/* ==========================================================================
   INVSYS — stylesheet
   Palette and type are defined once here as custom properties.
   Change the tokens below to re-skin the whole site.
   ========================================================================== */

:root {
  /* Colour: pulled from the logo (amber) and the board photograph (greens) */
  --board-900: #060d0a;
  --board-800: #0b1a13;
  --board-700: #12281d;
  --board-600: #1c3b2b;
  --trace:     #3fa06a;
  --amber:     #ffbe4a;
  --amber-dim: #a9762a;
  --bone:      #e9f1ea;
  --mute:      #8aa396;

  /* Type */
  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Layout */
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --measure: 68rem;
  --rail: 3.5rem;        /* width of the bus-rail gutter on the feed */
  --hairline: 1px;
}

/* --------------------------------------------------------------- reset -- */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--board-900);
  color: var(--bone);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.65;
  font-feature-settings: "ss01";
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; }

/* keep anchored sections clear of the sticky header */
[id] { scroll-margin-top: 5.5rem; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--amber);
  color: var(--board-900);
  padding: 0.6rem 1rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* ------------------------------------------------------- shared pieces -- */

.wrap {
  width: 100%;
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Silkscreen label — small mono type, used for eyebrows, dates, designators */
.silk {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
}

.silk--amber { color: var(--amber); }

h1, h2, h3 {
  font-family: var(--display);
  font-weight: 700;
  font-stretch: 112%;
  letter-spacing: -0.015em;
  line-height: 1.04;
  text-transform: uppercase;
  margin: 0;
}

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------- header -- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: var(--hairline) solid transparent;
  transition: background-color 200ms ease, border-color 200ms ease;
}

.masthead.is-stuck {
  background: rgba(6, 13, 10, 0.88);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--board-700);
}

.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}

.brand__mark { width: 30px; height: 30px; flex: none; }

.brand__name {
  font-family: var(--display);
  font-weight: 700;
  font-stretch: 112%;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: 1.05rem;
}

.brand__name em {
  font-style: normal;
  color: var(--amber);
}

.masthead__right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav { display: flex; align-items: center; gap: 1.75rem; }

.nav a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--mute);
  padding-block: 0.35rem;
  border-bottom: var(--hairline) solid transparent;
  transition: color 150ms ease, border-color 150ms ease;
}

.nav a:hover { color: var(--bone); }
.nav a[aria-current="page"] { color: var(--bone); border-bottom-color: var(--amber); }

/* --------------------------------------------------- language switch -- */

.langs {
  display: flex;
  align-items: stretch;
  border: var(--hairline) solid var(--board-600);
}

.lang {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
  background: transparent;
  border: 0;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  transition: color 150ms ease, background-color 150ms ease;
}

.lang + .lang { border-left: var(--hairline) solid var(--board-600); }
.lang:hover { color: var(--bone); }
.lang[aria-pressed="true"] { color: var(--board-900); background: var(--amber); }

/* --------------------------------------------------------------- hero -- */

.hero {
  position: relative;
  min-height: min(78vh, 44rem);
  margin-top: -4.5rem;      /* slide under the sticky header */
  padding-top: 4.5rem;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  isolation: isolate;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  background-color: var(--board-800);
  /* The photograph is the top layer. The gradients underneath are what shows
     if background.jpg is missing, so the hero still looks deliberate. */
  background-image:
    url("../img/background.jpg"),
    radial-gradient(60% 80% at 20% 30%, rgba(63, 160, 106, 0.30), transparent 62%),
    radial-gradient(50% 70% at 82% 18%, rgba(255, 190, 74, 0.10), transparent 60%),
    linear-gradient(160deg, var(--board-700), var(--board-900));
  background-size: cover, auto, auto, auto;
  background-position: center 40%, center, center, center;
  background-repeat: no-repeat;
}

.hero__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(to top, var(--board-900) 2%, rgba(6, 13, 10, 0.55) 45%, rgba(6, 13, 10, 0.75) 100%),
    radial-gradient(120% 90% at 15% 90%, rgba(6, 13, 10, 0.9), transparent 60%);
}

