/* Light theme — default */
:root,
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94a3b8;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-primary-text: #ffffff;

  --color-accent: #7c3aed;
  --color-accent-light: #ede9fe;

  --color-success: #16a34a;
  --color-error: #dc2626;
  --color-error-bg: #fef2f2;

  --color-calc-btn: #f1f5f9;
  --color-calc-btn-hover: #e2e8f0;
  --color-calc-btn-active: #cbd5e1;
  --color-calc-btn-operator: #dbeafe;
  --color-calc-btn-function: #ede9fe;
  --color-calc-btn-equals: #2563eb;
  --color-calc-btn-equals-text: #ffffff;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
}