.crc-calculator {
  background: #fff;
  padding: 20px;
  border-radius: 10px;
  max-width: 800px;
  margin: 20px auto;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.crc-calculator h2 {
  margin-bottom: 15px;
  text-align: center;
}
.crc-row {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}
.crc-row input, .crc-section select {
  flex: 1;
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 6px;
}
.crc-btn {
  width: 100%;
  padding: 12px;
  background: #0077ff;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
}
.crc-btn:hover { background: #005fcc; }
.crc-result {
  display: none;
  margin-top: 15px;
  background: #f1f8ff;
  padding: 15px;
  border: 1px solid #0077ff;
  border-radius: 6px;
  font-size: 18px;
}