body {
    background-color: var(--light-grey);
}

.flex {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    display: flex;
    flex-direction: column;
    flex: 1;
}

header.professional-journey h1 {
    margin: 15px;
}

header h1,
footer h4 {
    margin: 0;
}

.journey-intro,
.collapsible-container {
    width: min(800px, calc(100% - 32px));
    margin-left: auto;
    margin-right: auto;
}

.journey-intro h1 {
    font-family: var(--title-font-family);
    font-size: 24px;
    text-align: center;
    color: var(--dark-grey);
    margin: 0;
    padding: 30px 0 10px;
}

.journey-intro p {
    line-height: 1.6;
}

main .collapsible,
.content {
    font-family: var(--font-family);
}

.collapsible {
    background-color: var(--dark-grey);
    color: white;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    margin: 30px 0;
    box-sizing: border-box;
}

.collapsible:focus-visible {
    outline: 3px solid var(--red);
    outline-offset: 3px;
}

.collapsible.active {
    margin: 0;
}

.collapsible-container .collapsible.active:first-child {
    margin-top: 30px;
}

.view-details {
    display: inline-block;
    font-size: 0.8em;
    padding: 2px 20px;
    background-color: var(--second-dark-grey);
    border-radius: 3px;
}

.collapsible:hover .view-details,
.hide-details:hover {
    color: white;
}

.collapsible.active .view-details {
    display: none;
}

.active,
.collapsible:hover {
    background-color: var(--grey);
    color: black;
}

.content {
    padding: 0 18px;
    display: none;
    overflow: hidden;
    background-color: var(--light-green);
}

.content.open {
    display: block;
}

.hide-details {
    display: block;
    margin: 18px 0;
    padding: 6px 20px;
    border: none;
    border-radius: 3px;
    background-color: var(--second-dark-grey);
    color: white;
    font: inherit;
    font-size: 0.8em;
    cursor: pointer;
}

.hide-details:focus-visible {
    outline: 3px solid var(--red);
    outline-offset: 3px;
}

footer h4 {
    margin: 10px;
}

@media (max-width: 600px) {
    .collapsible {
        padding: 14px;
    }

    .journey-intro h1 {
        font-size: 20px;
    }
}