/* Expertise Section */

.expertise-list {
    margin-top: 4rem;
}

.expertise-item {
    border-bottom: 1px solid #ddd;
    padding: 2rem 0;
    cursor: pointer;
    transition: all 0.3s ease;
}

.expertise-item:hover {
    padding-left: 2rem;
}

.expertise-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.expertise-number {
    font-size: 1rem;
    color: var(--gray-text);
    margin-right: 2rem;
}

.expertise-title {
    font-size: 2.5rem;
    font-weight: 600;
    flex: 1;
}

.expertise-tag {
    padding: 0.5rem 1.5rem;
    background: white;
    border-radius: 50px;
    font-size: 0.9rem;
    margin-right: 2rem;
}

.expertise-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.expertise-item.active .expertise-toggle {
    transform: rotate(45deg);
}

.expertise-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
}

.expertise-item.active .expertise-content {
    max-height: 500px;
    padding-top: 2rem;
}

.expertise-content p {
    font-size: 1.1rem;
    color: var(--gray-text);
    line-height: 1.8;
    max-width: 800px;
    margin-left: 4rem;
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .expertise-item:hover {
        padding-left: 0;
    }

    .expertise-header {
        align-items: flex-start;
        gap: 1rem;
    }

    .expertise-number {
        margin-right: 1rem;
        margin-top: 0.3rem;
    }

    .expertise-title {
        font-size: 1.5rem;
        line-height: 1.2;
    }

    .expertise-tag {
        padding: 0.3rem 0.8rem;
        margin-right: 0.5rem;
        font-size: 0.75rem;
        white-space: nowrap;
    }

    .expertise-toggle {
        width: 32px;
        height: 32px;
        font-size: 1.2rem;
        flex-shrink: 0;
    }

    .expertise-content p {
        margin-left: 0;
        font-size: 1rem;
        padding-left: 2rem;
    }
}