/* ==========================================================================
   BASE STYLES
   ========================================================================== */

/* CSS Variables */
:root {
  /* Brand Colors */
  --primary: #08264D;
  --secondary: #000000;
  --accent: #0F4C75;
  --accent-light: #3282B8;
  --bg-light: #F8F9FA;
  --bg-white: #FFFFFF;
  --text-dark: #212529;
  --text-light: #6C757D;
  --text-muted: #ADB5BD;
  --border-light: #E9ECEF;
  --border-medium: #DEE2E6;
  
  /* Success/Error Colors */
  --success: #28A745;
  --error: #DC3545;
  --warning: #FFC107;
  --info: #17A2B8;
  
  /* Typography */
  --font-sans: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Merriweather', Georgia, serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;
  
  /* Font Weights */
  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  
  /* Font Sizes */
  --fs-xs: 0.75rem;      /* 12px */
  --fs-sm: 0.875rem;     /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-lg: 1.125rem;     /* 18px */
  --fs-xl: 1.25rem;      /* 20px */
  --fs-2xl: 1.5rem;      /* 24px */
  --fs-3xl: 1.875rem;    /* 30px */
  --fs-4xl: 2.25rem;     /* 36px */
  --fs-5xl: 3rem;        /* 48px */
  --fs-6xl: 3.75rem;     /* 60px */
  
  /* Line Heights */
  --lh-tight: 1.25;
  --lh-normal: 1.5;
  --lh-relaxed: 1.75;
  
  /* Spacing */
  --space-xs: 0.5rem;    /* 8px */
  --space-sm: 0.75rem;   /* 12px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  --space-4xl: 5rem;     /* 80px */
  --space-5xl: 6rem;     /* 96px */
  
  /* Borders */
  --border-radius: 0.375rem;
  --border-radius-sm: 0.25rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  --border-radius-2xl: 1rem;
  --border-radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --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);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
  
  /* Breakpoints */
  --bp-sm: 640px;
  --bp-md: 768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
  --bp-2xl: 1536px;
}

/* ==========================================================================
   RESET & NORMALIZE
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 100%;
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--text-dark);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Remove default styling */
ul,
ol {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
  background-color: transparent;
}

button,
input,
optgroup,
select,
textarea {
  font-family: inherit;
  font-size: 100%;
  line-height: 1.15;
  margin: 0;
}

button,
[type="button"],
[type="reset"],
[type="submit"] {
  -webkit-appearance: button;
  cursor: pointer;
}

button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

fieldset {
  padding: 0.35em 0.75em 0.625em;
  border: 1px solid var(--border-medium);
  margin: 0 2px;
}

legend {
  box-sizing: border-box;
  color: inherit;
  display: table;
  max-width: 100%;
  padding: 0;
  white-space: normal;
}

img,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--text-dark);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--fs-4xl);
}

h2 {
  font-size: var(--fs-3xl);
}

h3 {
  font-size: var(--fs-2xl);
}

h4 {
  font-size: var(--fs-xl);
}

h5 {
  font-size: var(--fs-lg);
}

h6 {
  font-size: var(--fs-base);
}

p {
  margin-bottom: var(--space-md);
  line-height: var(--lh-relaxed);
}

.text-large {
  font-size: var(--fs-lg);
}

.text-small {
  font-size: var(--fs-sm);
}

.text-xs {
  font-size: var(--fs-xs);
}

.text-muted {
  color: var(--text-muted);
}

.text-light {
  color: var(--text-light);
}

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

.text-secondary {
  color: var(--secondary);
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.font-medium {
  font-weight: var(--fw-medium);
}

.font-semibold {
  font-weight: var(--fw-semibold);
}

.font-bold {
  font-weight: var(--fw-bold);
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */

/* Focus styles */
:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  border-radius: var(--border-radius);
  z-index: var(--z-tooltip);
}

.skip-link:focus {
  top: 6px;
}

/* Screen reader only */
.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;
}

/* ==========================================================================
   RESPONSIVE UTILITIES
   ========================================================================== */

@media (max-width: 767px) {
  h1 {
    font-size: var(--fs-3xl);
  }
  
  h2 {
    font-size: var(--fs-2xl);
  }
  
  h3 {
    font-size: var(--fs-xl);
  }
}