/* ===== 404页面独享样式 ===== */
        .error-section {
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--light-gray);
            position: relative;
            overflow: hidden;
        }
        
        .error-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 20% 80%, rgba(74, 108, 247, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(142, 108, 247, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(0, 201, 255, 0.05) 0%, transparent 50%);
            animation: float 20s infinite linear;
        }
        
        @keyframes float {
            0% {
                transform: translate(0, 0) rotate(0deg);
            }
            33% {
                transform: translate(30px, -50px) rotate(120deg);
            }
            66% {
                transform: translate(-20px, 20px) rotate(240deg);
            }
            100% {
                transform: translate(0, 0) rotate(360deg);
            }
        }
        
        .error-content {
            text-align: center;
            position: relative;
            z-index: 1;
            max-width: 800px;
            margin: 0 auto;
            padding: 0 20px;
            animation: fadeInUp 1s ease-out;
        }
        
        .error-code {
            font-size: 12rem;
            font-weight: 800;
            line-height: 1;
            margin-bottom: 20px;
            background: var(--gradient);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 10px 30px rgba(74, 108, 247, 0.3);
            position: relative;
            display: inline-block;
        }
        
        .error-code::before {
            content: '';
            position: absolute;
            top: -10px;
            left: -10px;
            right: -10px;
            bottom: -10px;
            background: var(--gradient);
            border-radius: 20px;
            z-index: -1;
            opacity: 0.1;
            filter: blur(20px);
        }
        
        .error-title {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--dark);
        }
        
        .error-description {
            font-size: 1.2rem;
            margin-bottom: 40px;
            color: var(--text);
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .error-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 40px;
        }
        
        .error-actions .btn:last-child {
            background: transparent;
            color: var(--primary);
            box-shadow: inset 0 0 0 2px var(--primary);
        }
        
        .error-actions .btn:last-child:hover {
            background: var(--primary);
            color: white;
        }
        
        .floating-shapes {
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
        }
        
        .shape {
            position: absolute;
            border-radius: 50%;
            background: var(--gradient-light);
            opacity: 0.7;
            filter: blur(40px);
            animation: floatShape 15s infinite ease-in-out;
        }
        
        .shape:nth-child(1) {
            width: 300px;
            height: 300px;
            top: 10%;
            left: 10%;
            animation-delay: 0s;
        }
        
        .shape:nth-child(2) {
            width: 200px;
            height: 200px;
            top: 50%;
            right: 10%;
            animation-delay: -5s;
        }
        
        .shape:nth-child(3) {
            width: 250px;
            height: 250px;
            bottom: 10%;
            left: 20%;
            animation-delay: -10s;
        }
        
        @keyframes floatShape {
            0%, 100% {
                transform: translate(0, 0) scale(1);
            }
            33% {
                transform: translate(30px, -50px) scale(1.1);
            }
            66% {
                transform: translate(-20px, 20px) scale(0.9);
            }
        }
        
        /* ===== 底部样式 ===== */
        footer {
            background: var(--dark);
            color: white;
            padding: 80px 0 20px;
            position: relative;
            overflow: hidden;
        }
        
        footer::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 20% 80%, rgba(74, 108, 247, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(142, 108, 247, 0.1) 0%, transparent 50%);
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 50px;
            position: relative;
            z-index: 1;
        }
        
        .footer-column h3 {
            font-size: 1.5rem;
            margin-bottom: 25px;
            position: relative;
            display: inline-block;
            color: white;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--gradient);
        }
        
        .footer-column p, .footer-column a {
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 12px;
            display: block;
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-column a:hover {
            color: white;
            transform: translateX(5px);
        }
        
        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 45px;
            height: 45px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            transition: var(--transition);
            color: white;
            font-size: 1.2rem;
        }
        
        .social-links a:hover {
            background: var(--gradient);
            transform: translateY(-5px);
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.5);
            position: relative;
            z-index: 1;
        }
        
        /* ===== 动画定义 ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(40px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes fadeInLeft {
            from {
                opacity: 0;
                transform: translateX(-40px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }
        
        @keyframes fadeInRight {
            from {
                opacity: 0;
                transform: translateX(40px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }
        
        /* ===== 响应式设计 ===== */
        @media (max-width: 992px) {
            .error-code {
                font-size: 10rem;
            }
            
            .error-title {
                font-size: 2.2rem;
            }
        }
        
        @media (max-width: 768px) {
            .navbar {
                padding: 15px 0;
            }
            
            .nav-links {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background: white;
                flex-direction: column;
                align-items: center;
                justify-content: flex-start;
                padding-top: 50px;
                transition: var(--transition);
                box-shadow: var(--shadow);
            }
            
            .nav-links.active {
                left: 0;
            }
            
            .nav-links li {
                margin: 20px 0;
            }
            
            .hamburger {
                display: block;
            }
            
            .error-code {
                font-size: 8rem;
            }
            
            .error-title {
                font-size: 2rem;
            }
            
            .error-description {
                font-size: 1.1rem;
            }
            
            .error-actions {
                flex-direction: column;
                align-items: center;
                gap: 15px;
            }
        }
        
        @media (max-width: 576px) {
            .error-code {
                font-size: 6rem;
            }
            
            .error-title {
                font-size: 1.7rem;
            }
            
            .error-description {
                font-size: 1rem;
            }
        }