/* =====================================================================
   ORRERY — "The Observatory"
   Design system: tokens, type scale, layout, components, motion.
   ===================================================================== */

/* ---------- 1. Tokens ------------------------------------------------ */
:root {
  /* Base — true neutral ink (no hue) */
  --ink:        oklch(0.120 0 0);
  --ink-2:      oklch(0.165 0 0);
  --indigo:     oklch(0.215 0 0);
  --indigo-hi:  oklch(0.290 0 0);

  /* Silver + white (type & ornament) — was gold */
  --gold:       oklch(0.880 0 0);
  --gold-soft:  oklch(0.985 0 0);
  --gold-deep:  oklch(0.700 0 0);
  --ivory:      oklch(0.975 0 0);
  --ivory-dim:  oklch(0.820 0 0);
  --ivory-faint:oklch(0.620 0 0);

  /* Nebula light — neutral white glows (was aurora) */
  --aur-a: oklch(0.72 0 0);
  --aur-b: oklch(0.52 0 0);
  --aur-c: oklch(0.86 0 0);

  /* Planet tones — polished grayscale spheres (was jewels) */
  --j-sapphire: oklch(0.62 0 0);
  --j-amber:    oklch(0.80 0 0);
  --j-emerald:  oklch(0.70 0 0);
  --j-amethyst: oklch(0.56 0 0);
  --j-rose:     oklch(0.66 0 0);

  /* Hairlines & glass */
  --line:        color-mix(in oklab, var(--gold) 26%, transparent);
  --line-soft:   color-mix(in oklab, var(--gold) 13%, transparent);
  --glass:       color-mix(in oklab, var(--indigo) 55%, transparent);
  --glass-edge:  color-mix(in oklab, var(--gold) 30%, transparent);

  /* Density multiplier (driven by tweak: 0.82 calm → 1.28 lush) */
  --density: 1;

  /* Fluid type scale (Fraunces display + Hanken body) */
  --fs-eyebrow: clamp(0.66rem, 0.6rem + 0.25vw, 0.78rem);
  --fs-body:    clamp(1.02rem, 0.96rem + 0.3vw, 1.18rem);
  --fs-lead:    clamp(1.22rem, 1.05rem + 0.7vw, 1.6rem);
  --fs-h4:      clamp(1.3rem, 1.1rem + 0.9vw, 1.9rem);
  --fs-h3:      clamp(1.7rem, 1.3rem + 1.8vw, 2.9rem);
  --fs-h2:      clamp(2.3rem, 1.6rem + 3.2vw, 4.6rem);
  --fs-h1:      clamp(2.7rem, 1.7rem + 4.2vw, 5.6rem);
  --fs-numeral: clamp(2.4rem, 1.6rem + 4vw, 6rem);

  /* Spacing scale (× density where it reads as breathing room) */
  --s1: 0.5rem;  --s2: 0.75rem; --s3: 1rem;   --s4: 1.5rem;
  --s5: 2rem;    --s6: 3rem;    --s7: 4.5rem;  --s8: 6.5rem;
  --section-y: calc(clamp(5rem, 4rem + 7vw, 11rem) * var(--density));
  --gutter:    clamp(1.25rem, 0.6rem + 3vw, 4rem);
  --maxw: 1280px;
  --maxw-text: 720px;

  /* Motion */
  --ease-cinematic: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft:      cubic-bezier(0.4, 0, 0.1, 1);

  --shadow-deep:
    0 2px 4px oklch(0 0 0 / 0.4),
    0 18px 50px oklch(0 0 0 / 0.55),
    0 40px 120px oklch(0.05 0 0 / 0.6);
}

/* Palette variant — "stark": brighter, higher-contrast whites */
body[data-palette="cool"] {
  --aur-a: oklch(0.80 0 0);
  --aur-b: oklch(0.60 0 0);
  --aur-c: oklch(0.92 0 0);
  --gold:      oklch(0.96 0 0);
  --gold-soft: oklch(1 0 0);
  --gold-deep: oklch(0.78 0 0);
}

/* ---------- 2. Reset ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: "Hanken Grotesk", system-ui, sans-serif;
  font-size: var(--fs-body);
  line-height: 1.62;
  color: var(--ivory-dim);
  background: var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, canvas, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
::selection { background: color-mix(in oklab, var(--gold) 40%, transparent); color: var(--ivory); }

