/* ==========================================================================
   BASE / RESET
   Minimal reset + element defaults. No component styling here.
   ========================================================================== */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  min-height: 100svh;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
}

img, picture, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul, ol {
  list-style: none;
  padding: 0;
}

h1, h2, h3, h4 {
  line-height: var(--lh-tight);
  font-weight: 600;
}

/* Visible, high-contrast focus ring everywhere — required for keyboard nav */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Screen-reader-only utility: content is present for AT but not sighted users */
.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;
}

/* Skip-to-content link: hidden until focused, first tab stop on the page */
.skip-link {
  position: absolute;
  top: -3rem;
  left: var(--space-4);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--dur-fast) var(--ease-out);
}

.skip-link:focus {
  top: var(--space-4);
}

::selection {
  background: var(--color-accent);
  color: var(--color-bg);
}