/* ============================================
   BASE.CSS - CSS Reset & Global Defaults
   Loads after tokens.css
   ============================================ */

/* ============================================
   RESET - Minimal, opinionated
   ============================================ */

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

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

/* Prevent font size inflation on mobile */
html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
}

/* Smooth scrolling for anchors */
html:focus-within {
  scroll-behavior: smooth;
}

/* Body defaults */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-neutral-800);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: -0.011em;
}

/* Media defaults */
img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Remove built-in form typography */
input, button, textarea, select {
  font: inherit;
}

/* Remove textarea resize except vertical */
textarea {
  resize: vertical;
}

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

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

/* Remove animations for 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;
  }
}

/* ============================================
   FOCUS STATES - Accessible & Consistent
   ============================================ */

/* Remove default focus outline */
:focus {
  outline: none;
}

/* Keyboard focus visible - consistent ring */
:focus-visible {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Focus within for form groups */
.input:focus,
.textarea:focus,
.select:focus,
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: 0 0 0 3px var(--color-primary-100);
}

/* ============================================
   SELECTION - Branded highlight
   ============================================ */

::selection {
  background: var(--color-primary-100);
  color: var(--color-primary-900);
}

/* ============================================
   SCROLLBAR - Minimal, consistent
   ============================================ */

/* Webkit browsers */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-neutral-100);
}

::-webkit-scrollbar-thumb {
  background: var(--color-neutral-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral-400);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-neutral-300) var(--color-neutral-100);
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

/* Container - centered, max-width, responsive padding */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-left: auto;
  margin-right: auto;
  padding-left: 4%;
  padding-right: 4%;
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }

@media (max-width: 768px) {
  .container {
    padding-left: 3%;
    padding-right: 3%;
  }
}

/* Stack - vertical spacing */
.stack {
  display: flex;
  flex-direction: column;
}

.stack > * + * {
  margin-top: var(--space-4);
}

.stack-xs > * + * { margin-top: var(--space-1); }
.stack-sm > * + * { margin-top: var(--space-2); }
.stack-md > * + * { margin-top: var(--space-4); }
.stack-lg > * + * { margin-top: var(--space-6); }
.stack-xl > * + * { margin-top: var(--space-8); }

/* Row - horizontal layout with gap */
.row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.row-sm { gap: var(--space-2); }
.row-lg { gap: var(--space-6); }
.row-xl { gap: var(--space-8); }

/* Center - flex center */
.center {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Between - space between */
.between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Divider */
.divider {
  height: 1px;
  background: var(--color-neutral-200);
  border: none;
  margin: var(--space-4) 0;
}

.divider-lg {
  margin: var(--space-8) 0;
}

/* ============================================
   VISIBILITY UTILITIES
   ============================================ */

/* 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;
}

/* Hidden */
.hidden {
  display: none !important;
}

/* Visible only on mobile */
@media (min-width: 769px) {
  .mobile-only {
    display: none !important;
  }
}

/* Visible only on desktop */
@media (max-width: 768px) {
  .desktop-only {
    display: none !important;
  }
}

/* ============================================
   SPACING UTILITIES
   ============================================ */

/* Margin utilities */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }
.mt-5 { margin-top: var(--space-5); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-5 { margin-bottom: var(--space-5); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* Padding utilities */
.p-0 { padding: 0; }
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-5 { padding: var(--space-5); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

/* Gap utilities */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }