/* EDU10 — утас/таблет тэргүүлсэн дизайн систем. Хүүхдэд: том үсэг, том товч (≥48px), тод өнгө. */
:root {
  --bg: #fffaf2; --card: #ffffff; --ink: #1f2430; --muted: #66707f; --line: #e8e1d3;
  --brand: #ff7a00; --brand-ink: #1f2430; --brand-soft: #fff0e0;
  --ok: #15803d; --ok-ink: #ffffff; --ok-soft: #e3f7ea; --bad: #d6403a; --bad-soft: #fde8e7; --info: #2b6fd6; --info-soft: #e6efff;
  --radius: 16px; --shadow: 0 2px 10px rgba(30, 20, 0, .08);
  --dur: 550ms;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171d; --card: #1e232c; --ink: #f2f4f7; --muted: #a2abb8; --line: #2e3542;
    --brand: #ff8c1a; --brand-ink: #14171d; --brand-soft: #3a2a14; --ok: #3ccf74; --ok-ink: #14171d; --ok-soft: #173a25; --bad: #ff6b64; --bad-soft: #40201f; --info: #6aa0ff; --info-soft: #1d2b45;
    --shadow: 0 2px 10px rgba(0, 0, 0, .4);
  }
}
:root[data-theme="dark"] {
  --bg: #14171d; --card: #1e232c; --ink: #f2f4f7; --muted: #a2abb8; --line: #2e3542;
  --brand: #ff8c1a; --brand-ink: #14171d; --brand-soft: #3a2a14; --ok: #3ccf74; --ok-ink: #14171d; --ok-soft: #173a25; --bad: #ff6b64; --bad-soft: #40201f; --info: #6aa0ff; --info-soft: #1d2b45;
  --shadow: 0 2px 10px rgba(0, 0, 0, .4);
}
@media (prefers-reduced-motion: reduce) { :root { --dur: 150ms; } }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 18px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Arial, sans-serif; min-height: 100dvh; }
a { color: var(--info); }
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.topbar { display: flex; align-items: center; gap: 12px; padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.topbar .brand { font-weight: 800; color: var(--brand); text-decoration: none; font-size: 20px; }
.topbar .spacer { flex: 1; }
.topbar .who { color: var(--muted); font-size: 15px; }
.wrap { max-width: 860px; margin: 0 auto; padding: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; margin-bottom: 14px; }
h1 { font-size: 26px; margin: 8px 0 12px; } h2 { font-size: 21px; margin: 6px 0 10px; } h3 { font-size: 18px; margin: 6px 0 8px; }
p { margin: 6px 0; } .muted { color: var(--muted); } .small { font-size: 15px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 10px 18px; border-radius: 14px; border: 2px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; text-decoration: none; font-weight: 600; touch-action: manipulation; }
.btn:active { transform: scale(.98); }
.btn.primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn.ok { background: var(--ok); border-color: var(--ok); color: var(--ok-ink); }
.btn.info { background: var(--info-soft); border-color: var(--info); color: var(--ink); }
.btn.big { font-size: 22px; min-height: 64px; padding: 14px 24px; width: 100%; }
.btn:disabled { opacity: .5; cursor: default; }
.btn:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid var(--info); outline-offset: 2px; }

label.field { display: block; margin: 8px 0; font-weight: 600; font-size: 16px; }
label.field > input, label.field > select, label.field > textarea { display: block; width: 100%; margin-top: 4px; min-height: 48px; padding: 10px 12px; border-radius: 12px; border: 2px solid var(--line); background: var(--bg); font-weight: 400; }
label.field > textarea { min-height: 90px; }
.pill { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 14px; font-weight: 700; background: var(--brand-soft); color: var(--ink); }
.pill.ok { background: var(--ok-soft); } .pill.bad { background: var(--bad-soft); } .pill.info { background: var(--info-soft); }
.list { list-style: none; margin: 0; padding: 0; }
.list li { display: flex; align-items: center; gap: 10px; padding: 12px 8px; border-bottom: 1px solid var(--line); }
.list li:last-child { border-bottom: 0; }
.list li .grow { flex: 1; min-width: 0; }
.list li.tap { cursor: pointer; } .list li.tap:hover { background: var(--brand-soft); }
.list select { min-height: 44px; padding: 6px 10px; border-radius: 10px; border: 2px solid var(--line); background: var(--bg); }
#cd-students li { flex-wrap: wrap; } #cd-students li .grow { flex: 1 1 100%; }
#class-form label.field { flex: 1 1 140px; }
@media (max-width: 480px) { .topbar .who.long { display: none; } }
.toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 12px; z-index: 50; max-width: 90vw; }
.alert { padding: 10px 14px; border-radius: 12px; background: var(--bad-soft); border: 1px solid var(--bad); margin: 8px 0; }
.alert.ok { background: var(--ok-soft); border-color: var(--ok); }
.alert.info { background: var(--info-soft); border-color: var(--info); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 15px; }
table.tbl th, table.tbl td { border-bottom: 1px solid var(--line); padding: 8px 6px; text-align: left; }
.tbl-wrap { overflow-x: auto; }

