* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  max-width: 780px;
  margin: 32px auto;
  padding: 0 16px;
  color: #111;
  text-align: center;
}

h1 { margin: 0 0 16px; }
.sub { margin: 18px 0 8px; font-size: 18px; color: #333; }

.controls {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.controls label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

button, input[type="number"], select {
  font-size: 16px;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid #ccc;
  background: #f9fafb;
  cursor: pointer;
}

button:hover { filter: brightness(0.97); }

#display {
  font-size: 72px;
  font-weight: 800;
  letter-spacing: 1px;
  margin: 18px 0 10px;
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.grid {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.grid-qualities {
  grid-template-columns: repeat(6, minmax(90px, 1fr));
}

.qual-btn {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 10px;
  background: #fff;
  font-weight: 700;
}

.qual-btn.active {
  background: #10b981;
  color: #fff;
  border-color: #10b981;
}

.quick-actions {
  margin-top: 10px;
  display: flex;
  gap: 10px;
  justify-content: center;
}

.hint {
  color: #555;
  margin-top: 12px;
  font-size: 14px;
}

.drone-controls {
  margin-top: 8px;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}