body {
  background-color: #0f172a;
  color: #e2e8f0;
  font-family: 'Segoe UI', sans-serif;
  display: flex;
  justify-content: center;
  padding: 40px;
}

.container {
  width: 90%;
  max-width: 800px;
  background-color: #1e293b;
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 0 10px #334155;
}

h1 {
  text-align: center;
  color: #7dd3fc;
  margin-bottom: 20px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  margin-bottom: 15px;
}

input, select {
  padding: 6px;
  border-radius: 5px;
  border: none;
  width: 180px;
}

button {
  padding: 6px 10px;
  border: none;
  background-color: #3b82f6;
  color: white;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #2563eb;
}

.info {
  text-align: center;
  margin-bottom: 20px;
}

.bars {
  display: flex;
  align-items: flex-end;
  height: 300px;
  gap: 4px;
  margin-top: 20px;
  background-color: #0f172a;
  padding: 10px;
}

.bar {
  background-color: #38bdf8;
  width: 20px;
  transition: height 0.3s ease;
}