/* Top navigation cards */
    .charges-nav-top { display: flex; flex-direction: column; gap: 12px; margin: 20px 0 28px; }
    .charges-nav-card {
        display: flex; align-items: center; gap: 14px;
        padding: 16px 20px; border-radius: 10px;
        text-decoration: none; color: inherit;
        transition: box-shadow 0.2s, transform 0.15s;
    }
    .charges-nav-card:hover { transform: translateX(4px); box-shadow: var(--shadow-card-hover, 0 4px 12px rgba(0,0,0,0.08)); text-decoration: none; color: inherit; }
    .charges-nav-icon { font-size: var(--font-size-5xl, 28px); flex-shrink: 0; }
    .charges-nav-card strong { display: block; font-size: var(--font-size-sm, 14px); margin-bottom: 2px; }
    .charges-nav-card p { margin: 0; font-size: var(--font-size-xs, 12px); line-height: 1.4; color: var(--color-text-muted); }
    .charges-nav-arrow { font-size: var(--font-size-xl, 20px); margin-left: auto; flex-shrink: 0; color: var(--color-text-muted); }
    .charges-nav-utility { background: var(--color-info-bg, var(--color-info-bg, #eef5ff)); border: 1px solid var(--color-info, var(--color-input-focus, #3498db)); }
    .charges-nav-utility strong { color: var(--color-info, var(--color-input-focus, #3498db)); }
    .charges-nav-rental { background: var(--color-success-bg, var(--color-success-bg, #eaf7ee)); border: 1px solid var(--color-success, var(--color-success, #34A853)); }
    .charges-nav-rental strong { color: var(--color-success, var(--color-success, #34A853)); }
    .charges-nav-onetime { background: var(--color-warning-bg, var(--color-warning-bg, #fff3e8)); border: 1px solid var(--color-warning, var(--color-warning, #F97316)); }
    .charges-nav-onetime strong { color: var(--color-warning, var(--color-warning, #F97316)); }

    /* Consumption types grid */
    .consumption-types-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
        margin: 20px 0;
    }

    .consumption-card {
        background: var(--color-card-background);
        border: 1px solid var(--color-border);
        border-radius: 10px;
        padding: 20px;
        border-top: 4px solid var(--color-border);
        transition: all 0.3s ease;
    }

    .consumption-card:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-card-hover, 0 4px 12px rgba(0, 0, 0, 0.1));
    }

    .consumption-fixed {
        border-top-color: var(--color-info);
    }

    .consumption-counters {
        border-top-color: var(--color-success);
    }

    .consumption-incurred {
        border-top-color: var(--color-warning);
    }

    .consumption-header {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 12px;
    }

    .consumption-icon {
        font-size: var(--font-size-4xl, 26px);
    }

    .consumption-header h3 {
        margin: 0;
        color: var(--color-secondary);
        font-size: var(--font-size-base, 16px);
    }

    .consumption-card p {
        color: var(--color-text);
        line-height: 1.6;
        margin-bottom: 12px;
    }

    .consumption-example {
        background: var(--color-background);
        border-left: 3px solid var(--color-border);
        padding: var(--spacing-sm) 12px;
        border-radius: 4px;
        font-size: var(--font-size-xs, 12px);
        color: var(--color-text-secondary);
    }

    .consumption-example strong {
        color: var(--color-secondary);
    }

    /* Periods grid */
    .periods-grid {
        display: flex;
        flex-direction: column;
        gap: 10px;
        margin: 16px 0;
    }

    .period-item {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 14px;
        background: var(--color-background);
        border-radius: var(--border-radius-sm);
    }

    .period-desc {
        color: var(--color-text);
        font-size: var(--font-size-sm, 14px);
        line-height: 1.5;
    }

    /* Provider Types Section */
    .provider-types {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
        margin: 24px 0;
    }

    .provider-type {
        background: var(--color-card-background);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius-sm);
        padding: 20px;
        transition: all 0.3s ease;
    }

    .provider-type:hover {
        border-color: var(--color-primary);
        box-shadow: var(--shadow-primary);
        transform: translateY(-2px);
    }

    .provider-header {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 12px;
    }

    .provider-icon {
        font-size: var(--font-size-5xl, 28px);
    }

    .provider-header h3 {
        margin: 0;
        color: var(--color-secondary);
        font-size: var(--font-size-base, 16px);
    }

    .provider-type p {
        color: var(--color-text);
        line-height: 1.6;
        margin-bottom: 0;
    }

    /* Info box */
    .info-box {
        background: var(--color-background);
        border: 1px solid var(--color-border);
        border-left: 4px solid var(--color-primary);
        border-radius: var(--border-radius-sm);
        padding: 16px 20px;
        margin: 20px 0;
    }

    .info-box-primary {
        background: var(--color-primary-bg-gradient, linear-gradient(135deg, rgba(52, 152, 219, 0.05) 0%, rgba(52, 152, 219, 0.02) 100%));
        border-left-color: var(--color-primary);
    }

    .info-box h4 {
        margin: 0 0 12px;
        color: var(--color-secondary);
        font-size: var(--font-size-sm, 14px);
    }

    .info-box p {
        margin: var(--spacing-sm) 0;
        color: var(--color-text);
    }

    .info-box ul {
        margin: 0;
        padding-left: 20px;
    }

    .info-box li {
        margin: var(--spacing-sm) 0;
        color: var(--color-text);
        line-height: 1.6;
    }

    /* Library table */
    .library-table {
        width: 100%;
        border-collapse: collapse;
        background: var(--color-card-background);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius-sm);
        overflow: hidden;
        margin: 16px 0;
    }

    .library-table th,
    .library-table td {
        padding: 12px 16px;
        text-align: left;
        border-bottom: 1px solid var(--color-border);
    }

    .library-table th {
        background: var(--color-background);
        font-weight: var(--font-weight-semibold, 600);
        color: var(--color-secondary);
        font-size: var(--font-size-xs, 12px);
    }

    .library-table tbody tr:hover {
        background: var(--color-background);
    }

    .library-table tbody tr:last-child td {
        border-bottom: none;
    }

    /* Related links */
    .related-links {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
        margin-top: 16px;
    }

    .related-link {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        padding: 12px 16px;
        background: var(--color-background);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius-sm);
        text-decoration: none;
        color: var(--color-secondary);
        transition: all 0.2s;
    }

    .related-link:hover {
        background: var(--color-primary);
        border-color: var(--color-primary);
        color: var(--button-primary-text);
    }

    .related-icon {
        font-size: var(--font-size-lg, 18px);
    }

    /* Note blocks */
    .note {
        padding: var(--spacing-sm) var(--spacing-md);
        margin: 10px 0;
        border-radius: 4px;
        background: var(--color-info-bg);
        border-left: 3px solid var(--color-info);
        font-size: var(--font-size-sm, 14px);
        color: var(--color-info);
    }

    @media (max-width: 800px) {
        .consumption-types-grid {
            grid-template-columns: 1fr;
        }
        .provider-types {
            grid-template-columns: 1fr;
        }
    }