/* ==========================================================================
   chrome.css — the one header and the one footer
   --------------------------------------------------------------------------
   Stamped into every native page by scripts/gen-chrome.mjs (and into the
   mirrored lab pages by scripts/mirror-pull.mjs). This file is furniture, not
   a hero: a slim static bar at the top, three short lines at the bottom.

   Self-contained on purpose. It reads the site tokens when a page loads
   /css/tokens.css and falls back to the same bark-and-parchment values when a
   page paints its own palette (leanto, windowsill, the microtubule pages).
   Every var() below carries a hard fallback; nothing here depends on any other
   stylesheet. Both themes are the site's dark bark — the bar looks the same
   over a parchment page (leanto) as over a bark one.
   ========================================================================== */

/* The two faces, in case the page did not bring them. Same files tokens.css
   declares; a duplicate @font-face for the same descriptors is a no-op. */
@font-face {
  font-family: 'Fraunces';
  font-style: normal;
  font-weight: 300 900;
  font-display: swap;
  src: url('/fonts/fraunces-normal-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url('/fonts/jetbrainsmono-normal-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

.bb-chrome,
.bb-foot {
  /* palette — tokens if present, bark if not */
  --bb-bg: var(--color-bg, #1c1510);
  --bb-bg-2: var(--color-bg-elevated, #241b13);
  --bb-border: var(--color-border, #3a2f26);
  --bb-text: var(--color-text, #ece1cc);
  --bb-dim: var(--color-text-secondary, #b8a98c);
  --bb-muted: var(--color-text-muted, #a0926f);
  --bb-brass: var(--color-brass, #c9a86a);
  --bb-ember: var(--color-ember, #e8833a);
  --bb-gold: var(--color-accent, #d9a441);
  --bb-mono: var(--font-mono, 'JetBrains Mono', 'Fira Code', 'Consolas', monospace);
  --bb-serif: var(--font-serif, 'Fraunces', Georgia, serif);
  --bb-h: 52px;
  --bb-gutter: clamp(16px, 4vw, 28px);
  --bb-max: 1100px;

  box-sizing: border-box;
  width: 100%;
  margin: 0;
  color: var(--bb-dim);
  background: var(--bb-bg);
  font-family: var(--bb-mono);
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}
.bb-chrome *,
.bb-foot * { box-sizing: border-box; }

/* --------------------------------------------------------------------------
   Header — a slim static bar. Not fixed: it never covers a page's hero art.
   -------------------------------------------------------------------------- */
.bb-chrome {
  position: relative;
  z-index: 20;               /* over lamplight (0) / motes (1) / leanto's workbench (8) */
  border-bottom: 1px solid var(--bb-border);
}
.bb-chrome-inner {
  max-width: var(--bb-max);
  min-height: var(--bb-h);
  margin: 0 auto;
  padding: 0 var(--bb-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

/* Wordmark — Fraunces, the way the homepage and the dossier set it:
   brass mark, parchment word, ember "branch". */
.bb-wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45em;
  margin: 0;
  padding: 0;
  font-family: var(--bb-serif);
  font-size: 15px;
  font-weight: 560;
  letter-spacing: 0.01em;
  color: var(--bb-dim);
  text-decoration: none;
  white-space: nowrap;
}
.bb-wordmark-mark { color: var(--bb-brass); font-weight: 400; }
.bb-wordmark-lit { color: var(--bb-ember); }
.bb-wordmark:hover .bb-wordmark-mark { color: var(--bb-gold); }
.bb-wordmark:hover { color: var(--bb-text); }

/* Nav — four routes, mono, quiet. */
.bb-nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 28px);
  margin: 0;
  padding: 0;
  list-style: none;
}
.bb-nav li { margin: 0; padding: 0; }
.bb-nav a,
.bb-search {
  display: inline-block;
  padding: 6px 0;
  font-family: var(--bb-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bb-dim);
  text-decoration: none;
  border: 0;
  border-bottom: 1px solid transparent;
  background: none;
  cursor: pointer;
  transition: color 150ms ease, border-color 150ms ease;
}
.bb-nav a:hover,
.bb-search:hover { color: var(--bb-ember); }
.bb-nav a[aria-current="page"] {
  color: var(--bb-brass);
  border-bottom-color: var(--bb-brass);
}
.bb-nav a:focus-visible,
.bb-search:focus-visible,
.bb-wordmark:focus-visible,
.bb-nav-toggle:focus-visible,
.bb-foot a:focus-visible {
  outline: 2px solid var(--bb-gold);
  outline-offset: 2px;
  border-radius: 3px;
}

/* Search — only present on pages that load the command palette. */
.bb-search { display: inline-flex; align-items: center; gap: 8px; }
.bb-search kbd {
  font-family: inherit;
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: none;
  color: var(--bb-muted);
  border: 1px solid var(--bb-border);
  border-radius: 3px;
  padding: 1px 5px;
}
.bb-search kbd:empty { display: none; }

/* Mobile toggle — hidden until the bar is too narrow for the four words. */
.bb-nav-toggle {
  display: none;
  margin: 0;
  padding: 6px 10px;
  font-family: var(--bb-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bb-dim);
  background: none;
  border: 1px solid var(--bb-border);
  border-radius: 4px;
  cursor: pointer;
}
.bb-nav-toggle:hover { color: var(--bb-text); border-color: var(--bb-brass); }
.bb-nav-toggle[aria-expanded="true"] { color: var(--bb-brass); border-color: var(--bb-brass); }

@media (max-width: 639.98px) {
  .bb-nav-toggle { display: inline-block; }
  /* The menu drops over the page instead of pushing it: the bar keeps its
     height, so a full-viewport page (leanto) never reflows underneath. */
  .bb-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--bb-gutter) 14px;
    background: var(--bb-bg-2);
    border-bottom: 1px solid var(--bb-border);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
  }
  .bb-chrome[data-open="true"] .bb-nav { display: flex; }
  .bb-nav a,
  .bb-search {
    display: block;
    width: 100%;
    padding: 12px 0;
    text-align: left;
    border-bottom: 1px solid var(--bb-border);
  }
  .bb-nav li:last-child a,
  .bb-nav li:last-child .bb-search { border-bottom-color: transparent; }
  .bb-nav a[aria-current="page"] { border-bottom-color: var(--bb-border); }
  .bb-search kbd { display: none; }
}

/* --------------------------------------------------------------------------
   Footer — three short lines.
   -------------------------------------------------------------------------- */
.bb-foot {
  position: relative;
  z-index: 2;
  margin-top: 48px;
  border-top: 1px solid var(--bb-border);
}
.bb-foot-inner {
  max-width: var(--bb-max);
  margin: 0 auto;
  padding: 26px var(--bb-gutter) 34px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
}
.bb-foot p { margin: 0; padding: 0; font-size: 11px; letter-spacing: 0.1em; }
.bb-foot-name { color: var(--bb-text); text-transform: uppercase; }
.bb-foot-links { color: var(--bb-muted); overflow-wrap: anywhere; }
.bb-foot-links a { color: var(--bb-dim); text-decoration: none; padding: 4px 2px; }
.bb-foot-links a:hover { color: var(--bb-ember); }
.bb-foot-colophon { color: var(--bb-muted); font-family: var(--bb-serif); font-style: italic; font-size: 13px; letter-spacing: 0; }

@media (prefers-reduced-motion: reduce) {
  .bb-chrome *, .bb-foot * { transition: none !important; }
}