/*
 * netatalk.io stylesheet
 *
 * Single mobile-first stylesheet. All presentation lives here;
 * markup carries semantic structure only.
 *
 * Brand palette (see gfx/color-review.html for WCAG rationale):
 *   navy #0B1F3A, electric blue #3D82FF, cyan #19E3D2.
 *   Cyan is accent-only: never text or thin lines on light surfaces.
 *   Body links on white use the deeper #1E5AF0 to clear AA.
 */

/* ---------- design tokens ---------- */

:root {
  --navy: #0B1F3A;
  --blue: #3D82FF;
  --cyan: #19E3D2;
  --gradient: linear-gradient(135deg, var(--blue), var(--cyan));

  --bg: #f7f9fc;
  --surface: #ffffff;
  --ink: #0B1F3A;
  --muted: #5b6b82;
  --line: #e6ebf2;
  --link: #1E5AF0;
  --code-bg: #eef2f8;
  --code-ink: #24457a;
  --table-stripe: #f2f6fb;

  --header-ink: #ffffff;
  --header-muted: #b8c6dd;

  --radius: 10px;
  --content-width: 72rem;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --surface: #161c26;
    --ink: #e6edf3;
    --muted: #94a3b8;
    --line: #263141;
    --link: #6ea3ff;
    --code-bg: #1a2230;
    --code-ink: #a5c4f5;
    --table-stripe: #131a24;
  }
}

/* ---------- base ---------- */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  border: 0;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

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

/* keep anchor targets clear of the sticky header */
:target,
main [id] {
  scroll-margin-top: 5.5rem;
}

::selection {
  background: var(--cyan);
  color: var(--navy);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 10;
  padding: 0.5rem 1rem;
  background: var(--navy);
  color: #fff;
}

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

/* ---------- site header (navy in both modes) ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--navy);
  color: var(--header-ink);
}

/* Animated brand accent under the banner: a flowing blue/cyan colour
   sweep with a travelling "packet" dot — a file on its way to a client.
   Blue anchors both ends so the scroll loops seamlessly. The bar is
   full-bleed, so vw units span it without container-query support.
   Animate transform, not `left`, so the motion is GPU-composited. */
.accent-bar {
  position: relative;
  height: 3px;
  overflow: hidden;
  background: linear-gradient(90deg,
    var(--blue) 0%, var(--blue) 15%,
    var(--cyan) 35%, var(--cyan) 65%,
    var(--blue) 85%, var(--blue) 100%);
  background-size: 200% 100%;
  animation: accent-flow 8s linear infinite;
}

@keyframes accent-flow {
  from { background-position: 0% 0; }
  to   { background-position: 200% 0; }
}

/* Packets are spawned in random bursts by the header script, which
   drives their motion at a constant speed via the Web Animations API;
   this rule only supplies their appearance. */
.accent-bar .packet {
  position: absolute;
  left: 0;
  top: 0;
  width: 10px;
  height: 3px;
  border-radius: 1.5px;
  background: #ffffff;
  box-shadow: 0 0 8px 3px var(--cyan);
  will-change: transform;
  opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
  .accent-bar {
    animation: none;
    background-size: 100% 100%;
  }
}

/* The original Netatalk favicon perches at the right end of the accent
   bar; the "network cable" along its base (source rows 27-29 of the
   32px art, white core at row 28) lines up with the bar so the packets
   flow into its wire. At 1x scale the wire core overlays the 3px bar:
   bottom = -1.5px. */
.banner-mascot {
  position: absolute;
  right: 14px;
  bottom: -1.5px;
  width: 32px;
  height: 32px;
  image-rendering: pixelated;
  z-index: 1;
  pointer-events: none;
}

.site-header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0.9rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
}

/* The lockup's navy tile matches the banner, so it blends in seamlessly */
.brand {
  display: block;
}

.brand img {
  display: block;
  width: auto;
  height: 58px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-left: auto;
}

.site-nav a {
  color: var(--header-muted);
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  font-size: 0.95rem;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: #ffffff;
  background: rgba(61, 130, 255, 0.22);
  text-decoration: none;
}

/* ---------- page shell ---------- */

.page {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.25rem 1rem 2.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
}

@media (min-width: 60rem) {
  .page {
    grid-template-columns: minmax(0, 1fr) 17rem;
    padding-top: 2rem;
  }
}

main {
  min-width: 0;
}

/* ---------- sidebar ---------- */

.site-aside {
  min-width: 0;
  font-size: 0.92rem;
}

.navbar,
.search {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  margin-bottom: 1.1rem;
}

.navbar h2,
.search h2 {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.navbar ul,
.navbar ol {
  margin: 0;
  padding-left: 1.1rem;
}

.navbar ul {
  list-style: none;
  padding-left: 0;
}

.navbar li {
  margin: 0.25rem 0;
}

/* Current page: chevron plus name, indented together from the siblings */
.navbar a[aria-current="page"] {
  display: inline-block;
  background: url("/gfx/warp-chevron.svg") no-repeat left 0.45em / auto 0.65em;
  padding-left: 0.95em;
  margin-left: 0.4em;
  font-weight: 600;
  color: var(--ink);
}