/* ---------- 3. Typography ------------------------------------------- */
.display {
  font-family: "Fraunces", Georgia, serif;
  font-optical-sizing: auto;
  font-weight: 380;
  line-height: 1.02;
  letter-spacing: -0.012em;
  color: var(--ivory);
  text-wrap: balance;
}
.display em { font-style: italic; font-weight: 360; color: var(--gold-soft); }

h1.display { font-size: var(--fs-h1); line-height: 1.07; }
h2.display { font-size: var(--fs-h2); line-height: 1.04; }
h3.display { font-size: var(--fs-h3); line-height: 1.08; }
h4.display { font-size: var(--fs-h4); line-height: 1.12; font-weight: 420; }

.eyebrow {
  font-family: "Hanken Grotesk", sans-serif;
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.34em;
  color: var(--gold);
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
}
.eyebrow::before {
  content: "";
  width: clamp(1.4rem, 3vw, 2.8rem);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
}
.eyebrow.no-rule::before { display: none; }

.lead {
  font-size: var(--fs-lead);
  line-height: 1.5;
  color: var(--ivory);
  font-weight: 350;
  text-wrap: pretty;
}
.body-text { max-width: var(--maxw-text); text-wrap: pretty; }
.body-text + .body-text { margin-top: var(--s4); }

.numeral {
  font-family: "Fraunces", Georgia, serif;
  font-weight: 340;
  font-size: var(--fs-numeral);
  color: var(--gold);
  line-height: 0.9;
  letter-spacing: -0.02em;
  font-variant-numeric: lining-nums;
}

.muted { color: var(--ivory-faint); }
.gold-text { color: var(--gold); }

/* ---------- 4. Layout ----------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap-text { max-width: calc(var(--maxw-text) + var(--gutter) * 2); }

section.band {
  position: relative;
  padding-block: var(--section-y);
  z-index: 2;
}

/* Hairline rules used as ornament between/within sections */
.rule {
  height: 1px; border: 0;
  background: linear-gradient(90deg, transparent, var(--line) 18%, var(--line) 82%, transparent);
}
.rule-short { width: 64px; height: 1px; background: linear-gradient(90deg, var(--gold), transparent); border: 0; }

/* ---------- 5. Background field (stars, aurora, grain) -------------- */
.field {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
#starfield { position: fixed; inset: 0; z-index: 0; pointer-events: none; }

/* Aurora — slow drifting gradient blobs */
.aurora {
  position: fixed; inset: -20vh -10vw;
  z-index: 1; pointer-events: none;
  opacity: 1;
  transition: opacity 1.2s var(--ease-soft);
  filter: blur(60px) saturate(1.1);
  mix-blend-mode: screen;
}
body[data-aurora="off"] .aurora { opacity: 0; }
.aurora span {
  position: absolute;
  border-radius: 50%;
  opacity: 0.32;
  will-change: transform;
}
.aurora .a1 {
  width: 60vw; height: 60vw; left: -10vw; top: 2vh;
  background: radial-gradient(circle, var(--aur-a), transparent 62%);
  animation: drift1 46s ease-in-out infinite;
}
.aurora .a2 {
  width: 55vw; height: 55vw; right: -8vw; top: 38vh;
  background: radial-gradient(circle, var(--aur-b), transparent 62%);
  animation: drift2 58s ease-in-out infinite;
}
.aurora .a3 {
  width: 48vw; height: 48vw; left: 22vw; top: 78vh;
  background: radial-gradient(circle, var(--aur-c), transparent 64%);
  opacity: 0.24;
  animation: drift3 52s ease-in-out infinite;
}
@keyframes drift1 { 0%,100%{transform:translate3d(0,0,0) scale(1);} 50%{transform:translate3d(6vw,4vh,0) scale(1.12);} }
@keyframes drift2 { 0%,100%{transform:translate3d(0,0,0) scale(1.05);} 50%{transform:translate3d(-5vw,-3vh,0) scale(0.92);} }
@keyframes drift3 { 0%,100%{transform:translate3d(0,0,0) scale(0.95);} 50%{transform:translate3d(4vw,-5vh,0) scale(1.1);} }
@media (prefers-reduced-motion: reduce) {
  .aurora span { animation: none !important; }
}

