/* ========================================================================
   ASTRA — design tokens & shared styles
   Cosmic atelier: ink black, starlight blue, soft gold, elegant serif display
   ====================================================================== */

:root {
  /* surfaces — Void */
  --ink:        #00000A;
  --ink-2:      #05080F;
  --ink-3:      #0A1220;
  --line:       rgba(32, 96, 255, 0.09);
  --line-2:     rgba(32, 96, 255, 0.17);

  /* type — Supernova */
  --fg:         #F5FFFF;
  --fg-dim:     rgba(245, 255, 255, 0.62);
  --fg-mute:    rgba(245, 255, 255, 0.36);

  /* accents — Electric / Stellar / Nebula */
  --star:       #2060FF;                  /* electric blue */
  --star-dim:   #1040CC;
  --gold:       oklch(0.70 0.18 248);     /* stellar blue */
  --gold-dim:   oklch(0.55 0.16 252);
  --aurora:     oklch(0.62 0.10 255);     /* nebula blue */

  /* fonts */
  --font-display: "Instrument Serif", "Times New Roman", serif;
  --font-body:    "Geist", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* layout */
  --max:        1280px;
  --gutter:     clamp(20px, 4vw, 56px);
  --radius:     14px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { background: var(--ink); color: var(--fg); }

/* ---------- smooth cross-document navigation (Chrome 126+) ---------- */
@view-transition { navigation: auto; }

/* keep persistent chrome continuous across pages */
.nav,
.footer,
.starfield,
.nebula {
  view-transition-name: var(--vt-name, none);
}
.nav    { view-transition-name: site-nav; }
.footer { view-transition-name: site-footer; }
.starfield { view-transition-name: site-stars; }
.nebula { view-transition-name: site-nebula; }

/* default content transitions */
::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 280ms;
  animation-timing-function: cubic-bezier(.16,1,.3,1);
}
::view-transition-old(site-nav),
::view-transition-new(site-nav),
::view-transition-old(site-footer),
::view-transition-new(site-footer),
::view-transition-old(site-stars),
::view-transition-new(site-stars),
::view-transition-old(site-nebula),
::view-transition-new(site-nebula) {
  animation: none;          /* no flicker on persistent chrome */
}
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  background: var(--ink);
  color: var(--fg);
  font-feature-settings: "ss01", "ss02", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }

/* ---------- starfield canvas (fixed behind everything) ---------- */
.starfield {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* nebula wash behind hero */
.nebula {
  position: fixed;
  inset: -10vh -10vw;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(60vw 50vh at 20% 18%, oklch(0.48 0.24 240 / 0.18), transparent 60%),
    radial-gradient(50vw 40vh at 85% 30%, oklch(0.55 0.22 240 / 0.14), transparent 65%),
    radial-gradient(70vw 60vh at 60% 90%, oklch(0.42 0.20 240 / 0.10), transparent 70%);
  filter: blur(40px);
}

/* ---------- nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: linear-gradient(to bottom, rgba(5,6,10,0.72), rgba(5,6,10,0.40));
  border-bottom: 1px solid var(--line);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: 0.02em;
}
.nav-brand .glyph {
  width: 22px; height: 22px;
  position: relative;
  display: inline-block;
}
.nav-brand .glyph::before,
.nav-brand .glyph::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  box-shadow: 0 0 12px var(--star);
}
.nav-brand .glyph::before {
  background: radial-gradient(circle, var(--fg) 0%, var(--star) 55%, transparent 70%);
}
.nav-brand .glyph::after {
  border: 1px solid var(--line-2);
  transform: scale(1.5) rotate(20deg);
  border-radius: 50%;
  box-shadow: none;
  border-top-color: transparent;
  border-bottom-color: transparent;
}

