/* 404页面内容 */
        .error-content {
            text-align: center;
            padding: 120px 0 80px;
        }
        
        .error-code {
            font-size: 160px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 30px;
            text-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
        }
        
        .error-title {
            font-size: 36px;
            color: var(--dark);
            margin-bottom: 20px;
            font-weight: 700;
        }
        
        .error-message {
            font-size: 18px;
            color: var(--gray);
            max-width: 600px;
            margin: 0 auto 40px;
            line-height: 1.6;
        }
        
        .error-search {
            max-width: 500px;
            margin: 0 auto 40px;
            position: relative;
        }
        
        .error-search input {
            width: 100%;
            padding: 15px 20px;
            border: 2px solid var(--light-gray);
            border-radius: 50px;
            font-size: 16px;
            transition: var(--transition);
        }
        
        .error-search input:focus {
            outline: none;
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0, 192, 255, 0.2);
        }
        
        .error-search button {
            position: absolute;
            right: 5px;
            top: 5px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 50px;
            padding: 10px 25px;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .error-search button:hover {
            background: var(--accent);
        }
        
        .quick-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-top: 60px;
        }
        
        .quick-link-card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            text-align: left;
        }
        
        .quick-link-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-hover);
        }
        
        .quick-link-card i {
            font-size: 40px;
            color: var(--accent);
            margin-bottom: 20px;
        }
        
        .quick-link-card h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .quick-link-card p {
            color: var(--gray);
            margin-bottom: 20px;
        }
        
        /* 页脚 */
        .footer {
            background: var(--dark);
            color: white;
            padding-top: 80px;
            position: relative;
        }
        
        .footer:before {
            content: '';
            position: absolute;
            top: -100px;
            right: -100px;
            width: 300px;
            height: 300px;
            background: rgba(0, 192, 255, 0.05);
            border-radius: 50%;
            z-index: 0;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 60px;
            position: relative;
            z-index: 1;
        }
        
        .footer-column h3 {
            font-size: 22px;
            margin-bottom: 30px;
            position: relative;
            padding-bottom: 15px;
            font-weight: 700;
        }
        
        .footer-column h3:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }
        
        .footer-links li i {
            margin-right: 12px;
            color: var(--accent);
            width: 20px;
            text-align: center;
        }
        
        .footer-links a {
            color: #ddd;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--accent);
            padding-left: 5px;
        }
        
        .footer-about p {
            color: #bbb;
            margin-bottom: 25px;
            line-height: 1.8;
        }
        
        .qr-container {
            display: flex;
            align-items: center;
            gap: 20px;
        }
        
        .qr-code {
            background: white;
            padding: 10px;
            border-radius: 8px;
            display: inline-block;
        }
        
        .qr-code img {
            width: 120px;
            height: 120px;
            display: block;
        }
        
        .qr-text {
            color: #bbb;
            font-size: 14px;
            max-width: 150px;
        }
        
        .footer-bottom {
            background: rgba(0, 0, 0, 0.2);
            padding: 25px 0;
            text-align: center;
            color: #aaa;
            font-size: 15px;
            position: relative;
            z-index: 1;
        }
        
        .friend-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 20px;
        }
        
        .friend-links a {
            color: #aaa;
            transition: var(--transition);
        }
        
        .friend-links a:hover {
            color: var(--accent);
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .nav-menu {
                display: none;
            }
            
            .error-code {
                font-size: 120px;
            }
            
            .error-title {
                font-size: 28px;
            }
        }
        
        @media (max-width: 768px) {
            .section {
                padding: 80px 0;
            }
            
            .error-code {
                font-size: 100px;
            }
            
            .error-title {
                font-size: 24px;
            }
            
            .error-message {
                font-size: 16px;
            }
        }
        
        @media (max-width: 576px) {
            .error-code {
                font-size: 80px;
            }
            
            .logo h1 {
                font-size: 22px;
            }
            
            .quick-links {
                grid-template-columns: 1fr;
            }