@font-face {
  font-family: 'Open Sans';
  font-style: normal;
  font-weight: 300 800;
  font-stretch: 100%;
  font-display: swap;
  src: url('fonts/open-sans-latin.woff2') format('woff2');
}

:root {
  --teal: #1A6B6A;
  --teal-dark: #134E4E;
  --teal-light: #D8ECEC;
  --teal-pale: #F4F9F9;
  --teal-border: #B8D8D8;
  --ink: #212828;
  --muted: #465151;
  --white: #FFFFFF;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Open Sans', system-ui, -apple-system, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

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

a { color: var(--teal); }
a:hover { color: var(--teal-dark); }
a:focus-visible { outline: 3px solid var(--teal-dark); outline-offset: 3px; border-radius: 4px; }

h1, h2, h3 { color: var(--teal-dark); margin: 0; }
p { margin: 0; }

.skip-link {
  position: absolute; left: -9999px; top: 8px;
  background: var(--teal-dark); color: var(--white); padding: 8px 16px; border-radius: 8px; z-index: 10;
}
.skip-link:focus { left: 8px; color: var(--white); }

/* Layout */
.section { display: flex; justify-content: center; }
.wrap { width: 100%; max-width: 1120px; padding: 72px 32px; }
.bg-light { background: var(--teal-light); }
.bg-pale { background: var(--teal-pale); }
.bg-dark { background: var(--teal-dark); color: var(--white); }
.bg-ink { background: var(--ink); color: var(--white); }

.eyebrow {
  font-weight: 700; font-size: 14px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--teal-dark);
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--teal); color: var(--white);
  text-decoration: none; font-weight: 700; font-size: 18px;
  padding: 16px 32px; border-radius: 999px;
  transition: background-color .15s ease;
}
.btn:hover, .btn:focus-visible { background: var(--teal-dark); color: var(--white); }
.btn-sm { font-size: 16px; padding: 12px 24px; }
.btn-lg { font-size: 20px; padding: 20px 40px; }

.text-link { color: var(--teal-dark); font-weight: 600; }

/* Header */
.site-header { border-bottom: 1px solid var(--teal-light); background: var(--white); }
.site-header .wrap {
  padding: 16px 32px;
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand img { width: 48px; height: 44px; object-fit: contain; }
.brand span { font-weight: 700; font-size: 18px; color: var(--teal-dark); }
.header-right { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.header-right .umc { height: 28px; width: auto; }

/* Hero */
.hero .wrap { display: flex; flex-wrap: wrap; gap: 48px; align-items: center; }
.hero-text { flex: 1 1 480px; display: flex; flex-direction: column; gap: 24px; }
.hero h1 { font-size: 52px; line-height: 1.1; font-weight: 800; }
.hero .lead { font-size: 20px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.hero-actions .text-link { padding: 12px 8px; }
.hero-visual { flex: 0 1 300px; display: flex; justify-content: center; }
.phone {
  width: 260px; height: 520px; border-radius: 40px; background: var(--teal-dark); padding: 14px; display: flex;
}
.phone img { flex: 1; width: 100%; height: 100%; border-radius: 28px; object-fit: cover; }

/* Researcher */
.researcher .wrap { padding-top: 48px; padding-bottom: 48px; display: flex; flex-wrap: wrap; gap: 24px; align-items: center; }
.researcher img { flex: none; width: 96px; height: 96px; border-radius: 50%; object-fit: cover; }
.researcher .text { flex: 1 1 400px; font-size: 18px; }
.researcher .text p + p { margin-top: 4px; }

/* Waarom */
.why .wrap { display: flex; flex-wrap: wrap; gap: 48px; }
.why h2 { flex: 1 1 320px; }
.why .body { flex: 2 1 520px; display: flex; flex-direction: column; gap: 16px; font-size: 18px; }

h2 { font-size: 36px; line-height: 1.2; font-weight: 800; }

/* Hoe werkt meedoen */
.how .wrap { display: flex; flex-direction: column; gap: 32px; }
.how .intro { font-size: 18px; max-width: 720px; }
.groups { display: flex; flex-wrap: wrap; gap: 24px; }
.group {
  flex: 1 1 440px; border: 2px solid var(--teal); border-radius: 20px; padding: 32px;
  display: flex; flex-direction: column; gap: 12px;
}
.group.alt { border-color: var(--teal-border); }
.group .eyebrow { color: var(--teal); }
.group h3 { font-size: 24px; }
.group ol { margin: 0; padding-left: 22px; display: flex; flex-direction: column; gap: 8px; }
.how h3.timeline-title { font-size: 22px; margin-top: 16px; }
.timeline { margin: 0; padding-left: 22px; display: flex; flex-direction: column; gap: 6px; font-size: 18px; }
.timeline strong { color: var(--teal-dark); }
.how .note { font-size: 16px; color: var(--muted); }
.center { text-align: center; }

/* Vergoeding */
.reward .wrap { padding-top: 24px; padding-bottom: 24px; display: flex; flex-wrap: wrap; gap: 20px; align-items: center; }
.reward .amount { font-size: 36px; font-weight: 800; line-height: 1; }
.reward .text { flex: 1 1 420px; font-size: 16px; }

/* Aanmelden */
.signup .wrap {
  max-width: 760px; display: flex; flex-direction: column; gap: 20px; align-items: center; text-align: center;
}
.signup .wrap > p { font-size: 18px; }
.signup .umc { margin-top: 12px; height: 40px; width: auto; }

/* Footer */
.site-footer .wrap {
  padding: 40px 32px; display: flex; flex-wrap: wrap; gap: 24px; justify-content: space-between; align-items: flex-start; font-size: 15px;
}
.site-footer .col { display: flex; flex-direction: column; gap: 4px; max-width: 420px; }
.site-footer a { color: var(--white); }
.site-footer a:hover { color: var(--teal-light); }

/* Mobile */
@media (max-width: 720px) {
  .wrap { padding: 48px 16px; }
  .site-header .wrap { padding: 12px 16px; }
  .researcher .wrap { padding-top: 32px; padding-bottom: 32px; }
  .reward .wrap { padding-top: 24px; padding-bottom: 24px; }
  .site-footer .wrap { padding: 32px 16px; }
  .hero h1 { font-size: 36px; }
  .hero .lead { font-size: 18px; }
  h2 { font-size: 28px; }
  .hero-text, .why h2, .why .body, .group, .researcher .text, .reward .text { flex-basis: 100%; }
  .group { padding: 24px; }
  .phone { width: 220px; height: 440px; border-radius: 34px; padding: 12px; }
  .phone img { border-radius: 24px; }
  .hero-actions .btn, .how .btn, .signup .btn { display: block; width: 100%; text-align: center; }
  .btn-lg { font-size: 18px; padding: 18px 24px; }
  .brand span { display: none; }
  .header-right { gap: 16px; }
  .header-right .umc { height: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}