/* rustmc.cc: "rust-forged / industrial". Dark steel and molten orange; light is mill-scale and ash. */

@font-face {
  font-family: "Archivo";
  src: url("/static/fonts/archivo-latin-wdth.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/static/fonts/plex-sans-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/static/fonts/plex-sans-600.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/static/fonts/jetbrains-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --steel-0: #0f1113;
  --steel-1: #171a1d;
  --steel-2: #1f2327;
  --line: #2f363c;
  --line-strong: #46505a;
  --text: #ebe6de;
  --muted: #a2a8ad;
  --molten: #ff6b1a;
  --heat: #ffb24a;
  --ember: #5a200a;
  --on-molten: #0f1113;
  --code: #e9d8c4;
  --grain: rgba(255, 255, 255, 0.018);

  --display: "Archivo", "Arial Narrow", system-ui, sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 80px;
  --radius: 4px;
  --edge: 2px;
  --page: 1180px;
  --gutter: 16px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --steel-0: #efece6;
  --steel-1: #f8f6f2;
  --steel-2: #e4e0d8;
  --line: #cfc9be;
  --line-strong: #a69f92;
  --text: #16191c;
  --muted: #4f565c;
  --molten: #b93d09;
  --heat: #8a3a00;
  --ember: #f6d3bd;
  --on-molten: #ffffff;
  --code: #3a2410;
  --grain: rgba(0, 0, 0, 0.025);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --steel-0: #efece6;
    --steel-1: #f8f6f2;
    --steel-2: #e4e0d8;
    --line: #cfc9be;
    --line-strong: #a69f92;
    --text: #16191c;
    --muted: #4f565c;
    --molten: #b93d09;
    --heat: #8a3a00;
    --ember: #f6d3bd;
    --on-molten: #ffffff;
    --code: #3a2410;
    --grain: rgba(0, 0, 0, 0.025);
  }
}

@media (min-width: 720px) {
  :root { --gutter: 32px; }
}

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

html { -webkit-text-size-adjust: 100%; scroll-padding-top: 88px; }

body {
  margin: 0;
  background-color: var(--steel-0);
  /* Brushed steel: fine horizontal grain, no image. */
  background-image: repeating-linear-gradient(0deg, var(--grain) 0 1px, transparent 1px 3px);
  color: var(--text);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
}

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

a { color: var(--molten); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--heat); text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--heat);
  outline-offset: 2px;
  border-radius: 2px;
}

h1, h2, h3 {
  font-family: var(--display);
  font-stretch: 112%;
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-3);
}
h1 { font-size: clamp(2.1rem, 6vw, 3.8rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.4rem); font-weight: 750; }
h3 { font-size: 1.25rem; font-weight: 700; font-stretch: 100%; }
p { margin: 0 0 var(--space-3); }

code, pre, kbd { font-family: var(--mono); font-size: 0.88em; }
:not(pre) > code {
  background: var(--steel-2);
  color: var(--code);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  overflow-wrap: anywhere;
}
pre {
  background: var(--steel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--molten);
  border-radius: var(--radius);
  padding: var(--space-3);
  overflow-x: auto;
  line-height: 1.5;
  margin: 0 0 var(--space-4);
}
pre code { color: var(--code); }

.skip {
  position: absolute;
  left: var(--space-3);
  top: -60px;
  background: var(--molten);
  color: var(--on-molten);
  padding: var(--space-2) var(--space-3);
  z-index: 10;
  font-weight: 600;
}
.skip:focus { top: var(--space-2); }

.wrap { max-width: var(--page); margin: 0 auto; padding: 0 var(--gutter); }

/* --- Header ------------------------------------------------------------------------------- */

.top {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--steel-0) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.top .wrap {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 64px;
  flex-wrap: wrap;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}
.brand img { width: 34px; height: 34px; }
.wordmark {
  font-family: var(--display);
  font-weight: 850;
  font-stretch: 125%;
  font-size: 1.3rem;
  letter-spacing: 0.01em;
}
.wordmark b { color: var(--molten); font-weight: inherit; }
.brand:hover { color: var(--text); }

.nav { display: flex; gap: var(--space-1); flex-wrap: wrap; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 6px 10px;
  border-radius: var(--radius);
}
.nav a:hover { color: var(--text); background: var(--steel-2); }
.nav a[aria-current="page"] { color: var(--text); box-shadow: inset 0 -2px 0 var(--molten); border-radius: 0; }

