/* ---------------------------------------------------------------------------
   base.css — reset, element defaults, layout primitives.
   Every rule reads from tokens.css. No colour or size literals below.
   --------------------------------------------------------------------------- */

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

* { margin: 0; }

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

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

/* --- Headings ------------------------------------------------------------ */

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--display-weight);
  letter-spacing: var(--display-tracking);
  line-height: var(--display-leading);
  text-wrap: balance;
}

h1 { font-size: var(--step-5); }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }

p, li { text-wrap: pretty; }

a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

/* --- Layout primitives --------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: var(--s-2xl); }
.section--alt { background: var(--bg-alt); }

/* Vertical rhythm without margin guesswork. */
.stack > * + * { margin-block-start: var(--stack-space, var(--s-s)); }
.stack-m > * + * { margin-block-start: var(--s-m); }
.stack-l > * + * { margin-block-start: var(--s-l); }

/* Horizontal group that wraps rather than overflows. */
.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--cluster-gap, var(--s-s));
  align-items: center;
}

/* Responsive column grid with no media queries. */
.grid {
  display: grid;
  gap: var(--grid-gap, var(--s-m));
  grid-template-columns: repeat(auto-fit, minmax(min(var(--grid-min, 260px), 100%), 1fr));
}

.grid--2 { --grid-min: 380px; }
.grid--fixed-2 { grid-template-columns: repeat(2, 1fr); }

/* Two-column split that collapses. */
.split {
  display: grid;
  gap: var(--s-xl);
  align-items: var(--split-align, center);
  grid-template-columns: repeat(auto-fit, minmax(min(420px, 100%), 1fr));
}

.prose { max-width: var(--measure); }

/* --- Small shared bits --------------------------------------------------- */

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

.lede {
  font-size: var(--step-1);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: var(--measure);
}

.muted { color: var(--ink-mute); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}

.skip-link {
  position: absolute; inset-inline-start: var(--s-s); inset-block-start: -100%;
  z-index: 100; padding: var(--s-2xs) var(--s-s);
  background: var(--ink); color: var(--bg); border-radius: var(--radius-s);
}
.skip-link:focus { inset-block-start: var(--s-s); }

hr { border: 0; border-block-start: 1px solid var(--line); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}