/* ============================================================
   BASE — Reset, global defaults, and utility helpers
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  min-height: 100vh;
  animation: page-enter 220ms ease-out both;
}

@keyframes page-enter {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

ul,
ol {
  list-style: none;
}

/* ---- Layout utilities ---- */
.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin-inline: auto;
  padding-inline: var(--space-8);
}

/* ---- Visibility ---- */
.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 ring ---- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body { animation: none; }
}

/* ---- Smooth section padding ---- */
section {
  padding-block: var(--space-32);
}

/* Let the browser skip layout and paint work for distant sections. */
main > section {
  content-visibility: auto;
  contain-intrinsic-size: auto 48rem;
}