* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #ffffff;
            color: #0a2c3a;
            line-height: 1.5;
        }
        :root {
            --blue-dark: #062c42;
            --blue-primary: #0f5b8c;
            --blue-bright: #2c7cb6;
            --blue-soft: #e1f0fa;
            --gray-soft: #f1f5f9;
            --text-muted: #2e5a74;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 28px;
        }
        /* 头部导航（简化版，保持风格） */
        .site-header {
            position: sticky;
            top: 0;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.03);
        }
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            padding: 0.8rem 0;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--blue-dark), var(--blue-primary));
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            text-decoration: none;
        }
        .logo span {
            color: var(--blue-bright);
        }
        /* 404 主体 */
        .error-section {
            min-height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 4rem 0;
        }
        .error-code {
            font-size: 8rem;
            font-weight: 800;
            color: var(--blue-primary);
            line-height: 1;
            text-shadow: 2px 2px 10px rgba(0,0,0,0.05);
        }
        .error-title {
            font-size: 2rem;
            margin: 1rem 0;
            color: var(--blue-dark);
        }
        .error-message {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 500px;
            margin: 0 auto 2rem;
        }
        .search-box {
            max-width: 400px;
            margin: 0 auto 2rem;
            display: flex;
            gap: 0.5rem;
        }
        .search-box input {
            flex: 1;
            padding: 0.9rem 1rem;
            border-radius: 50px;
            border: 1px solid #cddfe8;
            background: white;
            font-size: 1rem;
        }
        .search-box button {
            background: var(--blue-bright);
            border: none;
            border-radius: 50px;
            padding: 0 1.5rem;
            color: white;
            cursor: pointer;
            transition: 0.2s;
        }
        .search-box button:hover {
            background: var(--blue-dark);
        }
        .btn-home {
            display: inline-block;
            background: var(--blue-bright);
            color: white;
            padding: 0.9rem 2rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: 0.2s;
            margin: 0.5rem;
        }
        .btn-home:hover {
            background: var(--blue-dark);
            transform: translateY(-2px);
        }
        /* 页脚 */
        footer {
            background: #05222e;
            color: #c0d4e2;
            padding: 2rem 0;
            margin-top: 3rem;
            text-align: center;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .error-code {
                font-size: 6rem;
            }
            .search-box {
                flex-direction: column;
            }
            .search-box button {
                padding: 0.8rem;
            }
        }