/* Base styles */
body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f7fa;
  color: #222;
  line-height: 1.4;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

h1 {
  text-align: center;
  margin-bottom: 10px;
}

p {
  color: #555;
  margin-top: 0;
  margin-bottom: 30px;
  text-align: center;
}

/* Form styles */
.form-group {
  margin-bottom: 15px;
  display: flex;
  flex-direction: column;
}

.form-group label {
  margin-bottom: 4px;
  font-weight: bold;
}

.form-group input,
.form-group select {
  padding: 8px 10px;
  font-size: 16px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.form-group input:focus,
.form-group select:focus {
  border-color: #0078D4;
  outline: none;
  box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.2);
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.form-row .form-group {
  flex: 1 1 200px;
}

fieldset.fieldset {
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 15px;
  margin-bottom: 25px;
}

legend {
  font-weight: bold;
  padding: 0 10px;
  color: #333;
}

/* Button styles */
button#calculate-btn {
  padding: 12px 20px;
  font-size: 16px;
  color: #fff;
  background-color: #0078D4;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  width: 100%;
  transition: background-color 0.2s ease-in-out;
}

button#calculate-btn:hover {
  background-color: #005fa3;
}

/* Results styles */
#results {
  margin-top: 30px;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 20px;
  background-color: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

#results.hidden {
  display: none;
}

#results h2 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.4em;
}

#results .equation {
  font-family: 'Courier New', monospace;
  background-color: #f9f9f9;
  border-radius: 4px;
  padding: 5px 8px;
  display: inline-block;
  margin-bottom: 5px;
  color: #c7254e;
}

#results .result-row {
  margin-bottom: 15px;
}

#results .result-title {
  font-weight: bold;
  margin-bottom: 4px;
  display: block;
}

#results .result-value {
  color: #0078D4;
  font-size: 1.1em;
  margin-bottom: 4px;
}

#results .info-text {
  color: #555;
  font-size: 0.9em;
  margin-bottom: 10px;
}

@media screen and (max-width: 600px) {
  .form-row {
    flex-direction: column;
  }
  button#calculate-btn {
    width: 100%;
  }
}