:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5d6470;
  --line: #e6e2d9;
  --accent: #d9481f;
  --accent-soft: #fbe6de;
  --yellow: #f3b61f;
  --blue: #2e86ab;
  --code-bg: #f4f1ea;
  --radius: 10px;
  --measure: 46rem;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141417;
    --surface: #1b1b20;
    --text: #e8e6e3;
    --muted: #a0a3ab;
    --line: #2c2c33;
    --accent: #ff7a50;
    --accent-soft: #3a211a;
    --code-bg: #1f1f25;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }

/* Header and footer */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .8rem clamp(1rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -.01em;
  text-decoration: none;
}

.site-nav { display: flex; gap: 1.4rem; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.site-nav a:hover { color: var(--text); }

.site-footer {
  margin-top: 5rem;
  padding: 2rem clamp(1rem, 4vw, 2.5rem);
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

/* Search */

.search { position: relative; flex: 1; min-width: 0; max-width: 26rem; margin: 0 auto 0 1.5rem; }
.search input {
  width: 100%;
  padding: .5rem 2.2rem .5rem .8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: .92rem;
}
.search input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
.search input::-webkit-search-cancel-button { display: none; }
.search kbd {
  position: absolute;
  right: .55rem;
  top: 50%;
  transform: translateY(-50%);
  padding: 0 .35rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
  font: .75rem/1.5 var(--mono);
  pointer-events: none;
}
.search input:focus + kbd { display: none; }
.search [role=listbox] {
  position: absolute;
  top: calc(100% + .4rem);
  left: 0;
  width: min(34rem, calc(100vw - 2rem));
  max-height: 70vh;
  overflow-y: auto;
  margin: 0;
  padding: .35rem;
  list-style: none;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .18);
}
.search [role=option] a { display: block; padding: .55rem .7rem; border-radius: 7px; color: var(--text); text-decoration: none; }
.search [role=option][aria-selected=true] a { background: var(--accent-soft); }
.result-title { display: block; font-weight: 600; font-size: .93rem; }
.result-section { display: block; color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; margin: .1rem 0 .2rem; }
.result-text { display: block; color: var(--muted); font-size: .86rem; line-height: 1.45; }
.result-text mark { background: none; color: var(--accent); font-weight: 600; }
.result-empty { padding: .7rem; color: var(--muted); font-size: .9rem; }

/* Home */

.home { max-width: 70rem; margin: 0 auto; padding: 0 clamp(1rem, 4vw, 2.5rem); }

.hero { padding: clamp(3rem, 9vw, 6rem) 0 3rem; max-width: 46rem; }
.hero h1 {
  margin: 1.2rem 0 1rem;
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -.03em;
}
.tagline { font-size: 1.15rem; color: var(--muted); max-width: 40rem; }

.logo { width: 72px; height: 72px; }
.tile { mix-blend-mode: multiply; }
.tile-a { fill: var(--accent); transform: rotate(-6deg); transform-origin: 31px 37px; }
.tile-b { fill: var(--yellow); transform: rotate(4deg); transform-origin: 62px 25px; }
.tile-c { fill: var(--blue); transform: rotate(-2deg); transform-origin: 58px 65px; }
@media (prefers-color-scheme: dark) { .tile { mix-blend-mode: screen; } }

.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 2rem 0 1.5rem; }
.button {
  display: inline-block;
  padding: .7rem 1.2rem;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}
.button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.button:hover { filter: brightness(1.05); }

.install {
  margin: 0;
  padding: 1rem 1.2rem;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
  font: .9rem/1.7 var(--mono);
}

.points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
  margin: 2rem 0 4rem;
}
.points article {
  padding: 1.4rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.points h2 { margin: 0 0 .5rem; font-size: 1.05rem; }
.points p { margin: 0; color: var(--muted); font-size: .95rem; }

.map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 2rem;
}
.map h2 {
  margin: 0 0 .6rem;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}
.map ul { list-style: none; margin: 0; padding: 0; }
.map li { padding: .45rem 0; border-bottom: 1px solid var(--line); }
.map li a { font-weight: 600; text-decoration: none; }
.map li span { display: block; color: var(--muted); font-size: .9rem; }

/* Documentation */

.docs {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr) 13rem;
  gap: clamp(1.5rem, 3vw, 3rem);
  max-width: 88rem;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 4vw, 2.5rem) 0;
}

