:root {
    --green: #1b5e20;
    --green-light: #e8f5e9;
    --ball: #d4e157;
    --text: #1c1c1c;
    --bg: #f7f9f7;
    --radius: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    font-size: 1.125rem;
    line-height: 1.5;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header + navigatie: mobile first, horizontaal scrollbaar, grote tikdoelen */
.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--green);
    color: #fff;
    padding-top: env(safe-area-inset-top);
    box-shadow: 0 2px 6px rgba(0,0,0,.25);
}
.brand {
    display: block;
    padding: .6rem 1rem .2rem;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.2rem;
}
.slagen ul {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: .5rem;
    margin: 0;
    padding: .5rem 1rem .75rem;
    list-style: none;
}
.slagen li { margin: 0; }
.slagen li:last-child:nth-child(odd) { grid-column: 1 / -1; }
.slagen a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: .5rem .75rem;
    text-align: center;
    color: #fff;
    text-decoration: none;
    border: 2px solid rgba(255,255,255,.5);
    border-radius: var(--radius);
    font-weight: 600;
}
.slagen a.active {
    background: var(--ball);
    border-color: var(--ball);
    color: var(--green);
}

/* Inhoud */
.content {
    flex: 1;
    width: 100%;
    max-width: 48rem;
    margin: 0 auto;
    padding: 1rem;
}
.content h1 { font-size: 1.6rem; margin: .5rem 0 1rem; color: var(--green); }
.content h2 { font-size: 1.3rem; color: var(--green); }

/* Tips als grote leesbare kaarten (ook in een lijst te gebruiken) */
.content ul, .content ol { padding: 0; margin: 0; list-style: none; }
.content li, .tip {
    background: #fff;
    border-left: 6px solid var(--ball);
    border-radius: var(--radius);
    padding: .9rem 1rem;
    margin-bottom: .75rem;
    box-shadow: 0 1px 3px rgba(0,0,0,.12);
}

.site-footer {
    text-align: center;
    padding: 1rem 1rem calc(1rem + env(safe-area-inset-bottom));
    font-size: .875rem;
    color: #555;
}

/* Tablet en groter */
@media (min-width: 600px) {
    body { font-size: 1.2rem; }
    .site-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding-left: 1rem;
        padding-right: 1rem;
    }
    .brand { padding: .75rem 0; }
    .slagen ul { display: flex; flex-wrap: wrap; justify-content: flex-end; padding: .75rem 0; }
    .slagen a { padding: .5rem 1rem; }
    .slagen li:last-child:nth-child(odd) { grid-column: auto; }
    .content { padding: 1.5rem; }
}

/* Desktop: tips in twee kolommen */
@media (min-width: 960px) {
    .content { max-width: 60rem; }
    .content ul, .content ol {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    .content li { margin: 0; }
}

@media (prefers-color-scheme: dark) {
    :root { --bg: #121812; --text: #eee; }
    .content li, .tip { background: #1d281d; }
    .content h1, .content h2 { color: var(--ball); }
    .site-footer { color: #aaa; }
}