: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; }
.c6-wrap { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; min-height: 0; min-width: 0; padding: 0 6px; }
.c6-board {
  display: grid; grid-template-columns: repeat(15, 1fr); grid-template-rows: repeat(15, 1fr);
  width: min(100%, 420px); aspect-ratio: 1; background: #d9b56e; border-radius: 6px; padding: 2px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45); flex: 0 0 auto; box-sizing: border-box;
}
/* 교차점 하나 = 버튼 하나. 선은 ::before(가로)/::after(세로)로 그리고 판 끝에서 자른다 */
.c6-pt {
  position: relative; border: none; padding: 0; margin: 0; background: transparent; cursor: pointer;
  -webkit-tap-highlight-color: transparent; font: inherit;
}
.c6-pt::before, .c6-pt::after { content: ''; position: absolute; background: #5a4424; }
.c6-pt::before { left: 0; right: 0; top: 50%; height: 1px; }
.c6-pt::after { top: 0; bottom: 0; left: 50%; width: 1px; }
.c6-pt.l::before { left: 50%; } .c6-pt.r::before { right: 50%; }
.c6-pt.t::after { top: 50%; } .c6-pt.bt::after { bottom: 50%; }
.c6-pt.star { background: radial-gradient(circle, #5a4424 0 2.5px, transparent 3px); }
.c6-pt.black, .c6-pt.white, .c6-pt.ghost { z-index: 1; }
.c6-pt.black { background: radial-gradient(circle closest-side, #4a4a4a 0, #151515 55%, #000 84%, transparent 88%); }
.c6-pt.white { background: radial-gradient(circle closest-side, #fff 0, #eeeeee 50%, #c4c4c4 76%, #3c3c3c 82%, transparent 88%); }
.c6-pt.ghost { background: radial-gradient(circle closest-side, rgba(0,0,0,0.5) 0 62%, #0b4fb0 66% 84%, transparent 88%); }
.c6-pt.black::before, .c6-pt.black::after, .c6-pt.white::before, .c6-pt.white::after, .c6-pt.ghost::before, .c6-pt.ghost::after { display: none; }
/* 컴퓨터가 방금 둔 두 돌 · 이번 턴에 내가 둔 돌 · 이긴 줄 */
.c6-pt.last { box-shadow: inset 0 0 0 2px #b3131a; border-radius: 50%; }
.c6-pt.mine { box-shadow: inset 0 0 0 2px #0b4fb0; border-radius: 50%; }
.c6-pt.win { box-shadow: inset 0 0 0 3px #0b6a33; border-radius: 50%; }
.c6-status { flex: 0 0 auto; min-height: 20px; font-size: 14px; font-weight: 700; text-align: center; color: #f5f5f5; }
.c6-status.dim { color: #9aa3b2; }
.c6-status.warn { color: #ff8080; }

.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; }