:root {
            --primary:#1e6fff;
            --blue-dark:#0d47a1;
            --bg:#f8f9fb;
            --text:#333;
            --gray:#666;
        }

        * { margin:0; padding:0; box-sizing:border-box; }
        html,body { overflow-x:hidden; }
        body {
            font-family:"Microsoft YaHei","PingFang SC";
            color:var(--text);
        }

        .container {
            max-width:1200px;
            margin:0 auto;
            padding:0 20px;
        }

        /* Header（与最终版一致） */
        header {
            position:fixed; top:0; width:100%;
            background:rgba(255,255,255,.98);
            box-shadow:0 2px 10px rgba(0,0,0,.1);
            z-index:1000;
        }
        nav {
            display:flex; justify-content:space-between; align-items:center;
            height:76px;
        }
        .logo h1 { color:var(--primary); font-size:26px; }
        .logo span { font-size:12px; color:var(--gray); margin-left:15px; }

        .nav-menu { display:flex; list-style:none; }
        .nav-menu li { margin-left:35px; }
        .nav-menu a {
            text-decoration:none; color:var(--text);
            font-size:15px; transition:.3s;
        }
        .nav-menu a:hover,
        .nav-menu a.active { color:var(--primary); }

        .menu-toggle { display:none; font-size:24px; cursor:pointer; }

        /* Breadcrumb */
        .breadcrumb {
            margin-top:76px;
            padding:20px 0;
            background:var(--bg);
            font-size:14px;
        }
        .breadcrumb a {
            color:var(--primary);
            text-decoration:none;
        }
        .breadcrumb span { color:var(--gray); }

        /* Case Detail */
        .case-detail {
            padding:60px 0 90px;
        }
        .case-header {
            text-align:center;
            margin-bottom:50px;
        }
        .case-header h1 {
            font-size:42px;
            margin-bottom:20px;
        }
        .case-meta {
            display:flex;
            justify-content:center;
            gap:30px;
            color:var(--gray);
            font-size:14px;
        }
        .case-meta span {
            display:flex;
            align-items:center;
            gap:8px;
        }

        /* Case Image */
        .case-hero-image {
            height:450px;
            background:linear-gradient(135deg,#e0e0e0,#f5f5f5);
            border-radius:12px;
            display:flex; align-items:center; justify-content:center;
            color:#999; font-size:24px;
            margin-bottom:60px;
        }

        /* Case Content */
        .case-content {
            display:grid;
            grid-template-columns:2fr 1fr;
            gap:60px;
        }
        .case-main h2 {
            font-size:28px;
            margin-bottom:20px;
            color:var(--text);
        }
        .case-main p {
            color:var(--gray);
            line-height:1.9;
            margin-bottom:25px;
            font-size:16px;
        }
        .case-main ul {
            padding-left:20px;
            color:var(--gray);
            line-height:2;
            margin-bottom:30px;
        }
        .case-main li { margin-bottom:10px; }

        /* Tech Stack */
        .tech-stack {
            background:var(--bg);
            padding:30px;
            border-radius:12px;
            margin-bottom:30px;
        }
        .tech-tags {
            display:flex;
            flex-wrap:wrap;
            gap:12px;
            margin-top:15px;
        }
        .tech-tag {
            background:var(--primary);
            color:#fff;
            padding:8px 18px;
            border-radius:20px;
            font-size:13px;
        }

        /* Sidebar */
        .sidebar {
            position:sticky;
            top:100px;
        }
        .sidebar-card {
            background:#fff;
            padding:30px;
            border-radius:12px;
            box-shadow:0 5px 25px rgba(0,0,0,.08);
            margin-bottom:30px;
        }
        .sidebar-card h3 {
            font-size:18px;
            margin-bottom:20px;
            padding-bottom:15px;
            border-bottom:1px solid #eee;
        }
        .sidebar-list {
            list-style:none;
        }
        .sidebar-list li {
            padding:12px 0;
            border-bottom:1px solid #f0f0f0;
        }
        .sidebar-list li:last-child { border-bottom:none; }
        .sidebar-list a {
            color:var(--gray);
            text-decoration:none;
            transition:.3s;
        }
        .sidebar-list a:hover { color:var(--primary); }

