/**
 * CSS Reset and Base Styles
 * Modern CSS reset with base styles using design tokens
 * Validates: Requirements 2.1, 7.3
 */

/* ========================================
   MODERN CSS RESET
   ======================================== */

/* Box sizing rules */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Remove default margin and padding */
* {
  margin: 0;
  padding: 0;
}

/* Remove list styles on ul, ol elements with a list role */
ul[role='list'],
ol[role='list'] {
  list-style: none;
}

/* Set core root defaults */
html {
  scroll-behavior: smooth;
}

/* Set core body defaults */
html,
body {
  height: 100%;
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-neutral-900);
  background-color: var(--color-neutral-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Flexbox layout for sticky footer */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Main content should grow to push footer down */
main {
  flex: 1;
}

/* Make images easier to work with */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select {
  font: inherit;
}

/* Remove all animations, transitions and smooth scroll for people that prefer not to see them */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--color-neutral-900);
}

h1 {
  font-size: var(--text-5xl);
}

h2 {
  font-size: var(--text-4xl);
}

h3 {
  font-size: var(--text-3xl);
}

h4 {
  font-size: var(--text-2xl);
}

h5 {
  font-size: var(--text-xl);
}

h6 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--space-4);
}

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
}

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

/* Remove default button styles */
button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

/* Remove default fieldset styles */
fieldset {
  border: none;
}

/* Remove default legend styles */
legend {
  padding: 0;
}

/* Table reset */
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* Remove default blockquote styles */
blockquote {
  margin: 0;
}

/* Remove default address styles */
address {
  font-style: normal;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* 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-width: 0;
}

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary-600);
  color: white;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  z-index: 100;
}

.skip-to-main:focus {
  top: 0;
}