:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --bg-cell: #2a2a3e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --warn: #ffaa44;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-md: 12px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 600px; height: 600px; overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  user-select: none;
  -webkit-user-select: none;
}

#app { width: 100%; height: 100%; position: relative; }

.screen {
  width: 100%; height: 100%;
  position: absolute; top: 0; left: 0;
  display: flex; flex-direction: column;
}

.screen.hidden { display: none; }

.focusable {
  transition: all 0.15s ease;
  border: 2px solid transparent;
  cursor: pointer;
  outline: none;
}

.focusable:focus {
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}

.hidden { display: none !important; }

.pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px;
  gap: 14px;
}

.title {
  font-size: 52px;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text-primary);
  text-align: center;
}

.title.win { color: var(--accent-secondary); }
.title.lose { color: var(--danger); }

.subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 360px;
}

.menu-btn {
  width: 100%;
  min-height: 72px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 12px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-family: inherit;
}

.btn-label {
  font-size: 22px;
  font-weight: 700;
}

.btn-sub {
  font-size: 14px;
  color: var(--text-secondary);
}

.hint {
  margin-top: 12px;
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
}

.best {
  font-size: 16px;
  color: var(--accent);
}

.game-header {
  height: 64px;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  border-bottom: 2px solid var(--bg-tertiary);
}

.stat {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 24px;
  font-weight: 700;
  min-width: 90px;
}

.stat-icon {
  color: var(--accent);
  font-size: 22px;
}

.stat:last-child .stat-icon { color: var(--warn); }

.stat-value { color: var(--text-primary); }

.stat-mode {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 6px 12px;
  border-radius: 8px;
  border: 2px solid transparent;
  transition: all 0.15s ease;
}

.stat-mode.flag {
  color: #000;
  background: var(--danger);
  border-color: var(--danger);
}

.grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  gap: 3px;
  padding: 8px;
  background: var(--bg-primary);
}

.cell {
  background: var(--bg-cell);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 800;
  color: var(--text-primary);
  border: 2px solid transparent;
  outline: none;
  cursor: pointer;
  transition: background 0.1s ease, box-shadow 0.1s ease, border-color 0.1s ease;
}

.cell:focus {
  border-color: var(--focus-ring);
  box-shadow: 0 0 14px var(--focus-glow);
  z-index: 2;
}

.cell.revealed {
  background: var(--bg-secondary);
}

.cell.flagged {
  color: var(--danger);
  background: var(--bg-tertiary);
}

.cell.mine {
  background: var(--danger);
  color: #fff;
}

.cell.mine-triggered {
  background: #ff1a4d;
  color: #fff;
  box-shadow: 0 0 18px rgba(255, 68, 102, 0.7);
}

.cell.n1 { color: #4dabff; }
.cell.n2 { color: #00ff88; }
.cell.n3 { color: #ff6688; }
.cell.n4 { color: #b078ff; }
.cell.n5 { color: #ffaa44; }
.cell.n6 { color: #00d4ff; }
.cell.n7 { color: #ffffff; }
.cell.n8 { color: #ff4466; }

.result-time {
  font-size: 56px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.result-sub {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 18px;
}