.hero__inner { padding-block: clamp(3rem, 9vw, 6.5rem); width: 100%; }

.hero__eyebrow { display: block; margin-bottom: 1.25rem; }

.hero h1 {
  font-size: clamp(2.6rem, 8.5vw, 5.75rem);
  max-width: 15ch;
  margin-bottom: 1.5rem;
}

.hero h1 .hl { color: var(--amber); }

.hero__lede {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--bone);
  max-width: 46ch;
  margin-bottom: 2rem;
}

.hero__actions { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ------------------------------------------------------------ buttons -- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.85rem 1.4rem;
  border: var(--hairline) solid var(--amber);
  color: var(--amber);
  background: transparent;
  transition: background-color 150ms ease, color 150ms ease;
}

.btn:hover { background: var(--amber); color: var(--board-900); }

.btn--ghost { border-color: var(--board-600); color: var(--mute); }
.btn--ghost:hover { background: var(--board-700); color: var(--bone); }

/* ----------------------------------------------------------- sections -- */

.band { padding-block: clamp(3.5rem, 8vw, 6rem); }
.band--rule { border-top: var(--hairline) solid var(--board-700); }

.band__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  margin-bottom: 2.75rem;
}

.band__head h2 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); }

/* -------------------------------------------------- capability strip -- */

.specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--hairline);
  background: var(--board-700);
  border: var(--hairline) solid var(--board-700);
}

.specs > div {
  background: var(--board-900);
  padding: 1.75rem 1.5rem;
}

.specs h3 {
  font-size: 1rem;
  letter-spacing: 0.01em;
  margin-block: 0.75rem 0.5rem;
}

.specs p { color: var(--mute); font-size: 0.92rem; }

/* --------------------------------------------------- the bus rail feed --
   Signature element: a hairline trace running down the left gutter with a
   square solder pad at every entry, the way a bus line is drawn on a board.
   -------------------------------------------------------------------- */

.feed {
  position: relative;
  padding-left: var(--rail);
  list-style: none;
  margin: 0;
}

.feed::before {
  content: "";
  position: absolute;
  left: calc(var(--rail) / 2);
  top: 0.75rem;
  bottom: 0.75rem;
  width: var(--hairline);
  background: linear-gradient(
    to bottom,
    transparent,
    var(--board-600) 8%,
    var(--board-600) 92%,
    transparent
  );
}

.entry { position: relative; padding-block: 1.75rem; }
.entry + .entry { border-top: var(--hairline) solid var(--board-700); }

/* solder pad */
.entry::before {
  content: "";
  position: absolute;
  left: calc(var(--rail) / -2 - 4px);
  top: 2.3rem;
  width: 9px;
  height: 9px;
  background: var(--board-900);
  border: var(--hairline) solid var(--trace);
  transition: background-color 200ms ease, border-color 200ms ease;
}

/* stub connecting the pad to the entry */
.entry::after {
  content: "";
  position: absolute;
  left: calc(var(--rail) / -2 + 5px);
  top: calc(2.3rem + 4px);
  width: calc(var(--rail) / 2 - 5px);
  height: var(--hairline);
  background: var(--board-600);
  transition: background-color 200ms ease;
}

.entry:hover::before { background: var(--amber); border-color: var(--amber); }
.entry:hover::after { background: var(--amber-dim); }

.entry__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin-bottom: 0.6rem;
}

.entry h3 {
  font-size: clamp(1.15rem, 2.2vw, 1.5rem);
  margin-bottom: 0.6rem;
}

.entry p { color: var(--mute); max-width: 62ch; }

.entry__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0;
  list-style: none;
}

.tag {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--trace);
  border: var(--hairline) solid var(--board-600);
  padding: 0.25rem 0.55rem;
}

/* ----------------------------------------------------- projects page -- */

.page-head {
  padding-block: clamp(3.5rem, 9vw, 6rem) clamp(2rem, 4vw, 3rem);
  border-bottom: var(--hairline) solid var(--board-700);
  background:
    linear-gradient(to bottom, rgba(6, 13, 10, 0.86), var(--board-900)),
    url("../img/background.jpg") center/cover,
    linear-gradient(160deg, var(--board-700), var(--board-900));
}

