:root {
            --primary: #2c6fbb;
            --secondary: #e74c3c;
            --success: #27ae60;
            --light: #f8f9fa;
            --dark: #343a40;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --border: #dee2e6;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, #1a3a6c, #2c6fbb);
            color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .top-bar {
            background-color: rgba(0,0,0,0.15);
            padding: 8px 0;
            font-size: 13px;
        }
        
        .top-bar-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .top-links {
            display: flex;
            gap: 20px;
        }
        
        .top-links a {
            color: rgba(255,255,255,0.85);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .top-links a:hover {
            color: white;
        }
        
        .top-links i {
            margin-right: 5px;
        }
        
        .header-main {
            padding: 15px 0;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .logo {
            color: white;
            font-size: 24px;
            font-weight: bold;
            text-decoration: none;
        }
        
        .logo span {
            color: #ffcc00;
        }
        
        .user-actions {
            display: flex;
            gap: 10px;
        }
        
        .btn {
            padding: 8px 15px;
            border-radius: 4px;
            text-decoration: none;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            transition: all 0.3s;
        }
        
        .btn i {
            margin-right: 8px;
        }
        
        .btn-primary {
            background-color: var(--primary);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: #235a9e;
        }
        
        .btn-contribute {
            background-color: var(--success);
            color: white;
        }
        
        .btn-contribute:hover {
            background-color: #219653;
        }
        
        /* 面包屑导航 */
        .breadcrumb {
            padding: 15px 0;
            font-size: 14px;
            color: var(--gray);
        }
        
        .breadcrumb a {
            color: var(--gray);
            text-decoration: none;
        }
        
        .breadcrumb a:hover {
            color: var(--primary);
            text-decoration: underline;
        }
        
        .breadcrumb span {
            color: var(--primary);
            font-weight: 500;
        }
        
        /* 主要内容 */
        .main-content {
            display: flex;
            gap: 30px;
            margin: 20px 0 40px;
        }
        
        .resource-container {
            flex: 1;
            background: white;
            border-radius: 8px;
            box-shadow: var(--shadow);
            padding: 30px;
        }
        
        .resource-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 25px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
        }
        
        .resource-title {
            font-size: 24px;
            color: var(--dark);
            margin-bottom: 10px;
        }
        
        .resource-meta {
            display: flex;
            gap: 20px;
            font-size: 14px;
            color: var(--gray);
        }
        
        .resource-meta span {
            display: flex;
            align-items: center;
        }
        
        .resource-meta i {
            margin-right: 5px;
            color: var(--primary);
        }
        
        .download-section {
            text-align: center;
            padding: 30px;
            background: #f8fafd;
            border-radius: 8px;
            margin: 30px 0;
            border: 1px dashed var(--primary);
            position: relative;
        }
        
        .download-section h3 {
            color: var(--primary);
            margin-bottom: 25px;
            font-size: 22px;
        }
        
        .download-badge {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--secondary);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: bold;
        }
        
        .btn-download {
            background: linear-gradient(135deg, var(--primary), #1a3a6c);
            color: white;
            padding: 14px 40px;
            font-size: 18px;
            font-weight: bold;
            border-radius: 50px;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(44, 111, 187, 0.3);
        }
        
        .btn-download:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(44, 111, 187, 0.4);
        }
        
        .btn-download i {
            margin-right: 10px;
            font-size: 24px;
        }
        
        .alternate-link {
            margin-top: 20px;
            font-size: 15px;
        }
        
        .alternate-link a {
            color: var(--primary);
            text-decoration: none;
        }
        
        .alternate-link a:hover {
            text-decoration: underline;
        }
        
        .file-info {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        
        .info-card {
            background: #f8fafd;
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 20px;
            text-align: center;
        }
        
        .info-card i {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .info-card .label {
            font-size: 14px;
            color: var(--gray);
            margin-bottom: 5px;
        }
        
        .info-card .value {
            font-size: 18px;
            font-weight: 600;
            color: var(--dark);
        }
        
        .warning-box {
            background: #fff8e1;
            border-left: 4px solid #ffc107;
            padding: 20px;
            border-radius: 4px;
            margin: 30px 0;
        }
        
        .warning-box h4 {
            color: #d39e00;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }
        
        .warning-box h4 i {
            margin-right: 10px;
        }
        
        .warning-box ul {
            padding-left: 20px;
            margin: 15px 0;
        }
        
        .warning-box li {
            margin-bottom: 8px;
        }
        
        .sidebar {
            width: 300px;
        }
        
        .sidebar-card {
            background: white;
            border-radius: 8px;
            box-shadow: var(--shadow);
            padding: 20px;
            margin-bottom: 25px;
        }
        
        .sidebar-card h3 {
            color: var(--primary);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border);
            font-size: 18px;
        }
        
        .category-list {
            list-style: none;
        }
        
        .category-list li {
            margin-bottom: 12px;
        }
        
        .category-list a {
            display: flex;
            align-items: center;
            color: var(--dark);
            text-decoration: none;
            padding: 8px;
            border-radius: 4px;
            transition: all 0.3s;
        }
        
        .category-list a:hover {
            background: var(--light);
            color: var(--primary);
            padding-left: 12px;
        }
        
        .category-list i {
            margin-right: 10px;
            width: 24px;
            text-align: center;
            color: var(--primary);
        }
        
        .qr-section {
            text-align: center;
            padding: 20px;
            background: #f8fafd;
            border-radius: 8px;
            margin-top: 30px;
        }
        
        .qr-section h4 {
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .qr-code {
            width: 160px;
            height: 160px;
            background: #e9ecef;
            margin: 0 auto 15px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
        }
        
        .qr-code i {
            font-size: 60px;
            color: var(--gray);
        }
        
        /* 页脚样式 */
        footer {
            background: var(--dark);
            color: rgba(255,255,255,0.7);
            padding: 40px 0 20px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 30px;
        }
        
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        
        .footer-section h4 {
            color: white;
            margin-bottom: 20px;
            font-size: 18px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-section h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background: var(--primary);
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            transition: color 0.3s;
            display: flex;
            align-items: center;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .footer-links i {
            margin-right: 10px;
            width: 20px;
            text-align: center;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            margin-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .main-content {
                flex-direction: column;
            }
            
            .sidebar {
                width: 100%;
            }
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 15px;
            }
            
            .resource-header {
                flex-direction: column;
                gap: 15px;
            }
            
            .resource-meta {
                flex-wrap: wrap;
                gap: 10px;
            }
            
            .file-info {
                grid-template-columns: 1fr;
            }
            
            .top-bar-content {
                flex-direction: column;
                gap: 10px;
            }
        }

		 .search-box {
            flex: 1;
            max-width: 500px;
            margin: 0 30px;
            position: relative;
        }
        
        .search-box input {
            width: 100%;
            padding: 12px 20px;
            border-radius: 30px;
            border: none;
            font-size: 16px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .search-box button {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            background: var(--secondary);
            border: none;
            color: white;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            cursor: pointer;
            transition: background 0.3s;
        }
        
        .search-box button:hover {
            background: #1e5a80;
        }
        
        .user-actions {
            display: flex;
            align-items: center;
            gap: 10px;
        }