.theme {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: var(--radius);
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
}
.theme:hover { color: var(--text); border-color: var(--line-strong); }
.theme svg { width: 18px; height: 18px; }

@media (max-width: 719px) {
  .top .wrap { padding-top: 8px; padding-bottom: 0; row-gap: 0; }
  .nav {
    order: 3;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    width: calc(100% + 2 * var(--gutter));
    margin: 0 calc(-1 * var(--gutter));
    padding: 0 calc(var(--gutter) - 8px);
  }
  .nav::-webkit-scrollbar { display: none; }
  /* The last item fades out, so a cut-off one reads as "scroll for more". */
  .nav { mask-image: linear-gradient(to right, #000 85%, transparent); }
  .nav a { padding: 10px 8px; white-space: nowrap; font-size: 0.92rem; }
}

/* --- Buttons and plates ------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 46px;
  padding: 10px 20px;
  border: var(--edge) solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--text);
  background: var(--steel-1);
  font-weight: 600;
  text-decoration: none;
  line-height: 1.2;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease;
}
.btn:hover { border-color: var(--molten); color: var(--text); }
.btn.primary { background: var(--molten); border-color: var(--molten); color: var(--on-molten); }
.btn.primary:hover { background: var(--heat); border-color: var(--heat); color: var(--on-molten); }
.btn[aria-disabled="true"] { cursor: default; color: var(--muted); border-style: dashed; }
.btn[aria-disabled="true"]:hover { border-color: var(--line-strong); }
.btn .soon {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-left: 1px solid var(--line);
  padding-left: var(--space-2);
}
.actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: var(--space-4) 0; }

/* A riveted label: "01 / Bridge". */
.plate {
  display: block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--space-3);
}
.plate::before {
  content: "";
  display: inline-block;
  vertical-align: middle;
  width: 6px;
  height: 6px;
  margin: 0 10px 2px 0;
  border-radius: 50%;
  background: var(--line-strong);
  box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.4);
}
.plate span { color: var(--molten); }

/* --- Home --------------------------------------------------------------------------------- */

.hero {
  position: relative;
  padding: var(--space-7) 0 var(--space-6);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero::after {
  /* The forge: heat rising from the bottom edge. The one gradient on the site. */
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -220px;
  height: 420px;
  background: radial-gradient(ellipse at center, var(--ember) 0%, transparent 68%);
  opacity: 0.9;
  pointer-events: none;
  animation: breathe 7s ease-in-out infinite;
}
.hero .wrap { position: relative; z-index: 1; }
.hero h1 { max-width: 16ch; }
.hero h1 em { font-style: normal; color: var(--molten); }
.hero .lede { font-size: 1.2rem; color: var(--muted); max-width: 60ch; }
@keyframes breathe { 0%, 100% { opacity: 0.75; } 50% { opacity: 1; } }

.figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0;
  border: var(--edge) solid var(--line);
  border-radius: var(--radius);
  background: var(--steel-1);
  margin-top: var(--space-5);
}
.figure { padding: var(--space-4); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.figure strong {
  display: block;
  font-family: var(--display);
  font-stretch: 125%;
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1;
  color: var(--text);
}
.figure span { color: var(--muted); font-size: 0.95rem; }
.figures-note { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); margin-top: var(--space-2); }

.section { padding: var(--space-6) 0; border-bottom: 1px solid var(--line); }
.section > .wrap > p.intro { color: var(--muted); max-width: 64ch; font-size: 1.08rem; }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.card {
  display: block;
  background: var(--steel-1);
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-strong);
  border-radius: var(--radius);
  padding: var(--space-4);
  color: var(--text);
  text-decoration: none;
  transition: border-color 160ms ease;
}
a.card:hover { border-top-color: var(--molten); color: var(--text); }
.card h3 { margin-bottom: var(--space-2); }
.card p { color: var(--muted); margin: 0; font-size: 0.98rem; }
.card .more { display: inline-block; margin-top: var(--space-3); color: var(--molten); font-weight: 600; font-size: 0.95rem; }

