/* StudyBlox – gedeelde stijl (tokens uit het StudyBlox Design System) */
:root {
  --background: oklch(0.974 0.008 103);
  --foreground: oklch(0.245 0.031 149);
  --card: oklch(0.995 0.004 103);
  --primary: oklch(0.47 0.105 147);
  --primary-foreground: oklch(0.974 0.008 103);
  --secondary: oklch(0.94 0.048 108);
  --secondary-foreground: oklch(0.31 0.06 146);
  --muted: oklch(0.94 0.012 104);
  --muted-foreground: oklch(0.44 0.023 150);
  --body: oklch(0.38 0.027 150);
  --brand: oklch(0.874 0.147 121);
  --brand-foreground: oklch(0.29 0.07 147);
  --border: oklch(0.86 0.016 119 / 68%);
  --input: oklch(0.86 0.016 119);
  --subject-language: oklch(0.58 0.155 15);
  --subject-math: oklch(0.62 0.08 260);
  --subject-history: oklch(0.67 0.09 61);
  --subject-geo: oklch(0.65 0.08 215);
  --shadow-panel: 0 20px 70px -42px color-mix(in oklab, var(--foreground) 28%, transparent);
  --font-display: "Sora", "Manrope", system-ui, sans-serif;
  --font-sans: "Manrope", system-ui, sans-serif;
  --pad: clamp(20px, 5.5vw, 80px);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--background); color: var(--foreground); font-family: var(--font-sans); font-size: 16px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; letter-spacing: -0.02em; }
p { margin: 0; }
a { color: var(--primary); }
img { max-width: 100%; }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; border-radius: 6px; }
.wrap { padding-inline: var(--pad); max-width: 1440px; margin-inline: auto; }
.kicker { font-size: 13px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--primary); }
.lead { font-size: clamp(17px, 1.6vw, 20px); color: var(--body); line-height: 1.5; }
.muted { color: var(--body); }

/* Knoppen */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 14px 26px; border-radius: 999px; font-weight: 700; font-size: 16px; text-decoration: none; border: none; cursor: pointer; font-family: var(--font-sans); transition: transform .15s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--primary); color: var(--primary-foreground); }
.btn-brand { background: var(--brand); color: var(--brand-foreground); font-size: 18px; padding: 18px 32px; }
@media (prefers-reduced-motion: reduce) { .btn { transition: none; } .btn:hover { transform: none; } html { scroll-behavior: auto; } }

/* Header */
.site-header { display: flex; align-items: center; justify-content: space-between; height: 84px; }
.wordmark { font-family: var(--font-display); font-weight: 700; font-size: 24px; color: var(--foreground); text-decoration: none; letter-spacing: -0.01em; }
.site-nav { display: flex; align-items: center; gap: 28px; font-size: 15px; font-weight: 600; }
.site-nav a:not(.btn) { color: var(--foreground); text-decoration: none; }
@media (max-width: 760px) { .site-nav a:not(.btn) { display: none; } .site-nav .btn { min-height: 44px; padding: 10px 18px; } }

/* Kaarten */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 20px; }
.panel { background: var(--card); border: 1px solid var(--border); border-radius: 24px; box-shadow: var(--shadow-panel); }