/* 한국어 숫자 읽기 게임 */

:root {
  --bg: #0e1016;
  --bg-glow: #171b28;
  --surface: #171a23;
  --surface-2: #1e2230;
  --border: #2a2f3d;
  --text: #e7eaf2;
  --muted: #8b93a8;
  --accent: #7f9cff;
  --accent-soft: rgba(127, 156, 255, 0.14);
  --gold: #ffd166;
  --good: #4ade80;
  --good-soft: rgba(74, 222, 128, 0.12);
  --bad: #fb7185;
  --bad-soft: rgba(251, 113, 133, 0.12);
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f5fa;
    --bg-glow: #e7ecf8;
    --surface: #ffffff;
    --surface-2: #f0f3f9;
    --border: #dde2ec;
    --text: #1a1e29;
    --muted: #6a7285;
    --accent: #3b62e0;
    --accent-soft: rgba(59, 98, 224, 0.1);
    --gold: #b57d09;
    --good: #16a34a;
    --good-soft: rgba(22, 163, 74, 0.1);
    --bad: #dc2626;
    --bad-soft: rgba(220, 38, 38, 0.09);
    --shadow: 0 10px 30px rgba(28, 40, 80, 0.08);
  }
}

* { box-sizing: border-box; }

/* hidden 은 UA 스타일일 뿐이라 display 를 정한 클래스가 이긴다. 한 번에 막아 둔다. */
[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  padding: 20px 16px 56px;
  background:
    radial-gradient(900px 500px at 50% -180px, var(--bg-glow), transparent 70%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", Pretendard,
    "Noto Sans KR", "Malgun Gothic", system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 660px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ---------- 상단 ---------- */

.crumb { font-size: 13px; margin-bottom: -6px; }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a:hover { color: var(--accent); }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }

.logo {
  width: 40px;
  height: 40px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--accent), #b98cff);
  color: #fff;
  font-weight: 800;
  font-size: 19px;
  box-shadow: var(--shadow);
}

/* 각도 익히기 */
.logo-angle { background: linear-gradient(145deg, #ffa94d, #ff6b8b); font-size: 22px; }
/* 쌓기나무 규칙 찾기 */
.logo-stack { background: linear-gradient(145deg, #e0a85a, #b9773a); }
.logo-stack svg { width: 26px; height: 26px; }
.game-card .logo-stack svg { width: 30px; height: 30px; }
/* 시간 계산 */
.logo-time { background: linear-gradient(145deg, #4fd1c5, #3b82f6); font-size: 22px; }

.brand h1 { margin: 0; font-size: 17px; letter-spacing: -0.2px; }
/* 좁은 화면에서 한글이 단어 중간에서 끊기지 않도록 */
.brand p { margin: 0; font-size: 12px; color: var(--muted); word-break: keep-all; }

.icon-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 7px 11px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}
.icon-btn:hover { border-color: var(--accent); }
.icon-btn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }

.topbar-actions { display: flex; gap: 6px; flex: none; }

/* ---------- 게임 목록 (index.html) ---------- */

.game-list { display: flex; flex-direction: column; gap: 10px; margin: 0; padding: 0; list-style: none; }

.game-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.12s ease;
}
.game-card:hover,
.game-card:focus-visible { border-color: var(--accent); }
.game-card .logo { width: 48px; height: 48px; font-size: 22px; box-shadow: none; }
.game-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.game-text b { font-size: 16px; }
.game-text span { font-size: 13px; color: var(--muted); word-break: keep-all; }
.game-card .go { margin-left: auto; flex: none; color: var(--muted); font-size: 20px; }

/* ---------- 설정 ---------- */

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.control-row + .control-row { margin-top: 10px; }

.control-label {
  font-size: 12px;
  color: var(--muted);
  width: 34px;
  flex: none;
}

.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.segmented button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 13px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.12s ease;
}
.segmented button:hover { color: var(--text); border-color: var(--accent); }
.segmented button[aria-pressed="true"] {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.segmented button:disabled {
  opacity: 0.4;
  border-style: dashed;
  cursor: not-allowed;
}
.segmented button:disabled:hover {
  color: var(--muted);
  border-color: var(--border);
}

.level-hint { font-size: 12px; color: var(--muted); margin: 8px 0 0; }

/* ---------- 통계 ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 9px 6px;
  text-align: center;
}
.stat dt { font-size: 11px; color: var(--muted); margin: 0; }
.stat dd {
  margin: 1px 0 0;
  font-size: 19px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.3px;
}
.stat.is-low dd { color: var(--bad); }

/* ---------- 문제 ---------- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 18px 18px;
  box-shadow: var(--shadow);
}

.prompt {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 10px;
}

.question {
  text-align: center;
  font-size: clamp(26px, 7.2vw, 44px);
  font-weight: 800;
  /* 쉼표가 없으므로 자릿수를 세기 쉽도록 살짝 벌린다 */
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  word-break: keep-all;
  overflow-wrap: anywhere;
  line-height: 1.25;
  margin: 0;
}
.question.is-hangul {
  font-size: clamp(20px, 5.2vw, 32px);
  letter-spacing: -0.5px;
}

/* 자리표 */
.place-table {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 14px;
}
.place-table[hidden] { display: none; }

