/* A calm winter page: washi paper and sumi ink, one muted indigo,
   a far ridge under the name, and a lot of quiet space. Fonts are self-hosted. */
@font-face {
  font-family: "Source Serif 4";
  font-weight: 400 600;
  font-display: swap;
  src: url("/fonts/source-serif-4-latin.woff2") format("woff2");
}
@font-face {
  font-family: "Inter";
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/inter-latin.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-weight: 100 800;
  font-display: swap;
  src: url("/fonts/jetbrains-mono-latin.woff2") format("woff2");
}

:root {
  --font-sans: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Source Serif 4", Georgia, "Iowan Old Style", serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --paper: #ebe4d6;      /* eggshell */
  --sky: #f3eee4;        /* the pale sky over the ridge */
  --surface: #f5f0e7;    /* cream */
  --ink: #2e251f;        /* espresso */
  --ink-2: #5b4e43;
  --stone: #8a7867;
  --line: #dbd0be;
  --line-strong: #c4b49e;
  --ai: #8a5d3b;         /* a roasted coffee */
  --ai-soft: #e2d6c3;
  --ridge: #cdbfac;      /* snow on a far ridge at dusk */
  --shadow: 0 1px 2px rgb(62 42 24 / 0.06), 0 12px 32px -12px rgb(62 42 24 / 0.18);
}

/* Dark follows the system unless the switcher picked a side (theme.js sets data-theme). */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #12161b;    /* a winter night */
    --sky: #171c22;
    --surface: #181d23;
    --ink: #e8eae6;      /* snow under moonlight */
    --ink-2: #b2b9c0;
    --stone: #8a939c;
    --line: #252c34;
    --line-strong: #3a434d;
    --ai: #9fb5cc;
    --ai-soft: #1e2630;
    --ridge: #2c3540;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 16px 40px -16px rgb(0 0 0 / 0.6);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #12161b;    /* a winter night */
  --sky: #171c22;
  --surface: #181d23;
  --ink: #e8eae6;      /* snow under moonlight */
  --ink-2: #b2b9c0;
  --stone: #8a939c;
  --line: #252c34;
  --line-strong: #3a434d;
  --ai: #9fb5cc;
  --ai-soft: #1e2630;
  --ridge: #2c3540;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 16px 40px -16px rgb(0 0 0 / 0.6);
}
:root[data-theme="light"] { color-scheme: light; }

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

html { background: var(--paper); }
body {
  margin: 0;
  /* A pale sky that settles into the paper by the ridge. */
  background: linear-gradient(to bottom, var(--sky), var(--paper) 34rem) no-repeat, var(--paper);
  color: var(--ink);
  font: 16px/1.75 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ai); text-underline-offset: 3px; text-decoration-thickness: 1px; }

.skip {
  position: absolute;
  left: 16px;
  top: -48px;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 6px;
  z-index: 2;
}
.skip:focus { top: 16px; }

.band {
  max-width: 62rem;
  margin: 0 auto;
  padding-inline: 2rem;
}

.dim { color: var(--ink-2); }

/* --- top line --- */
.nav {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.75rem;
  font-size: 0.875rem;
}
.nav .home {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  color: var(--ink);
  text-decoration: none;
}
.nav ul { display: flex; gap: 1.5rem; margin: 0; padding: 0; list-style: none; }
.nav ul a { color: var(--stone); text-decoration: none; transition: color 160ms ease; }
.nav ul a:hover, .nav ul a[aria-current] { color: var(--ink); }
.nav ul { align-items: baseline; }

/* The theme switcher: one quiet button that steps Auto → Light → Dark. */
.theme {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  color: var(--stone);
  cursor: pointer;
  transition: color 160ms ease;
}
.theme[hidden] { display: none; }
.theme:hover { color: var(--ink); }
.theme:focus-visible { outline: 1px solid var(--ai); outline-offset: 4px; border-radius: 2px; }
.theme svg { width: 14px; height: 14px; }

/* --- headings --- */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 0;
}
h1 { font-size: clamp(2.5rem, 6.5vw, 3.75rem); }
h2 { font-size: 2rem; margin-bottom: 1rem; }
h3 { font-size: 1.375rem; margin-bottom: 0.5rem; }

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--stone);
}

.lede {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--ink-2);
  text-wrap: balance;
  max-width: 38rem;
}
h1 + .lede { margin-top: 1.25rem; }

/* --- hero, with a far ridge under it --- */
.hero { padding-block: 5rem 0; }
.ridge {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 3.5rem;
  color: var(--ridge);
  -webkit-mask-image: linear-gradient(to bottom, #000 35%, transparent);
  mask-image: linear-gradient(to bottom, #000 35%, transparent);
}

/* --- section label: a quiet word and a hairline --- */
.section-label {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 3rem;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1rem;
  color: var(--stone);
}
.section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* --- projects --- */
main { padding-block: 4rem 3rem; }
#work > section + section { margin-top: 4rem; }

