/* ==========================================================
   Kempische Duikschool – stylesheet
   Concept: scrollen = afdalen. Elke sectie is een diepere waterlaag.
   Kleuren pas je aan in :root.
   ========================================================== */

:root {
  --oppervlak: #EAF2F8;
  --riet: #C9DEEE;
  --meer: #9FC6E3;
  --diep: #3A74A8;
  --dieper: #1E4F82;
  --bodem: #10345C;
  --abyss: #0A2140;
  --boei: #F2C230;      /* accentkleur: signaalboei-geel */
  --inkt: #0E2540;      /* tekst op lichte lagen */
  --licht: #F2F7FB;     /* tekst op donkere lagen */
  --koppen: "Bricolage Grotesque", "Arial Narrow", sans-serif;
  --tekst: "Atkinson Hyperlegible", system-ui, sans-serif;
  --max: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--tekst);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--inkt);
  background: var(--abyss);
}

img { max-width: 100%; height: auto; display: block; }
h1, h2, h3 { font-family: var(--koppen); line-height: 1.05; margin: 0 0 .5em; letter-spacing: -.015em; }
h1 { font-size: clamp(2.6rem, 9vw, 5.4rem); font-weight: 800; }
h2 { font-size: clamp(1.9rem, 5.5vw, 3rem); font-weight: 800; }
h3 { font-size: 1.3rem; font-weight: 700; letter-spacing: 0; }
p { margin: 0 0 1em; max-width: 38em; }
a { color: inherit; text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--boei); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--boei); color: var(--inkt); padding: 8px 14px; z-index: 100; }
.skip-link:focus { left: 10px; top: 10px; }

/* ---------- Waterlagen ---------- */
.laag { padding: clamp(64px, 11vw, 120px) 0; }
.laag-0 { background: var(--oppervlak); }
.laag-1 { background: var(--riet); }
.laag-2 { background: var(--meer); }
.laag-3 { background: var(--diep); color: var(--licht); }
.laag-4 { background: var(--dieper); color: var(--licht); }
.laag-5 { background: var(--bodem); color: var(--licht); }
.laag-6 { background: var(--abyss); color: var(--licht); }

/* ---------- Header ---------- */
.site-header { background: var(--oppervlak); position: relative; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 72px; padding-top: 6px; padding-bottom: 6px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--koppen); font-weight: 800; font-size: 1.15rem; }
.logo img { height: 80px; width: auto; display: block; }
.main-nav ul { list-style: none; display: flex; align-items: center; gap: 6px; margin: 0; padding: 0; }
.main-nav a { display: block; padding: 8px 12px; text-decoration: none; font-weight: 700; border-radius: 6px; }
.main-nav a:hover, .main-nav a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 2px; }
.nav-toggle { display: none; font: inherit; font-weight: 700; background: none; border: 2px solid var(--inkt); border-radius: 6px; padding: 6px 12px; color: var(--inkt); }
@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .logo img { height: 56px; }
  .main-nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--oppervlak); padding: 8px 20px 20px; z-index: 40; border-bottom: 2px solid var(--inkt); }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; align-items: stretch; }
}

/* ---------- Knoppen ---------- */
.btn {
  display: inline-block; padding: 15px 26px; border-radius: 8px;
  background: var(--boei); color: var(--inkt);
  font-weight: 700; text-decoration: none; font-size: 1.05rem;
  box-shadow: 0 3px 0 rgba(14, 37, 64, .35);
}
.btn:hover { background: #F7D35C; }
.btn:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(14, 37, 64, .35); }
.acties { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 24px; margin-top: 28px; }
.link-sterk { font-weight: 700; }

/* ---------- Hero ---------- */
.hero { padding-top: clamp(40px, 8vw, 90px); padding-bottom: 0; }
.hero h1 { max-width: 11ch; }
.hero .intro { font-size: 1.25rem; }
.hero { position: relative; }
.waterlijn { display: block; position: relative; z-index: 1; width: 100%; height: 60px; margin-top: clamp(48px, 8vw, 90px); overflow: hidden; }
/* Twee golflagen schuiven in tegenovergestelde richting; de tekening is 2x zo breed en herhaalt zich naadloos. */
.golf { position: absolute; left: 0; bottom: -1px; width: 200%; height: 100%; display: block; }
.golf-voor { animation: golf-links 16s linear infinite; }
.golf-achter { animation: golf-rechts 26s linear infinite; }
@keyframes golf-links { to { transform: translateX(-50%); } }
@keyframes golf-rechts { from { transform: translateX(-50%); } to { transform: translateX(0); } }
@media (prefers-reduced-motion: reduce) { .golf { animation: none; } }
.training {
  margin-top: 36px; padding-left: 16px; border-left: 4px solid var(--boei);
  font-size: 1rem; max-width: 30em;
}

