/* The house style for a landing page.
 *
 * One stylesheet, one set of tokens, one class vocabulary. A site that
 * invents its own names is a site the next person cannot restyle.
 *
 * The tokens are the ones in the house standard's DESIGN.md: warm ground,
 * warm ink, and three functional colours that only ever mean something.
 */

:root {
  --bg: #1d2021;
  --surface: #282828;
  --surface-deep: #3c3836;
  --fg: #ebdbb2;
  --muted: #a89984;
  --faint: #9d8e7f;
  --rule: #504945;
  --control: #928374;
  --ring: #ebdbb2;
  --ok: #b8bb26;
  --danger: #ff8a7a;
  --info: #83a598;

  --radius: 6px;
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap-md: 16px;
  --gap-lg: 24px;
  --gap-xl: 40px;

  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --wrap: 1080px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fbf1c7;
    --surface: #f2e5bc;
    --surface-deep: #ebdbb2;
    --fg: #3c3836;
    --muted: #665c54;
    --faint: #70635a;
    --rule: #d5c4a1;
    --control: #928374;
    --ring: #3c3836;
    --ok: #5f5f0e;
    --danger: #cc241d;
    --info: #076678;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  /* The header is sticky, so an anchor stops below it, not under it. */
  scroll-padding-top: calc(56px + var(--gap-md));
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

a {
  color: var(--fg);
  text-decoration-color: var(--faint);
  text-underline-offset: 3px;
}

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

:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: var(--radius);
}

code,
kbd,
pre,
.mono {
  font-family: var(--mono);
}

code {
  font-size: 0.9em;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 0.1em 0.35em;
}

pre {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: var(--gap-md);
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
}

pre code {
  background: none;
  border: 0;
  padding: 0;
  font-size: inherit;
}

kbd {
  display: inline-block;
  padding: 2px 6px;
  font-size: 0.78rem;
  line-height: 1.4;
  color: var(--fg);
  background: var(--surface-deep);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

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

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gap-lg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--surface);
  color: var(--fg);
  padding: var(--gap-sm) var(--gap-md);
  border-radius: 0 0 var(--radius) 0;
  z-index: 10;
}

.skip-link:focus {
  left: 0;
}

/* -- header -------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
  min-height: 56px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--gap-sm);
  font-family: var(--mono);
  font-weight: 700;
  text-decoration: none;
  color: var(--fg);
}

.brand-mark {
  width: 22px;
  height: 22px;
  flex: none;
}

.site-nav {
  display: flex;
  gap: var(--gap-md);
  margin-left: auto;
  font-size: 0.9rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--fg);
}

.header-github {
  font-size: 0.9rem;
  padding: var(--gap-xs) var(--gap-md);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--fg);
}

.header-github:hover {
  border-color: var(--fg);
}

@media (max-width: 720px) {
  .site-nav {
    display: none;
  }
}

/* -- hero ---------------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--gap-xl);
  align-items: center;
  padding-block: var(--gap-xl) var(--gap-lg);
}

.hero-copy h1 {
  margin: 0 0 var(--gap-md);
  font-size: clamp(1.9rem, 1.2rem + 2.4vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
}

.lede {
  margin: 0 0 var(--gap-lg);
  max-width: 60ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-md);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 var(--gap-lg);
  background: var(--fg);
  color: var(--bg);
  border: 1px solid var(--fg);
  border-radius: var(--radius);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 200ms, color 200ms;
}

.button:hover {
  background: var(--surface-deep);
  color: var(--fg);
}

.button-ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--rule);
}

.button-ghost:hover {
  border-color: var(--fg);
  background: transparent;
}

.fine {
  margin: 0;
  color: var(--faint);
  font-size: 0.85rem;
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    gap: var(--gap-lg);
  }
}

/* -- sections ------------------------------------------------------------ */

.section {
  padding-block: var(--gap-lg);
  border-top: 1px solid var(--rule);
}

.section h2 {
  margin: 0 0 var(--gap-md);
  font-size: 1.4rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.section h3 {
  margin: var(--gap-lg) 0 var(--gap-sm);
  font-size: 1.05rem;
}