/* Vignette to deepen the edges like a lens */
.vignette {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: radial-gradient(120% 90% at 50% 30%, transparent 40%, oklch(0.06 0 0 / 0.6) 100%);
}

/* Grain overlay */
.grain {
  position: fixed; inset: 0; z-index: 60; pointer-events: none;
  opacity: 0.06;
  mix-blend-mode: overlay;
  transition: opacity 0.6s var(--ease-soft);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
body[data-grain="off"] .grain { opacity: 0; }

/* ---------- 6. Buttons & links -------------------------------------- */
.btn {
  position: relative;
  display: inline-flex; align-items: center; gap: 0.6em;
  padding: 0.95em 1.7em;
  font-weight: 600; font-size: 0.95rem;
  letter-spacing: 0.02em;
  border-radius: 999px;
  transition: transform 0.4s var(--ease-cinematic), box-shadow 0.4s var(--ease-soft), background 0.4s;
  white-space: nowrap;
}
.btn-gold {
  color: oklch(0.14 0 0);
  background: linear-gradient(180deg, var(--gold-soft), var(--gold-deep));
  box-shadow:
    0 0 0 1px color-mix(in oklab, var(--gold) 60%, transparent),
    0 6px 22px color-mix(in oklab, var(--gold) 28%, transparent),
    inset 0 1px 0 oklch(1 0 0 / 0.5);
}
.btn-gold::after {
  content: ""; position: absolute; inset: -40%;
  background: radial-gradient(closest-side, color-mix(in oklab, var(--gold) 55%, transparent), transparent 70%);
  opacity: 0; transition: opacity 0.5s var(--ease-soft);
  z-index: -1; border-radius: inherit;
}
.btn-gold:hover { transform: translateY(-2px); }
.btn-gold:hover::after { opacity: 0.9; }

.btn-ghost {
  color: var(--ivory);
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--indigo) 30%, transparent);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover { border-color: var(--gold); transform: translateY(-2px); color: var(--gold-soft); }

.link-arrow {
  display: inline-flex; align-items: center; gap: 0.5em;
  color: var(--gold); font-weight: 600; font-size: 0.95rem;
  letter-spacing: 0.02em;
}
.link-arrow .arr { transition: transform 0.4s var(--ease-cinematic); }
.link-arrow:hover .arr { transform: translateX(6px); }

/* ---------- 7. Header ----------------------------------------------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s4);
  padding: var(--s5) var(--gutter);
  transition: padding 0.5s var(--ease-soft), background 0.5s, backdrop-filter 0.5s, border-color 0.5s;
  border-bottom: 1px solid transparent;
}
.site-header.condensed {
  padding-block: 0.85rem;
  background: color-mix(in oklab, var(--ink) 72%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom-color: var(--line-soft);
}
/* Editorial header variant — taller, centered nav stack */
body[data-header="editorial"] .site-header { padding-block: calc(var(--s5) + 0.6rem); }
body[data-header="editorial"] .site-header.condensed { padding-block: 1.1rem; }

.wordmark {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: "Fraunces", serif;
  font-weight: 420;
  font-size: clamp(1.3rem, 1.1rem + 0.6vw, 1.6rem);
  letter-spacing: 0.26em;
  color: var(--ivory);
  text-transform: uppercase;
  padding-left: 0.26em;
}
.wordmark .star {
  width: 0.5em; height: 0.5em; border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, var(--gold-soft), var(--gold-deep));
  box-shadow: 0 0 10px var(--gold), 0 0 22px color-mix(in oklab, var(--gold) 60%, transparent);
  animation: twinkle 3.6s var(--ease-soft) infinite;
  align-self: center;
}
@keyframes twinkle {
  0%, 100% { transform: scale(1); opacity: 1; box-shadow: 0 0 10px var(--gold), 0 0 22px color-mix(in oklab, var(--gold) 60%, transparent); }
  50%      { transform: scale(1.35); opacity: 0.85; box-shadow: 0 0 16px var(--gold-soft), 0 0 34px var(--gold); }
}

