/* --- Basic Styles --- */
    :root {
        /* Grade 120 often uses distinct colors like Blue or specialized coating colors. 
           Using a deep industrial blue/slate theme. */
        --primary-color: #2c3e50; 
        --accent-color: #e74c3c; /* Safety Red for highlights */
        --text-dark: #333;
        --text-light: #666;
        --bg-light: #f4f6f8;
        --border-color: #dce1e6;
    }

    body {
        font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        color: var(--text-dark);
        line-height: 1.6;
        margin: 0;
        padding: 20px;
        background-color: #fff;
    }

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

    /* --- Header Section --- */
    .product-header {
        border-bottom: 3px solid var(--primary-color);
        padding-bottom: 20px;
        margin-bottom: 30px;
    }

    .product-header h1 {
        color: var(--primary-color);
        font-size: 32px;
        margin: 0 0 10px 0;
    }

    .product-header .subtitle {
        font-size: 18px;
        color: var(--text-light);
        font-weight: 500;
    }

    /* --- Features Layout --- */
    .content-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: 40px;
        margin-bottom: 50px;
    }

    @media (min-width: 992px) {
        .content-grid {
            grid-template-columns: 3fr 2fr;
        }
    }

    .feature-box {
        background: var(--bg-light);
        padding: 25px;
        border-radius: 8px;
        border-left: 5px solid var(--accent-color);
    }

    h3 {
        color: var(--primary-color);
        font-size: 22px;
        margin-top: 0;
        margin-bottom: 20px;
        border-bottom: 1px solid #ddd;
        padding-bottom: 10px;
    }

    .feature-list {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .feature-list li {
        margin-bottom: 12px;
        padding-left: 25px;
        position: relative;
    }

    .feature-list li::before {
        content: "✓";
        color: var(--accent-color);
        font-weight: bold;
        position: absolute;
        left: 0;
    }

    .app-list li {
        margin-bottom: 8px;
        list-style-type: disc;
        margin-left: 20px;
    }

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

    .image-wrapper img {
        max-width: 100%;
        height: auto;
        border-radius: 8px;
        box-shadow: 0 4px 15px rgba(0,0,0,0.1);
        border: 1px solid var(--border-color);
    }

    /* --- Tech Table --- */
    .table-responsive {
        width: 100%;
        overflow-x: auto;
        box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        border-radius: 8px;
        border: 1px solid var(--border-color);
    }

    table {
        width: 100%;
        border-collapse: collapse;
        min-width: 900px;
        font-size: 14px;
        background: #fff;
    }

    th {
        background-color: var(--primary-color);
        color: #fff;
        padding: 12px;
        text-align: center;
        border: 1px solid #1a252f;
        vertical-align: middle;
    }

    td {
        padding: 10px;
        border: 1px solid #eee;
        text-align: center;
        color: #555;
    }

    tbody tr:nth-child(even) {
        background-color: #f9f9f9;
    }

    tbody tr:hover {
        background-color: #eef2f5;
    }