/* ==========================================================================
   Vitruvius — Art Deco ("Gatsby") system
   --------------------------------------------------------------------------
   One stylesheet, one token block. Every colour, space, border and glow comes
   from :root; no page carries an inline style (tests/site/test-site.mjs fails
   if one appears). Geometry is sharp by design — radius is 0 everywhere.
   ========================================================================== */

/* --- self-hosted faces ---------------------------------------------------- */
@font-face {
  font-family: "Marcellus";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/marcellus-latin.woff2") format("woff2");
}
@font-face {
  font-family: "Josefin Sans";
  font-style: normal;
  font-weight: 300 600;
  font-display: swap;
  src: url("../fonts/josefin-sans-latin.woff2") format("woff2");
}

/* --- tokens --------------------------------------------------------------- */
:root {
  /* palette */
  --bg: #0a0a0a;
  --card: #141414;
  --card-hi: #1a1a1a;
  --fg: #f2f0e4;
  --muted: #8f8f8f;
  --gold: #d4af37;
  --gold-bright: #f2e8c4;
  --gold-deep: #a8862a;
  --blue: #1e3d59;

  /* lines & glows */
  --line: rgba(212, 175, 55, 0.28);
  --line-strong: rgba(212, 175, 55, 0.65);
  --glow: 0 0 15px rgba(212, 175, 55, 0.2);
  --glow-strong: 0 0 24px rgba(212, 175, 55, 0.4);
  --hairline: rgba(242, 240, 228, 0.08);

  /* type */
  --display: "Marcellus", "Times New Roman", serif;
  --body: "Josefin Sans", system-ui, -apple-system, sans-serif;
  --track-wide: 0.18em;
  --track-mid: 0.1em;

  /* space & measure */
  --shell: 68rem;
  --pad: clamp(1.25rem, 4vw, 2rem);
  --section-y: clamp(4.5rem, 10vw, 8rem);

  /* motion */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 320ms;
  --dur-slow: 520ms;
}

/* --- reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--body);
  font-weight: 300;
  font-size: 1.0625rem;
  line-height: 1.7;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4 { margin: 0; font-family: var(--display); font-weight: 400; line-height: 1.08; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

/* --- background motifs ---------------------------------------------------- */
/* Diagonal cross-hatch, multi-angle like an engraved plate, at ~5% gold —
   fine hairlines plus faint vertical ruling rather than a single grid. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(45deg, rgba(212, 175, 55, 0.05) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(-45deg, rgba(212, 175, 55, 0.038) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(242, 240, 228, 0.02) 0 1px, transparent 1px 68px);
}
/* A soft vignette keeps the ornament from fighting the text. */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(120% 80% at 50% 0%, transparent 40%, rgba(0, 0, 0, 0.65) 100%);
}

/* --- shared primitives ---------------------------------------------------- */
.shell { width: 100%; max-width: var(--shell); margin-inline: auto; padding-inline: var(--pad); }
.section { padding-block: var(--section-y); position: relative; }
.section + .section { border-top: 1px solid var(--hairline); }
/* The header is sticky, so an anchor jump must not park a heading underneath it. */
section[id] { scroll-margin-top: 5.5rem; }

.eyebrow {
  font-family: var(--body);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  color: var(--gold);
}
.lead { color: var(--muted); font-size: 1.125rem; max-width: 46ch; }
.serif { font-family: var(--display); }
.muted { color: var(--muted); }

/* measured gold rule used above and below section titles */
.rule { display: block; width: 4rem; height: 1px; background: var(--gold); opacity: 0.8; }
.rule--center { margin-inline: auto; }

/* rotated diamond accent */
.diamond {
  display: inline-grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--line-strong);
  transform: rotate(45deg);
  transition: transform var(--dur-slow) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.diamond > * { transform: rotate(-45deg); }
.diamond span {
  font-family: var(--display);
  color: var(--gold);
  font-size: 1rem;
  letter-spacing: 0.05em;
}

/* roman numeral chips for ordered lists */
.numeral {
  font-family: var(--display);
  color: var(--gold);
  font-size: 1.5rem;
  letter-spacing: var(--track-mid);
  line-height: 1;
}

