:root {
  color-scheme: light dark;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  --page-width: 1000px;
  --normal-gap: 16px;
  --section-gap: 48px;
  --card-radius: 8px;
  --background-body: light-dark(#f1f1f1, #11161e);
  --background: light-dark(#fff, #1b222c);
  --background-alt: light-dark(#e9ecf1, #27313f);
  --text-main: light-dark(#40464f, #d8e0e9);
  --text-bright: light-dark(#1c2229, #f5f7fa);
  --text-muted: light-dark(#68717e, #a2aebe);
  --grey: light-dark(#e6e6e6, #303b4c);
  --links: light-dark(#315db5, #9abfff);
  --primary: var(--links);
  --focus: var(--links);
  --border: light-dark(#dfe1e5, #344152);
  --form-text: var(--text-main);
  --button-hover: var(--background-alt);
  --github-logo-filter: none;
  --legacy-logo-filter: none;
  --legacy-logo-blend: multiply;
}

:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] {
  color-scheme: dark;
  --github-logo-filter: invert(1);
  --legacy-logo-filter: invert(1) hue-rotate(180deg);
  --legacy-logo-blend: screen;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --github-logo-filter: invert(1);
    --legacy-logo-filter: invert(1) hue-rotate(180deg);
    --legacy-logo-blend: screen;
  }
}

html {
  scroll-behavior: smooth;
  scroll-padding: 24px;
}

body {
  padding: 20px 20px 32px;
  max-width: var(--page-width);
  margin: 0 auto;
  color: var(--text-main);
  background: var(--background-body);
  font-size: 15px;
  line-height: 1.6;
}

[hidden] { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.site-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px var(--normal-gap);
  padding-block: 8px 28px;
  border-bottom: 1px solid var(--border);
}

.home-link { display: block; width: 220px; max-width: 100%; }
.github-logo { display: block; width: 100%; height: auto; filter: var(--github-logo-filter); }
.site-tools { justify-self: end; }
.collection-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  grid-column: 1 / -1;
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;

  a { color: inherit; text-decoration: none; }
  a:hover { color: var(--links); text-decoration: underline; }
}

.theme-selector {
  display: inline-flex;
  gap: 4px;

  &[hidden] { display: none; }
  button {
    display: grid;
    place-items: center;
    width: 36px;
    height: 36px;
    margin: 0;
    padding: 0;
    border: 1px solid transparent;
    border-radius: var(--card-radius);
    color: var(--text-muted);
    background: transparent;
    box-shadow: none;
    cursor: pointer;

    &:hover { background: var(--background-alt); }
    &[aria-pressed="true"] {
      color: var(--text-bright);
      border-color: var(--border);
      background: var(--background);
    }
  }
  svg { width: 18px; height: 18px; }
}

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

main { padding-top: 32px; }
a { text-underline-offset: 3px; }
h1, h2 { color: var(--text-bright); font-weight: 650; line-height: 1.3; }

.section-heading {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--normal-gap);
  margin-bottom: 20px;

  h1, h2 { margin: 0; font-size: 22px; letter-spacing: -.025em; }
  p { margin: 6px 0 0; color: var(--text-muted); font-size: 13px; }
}
.section-link, .back-link { font-size: 14px; }

.category-heading {
  margin-bottom: 24px;

  .back-link { display: inline-block; margin-bottom: 16px; }
}
.category-heading-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;

  h1 { margin: 0; font-size: 32px; letter-spacing: -.03em; overflow-wrap: anywhere; }
  p { margin: 0; color: var(--text-muted); font-size: 14px; }
}

.grid {
  margin: 0 auto;
  display: grid;
  gap: var(--normal-gap);
}

.card, .category-card {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  background: var(--background);
}
.card { padding: 20px; }
.card h2 { font-size: 18px; margin: 0; }

.featured-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
  color: var(--text-main);
  background: var(--background);
  text-decoration: none;

  &:hover { border-color: var(--links); }
  img { display: block; width: 100%; height: auto; }
  &:not(.app-feature) img {
    filter: var(--legacy-logo-filter);
    mix-blend-mode: var(--legacy-logo-blend);
  }

  &.app-feature {
    align-items: center;
    gap: 8px;
    padding: 20px;
    text-align: center;
    background: var(--background);

    img { width: 56px; height: 56px; }
    h2 { font-size: 18px; }
    p { max-width: 28ch; margin: 0; color: var(--text-muted); font-size: 13px; }
  }
}

.categories { margin-top: var(--section-gap); }
.category-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-bright);
  text-decoration: none;

  &:hover { border-color: var(--links); color: var(--links); }
  .category-name { min-width: 0; font-size: 16px; font-weight: 600; overflow-wrap: anywhere; }
  .category-count {
    flex: none;
    min-width: 2ch;
    padding: 2px 7px;
    border-radius: 5px;
    color: var(--text-muted);
    background: var(--background-alt);
    font: 13px / 1.6 ui-monospace, "SFMono-Regular", Consolas, monospace;
    text-align: center;
  }
}

.category-filter {
  position: relative;
  flex: 0 1 300px;
  width: min(100%, 300px);

  input {
    width: 100%;
    margin: 0;
    padding: 10px 42px 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--card-radius);
    color: var(--text-main);
    background: var(--background);
    font: inherit;
    font-size: 16px;
    box-shadow: none;

    &::placeholder { color: var(--text-muted); }
  }
  kbd {
    position: absolute;
    top: 50%;
    right: 12px;
    transform: translateY(-50%);
    padding: 2px 5px;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-muted);
    background: var(--background-alt);
    font: 13px / 1.2 ui-monospace, "SFMono-Regular", Consolas, monospace;
    pointer-events: none;
  }
}
.empty-state { margin: 0; padding: 24px 0; color: var(--text-muted); }

.repository-card {
  display: flex;
  flex-direction: column;
  gap: 24px;

  .repository-copy { flex: 1; min-width: 0; }
  h2 { overflow-wrap: anywhere; }
  h2 a { text-decoration: none; }
  h2 a:hover { text-decoration: underline; }
  p { margin: 10px 0 0; color: var(--text-muted); font-size: 14px; }
}
.repository-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;

  .tag {
    max-width: 100%;
    margin: 0;
    padding: 2px 8px;
    border: 1px solid var(--border);
    border-radius: 5px;
    color: var(--text-main);
    background: var(--background-alt);
    font-size: 12px;
    line-height: 1.6;
    text-decoration: none;
    overflow-wrap: anywhere;

    &[aria-current="page"], &:hover { border-color: var(--links); color: var(--links); }
  }
}

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;

  nav { display: flex; flex-wrap: wrap; gap: 12px 20px; }
  nav a { color: inherit; text-decoration: none; }
  nav a:hover { color: var(--links); text-decoration: underline; }
}
.artifact-stamp {
  display: block;
  width: 252px;
  max-width: 70%;
  margin-left: auto;

  picture, img { display: block; width: 100%; height: auto; }
}

@media (max-width: 599px) {
  .category-filter { flex-basis: 100%; width: 100%; }
}

@media (min-width: 600px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}