/* Global Styles - Color Tokens, Typography, Base Reset */

:root {
  /* Color Palette - Dark teal/blue to warm orange/yellow gradient */
  --color-teal-dark: #0a4d5c;
  --color-teal: #1a7a8c;
  --color-teal-light: #2a9bb4;
  --color-blue: #3d8eb8;
  --color-orange-warm: #f4a460;
  --color-orange: #ff8c42;
  --color-yellow-warm: #ffb347;
  --color-yellow: #ffd700;
  
  /* Gradient stops for backgrounds */
  --gradient-start: var(--color-teal-dark);
  --gradient-mid: var(--color-orange-warm);
  --gradient-end: var(--color-yellow-warm);
  
  /* Neutral colors */
  --color-white: #ffffff;
  --color-black: #1a1a1a;
  --color-gray-light: #f5f5f5;
  --color-gray: #888888;
  --color-gray-dark: #444444;
  
  /* Overlay colors */
  --overlay-dark: rgba(0, 0, 0, 0.75);
  --overlay-light: rgba(255, 255, 255, 0.1);
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-family-heading: Georgia, 'Times New Roman', serif;
  
  --font-size-base: 16px;
  --font-size-small: 14px;
  --font-size-large: 18px;
  --font-size-xl: 24px;
  --font-size-xxl: 32px;
  --font-size-xxxl: 48px;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  
  --line-height-base: 1.6;
  --line-height-tight: 1.2;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  --spacing-xxxl: 4rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  --transition-slower: 0.8s ease-in-out;
  
  /* Z-index layers */
  --z-base: 1;
  --z-overlay: 100;
  --z-modal: 200;
  --z-ripple: 300;
}

/* Reset & Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-black);
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-mid) 50%, var(--gradient-end) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Improve performance */
  will-change: scroll-position;
}

/* Respect reduced motion preference */
@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;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-xxxl);
}

h2 {
  font-size: var(--font-size-xxl);
}

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

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

a:hover,
a:focus {
  opacity: 0.8;
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

/* Button Styles */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
  background-color: var(--color-teal);
  border: 2px solid var(--color-teal);
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
}

.btn:hover,
.btn:focus {
  background-color: var(--color-teal-light);
  border-color: var(--color-teal-light);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn:active {
  transform: translateY(0);
}

.btn:focus {
  outline: 2px solid var(--color-yellow-warm);
  outline-offset: 2px;
}

/* Home Button */
.btn--home {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  z-index: var(--z-base);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-white);
  color: var(--color-teal-dark);
  border-color: var(--color-white);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn--home:hover,
.btn--home:focus {
  background-color: var(--color-gray-light);
  border-color: var(--color-gray-light);
  color: var(--color-teal-dark);
}

.btn--home.is-hidden {
  display: none;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-yellow-warm);
  outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-teal-dark);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: var(--z-modal);
  text-decoration: none;
  border-radius: 0 0 4px 0;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-yellow-warm);
  outline-offset: 2px;
}