/* rules_rllvm — project site
 *
 * The palette, type and spacing are shared with the rllvm project site: the
 * two are siblings under one domain and reading as one system is the point.
 *
 * Cool ground, one warm accent. The accent marks exactly one idea: the single
 * module that comes out of a build. Nothing else borrows it.
 *
 * Monospace is reserved for machine text — labels, paths, code, target
 * patterns. It is never used to style a word that is merely prose.
 */

:root {
  --paper: #fafbfd;
  --raised: #f1f4f9;
  --ink: #0e1420;
  --muted: #59647a;
  --rule: #e2e7f0;
  --accent: #b26a00;
  --syn-comment: #6b7689;
  --syn-string: #0f766e;
  --syn-key: #6d28d9;

  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, "SF Mono",
    Menlo, Consolas, monospace;

  --measure: 68ch;
  --gutter: clamp(1.25rem, 5vw, 3.5rem);
  /* Keeps the measure honest on wide displays without centering the text. */
  --shelf: max(var(--gutter), (100% - 82rem) / 2);

  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper: #0b0f17;
  --raised: #131926;
  --ink: #e3e9f4;
  --muted: #8c97ac;
  --rule: #1e2635;
  --accent: #f0a202;
  --syn-comment: #6f7c92;
  --syn-string: #5eead4;
  --syn-key: #c4b5fd;

  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    --paper: #0b0f17;
    --raised: #131926;
    --ink: #e3e9f4;
    --muted: #8c97ac;
    --rule: #1e2635;
    --accent: #f0a202;
    --syn-comment: #6f7c92;
    --syn-string: #5eead4;
    --syn-key: #c4b5fd;

    color-scheme: dark;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, var(--muted) 55%, transparent);
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: var(--accent);
}

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

.skip {
  position: absolute;
  left: -9999px;
}

.skip:focus {
  left: var(--gutter);
  top: 0.75rem;
  z-index: 10;
  background: var(--paper);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
}

/* ---------- masthead ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.9rem;
  padding: 0.85rem var(--shelf);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(1.6) blur(12px);
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.version {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.05rem 0.5rem;
}

.masthead nav {
  margin-left: auto;
  min-width: 0;
  display: flex;
  gap: 1.1rem;
  font-size: 0.92rem;
}

.theme {
  font: inherit;
  font-size: 0.85rem;
  color: var(--muted);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
  cursor: pointer;
}

.theme:hover {
  color: var(--ink);
  border-color: var(--muted);
}

/* The row is the tightest thing on the page; shed the least useful parts
   before it wraps. Releases first, then the version. */
@media (max-width: 34rem) {
  .masthead nav a:nth-child(3) {
    display: none;
  }
}

@media (max-width: 26rem) {
  .version {
    display: none;
  }
}

/* ---------- hero ---------- */

.hero > * {
  min-width: 0;
}

.hero {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
  padding: clamp(3rem, 8vw, 5.5rem) var(--shelf) clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--rule);
}

@media (min-width: 60rem) {
  .hero {
    grid-template-columns: 1.05fr 0.95fr;
  }
}

.pitch h1 {
  margin: 0;
  font-size: clamp(1.75rem, 3.6vw, 2.3rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.022em;
  /* Wide for a display line, because the tagline is a full sentence carrying
     three rule names rather than a slogan. Narrower and it stacks five deep. */
  max-width: 30ch;
}

/* The rule names in the headline are machine text, so they are set as such.
   No chip or background: at this size the tint would read as a button. */
.pitch h1 code {
  font-family: var(--font-mono);
  font-size: 0.76em;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.lead {
  margin: 1.1rem 0 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: 1.05rem;
}

/* `width: fit-content` keeps the box hugging its contents the way a short
   shell command would; `max-width` stops the long dep line from widening the
   hero, and the code scrolls inside instead. */
.install {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: fit-content;
  max-width: 100%;
  margin-top: 1.9rem;
  padding: 0.55rem 0.6rem 0.55rem 0.95rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--raised);
}

.install code {
  font-family: var(--font-mono);
  font-size: 0.94rem;
  white-space: nowrap;
  /* `overflow-x` is what lets this shrink: a scroll container's automatic
     minimum size is zero, so the long dep line scrolls instead of widening
     the page on a phone. */
  overflow-x: auto;
  scrollbar-width: thin;
}

.install button {
  flex: none;
  font: inherit;
  font-size: 0.82rem;
  color: var(--muted);
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.2rem 0.6rem;
  cursor: pointer;
}

.install button:hover {
  color: var(--ink);
}

/* ---------- the graph ---------- */

/* The diamond from `examples/`. Each box is one aspect node: the target above,
   the module it merges from its own sources below. Both paths down the graph
   end at the same `lib_c` box, which is the whole reason the fixture is a
   diamond — depsets deduplicate, so `llvm-link` sees `lib_c.bc` once. */

.graph {
  margin: 0;
  max-width: min(30rem, 100%);
  font-family: var(--font-mono);
}

