:root {
  --primary-color: #1a365d; /* Modern Dark Blue */
  --primary-color-rgb: 26, 54, 93;
  --secondary-color: #C35817; /* Muted Copper / Terracotta for heating (Not garish) */
  --secondary-color-rgb: 195, 88, 23;
  --tertiary-color: #F4F7FB;
  --tertiary-color-rgb: 244, 247, 251;
}