        .sidebar-cta {
            background:linear-gradient(135deg,var(--primary),#00bfff);
            color:#fff;
            text-align:center;
        }
        .sidebar-cta h3 { color:#fff; border-bottom-color:rgba(255,255,255,.3); }
        .sidebar-cta p {
            color:rgba(255,255,255,.9);
            margin-bottom:20px;
        }
        .cta-btn {
            display:inline-block;
            background:#fff;
            color:var(--primary);
            padding:12px 30px;
            border-radius:25px;
            text-decoration:none;
            font-weight:bold;
            transition:.3s;
        }
        .cta-btn:hover { transform:scale(1.05); }

        /* Related Cases */
        .related-cases {
            padding:60px 0;
            background:var(--bg);
        }
        .related-grid {
            display:grid;
            grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
            gap:30px;
        }
        .related-card {
            background:#fff;
            border-radius:12px;
            overflow:hidden;
            box-shadow:0 5px 20px rgba(0,0,0,.08);
            transition:.3s;
			color: #666;
			text-decoration: none;
        }
        .related-card:hover { transform:translateY(-5px); }
        .related-image {
            height:180px;
            background:#e0e0e0;
            display:flex; align-items:center; justify-content:center;
            color:#999;
        }
        .related-info {
            padding:20px;
        }
        .related-info h4 {
            font-size:16px;
            margin-bottom:10px;
        }

        /* Footer */
        footer { background: #1a1a2e; color: white; padding: 70px 0 20px; }
        .footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 50px; }
        .footer-column h4 { font-size: 18px; margin-bottom: 25px; position: relative; padding-bottom: 10px; }
        .footer-column h4::after { content: ''; display: block; width: 40px; height: 3px; background: var(--primary-blue); position: absolute; bottom: 0; left: 0; }
        .footer-column p { color: #aaa; line-height: 1.9; margin-bottom: 20px; }
		.footer-column h4 {
		    color: #fff;
		    margin-bottom: 25px;
		    font-size: 18px;
		}
		.footer-column img {
		    width: 20px;
		    height: 20px;
		    object-fit: contain;
		    filter: brightness(0) invert(1); /* ✅ 白色图标 */
		}
        .footer-column ul { list-style: none; }
        .footer-column ul li { margin-bottom: 12px; }
        .footer-column ul li a { color: #aaa; text-decoration: none; transition: color 0.3s; font-size: 14px; }
        .footer-column ul li a:hover { color: var(--primary-blue); }
        .social-links { display: flex; gap: 15px; margin-top: 20px; }
        .social-links a { width: 42px; height: 42px; background: #2a2a4a; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: white; text-decoration: none; transition: all 0.3s; font-size: 14px; }
        .social-links a:hover { background: var(--primary-blue); transform: translateY(-3px); }
        .footer-bottom { text-align: center; padding-top: 25px; border-top: 1px solid #2a2a4a; color: #777; font-size: 14px; line-height: 25px;}
		.footer-bottom p a{
			color: #777;
			text-decoration: none; 
		}
        /* Responsive */
        @media (max-width: 1024px) { .services-grid { grid-template-columns: repeat(2, 1fr); } .advantages-grid { grid-template-columns: repeat(2, 1fr); } .cases-grid { grid-template-columns: repeat(2, 1fr); } .footer-content { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 768px) { .menu-toggle { display: block; } .nav-menu { display: none; position: absolute; top: 100%; left: 0; right: 0; background: white; flex-direction: column; padding: 20px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); } .nav-menu.active { display: flex; } .nav-menu li { margin: 10px 0; } .nav-phone { display: none; } .banner-content h2 { font-size: 36px; } .about-content, .contact-content { grid-template-columns: 1fr; } .services-grid, .cases-grid, .news-grid { grid-template-columns: 1fr; } .advantages-grid { grid-template-columns: repeat(2, 1fr); } .footer-content { grid-template-columns: 1fr; } }
        @media (max-width: 480px) { .banner { height: 450px; } .banner-content h2 { font-size: 28px; } .section-title h2 { font-size: 28px; } .advantages-grid { grid-template-columns: 1fr; } }