/* --- header / nav --------------------------------------------------------- */
.skip {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 20;
  background: var(--gold);
  color: #000;
  padding: 0.75rem 1rem;
  font-weight: 600;
  letter-spacing: var(--track-mid);
  text-transform: uppercase;
  font-size: 0.75rem;
}
.skip:focus { left: 0; }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10, 10, 10, 0.86);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.7rem; }
/* The wordmark carries the figure itself rather than a placeholder diamond.
   It uses vitruvian-mark.svg, not the hero asset: SVG stroke width scales with
   the drawing, so the hero's 1.9-unit hairline lands near 0.19px at this size
   and disappears. The mark is the same trace at a weight chosen by rendering
   candidates at this size, because a heavy one fills the figure in. The glow
   stays low: at full strength the mark out-shouted the wordmark beside it. */
.brand__mark {
  width: 2.3rem;
  height: auto;
  filter: drop-shadow(0 0 3px rgba(212, 175, 55, 0.22));
  transition: filter var(--dur) var(--ease);
}
.brand:hover .brand__mark { filter: drop-shadow(0 0 6px rgba(212, 175, 55, 0.4)); }
.brand__name {
  font-family: var(--display);
  font-size: 1.35rem;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
}
.nav__links { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2.25rem); }
.nav__links a {
  font-size: 0.78rem;
  letter-spacing: var(--track-mid);
  text-transform: uppercase;
  color: var(--fg);
  padding-block: 0.5rem;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav__links a:hover,
.nav__links a:focus-visible { color: var(--gold); border-color: var(--gold); }
.nav__toggle {
  display: none;
  background: none;
  border: 1px solid var(--line-strong);
  width: 2.75rem;
  height: 2.75rem;
  cursor: pointer;
}
.nav__toggle span { display: block; width: 1.1rem; height: 1px; margin: 4px auto; background: var(--gold); }

/* --- buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 3rem;
  padding: 0.75rem 1.6rem;
  border: 2px solid var(--gold);
  background: transparent;
  color: var(--gold);
  font-family: var(--body);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--dur-slow) var(--ease), color var(--dur-slow) var(--ease), box-shadow var(--dur-slow) var(--ease);
}
.btn:hover,
.btn:focus-visible { background: var(--gold); color: #000; box-shadow: var(--glow-strong); }
.btn--solid { background: var(--gold); color: #000; }
.btn--solid:hover,
.btn--solid:focus-visible { background: var(--gold-bright); color: #000; }
.btn--ghost { border-width: 1px; }

/* --- hero ----------------------------------------------------------------- */
.hero { position: relative; text-align: center; padding-block: clamp(4rem, 12vw, 8.5rem); }
/* sunburst: rays fanning from the crown of the page */
.hero::before {
  content: "";
  position: absolute;
  inset: -20% 0 auto;
  height: 120%;
  z-index: -1;
  pointer-events: none;
  background: repeating-conic-gradient(from 0deg at 50% 0%, rgba(212, 175, 55, 0.07) 0deg 1.6deg, transparent 1.6deg 9deg);
  -webkit-mask-image: radial-gradient(60% 80% at 50% 0%, #000 0%, transparent 75%);
  mask-image: radial-gradient(60% 80% at 50% 0%, #000 0%, transparent 75%);
}
/* The Vitruvian figure, drawn as vector so it stays hairline-crisp at hero
   size. Its stroke is #d4af37 inside the file and the glow is layered here, so
   both track the tokens rather than being baked into the asset. */
.vitruvian {
  display: block;
  width: min(10.5rem, 60vw);
  height: auto;
  margin: 0 auto 2.25rem;
  filter: drop-shadow(0 0 5px rgba(212, 175, 55, 0.35)) drop-shadow(0 0 20px rgba(212, 175, 55, 0.22));
  transition: filter var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.vitruvian:hover {
  transform: translateY(-3px);
  filter: drop-shadow(0 0 9px rgba(212, 175, 55, 0.5)) drop-shadow(0 0 30px rgba(212, 175, 55, 0.3));
}
.hero h1 {
  font-size: clamp(2.6rem, 7.5vw, 5rem);
  text-transform: uppercase;
  letter-spacing: var(--track-wide);
  margin-block: 0.5rem 1.5rem;
}
.hero h1 em { font-style: normal; color: var(--gold); }
.hero .lead { margin-inline: auto; max-width: 52ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; margin-top: 2.5rem; }
.badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.75rem 1.5rem; margin-top: 2.5rem; }
.badges span {
  font-size: 0.72rem;
  letter-spacing: var(--track-mid);
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--hairline);
  padding: 0.4rem 0.85rem;
}
.badges span b { color: var(--gold); font-weight: 600; }


