/* Design system cloned from go.dev, with the Go teal swapped for ISO C++ blue. */

:root {
  --blue-dark: #00599c;
  --blue-light: #659ad2;

  --color-bg: #fff;
  --color-text: #202224;
  --color-text-subtle: #6e7072;
  --color-link: var(--blue-dark);
  --color-border: #c6c8ca;
  --color-code-bg: #f8f8f8;
  --color-code-comment: #3a6e11;
  --color-footer-bg: #f8f8f8;
}

[data-theme="dark"] {
  --color-bg: #202224;
  --color-text: #f0f1f2;
  --color-text-subtle: #c6c8ca;
  --color-link: var(--blue-light);
  --color-border: #414141;
  --color-code-bg: #2b2d2f;
  --color-code-comment: #5fda64;
  --color-footer-bg: #1b1d1f;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --color-bg: #202224;
    --color-text: #f0f1f2;
    --color-text-subtle: #c6c8ca;
    --color-link: var(--blue-light);
    --color-border: #414141;
    --color-code-bg: #2b2d2f;
    --color-code-comment: #5fda64;
    --color-footer-bg: #1b1d1f;
  }
}

* { box-sizing: border-box; }

html { height: 100%; }

body {
  margin: 0;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial,
    sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
  font-size: 1rem;
  line-height: 1.4;
  color: var(--color-text);
  background: var(--color-bg);
}

main { flex: 1; }

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

/* ---- Header ---- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg);
  border-bottom: 0.0625rem solid var(--color-border);
}

.header-inner {
  max-width: 75.75rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  color: var(--color-text);
}
.brand:hover { text-decoration: none; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.site-nav a {
  font-size: 0.875rem;
  color: var(--color-text);
}
.site-nav a:hover { color: var(--color-link); text-decoration: none; }

#theme-toggle {
  border: none;
  background: none;
  color: var(--color-text-subtle);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}
#theme-toggle:hover { color: var(--color-link); }

/* ---- Article ---- */

.article {
  max-width: 50rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.breadcrumb {
  font-size: 0.875rem;
  color: var(--color-text-subtle);
  margin-bottom: 0.25rem;
}
.breadcrumb span { margin: 0 0.25rem; }

h1 {
  font-size: 2.25rem;
  font-weight: 400;
  line-height: 1.15;
  margin: 0.5rem 0 1.25rem;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 1.75rem 0 0.5rem;
}

p, ul, ol { margin: 0.75rem 0; }
li { margin: 0.35rem 0; }

hr {
  border: none;
  border-top: 0.0625rem solid var(--color-border);
  margin: 2.5rem 0;
}

/* ---- Code ---- */

code, pre, kbd {
  font-family: SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
}

code { font-size: 0.875em; }

.code { margin: 1rem 0; }

.code .run {
  display: block;
  text-align: right;
  font-size: 0.75rem;
  margin-bottom: 0.25rem;
}

pre {
  position: relative;
  margin: 1rem 0;
  padding: 1.5rem;
  background: var(--color-code-bg);
  border: 0.0625rem solid var(--color-border);
  border-radius: 0.25rem;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.5;
}
.code pre { margin: 0; }
pre code { font-size: 100%; }

.copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font-size: 0.7rem;
  padding: 0.2rem 0.55rem;
  border: 0.0625rem solid var(--color-border);
  border-radius: 0.25rem;
  background: var(--color-bg);
  color: var(--color-text-subtle);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
}
pre:hover .copy, .copy:focus { opacity: 1; }

/* Minimal highlighting, matching go.dev's restraint: green comments,
   blue keywords, everything else plain. */
.hljs-comment, .hljs-quote { color: var(--color-code-comment); }
.hljs-keyword, .hljs-type, .hljs-built_in, .hljs-literal { color: var(--color-link); }

/* ---- Extras ---- */

.std {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--color-link);
  border: 0.0625rem solid currentColor;
  border-radius: 2rem;
  padding: 0 0.55rem;
  vertical-align: 0.15em;
  white-space: nowrap;
}

blockquote {
  margin: 1rem 0;
  padding: 0.75rem 1.25rem;
  border-left: 0.25rem solid var(--color-link);
  background: var(--color-code-bg);
}
blockquote p { margin: 0.25rem 0; }

table {
  border-collapse: collapse;
  margin: 1rem 0;
  width: 100%;
  font-size: 0.925rem;
}
th, td {
  border: 0.0625rem solid var(--color-border);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}
th { background: var(--color-code-bg); font-weight: 600; }

.next {
  margin-top: 3rem;
  text-align: right;
}

/* Landing page link lists, go.dev /doc/ style. */
.doc-list { list-style: none; padding: 0; }
.doc-list li { margin: 0.9rem 0; }
.doc-list li a { font-size: 1.05rem; }
.doc-list li p { margin: 0.15rem 0 0; color: var(--color-text-subtle); font-size: 0.925rem; }

/* ---- Footer ---- */

.site-footer {
  margin-top: 4rem;
  background: var(--color-footer-bg);
  border-top: 0.0625rem solid var(--color-border);
}

.footer-inner {
  max-width: 75.75rem;
  margin: 0 auto;
  padding: 2.5rem 1.5rem;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 2rem;
}

.footer-cols h4 {
  margin: 0 0 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
}
.footer-cols ul { list-style: none; margin: 0; padding: 0; }
.footer-cols li { margin: 0.4rem 0; }
.footer-cols a { color: var(--color-text-subtle); font-size: 0.875rem; }
.footer-cols a:hover { color: var(--color-link); }

.copyright {
  margin: 2rem 0 0;
  font-size: 0.8rem;
  color: var(--color-text-subtle);
}

@media (max-width: 37.5rem) {
  h1 { font-size: 1.75rem; }
  .article { padding-top: 1.25rem; }
  pre { padding: 1rem; }
}