/* ============================================================
   슐테 테이블 전용 스타일
   - 격자가 곧 게임이다: 정사각 셀을 CSS grid로 깔고, 셀 크기·글자
     크기는 격자 수(--n)에 따라 board 폭을 나눠 자동으로 맞춘다.
   - 색은 사이트 종이 톤을 따르되, 다음에 눌러야 할 칸/맞은 칸/틀린
     칸만 주묵색·초록·붉은색으로 잠깐 신호를 준다.
   ============================================================ */

:root {
  --st-good: #2f9e52;        /* 맞게 짚은 칸 */
  --st-good-bg: #e7f2e9;
  --st-bad: #c0392b;         /* 순서 틀림 */
  --st-bad-bg: #f6dcd6;
  --st-cell: #fdfbf6;        /* 기본 칸 */
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --st-good: #7fd694;
    --st-good-bg: #1f3325;
    --st-bad: #ff8f7d;
    --st-bad-bg: #4a231c;
    --st-cell: #241e17;
  }
}
:root[data-theme="dark"] {
  --st-good: #7fd694;
  --st-good-bg: #1f3325;
  --st-bad: #ff8f7d;
  --st-bad-bg: #4a231c;
  --st-cell: #241e17;
}

/* ---- 도입부 ---- */
.tool-intro { padding: clamp(30px, 5vw, 56px) 0 clamp(18px, 3vw, 30px); }
.tool-intro h1 { margin: 0 0 var(--space-4); }
.tool-intro .lead {
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--color-text-sub);
  max-width: 54ch;
  margin: 0;
}
.tool-intro .lead strong { color: var(--color-text); }
.tool-intro .lead-note {
  margin: var(--space-3) 0 0;
  font-size: .88rem;
  color: var(--color-text-sub);
}

/* ---- 설정 ---- */
.st-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
}
.st-field {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}
.st-lab {
  font-size: .95rem;
  font-weight: 700;
  color: var(--color-text-sub);
  min-width: 68px;
}
.st-field-note {
  flex-basis: 100%;
  font-size: .84rem;
  color: var(--color-text-sub);
  padding-left: 68px;
}
.st-chips { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.st-chip {
  font: inherit;
  font-size: 1rem;
  cursor: pointer;
  touch-action: manipulation;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}
.st-chip:hover:not(:disabled) { border-color: var(--color-primary); }
.st-chip[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  font-weight: 700;
}
.st-chip:disabled {
  opacity: .4;
  cursor: not-allowed;
  text-decoration: line-through;
}

/* ---- 상태 줄 ---- */
.st-stage { max-width: 560px; margin: 0 auto; }
.st-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}
.st-stat {
  font-size: 1rem;
  color: var(--color-text-sub);
  font-variant-numeric: tabular-nums;
}
.st-stat-r { text-align: right; }
.st-stat b { font-size: 1.35rem; color: var(--color-text); }
.st-unit { font-size: .9rem; margin-left: 2px; color: var(--color-text-sub); }
.st-next {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .92rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
}
.st-next b {
  font-size: 1.15rem;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

/* ---- 게임판 ---- */
.st-board-wrap {
  position: relative;
  display: grid;
}
.st-board {
  --n: 5;
  display: grid;
  grid-template-columns: repeat(var(--n), 1fr);
  gap: clamp(3px, 1.1vw, 7px);
  width: 100%;
  aspect-ratio: 1 / 1;
  padding: clamp(6px, 1.6vw, 10px);
  background: var(--color-primary-weak);
  border: 1px solid var(--color-border);
  border-radius: 18px;
  box-shadow: var(--shadow-sm);
}
.st-cell {
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--st-cell);
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
  /* 글자 크기는 격자 수에 반비례: 셀이 작을수록 작게 */
  font-size: clamp(.8rem, calc(30vw / var(--n)), 2.4rem);
  transition: background .1s ease, color .1s ease, transform .06s ease;
}
.st-cell:focus-visible { outline: 3px solid var(--color-text); outline-offset: 2px; }
.st-cell.is-done {
  background: var(--st-good-bg);
  color: var(--st-good);
  border-color: transparent;
  cursor: default;
}
.st-cell.is-bad {
  background: var(--st-bad-bg);
  color: var(--st-bad);
  border-color: var(--st-bad);
  animation: st-shake .28s ease;
}
@keyframes st-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}
/* 게임 시작 전에는 칸을 살짝 죽여 둔다 */
.st-board.is-idle .st-cell { opacity: .55; }