/* ---------- Twijfel (FAQ) ---------- */
.vragen { margin-top: 28px; max-width: 46em; border-top: 2px solid var(--inkt); }
.vragen details { border-bottom: 2px solid var(--inkt); }
.vragen summary {
  cursor: pointer; list-style: none; padding: 18px 40px 18px 0; position: relative;
  font-family: var(--koppen); font-weight: 700; font-size: 1.25rem;
}
.vragen summary::-webkit-details-marker { display: none; }
.vragen summary::after { content: "+"; position: absolute; right: 6px; top: 12px; font-size: 1.8rem; font-weight: 400; }
.vragen details[open] summary::after { content: "–"; }
.vragen details p { padding-bottom: 8px; }

/* ---------- Traject ---------- */
.traject { list-style: none; margin: 0; padding: 0; counter-reset: stap; }
.traject > li { counter-increment: stap; }
.traject .stap { display: grid; grid-template-columns: 64px 1fr; gap: 0 22px; }
.traject .stap::before {
  content: counter(stap);
  font-family: var(--koppen); font-weight: 800; font-size: 3.4rem; line-height: .9;
  opacity: .55;
}
.traject h3 { font-size: clamp(1.5rem, 4vw, 2rem); }
.plaatsen { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 4px 0 0; }
.plaatsen li { border: 2px solid currentColor; border-radius: 999px; padding: 4px 14px; font-weight: 700; font-size: .95rem; }

/* ---------- Club ---------- */
.club-grid { display: grid; gap: 40px; grid-template-columns: 1fr; }
@media (min-width: 820px) { .club-grid { grid-template-columns: 1.2fr 1fr; align-items: start; } }
.lijst { list-style: none; padding: 0; margin: 0; }
.lijst li { padding: 14px 0; border-bottom: 1px solid rgba(242, 247, 251, .25); }
.lijst li:first-child { border-top: 1px solid rgba(242, 247, 251, .25); }
.lijst strong { display: block; font-family: var(--koppen); font-size: 1.15rem; }

/* ---------- Slot-oproep ---------- */
.oproep h2 { font-size: clamp(2.2rem, 7vw, 4rem); max-width: 14ch; }
.oproep .acties a:not(.btn) { color: var(--licht); }

/* ---------- Praktisch / contact ---------- */
.twee { display: grid; gap: 40px; }
@media (min-width: 820px) { .twee { grid-template-columns: 1fr 1fr; } }
.kader { border: 2px solid currentColor; border-radius: 10px; padding: 26px; }
.kader ul { padding-left: 1.2em; margin: 0 0 1em; }
.stappen { padding-left: 1.4em; margin: 0; }
.stappen li { padding-left: 6px; margin-bottom: 14px; }
.stappen li::marker { font-family: var(--koppen); font-weight: 800; }
.gegevens { list-style: none; padding: 0; margin: 0; font-size: 1.15rem; }
.gegevens li { margin-bottom: 12px; }

