/* ==========================================================================
   Base — reset, typography, layout primitives
   ========================================================================== */
*,
*::before,
*::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
h1, h2, h3, h4, p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
:focus-visible { outline: none; box-shadow: var(--shadow-focus); border-radius: var(--r-sm); }
::selection { background: var(--accent-tint); }

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

.section { padding-block: var(--s-9); }
.section--tight { padding-block: var(--s-8); }
.section--alt { background: var(--surface); border-block: 1px solid var(--line); }
.section--blueprint {
  background-color: var(--surface);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  border-block: 1px solid var(--line);
}

.mono { font-family: var(--font-mono); }
.muted { color: var(--muted); }
.lead { font-size: var(--fs-md); color: var(--ink-2); max-width: 62ch; }
.prose p + p { margin-top: var(--s-4); }
.prose { color: var(--ink-2); max-width: 68ch; }

.grid { display: grid; gap: var(--s-5); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stack > * + * { margin-top: var(--s-4); }
.row { display: flex; align-items: center; gap: var(--s-3); flex-wrap: wrap; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .section { padding-block: var(--s-8); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .section { padding-block: var(--s-7); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
}

/* Reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}