:root {
    --holzkohle: #2F4156;
    --columbia-blue: #C8D9E6;
    --tuerkisblau: #567C8D;
    --isabelline: #F5EFEB;
    --weiss: #FFFFFF;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-color: var(--isabelline);
    color: var(--holzkohle);
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

h1 {
    color: var(--tuerkisblau);
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 12px clamp(20px, 6vw, 80px);
    background-color: var(--holzkohle);
    box-shadow: 0 2px 12px rgba(47, 65, 86, 0.1);
}

header > p {
    margin: 0;
    padding: 0;
    background: none;
    line-height: 0;
}

header > p img {
    width: 72px;
    height: auto;
}

header nav ul,
footer nav ul {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

header nav ul {
    justify-content: flex-end;
}

header nav a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 14px;
    border-radius: 999px;
    color: var(--weiss);
    font-weight: 700;
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease;
}

header nav a:hover,
header nav a:focus-visible {
    background-color: var(--columbia-blue);
    color: var(--holzkohle);
}

header nav a:focus-visible,
footer nav a:focus-visible {
    outline: 3px solid var(--columbia-blue);
    outline-offset: 3px;
}

header nav a img {
    display: block;
    width: 30px;
    height: 30px;
    object-fit: contain;
}

main {
    padding: 0 clamp(24px, 8vw, 120px);
}

main section details {
    margin: 12px 0;
    overflow: hidden;
    border: 1px solid var(--columbia-blue);
    border-radius: 10px;
    background-color: var(--weiss);
}

main section details[open] {
    border-color: var(--tuerkisblau);
}

main section details summary {
    padding: 16px 20px;
    color: var(--holzkohle);
    font-weight: 700;
    cursor: pointer;
}

main section details summary:hover {
    background-color: var(--columbia-blue);
}

main section details summary:focus-visible {
    outline: 3px solid var(--tuerkisblau);
    outline-offset: -3px;
}

main section details > p {
    margin: 0;
    padding: 0 20px 18px;
    border-radius: 0;
    background: none;
}