/* ABOUTME: Stylesheet for devwiki with sidebar nav on desktop and select dropdown on mobile. */
/* ABOUTME: Uses CSS Grid layout, system fonts, prose typography, and dark mode support. */

/*
  HTML structure reference:

  body.page.page--{slug}
    div.layout
      header.site-header
        a.site-header__logo
      nav.site-nav[#site-nav]
        ul.site-nav__list                      (desktop: vertical sidebar)
          li.site-nav__item                    (leaf page)
            a.site-nav__link
          li.site-nav__group                   (folder section)
            details[open]                      (auto-opened when active page is inside)
              summary.site-nav__summary
                a.site-nav__link | span.site-nav__label
              ul.site-nav__list--nested        (child pages)
                li.site-nav__item …
        select.site-nav__select                (mobile: dropdown)
      main.main-content[#main-content]
        article.prose
        footer.page-footer
          p.page-footer__meta
            time

  Layout:
    Desktop (>768px): grid with sidebar nav + content
    Mobile  (≤768px): stacked, nav rendered as a <select>
*/

/* ─── Reset & Base ────────────────────────────────────────────────────────── */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
    sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 1rem;
  line-height: 1.6;
  color: #1a1a1a;
  background: #fff;
}

/* ─── Layout ──────────────────────────────────────────────────────────────── */

.layout {
  display: grid;
  grid-template-columns: 180px 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas:
    "header  header"
    "nav     content";
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  gap: 0 2rem;
}

/* ─── Header ──────────────────────────────────────────────────────────────── */

.site-header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-bottom: 0.75rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid #e0e0e0;
}

.site-header__logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: #1a1a1a;
  text-decoration: none;
}

.site-header__ascii {
  font-family:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: 1.2rem;
  line-height: 1;
  margin: 0;
  color: inherit;
  background: none;
  overflow: hidden;
}


/* ─── Navigation ──────────────────────────────────────────────────────────── */

.site-nav {
  grid-area: nav;
  padding-top: 0.25rem;
}

.site-nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  position: sticky;
  top: 1.5rem;
}

.site-nav__link {
  color: #555;
  text-decoration: none;
  font-size: 0.9rem;
}

.site-nav__link:hover {
  color: #1a1a1a;
  text-decoration: underline;
}

.site-nav__item--active .site-nav__link {
  color: #1a1a1a;
  font-weight: 600;
}

/* Hidden on desktop, shown on mobile */
.site-nav__select {
  display: none;
}

/* ─── Nested Navigation (folder sections) ────────────────────────────────── */

.site-nav__list--nested {
  list-style: none;
  padding-left: 0.75rem;
  margin-top: 0.15rem;
}

.site-nav__group {
  list-style: none;
}

.site-nav__summary {
  cursor: pointer;
  font-size: 0.9rem;
  color: #555;
}

.site-nav__link--active {
  color: #1a1a1a;
  font-weight: 600;
}

.site-nav__label {
  font-size: 0.9rem;
  color: #555;
  user-select: none;
}

.site-nav__group--contains-active > details > .site-nav__summary .site-nav__label {
  color: #1a1a1a;
  font-weight: 500;
}

.main-content {
  grid-area: content;
  min-width: 0;
}

/* ─── Prose ───────────────────────────────────────────────────────────────── */

.prose h1,
.prose h2,
.prose h3,
.prose h4 {
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  line-height: 1.3;
  color: #111;
}

.prose h1 {
  font-size: 1.6rem;
  margin-top: 0;
}
.prose h2 {
  font-size: 1.3rem;
}
.prose h3 {
  font-size: 1.1rem;
}
.prose h4 {
  font-size: 1rem;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose pre,
.prose table {
  margin-bottom: 1rem;
}

.prose a {
  color: #0969da;
  text-decoration: none;
}

.prose a:hover {
  text-decoration: underline;
}

.prose ul,
.prose ol {
  padding-left: 1.5rem;
}

.prose li + li {
  margin-top: 0.25rem;
}

.prose blockquote {
  border-left: 3px solid #d0d0d0;
  padding-left: 1rem;
  color: #555;
}

.prose code {
  font-family:
    ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono",
    monospace;
  font-size: 0.875em;
  background: #f5f5f5;
  padding: 0.15em 0.35em;
  border-radius: 3px;
}

.prose pre {
  background: #f5f5f5;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
}

.prose th,
.prose td {
  text-align: left;
  padding: 0.5rem 0.75rem;
  border: 1px solid #e0e0e0;
}

.prose th {
  background: #f9f9f9;
  font-weight: 600;
}

.prose hr {
  border: none;
  border-top: 1px solid #e0e0e0;
  margin: 2rem 0;
}

.prose img {
  max-width: 100%;
  height: auto;
}

/* ─── Outliner (collapsible headings) ─────────────────────────────────────── */

.prose .outline {
  border: none;
  margin-top: 1.75rem;
  padding: 0;
}

.prose .outline:first-of-type {
  margin-top: 1rem;
}

.prose .outline__heading {
  cursor: pointer;
}

.prose .outline__heading h2,
.prose .outline__heading h3 {
  display: inline;
  margin: 0;
}

.prose .outline--nested {
  margin-top: 1rem;
  padding-left: 0.75rem;
}

/* ─── Footer ──────────────────────────────────────────────────────────────── */

.page-footer {
  margin-top: 2.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid #e0e0e0;
}

.page-footer__meta {
  font-size: 0.8rem;
  color: #888;
}

/* ─── Mobile ──────────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .layout {
    display: block;
    padding: 1rem;
  }

  .site-nav {
    margin-bottom: 1rem;
  }

  .site-nav__list {
    display: none;
  }

  .site-nav__select {
    display: block;
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    font-family: inherit;
    color: inherit;
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    cursor: pointer;
    appearance: auto;
  }

  .prose h1 {
    font-size: 1.4rem;
  }
  .prose h2 {
    font-size: 1.15rem;
  }
}

/* ─── Dark Mode (follows OS preference) ──────────────────────────────────── */

@media (prefers-color-scheme: dark) {
  body {
    color: #e0e0e0;
    background: #1a1a1a;
  }

  .site-header {
    border-bottom-color: #333;
  }

  .site-header__logo {
    color: #e0e0e0;
  }

  .site-nav__select {
    background: #2a2a2a;
    color: #e0e0e0;
    border-color: #444;
  }

  .site-nav__link {
    color: #999;
  }

  .site-nav__link:hover {
    color: #e0e0e0;
  }

  .site-nav__item--active .site-nav__link {
    color: #e0e0e0;
  }

  .site-nav__summary {
    color: #999;
  }

  .site-nav__link--active {
    color: #e0e0e0;
  }

  .site-nav__label {
    color: #999;
  }

  .site-nav__group--contains-active > details > .site-nav__summary .site-nav__label {
    color: #e0e0e0;
  }

  .prose h1,
  .prose h2,
  .prose h3,
  .prose h4 {
    color: #f0f0f0;
  }

  .prose a {
    color: #58a6ff;
  }

  .prose blockquote {
    border-left-color: #444;
    color: #999;
  }

  .prose code {
    background: #2a2a2a;
  }

  .prose pre {
    background: #2a2a2a;
  }

  .prose th,
  .prose td {
    border-color: #333;
  }

  .prose th {
    background: #252525;
  }

  .prose hr {
    border-top-color: #333;
  }

  .page-footer {
    border-top-color: #333;
  }

  .page-footer__meta {
    color: #666;
  }
}