body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f2eee6;
    color: #222222;
}

header {
    background-color: #1f3552;
    color: white;
    padding: 15px 20px;
    border-bottom: 3px solid #b08d57;
}

.bovenkant {
    max-width: 1000px;
    margin: auto;
}

.balk {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.titel-link {
    color: white;
    text-decoration: none;
    font-size: 24px;
    font-weight: bold;
    display: flex;
    align-items: center;
}

.logo {
    width: 28px;
    height: 28px;
    margin-right: 8px;
    background-color: white;
    border-radius: 4px;
    padding: 3px;
}

.menu {
    margin-top: 10px;
}

.menu a {
    color: white;
    text-decoration: none;
    margin-left: 15px;
    font-weight: bold;
}

.menu a:hover {
    text-decoration: underline;
}

.melding {
    background-color: #2b4668;
    color: white;
    text-align: center;
    padding: 10px;
    font-size: 15px;
}

main {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 20px;
}

.vak {
    background-color: white;
    border: 1px solid #d3cab8;
    border-radius: 10px;
    padding: 25px;
}

h1 {
    text-align: center;
    color: #1f3552;
    margin-top: 0;
}

.uitleg {
    text-align: center;
    margin-bottom: 30px;
    color: #444444;
}

.formule-plaatje,
.driehoek-plaatje,
.goniometrie-plaatje {
    display: block;
    margin: 0 auto 25px auto;
    width: 350px;
    max-width: 100%;
    border: 1px solid #d3cab8;
    border-radius: 8px;
    padding: 8px;
    background-color: #faf8f4;
}

.knoppen {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.knop-vak {
    display: block;
    background-color: #faf8f4;
    color: #222222;
    text-decoration: none;
    border: 1px solid #d3cab8;
    border-radius: 10px;
    padding: 20px;
}

.knop-vak:hover {
    background-color: #f0eadf;
}

.teken {
    display: inline-block;
    width: 45px;
    height: 45px;
    line-height: 45px;
    text-align: center;
    border: 1px solid #1f3552;
    border-radius: 8px;
    font-weight: bold;
    color: #1f3552;
    margin-bottom: 10px;
}

.knop-vak h3 {
    margin-top: 0;
    margin-bottom: 10px;
    color: #1f3552;
}

.knop-vak p {
    margin: 0;
    font-size: 14px;
}

.formulier {
    max-width: 700px;
    margin: auto;
}

.invoer-vak {
    margin-bottom: 18px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: bold;
    color: #1f3552;
}

input,
select {
    width: 100%;
    padding: 10px;
    border: 1px solid #cbbfa8;
    border-radius: 6px;
    font-size: 15px;
    background-color: white;
    box-sizing: border-box;
}

button {
    background-color: #1f3552;
    color: white;
    border: none;
    padding: 12px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 15px;
}

button:hover {
    background-color: #16273c;
}

.resultaat {
    margin-top: 25px;
    padding: 15px;
    border: 1px solid #d3cab8;
    background-color: #faf8f4;
    border-left: 4px solid #b08d57;
    border-radius: 6px;
    min-height: 30px;
}

.terug-link {
    display: inline-block;
    margin-top: 20px;
    color: #1f3552;
    font-weight: bold;
}

.info-vakken {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.info-vak {
    background-color: #faf8f4;
    border: 1px solid #d3cab8;
    border-radius: 10px;
    padding: 20px;
}

.info-vak h2 {
    margin-top: 0;
    color: #1f3552;
}

.vraag-vak {
    background-color: #faf8f4;
    border: 1px solid #d3cab8;
    border-radius: 10px;
    padding: 18px;
    margin-bottom: 15px;
}

.vraag-vak h2 {
    margin-top: 0;
    color: #1f3552;
    font-size: 20px;
}

footer {
    margin-top: 50px;
    padding: 20px;
    text-align: center;
    background-color: #e7dfd2;
    color: #555555;
    border-top: 1px solid #d3cab8;
}

@media screen and (max-width: 700px) {
    .balk {
        flex-direction: column;
        align-items: flex-start;
    }

    .menu {
        margin-top: 15px;
    }

    .menu a {
        margin-left: 0;
        margin-right: 15px;
    }
}