:root {
  --bg: #faf7f2; --card: #fff; --ink: #222; --sub: #777; --line: #e6dfd3;
  --accent: #c0392b; --accent-ink: #fff; --soft: #f3ebe0; --ok: #2e7d32;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #17140f; --card: #211d17; --ink: #eee7da; --sub: #a39a8a; --line: #3a342a;
    --accent: #e0624f; --accent-ink: #1a0f0d; --soft: #2b261d; --ok: #7bc47f; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.5 -apple-system, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif; }
.top { display: flex; justify-content: space-between; align-items: center;
  padding: 10px 16px; border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--bg); z-index: 5; }
.top h1 { margin: 0; font-size: 18px; color: var(--accent); }
.opts { display: flex; gap: 12px; font-size: 13px; color: var(--sub); align-items: center; }
.opts select { font: inherit; background: var(--card); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; }
main { max-width: 640px; margin: 0 auto; padding: 16px 16px 90px; }
.tabs { position: fixed; bottom: 0; left: 0; right: 0; display: flex; background: var(--card); border-top: 1px solid var(--line); z-index: 5; }
.tabs button { flex: 1; padding: 14px 0; border: 0; background: none; color: var(--sub); font: inherit; font-size: 14px; cursor: pointer; }
.tabs button.on { color: var(--accent); font-weight: 700; box-shadow: inset 0 2px 0 var(--accent); }

h2 { font-size: 20px; margin: 4px 0 12px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 12px; }
.sub { color: var(--sub); font-size: 13px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
button.btn { font: inherit; font-size: 14px; padding: 8px 14px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); cursor: pointer; }
button.btn.pri { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.btn:disabled { opacity: .4; cursor: default; }
select.lesson { font: inherit; padding: 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--ink); width: 100%; margin-bottom: 12px; }

.lesson-item { display: flex; justify-content: space-between; align-items: center; cursor: pointer; }
.lesson-item .zh { font-size: 20px; }
.badge { font-size: 12px; padding: 2px 8px; border-radius: 99px; background: var(--soft); color: var(--sub); }
.badge.ok { color: var(--ok); }
.stat { display: flex; gap: 12px; } .stat > div { flex: 1; text-align: center; }
.stat b { display: block; font-size: 26px; color: var(--accent); }

.bubble { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 10px; }
.bubble .who { flex: none; width: 28px; height: 28px; border-radius: 50%; background: var(--soft); text-align: center; line-height: 28px; font-weight: 700; font-size: 13px; }
.bubble .body { flex: 1; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 8px 12px; }
.bubble.me .body { border-color: var(--accent); }
.bubble.active .body { outline: 2px solid var(--accent); }
.zh-big { font-size: 22px; line-height: 1.5; }
.py { color: var(--accent); font-size: 14px; }
.hide-py .py { display: none; }
.ko { color: var(--sub); font-size: 14px; }
.spk { flex: none; border: 0; background: var(--soft); border-radius: 50%; width: 32px; height: 32px; cursor: pointer; color: var(--ink); }
.blur { filter: blur(6px); cursor: pointer; user-select: none; }

.tok { display: inline-block; text-align: center; margin: 2px 3px; padding: 2px 4px; border-radius: 6px; cursor: pointer; }
.tok:hover, .tok.on { background: var(--soft); }
.tok .py { display: block; font-size: 11px; min-height: 16px; }
.tok .h { font-size: 24px; }
.punct { font-size: 24px; margin: 0 2px; }
.pop { position: sticky; bottom: 70px; background: var(--card); border: 2px solid var(--accent); border-radius: 12px; padding: 10px 14px; margin-top: 12px; }

.flash { text-align: center; padding: 28px 16px; min-height: 220px; display: flex; flex-direction: column; justify-content: center; gap: 8px; cursor: pointer; }
.flash .zh-big { font-size: 44px; }
.grades { display: flex; gap: 8px; } .grades .btn { flex: 1; }

