/* Nitro theme: racing/HUD style — saturated orange + cyan, console/HUD-style
   monospace display type, an orange racing-tab nav with a bezier clip-path,
   and a dark bezier banner. Follows prefers-color-scheme: the light scheme
   is a warm light-grey page, the dark scheme a deep violet page; the banner
   and other dark/bright elements carry over unchanged.

   Color model: the base stylesheet's variables carry the page; nitro adds
   a small set of theme-specific colors below, and everything else in the
   file references variables only, so recoloring happens here. */

:root {
  color-scheme: light dark;

  /* Page palette (base variables) */
  --bg: #eee;
  /* warm light grey page background */
  --surface: #fff;
  --text: #1a1a1a;
  --muted: #655f52;
  /* warm grey secondary text */
  --line: #1a1a1a1f;
  /* hairlines: tables, column rules */
  --accent: #ff6a00;
  /* racing orange: decorations, nav tab, markers */
  --accent2: #008ba3;
  /* deep cyan: h3, blockquote bar, nested markers */

  /* Nitro-specific colors */
  --orange-deep: #d95a00;
  /* orange dark enough for body text (h2, links) */
  --ink: #000;
  /* pure black details: tab text, brand shadow */
  --neon: #59ecff;
  /* glowing cyan: current page on the orange tab */
  --tab-current: #eee;
  --tab-hover: #fff;
  /* glowing white: nav hover (kept bright: the
                              nav glow is text-shadow, which fades dimmer) */
  --tab-muted: #0000008c;
  /* secondary labels on the orange tab */

  --font-body: var(--font-montserrat);
  --font-heading: var(--font-literata);
}

/* Dark scheme: same identity, but the page goes deep violet (never muddy
   near-black); the cyan and orange accents brighten to keep their punch. */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17141f;
    --surface: #231f2e;
    --text: #f0ede8;
    --muted: #a89f8f;
    --line: #ffffff22;
    --accent2: #2fc3dd;
    /* brighter cyan, readable on dark */
    --orange-deep: #ff8a3d;
    /* brighter orange, readable on dark */
    --code-bg: #12101b;
    /* code wells join the violet family */
  }
}

::selection {
  background: var(--accent);
  color: var(--ink);
}

/* Oversized outlined brand, spilling off the banner edge: orange stroke,
   solid black fill. */
#brand {
  font-size: 10rem;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--orange-deep);
  text-shadow: 0 0 0.1em black;
}

#nav {
  font-family: var(--font-heading);
  font-size: 0.95em;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  /* Racing tab: sitting at the bottom of the banner, with a bezier clip —
     slanted sides that join top and bottom horizontally, and a shallow
     wide notch at the top middle. Generous side padding so the em-based
     slants fit. The border-radius is the fallback for browsers without
     shape(). */
  background: var(--accent);
  width: fit-content;
  padding: 0.3em 2.5em 0;
  border-radius: 1.2em 1.2em 0 0;
  clip-path: shape(
      /* left side */
      from 0% 100%,
      curve to 2.5em 0 with 2em 100% / 1em 0,
      /* notch: ≈ golden-ratio width of the available top edge */
      hline to calc(19.1% + 1.7em),
      line to calc(19.1% + 2.1em) 0.2em,
      hline to calc(80.9% - 2.1em),
      line to calc(80.9% - 1.7em) 0,
      /* right side, bottom */
      hline to calc(100% - 2.5em),
      curve to 100% 100% with calc(100% - 1em) 0 / calc(100% - 2em) 100%,
      close);
}

#nav a {
  color: var(--ink);
}

/* Current page and hover glow on the orange tab; both stay bright colors
   because the glow is text-shadow. */
#nav .current {
  color: var(--tab-current);
  text-shadow: 0 0 0.1em;
}

#nav a:hover {
  color: var(--tab-hover);
  text-shadow: 0 0 0.1em;
}

#nav span {
  color: var(--tab-muted);
}

/* Console-style headings: uppercase monospace. h1 in the page text color
   with a hazard-stripe underline, h2 deep orange, h3 cyan. */
article h1,
article h2,
article h3 {
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

article h1 {
  color: var(--text);
  font-weight: 700;
  padding-bottom: 0.5rem;
  /* The hazard-stripe underline breaks out of the page box: the negative
     right margin extends the h1's box (and thus its background) all the
     way to the viewport's right edge. */
  margin-right: calc((100% - 100vw) / 2);
  background:
    linear-gradient(-55deg,
      transparent 0 0.2rem,
      var(--accent) 0.2rem 0.9rem,
      transparent 0.9rem 1.4rem) -0.2rem bottom / 1.4rem 4px repeat-x;
}

article h2 {
  color: var(--orange-deep);
  font-weight: 700;
}

article h3 {
  color: var(--accent2);
  font-weight: 700;
}

article a:hover {
  color: var(--accent2);
  text-decoration: none;
}

/* Chevron markers instead of the base emoji diamonds. */
article ul li::before {
  content: "»";
  color: var(--accent);
  font-weight: 700;
}

article ul ul li::before {
  content: "›";
  color: var(--accent2);
}

article ul ul ul li::before {
  content: "»";
  color: var(--accent);
}

blockquote {
  border-left-color: var(--accent2);
  background: color-mix(in oklab, var(--accent2) 6%, transparent);
  padding: 0.25rem 0.75rem;
  /* Keep the quoted text on the paragraph edge: the tinted box extends
     past it by its own border/padding, like code blocks. */
  margin: 0 -0.75rem 1rem -1rem;
}

/* Code follows the color scheme; the dark-scheme well joins the violet
   family (--code-bg above). The orange side bar stays in both. */
pre {
  border-left: 0.25rem solid var(--accent);
  /* Text on the paragraph edge: the box extends by padding + border. */
  margin-left: calc(-0.8rem - 0.25rem);
  border-radius: 3px;
}

img {
  border-radius: 3px;
}

::view-transition {
  background: var(--bg);
}