/* =========================================================
   De Digitale Wereld — gedeelde stijl
   Eén bestand voor de hele site. Kleuren en maten staan als
   CSS-variabelen bovenaan, zodat je alles op één plek aanpast.
   ========================================================= */

:root {
  --paper:      #FAFAFB;
  --paper-2:    #FFFFFF;
  --ink:        #14161D;
  --muted:      #5B6072;
  --line:       #E4E6EC;
  --accent:     #3B5BFF;
  --accent-ink: #1E2B7A;
  --accent-soft:#EAEEFF;
  --ok:         #1F9D6B;
  --ok-soft:    #E4F5EE;
  --bad:        #D6455B;
  --bad-soft:   #FBE7EA;
  --bit-on:     #14161D;
  --bit-off:    #E4E6EC;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --radius: 14px;
  --maxw: 920px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--paper-2);
  position: sticky; top: 0; z-index: 10;
}
header.site .bar {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 22px;
  display: flex; align-items: center; gap: 18px;
}
.brand {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: var(--ink);
}
.brand .bits { display: flex; gap: 3px; }
.brand .bits i {
  width: 9px; height: 16px; border-radius: 2px; display: block;
  background: var(--bit-off);
}
.brand .bits i.on { background: var(--bit-on); }
.brand b { font-family: var(--mono); font-weight: 600; letter-spacing: -.01em; }
header.site nav { margin-left: auto; display: flex; gap: 6px; }
header.site nav a {
  font-family: var(--mono); font-size: 14px; text-decoration: none;
  color: var(--muted); padding: 7px 12px; border-radius: 9px;
}
header.site nav a:hover { color: var(--ink); background: var(--paper); }
header.site nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

main { padding: 40px 0 80px; }

footer.site {
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 14px;
  padding: 26px 0; text-align: center; font-family: var(--mono);
}

/* ---------- Typografie ---------- */
.eyebrow {
  font-family: var(--mono); font-size: 13px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 10px;
}
h1 { font-size: 2.05rem; line-height: 1.15; margin: 0 0 14px; letter-spacing: -.02em; }
h2 { font-size: 1.4rem; margin: 38px 0 12px; letter-spacing: -.01em; }
h3 { font-size: 1.08rem; margin: 24px 0 8px; }
p  { margin: 0 0 14px; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 60ch; }
a { color: var(--accent-ink); }
code, kbd { font-family: var(--mono); font-size: .92em; background: var(--accent-soft); padding: 2px 6px; border-radius: 6px; }

/* ---------- Kaarten / catalogus ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin-top: 8px; }
.card {
  display: block; text-decoration: none; color: inherit;
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px;
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 8px 24px rgba(20,22,29,.06); }
.card .tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: .06em;
  color: var(--accent-ink); background: var(--accent-soft);
  padding: 3px 8px; border-radius: 999px; display: inline-block; margin-bottom: 10px;
}
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }

/* ---------- Interactieve panelen (voor onderwerp-pagina's) ---------- */
.lab {
  background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; margin: 18px 0;
}
.lab h3 { margin-top: 0; }
.readout {
  font-family: var(--mono); font-size: 1.1rem;
  background: var(--ink); color: #F4F6FF;
  padding: 12px 14px; border-radius: 10px; overflow-x: auto;
}
.row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
label.field { display: block; font-family: var(--mono); font-size: 13px; color: var(--muted); margin-bottom: 4px; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
button.btn {
  font-family: var(--mono); font-size: 14px; cursor: pointer;
  background: var(--accent); color: #fff; border: 0;
  padding: 10px 16px; border-radius: 10px;
}
button.btn:hover { filter: brightness(1.05); }
button.btn.ghost { background: var(--paper); color: var(--ink); border: 1px solid var(--line); }