.section p {
  max-width: 70ch;
  color: var(--muted);
}

.section p strong,
.section li strong {
  color: var(--fg);
}

.section ul {
  max-width: 70ch;
  color: var(--muted);
  padding-left: 1.2em;
}

.section li {
  margin-bottom: var(--gap-xs);
}

/* A rail inside a section. The list rules above are more specific than the
   rail rules, so without this the rail is indented and capped. */
.section .rail {
  max-width: none;
  padding-left: 0;
}

.rail {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--gap-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

/* A section that comes in when it scrolls into view. The rule is scoped to
   the js class, so a page whose script did not load shows everything. */
.js .reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 400ms ease, transform 400ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

.rail h3 {
  margin: 0 0 var(--gap-sm);
  font-size: 1rem;
}

.rail p {
  margin: 0;
  font-size: 0.95rem;
}

/* -- tables -------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  text-align: left;
  padding: var(--gap-sm) var(--gap-md);
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

th {
  color: var(--fg);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

tbody tr:last-child td {
  border-bottom: 0;
}

td code {
  white-space: nowrap;
}

/* -- status -------------------------------------------------------------- */

.tag {
  display: inline-flex;
  align-items: center;
  padding: 1px var(--gap-sm);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.tag-ok {
  color: var(--ok);
  border-color: var(--ok);
}

.tag-warn {
  color: var(--info);
  border-color: var(--info);
}

.tag-bad {
  color: var(--danger);
  border-color: var(--danger);
}

/* -- figures ------------------------------------------------------------- */

figure {
  margin: 0;
}

figcaption {
  margin-top: var(--gap-sm);
  color: var(--faint);
  font-size: 0.85rem;
}

.shot {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--surface);
}

/* -- footer -------------------------------------------------------------- */

.site-footer {
  margin-top: var(--gap-xl);
  border-top: 1px solid var(--rule);
  padding-block: var(--gap-lg);
  color: var(--faint);
  font-size: 0.88rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-md);
  align-items: center;
  justify-content: space-between;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-md);
}

.footer-nav a {
  color: var(--muted);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--fg);
}

/* -- the site's own rules --------------------------------------- */
/* Everything below is specific to this page. The shared rules are
   above. */

/* The repository ships its own font, and the shared stylesheet already
   names JetBrains Mono in --mono. These are the two files that make the
   name mean something. */
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("fonts/jetbrains-mono-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("fonts/jetbrains-mono-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F;
}

/* A screenshot is a card: the image fills it, and the caption sits
   under the image on the same surface. */
.shot {
  overflow: hidden;
}

.shot img {
  width: 100%;
}

.shot figcaption {
  padding: var(--gap-sm) var(--gap-md) var(--gap-md);
}

/* Two figures side by side. Each card is as tall as its own image, so a
   phone-sized screenshot does not leave a hole under a desktop one. */
.pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: var(--gap-lg);
  margin-top: var(--gap-lg);
}

/* The board on a phone-sized window must not grow past the width it
   was drawn at. */
.narrow {
  max-width: 340px;
  justify-self: start;
}

@media (max-width: 720px) {
  .pair {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* A rail is a row of items, not a bulleted list. The shared rules for
   lists inside a section would indent it and cap its width. */
.section .rail {
  max-width: none;
  padding-left: 0;
}

/* A note on disk, and the command that clears the macOS quarantine. */
.sample {
  margin-top: var(--gap-lg);
}

.sample figcaption {
  margin: 0 0 var(--gap-sm);
}

.command {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--gap-md);
  margin-bottom: var(--gap-lg);
}

.command pre {
  flex: 1 1 320px;
  margin: 0;
}

/* Browser surfaces.
 *
 * Selection, the caret, the scrollbar, list markers and the numerals in a
 * table ship with defaults that belong to no design system. They are the
 * cheapest signal that a page was built rather than assembled, and the part
 * most often left to the browser.
 */
::selection {
  background: var(--fg);
  color: var(--bg);
}

:root {
  accent-color: var(--info);
  caret-color: var(--fg);
  scrollbar-color: var(--rule) var(--bg);
  scrollbar-width: thin;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

li::marker {
  color: var(--muted);
}

table,
.num {
  font-variant-numeric: tabular-nums;
}