.pending {
  border: var(--edge) dashed var(--line-strong);
  border-radius: var(--radius);
  padding: var(--space-4);
  background: var(--steel-1);
}
.pending h3 { margin-bottom: var(--space-2); }
.pending p { color: var(--muted); margin: 0; }

/* --- Features ----------------------------------------------------------------------------- */

.feature { padding: var(--space-6) 0; border-bottom: 1px solid var(--line); }
.feature-grid { display: grid; gap: var(--space-5); align-items: start; }
@media (min-width: 960px) {
  .feature-grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .feature-grid.text-only { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}
.feature p { max-width: 62ch; }
.feature ul { padding-left: 1.2em; margin: 0 0 var(--space-3); }
.feature li { margin-bottom: var(--space-1); }
.feature .docs-link { font-weight: 600; }
.credit {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  padding: 2px 8px;
  border-radius: 2px;
  margin-bottom: var(--space-3);
}

.shot { margin: 0; }
.shot img {
  border: var(--edge) solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--steel-2);
}
.shot figcaption {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: var(--space-2);
  line-height: 1.45;
}
.shots { display: grid; gap: var(--space-3); }
.shots.pair { grid-template-columns: minmax(0, 3fr) minmax(0, 1fr); align-items: start; }
@media (max-width: 559px) { .shots.pair { grid-template-columns: 1fr; } .shots.pair .phone { max-width: 220px; } }

.toc { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); padding: 0; list-style: none; }
.toc a {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 10px;
  font-size: 0.92rem;
  color: var(--text);
  text-decoration: none;
  background: var(--steel-1);
}
.toc a:hover { border-color: var(--molten); }

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

.page-head { padding: var(--space-6) 0 var(--space-4); border-bottom: 1px solid var(--line); }
.page-head p { color: var(--muted); max-width: 64ch; font-size: 1.1rem; margin: 0; }

/* --- Downloads and changelog -------------------------------------------------------------- */

.rows { border: var(--edge) solid var(--line); border-radius: var(--radius); margin: var(--space-4) 0; background: var(--steel-1); }
.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--line);
}
.row:last-child { border-bottom: 0; }
.row h3 { margin: 0; font-size: 1.1rem; }
.row .file { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); overflow-wrap: anywhere; }

.release { border-left: 3px solid var(--molten); padding-left: var(--space-4); margin: var(--space-5) 0; }
.release time { font-family: var(--mono); color: var(--muted); font-size: 0.85rem; }

/* --- Docs --------------------------------------------------------------------------------- */

.docs { display: grid; gap: var(--space-5); padding-top: var(--space-5); padding-bottom: var(--space-7); }
@media (min-width: 960px) { .docs { grid-template-columns: 270px minmax(0, 1fr); } }

.sidebar { font-size: 0.94rem; }
@media (min-width: 960px) {
  .sidebar { position: sticky; top: 88px; max-height: calc(100vh - 104px); overflow-y: auto; padding-right: var(--space-2); }
  .sidebar > details > summary { display: none; }
}
.sidebar details > summary {
  cursor: pointer;
  font-weight: 600;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 14px;
  background: var(--steel-1);
  list-style: none;
}
.sidebar details > summary::-webkit-details-marker { display: none; }
.sidebar details > summary::after { content: " +"; color: var(--molten); }
.sidebar details[open] > summary::after { content: " –"; }
.sidebar h2 {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 400;
  margin: var(--space-4) 0 var(--space-2);
}
.sidebar ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.sidebar li a {
  display: block;
  padding: 4px 12px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--text);
  text-decoration: none;
  line-height: 1.35;
}
.sidebar li a:hover { color: var(--molten); }
.sidebar li a[aria-current="page"] { border-left-color: var(--molten); color: var(--molten); font-weight: 600; }

