/* ===== 404页面独享CSS部分 ===== */
        
        /* 404内容区域样式 */
        .error-page {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 0 80px;
            position: relative;
            overflow: hidden;
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
        }
        
        .error-container {
            text-align: center;
            max-width: 800px;
            width: 100%;
            padding: 0 20px;
        }
        
        .error-code {
            font-size: 180px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 20px;
            line-height: 1;
            text-shadow: 5px 5px 0 rgba(13, 33, 69, 0.1);
            position: relative;
            display: inline-block;
            opacity: 0;
            transform: scale(0.8);
            transition: all 0.8s ease;
        }
        
        .error-code.visible {
            opacity: 1;
            transform: scale(1);
        }
        
        .error-code::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 10px;
            bottom: 20px;
            left: 0;
            background: linear-gradient(to right, transparent, var(--secondary), transparent);
            border-radius: 5px;
            animation: pulseLine 2s ease-in-out infinite;
        }
        
        @keyframes pulseLine {
            0%, 100% {
                opacity: 0.5;
                transform: scaleX(0.8);
            }
            50% {
                opacity: 1;
                transform: scaleX(1);
            }
        }
        
        .error-title {
            font-size: 36px;
            color: var(--primary);
            margin-bottom: 25px;
            font-weight: 600;
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease 0.3s;
        }
        
        .error-title.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        .error-message {
            font-size: 18px;
            color: var(--gray);
            margin-bottom: 40px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease 0.5s;
        }
        
        .error-message.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        .error-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease 0.7s;
        }
        
        .error-actions.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
            box-shadow: none;
        }
        
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }
        
        .error-icon {
            font-size: 100px;
            color: var(--secondary);
            margin-bottom: 30px;
            animation: float 3s ease-in-out infinite;
            opacity: 0;
            transform: scale(0.8);
            transition: all 0.8s ease 0.1s;
        }
        
        .error-icon.visible {
            opacity: 1;
            transform: scale(1);
        }
        
        @keyframes float {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-15px);
            }
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .mobile-menu {
                display: block;
            }
            
            nav ul {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background: rgba(13, 33, 69, 0.98);
                flex-direction: column;
                align-items: center;
                justify-content: flex-start;
                padding-top: 50px;
                transition: left 0.5s ease;
                backdrop-filter: blur(10px);
            }
            
            nav ul.active {
                left: 0;
            }
            
            nav ul li {
                margin: 20px 0;
            }
            
            .error-code {
                font-size: 120px;
            }
            
            .error-title {
                font-size: 28px;
            }
            
            .error-message {
                font-size: 16px;
            }
        }
        
        @media (max-width: 576px) {
            .error-code {
                font-size: 100px;
            }
            
            .error-title {
                font-size: 24px;
            }
            
            .error-message {
                font-size: 15px;
            }
            
            .error-icon {
                font-size: 80px;
            }
            
            .btn {
                padding: 12px 24px;
                font-size: 14px;
            }
        }