/* ============================================================
   ORVANTIS INTELLIGENCE — main.css
   Palette: obsidian #07090D · graphite #11151C · moon silver #AEBECD
            porcelain #E8ECF1 · aurum #B89B5E
   Type:    Newsreader (display) · Geist (interface) · Geist Mono (labels)
   ============================================================ */

/* ---------- fonts ---------- */
@font-face {
  font-family: "Newsreader";
  src: url("../fonts/newsreader-var.woff2") format("woff2");
  font-weight: 300 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Newsreader";
  src: url("../fonts/newsreader-italic-var.woff2") format("woff2");
  font-weight: 300 600;
  font-style: italic;
  font-display: swap;
}
@font-face {
  font-family: "Geist";
  src: url("../fonts/geist-var.woff2") format("woff2");
  font-weight: 300 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("../fonts/geist-mono-var.woff2") format("woff2");
  font-weight: 300 500;
  font-style: normal;
  font-display: swap;
}

/* ---------- tokens ---------- */
:root {
  --obsidian: #07090D;
  --graphite: #11151C;
  --graphite-2: #161B24;
  --silver: #AEBECD;
  --silver-dim: rgba(174, 190, 205, 0.72);
  --silver-faint: rgba(174, 190, 205, 0.5);
  --porcelain: #E8ECF1;
  --aurum: #B89B5E;
  --aurum-dim: rgba(184, 155, 94, 0.55);
  --line: rgba(174, 190, 205, 0.14);
  --line-strong: rgba(174, 190, 205, 0.26);

  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans: "Geist", "Helvetica Neue", Arial, sans-serif;
  --mono: "Geist Mono", "SFMono-Regular", Consolas, monospace;

  --fs-hero: clamp(4.25rem, 15vw, 13rem);
  --fs-h2: clamp(2.35rem, 4.6vw + 0.6rem, 4.9rem);
  --fs-h3: clamp(1.45rem, 1.1rem + 1.4vw, 2.15rem);
  --fs-body: 1.0625rem;
  --fs-label: 0.6875rem;

  --ease-out: cubic-bezier(0.19, 1, 0.22, 1);
  --ease-io: cubic-bezier(0.65, 0, 0.15, 1);
  --dur-slow: 1.25s;
  --dur-med: 0.9s;

  --pad-x: clamp(1.25rem, 5vw, 5.5rem);
  --measure: 34em;
}

/* ---------- reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  background: var(--obsidian);
  color: var(--silver);
  font-family: var(--sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--aurum); color: var(--obsidian); }

a { color: var(--porcelain); text-decoration: none; }
a:hover { color: var(--aurum); }

:focus-visible {
  outline: 1px solid var(--aurum);
  outline-offset: 4px;
  border-radius: 1px;
}

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

/* scrollbar */
@media (pointer: fine) {
  ::-webkit-scrollbar { width: 10px; }
  ::-webkit-scrollbar-track { background: var(--obsidian); }
  ::-webkit-scrollbar-thumb {
    background: #232B36;
    border: 3px solid var(--obsidian);
    border-radius: 6px;
  }
  ::-webkit-scrollbar-thumb:hover { background: var(--aurum-dim); }
}

/* skip link */
.skip-link {
  position: fixed;
  top: 1rem; left: 1rem;
  z-index: 300;
  padding: 0.6rem 1.1rem;
  background: var(--porcelain);
  color: var(--obsidian);
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transform: translateY(-300%);
}
.skip-link:focus-visible { transform: none; color: var(--obsidian); }

/* ---------- the field (canvas) & atmosphere ---------- */
.field-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.vignette {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 50% 42%, transparent 42%, rgba(4, 5, 8, 0.55) 100%),
    linear-gradient(to bottom, rgba(4, 5, 8, 0.35), transparent 18%, transparent 84%, rgba(4, 5, 8, 0.5));
}

.grain {
  position: fixed;
  inset: -60px;
  z-index: 90;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 240px 240px;
}
@media (prefers-reduced-motion: no-preference) {
  .grain { animation: grain-shift 0.9s steps(3) infinite; }
}
@keyframes grain-shift {
  0% { transform: translate(0, 0); }
  33% { transform: translate(-22px, 14px); }
  66% { transform: translate(16px, -20px); }
  100% { transform: translate(0, 0); }
}

