:root {
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', ui-monospace, Menlo, Monaco, 'Cascadia Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.08), 0 4px 6px -4px rgba(15, 23, 42, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

[data-theme="light"] {
  --color-primary: #4f46e5;
  --color-primary-light: #6366f1;
  --color-primary-dark: #4338ca;
  --color-primary-soft: #eef2ff;

  --color-income: #059669;
  --color-income-soft: #ecfdf5;
  --color-expense: #dc2626;
  --color-expense-soft: #fef2f2;
  --color-transfer: #3b82f6;
  --color-transfer-soft: #eff6ff;

  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-border: #e2e8f0;
  --color-border-subtle: #f1f5f9;

  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-text-inverse: #ffffff;

  --header-bg: rgba(255, 255, 255, 0.8);
  --header-border: rgba(226, 232, 240, 0.8);
  --sidebar-bg: #ffffff;
  --bottom-nav-bg: rgba(255, 255, 255, 0.92);

  --overlay: rgba(15, 23, 42, 0.4);
}

[data-theme="dark"] {
  --color-primary: #818cf8;
  --color-primary-light: #a5b4fc;
  --color-primary-dark: #6366f1;
  --color-primary-soft: #1e1b4b;

  --color-income: #34d399;
  --color-income-soft: #064e3b;
  --color-expense: #f87171;
  --color-expense-soft: #450a0a;
  --color-transfer: #60a5fa;
  --color-transfer-soft: #172554;

  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-elevated: #334155;
  --color-border: #334155;
  --color-border-subtle: #1e293b;

  --color-text: #f8fafc;
  --color-text-secondary: #cbd5e1;
  --color-text-muted: #94a3b8;
  --color-text-inverse: #0f172a;

  --header-bg: rgba(15, 23, 42, 0.8);
  --header-border: rgba(51, 65, 85, 0.8);
  --sidebar-bg: #1e293b;
  --bottom-nav-bg: rgba(15, 23, 42, 0.92);

  --overlay: rgba(0, 0, 0, 0.5);
}