.page-head h1 {
  font-size: clamp(2.2rem, 6vw, 3.75rem);
  margin-block: 1rem 1.25rem;
}

.page-head p { color: var(--mute); max-width: 52ch; }

.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.filters__label { margin-right: 0.5rem; }

.filter {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
  background: transparent;
  border: var(--hairline) solid var(--board-600);
  padding: 0.4rem 0.8rem;
  cursor: pointer;
  transition: color 150ms ease, border-color 150ms ease;
}

.filter:hover { color: var(--bone); }
.filter[aria-pressed="true"] { color: var(--board-900); background: var(--amber); border-color: var(--amber); }

.project {
  display: grid;
  grid-template-columns: 7rem 1fr auto;
  gap: 0.5rem 2rem;
  align-items: start;
  padding-block: 2rem;
  border-top: var(--hairline) solid var(--board-700);
}

.project:last-child { border-bottom: var(--hairline) solid var(--board-700); }

.project__id { padding-top: 0.35rem; }

.project h3 { font-size: clamp(1.2rem, 2.4vw, 1.6rem); margin-bottom: 0.6rem; }
.project p { color: var(--mute); max-width: 58ch; }

.project__aside {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  padding-top: 0.35rem;
  text-align: right;
}

.status {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.25rem 0.55rem;
  border: var(--hairline) solid currentColor;
  white-space: nowrap;
}

.status--live      { color: var(--amber); }
.status--building  { color: var(--trace); }
.status--archived  { color: var(--mute); }

.project__link {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  text-decoration: none;
  border-bottom: var(--hairline) solid transparent;
}

.project__link:hover { border-bottom-color: var(--amber); }

/* --------------------------------------------------------- error pages -- */

.errpage {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  display: flex;
  align-items: center;
  min-height: 68vh;
  padding-block: clamp(3rem, 8vw, 5rem);
  background:
    linear-gradient(to bottom, rgba(6, 13, 10, 0.9), var(--board-900)),
    linear-gradient(160deg, var(--board-700), var(--board-900));
}

/* The status code, set huge and dim behind the text — a board marking rather
   than a decoration. Hidden from assistive tech; the real code is in the
   silkscreen label above the heading. */
.errpage__ghost {
  position: absolute;
  z-index: -1;
  right: -0.06em;
  bottom: -0.28em;
  font-family: var(--display);
  font-weight: 800;
  font-stretch: 125%;
  font-size: clamp(11rem, 34vw, 26rem);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1px var(--board-600);
  user-select: none;
  pointer-events: none;
}

.errpage__inner { width: 100%; }

.errpage__title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  margin-block: 1rem 1.25rem;
  max-width: 18ch;
}

.errpage__body {
  color: var(--mute);
  max-width: 52ch;
  margin-bottom: 2rem;
}

/* ------------------------------------------------------------- states -- */

.state {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--mute);
  padding-block: 2rem;
}

.state--error { color: var(--amber); }

/* ------------------------------------------------------------- footer -- */

.foot {
  border-top: var(--hairline) solid var(--board-700);
  padding-block: 2.5rem 3.5rem;
  margin-top: 2rem;
}

.foot__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.foot a { color: var(--mute); text-decoration: none; }
.foot a:hover { color: var(--bone); }

/* -------------------------------------------------------- reveal on scroll */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.reveal.is-visible { opacity: 1; transform: none; }

/* ---------------------------------------------------------- responsive -- */

@media (max-width: 46rem) {
  :root { --rail: 2.25rem; }

  .masthead__right { gap: 0.85rem; }
  .nav { gap: 1rem; }
  .nav a { font-size: 0.66rem; letter-spacing: 0.1em; }
  .lang { padding: 0.35rem 0.45rem; font-size: 0.62rem; }

  .project {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .project__aside {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    text-align: left;
    padding-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}