.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
  font-size: 14px;
  color: var(--fg-dim);
}
.nav-links a {
  position: relative;
  transition: color 0.2s;
}
.nav-links a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: -6px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.45s cubic-bezier(.16,1,.3,1);
}
.nav-links a:not(.btn):hover { color: var(--fg); }
.nav-links a:not(.btn):hover::after,
.nav-links a:not(.btn).active::after {
  transform: scaleX(1);
  transform-origin: left center;
}
.nav-links a.active { color: var(--fg); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  border: 1px solid var(--line-2);
  background: rgba(246,246,248,0.04);
  color: var(--fg);
  transition: all 0.25s ease;
}
.btn:hover {
  background: var(--fg);
  color: var(--ink);
  border-color: var(--fg);
}
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--fg-dim);
}
.btn-ghost:hover { color: var(--fg); background: rgba(246,246,248,0.04); border-color: var(--line-2); }

.btn-primary {
  background: var(--fg);
  color: var(--ink);
  border-color: var(--fg);
}
.btn-primary:hover {
  background: var(--star);
  border-color: var(--star);
  box-shadow: 0 0 0 1px var(--star), 0 8px 30px oklch(0.84 0.08 235 / 0.35);
}

.btn .arrow { transition: transform 0.25s; }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------- type ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--star);
  box-shadow: 0 0 10px var(--star);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.04;
  margin: 0;
  text-wrap: balance;
}
h1 { font-size: clamp(56px, 9vw, 132px); }
h2 { font-size: clamp(42px, 6vw, 86px); }
h3 { font-size: clamp(28px, 3.2vw, 44px); }
h4 { font-size: clamp(20px, 1.6vw, 24px); }

.display-italic { font-style: italic; color: var(--fg-dim); }

.lede {
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.5;
  color: var(--fg-dim);
  max-width: 56ch;
}

/* ---------- layout ---------- */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
  z-index: 2;
}
section { position: relative; z-index: 2; }

.divider {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--line-2), transparent);
  margin: 0 var(--gutter);
}

/* ---------- footer ---------- */
.footer {
  position: relative;
  z-index: 2;
  padding: 100px var(--gutter) 56px;
  border-top: 1px solid var(--line);
  margin-top: 80px;
}
.footer-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 60px;
}
.footer h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin: 0 0 18px;
  font-weight: 500;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer ul a {
  color: var(--fg-dim);
  font-size: 14px;
  transition: color 0.2s;
}
.footer ul a:hover { color: var(--fg); }
.footer-tag {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--fg);
  margin-bottom: 16px;
  line-height: 1.2;
}
.footer-bottom {
  max-width: var(--max);
  margin: 56px auto 0;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- generic reveal-on-scroll (with stagger) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s cubic-bezier(.16,1,.3,1),
              transform 0.9s cubic-bezier(.16,1,.3,1);
  transition-delay: calc(var(--d, 0) * 90ms);
}
.reveal.animating {
  will-change: opacity, transform;
}
.reveal.in {
  opacity: 1;
  transform: none;
}

/* a section-divider line that draws in horizontally */
.line-reveal {
  position: relative;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--line-2), transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 1.2s cubic-bezier(.16,1,.3,1);
  margin: 0 var(--gutter);
}
.line-reveal.in { transform: scaleX(1); }

/* drawn-in eyebrow underline */
.eyebrow.reveal-eb { position: relative; }
.eyebrow.reveal-eb::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -8px;
  height: 1px;
  background: var(--line-2);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.9s cubic-bezier(.16,1,.3,1) 0.2s;
}
.eyebrow.reveal-eb.in::after { transform: scaleX(1); }

/* big display heading: subtle ink-wipe reveal */
.headline-wipe {
  display: inline-block;
  clip-path: inset(0 100% 0 0);
  transition: clip-path 1.4s cubic-bezier(.7,0,.2,1) 0.05s;
}
.headline-wipe.in { clip-path: inset(0 0 0 0); }

/* ---------- mobile ---------- */
@media (max-width: 800px) {
  .nav-links { gap: 18px; }
  .nav-links .hide-sm { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .footer-bottom { flex-direction: column; gap: 10px; }
}