.sidebar { position: sticky; top: 5rem; align-self: start; max-height: calc(100vh - 6rem); overflow-y: auto; }
.sidebar summary { display: none; }
.sidebar h2 {
  margin: 1.4rem 0 .4rem;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}
.sidebar section:first-child h2 { margin-top: 0; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar a {
  display: block;
  padding: .28rem .6rem;
  margin-left: -.6rem;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: .94rem;
}
.sidebar a:hover { background: var(--code-bg); }
.sidebar a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.doc { min-width: 0; max-width: var(--measure); }
.eyebrow {
  margin: 0;
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent);
  font-weight: 600;
}
.doc h1 { margin: .3rem 0 .6rem; font-size: clamp(2rem, 4vw, 2.6rem); line-height: 1.15; letter-spacing: -.02em; }
.lede { margin: 0 0 2rem; font-size: 1.15rem; color: var(--muted); }

.toc { position: sticky; top: 5rem; align-self: start; font-size: .88rem; }
.toc p { margin: 0 0 .5rem; font-weight: 600; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc li a { display: block; padding: .2rem 0 .2rem .8rem; color: var(--muted); text-decoration: none; }
.toc li.level-3 a { padding-left: 1.6rem; }
.toc li a:hover { color: var(--text); }

/* Prose */

.prose h2 { margin: 2.6rem 0 .8rem; font-size: 1.5rem; letter-spacing: -.01em; }
.prose h3 { margin: 2rem 0 .6rem; font-size: 1.15rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.1rem; }
.prose li { margin: .25rem 0; }
.prose code {
  padding: .12em .35em;
  background: var(--code-bg);
  border-radius: 5px;
  font: .88em var(--mono);
}
.prose pre {
  margin: 0 0 1.4rem;
  padding: 1rem 1.2rem;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
  font: .87rem/1.6 var(--mono);
}
.prose pre code { padding: 0; background: none; font: inherit; }
.prose blockquote {
  margin: 0 0 1.4rem;
  padding: .8rem 1.1rem;
  border-left: 3px solid var(--yellow);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.prose blockquote p:last-child { margin: 0; }
.prose table { width: 100%; margin: 0 0 1.4rem; border-collapse: collapse; font-size: .94rem; }
.prose th, .prose td { padding: .5rem .7rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.prose th { font-weight: 600; }
.prose h2 a, .prose h3 a { color: inherit; }

.reference {
  margin-top: 3rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.reference p { margin: 0 0 .6rem; font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.reference ul { display: flex; flex-wrap: wrap; gap: .45rem; margin: 0; padding: 0; list-style: none; }
.reference a { display: block; padding: .2rem .5rem; border: 1px solid var(--line); border-radius: 6px; background: var(--code-bg); text-decoration: none; }
.reference a:hover { border-color: var(--accent); }
.reference code { font: .82rem var(--mono); }

.reference + .pager { margin-top: 2rem; }

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.pager a {
  padding: .9rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
}
.pager a:hover { border-color: var(--accent); }
.pager span { display: block; color: var(--muted); font-size: .8rem; font-weight: 400; }
.pager .next { grid-column: 2; text-align: right; }

.not-found { max-width: var(--measure); margin: 0 auto; padding: 6rem clamp(1rem, 4vw, 2.5rem); }

/* Narrow screens */

@media (max-width: 72rem) {
  .docs { grid-template-columns: 14rem minmax(0, 1fr); }
  .toc { display: none; }
}

@media (max-width: 52rem) {
  .docs { grid-template-columns: minmax(0, 1fr); padding-top: 1rem; }
  .sidebar { position: static; max-height: none; border: 1px solid var(--line); border-radius: var(--radius); padding: .6rem 1rem; }
  .sidebar summary { display: list-item; cursor: pointer; font-weight: 600; }
  .sidebar:not([open]) nav { display: none; }
  .sidebar nav { margin-top: .8rem; }
  .site-nav { gap: 1rem; }
  .search { margin-left: .8rem; position: static; }
  .search kbd { display: none; }
  /* Under the whole header rather than under the box, which is too narrow. */
  .search [role=listbox] { top: 100%; left: .5rem; right: .5rem; width: auto; }
}

@media (max-width: 36rem) {
  .site-nav a[href*="pkg.go.dev"] { display: none; }
  .brand span { display: none; }
}