/* ==========================================================================
   moonshot — landing page
   own identity, gwern-structured. static HTML + CSS only, no JS yet.
   colour: a single forced dark monochrome scheme — dark ground, light text,
   no light mode and no system/theme switching. the ONE exception is --logo,
   the colour of the ※ mark; everything else is neutral grey.
   ========================================================================== */

:root {
  color-scheme: dark;     /* keep form controls / scrollbars dark too */

  --bg:        #131313;
  --bg-inset:  #1e1e1e;
  --ink:       #e6e6e6;
  --ink-soft:  #b6b6b6;
  --muted:     #7c7c7c;
  --accent:    #f2f2f2;   /* emphasis / links: the brightest neutral */
  --accent-dim:#bdbdbd;
  --rule:      #333333;
  --logo:      #e08055;   /* the sole spot of colour: the ※ logo */

  --measure:   40rem;     /* reading column width */
  --gutter:    2rem;

  /* system serif for now; the long-term plan is an own-made font, designed for
     both this site and the kernel — not a downloaded third-party face. */
  --serif: Georgia, 'Times New Roman', 'Nimbus Roman', 'Liberation Serif', serif;
  --mono:  ui-monospace, 'SF Mono', 'JetBrains Mono', Menlo, Consolas, monospace;
}

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

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* page frame: content centered, generous room in the right margin so
     sidenotes have somewhere to live once the framework lands. */
  padding: clamp(2rem, 6vw, 5rem) var(--gutter) 4rem;
}

::selection { background: var(--accent); color: var(--bg); }

a {
  color: var(--accent);
  text-decoration: none;
  /* monochrome scheme: colour alone no longer separates links from text, so
     in-flow links carry a persistent underline. structural links (nav, brand,
     crumbs) opt out below and lean on context instead. */
  border-bottom: 1px solid var(--rule);
  transition: border-color 120ms ease, color 120ms ease;
}
a:hover { color: var(--accent-dim); border-bottom-color: currentColor; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* external links: an explicit marker so it is clear the link leaves the site,
   set in ink rather than the accent colour. applies across every page. */
a.ext,
a[href^="http"] {
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
}
a.ext:hover,
a[href^="http"]:hover {
  color: var(--accent-dim);
  border-bottom-color: currentColor;
}
a.ext::after,
a[href^="http"]::after {
  content: "";                 /* ↗ leaves-the-site marker */
  display: inline-block;
  width: 0.55em; height: 0.55em;
  vertical-align: middle;
  margin-left: 0.14em;
  background-image: url(icons/arrow-ne.svg);
}

/* internal cross-references: marked with a small ※, the site's own reference
   mark, so they read differently from the ↗ that leaves the site. sits on the
   baseline, not raised. */
a.int::after {
  content: "";                 /* ※ stays-on-the-site marker */
  display: inline-block;
  width: 0.55em; height: 0.55em;
  margin-left: 0.14em;
  vertical-align: middle;
  background-image: url(icons/ref.svg);
}

/* withheld references: the moonshot operating-system documentation is written
   but held back from publication until it has been reviewed by hand. a link
   that would lead into it is rendered inert (a plain span, not an anchor, so it
   goes nowhere), shown in muted text, and marked with a broken ⚠. see the meta
   page for the note to readers. */
.wip {
  color: var(--muted);
  cursor: not-allowed;
  border-bottom: 1px dotted var(--rule);
}
.wip::after {
  content: "";                 /* ⚠ withheld / not-yet-published marker */
  display: inline-block;
  height: 0.58em; width: auto;
  aspect-ratio: 886 / 767;
  vertical-align: middle;
  margin-left: 0.16em;
  background-image: url(icons/warn.svg);
}

h1, h2, h3 { font-weight: 400; line-height: 1.2; }

.muted { color: var(--muted); }

/* -------------------------------------------------------- symbol icons ---
   the site's marks (※ ✹ ⚒ ✎ ↓ ● ◆ ↗ ⚠) are saved under icons/ as SVGs drawn
   from real glyph outlines, and shown as background images so they render for
   every visitor regardless of which fonts they have, and keep working when the
   page is opened straight over file:// (a CSS mask would not: masks are same
   origin only, and file:// treats every asset as a foreign origin). the one
   colour each mark carries is baked into its file, since the site is a single
   forced-dark theme. */
.mark, .rule,
ul.entries .glyph, ul.categories .cat-icon, .ico,
a.int::after, a.ext::after, a[href^="http"]::after, .wip::after {
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
}