/* ---------- preloader: the aperture ---------- */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  background: var(--obsidian);
  animation: pl-gone 0.9s var(--ease-io) 1.35s forwards;
}
.preloader svg { width: clamp(84px, 12vw, 132px); height: auto; overflow: visible; }
.preloader .pl-arc {
  fill: none;
  stroke: var(--silver);
  stroke-width: 0.75;
  stroke-linecap: round;
  transform-origin: 32px 32px;
  opacity: 0;
  animation:
    pl-arc-in 1.1s var(--ease-out) forwards,
    pl-arc-open 0.85s var(--ease-io) 1.25s forwards;
}
.preloader .pl-arc:nth-child(2) { animation-delay: 0.08s, 1.25s; }
.preloader .pl-arc:nth-child(3) { animation-delay: 0.16s, 1.25s; }
.preloader .pl-arc:nth-child(4) { animation-delay: 0.24s, 1.25s; }
.preloader .pl-core {
  fill: var(--aurum);
  transform-origin: 32px 32px;
  transform: scale(0);
  animation:
    pl-core-in 0.7s var(--ease-out) 0.45s forwards,
    pl-arc-open 0.85s var(--ease-io) 1.25s forwards;
}
@keyframes pl-arc-in {
  from { opacity: 0; transform: rotate(-110deg) scale(0.55); }
  to { opacity: 1; transform: rotate(0deg) scale(1); }
}
@keyframes pl-core-in {
  from { transform: scale(0); }
  to { transform: scale(1); }
}
@keyframes pl-arc-open {
  to { opacity: 0; transform: rotate(28deg) scale(1.9); }
}
@keyframes pl-gone {
  to { opacity: 0; visibility: hidden; }
}
@media (prefers-reduced-motion: reduce) {
  .preloader { display: none; }
}

/* ---------- HUD ---------- */
.hud-top {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.35rem var(--pad-x);
  pointer-events: none;
}
.hud-top > * { pointer-events: auto; }

.hud-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--porcelain);
}
.hud-brand svg {
  width: 26px;
  height: 26px;
  --sigil-stroke: var(--silver);
  --sigil-fill: var(--aurum);
  transition: transform 0.9s var(--ease-out);
}
.hud-brand:hover svg { --sigil-stroke: var(--aurum); transform: rotate(40deg); }
.hud-brand span {
  font-family: var(--mono);
  font-size: var(--fs-label);
  font-weight: 400;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}
.hud-brand span b { font-weight: 500; }

.hud-links {
  display: flex;
  gap: 2rem;
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: 0.24em;
  text-transform: uppercase;
}
.hud-links a { color: var(--silver-dim); }
.hud-links a:hover, .hud-links a[aria-current="page"] { color: var(--porcelain); }
.hud-links a[aria-current="page"] { border-bottom: 1px solid var(--aurum); padding-bottom: 2px; }

/* chapter index — right rail */
.hud-index {
  position: fixed;
  right: var(--pad-x);
  top: 50%;
  transform: translateY(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  align-items: flex-end;
}
.hud-index a {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  color: var(--silver-dim);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  transition: color 0.4s ease;
}
.hud-index a::after {
  content: "";
  width: 14px;
  height: 1px;
  background: currentColor;
  transition: width 0.5s var(--ease-out);
}
.hud-index a:hover { color: var(--silver); }
.hud-index a[aria-current="true"] { color: var(--aurum); }
.hud-index a[aria-current="true"]::after { width: 30px; }

.hud-bottom {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding: 1.2rem var(--pad-x);
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--silver-dim);
  pointer-events: none;
}
.hud-bottom .hud-chapter { text-align: right; }
.hud-bottom .hud-chapter em {
  font-style: normal;
  color: var(--silver-dim);
}
.hud-progress {
  display: block;
  width: 120px;
  height: 1px;
  background: var(--line);
  margin-top: 0.6rem;
  margin-left: auto;
  position: relative;
  overflow: hidden;
}
.hud-progress i {
  position: absolute;
  inset: 0;
  background: var(--aurum);
  transform-origin: left;
  transform: scaleX(0);
}

/* stand down while the footer is on stage */
.hud-top, .hud-bottom, .hud-index { transition: opacity 0.45s ease; }
body.footer-in .hud-top,
body.footer-in .hud-bottom,
body.footer-in .hud-index { opacity: 0; pointer-events: none; }
@media (prefers-reduced-motion: reduce) {
  .hud-top, .hud-bottom, .hud-index { transition: none; }
}

