/* Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Modern Responsive Styles for Unit Converter */
.container {
  max-width: 420px;
  width: 100%;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: #fff;
  border-radius: 1.25rem;
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.unit-section h1 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: #007bff;
  font-weight: 700;
}

.unit-section p {
  text-align: center;
  font-size: 1rem;
  color: #444;
  margin-bottom: 1.5rem;
  line-height: 1.6;
  padding: 0 1rem;
}


.form-group label {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: #333;
}

.unit-section input, .unit-section select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid #d0d7de;
  border-radius: 0.75rem;
  background: #f8fafc;
  margin-top: 0.25rem;
  transition: border 0.2s;
}

.unit-section input:focus, .unit-section select:focus {
  border-color: #007bff;
  outline: none;
}

.unit-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.unit-select {
  flex: 1 1 45%;
  display: flex;
  flex-direction: column;
}

.arrow {
  font-size: 1.5rem;
  color: #888;
  margin-top: 2rem;
}

.unit-section button {
  padding: 0.9rem 0;
  background: linear-gradient(90deg, #007bff 60%, #0056b3 100%);
  color: #fff;
  font-size: 1.1rem;
  font-weight: 600;
  border: none;
  border-radius: 0.75rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
  margin-top: 0.5rem;
}

.unit-section button:hover {
  background: linear-gradient(90deg, #0056b3 60%, #007bff 100%);
  transform: translateY(-2px) scale(1.02);
}

#result {
  text-align: center;
  font-size: 1.2rem;
  font-weight: bold;
  margin-top: 0.5rem;
  color: #2c3e50;
  word-break: break-word;
  min-height: 1.5em;
}

/* Responsive Design */
@media (max-width: 600px) {
  .container {
    max-width: 100%;
    padding: 0 0.5rem;
  }
  .card {
    padding: 1.2rem 0.5rem;
  }
  .unit-row {
    flex-direction: column;
    gap: 0.5rem;
  }
  .arrow {
    display: none;
  }
}

.unit-section {
  background: linear-gradient(to right, #dfe9f3, #ffffff);
  min-height: 80vh;
  padding: 2rem 0;
}