:root {
    --basiskleur: #184e7a;
    --basiskleur-donker: #0d0e41;
    --basiskleur-licht: #56a0aa;
    --achtergrond-kleur: #d2d3c5;
    --section-kleur: #c7c7b9;
}

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    font-family: "Noto Sans Display", 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    line-height: 1.5;
    background-color: var(--achtergrond-kleur);
}

h1,
h2,
h3,
nav {
    font-family: "Ysabeau Office", 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-weight: bold;
}

header h1 {
    margin: 0 auto;
    text-align: center;
    float: inline-start;
    padding: 0.75em;
}

header img {
    width: clamp(1em, 3em + 5vw, 5em);
}

nav {
    background-color: var(--basiskleur);
    margin-bottom: 1em;
}

nav ul {
    list-style: none;
    font-size: clamp(0.75em, 0.75em + 1vw, 1.25em);
}

nav ul li {
    text-align: end;
}

nav ul li a {
    box-shadow: 0 0 1px var(--basiskleur-donker);
    padding: 0.5em 1em;
    display: block;
    text-decoration: none;
    color: #fff;
}

nav ul li.actief a {
    background-color: var(--basiskleur-donker);
}

nav ul li a:hover {
    background-color: var(--basiskleur-licht);
}

section {
    margin-bottom: 2em;
}

img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    max-width: 45em;
    display: block;
    margin: auto;
}

p {
    margin-bottom: 0.5em;
}

a {
    color: var(--basiskleur);
}

span.titel {
    font-style: italic;
}

main {
    max-width: 80em;
    margin: auto;
    padding: 1em;
}

section.introductie p {
    margin-bottom: 2em;
}

section.concert {
    box-shadow: 0 0 1px var(--basiskleur-donker);
    border-radius: 1em;
    padding: 1em;
    background-color: var(--section-kleur);
}

p.disclaimer {
    font-size: 85%;
    margin-top: 2em;
}

.onzichtbaar {
    visibility: hidden;
}

section.kennismaking img {
    margin: 1.5em auto;
}

section.year {
    box-shadow: 0 0 1px var(--basiskleur-donker);
    border-radius: 1em;
    padding: 1em;
    background-color: var(--section-kleur);
}

section.year h3 {
    font-size: 1.75em;
    color: var(--basiskleur);
}

section.year span.omschrijving {
    font-weight: 600;
}

section.year div:not(div:last-of-type) {
    padding-bottom: 1em;
    border-bottom: 2px dashed var(--basiskleur);
}

section.year div:not(div:first-of-type) {
    padding-top: 1em;
}

form {
    display: flex;
    flex-direction: column;
}

#naam {
    max-width: 20ch;
}

#mail {
    max-width: 35ch;
}

#vraag {
    max-width: 50em;
    height: 5em;
}

form input,
form textarea,
form div {
    margin-bottom: 0.5em;
}

form button {
    width: fit-content;
    padding: 0.2em 0.5em;
}

footer {
    background-color: var(--basiskleur);
    color: #fff;
    padding: 0.5em;
    margin-top: 2em;
    display: flex;
    gap: 2em;
    flex-wrap: wrap;
    justify-content: end;
}

footer a img {
    height: 1.5em;
    margin: 0;
}

@media (min-width: 30em) {
    header h1 {
        float: none;
        padding: 0;
    }

    nav {
        background-color: var(--basiskleur);
        padding: 5px 10px;
        margin-bottom: 2em;
    }

    nav ul {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        justify-content: center;
    }

    nav ul li a {
        padding: 5px 10px;
        border-radius: 10px;
    }

    section.year div {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1em;
    }

    section.year p.locatie {
        grid-column: 2 / 3;
        text-align: end;
    }

    section.year p:not(p.locatie) {
        grid-row: 1 / 3;
    }

    section.year img {
        grid-column: 1 / 3;
    }
}

@media (min-width: 50em) {
    section.introductie {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1em;
    }

    section.introductie img {
        grid-column: 2 / 3;
        grid-row: 1 / 3;
    }

    section.introductie p {
        grid-column: 1 / 2;
    }

    section.concert {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1em;
    }

    section.concert p {
        grid-column: 2 / 3;
    }

    section.concert img {
        grid-column: 1 / 2;
        grid-row: 1 / 7;
    }

    section.kennismaking {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1em;
        grid-auto-flow: dense;
    }

    section.kennismaking img {
        margin: 0;
    }

    section.kennismaking .right {
        grid-column: 2 / 3;
    }

    section.kennismaking .left {
        grid-column: 1 / 2;
    }

    section.year div {
        grid-template-columns: 1fr 1fr 1fr;
    }

    section.year p.locatie {
        grid-column: 2 / 3;
        text-align: center;
    }

    section.year img {
        grid-column: 3 / 4;
        grid-row: 1 / 5;
    }
}