: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)) 14px max(16px, env(safe-area-inset-bottom));
  gap: 12px;
}

/* 점수바 */
.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; }
.streak-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; }

.message { margin: 0; text-align: center; font-size: 14px; font-weight: 600; color: #c7c7d0; min-height: 18px; }

/* X / O 선택 */
.mark-picker { display: flex; gap: 10px; justify-content: center; }
.mark-btn {
  font: inherit; width: 64px; height: 52px; border-radius: 12px; cursor: pointer;
  font-size: 26px; font-weight: 800; line-height: 1;
  background: #17171f; border: 2px solid #2a2a34; color: #6b6b78;
  -webkit-tap-highlight-color: transparent; transition: all 0.12s ease;
  display: inline-flex; align-items: center; justify-content: center;
}
.mark-btn[data-mark="1"] { color: #6fb0ff; }
.mark-btn[data-mark="2"] { color: #ffc24d; }
.mark-btn.active { border-color: currentColor; background: #20202b; box-shadow: 0 0 0 3px rgba(255,255,255,0.05); transform: translateY(-1px); }

/* 보드 */
.board {
  display: grid; grid-template-columns: repeat(var(--n, 6), 1fr); gap: 5px;
  width: min(92vw, 62vh, 400px); aspect-ratio: 1; margin: 0 auto;
  padding: 8px; background: #14141c; border: 1px solid #24242e; border-radius: 14px;
}
.cell {
  background: #1d1d26; border-radius: 9px;
  display: flex; align-items: center; justify-content: center; position: relative;
  transition: background 0.1s ease;
}
.cell.legal { cursor: pointer; }
.cell.legal:active { background: #262633; }
.cell.last::before { content: ''; position: absolute; inset: 3px; border-radius: 7px; box-shadow: inset 0 0 0 2px rgba(255,255,255,0.22); }
.cell.win { background: #143026; box-shadow: inset 0 0 0 3px rgba(46,194,126,0.85); }

.mk { font-size: min(8vw, 34px); font-weight: 800; line-height: 1; }
.mk-x { color: #6fb0ff; }
.mk-o { color: #ffc24d; }

/* 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 */
.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: 52px; font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: -0.04em; line-height: 1; }
.overlay-score .unit { font-size: 18px; font-weight: 700; color: #a0a0a0; }
.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; }