/* bit-toggles */
.bits-row { display: flex; gap: 8px; flex-wrap: wrap; }
.bit {
  width: 54px; height: 64px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--paper); cursor: pointer; font-family: var(--mono);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 1.3rem; transition: background .1s, color .1s;
}
.bit small { font-size: 11px; color: var(--muted); margin-top: 4px; }
.bit.on { background: var(--ink); color: #fff; }
.bit.on small { color: #aab; }

/* ---------- Toets ---------- */
.quiz-q { background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; margin-bottom: 16px; }
.quiz-q .qnum { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.opt {
  display: block; width: 100%; text-align: left; cursor: pointer;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink);
  padding: 12px 14px; border-radius: 10px; margin-top: 8px; font-size: 1rem;
  font-family: var(--sans);
}
.opt:hover { border-color: var(--accent); }
.opt.chosen { border-color: var(--accent); background: var(--accent-soft); }
.opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.feedback { margin-top: 10px; font-size: .95rem; padding: 10px 12px; border-radius: 8px; }
.feedback.ok { background: var(--ok-soft); color: #145c41; }
.feedback.bad { background: var(--bad-soft); color: #8a2230; }
.scorebox {
  text-align: center; background: var(--paper-2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 34px; margin-bottom: 20px;
}
.scorebox .big { font-family: var(--mono); font-size: 3rem; letter-spacing: -.02em; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* ---------- Onderwerp-ritmiek: hook, denk-na, noteer ---------- */
.hook {
  background: var(--ink); color: #F4F6FF;
  border-radius: var(--radius); padding: 26px 24px; margin: 4px 0 18px;
}
.hook p { margin: 0; font-size: 1.25rem; line-height: 1.45; }
.hook .label {
  font-family: var(--mono); font-size: 12px; letter-spacing: .1em;
  text-transform: uppercase; color: #8FA0FF; display: block; margin-bottom: 8px;
}
details.denk {
  border: 1px solid var(--line); border-radius: 10px; padding: 0 16px; margin: 0 0 22px;
  background: var(--paper-2);
}
details.denk summary {
  cursor: pointer; font-family: var(--mono); font-size: 14px; color: var(--accent-ink);
  padding: 12px 0; list-style: none;
}
details.denk summary::-webkit-details-marker { display: none; }
details.denk summary::before { content: "▸ "; }
details.denk[open] summary::before { content: "▾ "; }
details.denk .body { padding: 0 0 14px; color: var(--muted); }

.noteer {
  border: 1px solid var(--accent); background: var(--accent-soft);
  border-radius: var(--radius); padding: 22px 24px; margin: 28px 0;
}
.noteer h3 { margin-top: 0; color: var(--accent-ink); }
.noteer .hint { font-size: .9rem; color: var(--muted); margin-bottom: 12px; }
.noteer ol { margin: 0; padding-left: 22px; }
.noteer li { margin: 7px 0; }

/* stap-nummer op de kaarten */
.card .stap {
  font-family: var(--mono); font-size: 12px; color: var(--muted);
  display: inline-block; margin-bottom: 8px;
}

/* ---------- VWO-verdieping ---------- */
:root { --vwo: #7A3CC4; --vwo-soft: #F1E9FB; --vwo-ink: #4A1E80; }
.vwo {
  border: 1px solid var(--vwo); background: var(--vwo-soft);
  border-radius: var(--radius); padding: 20px 22px; margin: 26px 0;
}
.vwo h3 { margin-top: 0; color: var(--vwo-ink); display: flex; align-items: center; gap: 10px; }
.vwo .badge {
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em;
  background: var(--vwo); color: #fff; padding: 3px 9px; border-radius: 999px;
}
.vwo code { background: #fff; }

/* ---------- Echt voorbeeld ---------- */
.voorbeeld {
  border-left: 3px solid var(--accent); background: var(--paper-2);
  padding: 12px 16px; margin: 18px 0; border-radius: 0 10px 10px 0;
}
.voorbeeld .label {
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 4px;
}
.voorbeeld p { margin: 0; }

