/* CSS Reset & Variable Definitions */
        :root {
            --primary-color: #0066cc;
            --text-main: #1d1d1f;
            --text-secondary: #515154;
            --bg-light: #f5f5f7;
            --bg-white: #ffffff;
            --border-color: #e5e5e7;
            --max-width: 1200px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        }

        body {
            color: var(--text-main);
            background-color: var(--bg-white);
            line-height: 1.6;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Typography & Utility */
        h1, h2, h3 {
            font-weight: 600;
            letter-spacing: -0.02em;
        }

        .section-padding {
            padding: 80px 0;
        }

        .bg-gray {
            background-color: var(--bg-light);
        }

        .text-center {
            text-align: center;
        }

        /* 1. Hero Section */
        .hero-section {
            padding: 80px 0 40px;
            background: linear-gradient(180deg, #fafafa 0%, #ffffff 100%);
        }

        .subheadline {
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 12px;
        }

        .hero-title {
            font-size: 2.8rem;
            line-height: 1.2;
            margin-bottom: 20px;
            color: #111;
        }

        .hero-desc {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 800px;
            margin: 0 auto 30px;
        }

        .hero-image-container {
            max-width: 900px;
            margin: 30px auto 0;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            background: #fff;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }

        .hero-image-container img {
            width: 100%;
            height: auto;
            display: block;
        }

        /* 2. Key Features Section */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 40px;
        }

        .feature-card {
            background: var(--bg-white);
            border-radius: 12px;
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
        }

        .feature-img-box {
            width: 100%;
            height: 180px;
            overflow: hidden;
            background-color: #eee;
        }

        .feature-img-box img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .feature-content {
            padding: 20px;
        }

        .feature-title {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--text-main);
        }

        .feature-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        /* 3. Product Details Section */
        .detail-row {
            display: flex;
            align-items: center;
            gap: 50px;
            margin-top: 40px;
        }

        .detail-image {
            flex: 1;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 16px rgba(0,0,0,0.04);
        }

        .detail-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        .detail-text {
            flex: 1;
        }

        .detail-text h3 {
            font-size: 1.8rem;
            margin-bottom: 16px;
        }

        .detail-text p {
            font-size: 1.05rem;
            color: var(--text-secondary);
        }

        /* 4. Modular Layouts Section */
        .modular-box {
            background: var(--bg-white);
            border-radius: 16px;
            padding: 40px;
            border: 1px solid var(--border-color);
            max-width: 900px;
            margin: 30px auto 0;
        }

        /* 5. Applications Section */
        .app-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-top: 40px;
        }

        .app-card {
            background: var(--bg-white);
            border-radius: 12px;
            padding: 30px;
            border: 1px solid var(--border-color);
        }

        /* 6. Specifications Table */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            margin-top: 40px;
        }

        .spec-table {
            width: 100%;
            border-collapse: collapse;
            background: var(--bg-white);
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 1px 3px rgba(0,0,0,0.05);
        }

        .spec-table th, .spec-table td {
            padding: 16px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border-color);
            font-size: 0.95rem;
        }

        .spec-table th {
            background-color: #f2f2f4;
            color: var(--text-main);
            font-weight: 600;
            width: 30%;
        }

        .spec-table tr:last-child td, .spec-table tr:last-child th {
            border-bottom: none;
        }

        /* Mobile Adaptation / 移动端适配 CSS */
        @media (max-width: 992px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .app-grid {
                grid-template-columns: repeat(1, 1fr);
            }
            .detail-row {
                flex-direction: column;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            .section-padding {
                padding: 50px 0;
            }
            .hero-title {
                font-size: 2rem;
            }
            .hero-desc {
                font-size: 1rem;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .modular-box {
                padding: 24px;
            }
            .spec-table th, .spec-table td {
                padding: 12px 14px;
                font-size: 0.85rem;
            }
            .spec-table th {
                width: 40%;
            }
        }