/* the ※ logo: the one coloured mark */
.mark {
  display: inline-block;
  width: 1em; height: 1em;
  background-image: url(icons/mark.svg);
}

/* background image for each mark, shared by the category list, the newest list
   and the inline mentions in running text. the category-set marks (tech / blog /
   arrow-dn / disc / diamond) are drawn inside a shared SQUARE window, so in the
   square boxes below they share one footprint and the category labels align in a
   column; each glyph then sits at its own natural size within that square. the
   inline-marker marks (ext / ref / warn) stay tight, so warn keeps its own
   aspect-ratio and ext / ref are square. */
.ico-tech    { background-image: url(icons/tech.svg); }
.ico-blog    { background-image: url(icons/blog.svg); }
.ico-dn      { background-image: url(icons/arrow-dn.svg); }
.ico-disc    { background-image: url(icons/disc.svg); }
.ico-diamond { background-image: url(icons/diamond.svg); }
.ico-ext     { background-image: url(icons/arrow-ne.svg); aspect-ratio: 1; }
.ico-ref     { background-image: url(icons/ref.svg);      aspect-ratio: 1; }
.ico-warn    { background-image: url(icons/warn.svg);     aspect-ratio: 886 / 767; }

/* an inline mark set in running text (e.g. the meta page's key to the marks) */
.ico {
  display: inline-block;
  height: 0.8em; width: auto;
  vertical-align: middle;
}

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

.site-head,
main,
.site-foot { max-width: var(--measure); margin-inline: auto; }

.site-head { margin-bottom: 2.5rem; }

.site-title {
  display: flex;
  align-items: center;
  gap: 0.4ch;
  font-size: clamp(2.4rem, 7vw, 3.4rem);
  letter-spacing: -0.01em;
  margin: 0 0 0.35rem;
}
/* the mark box is geometrically centred by the flex row, so no optical nudge */
.site-title .mark { width: 0.62em; height: 0.62em; }

.tagline {
  margin: 0;
  color: var(--ink-soft);
  font-style: italic;
  font-size: 1.05rem;
  max-width: 34rem;
}

/* --------------------------------------------------------------- main --- */

main > section { margin: 0; }

/* section labels (ABOUT / NEWEST / CATEGORIES on the home page, TECHNICAL /
   RELATED on the documentation pages): one shared style, everywhere. larger
   and tighter than the first take, which read as too small and too airy. */
h2 {
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 0.9rem;
}

.about p {
  margin: 0 0 1.1rem;
  text-align: justify;
  hyphens: auto;
}
.about p:last-child { margin-bottom: 0; }
.about strong { font-weight: 700; }

/* asterism separators: the ✹ star, set in the logo colour like the ※ mark */
.rule {
  display: block;
  width: 1.4rem; height: 1.4rem;
  margin: 3rem auto;
  background-image: url(icons/star.svg);
  opacity: 0.85;
}

/* motto — sits under the last separator, above the footer */
.motto {
  text-align: center;
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  margin: 0;
}

/* newest + categories, side by side. sits well below the about section so the
   two blocks read as separate. */
.index {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr);
  gap: 2.4rem;
  margin-top: 3.6rem;
}

ul.entries,
ul.categories { list-style: none; margin: 0; padding: 0; }

ul.entries li,
ul.categories li {
  margin: 0 0 0.5rem;
  line-height: 1.4;
}

ul.entries .glyph {
  display: inline-block;
  width: 0.95em; height: 0.95em;
  margin-right: 0.5ch;
  vertical-align: middle;
}

