:root {
  /* ============================================================
   * Palette
   * Generic colour scales. Component CSS should prefer semantic
   * tokens (below) over these raw values.
   * ============================================================ */

  /* Gray */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;

  /* Red (brand red at 700) */
  --color-red-50: #fef2f2;
  --color-red-100: #fee2e2;
  --color-red-200: #fecaca;
  --color-red-300: #fca5a5;
  --color-red-400: #f87171;
  --color-red-500: #ef4444;
  --color-red-600: #dc2626;
  --color-red-700: #c5131b; /* brand */
  --color-red-800: #9c1718;
  --color-red-900: #7f1316;

  /* Green */
  --color-green-50: #f0fdf4;
  --color-green-100: #dcfce7;
  --color-green-500: #10b981;
  --color-green-600: #059669;
  --color-green-700: #15803d;

  /* Blue */
  --color-blue-50: #eff6ff;
  --color-blue-100: #dbeafe;
  --color-blue-500: #3b82f6;
  --color-blue-700: #1e40af;

  /* Amber (replaces previous yellow/orange hybrid) */
  --color-amber-50: #fffbeb;
  --color-amber-100: #fef3c7;
  --color-amber-500: #f59e0b;
  --color-amber-600: #d97706;
  --color-amber-700: #b45309;
  --color-amber-900: #78350f;

  /* Pure */
  --white: #ffffff;
  --black: #000000;

  /* ============================================================
   * Semantic colour tokens
   * ============================================================ */

  /* Brand / primary */
  --primary: var(--color-red-700);
  --primary-dark: var(--color-red-800);
  --primary-light: #d41a22;
  --primary-lighter: rgba(197, 19, 27, 0.1);

  /* Secondary */
  --secondary: #5a6c7d;
  --secondary-dark: #3e4c59;
  --secondary-light: #7a8c9d;
  --secondary-lighter: var(--color-gray-50);

  /* Status */
  --success: var(--color-green-500);
  --success-dark: var(--color-green-600);
  --success-surface: var(--color-green-50);

  --warning: var(--color-amber-500);
  --warning-dark: var(--color-amber-600);
  --warning-surface: var(--color-amber-50);

  --error: var(--color-red-500);
  --error-dark: var(--color-red-700);
  --error-surface: var(--color-red-50);

  /* Danger is an alias of error — pick either at call sites. */
  --danger: var(--error);
  --danger-dark: var(--error-dark);
  --danger-surface: var(--error-surface);

  --info: var(--color-blue-500);
  --info-surface: var(--color-blue-50);

  /* Text */
  --text-primary: #333333;
  --text-secondary: #4f5979;
  --text-tertiary: #959baf;
  --text-on-primary: var(--white);

  /* Surfaces */
  --body-bg: #f5f6fa;
  --surface-bg: var(--white);
  --surface-bg-alt: var(--color-gray-50);
  --surface-bg-hover: var(--color-gray-50);

  /* Borders */
  --border-primary: #959baf;
  --border-secondary: #e4e9f3;
  --border-color: var(--border-secondary); /* default border */

  /* ============================================================
   * Border radius
   * ============================================================ */
  --border-radius-xs: 2px;
  --border-radius-sm: 4px;
  --border-radius-md: 6px;
  --border-radius-lg: 10px;
  --border-radius-xl: 15px;
  --border-radius-full: 9999px;
  --border-radius: var(--border-radius-md); /* default */

  /* ============================================================
   * Spacing — single 4px-based scale
   * Number = multiple of 4px (e.g. --space-4 = 16px).
   * ============================================================ */
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;

  /* ============================================================
   * Shadows
   * ============================================================ */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 0 11px 0 rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* ============================================================
   * Typography
   * ============================================================ */
  --font-family-base: 'Gotham', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  --letter-spacing: -0.03em;

  --font-size-xs: 0.5625rem;    /* 9px */
  --font-size-sm: 0.6875rem;    /* 11px */
  --font-size-base: 0.8125rem;  /* 13px */
  --font-size-lg: 0.9375rem;    /* 15px */
  --font-size-xl: 1.0625rem;    /* 17px */
  --font-size-2xl: 1.1875rem;   /* 19px */
  --font-size-3xl: 1.4375rem;   /* 23px */
  --font-size-4xl: 1.8125rem;   /* 29px */

  /* Font weights — values reflect the weights actually cut for
   * this design system (light-dominant). Names match the numeric
   * value, not the visual impression. */
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* ============================================================
   * Z-index
   * ============================================================ */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;

  /* ============================================================
   * Transitions
   * ============================================================ */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;

  /* ============================================================
   * Components — Buttons
   * ============================================================ */
  --btn-primary-text-color: var(--white);
  --btn-primary-bg-color: var(--primary);
  --btn-primary-border-color: transparent;
  --btn-primary-text-color-on: var(--white);
  --btn-primary-bg-color-on: var(--primary-light);
  --btn-primary-border-color-on: transparent;

  --btn-secondary-text-color: var(--black);
  --btn-secondary-bg-color: #e4e9f3;
  --btn-secondary-border-color: transparent;
  --btn-secondary-text-color-on: var(--black);
  --btn-secondary-bg-color-on: #ecf0f6;
  --btn-secondary-border-color-on: transparent;

  --btn-tertiary-text-color: var(--primary);
  --btn-tertiary-bg-color: var(--white);
  --btn-tertiary-border-color: #e4e9f3;
  --btn-tertiary-text-color-on: var(--primary-light);
  --btn-tertiary-bg-color-on: var(--white);
  --btn-tertiary-border-color-on: var(--primary);

  --btn-success-text-color: var(--white);
  --btn-success-bg-color: var(--success);
  --btn-success-border-color: transparent;
  --btn-success-text-color-on: var(--white);
  --btn-success-bg-color-on: var(--success-dark);
  --btn-success-border-color-on: transparent;

  --btn-warning-text-color: var(--white);
  --btn-warning-bg-color: var(--warning);
  --btn-warning-border-color: transparent;
  --btn-warning-text-color-on: var(--white);
  --btn-warning-bg-color-on: var(--warning-dark);
  --btn-warning-border-color-on: transparent;

  --btn-danger-text-color: var(--white);
  --btn-danger-bg-color: var(--danger);
  --btn-danger-border-color: transparent;
  --btn-danger-text-color-on: var(--white);
  --btn-danger-bg-color-on: var(--danger-dark);
  --btn-danger-border-color-on: transparent;

  /* ============================================================
   * Components — Forms
   * ============================================================ */
  --form-input-border-color: #e4e9f3;
  --form-input-bg-color: var(--white);
  --form-input-disabled-bg-color: #fafafa;
  --form-input-text-color: var(--text-primary);
  --form-input-placeholder-color: var(--text-tertiary);
  --form-input-focus-border-color: var(--text-tertiary);
}