/* 独享CSS - 404页面部分 */
        
        /* 404页面主体 */
        .not-found-section {
            min-height: calc(100vh - 160px);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 0 60px;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            position: relative;
            overflow: hidden;
        }
        
        .not-found-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%231a3a5f" fill-opacity="0.05" d="M0,128L48,117.3C96,107,192,85,288,101.3C384,117,480,171,576,170.7C672,171,768,117,864,101.3C960,85,1056,107,1152,122.7C1248,139,1344,149,1392,154.7L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>');
            background-size: cover;
            background-position: center;
        }
        
        .not-found-content {
            text-align: center;
            max-width: 700px;
            padding: 40px;
            background: white;
            border-radius: 15px;
            box-shadow: var(--shadow-heavy);
            position: relative;
            z-index: 1;
            opacity: 0;
            transform: translateY(30px);
            transition: all 0.8s ease;
        }
        
        .not-found-content.animate {
            opacity: 1;
            transform: translateY(0);
        }
        
        .error-code {
            font-size: 120px;
            font-weight: 800;
            background: var(--gradient);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1;
            margin-bottom: 20px;
            position: relative;
            display: inline-block;
        }
        
        .error-code::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 5px;
            background: var(--gradient-accent);
            border-radius: 5px;
        }
        
        .error-title {
            font-size: 32px;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        
        .error-description {
            font-size: 18px;
            color: #666;
            margin-bottom: 30px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .error-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: var(--gradient-accent);
            color: white;
            text-decoration: none;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: var(--shadow);
            position: relative;
            overflow: hidden;
        }
        
        .btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
            transition: left 0.5s;
        }
        
        .btn:hover::before {
            left: 100%;
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }
        
        .btn-secondary {
            background: transparent;
            color: var(--primary-color);
            border: 2px solid var(--primary-color);
        }
        
        .btn-secondary:hover {
            background: var(--primary-color);
            color: white;
        }
        
        .error-illustration {
            margin-top: 40px;
            position: relative;
            height: 200px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .error-illustration i {
            font-size: 150px;
            color: var(--accent-color);
            opacity: 0.7;
            animation: float 3s ease-in-out infinite;
        }
        
        @keyframes float {
            0% {
                transform: translateY(0px);
            }
            50% {
                transform: translateY(-15px);
            }
            100% {
                transform: translateY(0px);
            }
        }
        
        /* 响应式设计 - 404页面 */
        @media (max-width: 768px) {
            .error-code {
                font-size: 80px;
            }
            
            .error-title {
                font-size: 24px;
            }
            
            .error-description {
                font-size: 16px;
            }
            
            .error-actions {
                flex-direction: column;
                align-items: center;
            }
            
            .btn {
                width: 100%;
                max-width: 250px;
            }
            
            .error-illustration i {
                font-size: 100px;
            }
        }