#converterContainer {
  max-width: 900px;
  margin: 40px auto; 
  padding: 2rem;
  border-radius: 12px;
  background: linear-gradient(135deg, #fefefe, #f8f8f8);
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.15);
  font-family: "Open Sans", Arial, sans-serif;
  transition: background 0.4s ease;
}

#title {
  text-align: center;
  margin: 0 0 1.5rem;
  font-size: 2rem;
  letter-spacing: 1px;
  color: #333;
}

/* Grid of input fields */
.fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
}

.field-group {
  display: flex;
  flex-direction: column;
  margin: 0.5rem 0;
}

.field-group label {
  font-weight: 600;
  margin-bottom: 0.4rem;
  font-size: 0.95rem;
  color: #444;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.field-group input {
  padding: 0.65rem 0.75rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field-group input::placeholder {
  color: #bbb;
}
.field-group input:hover {
  border-color: #999;
}
.field-group input:focus {
  border-color: #666;
  box-shadow: 0 0 0 2px rgba(150, 150, 150, 0.2);
}

/* Footer text */
.footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.9rem;
  color: #888;
}

/* Responsiveness for smaller devices */
@media (max-width: 600px) {
  #converterContainer {
    margin: 20px auto;
    padding: 1.5rem;
  }
  #title {
    font-size: 1.6rem;
    margin-bottom: 1rem;
  }
}