/* --- Сурагчийн бодлогын дэлгэц --- */
.problem-text { font-size: 22px; font-weight: 600; line-height: 1.4; margin-bottom: 10px; }
.keypad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-width: 320px; margin: 10px auto; }
.keypad .btn { font-size: 26px; min-height: 60px; }
.answer-box { font-size: 40px; font-weight: 800; text-align: center; min-height: 64px; border: 3px dashed var(--line); border-radius: 16px; letter-spacing: 4px; display: flex; align-items: center; justify-content: center; }
.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
.choices .btn { min-height: 72px; font-size: 20px; flex-direction: column; }
.choices .btn .emoji { font-size: 34px; }
.choices .btn.selected { border-color: var(--brand); background: var(--brand-soft); }
.pin-dots { display: flex; gap: 12px; justify-content: center; margin: 12px 0; }
.pin-dots span { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--muted); }
.pin-dots span.on { background: var(--brand); border-color: var(--brand); }
.students-pick { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
.progress { height: 10px; background: var(--line); border-radius: 6px; overflow: hidden; }
.progress > i { display: block; height: 100%; background: var(--ok); }

/* --- Анимацийн тайз (anim.js) --- */
.stage { position: relative; background: var(--bg); border: 2px solid var(--line); border-radius: var(--radius); padding: 10px; min-height: 200px; overflow: hidden; }
.stage .caption { min-height: 30px; font-weight: 600; font-size: 18px; margin-bottom: 8px; transition: opacity .2s; }
.stage .areas { display: flex; gap: 10px; flex-wrap: wrap; }
.stage .area { flex: 1 1 120px; min-height: 120px; border: 2px dashed var(--line); border-radius: 12px; padding: 6px; background: var(--card); }
.stage .area .alabel { font-size: 14px; color: var(--muted); font-weight: 700; margin-bottom: 4px; min-height: 18px; }
.stage .area .objs { display: grid; grid-template-columns: repeat(var(--cols, 5), 1fr); gap: 4px; }
.stage .obj { position: relative; display: flex; align-items: center; justify-content: center; font-size: 34px; width: 100%; aspect-ratio: 1; border-radius: 10px; will-change: transform; user-select: none; }
.stage .obj.hl { background: var(--ok-soft); box-shadow: inset 0 0 0 3px var(--ok); }
.stage .obj.extra { background: var(--bad-soft); box-shadow: inset 0 0 0 3px var(--bad); animation: shake var(--dur) ease; }
.stage .obj.ghost { opacity: .35; filter: grayscale(1); border: 2px dashed var(--bad); font-size: 26px; }
.stage .obj .num { position: absolute; top: -6px; right: -4px; min-width: 24px; height: 24px; padding: 0 6px; border-radius: 12px; background: var(--ok); color: var(--ok-ink); font-size: 14px; font-weight: 800; display: flex; align-items: center; justify-content: center; animation: pop var(--dur) ease; }
.stage .obj.extra .num { background: var(--bad); color: #fff; }
.stage .obj .pairno { position: absolute; bottom: -4px; left: -2px; font-size: 12px; font-weight: 800; background: var(--info); color: #fff; border-radius: 8px; padding: 0 5px; }
@media (max-width: 480px) { .stage .area { flex-basis: calc(50% - 5px); } .stage .obj { font-size: 28px; } }
.stage .counter { font-size: 44px; font-weight: 900; text-align: center; color: var(--ok); min-height: 54px; }
.stage .counter.bad { color: var(--bad); }
.stage .result { margin-top: 10px; padding: 10px 14px; border-radius: 12px; font-weight: 700; font-size: 19px; animation: pop var(--dur) ease; }
.stage .result.ok { background: var(--ok-soft); border: 2px solid var(--ok); }
.stage .result.bad { background: var(--bad-soft); border: 2px solid var(--bad); }
.stage .steps { margin: 6px 0 0; padding-left: 26px; font-size: 19px; font-weight: 600; }
.stage .steps li { margin: 6px 0; padding: 6px 10px; border-radius: 10px; background: var(--card); border: 1px solid var(--line); }
.stage .steps li:last-child { background: var(--info-soft); border-color: var(--info); }
