* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #111827;
  color: #f9fafb;
}

button {
  cursor: pointer;
  border: 0;
  border-radius: 10px;
  padding: 10px 12px;
  font-weight: 700;
}

button:hover {
  filter: brightness(1.06);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.topbar h1 {
  margin: 0;
  font-size: 28px;
}

.subtitle {
  margin: 6px 0 0;
  color: #cbd5e1;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 20px;
}

.board-panel,
.card {
  background: #1f2937;
  border: 1px solid #374151;
  border-radius: 16px;
  padding: 16px;
}

.board {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
  width: min(90vw, 700px);
  aspect-ratio: 1 / 1;
  margin: 0 auto;
}

.cell {
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  user-select: none;
}

.cell.scanned {
  box-shadow: inset 0 0 0 2px #22c55e;
}

.cell.hit {
  box-shadow: inset 0 0 0 2px #ef4444;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card h2 {
  margin-top: 0;
  font-size: 20px;
}

.stats {
  display: grid;
  gap: 8px;
}

.queue {
  min-height: 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.queue-item {
  background: #334155;
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 14px;
}

.button-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.action-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.secondary {
  background: #475569;
  color: #fff;
}

.log {
  background: #0f172a;
  border-radius: 12px;
  padding: 10px;
  height: 240px;
  overflow-y: auto;
  font-size: 14px;
  line-height: 1.4;
}

.log-entry {
  margin-bottom: 8px;
  border-bottom: 1px solid #1e293b;
  padding-bottom: 8px;
}

.small-note {
  color: #cbd5e1;
  font-size: 13px;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .board {
    width: 100%;
  }
}