.chars { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.chars button { font-size: 24px; width: 48px; height: 48px; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; }
.chars button.on { border-color: var(--accent); color: var(--accent); }
#hz { width: 260px; height: 260px; margin: 0 auto 12px; background:
  linear-gradient(var(--line), var(--line)) center/1px 100% no-repeat,
  linear-gradient(var(--line), var(--line)) center/100% 1px no-repeat, var(--card);
  border: 1px solid var(--line); border-radius: 12px; }
.toast { position: fixed; bottom: 70px; left: 50%; transform: translateX(-50%); background: #333; color: #fff; padding: 8px 14px; border-radius: 8px; font-size: 14px; z-index: 9; }

/* ---- 학습 원리 반영 UI ---- */
.stat { flex-wrap: wrap; }
.goal { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--line); cursor: pointer; }
.goal:last-child { border-bottom: 0; }
.goal.ok span:first-child { color: var(--ok); }
.why { padding-left: 18px; margin: 8px 0 0; font-size: 14px; } .why li { margin-bottom: 6px; }
summary { cursor: pointer; font-weight: 600; }
.bubble .btns { display: flex; flex-direction: column; gap: 6px; }
.res { margin-top: 4px; }
.py.fade { opacity: 0; }
.tok:hover .py.fade, .tok.on .py.fade { opacity: 1; }
.optlist { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0; }
.btn.opt { padding: 14px 8px; font-size: 16px; }
.btn.opt.ok { background: var(--ok); color: #fff; border-color: var(--ok); }
.btn.opt.bad { background: #b3261e; color: #fff; border-color: #b3261e; }
.btn.opt.dim { opacity: .45; }
.flash input { font: inherit; font-size: 20px; text-align: center; padding: 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
.blank { color: var(--accent); border-bottom: 2px solid var(--accent); }
.ex { margin-top: 10px; padding: 8px 12px; background: var(--soft); border-radius: 8px; text-align: left; }
.fb { margin-top: 4px; } .fb.ok { border-color: var(--ok); } .fb.bad { border-color: #b3261e; } .fb.partial { border-color: #c98a00; }
.tones { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 10px 0; }
.tones .btn { padding: 10px 6px; }

/* ---- 쓰기 보드 (아이패드·애플펜슬) ---- */
.seg { display: flex; gap: 6px; margin-bottom: 14px; }
.seg button { flex: 1; padding: 12px 6px; font: inherit; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; }
.seg button.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 700; }
.board, .padwrap {
  margin: 0 auto 12px; border: 1px solid var(--line); border-radius: 12px; background-color: var(--card);
  background-image:
    linear-gradient(var(--line), var(--line)), linear-gradient(var(--line), var(--line)),
    linear-gradient(to top right, transparent calc(50% - .5px), var(--line) 50%, transparent calc(50% + .5px)),
    linear-gradient(to bottom right, transparent calc(50% - .5px), var(--line) 50%, transparent calc(50% + .5px));
  background-size: 1px 100%, 100% 1px, 100% 100%, 100% 100%;
  background-position: center, center, center, center; background-repeat: no-repeat;
  touch-action: none; -webkit-user-select: none; user-select: none; -webkit-touch-callout: none;
}
.board svg, .padwrap canvas { display: block; touch-action: none; -webkit-user-select: none; user-select: none; }
.board.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.wrow { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.wrow .board { margin: 0 0 12px; }
.chk { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--sub); }
.chk input { width: 20px; height: 20px; }

/* ---- 아이패드 ---- */
html { touch-action: manipulation; -webkit-text-size-adjust: 100%; }
.tabs { padding-bottom: env(safe-area-inset-bottom); }
.top { padding-top: max(10px, env(safe-area-inset-top)); }
@media (min-width: 700px) {
  body { font-size: 18px; }
  main { max-width: 760px; }
  .tabs button { padding: 18px 0; font-size: 16px; }
  .btn, button.btn { font-size: 16px; padding: 12px 18px; }
  .zh-big { font-size: 26px; }
  .flash .zh-big { font-size: 56px; }
}

