/* 數獨 — 黑金奢華。9×9 盤 + 數字鍵 + 難度選單。桌面/盤面絕不 3D 傾斜。 */
.gv-sudoku { display: flex; flex-direction: column; align-items: center; padding: 12px; }

/* ---- 大廳(選難度)---- */
.sk-lobby { width: 100%; max-width: 420px; display: flex; flex-direction: column; align-items: center; gap: 14px; padding: 8px 0 4px; }
.sk-lb-title { font-family: var(--font-display); font-size: 1.7rem; font-weight: 800; color: var(--gold-bright); letter-spacing: .06em; }
.sk-daily { font-size: .95rem; color: var(--gold); font-weight: 700; }
.sk-daily.out { color: var(--muted); }
.sk-pick { display: flex; flex-wrap: wrap; gap: 10px; width: 100%; }
.sk-pickbtn { min-width: 96px; }
.sk-pickbtn {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 16px 8px; border-radius: 14px; cursor: pointer;
  background: var(--panel); border: 1px solid var(--line);
  color: var(--ink); transition: transform .12s, border-color .12s, box-shadow .12s;
}
.sk-pickbtn:hover:not(:disabled) { transform: translateY(-2px); border-color: var(--gold); box-shadow: var(--glow-gold); }
.sk-pickbtn:disabled { opacity: .4; cursor: not-allowed; }
.sk-pickname { font-size: 1.1rem; font-weight: 800; color: var(--gold-bright); }
.sk-pickrw { font-size: .82rem; color: var(--muted); }
.sk-note { font-size: .8rem; color: var(--muted); text-align: center; line-height: 1.6; max-width: 360px; }

/* ---- 對局 ---- */
.sk-wrap { width: 100%; max-width: 460px; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.sk-head { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 0 4px; }
.sk-diff { font-weight: 700; color: var(--gold); }
.sk-timer { font-family: var(--font-display); font-size: 1.15rem; font-weight: 700; color: var(--gold-bright); letter-spacing: .04em; font-variant-numeric: tabular-nums; }

.sk-board {
  display: grid; grid-template-columns: repeat(9, 1fr); gap: 0;
  width: min(92vw, 440px); aspect-ratio: 1;
  background: var(--felt-dark);
  border: 2.5px solid var(--gold); border-radius: 10px; overflow: hidden;
  box-shadow: var(--shadow), inset 0 0 40px rgba(0,0,0,.5);
}
.sk-cell {
  display: flex; align-items: center; justify-content: center;
  font-size: clamp(1rem, 4.4vw, 1.5rem); font-weight: 600;
  color: var(--gold-bright);
  background: transparent; border: .5px solid var(--line-soft); cursor: pointer;
  aspect-ratio: 1; padding: 0; transition: background .1s;
  font-variant-numeric: tabular-nums;
}
.sk-cell.br { border-right: 2px solid var(--gold-deep); }
.sk-cell.bb { border-bottom: 2px solid var(--gold-deep); }
.sk-cell.given { color: var(--ink); font-weight: 800; background: rgba(255,255,255,.03); cursor: default; }
.sk-cell.same { background: rgba(212,175,55,.10); }
.sk-cell.sel { background: rgba(212,175,55,.28); box-shadow: inset 0 0 0 2px var(--gold-bright); }
.sk-cell.bad { color: var(--red); background: rgba(200,40,40,.18); }

.sk-pad { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; width: min(92vw, 440px); }
.sk-num {
  padding: 12px 0; border-radius: 10px; cursor: pointer;
  font-size: 1.25rem; font-weight: 700; color: var(--gold-bright);
  background: var(--panel); border: 1px solid var(--line);
  transition: transform .1s, border-color .1s, background .1s;
}
.sk-num:hover { transform: translateY(-1px); border-color: var(--gold); background: rgba(212,175,55,.12); }
.sk-num:active { transform: translateY(1px); }
.sk-erase { color: var(--muted); }

.sk-acts { display: flex; gap: 10px; width: min(92vw, 440px); }
.sk-submit { flex: 1; }
.sk-submit:disabled { opacity: .45; cursor: not-allowed; }