:root {
  /* 亲自然色盘 */
  --bg-sand: #f4f5f0;          /* 纸纤维/沙土感背景 */
  --surface-leaf: #e8efe6;     /* 浅叶绿表面 */
  --primary-moss: #3e5a47;     /* 苔藓深绿 */
  --primary-leaf: #728c69;     /* 鲜活叶绿 */
  --text-dark: #1f2b24;        /* 墨绿/黑 */
  --text-muted: #5c6b61;
  
  /* 渐变与光影 */
  --gradient-bg: radial-gradient(circle at top right, #e8efe6 0%, #f4f5f0 70%);
  --gradient-circle: linear-gradient(135deg, #81a476 0%, #4a6c55 100%);
  --shadow-soft: 0 12px 40px rgba(62, 90, 71, 0.08);
  --shadow-inner: inset 0 0 20px rgba(0, 0, 0, 0.05);
}