/* ==========================================================================
   digitaalsoeverein.eu — basisthema
   Licht, toegankelijk, zakelijk (overheid/onderwijs-stijl)
   ========================================================================== */

:root {
    /* Kleuren: hoog contrast, WCAG AA/AAA-gericht */
    --color-bg: #ffffff;
    --color-bg-subtle: #f4f6f8;
    --color-text: #1a1d21;
    --color-text-muted: #4a4f57;
    --color-primary: #0b5b8c;        /* blauw, zakelijk, voldoende contrast op wit */
    --color-primary-dark: #073f61;
    --color-accent: #1c7a5e;         /* groen accent, subtiel, voor links/hover */
    --color-border: #d6dbe1;
    --color-focus: #ffbf47;          /* duidelijk zichtbare focus-outline */

    /* Typografie */
    --font-body: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
    --font-size-base: 1.0625rem;     /* iets groter dan 16px voor leesbaarheid */
    --line-height-base: 1.6;

    /* Layout */
    --max-width: 1100px;
    --spacing-unit: 1rem;
    --radius: 4px;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 100%;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
}

/* Zichtbare focus-states voor toetsenbordnavigatie — niet weglaten voor toegankelijkheid */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

a {
    color: var(--color-primary);
    text-decoration: underline;
}

a:hover {
    color: var(--color-primary-dark);
}

h1, h2, h3, h4 {
    line-height: 1.25;
    color: var(--color-text);
}

/* ---- Header / navigatie ---- */

.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.site-nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-unit);
}

.site-logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: calc(var(--spacing-unit) * 1.5);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
}

.nav-links a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ---- Hero / intro ---- */

.hero {
    background: var(--color-bg-subtle);
    padding: calc(var(--spacing-unit) * 3) calc(var(--spacing-unit) * 1.5);
    border-bottom: 1px solid var(--color-border);
}

.hero-inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
}

.hero .intro {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    max-width: 640px;
}

/* ---- Content-secties ---- */

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 1.5);
}

.body-content > * + * {
    margin-top: calc(var(--spacing-unit) * 1.5);
}

/* ---- Link-cards (voor verwijzingen naar blog/app-registry/community) ---- */

.link-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-unit);
    margin-top: var(--spacing-unit);
}

.link-card {
    display: block;
    padding: calc(var(--spacing-unit) * 1.25);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.link-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(11, 91, 140, 0.1);
}

.link-card h3 {
    margin: 0 0 0.5rem 0;
    color: var(--color-primary);
}

.link-card p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* ---- Footer ---- */

.site-footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-subtle);
    margin-top: calc(var(--spacing-unit) * 3);
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 1.5);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ---- Skip-link (toegankelijkheid: toetsenbordgebruikers kunnen navigatie overslaan) ---- */

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--color-primary);
    color: #fff;
    padding: 0.75rem 1.25rem;
    z-index: 1000;
    text-decoration: none;
}

.skip-link:focus {
    left: var(--spacing-unit);
    top: var(--spacing-unit);
}