/* --- H-LIFT MODERN INDUSTRIAL THEME --- */
    :root {
        --brand-primary: #1A365D; /* Deep Slate Blue */
        --brand-accent: #FF6B00;  /* Vibrant Safety Orange */
        --text-main: #2D3748;
        --text-muted: #718096;
        --bg-page: #F7FAFC;
        --bg-card: #FFFFFF;
        --border-color: #E2E8F0;
        --info-blue: #3182CE;
        --info-bg: #EBF8FF;
        --radius-md: 10px;
        --radius-lg: 16px;
        --shadow-sm: 0 2px 4px rgba(0,0,0,0.02);
        --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    }

    /* Global Typography */
    * { box-sizing: border-box; }
    body {
        font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
        font-size: 16px;
        color: var(--text-main);
        line-height: 1.6;
        margin: 0;
        padding: 20px;
        background-color: var(--bg-page);
    }

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

    /* --- 1. HERO SECTION --- */
    .hero-section {
        background: var(--bg-card);
        padding: 40px;
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-sm);
        margin-bottom: 30px;
        border-top: 5px solid var(--brand-primary);
        text-align: center;
    }

    .hero-title {
        font-size: 32px;
        color: var(--brand-primary);
        margin: 0 0 10px 0;
        font-weight: 800;
        letter-spacing: -0.5px;
    }
    
    .hero-subtitle {
        font-size: 18px;
        color: var(--text-muted);
        font-weight: 600;
        margin-bottom: 20px;
    }

    .hero-desc {
        color: var(--text-main);
        max-width: 850px;
        margin: 0 auto;
        text-align: left;
    }

    /* --- 2. UNIT CARDS GRID --- */
    .section-heading {
        font-size: 24px;
        color: var(--brand-primary);
        margin-top: 40px;
        margin-bottom: 20px;
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .section-heading::before {
        content: "";
        width: 6px;
        height: 24px;
        background: var(--brand-accent);
        border-radius: 4px;
    }

    .unit-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 20px;
        margin-bottom: 30px;
    }

    .unit-card {
        background: var(--bg-card);
        padding: 25px 20px;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-sm);
        border: 1px solid var(--border-color);
        transition: transform 0.2s;
    }
    
    .unit-card:hover {
        transform: translateY(-3px);
        box-shadow: var(--shadow-md);
        border-color: var(--brand-primary);
    }

    .unit-symbol {
        font-size: 28px;
        font-weight: 800;
        color: var(--brand-primary);
        margin-bottom: 5px;
        display: block;
    }

    .unit-name {
        font-size: 14px;
        text-transform: uppercase;
        color: var(--text-muted);
        font-weight: 700;
        margin-bottom: 10px;
        display: block;
        letter-spacing: 1px;
    }

    .unit-desc {
        margin: 0;
        font-size: 15px;
        color: var(--text-main);
    }

    /* --- 3. HIGHLIGHT INFO BOX --- */
    .info-box {
        background-color: var(--info-bg);
        border: 1px solid #BEE3F8;
        border-left: 5px solid var(--info-blue);
        padding: 20px 25px;
        border-radius: var(--radius-md);
        margin-bottom: 40px;
        color: var(--text-main);
    }

    .info-title {
        color: var(--info-blue);
        font-weight: 700;
        font-size: 18px;
        margin-bottom: 8px;
        display: block;
    }

    /* --- 4. DATA TABLE --- */
    .table-wrapper {
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        padding: 25px;
        box-shadow: var(--shadow-md);
        margin-bottom: 40px;
        overflow-x: auto;
    }

    .tech-table {
        width: 100%;
        border-collapse: collapse;
        min-width: 600px;
    }

    .tech-table th {
        background-color: var(--brand-primary);
        color: #ffffff;
        font-weight: 600;
        padding: 14px 15px;
        text-align: left;
        border-bottom: 3px solid var(--brand-accent);
    }

    .tech-table td {
        padding: 12px 15px;
        border-bottom: 1px solid var(--border-color);
        color: var(--text-main);
        vertical-align: middle;
    }

    .tech-table tbody tr:hover { background-color: #F0F4F8; }
    
    .highlight-text { font-weight: bold; color: var(--brand-primary); }

    /* --- 5. TERMINOLOGY SPLIT & FORMULA --- */
    .term-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
        margin-bottom: 25px;
    }

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

    .term-card {
        background: var(--bg-card);
        padding: 25px;
        border-radius: var(--radius-md);
        border-top: 4px solid var(--brand-primary);
        box-shadow: var(--shadow-sm);
    }

    .term-title {
        font-size: 20px;
        color: var(--brand-primary);
        margin-top: 0;
        margin-bottom: 15px;
    }

    .formula-banner {
        background-color: var(--brand-primary);
        color: #fff;
        padding: 25px;
        border-radius: var(--radius-md);
        text-align: center;
        margin-bottom: 40px;
        box-shadow: var(--shadow-md);
    }

    .formula-text {
        font-size: 28px;
        font-weight: 800;
        letter-spacing: 2px;
        color: var(--brand-accent);
        background: rgba(255,255,255,0.1);
        padding: 10px 20px;
        border-radius: 8px;
        display: inline-block;
        margin-top: 10px;
    }

    .reference-links {
        text-align: center;
        font-size: 14px;
        color: var(--text-muted);
        border-top: 1px solid var(--border-color);
        padding-top: 20px;
        margin-top: 40px;
    }
    
    .reference-links a { color: var(--info-blue); text-decoration: none; }
    .reference-links a:hover { text-decoration: underline; }