.navbar p {
  margin: 0.4rem 0;
}

/* Bare paragraphs before lists are group labels (e.g. wiki sidebar sections) */
.navbar p:has(+ ul),
.navbar p:has(+ ol) {
  margin: 0.9rem 0 0.3rem;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.navbar hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0.7rem 0;
}

/* en | ja switcher: flips content locale and, with it, the search
   language (Pagefind indexes per page language) */
.search h2 {
  display: flex;
  align-items: baseline;
}

.search-lang {
  margin-left: auto;
  text-transform: none;
  letter-spacing: normal;
}

.search-lang span[aria-current] {
  font-weight: 700;
  color: var(--ink);
}

/* Pagefind client-side search, themed with the brand tokens */
.search #sitesearch {
  --pagefind-ui-scale: 0.8;
  --pagefind-ui-primary: var(--link);
  --pagefind-ui-text: var(--ink);
  --pagefind-ui-background: var(--bg);
  --pagefind-ui-border: var(--line);
  --pagefind-ui-tag: var(--code-bg);
  --pagefind-ui-border-width: 1px;
  --pagefind-ui-border-radius: 6px;
  --pagefind-ui-font: inherit;
}

.search .pagefind-ui__search-clear {
  color: var(--muted);
}

.search .pagefind-ui__result {
  border-color: var(--line);
}

.search .pagefind-ui__result-link {
  color: var(--link);
}

.search .pagefind-ui__result-excerpt,
.search .pagefind-ui__message {
  color: var(--muted);
}

.search #sitesearch mark {
  background: var(--cyan);
  color: var(--navy);
  border-radius: 2px;
}

/* sub-result marker: brand chevron instead of Pagefind's ⤷ arrow */
.search #sitesearch .pagefind-ui__result-nested .pagefind-ui__result-link::before {
  content: "";
  width: 0.6em;
  height: 0.75em;
  top: 0.2em;
  right: calc(100% + 0.35em);
  background: url("/gfx/warp-chevron.svg") no-repeat center / auto 100%;
}

/* ---------- content typography ---------- */

main h1,
main h2,
main h3,
main h4,
main h5,
main h6 {
  line-height: 1.25;
  margin: 1.6em 0 0.5em;
  color: var(--ink);
}

main > h1:first-child {
  margin-top: 0;
}

main h1 {
  font-size: 1.9rem;
  letter-spacing: -0.02em;
  padding-bottom: 0.35rem;
  border-bottom: 3px solid transparent;
  border-image: var(--gradient) 1;
}

main h2 {
  font-size: 1.4rem;
}

main h3 {
  font-size: 1.15rem;
}

main h4,
main h5,
main h6 {
  font-size: 1rem;
}

main a.toclink {
  color: inherit;
}

main h3.option {
  font-size: 1rem;
  margin: 1.4em 0 0.4em;
}

main h3.option .option-syntax {
  font-weight: normal;
}

.italic {
  font-style: italic;
  font-size: 0.9em;
}

/* ---------- code ---------- */

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-left: 3px solid var(--blue);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  white-space: pre;
  font-size: 0.9rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--code-ink);
  background: var(--code-bg);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  font-size: 0.92em;
}

pre code {
  padding: 0;
  background: none;
  border: 0;
}

pre.mermaid {
  background: transparent;
  border: 0;
  white-space: pre;
  text-align: center;
}

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

main table {
  border-collapse: collapse;
  margin: 1rem 0 1.5rem;
  width: 100%;
  display: block;
  overflow-x: auto;
  font-size: 0.92rem;
}

@media (min-width: 60rem) {
  main table {
    display: table;
    width: auto;
    min-width: 60%;
  }
}

main th,
main td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

main th {
  background: var(--navy);
  color: #ffffff;
  font-weight: 600;
}

main tbody tr:nth-child(even) {
  background: var(--table-stripe);
}

/* ---------- misc content ---------- */

main blockquote {
  margin: 0.3rem 0 0.9rem;
  padding: 0.3rem 0.75rem;
  border-left: 3px solid var(--cyan);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--muted);
}

main blockquote p {
  margin: 0.35em 0;
}

main blockquote > :first-child {
  margin-top: 0;
}

main blockquote > :last-child {
  margin-bottom: 0;
}

main blockquote blockquote {
  margin: 0.35rem 0;
}

main hr {
  border: 0;
  height: 2px;
  background: var(--gradient);
  opacity: 0.4;
  margin: 2rem 0;
}

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

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.site-footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0.7rem 1rem 0.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 2rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.site-footer p {
  margin: 0.25rem 0;
}

.footer-meta {
  flex: 1 1 18rem;
}

.daemon {
  margin-left: auto;
  align-self: flex-end;
}

.daemon img {
  display: block;
  width: auto;
  height: clamp(47px, 7.75vw, 86px);
}

@media (max-width: 30rem) {
  .daemon img {
    height: 41px;
  }
}

/* ---------- print ---------- */

.print-title {
  display: none;
}

@media print {
  .site-header,
  .site-aside,
  .site-footer,
  .skip-link {
    display: none;
  }

  .print-title {
    display: block;
    text-align: center;
    font-size: 1rem;
    color: #000;
  }

  body {
    background: #fff;
    color: #000;
  }

  .page {
    display: block;
    padding: 0;
  }

  main a {
    color: #000;
  }

  pre {
    border: 1px dashed #666;
  }
}