:root {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
  touch-action: manipulation;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100dvh;
  overflow: hidden;
  background: #0a0a0a;
  color: #f5f5f5;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
  overscroll-behavior: none;
}

main {
  height: 100%;
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding:
    max(60px, env(safe-area-inset-top))
    16px
    max(20px, env(safe-area-inset-bottom));
  gap: 16px;
}

/* 점수바: SCORE | TIME | BEST | New 버튼 */
.score-bar {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.score-box {
  flex: 1;
  background: #161616;
  border: 1px solid #2a2a2a;
  border-radius: 12px;
  padding: 8px 12px;
  text-align: center;
  min-width: 0;
}

.score-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #a0a0a0;
}

.score-val,
.best-val {
  display: block;
  font-size: 22px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: #f5f5f5;
  margin-top: 2px;
  line-height: 1.1;
}

.new-btn {
  flex: 0 0 auto;
  font: inherit;
  color: #fff;
  background: #4f9eff;
  border: none;
  border-radius: 12px;
  padding: 0 18px;
  min-height: 56px;
  cursor: pointer;
  font-weight: 700;
  font-size: 14px;
  -webkit-tap-highlight-color: transparent;
}

.new-btn:active { background: #3d8ae8; }

/* 시간 표시 */
.time-unit { font-size: 13px; font-weight: 700; color: #a0a0a0; }
.score-box.low .time-val,
.score-box.low .time-unit { color: #ff5d5d; }

/* 게임 영역 — 가운데 정렬된 격자 */
#game {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  min-height: 0;
}

/* 6×6 판 + 숫자 패드. 검은 칸은 칸막이 경계(숫자가 있으면 그 행·열에서 사용됨). */
.st {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  grid-template-rows: repeat(6, minmax(0, 1fr));
  gap: 4px;
  width: min(92vw, 52vh, 420px);
  aspect-ratio: 1;
}
.st-cell {
  margin: 0;
  padding: 0;
  background: #161620;
  color: #f5f5f5;
  cursor: pointer;
  border: 1.5px solid #3a3a48;
  border-radius: 7px;
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box;
  font: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(18px, 6.5vw, 30px);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}
.st-cell.black {
  background: repeating-linear-gradient(45deg, #050508 0 5px, #15151d 5px 10px);
  border-color: #2a2a36;
  color: #e8e8f0;
  cursor: default;
}
.st-cell.fixed { background: #20202c; color: #ffd166; cursor: default; border-color: #4a4a5c; }
.st-cell.sel { border-color: #8fb7ff; box-shadow: 0 0 0 2px #8fb7ff inset; }
.st-cell.peer:not(.black):not(.sel) { background: #1b1d2b; }
.st-cell.bad { background: #4a2230; border-color: #7a2f44; }
.st-cell.bad:not(.fixed) { color: #ff6b6b; }
.st.solved-flash .st-cell:not(.black) { background: #1d3a2a; border-color: #2f6b48; }
.st.solved-flash .st-cell:not(.black):not(.fixed) { color: #6ee7a0; }

.st-pad {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  width: min(92vw, 420px);
  margin-top: clamp(8px, 2vh, 16px);
}
.st-key {
  margin: 0;
  min-height: clamp(40px, 7vh, 52px);
  border-radius: 10px;
  border: 1.5px solid #3a3a48;
  background: #1c1c28;
  color: #f5f5f5;
  font: inherit;
  font-size: clamp(18px, 5.5vw, 24px);
  font-weight: 800;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.st-key:active { background: #2a2a3a; }
.st-key.erase { color: #b8b8c8; }

.overlay-sub { margin: -4px 0 4px; font-size: 14px; font-weight: 600; color: #a0a0a0; }
.overlay-howto { margin: 0 0 4px; font-size: 13px; line-height: 1.45; color: #b8b8b8; }
.overlay-card .start-btn { background: #4f9eff; border-color: #4f9eff; }

/* 좌상단 ← 홈, 우상단 🏆 명예의 전당 — 모든 게임 공통 chrome */
.home-link,
.hof-link {
  position: fixed;
  top: max(12px, env(safe-area-inset-top));
  z-index: 10;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  text-decoration: none;
  font-size: 20px;
  font-weight: 600;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: background 0.15s ease;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.home-link { left:  max(12px, env(safe-area-inset-left)); }
.hof-link  { right: max(12px, env(safe-area-inset-right)); }

@media (hover: hover) {
  .home-link:hover,
  .hof-link:hover {
    background: rgba(0, 0, 0, 0.55);
  }
}

/* 오버레이 (게임 종료 / 완료 시 점수 + 저장 버튼) */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  padding: 20px;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.overlay[hidden] { display: none; }

.overlay-card {
  background: #161616;
  border: 1px solid #2a2a2a;
  border-radius: 18px;
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  text-align: center;
  min-width: 240px;
  max-width: 320px;
  width: 100%;
}

.overlay-card h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.overlay-score {
  margin: 0;
  font-size: 56px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
  line-height: 1;
}

.overlay-card button {
  font: inherit;
  color: #fff;
  background: rgba(255, 255, 255, 0.10);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  padding: 12px 20px;
  min-height: 44px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  width: 100%;
  -webkit-tap-highlight-color: transparent;
}

.overlay-card button:active {
  background: rgba(255, 255, 255, 0.18);
}

.overlay-card .save-btn {
  background: #4f9eff;
  border-color: #4f9eff;
}

.overlay-card .save-btn:active {
  background: #3d8ae8;
}