/* ---- 그림책 (유치원 과정) ---- */
.kcard { display: flex; gap: 14px; align-items: center; cursor: pointer; }
.kem { font-size: 40px; min-width: 64px; text-align: center; }
.chips { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.chips button { padding: 8px 14px; border-radius: 99px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font: inherit; font-size: 14px; cursor: pointer; }
.chips button.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.pgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 10px; margin-bottom: 12px; }
.pgrid.big { grid-template-columns: 1fr 1fr; }
.pcard { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 12px 6px; border-radius: 14px; border: 2px solid var(--line); background: var(--card); color: var(--ink); font: inherit; cursor: pointer; }
.pcard .pic { font-size: 48px; line-height: 1.2; } .pgrid.big .pcard .pic { font-size: 72px; }
.pcard .zh { font-size: 20px; } .pcard .py { font-size: 12px; color: var(--accent); } .pcard .ko { font-size: 12px; color: var(--sub); }
.pcard.on { border-color: var(--accent); }
.pcard.ok { border-color: var(--ok); background: var(--soft); } .pcard.bad { border-color: #b3261e; } .pcard.dim { opacity: .45; }
.kdet { text-align: center; }
.stage { font-size: 120px; text-align: center; line-height: 1.3; padding: 16px; background: var(--soft); border-radius: 16px; margin-bottom: 12px; }
.btn.back { margin-bottom: 8px; }
.pline { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.pline.active { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.ptxt { flex: 1; min-width: 160px; }
.pz { font-size: 28px; line-height: 2.2; }
ruby rt { font-size: 12px; color: var(--accent); }
ruby.hid { filter: blur(8px); cursor: pointer; }
.hide-py ruby rt { display: none; }
@media (min-width: 700px) { .stage { font-size: 160px; } .pz { font-size: 34px; } ruby rt { font-size: 14px; } .pgrid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); } }
@media (max-width: 480px) { .tabs button { font-size: 12px; } }

/* ---- 삽화 (없으면 이모지로 대체) ---- */
.pimg { display: inline-block; line-height: 0; }
.pimg .emo { display: none; line-height: 1.2; }
.pimg.noimg .emo { display: inline; }
.pimg img { display: block; width: 100%; height: auto; border-radius: 12px; background: var(--soft); }
.pcard .pic { width: 100%; display: flex; justify-content: center; }
.pcard .pimg { width: 100%; max-width: 132px; }
.pgrid.big .pcard .pimg { max-width: 220px; }
.kdpic .pimg { width: 150px; margin-bottom: 6px; }
.ksaypic .pimg { width: 220px; }
.ppic .pimg { width: 84px; }
.pimg.noimg { font-size: 56px; }
.ppic .pimg.noimg { font-size: 44px; } .ksaypic .pimg.noimg { font-size: 96px; } .kdpic .pimg.noimg { font-size: 72px; }
.stage .pimg { width: min(100%, 380px); }
.stage { padding: 12px; }
.stage .pimg.noimg { font-size: 120px; }
@media (min-width: 700px) { .stage .pimg { width: min(100%, 460px); } .ppic .pimg { width: 100px; } .stage .pimg.noimg { font-size: 160px; } }

/* ---- 영상 (Kling) ---- */
.pimg { position: relative; }
.pimg.hasvid { cursor: pointer; }
.pimg .play { position: absolute; right: 8px; bottom: 8px; width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, .55); color: #fff; font-size: 16px; line-height: 1; padding-left: 3px; pointer-events: none; }
.ppic .pimg .play { width: 28px; height: 28px; font-size: 12px; right: 4px; bottom: 4px; }
.pimg video { display: block; width: 100%; border-radius: 12px; background: var(--soft); }
.ppic .pimg.playing { width: min(100%, 260px); }
@media (min-width: 700px) { .ppic .pimg.playing { width: 300px; } }