* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
}

body {
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  color: #e0f7fa;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}

.container {
  text-align: center;
  animation: fadeIn 1s ease-in-out;
}

h1 {
  font-size: 2.5rem;
  color: #00f7ff;
}

.subtitle {
  margin-top: 0.3rem;
  font-size: 1rem;
  color: #c0cfd6;
}

.card {
  margin-top: 2rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 1rem;
  padding: 2rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

label {
  font-size: 0.9rem;
  display: block;
  text-align: left;
  margin: 0.3rem 0;
}

input[type="range"] {
  width: 100%;
  margin-top: 0.5rem;
}

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem;
}

button {
  padding: 0.75rem 1.2rem;
  background-color: #00f7ff;
  color: #000;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

button:hover {
  background-color: #0ff;
  transform: scale(1.05);
}

.output {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

.output input {
  flex: 1;
  padding: 0.7rem;
  background-color: #121c24;
  border: 1px solid #00f7ff66;
  color: #0ff;
  border-radius: 6px;
  font-size: 1rem;
  min-width: 200px;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 500px) {
  h1 {
    font-size: 2rem;
  }

  .output {
    flex-direction: column;
  }

  .options {
    grid-template-columns: 1fr;
  }
}