.search { position: relative; margin-bottom: var(--space-3); }
.search label { display: block; font-weight: 600; margin-bottom: var(--space-1); font-size: 0.9rem; }
.search input {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--steel-1);
  border: var(--edge) solid var(--line-strong);
  border-radius: var(--radius);
  padding: 9px 12px;
}
.search input:focus-visible { outline: 3px solid var(--heat); outline-offset: 0; border-color: var(--heat); }
.search kbd {
  position: absolute;
  right: 10px;
  top: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  padding: 0 6px;
  color: var(--muted);
  font-size: 0.78rem;
}
.results { list-style: none; margin: var(--space-2) 0 0; padding: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--steel-1); max-height: 60vh; overflow-y: auto; }
.results:empty { display: none; }
.results li a { display: block; padding: 8px 12px; border-bottom: 1px solid var(--line); color: var(--text); text-decoration: none; }
.results li:last-child a { border-bottom: 0; }
.results li a:hover, .results li a:focus-visible { background: var(--steel-2); outline-offset: -3px; }
.results .where { display: block; font-family: var(--mono); font-size: 0.72rem; color: var(--muted); }
.results .what { display: block; font-weight: 600; }
.results .excerpt { display: block; font-size: 0.85rem; color: var(--muted); }
.results .none { padding: 8px 12px; color: var(--muted); }

.prose { min-width: 0; }
.prose .crumb { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: var(--space-2); }
.prose h1 { font-size: clamp(1.9rem, 4.5vw, 2.8rem); }
.prose h2 { font-size: 1.55rem; margin-top: var(--space-6); padding-top: var(--space-3); border-top: 1px solid var(--line); }
.prose h3 { margin-top: var(--space-5); }
.prose h4 { margin: var(--space-4) 0 var(--space-2); font-size: 1.02rem; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 var(--space-3); }
.prose li { margin-bottom: 4px; }
.prose table { border-collapse: collapse; margin: 0 0 var(--space-4); font-size: 0.92rem; display: block; overflow-x: auto; max-width: 100%; }
.prose th, .prose td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
.prose th { background: var(--steel-2); font-weight: 600; }
.prose blockquote { margin: 0 0 var(--space-3); padding: var(--space-2) var(--space-3); border-left: 3px solid var(--line-strong); color: var(--muted); }
.prose h2 a.anchor, .prose h3 a.anchor { color: var(--line-strong); text-decoration: none; margin-left: 0.3em; }
.on-page { border: 1px solid var(--line); border-radius: var(--radius); background: var(--steel-1); padding: var(--space-3) var(--space-4); margin: var(--space-4) 0; font-size: 0.94rem; }
.on-page summary { cursor: pointer; font-weight: 600; }
.on-page ul { list-style: none; padding: 0; margin: var(--space-2) 0 0; columns: 2 220px; }
.on-page li { break-inside: avoid; }
.source-note { margin-top: var(--space-6); padding-top: var(--space-3); border-top: 1px solid var(--line); font-family: var(--mono); font-size: 0.78rem; color: var(--muted); overflow-wrap: anywhere; }

/* --- Footer ------------------------------------------------------------------------------- */

.foot { padding: var(--space-5) 0 var(--space-6); color: var(--muted); font-size: 0.92rem; }
.foot .wrap { display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-5); justify-content: space-between; }
.foot a { color: var(--muted); }
.foot a:hover { color: var(--molten); }
.foot ul { list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-3); margin: 0; padding: 0; }

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

.btn.primary .soon { color: inherit; border-left-color: currentColor; opacity: 0.85; }
.fog-row { margin-top: var(--space-5); }

.hero-mark { display: none; }
@media (min-width: 1100px) {
  .hero-mark {
    display: block;
    position: absolute;
    right: var(--gutter);
    top: 8px;
    width: 280px;
    height: 280px;
    filter: drop-shadow(0 18px 40px color-mix(in srgb, var(--molten) 35%, transparent));
  }
}

.stack { display: grid; gap: var(--space-4); }
.stack > div:first-child p, .stack > div:first-child ul { max-width: 70ch; }
@media (min-width: 720px) { .shots.two { grid-template-columns: 1fr 1fr; } }

/* A grid's implicit column grows to its widest line of code; pin single columns to the viewport. */
.feature-grid, .docs, .stack, .shots { grid-template-columns: minmax(0, 1fr); }
@media (min-width: 960px) {
  .feature-grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
  .feature-grid.text-only { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
  .docs { grid-template-columns: 270px minmax(0, 1fr); }
}
@media (min-width: 560px) { .shots.pair { grid-template-columns: minmax(0, 3fr) minmax(0, 1fr); } }
@media (min-width: 720px) { .shots.two { grid-template-columns: 1fr 1fr; } }
.prose .card h3 { margin-top: 0; }