/* each category carries its own icon */
ul.categories li {
  display: flex;
  align-items: center;
  gap: 0.7ch;
}
ul.categories .cat-icon {
  flex: none;
  width: 0.9em; height: 0.9em;
}
/* category names carry the same link styling as the newest list beside them:
   the base accent colour and persistent underline, no special casing. */
ul.categories .gloss {
  color: var(--muted);
  font-size: 0.92rem;
}

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

.site-foot {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  margin-top: 3.5rem;
}
.site-foot .foot-rule {
  flex: 1;
  height: 0;
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 0;
}
.site-foot .foot-logo {
  /* sized in rem here rather than em, since it has no surrounding text */
  width: 0.98rem; height: 0.98rem;
}

/* ---------------------------------------------- sub-page header + nav --- */

.site-head.sub {
  margin-bottom: 2.2rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--rule);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.4ch;
  color: var(--ink);
  font-size: 1.5rem;
  border-bottom: 0;
}
/* the brand mark is centred by the inline-flex row, matching the home title */
.brand .mark { width: 0.62em; height: 0.62em; }
.brand:hover { color: var(--ink); }

nav.cats {
  margin-top: 0.7rem;
  line-height: 1.9;
}
nav.cats a { color: var(--muted); border-bottom: 0; }
nav.cats a:hover { color: var(--accent-dim); }
nav.cats a.here { color: var(--accent); }
nav.cats a:not(:last-child)::after {
  content: "·";
  color: var(--rule);
  margin: 0 0.5rem;
}

/* ------------------------------------------------- category listings --- */

.cat-head { margin-bottom: 1.8rem; }
.cat-head h1 {
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  margin: 0 0 0.25rem;
}
.cat-desc {
  margin: 0;
  color: var(--muted);
  font-style: italic;
}

ul.listing { list-style: none; margin: 0; padding: 0; }
ul.listing li {
  display: flex;
  align-items: baseline;
  gap: 0.6ch;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
}
ul.listing .sum { color: var(--ink-soft); flex: 1; }
ul.listing time { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }

/* a listing whose rows are titled links (the blog feed): the link already
   carries its own underline, so the per-row rule would only double it. */
ul.listing.flat li { border-bottom: 0; padding: 0.35rem 0; }

.empty {
  color: var(--muted);
  font-style: italic;
  padding: 1.4rem 0;
}

/* ------------------------------------------------------- article page --- */

/* the article page is wider than the home measure, so sidenotes have a
   right-hand gutter to live in. header / footer widen to match, so the nav
   and the reading column share the same left edge. */
body.page-article .site-head,
body.page-article main,
body.page-article .site-foot { max-width: 52rem; }

.article > * { max-width: 38rem; }   /* the reading measure; notes escape right */

.article-head { max-width: 38rem; margin-bottom: 2.2rem; }
/* the crumb shares the section-label style above (same size, tracking,
   weight, colour), so TECHNICAL reads the same on every page it appears. */
.crumb {
  margin: 0 0 0.5rem;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.crumb a { color: var(--ink-soft); border-bottom: 0; }
.crumb a:hover { color: var(--accent); }
.article-head h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  letter-spacing: -0.01em;
  margin: 0 0 0.45rem;
}
.article-meta { margin: 0; color: var(--muted); font-style: italic; }

.article p {
  margin: 0 0 1.15rem;
  text-align: justify;
  hyphens: auto;
}
.article p.lead {
  font-size: 1.12rem;
  color: var(--ink-soft);
  font-style: italic;
  text-align: left;
  hyphens: none;
}
.article h2 {
  color: var(--ink);
  text-transform: none;
  letter-spacing: -0.005em;
  font-size: 1.55rem;
  font-weight: 700;
  margin: 2.4rem 0 0.8rem;
}

