/* ============================================================
   base.css — element defaults, typography, a11y primitives
   ============================================================ */

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-base);
}

h1, h2, h3, h4 {
  color: var(--color-text-primary);
  font-weight: var(--fw-bold);
}

h1 {
  font-size: var(--fs-h1);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
}

h2 {
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: var(--ls-snug);
}

h3 {
  font-size: var(--fs-h3);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
}

h4 {
  font-size: var(--fs-h4);
  font-weight: var(--fw-semibold);
}

p {
  color: var(--color-text-secondary);
  line-height: var(--lh-loose);
}

a {
  color: var(--color-accent-primary);
  transition: color var(--t-base), opacity var(--t-base);
}

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

strong {
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
}

/* --- Focus -------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 3px;
  border-radius: 2px;
}

/* --- Skip link --------------------------------------------- */
.skip-link {
  position: absolute;
  top: -200%;
  left: 16px;
  z-index: var(--z-skip);
  background: var(--color-accent-primary);
  color: var(--color-bg-primary);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  transition: top var(--t-base);
}

.skip-link:focus {
  top: 16px;
  color: var(--color-bg-primary);
}

/* --- 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;
}

/* --- Reduced motion ---------------------------------------- */
@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;
  }
}