/* Layout: night-sky page like the study guide and the video. Header (mascot + title + video button),
   level pills, then one paper card that shows a single question at a time with picture, answer, feedback. */
:root {
  --sky: #1b2547;
  --sky-2: #26335f;
  --star: #f2b33d;
  --star-soft: #f7d58c;
  --paper: #fbf8f1;
  --paper-2: #f1ecdf;
  --ink: #23263a;
  --ink-2: #555a75;
  --muted: #aab4d8;
  --good: #3f9c55;
  --good-soft: #dff2e3;
  --bad: #d4513d;
  --bad-soft: #fbe3de;
  --a: #4a7bd8;
  --a-soft: #dbe6fa;
  --b: #e08a2c;
  --b-soft: #fbe7cf;
  --display: "Fredoka", "Arial Rounded MT Bold", "Trebuchet MS", sans-serif;
  --body: "Nunito", "Avenir Next", "Segoe UI", sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background-color: var(--sky);
  background-image:
    radial-gradient(1.5px 1.5px at 12% 18%, #ffffffaa 50%, transparent 51%),
    radial-gradient(1px 1px at 33% 72%, #ffffff88 50%, transparent 51%),
    radial-gradient(2px 2px at 58% 12%, #ffffffaa 50%, transparent 51%),
    radial-gradient(1px 1px at 81% 44%, #ffffff77 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 92% 86%, #ffffff99 50%, transparent 51%);
  background-size: 420px 420px;
  color: var(--paper);
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.45;
  -webkit-tap-highlight-color: transparent;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 18px 16px 56px; display: grid; gap: 18px; }
header { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 12px; align-items: center; }
.mascot { width: 72px; height: 72px; transition: transform .3s; }
.mascot.jump { animation: jump .7s ease; }
@keyframes jump { 30% { transform: translateY(-16px) rotate(-8deg); } 60% { transform: translateY(0) rotate(6deg); } }
h1 { font-family: var(--display); font-size: clamp(1.4rem, 4.5vw, 2rem); margin: 0; line-height: 1.1; }
h1 mark { background: var(--star); color: var(--ink); padding: 0 .2em; border-radius: 6px; }
.sub { margin: 4px 0 0; color: var(--muted); font-size: .95rem; }

button {
  font: 600 1.05rem var(--display); border: none; border-radius: 999px; padding: 10px 20px; cursor: pointer;
  background: var(--sky); color: var(--paper); min-height: 46px;
}
button.alt { background: var(--paper-2); color: var(--ink); }
button.go { background: var(--good); color: #fff; }
button:disabled { opacity: .45; cursor: default; }
.video-btn { background: var(--star); color: var(--ink); white-space: nowrap; }

.video-box { display: none; background: #000; border-radius: 18px; overflow: hidden; }
.video-box.open { display: block; }
.video-box video { width: 100%; display: block; }
.head-btns { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
@media (max-width: 600px) {
  .head-btns { grid-column: 1 / -1; justify-content: stretch; }
  .head-btns button { flex: 1; }
}
.table-btn { background: var(--a-soft); color: var(--ink); white-space: nowrap; }
.back-btn { font: 600 1.05rem var(--display); background: var(--sky-2); color: var(--muted); text-decoration: none; border-radius: 999px; padding: 10px 18px; display: inline-grid; place-items: center; min-height: 46px; white-space: nowrap; }
@media (max-width: 600px) { .back-btn { flex: 1; } }

/* tabla pitagórica: tap a number to see its row and column */
.ptable-box { display: none; background: var(--paper); color: var(--ink); border-radius: 22px; padding: 16px; gap: 10px; justify-items: center; }
.ptable-box.open { display: grid; }
.ptable-box p { margin: 0; font-weight: 800; text-align: center; }
.ptable-box .readout { font: 600 clamp(1.1rem, 4.5vw, 1.6rem) var(--display); text-align: center; min-height: 1.4em; }
.ptable-box .readout b { color: var(--a); }
.ptable-box .readout i { color: var(--b); font-style: normal; }
.ptable-box .readout em { color: var(--good); font-style: normal; }
.ptable { border-collapse: separate; border-spacing: 2px; font-family: var(--display); font-weight: 600; font-size: clamp(.7rem, 2.6vw, 1rem); }
.ptable td { width: clamp(24px, 7.6vw, 40px); height: clamp(24px, 7.6vw, 36px); text-align: center; border-radius: 6px; cursor: pointer; background: #fff; }
.ptable tr:first-child td, .ptable td:first-child { background: var(--paper-2); color: var(--ink-2); }
.ptable td.row { background: var(--a-soft); }
.ptable td.col { background: var(--b-soft); }
.ptable td.rh { background: var(--a); color: #fff; }
.ptable td.ch { background: var(--b); color: #fff; }
.ptable td.hit { background: var(--good); color: #fff; }

.levels { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; }
.lvl {
  flex: none; background: var(--sky-2); color: var(--paper); border: 2px solid transparent;
  border-radius: 16px; padding: 8px 14px; text-align: left; min-height: 0; display: grid; gap: 2px;
}
.lvl small { font-family: var(--body); font-weight: 800; color: var(--muted); font-size: .75rem; }
.lvl .stars { color: var(--star); letter-spacing: 2px; font-size: .9rem; }
.lvl.on { border-color: var(--star); background: var(--paper); color: var(--ink); }
.lvl.on small { color: var(--ink-2); }