/* code */
.article :not(pre) > code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-inset);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
.article pre {
  max-width: 38rem;
  font-family: var(--mono);
  font-size: 0.9rem;
  line-height: 1.5;
  background: var(--bg-inset);
  padding: 1rem 1.1rem;
  border-radius: 4px;
  overflow-x: auto;
}

/* --- sidenotes: pure-CSS, click a marker to toggle --- */
.sn { }                       /* per-note wrapper: keeps toggles independent */
.sn-toggle { display: none; } /* the hidden checkbox */

.sn-marker {
  color: var(--accent);
  cursor: pointer;
  font-size: 0.9em;
  vertical-align: super;
  line-height: 0;
  /* a bigger, padded hit area so the marker is easy to tap, not a pinpoint */
  padding: 0.35em 0.4em;
  margin: 0 0.05em;
  border-radius: 3px;
  user-select: none;
  transition: background 120ms ease, color 120ms ease;
}
.sn-marker:hover {
  color: var(--accent-dim);
  background: var(--bg-inset);
}

.sidenote { display: none; }
.sn-toggle:checked ~ .sidenote {
  display: block;
  float: right;
  clear: right;
  width: 11rem;
  margin: 0.2rem -14rem 1rem 0;   /* push out into the right gutter */
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--ink-soft);
  text-align: left;
  hyphens: none;
}
.sidenote code { font-size: 0.85em; }

/* on narrow screens there is no gutter — reveal notes inline instead */
@media (max-width: 56rem) {
  .sn-toggle:checked ~ .sidenote {
    float: none;
    clear: none;
    width: auto;
    margin: 0.7rem 0;
    padding: 0.6rem 0.9rem;
    background: var(--bg-inset);
    border-left: 2px solid var(--accent);
    border-radius: 0 3px 3px 0;
  }
}

/* ------------------------------------------------ documentation hub --- */

/* the technical landing is a categorised directory of the stack, not a feed. */
.doc-group { margin: 0 0 2.4rem; }
.doc-group:last-of-type { margin-bottom: 0; }
/* dim the group label to --muted so it reads clearly as a quiet header over the
   brighter part links below, which otherwise sit too close to it in tone. */
.doc-group > h2 { margin-bottom: 0.4rem; color: var(--muted); }
.doc-group > .doc-desc {
  margin: 0 0 0.9rem;
  color: var(--muted);
  font-style: italic;
}

ul.doc-index { list-style: none; margin: 0; padding: 0; }
ul.doc-index li {
  display: flex;
  align-items: baseline;
  gap: 0.9ch;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--rule);
}
ul.doc-index a.part {
  flex: none;
  min-width: 6rem;
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: transparent;
}
ul.doc-index a.part:hover { color: var(--accent); border-bottom-color: currentColor; }
ul.doc-index .role { color: var(--ink-soft); }

/* bidirectional navigation: a "related" strip at the foot of each doc page. */
.related {
  margin-top: 2.6rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.95rem;
}
.related h2 {
  /* same style as every other section label; only the margin is its own */
  font-size: 0.98rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink-soft);
  margin: 0 0 0.6rem;
}
.related ul { list-style: none; margin: 0; padding: 0; }
.related li { display: inline; }
.related li:not(:last-child)::after {
  content: "·";
  color: var(--rule);
  margin: 0 0.5rem;
}

/* a vertical pipeline diagram (used on the coff page): stages as boxes,
   the data flowing between them as small arrow labels. plain HTML + CSS. */
.pipeline {
  margin: 1.4rem 0 1.6rem;
  max-width: 38rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.45;
}
.pipeline .pl-stage {
  /* a fixed width so every stage box is the same size; the widest label (the
     system assembler and linker) used to stretch its box past the others. */
  width: 18rem;
  max-width: 100%;
  padding: 0.45rem 1.1rem;
  text-align: center;
  border: 1px solid var(--muted);
  border-radius: 4px;
  background: var(--bg-inset);
  color: var(--ink);
}
/* a stage that is not coff's own (the system assembler and linker) */
.pipeline .pl-stage.pl-outside {
  border-style: dashed;
  color: var(--ink-soft);
}
.pipeline .pl-flow {
  padding: 0.3rem 0 0.3rem 1.4rem;
  color: var(--muted);
}
.pipeline .pl-flow .pl-what { color: var(--ink-soft); }
.pipeline .pl-io { color: var(--ink-soft); padding-left: 0.2rem; }

