.expertise-board {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.expertise-board details {
    background: rgba(10, 10, 10, 1);
    border: 2px solid var(--border);
    border-radius: 5px;
    transition: 0.3s;
}

    .expertise-board details:hover {
        background: rgba(20, 20, 20, 1);
        box-shadow: 0 0 30px var(--accent-glow);
        border-color: var(--accent);
    }

    .expertise-board details[open] {
        border-color: var(--accent);
        background: rgba(10, 10, 10, 1);
    }

    .expertise-board summary {
        padding: 10px 30px;
        list-style: none;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 1px;
        color: var(--accent);
        transition: 0.3s;
    }

        .expertise-board summary:hover {
            background: rgba(255, 255, 255, 0.05);
            box-shadow: 0 0 30px var(--accent-glow);
        }

        .expertise-board summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.8rem;
            transition: 0.3s;
        }

    .expertise-board details[open] summary::after {
        transform: rotate(180deg);
    }

.foldout-content {
    padding: 0 30px 30px 30px;
    display: grid;
    gap: 20px;
    border-top: 1px solid var(--border);
    padding-top: 20px;
}

.skill-category-desc {
    grid-column: 1 / -1;
    font-family: monospace;
    color: var(--muted);
    font-size: 0.9rem;
    margin-bottom: 10px;
    border-left: 2px solid var(--accent);
    padding-left: 15px;
}

.skill-list {
    list-style: none;
    flex-grow: 1;
}

    .skill-list li {
        font-size: 0.85rem;
        color: var(--text);
        margin-bottom: 8px;
        display: flex;
        align-items: center;
        gap: 10px;
    }

        .skill-list li::before {
            content: '>';
            color: var(--accent);
            font-family: monospace;
            font-weight: bold;
        }

.nested-title {
    color: var(--text);
    font-size: 0.75rem;
    text-transform: uppercase;
    margin-top: 15px;
    margin-bottom: 8px;
    opacity: 0.6;
    letter-spacing: 2px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 30px;
    gap: 20px;
    flex-wrap: wrap;
}

    .section-header h2 {
        margin-bottom: 0;
    }

.btn-small {
    padding: 8px 20px;
    font-size: 0.65rem;
    margin-bottom: 15px;
}