/* --- section head --------------------------------------------------------- */
.head { display: grid; gap: 1.1rem; justify-items: start; margin-bottom: 3rem; }
.head--center { justify-items: center; text-align: center; }
.head h2 {
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  text-transform: uppercase;
  letter-spacing: var(--track-mid);
  max-width: 22ch;
}
.head h2 em { font-style: normal; color: var(--gold); }
.head p { color: var(--muted); max-width: 56ch; }

/* --- cards ---------------------------------------------------------------- */
.grid { display: grid; gap: 1.75rem; grid-template-columns: repeat(3, 1fr); }

.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  padding: clamp(1.5rem, 3vw, 2rem);
  transition: transform var(--dur-slow) var(--ease), border-color var(--dur-slow) var(--ease), background var(--dur-slow) var(--ease);
}
/* L-shaped brackets at opposite corners — the "framed exhibit" detail */
.card::before,
.card::after {
  content: "";
  position: absolute;
  width: 1rem;
  height: 1rem;
  border: 2px solid var(--gold);
  opacity: 0.5;
  transition: opacity var(--dur-slow) var(--ease);
}
.card::before { top: 0.5rem; left: 0.5rem; border-right: 0; border-bottom: 0; }
.card::after { bottom: 0.5rem; right: 0.5rem; border-left: 0; border-top: 0; }
.card:hover,
.card:focus-within { transform: translateY(-8px); border-color: var(--line-strong); background: var(--card-hi); }
.card:hover::before,
.card:hover::after,
.card:focus-within::before,
.card:focus-within::after { opacity: 1; }
.card h3 {
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: var(--track-mid);
  color: var(--gold);
  margin-bottom: 0.6rem;
}
.card p { color: var(--muted); font-size: 1rem; }
.card__icon { margin-bottom: 1.4rem; }
.card:hover .diamond { transform: rotate(0deg); border-color: var(--gold); box-shadow: var(--glow); }
.card:hover .diamond > * { transform: rotate(0deg); }

/* --- loop ----------------------------------------------------------------- */
.loop { display: grid; gap: 1.25rem; grid-template-columns: repeat(7, 1fr); counter-reset: phase; }
.phase { position: relative; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.phase .numeral { display: block; margin-bottom: 0.75rem; }
.phase h3 { font-size: 1rem; text-transform: uppercase; letter-spacing: var(--track-mid); margin-bottom: 0.4rem; }
.phase p { color: var(--muted); font-size: 0.85rem; line-height: 1.5; }

/* --- install command ------------------------------------------------------ */
.cmd code {
  font-family: var(--body);
  color: var(--gold);
  letter-spacing: 0.06em;
}

/* --- measured figures ----------------------------------------------------- */
.figures { display: grid; gap: 1.75rem; grid-template-columns: repeat(3, 1fr); }
.figure { border-left: 2px solid var(--gold); padding-left: 1.25rem; }
.figure b {
  display: block;
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--gold);
  line-height: 1;
}
.figure span { display: block; color: var(--muted); font-size: 0.85rem; margin-top: 0.5rem; }
.figure cite { display: block; color: rgba(242, 240, 228, 0.45); font-style: normal; font-size: 0.7rem; margin-top: 0.4rem; letter-spacing: 0.04em; }