/* a command reference, as a definition list (used on the skalman page) */
dl.commands { margin: 0.6rem 0 1.15rem; }
dl.commands dt {
  font-family: var(--mono);
  font-size: 0.9em;
  font-weight: 700;
  color: var(--ink);
  margin-top: 1rem;
}
dl.commands dd {
  margin: 0.15rem 0 0;
  color: var(--ink-soft);
}

/* a screenshot, framed and captioned. the image is pixel art from the kernel's
   own framebuffer, so keep it crisp rather than letting the browser smooth it. */
figure.shot {
  margin: 1.6rem 0;
  max-width: 38rem;
}
figure.shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #000;
  image-rendering: pixelated;
}
figure.shot figcaption {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.88rem;
  font-style: italic;
}

/* an honest "still to be written" marker for pages that are stubs on purpose. */
.stub-note {
  margin: 1.4rem 0 0;
  padding: 0.7rem 0.95rem;
  background: var(--bg-inset);
  border-left: 2px solid var(--accent);
  border-radius: 0 3px 3px 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-style: italic;
}

/* ---------------------------------------------------- resources page --- */

.marks {
  display: flex;
  gap: 2.5rem;
  margin: 1.1rem 0 1.6rem;
}
.mark-cell { text-align: center; }
.mark-cell .glyph {
  display: block;
  font-size: 3.2rem;
  line-height: 1;
  color: var(--logo);
}
.mark-cell .label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0.6rem 0 1rem;
  max-width: 38rem;
}
.swatch { font-size: 0.8rem; color: var(--muted); }
.swatch .chip {
  display: block;
  width: 5rem;
  height: 3rem;
  margin-bottom: 0.4rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

/* licence options, as a tidy definition list */
dl.licences { margin: 0.6rem 0 1.15rem; }
dl.licences dt {
  font-weight: 700;
  color: var(--ink);
  margin-top: 1rem;
}
dl.licences dd {
  margin: 0.15rem 0 0;
  color: var(--ink-soft);
}

/* ----------------------------------------------------- releases page --- */

.release-card {
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.2rem 1.3rem;
  margin: 1.4rem 0 2rem;
  background: var(--bg-inset);
}
.release-card .rc-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6ch 1rem;
}
.release-card .rc-version {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink);
}
.release-card .rc-date { color: var(--muted); font-size: 0.9rem; }
/* the status note: quiet italic text, not a badge fighting the version for
   attention. */
.release-card .rc-status {
  margin-left: auto;
  font-style: italic;
  font-size: 0.9rem;
  color: var(--muted);
}
.release-card .rc-note { margin: 0.9rem 0 0; color: var(--ink-soft); }

.downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1rem 0 0;
}
.dl {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6ch;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--muted);
  font-size: 0.92rem;
  cursor: not-allowed;      /* nothing to download yet */
}
.dl .dl-kind { color: var(--ink-soft); font-weight: 700; }
.dl .dl-meta { font-size: 0.82rem; }

/* a download chip that actually goes somewhere (e.g. the source repository) */
a.dl {
  cursor: pointer;
  color: var(--muted);
}
a.dl:hover {
  color: var(--ink-soft);
  border-color: var(--muted);
}
a.dl::after { content: none; }   /* the chip itself signals enough; no ↗ */

ol.install {
  margin: 0.6rem 0 0;
  padding-left: 1.3rem;
  color: var(--ink-soft);
}
ol.install li { margin: 0 0 0.4rem; }

/* ------------------------------------------------------------- mobile --- */

@media (max-width: 34rem) {
  body { font-size: 18px; }
  .index { grid-template-columns: 1fr; gap: 1.8rem; }
  .about p { text-align: left; }
}