@media (min-width: 60rem) {
  .graph {
    padding-top: 0.7rem;
  }
}

.graph svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

/* Dashed, because these edges are declared during analysis and carry nothing
   until an output group asks for it. */
.graph .edges line {
  /* Not `--rule`: a hairline that reads fine as a border disappears as a
     diagonal, and in dark it vanished entirely against the ground. */
  stroke: color-mix(in srgb, var(--muted) 50%, transparent);
  stroke-width: 1.5;
  stroke-dasharray: 3 3;
  stroke-linecap: round;
}

.graph .node rect {
  fill: var(--raised);
  stroke: var(--rule);
  stroke-width: 1;
}

.graph text {
  font-family: var(--font-mono);
  text-anchor: middle;
}

.graph .target {
  fill: var(--ink);
  font-size: 13px;
}

.graph .bc {
  fill: var(--muted);
  font-size: 11px;
}

.graph .node,
.graph .edges {
  transform-box: fill-box;
  transform-origin: center;
  animation: enter 0.5s cubic-bezier(0.2, 0.7, 0.3, 1) both;
  animation-delay: calc(var(--i, 0) * 90ms);
}

.graph .edges {
  animation-duration: 0.7s;
  animation-delay: 150ms;
}

.graph figcaption {
  display: grid;
  gap: 0.25rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  animation: enter 0.6s cubic-bezier(0.2, 0.7, 0.3, 1) both;
  animation-delay: 420ms;
}

.graph .cmd {
  color: var(--muted);
  font-size: 0.84rem;
}

.graph .out {
  color: var(--accent);
  font-size: 1.2rem;
  font-weight: 500;
}

@keyframes enter {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}

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

  .graph .node,
  .graph .edges,
  .graph figcaption {
    animation: none;
  }
}

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

.shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3rem;
  padding: clamp(2.5rem, 6vw, 4rem) var(--shelf) 4rem;
}

@media (min-width: 74rem) {
  .shell {
    grid-template-columns: minmax(0, 1fr) 13rem;
  }

  .prose {
    grid-column: 1;
    grid-row: 1;
  }

  .rail {
    grid-column: 2;
    grid-row: 1;
  }
}

.prose,
.rail {
  min-width: 0;
}

/* Below the two-column breakpoint the rail has no column of its own, and in
   one column it lands above the first paragraph -- a table of contents ahead
   of any content it could refer to. */
@media (max-width: 73.999rem) {
  .rail {
    display: none;
  }
}

.rail nav {
  position: sticky;
  top: 5rem;
  display: grid;
  gap: 0.35rem;
  font-size: 0.88rem;
  border-left: 1px solid var(--rule);
  padding-left: 1rem;
}

.rail a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.05rem 0;
}

.rail a:hover,
.rail a[aria-current="true"] {
  color: var(--ink);
}

.rail a.sub {
  padding-left: 0.85rem;
  font-size: 0.84rem;
}

/* ---------- prose ---------- */

.prose {
  max-width: var(--measure);
}

.prose > * {
  margin-inline: 0;
}

.prose h2 {
  margin: 3.2rem 0 1rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--rule);
  font-size: clamp(1.4rem, 2.4vw, 1.75rem);
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.2;
}

.prose > h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.prose h3 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.prose p,
.prose ul,
.prose ol {
  margin: 0 0 1.1rem;
}

.prose li {
  margin-bottom: 0.45rem;
}

.prose li::marker {
  color: var(--muted);
}

.prose strong {
  font-weight: 600;
}

/* Tight horizontal padding: the prose ends sentences on a code span often
   enough that a roomier chip puts a visible gap before the full stop. */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--raised);
  border-radius: 4px;
  padding: 0.12em 0.26em;
}

.prose pre {
  margin: 0 0 1.4rem;
  padding: 1rem 1.15rem;
  background: var(--raised);
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: 1em;
}

.prose table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 0 0 1.4rem;
  font-size: 0.94rem;
}

.prose th,
.prose td {
  text-align: left;
  padding: 0.5rem 0.9rem 0.5rem 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

.prose th {
  font-weight: 600;
  white-space: nowrap;
}

.prose blockquote {
  margin: 0 0 1.2rem;
  padding-left: 1rem;
  border-left: 2px solid var(--rule);
  color: var(--muted);
}

.prose hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--rule);
}

/* Rouge, kept to three ideas: what is not code, what is text, what is named. */
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cd {
  color: var(--syn-comment);
  font-style: italic;
}

.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .se {
  color: var(--syn-string);
}

.highlight .k, .highlight .kd, .highlight .kn, .highlight .kr, .highlight .nb,
.highlight .nt {
  color: var(--syn-key);
}

.highlight .nv, .highlight .na, .highlight .no, .highlight .m, .highlight .mi {
  color: var(--accent);
}

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

footer {
  border-top: 1px solid var(--rule);
  padding: 2rem var(--shelf) 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

footer p {
  margin: 0;
  max-width: var(--measure);
}