/* ==========================================================================
   Byterider — gedeelde stylesheet
   Mobile-first. Design tokens als CSS-variabelen in :root.
   ========================================================================== */

/* --- Design tokens ------------------------------------------------------ */
:root {
  --color-bg: #ffffff;
  --color-ink: #1a2332;
  --color-accent: #0f6b5c;
  --color-accent-tint: #eaf3f1;
  --color-border: #e5e7eb;
  --color-muted: #6b7280;

  --font-display: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  /* Ondersteunende tokens */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;

  --radius: 10px;
  --max-width: 1080px;
  --header-height: 124px;
}

/* --- Reset / basis ------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 1rem;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Zichtbare focus-states voor toegankelijkheid */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* --- Typografie --------------------------------------------------------- */
h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
  font-weight: 600;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.15rem;
}

p {
  margin: 0 0 var(--space-2);
}

/* --- Layout hulpmiddelen ------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section {
  padding-block: var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type {
  border-bottom: none;
}

.section__intro {
  max-width: 60ch;
  color: var(--color-muted);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin: 0 0 var(--space-1);
}

/* --- Header / navigatie ------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--color-ink);
  margin-right: auto;
}

.brand:hover {
  text-decoration: none;
}

.brand__logo {
  height: 92px;
  width: auto;
}

/* Nav toggle (hamburger) — verborgen op desktop */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  margin-inline: auto;
  background: var(--color-ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--color-ink);
  font-weight: 500;
  padding-block: var(--space-1);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.site-nav a:hover {
  text-decoration: none;
  color: var(--color-accent);
}

/* Actieve pagina gemarkeerd */
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Taalkeuze (NL | EN) — compact, buiten de nav zodat hij op mobiel zichtbaar blijft */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.lang-switch a {
  color: var(--color-muted);
  padding: var(--space-1) 0.15rem;
}

.lang-switch a:hover {
  text-decoration: none;
  color: var(--color-accent);
}

.lang-switch a[aria-current] {
  color: var(--color-accent);
  font-weight: 600;
}

.lang-switch__sep {
  color: var(--color-border);
}

/* --- Hero --------------------------------------------------------------- */
.hero {
  padding-block: var(--space-6) var(--space-5);
  background: var(--color-accent-tint);
  border-bottom: 1px solid var(--color-border);
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
  font-weight: 500;
  color: var(--color-accent);
  margin-top: calc(var(--space-2) * -0.5);
  margin-bottom: var(--space-3);
}

.hero__lead {
  max-width: 60ch;
  font-size: 1.15rem;
  color: var(--color-ink);
}

/* --- Kaarten ------------------------------------------------------------ */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-3);
}

.card {
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.card h3,
.card h4,
.card h5 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.25;
  font-weight: 600;
  margin: 0 0 var(--space-1);
}

.card p {
  color: var(--color-muted);
  margin-bottom: 0;
}

.card .eyebrow {
  color: var(--color-accent);
  margin: 0 0 var(--space-1);
}

/* --- Graad-blokken (secundair onderwijs) -------------------------------- */
.grade-block {
  margin-top: var(--space-5);
}

.grade-block:first-of-type {
  margin-top: var(--space-4);
}

.grade-block__title {
  font-size: 1.4rem;
  padding-bottom: var(--space-1);
  border-bottom: 2px solid var(--color-accent-tint);
  margin-bottom: var(--space-2);
}

/* --- Badges / tags (mono-font) ------------------------------------------ */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-3);
  padding: 0;
  list-style: none;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-accent-tint);
  color: var(--color-ink);
  white-space: nowrap;
}

/* --- Aanpak-lijst ------------------------------------------------------- */
.approach-list {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0;
  display: grid;
  gap: var(--space-2);
  max-width: 60ch;
}

.approach-list li {
  padding-left: var(--space-3);
  position: relative;
  color: var(--color-muted);
}

.approach-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.approach-list strong {
  color: var(--color-ink);
}

/* --- CTA ---------------------------------------------------------------- */
.cta {
  text-align: center;
  background: var(--color-accent-tint);
}

.cta .section__intro {
  margin-inline: auto;
}

.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: #ffffff;
  border: 2px solid var(--color-accent);
  transition: background 0.15s ease, color 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  background: #0a4d43;
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
}

.btn--ghost:hover {
  background: var(--color-accent);
  color: #ffffff;
}

/* --- Contactgegevens ---------------------------------------------------- */
.contact-list {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0 0;
  display: grid;
  gap: var(--space-2);
}

.contact-list dt {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

.contact-list dd {
  margin: 0.15rem 0 0;
  font-size: 1.05rem;
}

/* --- Footer ------------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: #d8dee6;
  padding-block: var(--space-3);
}

.site-footer a {
  color: #ffffff;
}

.site-footer__bottom {
  margin: 0;
  font-size: 0.85rem;
  color: #9aa5b1;
  text-align: center;
}

/* ==========================================================================
   Responsive — mobile-first, breakpoints op 768px, 992px en 1024px
   ========================================================================== */

/* Onder 992px: hamburger menu tonen, nav standaard verborgen.
   Vier navigatie-items passen pas vanaf ~992px naast het logo. */
@media (max-width: 991.98px) {
  :root {
    --header-height: 84px;
  }

  .brand__logo {
    height: 60px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    display: none;
  }

  .site-nav[data-open="true"] {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding: var(--space-1) var(--space-3) var(--space-3);
  }

  .site-nav li {
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav a {
    display: block;
    padding: var(--space-2) 0;
    border-bottom: none;
  }

  .site-nav a[aria-current="page"] {
    border-bottom: none;
    padding-left: var(--space-1);
    border-left: 3px solid var(--color-accent);
  }
}

/* Vanaf 768px: tablet — 2 koloms grids */
@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Vanaf 1024px: desktop — 3 koloms kaartgrid */
@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Respecteer reduced-motion voorkeur */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    transition: none !important;
  }
}