/* Shared style for darkmux.com/guide/ pages — first draft.
 * Matches the homepage (docs/index.html) visual language so the guide
 * doesn't feel like a different site. Adds guide-specific chrome:
 * top nav, page-nav (prev/next), TOC, and a callout style for the
 * frontier-config disclaimer.
 */

:root {
  --bg: #0a0a0b;
  --bg-elev: #131316;
  --border: #1f1f24;
  --text: #e8e6e3;
  --muted: #8a8a92;
  --accent: #6df1ff;
  --accent-dim: #2a8a96;
  --warn: #ffb86b;
  --good: #5af0a3;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
code, pre, .mono { font-family: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
.wrap { max-width: 820px; margin: 0 auto; padding: 0 24px; }

/* Top nav: brand + page breadcrumb */
.topnav {
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topnav .wrap { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.topnav .brand {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
}
.topnav .brand:hover { color: var(--accent); text-decoration: none; }
.topnav .crumbs {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  color: var(--muted);
}
.topnav .crumbs span { padding: 0 6px; color: var(--border); }
.topnav .links { margin-left: auto; display: flex; gap: 18px; font-size: 14px; }
.topnav .links a { color: var(--muted); }
.topnav .links a:hover { color: var(--accent); }
.topnav .links a.current { color: var(--text); }

/* Page header */
.page-head {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--border);
}
.page-head .label {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}
.page-head .label .dot { color: var(--accent); padding: 0 4px; }
.page-head h1 {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  line-height: 1.05;
}
.page-head .lede {
  font-size: 19px;
  color: var(--text);
  max-width: 680px;
  margin: 0;
}

/* Sections */
section { padding: 48px 0; border-bottom: 1px solid var(--border); }
section:last-of-type { border-bottom: none; }
h2 {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  font-weight: 500;
  margin: 0 0 24px;
}
h3 {
  font-size: 22px;
  font-weight: 600;
  margin: 32px 0 12px;
  letter-spacing: -0.01em;
}
h3:first-child { margin-top: 0; }
h4 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
  color: var(--text);
}
p { margin: 0 0 16px; color: var(--text); }
p.muted { color: var(--muted); }
ul, ol { margin: 0 0 16px; padding-left: 24px; }
li { margin-bottom: 6px; }
li code { color: var(--accent); }

/* Inline code + pre blocks */
code {
  font-size: 0.9em;
  background: var(--bg-elev);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--accent);
}
pre {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  font-size: 14px;
  overflow-x: auto;
  margin: 0 0 16px;
  color: var(--text);
  line-height: 1.55;
}
pre code {
  background: transparent;
  padding: 0;
  color: var(--text);
  font-size: 14px;
}
pre .prompt { color: var(--muted); user-select: none; }
pre .cmd { color: var(--accent); }
pre .comment { color: var(--muted); font-style: italic; }

/* Copy-to-clipboard button on code blocks (injected by copy.js). The button
   lives on a .code-wrap wrapper, not inside the scrolling <pre>, so it stays
   pinned to the visible top-right even when the block scrolls horizontally. */
.code-wrap { position: relative; }
.code-wrap .copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  cursor: pointer;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  font-family: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 11px;
  line-height: 1.4;
  padding: 2px 9px;
  opacity: 0.6;
  user-select: none;
  transition: opacity .12s, color .12s, border-color .12s, background .12s;
}
/* Resting opacity keeps it usable on touch (no hover); brightens on hover/focus. */
.code-wrap:hover .copy-btn,
.code-wrap .copy-btn:focus-visible { opacity: 1; }
.code-wrap .copy-btn:hover { color: var(--text); border-color: var(--accent); background: var(--bg-elev); }
.code-wrap .copy-btn.copied { color: var(--good); border-color: var(--good); opacity: 1; }

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 0 0 20px;
  font-size: 15px;
}
th, td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-weight: 600;
  border-bottom: 1px solid var(--accent-dim);
}