/* Infinity logo mark — an SVG lemniscate (figure-eight orbit) with a star at the crossing */
.wordmark .mark { display:inline-flex; align-items:center; width:1.9em; height:1.05em; color:var(--gold); flex:0 0 auto; }
.wordmark .mark svg { width:100%; height:100%; overflow:visible; filter: drop-shadow(0 0 5px color-mix(in oklab, var(--gold) 55%, transparent)); }
.wordmark .mark .mark-path { stroke: currentColor; }
.wordmark .mark .mark-star { fill: var(--gold-soft); transform-box: fill-box; transform-origin: center; animation: twinkle 3.6s var(--ease-soft) infinite; }
.wordmark .wordname { font: inherit; letter-spacing: inherit; }
@media (prefers-reduced-motion: reduce){ .wordmark .mark .mark-star { animation: none; } }

/* live system canvas — the real generative art, replaces CSS mini-systems */
.sysview { width: 100%; height: 100%; display: block; }

.nav {
  display: flex; align-items: center; gap: clamp(1.1rem, 2.2vw, 2.4rem);
  position: relative;
}
.nav a {
  font-size: 0.86rem; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ivory-dim);
  padding: 0.4rem 0.1rem;
  transition: color 0.35s var(--ease-soft);
  position: relative;
}
.nav a:hover, .nav a.active { color: var(--ivory); }
/* sliding gold underline */
.nav .underline {
  position: absolute; bottom: -2px; height: 1.5px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  box-shadow: 0 0 8px var(--gold);
  transition: left 0.5s var(--ease-cinematic), width 0.5s var(--ease-cinematic), opacity 0.4s;
  opacity: 0; left: 0; width: 0;
  pointer-events: none;
}

.header-right { display: flex; align-items: center; gap: var(--s4); }

.menu-toggle { display: none; width: 30px; height: 18px; position: relative; }
.menu-toggle span {
  position: absolute; left: 0; right: 0; height: 1.5px; background: var(--ivory);
  transition: transform 0.4s var(--ease-cinematic), opacity 0.3s;
}
.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 8px; }
.menu-toggle span:nth-child(3) { top: 16px; }

/* Mobile full-screen overlay menu */
.mobile-menu {
  position: fixed; inset: 0; z-index: 49;
  background: color-mix(in oklab, var(--ink) 92%, transparent);
  backdrop-filter: blur(24px) saturate(1.2);
  display: flex; flex-direction: column; justify-content: center;
  padding: var(--gutter);
  gap: var(--s4);
  opacity: 0; visibility: hidden;
  transition: opacity 0.6s var(--ease-soft), visibility 0.6s;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu a {
  font-family: "Fraunces", serif; font-size: clamp(2rem, 9vw, 3.4rem);
  font-weight: 360; color: var(--ivory);
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--line-soft);
  padding: 0.5rem 0;
  display: flex; justify-content: space-between; align-items: baseline;
  transform: translateY(18px); opacity: 0;
  transition: transform 0.6s var(--ease-cinematic), opacity 0.6s, color 0.3s;
}
.mobile-menu.open a { transform: translateY(0); opacity: 1; }
.mobile-menu a:hover { color: var(--gold); }
.mobile-menu a .idx { font-family: "Hanken Grotesk"; font-size: 0.8rem; color: var(--gold); letter-spacing: 0.2em; }
.mobile-menu .mm-foot { margin-top: var(--s5); }

@media (max-width: 860px) {
  .nav, .header-right .btn-desktop { display: none; }
  .menu-toggle { display: block; }
}

/* ---------- 8. Reveal choreography ---------------------------------- */
.reveal {
  opacity: 0; transform: translateY(34px);
  transition: opacity 1s var(--ease-cinematic), transform 1.1s var(--ease-cinematic);
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* ---------- 9. Misc shared components ------------------------------- */
.glass-card {
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--indigo) 50%, transparent),
    color-mix(in oklab, var(--ink-2) 60%, transparent));
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 oklch(1 0 0 / 0.04) inset, 0 30px 60px oklch(0 0 0 / 0.35);
}

.footnote { font-size: 0.84rem; color: var(--ivory-faint); letter-spacing: 0.01em; }
.skip-target { scroll-margin-top: 120px; }