.place-group {
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 4px 10px 6px;
  text-align: center;
  min-width: 62px;
  background: var(--surface-2);
}
.place-group.is-zero { opacity: 0.4; }
.place-label { display: block; font-size: 11px; color: var(--accent); font-weight: 700; }
.place-digits { display: block; font-size: 16px; font-variant-numeric: tabular-nums; letter-spacing: 1px; }

/* ---------- 입력 ---------- */

.fields { margin-top: 18px; display: flex; flex-direction: column; gap: 10px; }

.field { display: flex; flex-direction: column; gap: 5px; }
.field[hidden] { display: none; }

.field-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}
.field-head label { font-size: 13px; font-weight: 600; word-break: keep-all; }
.field-head .eg { font-size: 11.5px; color: var(--muted); }

.field input {
  width: 100%;
  border: 1.5px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  border-radius: 11px;
  padding: 12px 13px;
  font: inherit;
  font-size: 17px;
  outline: none;
  transition: border-color 0.12s ease, background 0.12s ease;
}
.field input::placeholder { color: var(--muted); opacity: 0.65; }
.field input:focus { border-color: var(--accent); }
.field.is-good input { border-color: var(--good); background: var(--good-soft); }
.field.is-bad input { border-color: var(--bad); background: var(--bad-soft); }

.field-msg { font-size: 12.5px; min-height: 0; }
.field-msg:empty { display: none; }
.field.is-good .field-msg { color: var(--good); }
.field.is-bad .field-msg { color: var(--bad); }

/* ---------- 버튼 ---------- */

.actions { display: flex; gap: 8px; margin-top: 16px; }

.btn {
  border-radius: 11px;
  padding: 12px 16px;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  transition: filter 0.12s ease, border-color 0.12s ease;
}
.btn:hover { filter: brightness(1.12); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn:disabled:hover { filter: none; border-color: var(--border); }
.btn-primary {
  flex: 1;
  border-color: transparent;
  background: linear-gradient(145deg, var(--accent), #9a7dff);
  color: #fff;
}
.btn-ghost { flex: none; color: var(--muted); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }

/* ---------- 피드백 ---------- */

.feedback { margin-top: 16px; }
.feedback[hidden] { display: none; }

.verdict {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 16px;
  padding: 10px 12px;
  border-radius: 11px;
}
.verdict.good { background: var(--good-soft); color: var(--good); }
.verdict.bad { background: var(--bad-soft); color: var(--bad); }
.verdict .score-delta { margin-left: auto; font-size: 13px; font-variant-numeric: tabular-nums; }

.unlock {
  margin-top: 10px;
  padding: 11px 13px;
  border: 1px solid var(--gold);
  border-radius: 11px;
  background: linear-gradient(135deg, rgba(255, 209, 102, 0.16), var(--accent-soft));
  font-size: 14px;
  font-weight: 600;
  word-break: keep-all;
}

.answer-line {
  margin-top: 10px;
  padding: 11px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 11px;
  font-size: 15px;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
.answer-line b { color: var(--accent); font-weight: 700; }
.answer-line .sep { color: var(--muted); margin: 0 7px; }

.breakdown {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  font-size: 14px;
}
.breakdown th {
  text-align: left;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--muted);
  padding: 3px 8px;
  border-bottom: 1px solid var(--border);
}
.breakdown td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  font-variant-numeric: tabular-nums;
}
.breakdown tr:last-child td { border-bottom: none; }
.breakdown tr.sum td {
  font-weight: 700;
  border-top: 2px solid var(--border);
}
.breakdown .u { color: var(--accent); font-weight: 700; width: 46px; }
.breakdown .h { font-variant-numeric: normal; }

.tip {
  margin-top: 10px;
  padding: 9px 12px;
  border-left: 3px solid var(--gold);
  background: var(--surface-2);
  border-radius: 0 10px 10px 0;
  font-size: 13px;
  color: var(--muted);
}
.tip b { color: var(--text); }

/* ---------- 결과 ---------- */

.result { text-align: center; padding: 10px 0 4px; }
.result h2 { margin: 0 0 6px; font-size: 20px; }
.result .big {
  font-size: 46px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.result p { color: var(--muted); margin: 6px 0 16px; font-size: 14px; }

/* ---------- 규칙 시트 ---------- */

.guide[hidden] { display: none; }
.guide h2 { font-size: 15px; margin: 0 0 10px; }
.guide ul { margin: 0; padding-left: 18px; }
.guide li { margin-bottom: 7px; font-size: 13.5px; color: var(--muted); }
.guide li b { color: var(--text); }
.guide code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 12.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--text);
}

.unit-scale {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 0 0 12px;
}
.unit-scale span {
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 9px;
  padding: 5px 9px;
  font-size: 12px;
  color: var(--muted);
}
.unit-scale b { color: var(--accent); }

.foot { text-align: center; font-size: 12px; color: var(--muted); }
.foot kbd {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 11px;
  font-family: inherit;
}

@media (max-width: 420px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .control-label { width: 100%; }
}

@media (prefers-reduced-motion: no-preference) {
  .card { animation: rise 0.22s ease both; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: none; }
  }
}