/* DUST — public landing page stylesheet.
   System fonts only. No external requests. Works from any base path and via file://.
   Palette: dark earth tones; every text colour clears WCAG AA on both backgrounds. */

:root {
  --bg: #130f0a;
  --bg-2: #1a150e;
  --ink: #e7ddc9;
  --ink-soft: #bdb096;
  --ink-mute: #9a8d73;
  --accent: #cf9a5c;
  --line: rgba(231, 221, 201, 0.14);
  --line-strong: rgba(231, 221, 201, 0.30);
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --measure: 38rem;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.wrap {
  max-width: 72rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-art {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  inset: 0;
  color: var(--accent);
  pointer-events: none;
}
.hero-art svg {
  display: block;
  width: 100%;
  height: 100%;
}
.contours {
  fill: none;
  stroke: currentColor;
  stroke-opacity: 0.17;
  stroke-width: 1.2;
  vector-effect: non-scaling-stroke;
}
.contours path { vector-effect: non-scaling-stroke; }
.dust-static { fill: var(--ink); }
.has-canvas .dust-static { display: none; }
.hero-canvas {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* Vignette: fades the motif toward the edges; sits above the art, below the text. */
.hero::after {
  content: "";
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  inset: 0;
  background: radial-gradient(ellipse at 50% 45%, transparent 30%, var(--bg) 95%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  text-align: center;
  padding-block: clamp(5rem, 14vh, 9rem);
}

.brand {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 4.5rem; /* fallback for browsers without clamp() */
  font-size: clamp(3.75rem, 15vw, 10rem);
  line-height: 1;
  letter-spacing: 0.32em;
  text-indent: 0.32em; /* re-centres a letter-spaced word */
  color: var(--ink);
}

.tagline {
  margin: 1.25rem 0 0;
  font-size: clamp(0.85rem, 1.8vw, 1.05rem);
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.stanza {
  margin: clamp(2.75rem, 7vh, 4.5rem) auto 0;
  max-width: 30ch;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-size: clamp(1.3rem, 2.8vw, 2rem);
  line-height: 1.4;
  color: var(--ink);
}
.stanza span { display: block; }

.coda {
  margin: clamp(2rem, 5vh, 3rem) 0 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--ink-mute);
}

.hero-note {
  position: absolute;
  bottom: 1.25rem;
  left: 0;
  right: 0;
  z-index: 1;
  margin: 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ---------- Sections ---------- */

.section {
  padding-block: 6rem;
  padding-block: clamp(4.5rem, 11vw, 8.5rem);
  border-bottom: 1px solid var(--line);
}
.section-alt { background: var(--bg-2); }

.eyebrow {
  margin: 0 0 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.5rem;
  height: 1px;
  margin-right: 0.75rem;
  vertical-align: middle;
  background: var(--accent);
}

.lede {
  margin: 0;
  max-width: 44rem;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  line-height: 1.4;
  color: var(--ink);
}

.prose {
  max-width: var(--measure);
  margin: 1.5rem 0 0;
  font-size: 1.05rem;
  color: var(--ink-soft);
}
.prose strong { color: var(--ink); font-weight: 500; }

/* Concepts: a definition list, not a feature grid. */
.concepts {
  margin: 3.5rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}
.concepts > div {
  display: grid;
  grid-template-columns: minmax(0, 13rem) minmax(0, 1fr);
  gap: 0.4rem 2.5rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}
.concepts dt {
  margin: 0;
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
}
.concepts dd {
  margin: 0;
  max-width: var(--measure);
  color: var(--ink-soft);
}

/* Pillars */
.pillars {
  list-style: none;
  margin: 3.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 3rem;
}
.pillar {
  border-top: 1px solid var(--line-strong);
  padding-top: 1.5rem;
}
.pillar-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--ink-mute);
}
.pillar h3 {
  margin: 0.75rem 0 1rem;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  letter-spacing: 0.22em;
  line-height: 1.1;
}
.pillar p {
  margin: 0;
  color: var(--ink-soft);
}
.pillar-states {
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  line-height: 1.9;
  color: var(--ink-mute);
}
.pillars-note {
  margin: 3rem 0 0;
  max-width: var(--measure);
  color: var(--ink-mute);
  font-size: 0.95rem;
}

/* The loop: a wrapping chain of stages */
.loop {
  list-style: none;
  margin: 3.5rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem 0;
  font-family: var(--font-mono);
  font-size: clamp(0.72rem, 1.3vw, 0.84rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.loop li {
  display: flex;
  align-items: center;
}
.loop li span {
  padding: 0.6rem 0.95rem;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--ink);
  white-space: nowrap;
}
.loop li.is-key span { border-color: var(--accent); }
.loop li::after {
  content: "\2192"; /* → */
  padding: 0 0.7rem;
  color: var(--accent);
}
.loop li:last-child::after {
  content: "\21BA"; /* ↺ back to NEED */
}

.rule {
  margin: 3.5rem 0 0;
  max-width: var(--measure);
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  line-height: 1.35;
  color: var(--ink);
}
.rule + .prose { margin-top: 1rem; }

/* Status */
.status-list {
  list-style: none;
  margin: 2.5rem 0 0;
  padding: 0;
  max-width: 44rem;
  border-top: 1px solid var(--line-strong);
}
.status-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}
.status-list strong {
  color: var(--ink);
  font-weight: 500;
}

/* Footer */
.footer {
  padding-block: 2.5rem;
  font-size: 0.85rem;
  color: var(--ink-mute);
}
.footer p { margin: 0.25rem 0; }

/* ---------- Progressive enhancement (only when assets/site.js ran) ---------- */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Responsive ---------- */

@media (min-width: 900px) {
  .pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(2rem, 4vw, 4rem);
  }
}

@media (max-width: 640px) {
  .concepts > div {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
  .loop {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  .loop li {
    flex-direction: column;
    align-items: flex-start;
  }
  .loop li span { white-space: normal; }
  .loop li::after {
    content: "\2193"; /* ↓ */
    padding: 0.2rem 0 0.2rem 1rem;
  }
  .loop li:last-child::after {
    content: "\21BA";
  }
}

@media (max-width: 380px) {
  .brand { letter-spacing: 0.22em; text-indent: 0.22em; }
}