/* ==========================================================================
   WebGrow — base
   Reset, page defaults, layout primitives and utilities shared by every page.
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  color-scheme: dark;
  scroll-padding-top: calc(var(--header-h) + 16px);
  interpolate-size: allow-keywords;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: var(--fs-body);
  line-height: 1.6;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

img, svg, picture { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
strong { font-weight: 600; }

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

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}
.on-paper :focus-visible { outline-color: var(--paper-ink); }

/* Skip link — invisible until it receives keyboard focus */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 12px 18px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus-visible { transform: none; outline-offset: 2px; }

/* Layout ------------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--col-gap);
}

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

/* Surfaces ---------------------------------------------------------------- */
.on-paper {
  background: var(--paper);
  color: var(--paper-ink);
  color-scheme: light;
}

/* Film grain overlay — use on 1–2 sections per page, never everywhere */
.grain { position: relative; isolation: isolate; }
.grain::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  border-radius: inherit;
  background-image: var(--grain);
  background-size: 180px 180px;
  opacity: 0.07;
  mix-blend-mode: soft-light;
}

/* Reveal utility — only hides content when motion is allowed and JS is on */
[data-reveal] {
  transition:
    opacity 0.9s var(--ease-emph) calc(var(--d, 0) * 90ms),
    transform 1.1s var(--ease-emph) calc(var(--d, 0) * 90ms);
}
.js-motion [data-reveal]:not(.is-in) {
  opacity: 0;
  transform: translate3d(0, 26px, 0);
}

@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;
  }
}