/* 시간 계산 — css/style.css 위에 얹는다 */

:root {
  --bar-short: #7f9cff;
  --bar-long: #ffb35c;
}

@media (prefers-color-scheme: light) {
  :root {
    --bar-short: #5b7cf0;
    --bar-long: #f08a1c;
  }
}

/* ---------- 문제 ---------- */

/* 학습지의 말풍선 */
.story {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 2px 0 4px;
}
.story .avatar {
  flex: none;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 24px;
}
.story-name { display: block; font-size: 12.5px; color: var(--muted); margin: 0 0 4px 4px; }
.bubble {
  position: relative;
  margin: 0;
  padding: 11px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px 16px 16px 16px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
  word-break: keep-all;
}

/* 두 시간 */
.pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 4px;
}
.tile {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 74px;
  padding: 12px 8px;
  border: 1.5px solid var(--border);
  border-radius: 14px;
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  text-align: center;
}
.tile-text {
  font-size: clamp(19px, 5vw, 25px);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  word-break: keep-all;
}

.hint-text {
  margin: 12px 0 0;
  padding: 9px 12px;
  border-left: 3px solid var(--accent);
  background: var(--surface-2);
  border-radius: 0 10px 10px 0;
  font-size: 13px;
  color: var(--muted);
  word-break: keep-all;
}

/* ---------- 답 ---------- */

.field-head .label { font-size: 13px; font-weight: 600; word-break: keep-all; }

.choice {
  position: relative;
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 12px;
  padding: 13px 8px;
  font: inherit;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  word-break: keep-all;
  transition: border-color 0.12s ease, background 0.12s ease;
}
.choice:hover { border-color: var(--accent); }
.choice:disabled { cursor: default; opacity: 0.5; }
.choice:disabled:hover { border-color: var(--border); }
.choice[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.choice.is-good,
.choice.is-good:hover { border-color: var(--good); background: var(--good-soft); color: var(--good); opacity: 1; }
.choice.is-bad,
.choice.is-bad:hover { border-color: var(--bad); background: var(--bad-soft); color: var(--bad); opacity: 1; }
.choice.is-answer,
.choice.is-answer:hover { border-color: var(--good); color: var(--good); opacity: 1; }
.choice kbd {
  position: absolute;
  top: 4px;
  right: 7px;
  font-family: inherit;
  font-size: 10px;
  font-weight: 600;
  color: var(--muted);
}
@media (hover: none) { .choice kbd { display: none; } }

.picks {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

/* 「115분 = □시간 □분」 */
.time-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 6px;
}
.time-row .given { font-size: 22px; font-weight: 800; font-variant-numeric: tabular-nums; }
.time-row .op { font-size: 22px; font-weight: 700; color: var(--muted); margin: 0 2px; }
.time-row .tail { font-size: 17px; font-weight: 700; }
.unit-box { display: inline-flex; align-items: center; gap: 4px; }
.unit-box .u { font-size: 17px; font-weight: 600; }
.field .time-row input {
  width: 3.6em;
  padding: 10px 4px;
  text-align: center;
  font-size: 19px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.field .time-row input.is-good { border-color: var(--good); background: var(--good-soft); }
.field .time-row input.is-bad { border-color: var(--bad); background: var(--bad-soft); }

/* ---------- 풀이 ---------- */

.answer-line { line-height: 1.75; font-variant-numeric: tabular-nums; }
/* 식의 한 마디. 너무 길면 그 안에서는 줄을 바꾼다 */
.eq { display: inline-block; max-width: 100%; }

.bars {
  margin-top: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 11px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.bar-row {
  display: grid;
  grid-template-columns: minmax(64px, auto) 1fr auto;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}
.bar-name { font-weight: 600; white-space: nowrap; }
.bar-track { height: 14px; border-radius: 7px; background: var(--surface-2); overflow: hidden; }
.bar { display: block; height: 100%; border-radius: 7px; background: var(--bar-short); }
.bar.is-long { background: var(--bar-long); }
.bar-value { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.bar-gap { text-align: right; font-size: 13px; font-weight: 700; color: var(--bar-long); }

@media (max-width: 420px) {
  .bubble { font-size: 15.5px; }
  .field .time-row input { width: 3.1em; font-size: 17px; }
  .bar-row { grid-template-columns: 1fr auto; }
  .bar-row .bar-track { grid-column: 1 / -1; grid-row: 2; }
}

.foot { word-break: keep-all; }
@media (hover: none) and (pointer: coarse) {
  .foot { display: none; }
}