/* Gedeelde basis voor de rekenspellen van Mijn Leerplein (levels, sterren, tijd, hartjes). */
:root {
  --bg1: #fff7ed;
  --bg2: #ffedd5;
  --ink: #1f2937;
  --muted: #6b7280;
  --card: #ffffff;
  --line: #e5e7eb;
  --accent: #f97316;
  --accent2: #ea580c;
  --soft: #ffedd5;
  --good: #16a34a;
  --good-soft: #dcfce7;
  --bad: #dc2626;
  --bad-soft: #fee2e2;
  --gold: #facc15;
  --radius: 18px;
  --shadow: 0 6px 18px rgba(0, 0, 0, .08);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background: linear-gradient(180deg, var(--bg1), var(--bg2)) fixed;
  color: var(--ink);
  font-family: "Nunito", "Segoe UI Rounded", "SF Pro Rounded", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 18px; line-height: 1.35;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
.hidden { display: none !important; }

/* ---------- kopbalk ---------- */
.k-top {
  display: flex; align-items: center; gap: 10px; padding: 10px 16px;
  background: rgba(255, 255, 255, .85); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20; backdrop-filter: blur(6px);
}
.k-logo { font-weight: 900; font-size: 22px; white-space: nowrap; display: flex; align-items: center; gap: 8px; }
.k-logo small { display: block; font-size: 12px; font-weight: 700; color: var(--muted); }
.k-top-actions { margin-left: auto; display: flex; gap: 8px; }
.k-top-btn {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 7px 12px; font-weight: 800; font-size: 16px; box-shadow: var(--shadow);
}
.k-top-btn:hover { border-color: var(--accent); }

main.k-main { max-width: 980px; margin: 0 auto; padding: 18px 16px 40px; }

/* ---------- levelscherm ---------- */
.k-intro { text-align: center; margin: 6px 0 18px; }
.k-intro h1 { margin: 0 0 6px; font-size: 30px; }
.k-intro p { margin: 0 auto; max-width: 640px; color: var(--muted); }
.k-levels { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }
.k-level {
  position: relative; text-align: left; background: var(--card); border: 2px solid var(--line);
  border-radius: var(--radius); padding: 14px 14px 12px; box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 4px; min-height: 150px; transition: transform .12s;
}
.k-level:hover:not(.locked) { transform: translateY(-3px); border-color: var(--accent); }
.k-level .nr {
  width: 34px; height: 34px; border-radius: 50%; background: var(--accent); color: #fff;
  display: grid; place-items: center; font-weight: 900;
}
.k-level h3 { margin: 4px 0 0; font-size: 18px; }
.k-level .info { font-size: 14px; color: var(--muted); flex: 1; }
.k-level .groep { position: absolute; top: 14px; right: 14px; font-size: 12px; font-weight: 800; color: var(--accent2); background: var(--soft); padding: 3px 8px; border-radius: 99px; }
.k-level .stars { font-size: 20px; letter-spacing: 2px; }
.k-level.locked { opacity: .55; cursor: not-allowed; }
.k-level.locked .nr { background: #9ca3af; }
.k-level.volgende { border-color: var(--accent); box-shadow: 0 0 0 4px var(--soft), var(--shadow); }
.k-opties { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 18px 0 0; }
.k-toggle {
  background: var(--card); border: 2px solid var(--line); border-radius: 99px; padding: 8px 16px;
  font-weight: 800; font-size: 16px;
}
.k-toggle.on { border-color: var(--accent); background: var(--soft); }
.k-small { text-align: center; font-size: 13px; color: var(--muted); margin-top: 14px; }
.k-small button { text-decoration: underline; color: var(--muted); font-size: 13px; }

/* ---------- startkaart ---------- */
.k-card { background: var(--card); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); border: 1px solid var(--line); }
.k-startcard { max-width: 620px; margin: 10px auto; text-align: center; }
.k-startcard h2 { margin: 0 0 8px; font-size: 26px; }
.k-startcard .uitleg { text-align: left; margin: 12px 0 18px; }
.k-startcard .uitleg p { margin: 0 0 8px; }
.k-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #fff; border-radius: 14px; padding: 12px 22px;
  font-weight: 900; font-size: 20px; box-shadow: 0 4px 0 var(--accent2);
}
.k-btn:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--accent2); }
.k-btn.ghost { background: var(--card); color: var(--ink); border: 2px solid var(--line); box-shadow: none; }
.k-btn:disabled { opacity: .5; cursor: default; }
.k-btnrow { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }

