/* 字体导入 - 使用粗犷的无衬线体 */
        @import url('https://fonts.googleapis.com/css2?family=Black+Ops+One&family=Orbitron:wght@400;700&family=Roboto+Condensed:wght@700&display=swap');
        
        :root {
            --metal-gray: #333333;
            --metal-gray-light: #4d4d4d;
            --metal-gray-dark: #1a1a1a;
            --safety-orange: #FF7900;
            --safety-orange-light: #FF9E4F;
            --safety-orange-dark: #CC6100;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Roboto Condensed', sans-serif;
            background-color: var(--metal-gray);
            color: white;
            line-height: 1.6;
        }
        
        /* 螺栓装饰边框 */
        .bolt-border {
            position: relative;
            border: 3px solid var(--safety-orange);
            padding: 20px;
            margin: 15px 0;
        }
        
        .bolt-border::before, .bolt-border::after {
            content: "";
            position: absolute;
            width: 20px;
            height: 20px;
            background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20"><circle cx="10" cy="10" r="8" fill="%23FF7900"/><polygon points="10,2 12,8 18,10 12,12 10,18 8,12 2,10 8,8" fill="%23333333"/></svg>');
            background-size: contain;
        }
        
        .bolt-border::before {
            top: -10px;
            left: -10px;
        }
        
        .bolt-border::after {
            bottom: -10px;
            right: -10px;
        }
        
        /* 导航栏 */
        header {
            background-color: var(--metal-gray-dark);
            padding: 1rem;
            border-bottom: 3px solid var(--safety-orange);
        }
        
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-family: 'Black Ops One', cursive;
            font-size: 2rem;
            color: var(--safety-orange);
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 2rem;
        }
        
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: bold;
            text-transform: uppercase;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--safety-orange);
        }
        
        /* 英雄区域 */
        .hero {
            height: 70vh;
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), 
                        url('https://images.unsplash.com/photo-1597852074816-d933c7d2b988') no-repeat center center/cover;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: 0 2rem;
        }
        
        .hero h1 {
            font-family: 'Orbitron', sans-serif;
            font-size: 3.5rem;
            margin-bottom: 1rem;
            color: var(--safety-orange);
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }
        
        .hero p {
            font-size: 1.5rem;
            max-width: 800px;
            margin-bottom: 2rem;
        }
        
        .btn {
            display: inline-block;
            background-color: var(--safety-orange);
            color: white;
            padding: 0.8rem 1.5rem;
            text-decoration: none;
            border-radius: 5px;
            font-weight: bold;
            text-transform: uppercase;
            transition: background-color 0.3s;
        }
        
        .btn:hover {
            background-color: var(--safety-orange-dark);
        }
        
        /* 主要内容区域 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem;
        }
        
        section {
            margin: 3rem 0;
        }
        
        h2 {
            font-family: 'Orbitron', sans-serif;
            color: var(--safety-orange);
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            text-align: center;
        }
        
        /* 3D模型查看器 */
        .model-viewer {
            background-color: var(--metal-gray-light);
            height: 500px;
            display: flex;
            justify-content: center;
            align-items: center;
            margin: 2rem 0;
        }
        
        /* VR全景导览 */
        .vr-tour {
            background-color: var(--metal-gray-light);
            height: 500px;
            display: flex;
            justify-content: center;
            align-items: center;
            margin: 2rem 0;
        }
        
        /* 数据仪表盘 */
        .dashboard {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            margin: 2rem 0;
        }
        
        .dashboard-item {
            background-color: var(--metal-gray-light);
            padding: 1.5rem;
            text-align: center;
            border-left: 5px solid var(--safety-orange);
        }
        
        .dashboard-value {
            font-size: 2.5rem;
            font-weight: bold;
            color: var(--safety-orange);
            margin: 0.5rem 0;
        }
        
        /* 锯齿形工艺流程图 */
        .process-flow {
            margin: 3rem 0;
            position: relative;
        }
        
        .process-step {
            display: flex;
            margin-bottom: 2rem;
            align-items: center;
        }
        
        .process-step:nth-child(even) {
            flex-direction: row-reverse;
        }
        
        .process-content {
            flex: 1;
            padding: 1.5rem;
        }
        
        .process-image {
            flex: 1;
            height: 300px;
            background-color: var(--metal-gray-light);
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .process-number {
            width: 60px;
            height: 60px;
            background-color: var(--safety-orange);
            color: var(--metal-gray-dark);
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 2rem;
            font-weight: bold;
            margin: 0 1rem;
        }
        
        /* 新闻列表 */
        .news-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin-top: 2rem;
        }
        
        .news-item {
            background-color: var(--metal-gray-light);
            border-left: 5px solid var(--safety-orange);
            padding: 1.5rem;
            transition: transform 0.3s;
        }
        
        .news-item:hover {
            transform: translateY(-5px);
        }
        
        .news-date {
            color: var(--safety-orange);
            font-weight: bold;
            margin-bottom: 0.5rem;
        }
        
        .news-title {
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
        }
        
        /* 页脚 */
        footer {
            background-color: var(--metal-gray-dark);
            padding: 2rem;
            text-align: center;
            border-top: 3px solid var(--safety-orange);
        }
        
        .footer-links {
            display: flex;
            justify-content: center;
            list-style: none;
            margin: 1rem 0;
        }
        
        .footer-links li {
            margin: 0 1rem;
        }
        
        .footer-links a {
            color: white;
            text-decoration: none;
        }
        
        .footer-links a:hover {
            color: var(--safety-orange);
        }
        
        .copyright {
            margin-top: 1rem;
            color: #999;
        }