/**
 * United Polaris Menu Archive - Brand Color System
 * Based on United Airlines official brand guidelines
 * Last updated: 2026-01-02 - Fixed cookie banner button visibility
 */

:root {
  /* Official United Airlines Core Colors */
  --ua-blue: #1414D2;           /* United Blue (primary brand color) */
  --ua-dark-blue: #051464;      /* Dark Blue */
  --ua-black: #000000;          /* Black */
  --ua-white: #FFFFFF;          /* White */
  --ua-gray-light: #F7F4F2;     /* Light Tonal Gray */

  /* Polaris Menu Archive Color Palette */
  /* Selected from Coolors palette - blue-focused for United alignment */
  --polaris-navy-darkest: #00072d;   /* Prussian Blue - darkest backgrounds */
  --polaris-navy-dark: #001c55;      /* Deep Navy - dark sections */
  --polaris-navy: #0a2472;           /* Imperial Blue - primary navy */
  --polaris-blue: #0e6ba8;           /* Cornflower Ocean - interactive elements */
  --polaris-blue-light: #a6e1fa;     /* Frosted Blue - highlights */
  --polaris-blue-lighter: #c3e4ff;   /* Accessible light blue for footer links (WCAG AA compliant on #00072d) */

  /* Semantic Color Assignments */
  --color-primary: var(--polaris-navy);
  --color-primary-dark: var(--polaris-navy-dark);
  --color-primary-light: var(--polaris-blue);
  --color-accent: var(--polaris-blue-light);

  --color-background: var(--ua-white);
  --color-background-alt: var(--ua-gray-light);
  --color-background-dark: var(--polaris-navy-darkest);

  --color-text-primary: #1a1a1a;
  --color-text-secondary: #666666;
  --color-text-inverse: var(--ua-white);

  --color-border: #e0e0e0;
  --color-border-light: #f0f0f0;

  /* Interactive States */
  --color-hover: var(--polaris-blue);
  --color-active: var(--polaris-navy-dark);
  --color-focus: var(--polaris-blue-light);

  /* Status Colors (maintaining accessibility) */
  --color-success: #2D4637;      /* Dark Green from UA palette */
  --color-warning: #696E28;      /* Yellow Green from UA palette */
  --color-error: #7D283C;        /* Dark Burgundy from UA palette */

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--polaris-navy) 0%, var(--polaris-blue) 100%);
  --gradient-hero: linear-gradient(135deg, var(--polaris-navy-dark) 0%, var(--polaris-blue) 100%);
  --gradient-subtle: linear-gradient(180deg, var(--ua-white) 0%, var(--ua-gray-light) 100%);

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 7, 45, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 7, 45, 0.1), 0 2px 4px -1px rgba(0, 7, 45, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 7, 45, 0.1), 0 4px 6px -2px rgba(0, 7, 45, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 7, 45, 0.1), 0 10px 10px -5px rgba(0, 7, 45, 0.04);

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Spacing System (based on 8px base) */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-24: 6rem;     /* 96px */

  /* Typography */
  --font-family-primary: 'Noto Sans', Arial, sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
}

/* Dark Mode Support (optional for future) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: var(--polaris-navy-darkest);
    --color-background-alt: var(--polaris-navy-dark);
    --color-text-primary: var(--ua-white);
    --color-text-secondary: var(--polaris-blue-light);
  }
}

/* Utility Classes */
.bg-primary { background-color: var(--color-primary); }
.bg-primary-light { background-color: var(--color-primary-light); }
.bg-gradient-primary { background: var(--gradient-primary); }
.bg-gradient-hero { background: var(--gradient-hero); }

/* United Brand Color Utilities */
.bg-ua-blue { background-color: var(--ua-blue); }
.bg-ua-blue-dark { background-color: var(--ua-dark-blue); }
.hover\:bg-ua-blue-dark:hover { background-color: var(--ua-dark-blue); }

.text-primary { color: var(--color-text-primary); }
.text-inverse { color: var(--color-text-inverse); }
.text-accent { color: var(--polaris-blue); }

.border-primary { border-color: var(--color-border); }

.shadow-card { box-shadow: var(--shadow-md); }
.shadow-hover { box-shadow: var(--shadow-lg); }

/* ============================= */
/* Accessibility Utilities       */
/* ============================= */

/* Screen Reader Only - hides content visually but keeps it for screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Show on focus - for skip links */
.sr-only:focus,
.sr-only:active {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 9999;
  width: auto;
  height: auto;
  padding: 0.75rem 1.5rem;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
  background-color: var(--polaris-blue);
  color: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  font-weight: var(--font-semibold);
}

/* Enhanced Focus Indicators (WCAG 2.4.7) */
*:focus {
  outline: 3px solid var(--polaris-blue-light);
  outline-offset: 2px;
}

/* Focus styles for dark backgrounds */
.hero-gradient *:focus,
footer *:focus,
[class*="bg-black"] *:focus,
[class*="bg-gray-9"] *:focus {
  outline-color: var(--polaris-blue-lighter);
}

/* Inputs already have custom focus styles, keep those */
input:focus,
textarea:focus,
select:focus,
button:focus {
  outline: none; /* Custom ring styles in place */
}

/* Ensure minimum touch target sizes (WCAG 2.5.5) */
.touch-target {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Reduced Motion Support (WCAG 2.3.3) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}