: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 | 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; }

/* 게임 영역 — 보드/캠버스/그리드 등을 여기에 */
#game {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;   /* 작은 폰에서 아래 조작 요소가 화면 밖으로 밀리지 않게 */
}

/* 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;
}

/* ─── Symmetry ─────────────────────────────────────────── */
.score-box { padding: 8px 6px; }
.time-val { display: block; font-size: 22px; font-weight: 800; font-variant-numeric: tabular-nums; margin-top: 2px; line-height: 1.1; color: #f5f5f5; }
.time-val.low { color: #ff6b6b; }
#game { flex-direction: column; gap: 10px; }
.sy-hint { margin: 0; min-height: 20px; text-align: center; font-size: 15px; font-weight: 700; color: #d0d0d0; }
.sy-miss { margin: 0; font-size: 13px; color: #9a9a9a; }
.sy-board { position: relative; width: min(92vw, 56vh, 420px); aspect-ratio: 1; flex: 0 0 auto; }
.sy-board.ok { animation: sy-ok 0.25s; }
@keyframes sy-ok { 50% { transform: scale(0.97); } }
.sy-grid { position: absolute; inset: 0; display: grid; gap: 3px; }
.sy-cell { margin: 0; padding: 0; border: none; border-radius: 5px; cursor: pointer; -webkit-tap-highlight-color: transparent; min-width: 0; min-height: 0; }
/* 주어진 쪽은 줄무늬 배경, 풀이 쪽은 민무늬 — 색만으로 구분하지 않는다 */
.sy-cell.giv { background: repeating-linear-gradient(45deg, #1f2430 0 5px, #1a1e28 5px 10px); cursor: default; }
.sy-cell.ans { background: #2a2f3c; }
.sy-cell.on { background: #4fc3f7; box-shadow: inset 0 0 0 2px rgba(255,255,255,0.35); }
.sy-cell.giv.on { background: #2f8fc0; }
.sy-cell.bad { animation: sy-bad 0.4s; }
@keyframes sy-bad { 0%, 60% { background: #e74c3c; } }
.sy-cell:disabled { opacity: 1; }
.sy-axis { position: absolute; inset: 0; pointer-events: none; }
.sy-axis::after { content: ""; position: absolute; background: #ffd166; box-shadow: 0 0 6px rgba(255, 209, 102, 0.7); border-radius: 3px; }
.sy-axis.v::after { left: calc(50% - 2px); top: -6px; bottom: -6px; width: 4px; }
.sy-axis.h::after { top: calc(50% - 2px); left: -6px; right: -6px; height: 4px; }
.sy-axis.d::after { left: 50%; top: 50%; width: 141.4%; height: 4px; margin: -2px 0 0 -70.7%; transform: rotate(45deg); }
.sy-axis.p::after { left: calc(50% - 7px); top: calc(50% - 7px); width: 14px; height: 14px; border-radius: 50%; }
.overlay-sub { margin: -4px 0 4px; font-size: 14px; font-weight: 600; color: #a0a0a0; }