.table { width: 100%; border-collapse: collapse; margin-top: 3rem; }
.table caption { text-align: left; color: var(--muted); font-size: 0.8rem; margin-bottom: 0.75rem; }
.table th, .table td { text-align: left; padding: 0.9rem 0.75rem; border-bottom: 1px solid var(--hairline); font-size: 0.9rem; vertical-align: top; }
.table th { color: var(--gold); font-family: var(--body); font-weight: 600; text-transform: uppercase; letter-spacing: var(--track-mid); font-size: 0.7rem; }
.table td:first-child { color: var(--fg); }
.table td { color: var(--muted); }
.table strong { color: var(--fg); font-weight: 600; }

.limits { display: grid; gap: 1.25rem; margin-top: 3rem; }
.limit { display: grid; grid-template-columns: 3.5rem 1fr; gap: 1rem; align-items: baseline; border-top: 1px solid var(--hairline); padding-top: 1rem; }
.limit .numeral { font-size: 1.1rem; }
.limit h3 { font-size: 1rem; color: var(--fg); text-transform: none; letter-spacing: 0.02em; margin-bottom: 0.25rem; }
.limit p { color: var(--muted); font-size: 0.9rem; }

/* --- install -------------------------------------------------------------- */
.install { display: grid; gap: 2rem; grid-template-columns: 1.1fr 1fr; align-items: start; }
.cmd {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border: 1px solid var(--line-strong);
  background: #000;
  padding: 1rem 1.1rem;
  box-shadow: var(--glow);
}
.cmd code { flex: 1; font-size: 0.95rem; overflow-wrap: anywhere; }
.cmd .copy {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--gold);
  padding: 0.4rem 0.7rem;
  font-size: 0.65rem;
  letter-spacing: var(--track-mid);
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.cmd .copy:hover, .cmd .copy:focus-visible { background: var(--gold); color: #000; }
.hosts { display: grid; gap: 0; margin-top: 1.5rem; }
.hosts div { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; padding: 0.7rem 0; border-bottom: 1px solid var(--hairline); font-size: 0.88rem; }
.hosts dt { color: var(--gold); font-weight: 600; letter-spacing: 0.04em; }
.hosts dd { margin: 0; color: var(--muted); }
.hosts code, .install-note code { color: var(--fg); }
.install-note { margin-top: 1.5rem; color: var(--muted); font-size: 0.85rem; border-left: 2px solid var(--blue); padding-left: 0.9rem; }

/* --- skills page ---------------------------------------------------------- */
/* --- catalogue ------------------------------------------------------------ */
/* Three columns: the catalogue is a reference list, not a set of feature
   cards, so density beats roominess here. */
.skill-grid { display: grid; gap: 1rem; grid-template-columns: repeat(3, 1fr); }
.skill {
  display: block;
  text-align: center;
  border: 1px solid var(--line);
  background: var(--card);
  padding: 1.1rem 1rem 1.2rem;
  transition: border-color var(--dur-slow) var(--ease), background var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.skill:hover, .skill:focus-within { border-color: var(--line-strong); background: var(--card-hi); transform: translateY(-5px); }
.skill h4 { color: var(--gold); font-size: 1rem; text-transform: uppercase; letter-spacing: var(--track-mid); margin-bottom: 0.35rem; }
.skill code { display: block; color: var(--gold-bright); font-size: 0.78rem; letter-spacing: 0.05em; margin-bottom: 0.5rem; overflow-wrap: anywhere; }
.skill p { color: var(--muted); font-size: 0.82rem; line-height: 1.55; }

/* Plate number: the Roman numeral centred over a hairline that fits it.
   The dash is on an inline-block so its border tracks the numeral's own width
   instead of a fixed width the numeral overflowed — I and XVII were wider than
   the 1.6rem tick they sat on. */
.mark {
  display: inline-block;
  font-family: var(--display);
  color: var(--gold);
  font-size: 1.05rem;
  line-height: 1;
  letter-spacing: 0.1em;
  padding-bottom: 0.4rem;
  margin-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}
.skill:hover .mark { border-color: var(--line-strong); }

