* {
  box-sizing: border-box;
}

:root {
  --cell-size: 34px;
  --cell-gap: 4px;
  --blue: #2563eb;
  --slate-950: #020617;
  --slate-900: #0f172a;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --white-soft: rgba(255, 255, 255, 0.86);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, #dbeafe, transparent 30%),
    radial-gradient(circle at bottom right, #dcfce7, transparent 28%),
    linear-gradient(135deg, #f8fafc, #e0f2fe);
  color: var(--slate-900);
  display: flex;
  justify-content: center;
  padding: 24px;
}

.app {
  width: min(100%, 1280px);
}

.panel {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 16px 20px;
  margin-bottom: 12px;
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 24px;
  background: var(--white-soft);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(16px);
}

.panel > div:first-child {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.1;
}

p {
  margin: 0;
  color: var(--slate-500);
}

.controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

select,
button {
  height: 40px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  padding: 0 12px;
  font-size: 14px;
  background: white;
  color: var(--slate-900);
}

button {
  cursor: pointer;
  border: none;
  background: var(--blue);
  color: white;
  font-weight: 700;
}

button:hover {
  background: #1d4ed8;
}

.status {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.status-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.status-item span {
  font-size: 14px;
  color: var(--slate-500);
}

.status-item strong {
  font-size: 26px;
  line-height: 1;
  color: var(--slate-900);
}

.face {
  width: 58px;
  height: 58px;
  border-radius: 18px;
  background: white;
  display: grid;
  place-items: center;
  font-size: 30px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  user-select: none;
}

.face:hover {
  background: #f8fafc;
}

.board-wrap {
  overflow: auto;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(16px);
}

.board {
  display: grid;
  gap: var(--cell-gap);
  width: max-content;
  margin: 0 auto;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border: 0;
  border-radius: 9px;
  padding: 0;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 16px;
  background: linear-gradient(145deg, #cbd5e1, #f8fafc);
  color: var(--slate-900);
  box-shadow:
    inset 0 -2px 0 rgba(15, 23, 42, 0.18),
    0 2px 6px rgba(15, 23, 42, 0.12);
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
}

.cell:hover {
  filter: brightness(1.04);
}

.cell.revealed {
  background: var(--slate-100);
  box-shadow: inset 0 0 0 1px #dbe2ea;
  cursor: default;
}

.cell.flagged {
  background: linear-gradient(145deg, #fde68a, #facc15);
}

.cell.mine {
  background: #ef4444;
  color: white;
}

.cell.wrong-flag {
  background: #fb7185;
  color: white;
}

.cell.n1 { color: #2563eb; }
.cell.n2 { color: #16a34a; }
.cell.n3 { color: #dc2626; }
.cell.n4 { color: #7c3aed; }
.cell.n5 { color: #b45309; }
.cell.n6 { color: #0891b2; }
.cell.n7 { color: #334155; }
.cell.n8 { color: #111827; }

.tip {
  margin-top: 16px;
  padding: 14px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.8);
}

@media (max-width: 640px) {
  :root {
    --cell-size: 30px;
    --cell-gap: 4px;
  }

  body {
    padding: 14px;
  }

  .panel {
    align-items: stretch;
    flex-direction: column;
  }

  .controls {
    justify-content: stretch;
  }

  select,
  .controls button {
    width: 100%;
  }

  .cell {
    border-radius: 8px;
    font-size: 14px;
  }
}