.project {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 3.5rem;
  align-items: center;
  padding-block: 3.5rem;
  border-top: 1px solid var(--line);
}
.project:first-of-type { border-top: 0; padding-top: 0; }

.copy p { margin: 0 0 1rem; }
.copy p.eyebrow { margin-bottom: 0.75rem; }

code {
  font: 0.875em var(--font-mono);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--ai-soft);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 1.25rem 0 1.5rem;
  padding: 0;
  list-style: none;
}
.tags li {
  padding: 1px 10px;
  border-radius: 999px;
  background: var(--ai-soft);
  font-size: 0.8125rem;
  color: var(--ink-2);
}

.links { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; }
.go {
  display: inline-flex;
  gap: 0.4em;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: border-color 160ms ease;
}
.go.quiet { font-weight: 400; color: var(--ink-2); }
.go:hover { border-color: var(--ai); }
.go span { transition: transform 160ms ease; }
.go:hover span { transform: translateX(3px); }

/* A browser window, soft as paper. */
.frame {
  display: block;
  color: inherit;
  text-decoration: none;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: border-color 200ms ease, transform 200ms ease;
}
a.frame:hover { border-color: var(--line-strong); transform: translateY(-2px); }

.bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}
.bar i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-strong);
  opacity: 0.6;
}
.url {
  flex: 1;
  margin-left: 8px;
  padding: 2px 10px;
  border-radius: 4px;
  background: var(--paper);
  font: 11px var(--font-mono);
  color: var(--stone);
}
.frame img { display: block; width: 100%; height: auto; }

/* --- a product's own page --- */
.page-head { padding-block: 4rem 3rem; }
.page-head .links { margin-top: 1.75rem; }
.wide { margin-bottom: 4rem; }

.facts { padding-block: 1rem 2rem; }
.fact {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: 2rem;
  padding-block: 2.25rem;
  border-top: 1px solid var(--line);
}
.fact > h2 {
  font-size: 1.125rem;
  font-style: italic;
  color: var(--stone);
  margin: 0;
  padding-top: 0.2rem;
}
.fact p { margin: 0 0 1rem; max-width: 40rem; }
.fact p:last-child { margin-bottom: 0; }
.fact ul.points { margin: 0; padding: 0; list-style: none; max-width: 40rem; }
.fact ul.points li { position: relative; padding-left: 1.25rem; margin-bottom: 0.75rem; }
.fact ul.points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 6px;
  height: 1px;
  background: var(--stone);
}
.fact ul.points li:last-child { margin-bottom: 0; }

.stack { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 0.5rem 1.5rem; margin: 0; }
.stack dt { color: var(--ink); }
.stack dd { margin: 0; color: var(--ink-2); }

.pair { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.5rem; margin-block: 1rem 3rem; }
.caption { margin: 0.75rem 0 0; font-size: 0.875rem; color: var(--stone); }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 2.5rem 1rem;
  border-top: 1px solid var(--line);
}
.pager a { text-decoration: none; color: var(--ink); }
.pager a span { display: block; font-size: 0.8125rem; color: var(--stone); }
.pager a:last-child { text-align: right; margin-left: auto; }

/* --- open-source tools --- */
.tool {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 2.5rem;
  padding-block: 2.5rem;
  border-top: 1px solid var(--line);
}
.tool:first-of-type { border-top: 0; padding-top: 0; }
.tool .meta { font-size: 0.875rem; color: var(--stone); margin: 0.25rem 0 0; }
.tool p { margin: 0 0 1rem; }
pre.install {
  margin: 0 0 1rem;
  padding: 0.875rem 1rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  font: 13px/1.6 var(--font-mono);
  color: var(--ink-2);
}
pre.install code { padding: 0; background: none; font-size: inherit; }

.teaser { display: flex; align-items: baseline; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.teaser p { margin: 0; max-width: 36rem; color: var(--ink-2); }

/* --- footer --- */
.foot {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 2rem 3rem;
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  color: var(--stone);
}
.foot a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 160ms ease, border-color 160ms ease;
}
.foot a:hover { color: var(--ink); border-color: var(--ai); }

@media (max-width: 760px) {
  .band { padding-inline: 16px; }
  .hero { padding-block: 3rem 0; }
  .ridge { margin-top: 2.5rem; }
  .lede { font-size: 1.125rem; }
  main { padding-top: 3rem; }
  .project, .tool, .fact {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.25rem;
  }
  /* Picture first on a phone, then the words. */
  .project .frame { order: -1; }
  .pair { grid-template-columns: minmax(0, 1fr); }
  h2 { font-size: 1.75rem; }
  .page-head { padding-block: 2.5rem 2rem; }
  .wide { margin-bottom: 2.5rem; }
  .nav ul { gap: 1rem; }
  .stack { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .stack dd { margin-bottom: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

figure { margin: 0; }