/* ---------- Duiker (dieptemeter) ----------
   Zwemt rechts mee met de pagina: kop omlaag als je naar beneden scrolt,
   kop omhoog als je terug naar boven scrolt, horizontaal als je stilstaat. */
.duiker {
  position: fixed; right: 10px; top: 0; z-index: 30;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  pointer-events: none;
  will-change: transform;
}
.duiker-svg {
  width: 74px; height: auto; overflow: visible;
  transition: transform .45s ease;
  filter: drop-shadow(0 2px 3px rgba(0,0,0,.25));
}
.duiker.omlaag .duiker-svg { transform: rotate(75deg); }
.duiker.omhoog .duiker-svg { transform: rotate(-75deg); }
.duiker .benen { transform-box: view-box; transform-origin: 52px 25px; animation: trappen 1.4s ease-in-out infinite alternate; }
.duiker.actief .benen { animation-duration: .35s; }
/* Aan het oppervlak dobbert de duiker op de golven */
.duiker.oppervlak .duiker-svg { animation: dobberen 2.4s ease-in-out infinite; }
@keyframes dobberen { 0%, 100% { translate: 0 0; rotate: -3deg; } 50% { translate: 0 4px; rotate: 3deg; } }
@keyframes trappen { from { transform: rotate(-7deg); } to { transform: rotate(7deg); } }
.duiker .diepte {
  background: var(--inkt); color: var(--boei); border: 2px solid var(--boei); border-radius: 6px;
  padding: 1px 8px; font-family: var(--koppen); font-weight: 800; font-size: .95rem;
  font-variant-numeric: tabular-nums;
}
.belletje {
  position: fixed; z-index: 29; pointer-events: none;
  border: 1.5px solid rgba(242, 247, 251, .8); border-radius: 50%;
  animation: belletje 2.2s ease-out forwards;
}
@keyframes belletje { to { transform: translate(var(--dx, 0), -90px) scale(1.3); opacity: 0; } }
@media (max-width: 600px) {
  .duiker-svg { width: 66px; }
  .duiker { right: 2px; }
  /* ruimte vrijhouden zodat de duiker de tekst niet bedekt */
  body:has(.duiker) main .wrap { padding-right: 64px; }
}

@media (prefers-reduced-motion: reduce) {
  .duiker .benen, .duiker.oppervlak .duiker-svg { animation: none; }
  .duiker-svg { transition: none; }
}

/* ---------- Dolfijnen en ster onderweg ----------
   De duiker komt ze tegen in zijn zwembaan rechts.
   De ster onderaan = het 1-sterbrevet. */
.met-dolfijnen, .oproep { position: relative; }
.dolfijnen {
  position: absolute; top: 0; bottom: 0; right: 110px; width: 90px;
  display: flex; flex-direction: column; justify-content: space-around; align-items: center;
  pointer-events: none;
}
.dolfijn { width: 84px; height: auto; animation: zwemmen 3.2s ease-in-out infinite; }
.dolfijn.zilver { animation-delay: -1.1s; margin-right: 30px; }
.dolfijn.goud { animation-delay: -2.2s; }
@keyframes zwemmen {
  0%, 100% { transform: translate(0, 0) rotate(-4deg); }
  50% { transform: translate(-8px, -6px) rotate(5deg); }
}
.ster {
  position: absolute; right: 110px; bottom: 40px; width: 72px; height: auto;
  opacity: .55; transition: opacity .6s, transform .6s, filter .6s;
}
.ster.gevonden {
  opacity: 1; transform: scale(1.25) rotate(18deg);
  filter: drop-shadow(0 0 14px rgba(242, 194, 48, .8));
}
@media (max-width: 1000px) { .dolfijnen { right: 60px; } .ster { right: 70px; } }
@media (max-width: 600px) {
  .dolfijnen { right: 0; width: 64px; }
  .dolfijn { width: 54px; }
  .dolfijn.zilver { margin-right: 0; }
  .ster { right: 14px; bottom: 28px; width: 50px; }
}
@media (prefers-reduced-motion: reduce) {
  .dolfijn { animation: none; }
  .ster { transition: none; }
}

/* ---------- Footer ---------- */
.site-footer { background: var(--abyss); color: #A3BDD6; padding: 0 0 80px; font-size: .95rem; }
.site-footer .wrap { border-top: 1px solid rgba(242, 247, 251, .15); padding-top: 36px; display: grid; gap: 24px; }
@media (min-width: 820px) { .site-footer .wrap { grid-template-columns: repeat(3, 1fr); } }
.site-footer h3 { color: var(--licht); font-size: 1rem; margin-bottom: .4em; }
.site-footer p { margin: 0; }
.site-footer a { color: var(--licht); }


/* ---------- Partners (footer) ---------- */
.site-footer .partners { list-style: none; display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin-top: 28px; padding-top: 24px; padding-bottom: 8px; border-top: 1px solid rgba(242, 247, 251, .2); }
.partners li { background: var(--licht); border-radius: 8px; padding: 8px 12px; display: flex; align-items: center; }
.partners li.donker { background: #09233A; box-shadow: inset 0 0 0 1px rgba(242, 247, 251, .35); }
.partners img { height: 48px; width: auto; display: block; }