/* Callouts */
.callout {
  border-left: 3px solid var(--accent);
  background: rgba(109, 241, 255, 0.06);
  padding: 14px 18px;
  border-radius: 0 6px 6px 0;
  margin: 0 0 16px;
  font-size: 15px;
}
.callout strong { color: var(--accent); }
.callout.warn {
  border-left-color: var(--warn);
  background: rgba(255, 184, 107, 0.06);
}
.callout.warn strong { color: var(--warn); }
.callout.good {
  border-left-color: var(--good);
  background: rgba(90, 240, 163, 0.06);
}
.callout.good strong { color: var(--good); }

/* TOC on landing page */
.toc {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 0 0 24px;
}
.toc a {
  display: block;
  padding: 18px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
}
.toc a:hover {
  border-color: var(--accent);
  text-decoration: none;
}
.toc a .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 6px;
}
.toc a .title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 4px;
}
.toc a .desc {
  font-size: 14px;
  color: var(--muted);
}

/* Page nav (prev/next) at bottom of each guide page */
.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 32px 0 64px;
  border-top: 1px solid var(--border);
  margin-top: 32px;
}
.page-nav a {
  display: block;
  padding: 16px 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  flex: 1;
  max-width: 380px;
  color: var(--text);
}
.page-nav a:hover {
  border-color: var(--accent);
  text-decoration: none;
}
.page-nav .dir {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 4px;
}
.page-nav .title {
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
}
.page-nav a:hover .title { color: var(--accent); }
.page-nav .prev { text-align: left; }
.page-nav .next { text-align: right; margin-left: auto; }
.page-nav .empty { flex: 1; max-width: 380px; }

/* Footer */
footer {
  padding: 32px 0 48px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
}
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

/* ---- Mobile responsive — #635 phase 1 -----------------------------
   The guide CSS is already partially responsive (TOC uses
   `grid-template-columns: repeat(auto-fill, minmax(280px, 1fr))`; topnav
   `.wrap` has `flex-wrap: wrap`; `pre` has `overflow-x: auto`; `h1`
   uses `clamp()`). What's left are density/spacing concerns: section
   vertical padding is generous, the prev/next page-nav goes side-by-
   side on narrow viewports, lede font size is fixed at 19px regardless
   of width.

   This block targets phone-class viewports (~640px and below) and
   tightens spacing, stacks the page-nav vertically, and makes tables
   horizontally scrollable inside their container so wide env-var
   tables in the always-on-hub guide don't overflow the viewport. */
@media (max-width: 640px) {
  .wrap { padding: 0 18px; }

  /* Header tightens vertically but keeps the clamped h1 shape */
  .page-head { padding: 36px 0 24px; }
  .page-head .lede { font-size: 17px; }

  /* Body density */
  body { font-size: 15px; }
  section { padding: 32px 0; }
  h3 { font-size: 19px; margin: 24px 0 10px; }
  h4 { font-size: 16px; margin: 20px 0 8px; }

  /* Code block padding shrinks; line still scrolls horizontally for
     long commands via the desktop overflow-x rule */
  pre { padding: 12px 14px; font-size: 13px; }

  /* TOC cards already grid-auto-fill at 280px; tighten gap so they
     don't feel airy when stacked single-column */
  .toc { gap: 12px; }
  .toc a { padding: 14px 16px; }
  .toc a .title { font-size: 16px; }

  /* Tables scroll horizontally as a unit rather than overflow the
     viewport. The real <table> elements live in getting-started,
     missions, and observability (2-3 columns); always-on-hub's env-var
     content is <pre><code>, already handled by the desktop
     pre{overflow-x:auto} rule. */
  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    font-size: 14px;
  }

  /* Prev/next page-nav stacks; otherwise both cards squeeze to ~140px
     and the titles wrap awkwardly */
  .page-nav { flex-direction: column; gap: 12px; padding: 24px 0 48px; }
  .page-nav a { max-width: none; }
  .page-nav .next { text-align: left; margin-left: 0; }

  /* Topnav already wraps; tighten visual weight */
  .topnav { padding: 14px 0; }
  .topnav .links { gap: 12px; font-size: 13px; }

  footer { padding: 24px 0 36px; }
}