/* ---- 중앙 고정점 ---- */
.st-fixation {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--color-primary) 22%, transparent);
  pointer-events: none;
  z-index: 2;
}

/* ---- 오버레이(시작·완주) ---- */
.st-board-wrap > .st-overlay,
.st-board-wrap > .st-board,
.st-board-wrap > .st-fixation { grid-area: 1 / 1; }
.st-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  z-index: 3;
  background: color-mix(in srgb, var(--color-bg) 84%, transparent);
  -webkit-backdrop-filter: blur(3px);
          backdrop-filter: blur(3px);
}
@supports not (background: color-mix(in srgb, red 50%, transparent)) {
  .st-overlay { background: rgba(243, 240, 232, .9); }
  :root[data-theme="dark"] .st-overlay { background: rgba(23, 19, 14, .9); }
}
.st-overlay-panel {
  text-align: center;
  padding: var(--space-4) var(--space-5);
  max-width: 100%;
}
.st-ov-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}
.st-ov-sub { margin: 0 0 var(--space-4); font-size: .95rem; color: var(--color-text-sub); }
.st-ov-label { margin: 0; font-size: 1rem; color: var(--color-text-sub); }
.st-ov-time {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.1;
}
.st-ov-time b { font-size: 3.4rem; color: var(--color-primary); }
.st-ov-time .st-unit { font-size: 1.2rem; }
.st-ov-grade {
  margin: var(--space-1) 0 var(--space-3);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
}
.st-ov-line { margin: 0 0 var(--space-1); font-size: .95rem; color: var(--color-text-sub); }
.st-ov-line b { color: var(--color-text); }
.st-new { color: var(--color-primary); font-weight: 700; }

/* 완주 화면 최근 기록 막대 */
.st-trend {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 5px;
  height: 54px;
  margin: var(--space-3) 0 var(--space-4);
}
.st-trend-bar {
  width: 16px;
  min-height: 4px;
  border-radius: 4px 4px 0 0;
  background: var(--color-grid-strong);
}
.st-trend-bar.is-latest { background: var(--color-primary); }
.st-trend-bar.is-best { background: var(--st-good); }

.st-btn-big {
  font: inherit;
  font-size: 1.3rem;
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
  padding: 16px 42px;
  border-radius: 999px;
  border: 0;
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow);
}
.st-btn-big:hover { filter: brightness(1.06); }
.st-btn-big:active { transform: scale(.97); }

/* ---- 안내 문구 ---- */
.st-msg {
  min-height: 1.7em;
  margin: var(--space-3) 0 0;
  text-align: center;
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

/* ---- 최근 기록 줄(판 아래) ---- */
.st-recent {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--space-2);
}
.st-recent-lab { font-size: .85rem; font-weight: 700; color: var(--color-text-sub); }
.st-recent-list { display: flex; gap: 6px; flex-wrap: wrap; }
.st-recent-item {
  padding: 4px 10px;
  font-size: .9rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  border-radius: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-sub);
}
.st-recent-item.is-best { border-color: var(--st-good); color: var(--st-good); }

/* ---- 본문 ---- */
.prose { max-width: 720px; margin: clamp(40px, 6vw, 64px) auto 0; }
.prose h2 { margin: 0 0 var(--space-3); }
.prose p { margin: 0 0 var(--space-3); color: var(--color-text); }
.prose ul { margin: 0; padding-left: 1.2em; }
.prose li { margin-bottom: var(--space-2); }
.prose li strong { color: var(--color-text); }

@media (prefers-reduced-motion: reduce) {
  .st-cell { transition: none; }
  .st-cell.is-bad { animation: none; }
}

@media (max-width: 420px) {
  .st-lab { min-width: 100%; }
  .st-field-note { padding-left: 0; }
  .st-stat { font-size: .9rem; }
  .st-stat b { font-size: 1.2rem; }
}