h1 {
    border-bottom: 1px solid var(--gris-fonce);
    margin: 55px 5rem;
}

.expertise-accordion {
    border-bottom: 1px solid #e1e4e8;
    padding: 0 2rem;
}

.expertise-header {
    color: var(--petrole);
    padding: 18px 0;
    font-size: 1.6rem;
    border: none;
    text-align: left;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: color 0.3s ease;
}

.expertise-header:hover,
.expertise-header:focus {
    color: var(--turquoise);
    outline: none;
}

.expertise-header::after {
    content: '+';
    font-size: 1.6rem;
    color: var(--turquoise);
}

.expertise-header.active::after {
    content: '−';
}

.expertise-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    padding-left: 6px;
    color: var(--gris-fonce);
}

.expertise-content p.intro {
    margin: 16px 0 12px 0;
    font-style: normal;
    color: var(--gris-fonce);
}

.expertise-content ul {
    margin: 0 0 24px 24px;
    padding: 0;
    list-style-type: disc;
    color: var(--gris-fonce);
}

.expertise-content ul li {
    margin-bottom: 8px;
}

button {
    background-color: transparent;
}

@media (min-width: 1024px) {
    h1 {
        margin: 80px 10rem;
    }

    .expertise-accordion {
        padding: 0 5rem;
        margin-bottom: 4rem;
    }

    .expertise-header {
        padding: 24px 0;
        font-size: 1.8rem;
    }

    .expertise-content p.intro {
        margin: 24px 0 18px 0;
    }

    .expertise-content ul {
        margin-bottom: 36px;
    }
}