.card { background: var(--paper); color: var(--ink); border-radius: 22px; padding: 20px clamp(16px, 4vw, 30px) 24px; display: grid; gap: 16px; }
.card-top { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.card-top h2 { font-family: var(--display); margin: 0; font-size: 1.3rem; }
.dots { display: flex; gap: 6px; }
.dots span { width: 14px; height: 14px; border-radius: 50%; background: var(--paper-2); }
.dots span.now { background: var(--star); }
.dots span.ok { background: var(--good); }
.dots span.meh { background: var(--b); }

.prompt { font-size: 1.25rem; font-weight: 800; }
.prompt .big { font-family: var(--display); font-size: 1.7rem; font-weight: 600; }
.pic { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }

.bag { border: 3px solid #bab4a8; background: #ece8e0; border-radius: 50%; min-width: 92px; min-height: 92px; padding: 14px; display: flex; flex-wrap: wrap; gap: 2px; justify-content: center; align-content: center; max-width: 130px; font-size: 1.45rem; line-height: 1; }
.bag.box { border-radius: 10px; border-color: var(--b); background: var(--b-soft); }
.bag.bolsa { border-radius: 18px 18px 30px 30px; border-color: var(--a); background: var(--a-soft); }

.tray { display: inline-grid; gap: 4px; padding: 10px; background: #d8dde9; border: 4px solid #a0a8be; border-radius: 16px; font-size: 1.6rem; line-height: 1; }
.tray span { width: 1.6em; height: 1.6em; display: grid; place-items: center; border-radius: 8px; }
.tray span.new { background: var(--good-soft); }

.tree { display: grid; gap: 6px; font-weight: 800; }
.tree div { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.tree .r { background: var(--a-soft); color: var(--a); border-radius: 10px; padding: 3px 10px; }
.tree .l { background: var(--b-soft); color: #9a5a12; border-radius: 10px; padding: 3px 10px; }

.answer { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; justify-content: center; font-family: var(--display); font-size: 1.8rem; }
.answer input {
  width: 3.2ch; min-width: 76px; font: 600 1.8rem var(--display); text-align: center; color: var(--ink);
  border: 3px solid var(--paper-2); border-radius: 14px; padding: 6px; background: #fff;
}
.answer input:focus { outline: none; border-color: var(--a); }
.answer input.right { border-color: var(--good); background: var(--good-soft); }
.answer input.wrong { border-color: var(--bad); background: var(--bad-soft); }
.answer .lbl { font-family: var(--body); font-size: .85rem; color: var(--ink-2); display: block; text-align: center; font-weight: 800; }
.answer label { display: grid; gap: 2px; }

.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; }
.choice {
  background: #fff; color: var(--ink); border: 3px solid var(--paper-2); border-radius: 16px;
  font: 600 1.35rem var(--display); padding: 12px; min-height: 64px;
}
.choice:hover:not(:disabled) { border-color: var(--a); }
.choice.sel { border-color: var(--a); background: var(--a-soft); }
.choice.right { border-color: var(--good); background: var(--good-soft); }
.choice.wrong { border-color: var(--bad); background: var(--bad-soft); }
.choice.missed { border-color: var(--good); border-style: dashed; }
.note { text-align: center; color: var(--ink-2); font-weight: 800; font-size: .95rem; }

.feedback { border-radius: 14px; padding: 12px 16px; font-weight: 800; display: none; }
.feedback.show { display: block; }
.feedback.ok { background: var(--good-soft); color: var(--good); }
.feedback.no { background: var(--bad-soft); color: var(--bad); }
.feedback.info { background: var(--star-soft); color: var(--ink); }
.feedback .why { display: block; color: var(--ink); font-weight: 600; margin-top: 4px; }

.hint { display: none; background: var(--a-soft); border-radius: 14px; padding: 12px 16px; gap: 10px; }
.hint.show { display: grid; }
.hint p { margin: 0; font-weight: 800; color: var(--a); }

.actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: space-between; }
.actions .right-side { display: flex; gap: 10px; margin-left: auto; }

.done { text-align: center; display: grid; gap: 14px; justify-items: center; padding: 10px 0; }
.done .big-stars { font-size: 3rem; color: var(--star); letter-spacing: 6px; }
.done h2 { font-family: var(--display); margin: 0; font-size: 1.8rem; }

/* coins and bills */
.money { flex-direction: column; align-items: center; gap: 8px; }
.money-row { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; }
.coin, .bill { font-family: var(--display); font-weight: 600; display: inline-grid; place-items: center; color: var(--ink); }
.coin { width: 48px; height: 48px; border-radius: 50%; background: radial-gradient(circle at 35% 35%, #f5d08a, #c98b3a); font-size: .85rem; box-shadow: inset 0 0 0 3px #b07a2e55; }
.bill { height: 44px; padding: 0 14px; border-radius: 6px; font-size: 1rem; border: 2px solid #0002; }
.b100 { background: #c9b6e8; }
.b1000 { background: #f2c7a0; }