/* --- INDUSTRIAL THEME CSS --- */
    :root {
        --primary-color: #0b2c4d; /* Navy Blue */
        --secondary-color: #1a4a7a; /* Lighter Navy */
        --accent-color: #d35400;  /* Industrial Orange */
        --bg-light: #f4f7f6;
        --border-color: #e1e1e1;
        --text-main: #333;
        --text-muted: #666;
    }

    .alloy-page-wrapper {
        font-family: 'Helvetica Neue', Arial, sans-serif;
        max-width: 1200px;
        margin: 0 auto;
        color: var(--text-main);
        line-height: 1.6;
        padding-bottom: 60px;
    }

    /* --- TYPOGRAPHY & HEADERS --- */
    .section-header {
        text-align: center;
        margin-bottom: 40px;
        margin-top: 60px;
    }
    
    .section-header h2 {
        font-size: 2.2rem;
        color: var(--primary-color);
        margin-bottom: 10px;
        font-weight: 700;
        position: relative;
        display: inline-block;
    }
    
    .section-header h2::after {
        content: '';
        display: block;
        width: 60px;
        height: 3px;
        background: var(--accent-color);
        margin: 10px auto 0;
    }

    .section-desc {
        max-width: 800px;
        margin: 0 auto;
        color: var(--text-muted);
        text-align: center;
        font-size: 1.1rem;
    }

    /* --- INTRO BOX --- */
    .intro-box {
        background: #fff;
        border-left: 5px solid var(--accent-color);
        padding: 30px;
        box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        margin-bottom: 50px;
    }
    .intro-box h3 { color: var(--primary-color); margin-top: 0; }

    /* --- MAJOR GRID (For categories with sub-menus) --- */
    .major-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
        gap: 30px;
        margin-bottom: 60px;
    }

    .alloy-card {
        background: #fff;
        border: 1px solid var(--border-color);
        border-radius: 4px;
        overflow: hidden;
        display: flex;
        flex-direction: column;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .alloy-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 12px 24px rgba(0,0,0,0.1);
        border-color: var(--secondary-color);
    }

    .card-img {
        height: 200px;
        background-color: #eee;
        position: relative;
    }
    .card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .card-body {
        padding: 25px;
        flex-grow: 1;
        display: flex;
        flex-direction: column;
    }

    .card-body h3 {
        margin-top: 0;
        color: var(--primary-color);
        font-size: 1.5rem;
        margin-bottom: 10px;
    }
    
    .card-desc {
        font-size: 0.9rem; 
        color: #666; 
        margin-bottom: 15px;
        min-height: 40px;
    }

    /* Sub-menu badges */
    .grade-list {
        display: flex;
        flex-wrap: wrap;
        gap: 6px;
        margin-bottom: 20px;
    }
    
    .grade-link {
        font-size: 0.8rem;
        color: var(--secondary-color);
        background: #f0f4f8;
        padding: 4px 10px;
        border-radius: 3px;
        text-decoration: none;
        transition: all 0.2s;
        border: 1px solid #dae1e7;
        font-weight: 600;
    }

    .grade-link:hover {
        background: var(--secondary-color);
        color: #fff;
        border-color: var(--secondary-color);
    }

    .cta-btn {
        margin-top: auto;
        display: block;
        text-align: center;
        background: var(--primary-color);
        color: white;
        text-decoration: none;
        padding: 12px;
        border-radius: 4px;
        font-weight: bold;
        text-transform: uppercase;
        font-size: 0.85rem;
        transition: background 0.3s;
    }
    .cta-btn:hover { background: var(--accent-color); }

    /* --- SPECIALTY GRID (For single level items) --- */
    .specialty-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 20px;
    }

    .specialty-card {
        background: #fff;
        border: 1px solid var(--border-color);
        border-radius: 4px;
        padding: 20px;
        text-align: center;
        transition: all 0.3s;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        height: 100%;
        box-shadow: 0 2px 5px rgba(0,0,0,0.02);
    }

    .specialty-card:hover {
        border-color: var(--accent-color);
        transform: translateY(-3px);
        box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    }

    .specialty-card h4 {
        margin: 10px 0 0 0;
        color: var(--primary-color);
        font-size: 1.1rem;
    }

    .specialty-icon {
        font-size: 2rem;
        color: var(--secondary-color);
        margin-bottom: 5px;
    }

    .specialty-link {
        text-decoration: none;
        color: inherit;
        display: block;
        height: 100%;
    }

    /* --- TABLE & FAQ (Shared) --- */
    .tech-table-wrapper {
        overflow-x: auto;
        margin-bottom: 50px;
        box-shadow: 0 0 10px rgba(0,0,0,0.05);
    }
    .tech-table {
        width: 100%;
        border-collapse: collapse;
        min-width: 700px;
        background: #fff;
    }
    .tech-table th {
        background: var(--primary-color);
        color: #fff;
        padding: 15px;
        text-align: left;
    }
    .tech-table td {
        padding: 12px 15px;
        border-bottom: 1px solid #eee;
        color: #444;
    }
    .tech-table tr:nth-child(even) { background-color: #f8f9fa; }

    /* FAQ */
    .faq-item {
        margin-bottom: 15px;
        border: 1px solid var(--border-color);
        border-radius: 5px;
        background: #fff;
    }
    .faq-item summary {
        padding: 15px 20px;
        cursor: pointer;
        font-weight: 600;
        color: var(--primary-color);
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .faq-content {
        padding: 0 20px 20px 20px;
        color: #555;
        border-top: 1px solid #f0f0f0;
        margin-top: 10px;
    }

    /* Responsive */
    @media (max-width: 768px) {
        .section-header h2 { font-size: 1.8rem; }
        .major-grid { grid-template-columns: 1fr; }
        .specialty-grid { grid-template-columns: 1fr 1fr; }
    }
    h1 {
    text-align: center;
    margin-top: 30px;
}