 1fr);
        }

        .grid-cols-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        @media (max-width: 768px) {
            .grid-cols-2, .grid-cols-3, .grid-cols-4 {
                grid-template-columns: repeat(1, 1fr);
            }
        }

        /* 导航栏 */
        .navbar {
            background-color: var(--white);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .navbar-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .navbar-brand {
            font-size: 18px;
            font-weight: 600;
            color: var(--primary-color);
            text-decoration: none;
        }

        .navbar-menu {
            display: flex;
            gap: 20px;
        }

        .navbar-item {
            font-size: 18px;
            color: var(--dark-gray);
            text-decoration: none;
            transition: color 0.3s;
        }

        .navbar-item:hover {
            color: var(--primary-color);
        }

        .navbar-toggler {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--dark-gray);
            cursor: pointer;
        }

        @media (max-width: 768px) {
            .navbar-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--white);
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            }
            
            .navbar-menu.active {
                display: flex;
            }
            
            .navbar-toggler {
                display: block;
            }
        }

        /* 卡片组件 */
        .card {
            background-color: var(--white);
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        .card-img {
            width: 100%;
            height: 300px;
            object-fit: cover;
        }

        .card-body {
            padding: 20px;
        }

        .card-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .card-text {
            color: var(--text-light);
            margin-bottom: 15px;
        }

        /* 轮播图 */
        .carousel {
            position: relative;
            width: 100%;
            height: 500px;
            overflow: hidden;
            border-radius: 8px;
        }

        .carousel-inner {
            display: flex;
            transition: transform 0.5s ease;
            height: 100%;
        }

        .carousel-item {
            min-width: 100%;
            height: 100%;
        }

        .carousel-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .carousel-control {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background-color: rgba(0, 0, 0, 0.5);
            color: white;
            border: none;
            padding: 10px 15px;
            border-radius: 50%;
            cursor: pointer;
            z-index: 10;
        }

        .carousel-control.prev {
            left: 20px;
        }

        .carousel-control.next {
            right: 20px;
        }

        .carousel-indicators {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 10px;
        }

        .carousel-indicator {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.5);
            cursor: pointer;
        }

        .carousel-indicator.active {
            background-color: white;
        }

        /* 按钮 */
        .btn {
            display: inline-block;
            padding: 10px 20px;
            border-radius: 6px;
            font-weight: 500;
            text-align: center;
            text-decoration: none;
            cursor: pointer;
            transition: all 0.3s;
            border: none;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }

        .btn-primary:hover {
            background-color: #4338ca;
        }

        .btn-secondary {
            background-color: var(--secondary-color);
            color: white;
        }

        .btn-secondary:hover {
            background-color: #4b5563;
        }

        .btn-outline {
            background-color: transparent;
            border: 1px solid var(--medium-gray);
            color: var(--text-color);
        }

        .btn-outline:hover {
            background-color: var(--light-gray);
        }

        /* 页脚 */
        .footer {
            background-color: var(--white);
            padding: 40px 0;
            margin-top: 60px;
        }

        .footer-links {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 30px;
        }

        .footer-column {
            flex: 1;
            min-width: 200px;
        }

        .footer-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 20px;
        }

        .footer-link {
            display: block;
            color: var(--text-light);
            margin-bottom: 10px;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-link:hover {
            color: var(--primary-color);
        }

        .footer-bottom {
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px solid var(--medium-gray);
            text-align: center;
            color: var(--text-light);
        }

        /* 实用工具类 */
        .text-center {
            text-align: center;
        }

        .text-primary {
            color: var(--primary-color);
        }

        .text-secondary {
            color: var(--secondary-color);
        }

        .text-success {
            color: var(--success);
        }

        .text-warning {
            color: var(--warning);
        }

        .text-danger {
            color: var(--danger);
        }

        .text-info {
            color: var(--info);
        }

        .bg-primary {
            background-color: var(--primary-color);
        }

        .bg-secondary {
            background-color: var(--secondary-color);
        }

        .bg-light {
            background-color: var(--light-gray);
        }

        .bg-white {
            background-color: var(--white);
        }

        .py-20 {
            padding-top: 80px;
            padding-bottom: 80px;
        }

        .my-20 {
            margin-top: 80px;
            margin-bottom: 80px;
        }

        .shadow-sm {
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
        }

        .shadow-md {
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .shadow-lg {
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        }

        .rounded {
            border-radius: 6px;
        }

        .rounded-lg {
            border-radius: 12px;
        }

        /* 动画 */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .fade-in {
            animation: fadeIn 0.5s ease-in;
        }

        /* 表单元素 */
        .form-group {
            margin-bottom: 20px;
        }

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 10px 15px;
            border: 1px solid var(--medium-gray);
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary-color);
        }

        /* 提示框 */
        .alert {
            padding: 15px;
            border-radius: 6px;
            margin-bottom: 20px;
        }

        .alert-primary {
            background-color: rgba(79, 70, 229, 0.1);
            color: var(--primary-color);
            border-left: 4px solid var(--primary-color);
        }

        .alert-success {
            background-color: rgba(16, 185, 129, 0.1);
            color: var(--success);
            border-left: 4px solid var(--success);
        }

        .alert-warning {
            background-color: rgba(245, 158, 11, 0.1);
            color: var(--warning);
            border-left: 4px solid var(--warning);
        }

        .alert-danger {
            background-color: rgba(239, 68, 68, 0.1);
            color: var(--danger);
            border-left: 4px solid var(--danger);
        }

        /* 加载指示器 */
        .spinner {
            display: inline-block;
            width: 40px;
            height: 40px;
            border: 4px solid rgba(0, 0, 0, 0.1);
            border-radius: 50%;
            border-top-color: var(--primary-color);
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        /* 响应式断点 */
        @media (max-width: 768px) {
            .navbar-brand {
                font-size: 16px;
            }
            
            .carousel {
                height: 300px;
            }
            
            .footer-column {
                flex: 100%;
            }
        }

        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            
            .carousel {
                height: 250px;
            }
        }