/* бар модель */
.stage .bars { margin: 12px 0; }
.stage .bar-whole, .stage .bar-parts { display: flex; height: 44px; border-radius: 8px; overflow: hidden; margin: 6px 0; }
.stage .bar-whole > div { flex: 1; background: var(--info-soft); border: 2px solid var(--info); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-weight: 800; }
.stage .bar-parts > div { border: 2px solid var(--ink); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 15px; transition: flex var(--dur) ease; background: var(--ok-soft); overflow: hidden; white-space: nowrap; }
.stage .bar-parts > div.unknown { background: repeating-linear-gradient(45deg, var(--card), var(--card) 6px, var(--line) 6px, var(--line) 12px); }
.stage .bar-parts > div.wrong { background: var(--bad-soft); border-color: var(--bad); }
/* үг */
.stage .word { display: flex; gap: 6px; justify-content: center; margin: 12px 0; flex-wrap: wrap; }
.stage .tile { width: 52px; height: 60px; border-radius: 10px; border: 2px solid var(--ink); display: flex; align-items: center; justify-content: center; font-size: 30px; font-weight: 800; background: var(--card); }
.stage .tile.missing { border-style: dashed; color: var(--muted); }
.stage .tile.good { background: var(--ok-soft); border-color: var(--ok); animation: pop var(--dur) ease; }
.stage .tile.wrong { background: var(--bad-soft); border-color: var(--bad); animation: shake var(--dur) ease; }
/* картууд */
.stage .cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; }
.stage .cardo { border: 2px solid var(--line); border-radius: 12px; padding: 10px; text-align: center; background: var(--card); font-weight: 600; }
.stage .cardo .emoji { font-size: 34px; display: block; }
.stage .cardo.good { border-color: var(--ok); background: var(--ok-soft); animation: pop var(--dur) ease; }
.stage .cardo.wrong { border-color: var(--bad); background: var(--bad-soft); animation: shake var(--dur) ease; }
.stage .confetti { position: absolute; top: 0; font-size: 22px; animation: fall 1.4s ease-in forwards; pointer-events: none; }
@keyframes pop { 0% { transform: scale(.4); opacity: 0; } 60% { transform: scale(1.15); opacity: 1; } 100% { transform: scale(1); } }
@keyframes shake { 0%, 100% { transform: translateX(0); } 25% { transform: translateX(-6px); } 75% { transform: translateX(6px); } }
@keyframes fall { 0% { transform: translateY(-20px) rotate(0); opacity: 1; } 100% { transform: translateY(240px) rotate(300deg); opacity: 0; } }

.answer-input { font-size: 28px; width: 150px; padding: 8px 12px; border-radius: 12px; border: 2px solid var(--line); background: var(--bg); }

/* AI багшийн чат */
.chat { display: flex; flex-direction: column; gap: 8px; max-height: 50vh; overflow-y: auto; padding: 4px; }
.chat .msg { padding: 10px 14px; border-radius: 14px; max-width: 88%; white-space: pre-wrap; }
.chat .msg.user { align-self: flex-end; background: var(--brand-soft); }
.chat .msg.assistant { align-self: flex-start; background: var(--info-soft); }
.chat-input { display: flex; gap: 8px; margin-top: 8px; }
.chat-input input { flex: 1; min-height: 48px; padding: 8px 12px; border-radius: 12px; border: 2px solid var(--line); background: var(--bg); }

/* Хичээл */
.lesson-step { margin: 12px 0; }
.lesson-step p { font-size: 19px; }
.lesson-step .note { color: var(--muted); font-size: 15px; }

/* Багшийн загварын маягт */
.tpl-fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 8px; }
.item-list li { align-items: flex-start; }

@media (min-width: 720px) { body { font-size: 17px; } .stage .obj { font-size: 38px; } }
/* Хэвлэх: зөвхөн PIN хүснэгт (багш сурагчдад тараана) */
@media print {
  body * { visibility: hidden; }
  #cd-pins, #cd-pins * { visibility: visible; }
  #cd-pins { position: absolute; left: 0; top: 0; width: 100%; border: 0; background: #fff; color: #000; }
  #cd-pins .btn { display: none !important; }
}