/* ohmmmm.com: the editorial context from DESIGN.md. Values live in these
   custom properties only; the rules below use them and nothing else.

   Page shell (see website/README.md for what goes where):
     .site-header  left rail, top: the ohm dot, linking home
     main          right column: the page itself (one <article>)
     .site-footer  left rail, bottom: the company directory (Contact, Support, Terms, Privacy)
   On narrow screens the three stack in source order: dot, page, directory. */
@font-face {
  font-family: "Coconat";
  src: url("/assets/fonts/coconat-regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;
  --ohm-font-serif: "Coconat", Georgia, "Times New Roman", serif;
  --ohm-font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;

  /* One ink, like a printed page: the Fatale forest green on warm paper. */
  --ohm-forest: #013220;
  --ohm-paper-editorial: #fafaf9;
  --ohm-ink-quiet: #4c6e61; /* forest at 70% on paper, 5.4:1 */
  --ohm-selection: rgb(161 214 174 / 0.42);

  /* One size for everything except the page title. Headings differ by weight. */
  --ohm-size: 16px;
  --ohm-leading: 1.65;
  --ohm-text: 400 var(--ohm-size)/var(--ohm-leading) var(--ohm-font-sans);
  --ohm-tracking: -0.015em;
  --ohm-strong: 600;
  --ohm-title: 400 clamp(40px, 6vw, 60px)/1.05 var(--ohm-font-serif); /* Coconat has one weight */
  --ohm-title-tracking: -0.02em;
  --ohm-title-gap: 28px;

  --ohm-measure: 620px;
  --ohm-gutter: 48px;
  --ohm-frame: 40px;
  --ohm-mark: 20px;
  --ohm-rail: 160px;
  --ohm-rail-gap: clamp(40px, 6vw, 96px);
  --ohm-paragraph: 1em;
  --ohm-section-gap: 2.5em;
  --ohm-subsection-gap: 1.75em;

  font-family: var(--ohm-font-sans);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  background: var(--ohm-paper-editorial);
  color: var(--ohm-forest);
}

* { box-sizing: border-box; }

::selection { background: var(--ohm-selection); }

body,
h1, h2, h3, p, ul, li {
  font: var(--ohm-text);
  letter-spacing: var(--ohm-tracking);
}

h1, h2, h3, p, ul { margin: 0; }

h2, h3 { font-weight: var(--ohm-strong); }

/* The page title: the one large thing on the page. */
h1 {
  font: var(--ohm-title);
  letter-spacing: var(--ohm-title-tracking);
}

a {
  color: inherit;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
  border-radius: 2px;
}

/* ---------- Shell ---------- */

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--ohm-frame);
  display: grid;
  grid-template-columns: var(--ohm-rail) minmax(0, var(--ohm-measure));
  grid-template-rows: 1fr auto;
  column-gap: var(--ohm-rail-gap);
}

.skip {
  position: absolute;
  left: var(--ohm-frame);
  top: 8px;
  transform: translateY(-200%);
}

.skip:focus { transform: none; }

.site-header {
  grid-column: 1;
  grid-row: 1;
  align-self: start;
}

main {
  grid-column: 2;
  grid-row: 1 / 3;
  padding-bottom: 80px;
}

.site-footer {
  grid-column: 1;
  grid-row: 2;
  align-self: end;
}

@media (min-width: 761px) and (min-height: 480px) {
  .site-header {
    position: sticky;
    top: var(--ohm-frame);
  }

  .site-footer {
    position: sticky;
    bottom: var(--ohm-frame);
  }
}

/* ---------- Rail ---------- */

.site-mark {
  display: block;
  width: var(--ohm-mark);
  height: var(--ohm-mark);
  /* centred on the first line of the page beside it */
  margin-top: calc((var(--ohm-size) * var(--ohm-leading) - var(--ohm-mark)) / 2);
  border-radius: 50%;
}

.site-mark img {
  display: block;
  width: 100%;
  height: 100%;
}

.site-footer ul {
  list-style: none;
  padding: 0;
}

.site-footer a {
  text-decoration: none;
}

.site-footer a:hover { text-decoration: underline; }

/* ---------- Main: the page ---------- */

.updated { color: var(--ohm-ink-quiet); }

/* Spacing is the only hierarchy: a line between paragraphs, more between sections. */
article > header > * + *,
section > * + * { margin-top: var(--ohm-paragraph); }

article > header > h1 + * { margin-top: var(--ohm-title-gap); }

section {
  margin-top: var(--ohm-section-gap);
  scroll-margin-top: var(--ohm-frame);
}

section > :is(p, ul) + h3 { margin-top: var(--ohm-subsection-gap); }

section p,
section li {
  text-wrap: pretty;
  overflow-wrap: break-word;
}

section ul { padding-left: 1.2em; }

section li + li { margin-top: 0.4em; }

/* ---------- Narrow screens: dot, page, directory ---------- */

@media (max-width: 760px) {
  body {
    display: block;
    padding: 28px calc(var(--ohm-gutter) / 2) 32px;
  }

  main { padding: 40px 0 56px; }

  .site-footer ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0 24px;
  }

  .site-footer a {
    display: inline-block;
    padding-block: 12px; /* 44px touch target */
  }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}