/* ---------- Niveau-keuze + vwo-merk in de toets ---------- */
.niveau { display: flex; gap: 8px; margin: 18px 0 26px; flex-wrap: wrap; }
.qtag-vwo {
  font-family: var(--mono); font-size: 10px; letter-spacing: .08em;
  background: var(--vwo); color: #fff; padding: 2px 7px; border-radius: 999px; margin-left: 8px;
}

/* ===================== Tentamen & admin ===================== */
.tnt-veld { margin-bottom: 14px; }
.tnt-veld label { display:block; font-family:var(--mono); font-size:13px; color:var(--muted); margin-bottom:5px; }
.tnt-veld input[type="text"], .tnt-veld input[type="password"], .tnt-veld input[type="number"], .tnt-veld select, .open-invul {
  width:100%; font-size:1rem; padding:10px 12px; border:1px solid var(--line);
  border-radius:10px; font-family:var(--sans); background:var(--paper-2);
}
.open-invul { font-family:var(--mono); }
.tnt-card { background:var(--paper-2); border:1px solid var(--line); border-radius:var(--radius); padding:22px; margin:16px 0; }
.tnt-melding { padding:14px 16px; border-radius:10px; margin:12px 0; font-size:.97rem; }
.tnt-melding.fout { background:var(--bad-soft); color:#8a2230; }
.tnt-melding.ok { background:var(--ok-soft); color:#145c41; }

/* modal */
.overlay { position:fixed; inset:0; background:rgba(20,22,29,.55); display:flex; align-items:center; justify-content:center; padding:20px; z-index:50; }
.modal { background:var(--paper-2); border-radius:16px; padding:28px; max-width:440px; width:100%; box-shadow:0 20px 60px rgba(0,0,0,.25); }
.modal h3 { margin-top:0; }
.modal .row { justify-content:flex-end; margin-top:20px; }

/* voortgang */
.voortgang { font-family:var(--mono); font-size:13px; color:var(--muted); }
.q-open .open-invul { max-width:340px; }

/* admin tabel */
.tabs { display:flex; gap:6px; border-bottom:1px solid var(--line); margin:18px 0 22px; flex-wrap:wrap; }
.tabs button { font-family:var(--mono); font-size:14px; background:none; border:0; padding:10px 14px; cursor:pointer; color:var(--muted); border-bottom:2px solid transparent; }
.tabs button.actief { color:var(--accent); border-bottom-color:var(--accent); }
table.tbl { width:100%; border-collapse:collapse; font-size:.95rem; }
table.tbl th { text-align:left; font-family:var(--mono); font-size:12px; color:var(--muted); padding:8px 10px; border-bottom:1px solid var(--line); }
table.tbl td { padding:9px 10px; border-bottom:1px solid var(--line); }
table.tbl tr.klikbaar { cursor:pointer; }
table.tbl tr.klikbaar:hover { background:var(--accent-soft); }
.pill { font-family:var(--mono); font-size:11px; padding:2px 9px; border-radius:999px; display:inline-block; }
.pill.bezig { background:#FFF3D6; color:#8a6300; }
.pill.ingeleverd { background:var(--ok-soft); color:#145c41; }
.pill.let-op { background:var(--bad-soft); color:#8a2230; }

/* nakijk-detail */
.nk-vraag { border:1px solid var(--line); border-radius:12px; padding:16px 18px; margin:12px 0; }
.nk-vraag.goed { border-left:4px solid var(--ok); }
.nk-vraag.fout { border-left:4px solid var(--bad); }
.nk-vraag.beoordelen { border-left:4px solid #E0A100; background:#FFFBF0; }
.nk-ant { font-family:var(--mono); font-size:.95rem; margin:6px 0; }
.nk-knoppen { display:flex; gap:8px; margin-top:10px; }
.nk-knoppen button { font-family:var(--mono); font-size:13px; padding:6px 12px; border-radius:8px; border:1px solid var(--line); background:var(--paper); cursor:pointer; }
.nk-knoppen button.kies-goed.aan { background:var(--ok); color:#fff; border-color:var(--ok); }
.nk-knoppen button.kies-fout.aan { background:var(--bad); color:#fff; border-color:var(--bad); }

