/* Shared site chrome (header) used by every page: the landing page, the docs
   layout, and standalone pages. Relies on the design tokens (--ink, --gray,
   --line) declared in whichever base stylesheet the page also loads
   (home.css or style.css). Single source of truth so all headers match. */

:root {
  --header-h: 3.5rem;
  /* Full-width gutter and the site's only two font sizes (the hero title is
     the single exception). */
  --gutter: clamp(1.5rem, 4vw, 4rem);
  /* Full-bleed frame, but prose sits in a readable measure; wide elements
     (grids, tables, code) may run to --wide. */
  --measure: 42rem;
  --wide: 74rem;
  /* Landing/page content sits centered in this container (symmetric margins). */
  --container: 62rem;
  --fs-body: 1.25rem;
  --fs-head: 1.9rem;
  --fs-small: 1rem;
}
@media (max-width: 640px) {
  :root { --fs-body: 1.15rem; --fs-head: 1.55rem; }
}
/* Anchor jumps leave room for the sticky header. */
html { scroll-padding-top: calc(var(--header-h) + 1.5rem); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem var(--gutter);
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.site-header .brand {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  min-width: 0;
}
/* Compact Street Machine wordmark in the header: the same treatment as the hero
   (Candal italic ink "Super" with a hard red drop, Mr Dafoe coral script "Red"),
   scaled down and with the speed-line bars dropped so it sits on one line. */
.site-header .wordmark {
  position: relative;
  display: inline-block;
  text-decoration: none;
  white-space: nowrap;
  padding-right: 1.9em;   /* room for the tilted script tail */
  line-height: 1;
  transition: transform 200ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.site-header .wordmark:hover { transform: translateY(-1px); }
.site-header .wordmark .wm-red { transition: transform 260ms cubic-bezier(0.22, 0.61, 0.36, 1); }
.site-header .wordmark:hover .wm-red { transform: rotate(-12deg) scale(1.06); }
.site-header .wordmark .wm-super {
  font-family: "Candal", sans-serif;
  font-style: italic;
  font-weight: 400;
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-shadow: -2px 2px 0 #ed2121;
}
.site-header .wordmark .wm-red {
  position: absolute;
  right: 0;
  bottom: -0.14em;
  font-family: "Mr Dafoe", cursive;
  font-weight: 400;
  font-size: 1.55rem;
  color: #fc543e;
  transform: rotate(-12deg);
}
.site-header .tagline {
  color: var(--gray);
  font-size: var(--fs-body);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  font-size: var(--fs-body);
  white-space: nowrap;
}
.site-nav a {
  position: relative;
  color: var(--gray);
  text-decoration: none;
  transition: color 160ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
/* a red underline that wipes in from the left on hover / active */
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  background: #ed2121;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.site-nav a:hover { color: var(--ink); }
.site-nav a:hover::after,
.site-nav a.active::after { transform: scaleX(1); }
.site-nav a.active { color: var(--ink); }

/* GitHub icon link: an icon, not a word, so it aligns to the text baseline row
   and lifts instead of getting the text-underline wipe */
.site-nav a.nav-github {
  display: inline-flex;
  align-items: center;
  align-self: center;
  transition: color 160ms cubic-bezier(0.22, 0.61, 0.36, 1),
              transform 160ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.site-nav a.nav-github::after { content: none; }
.site-nav a.nav-github:hover { color: var(--ink); transform: translateY(-1px) scale(1.08); }
.site-nav a.nav-github svg { display: block; }
@media (prefers-reduced-motion: reduce) {
  .site-nav a::after { transition: none; }
}

/* On narrow screens drop the subtitle and stack the brand above the nav so
   the links never overflow. */
@media (max-width: 640px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  .site-header .tagline { display: none; }
  .site-nav { gap: 1rem 1.2rem; }
}

/* A section placed directly under the header (e.g. standalone pages) should
   not draw its own top rule against the header's bottom rule. */
.site-header + .section { border-top: none; }

/* ---- code blocks + syntax highlighting (shared across all pages) ---- */
.highlight { margin: 1.4rem 0; }
.highlight pre {
  margin: 0;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.85rem 1.05rem;
  overflow-x: auto;
}
.highlight code,
.highlight pre {
  font-family: var(--mono);
  font-size: var(--fs-small);
  line-height: 1.55;
}
/* Rouge tokens: muted, low-saturation to sit quietly under the serif type. */
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cs { color: #9aa0a6; font-style: italic; }
.highlight .k, .highlight .kn, .highlight .kc, .highlight .kd, .highlight .kr, .highlight .kt { color: #a13d6d; }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sc, .highlight .sd,
.highlight .se, .highlight .sh, .highlight .si, .highlight .sx, .highlight .sr, .highlight .ss { color: #3f7d3f; }
.highlight .mi, .highlight .mf, .highlight .mh, .highlight .mo, .highlight .il { color: #a35a00; }
.highlight .nf, .highlight .nb, .highlight .bp, .highlight .nc, .highlight .nn, .highlight .no { color: #2c5aa0; }
.highlight .nd, .highlight .ni { color: #a35a00; }
.highlight .o, .highlight .ow, .highlight .p { color: #5a5a5a; }
.highlight .n, .highlight .nx, .highlight .nv, .highlight .na { color: var(--ink); }


/* ---- footer (shared, on every page) ---- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.5rem var(--gutter) 3.5rem;
  display: flex;
  justify-content: center;
  color: var(--gray);
  font-size: var(--fs-body);
}
.site-footer .footer-heart {
  display: inline-block;
  color: #ed2121;
  margin: 0 0.15em;
  font-style: normal;
  animation: heart-beat 2.4s ease-in-out infinite;
}
@keyframes heart-beat {
  0%, 100% { transform: scale(1); }
  8%       { transform: scale(1.22); }
  16%      { transform: scale(1); }
  24%      { transform: scale(1.16); }
  32%      { transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .site-footer .footer-heart { animation: none; }
}
.site-footer a { color: var(--gray); text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

/* screen-reader-only text (the accessible "love" behind the heart glyph) */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---- lightbox: click a figure to zoom it full-screen (docs + landing) ---- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1rem, 4vw, 3rem);
  background: rgba(17, 17, 17, 0.82);
  opacity: 0;
  transition: opacity 160ms ease;
  cursor: zoom-out;
}
.lightbox.open { opacity: 1; }
.lightbox img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 6px;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.45);
  cursor: default;
}
@media (prefers-reduced-motion: reduce) { .lightbox { transition: none; } }