/* ========== 独享CSS部分 - 404页面 ========== */
        
        /* 404主区域 */
        .not-found-section {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 80px 0;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            position: relative;
            overflow: hidden;
        }
        
        .not-found-section:before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 40%;
            height: 100%;
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            opacity: 0.05;
            clip-path: polygon(100% 0, 0% 100%, 100% 100%);
        }
        
        /* 404内容容器 - 水平居中 */
        .not-found-container {
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }
        
        /* 404数字动画 */
        .error-code {
            font-size: 10rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 20px;
            position: relative;
            display: inline-block;
            animation: float404 3s ease-in-out infinite;
            text-shadow: 0 10px 20px rgba(0, 102, 204, 0.2);
        }
        
        @keyframes float404 {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-20px);
            }
        }
        
        /* 404数字背后的发光效果 */
        .error-code:after {
            content: '404';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 12rem;
            font-weight: 800;
            color: rgba(0, 102, 204, 0.1);
            z-index: -1;
            animation: pulseGlow 2s ease-in-out infinite alternate;
        }
        
        @keyframes pulseGlow {
            0% {
                opacity: 0.5;
                transform: translate(-50%, -50%) scale(1);
            }
            100% {
                opacity: 0.8;
                transform: translate(-50%, -50%) scale(1.1);
            }
        }
        
        /* 错误标题 */
        .error-title {
            font-size: 2.5rem;
            color: var(--dark);
            margin-bottom: 20px;
            position: relative;
            display: inline-block;
        }
        
        .error-title:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--accent);
        }
        
        /* 错误描述 */
        .error-description {
            font-size: 1.2rem;
            color: var(--gray);
            margin-bottom: 40px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        
        /* 多语言错误信息 */
        .multilingual-error {
            background-color: white;
            border-radius: var(--border-radius);
            padding: 30px;
            margin-bottom: 40px;
            box-shadow: var(--shadow);
            border: 1px solid var(--light-gray);
            position: relative;
            overflow: hidden;
        }
        
        .multilingual-error:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 5px;
            height: 100%;
            background: linear-gradient(180deg, var(--primary), var(--secondary));
        }
        
        .language-message {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        
        .message-item {
            padding: 10px 15px;
            border-radius: var(--border-radius);
            background-color: rgba(0, 102, 204, 0.05);
            transition: var(--transition);
            text-align: left;
            position: relative;
            overflow: hidden;
        }
        
        .message-item:hover {
            background-color: rgba(0, 102, 204, 0.1);
            transform: translateX(5px);
        }
        
        .message-item .language {
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 5px;
            display: flex;
            align-items: center;
            font-size: 0.9rem;
        }
        
        .message-item .language i {
            margin-right: 8px;
            font-size: 0.9rem;
        }
        
        .message-item .text {
            font-size: 1rem;
            color: var(--dark);
        }
        
        /* 按钮容器 */
        .action-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 40px;
            flex-wrap: wrap;
        }
        
        /* 404页面几何图形背景动画 */
        .not-found-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            overflow: hidden;
        }
        
        .not-found-bg-item {
            position: absolute;
            border-radius: 50%;
            opacity: 0.1;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            animation: floatGeometric 20s infinite linear;
        }
        
        .not-found-bg-item:nth-child(1) {
            width: 120px;
            height: 120px;
            top: 10%;
            left: 10%;
            animation-duration: 25s;
        }
        
        .not-found-bg-item:nth-child(2) {
            width: 180px;
            height: 180px;
            bottom: 15%;
            right: 10%;
            animation-duration: 30s;
            animation-direction: reverse;
        }
        
        .not-found-bg-item:nth-child(3) {
            width: 90px;
            height: 90px;
            top: 60%;
            left: 20%;
            animation-duration: 22s;
        }
        
        .not-found-bg-item:nth-child(4) {
            width: 150px;
            height: 150px;
            top: 20%;
            right: 20%;
            animation-duration: 28s;
            animation-direction: reverse;
        }
        
        .not-found-bg-item:nth-child(5) {
            width: 70px;
            height: 70px;
            top: 80%;
            left: 80%;
            animation-duration: 18s;
        }
        
        @keyframes floatGeometric {
            0% {
                transform: translate(0, 0) rotate(0deg);
            }
            25% {
                transform: translate(40px, 40px) rotate(90deg);
            }
            50% {
                transform: translate(0, 80px) rotate(180deg);
            }
            75% {
                transform: translate(-40px, 40px) rotate(270deg);
            }
            100% {
                transform: translate(0, 0) rotate(360deg);
            }
        }
        
        /* 404搜索框 */
        .search-box {
            max-width: 500px;
            margin: 30px auto;
            position: relative;
        }
        
        .search-box input {
            width: 100%;
            padding: 15px 20px;
            border: 2px solid var(--light-gray);
            border-radius: 50px;
            font-size: 1rem;
            transition: var(--transition);
            padding-right: 60px;
        }
        
        .search-box input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
        }
        
        .search-box button {
            position: absolute;
            right: 5px;
            top: 5px;
            background-color: var(--primary);
            color: white;
            border: none;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .search-box button:hover {
            background-color: var(--secondary);
            transform: scale(1.05);
        }
        
        /* ========== 响应式设计 ========== */
        @media (max-width: 992px) {
            .error-code {
                font-size: 8rem;
            }
            
            .error-code:after {
                font-size: 10rem;
            }
            
            .error-title {
                font-size: 2rem;
            }
        }
        
        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            
            .nav-menu {
                position: fixed;
                top: 90px;
                left: 0;
                width: 100%;
                background-color: white;
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
                transform: translateY(-100%);
                opacity: 0;
                transition: var(--transition);
                z-index: 999;
            }
            
            .nav-menu.active {
                transform: translateY(0);
                opacity: 1;
            }
            
            .nav-menu li {
                margin: 0 0 15px 0;
            }
            
            /* 移动端调整电话链接 */
            .nav-menu li:last-child {
                margin-top: 10px;
            }
            
            .error-code {
                font-size: 6rem;
            }
            
            .error-code:after {
                font-size: 8rem;
            }
            
            .error-title {
                font-size: 1.8rem;
            }
            
            .error-description {
                font-size: 1rem;
            }
            
            .action-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .btn {
                width: 100%;
                max-width: 300px;
            }
        }
        
        @media (max-width: 576px) {
            .not-found-section {
                padding: 60px 0;
            }
            
            .error-code {
                font-size: 5rem;
            }
            
            .error-code:after {
                font-size: 6rem;
            }
            
            .error-title {
                font-size: 1.5rem;
            }
            
            .multilingual-error {
                padding: 20px 15px;
            }
            
            /* 移动端调整电话链接 */
            .phone-link {
                min-width: 160px;
                padding: 10px 20px;
                font-size: 0.95rem;
            }
        }