@media print {
  header.site, footer.site, .tabs, .nk-knoppen, .geen-print { display:none !important; }
}

/* =========================================================
   Toevoegingen: experiment-blok, mini-spellen, highscores
   ========================================================= */

/* ---------- Experiment-blok (eigen kleur: amber) ---------- */
:root { --exp: #E08A1E; --exp-soft: #FFF4E2; --exp-ink: #8A5208; }
.experiment {
  border: 1px solid var(--exp); background: var(--exp-soft);
  border-radius: var(--radius); padding: 20px 22px; margin: 26px 0;
}
.experiment h3 { margin-top: 0; color: var(--exp-ink); display: flex; align-items: center; gap: 10px; }
.experiment .badge {
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase;
  background: var(--exp); color: #fff; padding: 3px 9px; border-radius: 999px;
}
.experiment .uitzoeken {
  font-family: var(--mono); font-size: 11px; letter-spacing: .04em; color: var(--exp-ink);
  background: #fff; border: 1px dashed var(--exp); padding: 2px 8px; border-radius: 999px;
  display: inline-block; margin: 2px 0 6px;
}
.experiment ol, .experiment ul { margin: 8px 0; padding-left: 22px; }
.experiment li { margin: 6px 0; }
.experiment code { background: #fff; }

/* ---------- Mini-spel (arcade) ---------- */
.spel { background: var(--paper-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; margin: 18px 0; }
.spel h3 { margin-top: 0; }
.spel-balk { display: flex; gap: 18px; align-items: center; font-family: var(--mono); margin-bottom: 14px; flex-wrap: wrap; }
.spel-balk .tijd { font-size: 1.4rem; font-weight: 700; min-width: 70px; }
.spel-balk .score { font-size: 1.1rem; color: var(--accent-ink); }
.spel-vraag { font-family: var(--mono); font-size: 2rem; text-align: center; padding: 14px 0; letter-spacing: .02em; }
.spel-opties { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.spel-opties button {
  flex: 1 1 120px; min-height: 62px; font-family: var(--mono); font-size: 1.2rem; cursor: pointer;
  border: 1px solid var(--line); background: var(--paper); border-radius: 12px; padding: 12px; color: var(--ink);
}
.spel-opties button:hover { border-color: var(--accent); }
.spel-opties button:disabled { cursor: default; }
.spel.goed { animation: flitsGoed .3s; }
.spel.fout { animation: flitsFout .3s; }
@keyframes flitsGoed { 0% { background: var(--ok-soft); } 100% { background: var(--paper-2); } }
@keyframes flitsFout { 0% { background: var(--bad-soft); } 100% { background: var(--paper-2); } }
.kleur-knop { min-height: 84px; border-radius: 12px; border: 2px solid var(--line); cursor: pointer; flex: 1 1 110px; }
.kleur-knop:hover { border-color: var(--ink); }

/* ---------- Highscore-tabel ---------- */
.highscore { width: 100%; border-collapse: collapse; margin-top: 14px; font-family: var(--mono); font-size: 14px; }
.highscore caption { text-align: left; color: var(--muted); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 6px; }
.highscore th, .highscore td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); }
.highscore td.plek { color: var(--muted); width: 30px; }
.highscore td.sc { text-align: right; font-weight: 700; }
.highscore tr.nieuw td { background: var(--ok-soft); }
.naam-invoer { display: flex; gap: 10px; align-items: center; margin-top: 12px; flex-wrap: wrap; }
.naam-invoer input { font-family: var(--mono); font-size: 1rem; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; }