/* A tier is one group of the catalogue. Numerals restart inside each, so each
   group is numbered from I rather than continuing I..XXV across all four. */
.tier { margin-top: 3.5rem; }
.tier .head { margin-bottom: 1.5rem; gap: 0.7rem; }
.tier .head h3 {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  text-transform: uppercase;
  letter-spacing: var(--track-mid);
  color: var(--fg);
}
.tier .head h3 em { font-style: normal; color: var(--gold); }
.tier .head p { font-size: 0.92rem; }

/* Dot micro-grid in the corner, as on an engraved plate. */
.dots {
  position: absolute;
  top: 0;
  right: 0;
  width: min(20rem, 62vw);
  height: 13rem;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(circle, rgba(212, 175, 55, 0.22) 1px, transparent 1px);
  background-size: 15px 15px;
  -webkit-mask-image: linear-gradient(225deg, #000 0%, transparent 55%);
  mask-image: linear-gradient(225deg, #000 0%, transparent 55%);
}
.compass {
  position: absolute;
  z-index: -1;
  pointer-events: none;
  width: min(46rem, 90vw);
  aspect-ratio: 1;
  border: 1px solid rgba(212, 175, 55, 0.12);
  border-radius: 50%;
  background:
    linear-gradient(to right, transparent calc(50% - 0.5px), rgba(212, 175, 55, 0.1) 50%, transparent calc(50% + 0.5px)),
    linear-gradient(to bottom, transparent calc(50% - 0.5px), rgba(212, 175, 55, 0.1) 50%, transparent calc(50% + 0.5px)),
    radial-gradient(circle, transparent calc(50% - 1px), rgba(212, 175, 55, 0.08) 50%, transparent calc(50% + 1px));
}
.compass::before,
.compass::after {
  content: "";
  position: absolute;
  inset: 12%;
  border: 1px solid rgba(212, 175, 55, 0.07);
  border-radius: 50%;
}
.compass::after { inset: 28%; }
/* Placed beside the measured figures, where the geometry reads as instrumentation. */
/* Kept inside the viewport on purpose: bleeding it off the edge widened the
   document to 1123px and produced a horizontal scrollbar. */
#measured .compass { top: 4rem; right: 0; opacity: 0.8; }
@media (max-width: 62rem) { #measured .compass { display: none; } }

/* --- footer --------------------------------------------------------------- */
.footer { border-top: 1px solid var(--line); padding-block: 4rem 3rem; }
.footer__grid { display: grid; gap: 2rem; grid-template-columns: repeat(4, 1fr); }
.footer h2 {
  font-family: var(--body);
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: var(--track-wide);
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1rem;
}
.footer li { margin-bottom: 0.55rem; }
.footer a { color: var(--muted); font-size: 0.9rem; border-bottom: 1px solid transparent; transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.footer a:hover, .footer a:focus-visible { color: var(--gold); border-color: var(--gold); }
.footer__base {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.78rem;
}
.footer__base p { max-width: 62ch; }

/* --- motion --------------------------------------------------------------- */
[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 700ms var(--ease), transform 700ms var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }
[data-reveal][data-delay="1"] { transition-delay: 90ms; }
[data-reveal][data-delay="2"] { transition-delay: 180ms; }

/* --- accessibility -------------------------------------------------------- */
:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
.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;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  [data-reveal] { opacity: 1; transform: none; }
}

/* --- responsive ----------------------------------------------------------- */
@media (max-width: 62rem) {
  .loop { grid-template-columns: repeat(3, 1fr); }
  .figures { grid-template-columns: repeat(2, 1fr); }
  .install { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 46rem) {
  .nav__links {
    position: absolute;
    inset: 100% 0 auto;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem var(--pad) 1.25rem;
    display: none;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { width: 100%; padding-block: 0.85rem; border-bottom: 1px solid var(--hairline); }
  .nav__toggle { display: block; }
  .grid, .skill-grid, .figures { grid-template-columns: 1fr; }
  .loop { grid-template-columns: repeat(2, 1fr); }
  .hosts div { grid-template-columns: 1fr; gap: 0.15rem; }
}