/* --- H-Lift Industrial Theme Variables --- */
    :root {
        --primary-color: #003366; /* Deep Navy Blue */
        --accent-color: #f39c12;  /* Safety Orange */
        --bg-light: #f4f7f6;
        --border-color: #e0e0e0;
        --text-dark: #333333;
        --text-light: #555555;
        --danger-color: #c0392b;
        --danger-bg: #fadbd8;
    }

    body {
        font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        color: var(--text-dark);
        line-height: 1.6;
        margin: 0;
        padding: 20px;
        background-color: #ffffff;
        font-size: 16px;
    }

    .container {
        max-width: 1000px;
        margin: 0 auto;
    }

    /* --- Header --- */
    .page-header {
        border-bottom: 4px solid var(--primary-color);
        padding-bottom: 20px;
        margin-bottom: 40px;
        text-align: center;
    }

    .page-header h1 {
        color: var(--primary-color);
        font-family: 'Cambria', serif;
        font-size: 32px;
        margin: 0 0 10px 0;
    }

    .sub-header {
        color: var(--text-light);
        font-weight: 600;
        font-size: 18px;
    }

    /* --- Critical Concepts Box --- */
    .concept-box {
        background-color: var(--bg-light);
        border-left: 5px solid var(--primary-color);
        padding: 20px;
        margin-bottom: 40px;
        border-radius: 4px;
    }

    .concept-title {
        font-weight: bold;
        color: var(--primary-color);
        font-size: 20px;
        margin-bottom: 15px;
        display: block;
        font-family: 'Cambria', serif;
    }

    /* --- Steps Styling --- */
    .step-section {
        margin-bottom: 40px;
        border: 1px solid var(--border-color);
        border-radius: 8px;
        overflow: hidden;
    }

    .step-header {
        background-color: var(--primary-color);
        color: #fff;
        padding: 15px 20px;
        font-size: 20px;
        font-family: 'Cambria', serif;
        font-weight: bold;
    }

    .step-content {
        padding: 25px;
    }

    /* --- Inspection Lists --- */
    .inspection-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }

    @media (max-width: 768px) {
        .inspection-grid {
            grid-template-columns: 1fr;
        }
    }

    .inspection-column h4 {
        color: var(--primary-color);
        border-bottom: 2px solid var(--accent-color);
        padding-bottom: 5px;
        margin-top: 0;
    }

    .check-list {
        list-style: none;
        padding: 0;
    }

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

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

    /* --- Warning Boxes --- */
    .danger-box {
        background-color: var(--danger-bg);
        border: 2px solid var(--danger-color);
        color: var(--danger-color);
        padding: 15px;
        text-align: center;
        font-weight: bold;
        border-radius: 4px;
        margin-top: 20px;
    }

    .warning-note {
        background-color: #fff3e0;
        border-left: 4px solid var(--accent-color);
        padding: 15px;
        margin: 15px 0;
        font-size: 15px;
    }

    /* --- Image Placeholder --- */
    .diagram-placeholder {
        text-align: center;
        margin: 20px 0;
        padding: 10px;
        background-color: #f9f9f9;
        border: 1px dashed #ccc;
        border-radius: 6px;
    }

    .diagram-caption {
        font-size: 13px;
        color: #666;
        font-style: italic;
        margin-top: 5px;
        display: block;
    }