/* ---------- Kleurmeng-demo (additief / subtractief) ---------- */
.meng { display: flex; gap: 22px; flex-wrap: wrap; }
.meng .kolom { flex: 1 1 240px; }
.meng .staal { height: 90px; border-radius: 12px; border: 1px solid var(--line); margin-top: 10px; }
.meng .cirkels { position: relative; height: 160px; }
.cirkels span { position: absolute; width: 92px; height: 92px; border-radius: 50%; }
.cirkels.add span { mix-blend-mode: screen; }
.cirkels.sub span { mix-blend-mode: multiply; }

/* ---------- Bin/dec/hex-converter (nibbles) ---------- */
.nibbles { display: flex; gap: 26px; flex-wrap: wrap; }
.nibble { flex: 1 1 200px; }
.nibble .bits4 { display: flex; gap: 6px; margin-top: 8px; }
.nibble .b4 { flex: 1; text-align: center; font-family: var(--mono); border: 1px solid var(--line); border-radius: 8px; padding: 8px 0; background: var(--paper); }
.nibble .b4.on { background: var(--ink); color: #fff; }
.conv-uit { font-family: var(--mono); font-size: 1.15rem; margin-top: 16px; }
.conv-uit b { font-size: 1.4rem; }

/* ---------- Stapsgewijze weergave ("Verder"-knop) ---------- */
.verder-balk { margin: 30px 0 8px; text-align: center; }
.verder-knop { min-width: 220px; font-size: 1rem; }
.verder-teller { font-family: var(--mono); font-size: 12px; color: var(--muted); margin: 10px 0 0; letter-spacing: .04em; }

/* ---------- Port-forwarding-diagram (stap 9) ---------- */
.pf { margin-top: 12px; }
.pf-rij { display: flex; align-items: stretch; gap: 10px; flex-wrap: wrap; justify-content: center; }
.pf-node { border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; background: var(--paper); text-align: center; min-width: 120px; display: flex; flex-direction: column; justify-content: center; transition: box-shadow .15s, border-color .15s; }
.pf-node b { font-size: .95rem; }
.pf-node small { display: block; font-family: var(--mono); font-size: 11px; color: var(--muted); margin-top: 3px; }
.pf-router { border-color: var(--accent); background: var(--accent-soft); min-width: 240px; }
.pf-regel { margin-top: 8px; font-family: var(--mono); font-size: 13px; display: flex; gap: 6px; align-items: center; justify-content: center; flex-wrap: wrap; }
.pf-regel select { font-family: var(--mono); font-size: 12px; padding: 4px 6px; border: 1px solid var(--line); border-radius: 8px; background: var(--paper); color: var(--ink); }
.pf-pijl { display: flex; align-items: center; justify-content: center; font-size: 24px; color: var(--line-2, #c2c9d6); min-width: 24px; }
.pf-down { width: 100%; height: 26px; }
.pf-thuis { margin-top: 6px; }
.pf-node.actief { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.pf-pijl.actief { color: var(--accent); }
.pf-node.goed { border-color: var(--ok); box-shadow: 0 0 0 3px var(--ok-soft); }
.pf-node.fout { border-color: var(--bad); box-shadow: 0 0 0 3px var(--bad-soft); }
.pf-pijl.goed { color: var(--ok); }
.pf-pijl.fout { color: var(--bad); }

/* ---------- Mini neuraal netwerk (stap 14) ---------- */
.nn-net { display: block; margin: 6px auto; }
.nn-drempels { display: flex; flex-direction: column; gap: 12px; margin: 16px 0; }
.nn-drempels label { font-family: var(--mono); font-size: 13px; display: block; }
.nn-drempels input[type=range] { margin-top: 4px; }
.nn-tt table { border-collapse: collapse; font-family: var(--mono); font-size: 13px; margin-top: 4px; }
.nn-tt td, .nn-tt th { border: 1px solid var(--line); padding: 5px 12px; text-align: center; }
.nn-tt th { color: var(--muted); font-weight: 600; }