/* ---------- spel ---------- */
.k-hud { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.k-hud .lvl { font-weight: 900; }
.k-hud .hearts { font-size: 22px; letter-spacing: 2px; }
.k-hud .score { margin-left: auto; font-weight: 900; background: var(--card); border-radius: 99px; padding: 4px 14px; box-shadow: var(--shadow); }
.k-progress { height: 12px; background: rgba(0, 0, 0, .08); border-radius: 99px; overflow: hidden; margin-bottom: 8px; }
.k-progress i { display: block; height: 100%; width: 0; background: var(--good); border-radius: 99px; transition: width .3s; }
.k-timer { height: 8px; background: rgba(0, 0, 0, .06); border-radius: 99px; overflow: hidden; margin-bottom: 14px; }
.k-timer i { display: block; height: 100%; width: 100%; background: var(--accent); border-radius: 99px; }
.k-timer.laag i { background: var(--bad); }
.k-stage { position: relative; min-height: 300px; }
.k-vraag { font-size: 26px; font-weight: 900; text-align: center; margin: 4px 0 14px; }
.k-vraag small { display: block; font-size: 16px; font-weight: 700; color: var(--muted); }

/* feedback */
.k-flash {
  position: fixed; left: 50%; top: 38%; transform: translate(-50%, -50%) scale(.6); z-index: 40;
  font-size: 34px; font-weight: 900; color: #fff; background: var(--good); padding: 14px 26px;
  border-radius: 20px; opacity: 0; pointer-events: none; white-space: nowrap; transition: all .25s; box-shadow: var(--shadow);
}
.k-flash.show { opacity: 1; transform: translate(-50%, -50%) scale(1); }
.k-tip {
  margin: 16px auto 0; max-width: 680px; background: var(--bad-soft); border: 2px solid var(--bad);
  border-radius: var(--radius); padding: 16px 18px; animation: pop .25s;
}
.k-tip h3 { margin: 0 0 6px; color: var(--bad); }
.k-tip .k-btn { margin-top: 12px; }
.k-tip .stap { background: #fff; border-radius: 10px; padding: 6px 10px; margin: 6px 0; font-weight: 800; }
@keyframes pop { from { transform: scale(.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }
@keyframes shake { 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
.shake { animation: shake .3s; }

/* einde */
.k-end { max-width: 560px; margin: 10px auto; text-align: center; }
.k-end .big { font-size: 64px; letter-spacing: 6px; margin: 6px 0; }
.k-end h2 { margin: 0; font-size: 28px; }
.k-end p { color: var(--muted); }
.k-end .oefen { text-align: left; background: var(--soft); border-radius: 14px; padding: 10px 14px; margin: 12px 0; font-size: 16px; }

/* invoer: getallenblok */
.k-pad { max-width: 360px; margin: 0 auto; }
.k-display {
  background: var(--card); border: 3px solid var(--accent); border-radius: 14px; min-height: 58px;
  font-size: 32px; font-weight: 900; text-align: center; padding: 6px; margin-bottom: 10px; letter-spacing: 1px;
}
.k-display .unit { font-size: 22px; color: var(--muted); margin-left: 6px; }
.k-display.leeg::before { content: "?"; color: #cbd5e1; }
.k-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
.k-keys button {
  background: var(--card); border: 2px solid var(--line); border-radius: 12px; padding: 10px 0;
  font-size: 24px; font-weight: 900; box-shadow: 0 3px 0 var(--line);
}
.k-keys button:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--line); }
.k-keys .ok { background: var(--good); color: #fff; border-color: var(--good); box-shadow: 0 3px 0 #15803d; grid-row: span 2; }
.k-keys .del { background: var(--soft); }

/* invoer: meerkeuze */
.k-mc { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; max-width: 640px; margin: 0 auto; }
.k-mc button {
  background: var(--card); border: 3px solid var(--line); border-radius: 16px; padding: 14px 8px;
  font-size: 26px; font-weight: 900; box-shadow: 0 4px 0 var(--line);
}
.k-mc button:hover { border-color: var(--accent); }
.k-mc button.goed { background: var(--good-soft); border-color: var(--good); }
.k-mc button.fout { background: var(--bad-soft); border-color: var(--bad); }

.k-confetti { position: fixed; inset: 0; pointer-events: none; z-index: 50; overflow: hidden; }
.k-confetti i { position: absolute; top: -20px; width: 10px; height: 14px; border-radius: 3px; animation: fall 2.4s linear forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(720deg); } }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .k-logo { font-size: 18px; }
  .k-top-btn .bt { display: none; }
  .k-intro h1 { font-size: 24px; }
  .k-vraag { font-size: 22px; }
  .k-levels { grid-template-columns: 1fr 1fr; gap: 10px; }
  .k-level { min-height: 130px; padding: 10px; }
  .k-level .info { font-size: 13px; }
  .k-level .groep { position: static; align-self: flex-start; }
  main.k-main { padding: 12px 10px 30px; }
}
@media print { .k-top { display: none; } }