/* The site's single stylesheet: layout (fixed sidebar + content pane), markdown styling, and the
 * Rouge highlight palette. Colors live in custom properties so the dark scheme below redefines
 * only the palette, never the rules. Teal accent matches the social card and docs badge. */

:root {
  --bg: #ffffff;
  --bg-sidebar: #f6f8fa;
  --fg: #1f2328;
  --fg-muted: #59636e;
  --accent: #0d9488;
  --accent-soft: #2dd4bf;
  --accent-sub: #0f766e;
  --border: #d1d9e0;
  --code-bg: #f6f8fa;
  --code-fg: #1f2328;
  --link: #0969da;
  --hl-comment: #6a737d;
  --hl-keyword: #cf222e;
  --hl-string: #0a3069;
  --hl-number: #0550ae;
  --hl-type: #953800;
  --hl-func: #8250df;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-sidebar: #010409;
    --fg: #e6edf3;
    --fg-muted: #8b949e;
    --accent: #2dd4bf;
    --accent-soft: #2dd4bf;
    --accent-sub: #1eb8a5;
    --border: #30363d;
    --code-bg: #161b22;
    --code-fg: #e6edf3;
    --link: #58a6ff;
    --hl-comment: #8b949e;
    --hl-keyword: #ff7b72;
    --hl-string: #a5d6ff;
    --hl-number: #79c0ff;
    --hl-type: #ffa657;
    --hl-func: #d2a8ff;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

/* ---- sidebar ---------------------------------------------------------- */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 17rem;
  overflow-y: auto;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 1.25rem 0 1rem;
  display: flex;
  flex-direction: column;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 20;
  background: var(--accent);
  color: #0d1117;
  padding: 0.5rem 1rem;
  text-decoration: none;
}

.skip-link:focus { left: 0; }

.site-head {
  padding: 0 1.25rem 0.9rem;
  border-bottom: 1px solid var(--border);
}

.site-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
}

.site-mark {
  vertical-align: -0.15em;
  margin-right: 0.45rem;
}

.site-sub {
  /* the wire-bytes motif from the social card, as a subtle subtitle */
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.62rem;
  color: var(--accent-sub);
  margin-top: 0.25rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
}

.nav-list {
  list-style: none;
  margin: 0.75rem 0;
  padding: 0;
  flex: 1;
}

.nav-list a {
  display: block;
  padding: 0.32rem 1.25rem;
  color: var(--fg-muted);
  text-decoration: none;
  border-left: 3px solid transparent;
}

.nav-list a:hover { color: var(--fg); }

.nav-list a.current {
  color: var(--fg);
  font-weight: 600;
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.sidebar-footer {
  padding: 0.9rem 1.25rem 0;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 1rem;
}

.sidebar-footer a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.85rem;
}

.sidebar-footer a:hover { color: var(--fg); }

/* ---- content pane ----------------------------------------------------- */

.content {
  margin-left: 17rem;
  display: flex;
  justify-content: center;
}

.page {
  max-width: 50rem;
  min-width: 0;
  padding: 2.5rem 3rem 4rem;
}

.content h1, .content h2, .content h3, .content h4 {
  line-height: 1.25;
  margin: 1.6em 0 0.6em;
  scroll-margin-top: 1rem;
}

.content h1 { font-size: 1.9rem; margin-top: 0.2em; }
.content h2 { font-size: 1.45rem; border-bottom: 1px solid var(--border); padding-bottom: 0.25em; }
.content h3 { font-size: 1.15rem; }
.content h4 { font-size: 1rem; }

/* Underlined faintly even at rest: in dark mode the link blue sits under 3:1 against body text,
 * so color alone must not be the only cue (WCAG 1.4.1). */
.content a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--link) 40%, transparent);
  text-underline-offset: 3px;
}

.content a:hover { text-decoration-color: var(--link); }

.content hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

.content blockquote {
  margin: 1rem 0;
  padding: 0.1rem 1rem;
  color: var(--fg-muted);
  border-left: 4px solid var(--accent-soft);
  background: color-mix(in srgb, var(--accent) 5%, transparent);
  border-radius: 0 4px 4px 0;
}

.content img { max-width: 100%; }

/* badges in the README render as a row of images */
.content p img { vertical-align: middle; }

/* ---- code ------------------------------------------------------------- */

code, pre {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.875em;
}

code {
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
  overflow-wrap: anywhere;  /* a long identifier in prose must wrap, not scroll the page */
}

pre {
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 0.9rem 1.1rem;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
  border: 1px solid var(--border);
}

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

/* Rouge token classes (kramdown/GFM emits these) */
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cp, .highlight .cpf { color: var(--hl-comment); }
.highlight .k, .highlight .kd, .highlight .kr, .highlight .kn { color: var(--hl-keyword); }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .se { color: var(--hl-string); }
.highlight .m, .highlight .mi, .highlight .mf, .highlight .mh { color: var(--hl-number); }
.highlight .sc { color: var(--hl-string); }
.highlight .nv { color: var(--hl-number); }
.highlight .kt, .highlight .nc, .highlight .nn, .highlight .nt, .highlight .na { color: var(--hl-type); }
.highlight .nb, .highlight .nl { color: var(--hl-keyword); }
.highlight .nf, .highlight .fm { color: var(--hl-func); }

/* ---- tables ----------------------------------------------------------- */

.content table {
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
  margin: 1rem 0;
}

.content th, .content td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.8rem;
  text-align: left;
}

.content th { background: var(--code-bg); }

.content tr:nth-child(2n) td { background: color-mix(in srgb, var(--code-bg) 55%, transparent); }

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

.sidebar-toggle-box { display: none; }
.sidebar-toggle { display: none; }

@media (max-width: 56rem) {
  .sidebar {
    transform: translateX(-100%);
    visibility: hidden;  /* keep the closed sidebar's links out of the tab order */
    transition: transform 0.2s ease, visibility 0.2s;
    z-index: 10;
    width: 15rem;
    padding-top: 3.2rem;  /* clear the toggle button when open */
  }

  /* Visually hidden but focusable, so the toggle is keyboard-reachable (display:none would
   * remove it from the tab order entirely). */
  .sidebar-toggle-box {
    display: block;
    position: fixed;
    top: 0.6rem;
    left: 0.8rem;
    width: 2.4rem;
    height: 2.2rem;
    margin: 0;
    opacity: 0;
    z-index: 12;
  }

  .sidebar-toggle {
    display: block;
    position: fixed;
    top: 0.6rem;
    left: 0.8rem;
    z-index: 11;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--fg);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.1rem 0.5rem;
    user-select: none;
  }

  .sidebar-toggle-box:focus-visible ~ .sidebar-toggle {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }

  .sidebar-toggle-box:checked ~ .sidebar {
    transform: translateX(0);
    visibility: visible;
  }

  .content { margin-left: 0; }

  .page { padding: 3.5rem 1.25rem 3rem; }
}

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

  .sidebar { transition: none; }
}