: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;
}


#game { flex: 1; display: flex; min-height: 0; align-items: stretch; }
.rt-wrap { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; min-height: 0; padding: 0 14px; }
.rt-info { display: flex; justify-content: space-between; width: 100%; max-width: 360px; font-weight: 800; font-size: 14px; color: #a8b4c4; }
.rt-lives { color: #ff6b6b; letter-spacing: 2px; font-size: 16px; }
.rt-show { display: flex; flex-direction: column; align-items: center; justify-content: center; height: clamp(90px, 16dvh, 130px); width: 100%; max-width: 360px; border-radius: 14px; background: #141a24; }
.rt-op { font-size: clamp(44px, 10dvh, 68px); font-weight: 800; line-height: 1; color: #f0d68a; font-variant-numeric: tabular-nums; min-height: 1em; }
.rt-op.start { color: #f0f4fa; } .rt-op.ask { color: #8a96a8; } .rt-op.good { color: #3ddc84; } .rt-op.bad { color: #ff6b6b; }
.rt-step { font-size: 12px; font-weight: 700; color: #9aa3b2; min-height: 15px; margin-top: 4px; }
.rt-input { min-height: 38px; font-size: 28px; font-weight: 800; color: #f0f4fa; font-variant-numeric: tabular-nums; }
.rt-msg { min-height: 20px; max-height: 36px; overflow-y: auto; touch-action: pan-y; max-width: 360px; font-size: 12.5px; font-weight: 800; color: #f0f4fa; text-align: center; line-height: 1.4; }
.rt-msg.ok { color: #8fd0a0; } .rt-msg.warn { color: #f0d68a; }
.rt-pad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; width: 100%; max-width: 330px; }
.rt-key {
  height: clamp(42px, calc((100dvh - 470px) / 4), 58px); border: none; border-radius: 12px; background: #1c2431; color: #f0f4fa;
  font: inherit; font-size: 22px; font-weight: 800; cursor: pointer; -webkit-tap-highlight-color: transparent;
}
.rt-key:active { background: #2a3444; }
.rt-key:disabled { color: #6b7686; cursor: default; }
.rt-ok { background: #4f9eff; color: #0a0a0a; font-size: 18px; }
.rt-ok:disabled { background: #2a3140; color: #7d8796; }

.overlay-howto {
  margin: 0; font-size: 13px; line-height: 1.5; color: #c9c9c9;
  text-align: left; white-space: pre-line; max-height: 50vh;
  overflow-y: auto; touch-action: pan-y;
}
.overlay-sub { margin: 0; font-size: 13px; color: #a0a0a0; }
/* 오답 피드백 동안은 입력 줄을 접고 그 자리까지 사슬 풀이에 쓴다 — 두 줄로는 11단계 사슬이 잘렸다 */
.rt-wrap.fb .rt-input { display: none; }
.rt-wrap.fb .rt-msg { max-height: 76px; }