: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: 12px;
}

.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;
}

.round-val,
.time-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; }

#game {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.ks-board {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-template-rows: repeat(6, 1fr);
  width: min(100%, 52dvh);
  aspect-ratio: 1;
  background: #10131a;
  border: 2px solid #8c98ad;
  border-radius: 6px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.ks-board.done { box-shadow: 0 0 0 3px #6bd16b, 0 0 26px rgba(107, 209, 107, 0.5); }

.ks-cell {
  position: relative;
  background: #f3efe2;
  color: #17202e;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  /* 상자 경계(굵은 회색)를 기본으로 깔고, 케이지 경계는 아래 ::before로 덧그린다. */
  border: 1px solid #c9c3b2;
}

.ks-cell.bt { border-top-color: #8c98ad; border-top-width: 2px; }
.ks-cell.bb { border-bottom-color: #8c98ad; border-bottom-width: 2px; }
.ks-cell.bl { border-left-color: #8c98ad; border-left-width: 2px; }
.ks-cell.br { border-right-color: #8c98ad; border-right-width: 2px; }

/* 케이지 경계 — 칸 안쪽에 점선을 그린다. 셀 테두리를 쓰면 상자 경계와 겹쳐
   어느 쪽 선인지 구분이 안 된다. */
.ks-cell::before {
  content: '';
  position: absolute;
  inset: 3px;
  border: 0 dashed #3f6ea8;
  pointer-events: none;
}
.ks-cell.ct::before { border-top-width: 2px; }
.ks-cell.cr::before { border-right-width: 2px; }
.ks-cell.cb::before { border-bottom-width: 2px; }
.ks-cell.cl::before { border-left-width: 2px; }

/* 점선(inset 3px + 2px 두께) **안쪽**에 놓는다. 바깥에 두면 숫자 위로 점선이
   지나가 읽기 어렵다. */
.ks-sum {
  position: absolute;
  top: 6px;
  left: 8px;
  font-size: clamp(9px, 1.5dvh, 12px);
  font-weight: 800;
  color: #2b5b93;
  line-height: 1;
  z-index: 2;
}

.ks-val {
  font-size: clamp(20px, 4.2dvh, 32px);
  font-weight: 700;
  line-height: 1;
  position: relative;
  z-index: 1;
}

.ks-cell.sel { background: #bcd9ff; }
.ks-cell.bad .ks-val { color: #c92a2a; }
.ks-cell.bad { background: #ffdede; }
.ks-cell.sel.bad { background: #ffc9c9; }

.ks-pad {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  width: min(100%, 52dvh);
}

.ks-key {
  font: inherit;
  font-size: clamp(16px, 2.4dvh, 20px);
  font-weight: 800;
  color: #f5f5f5;
  background: #1c1c1c;
  border: 1px solid #2f2f2f;
  border-radius: 10px;
  min-height: 46px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.ks-key:active { background: #2a2a2a; }
.ks-key.ks-del { color: #ff9a9a; }

.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); }
}

.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: 48px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
  line-height: 1;
}

.overlay-meta { margin: -4px 0 4px; font-size: 14px; font-weight: 600; color: #a0a0a0; }

.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; }