@media (max-width: 820px) {
  .hud-index { display: none; }
  .hud-links { gap: 1.1rem; letter-spacing: 0.16em; }
  .hud-bottom .hud-coords { display: none; }
}

/* ---------- chapters ---------- */
main { position: relative; z-index: 10; }

.chapter {
  min-height: 100svh;
  display: grid;
  align-content: center;
  padding: clamp(6rem, 14vh, 9rem) var(--pad-x);
  position: relative;
}
.chapter-inner { width: 100%; max-width: 1180px; margin: 0 auto; }

.ch-label {
  font-family: var(--mono);
  font-size: var(--fs-label);
  font-weight: 400;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--silver-dim);
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin-bottom: clamp(1.8rem, 4vh, 3rem);
}
.ch-label::before {
  content: "";
  width: 2.6rem;
  height: 1px;
  background: var(--aurum-dim);
}
.ch-label .num { color: var(--aurum); }

.chapter h2 {
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-size: var(--fs-h2);
  font-weight: 380;
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--porcelain);
  max-width: 15em;
  text-wrap: balance;
}
.chapter h2 em {
  font-style: italic;
  font-weight: 340;
  color: var(--silver);
}

.chapter .lede {
  max-width: var(--measure);
  color: var(--silver);
  margin-top: clamp(1.6rem, 3.5vh, 2.6rem);
  font-weight: 400;
}
.chapter .lede + .lede { margin-top: 1.2rem; }

/* word-rise reveal */
.rise .w {
  display: inline-block;
  overflow: hidden;
  vertical-align: bottom;
}
.rise .w > span {
  display: inline-block;
  transform: translateY(115%);
  transition: transform var(--dur-slow) var(--ease-out);
  transition-delay: calc(var(--i, 0) * 70ms);
}
.rise.in .w > span { transform: none; }

.fade {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
  transition-delay: calc(var(--d, 0) * 1ms);
}
.fade.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .rise .w > span { transform: none; transition: none; }
  .fade { opacity: 1; transform: none; transition: none; }
  .scene { transform: none !important; }
}

/* ---------- 00 arrival ---------- */
.arrival { text-align: center; }
.arrival .ch-label { justify-content: center; }
.arrival .ch-label::before { display: none; }

/* one restrained pool of light behind the title */
.arrival::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(46% 34% at 50% 44%, rgba(174, 190, 205, 0.075), transparent 70%),
    radial-gradient(20% 15% at 50% 46%, rgba(184, 155, 94, 0.06), transparent 75%);
}

.wordmark {
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-size: var(--fs-hero);
  font-weight: 380;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--porcelain);
  position: relative;
  display: inline-block;
}
.wordmark .lig { letter-spacing: -0.055em; }
.wordmark .a-it {
  font-style: italic;
  font-weight: 330;
  letter-spacing: -0.01em;
}

/* credit-roll entrance: four masked chunks rise as the aperture opens */
.wordmark .wm {
  display: inline-block;
  overflow: hidden;
  vertical-align: bottom;
  padding: 0.1em 0.06em 0.03em;
  margin: -0.1em -0.06em -0.03em;
}
.wordmark .wl { display: inline-block; }
@media (prefers-reduced-motion: no-preference) {
  .wordmark .wl {
    transform: translateY(118%);
    animation: wm-rise 1.35s var(--ease-out) forwards;
    animation-delay: calc(1.02s + var(--wl, 0) * 130ms);
  }
  .wordmark .lig-stroke path {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: lig-draw 1.7s var(--ease-io) 2.1s forwards;
  }
  .arrival .subline {
    opacity: 0;
    letter-spacing: 1em;
    text-indent: 1em;
    animation: sub-in 1.6s var(--ease-out) 1.85s forwards;
  }
}
@keyframes wm-rise { to { transform: none; } }
@keyframes lig-draw { to { stroke-dashoffset: 0; } }
@keyframes sub-in {
  to { opacity: 1; letter-spacing: 0.62em; text-indent: 0.62em; }
}

/* first-load choreography: arrival copy holds until the aperture has opened */
body.intro .arrival .fade { transition-delay: calc(var(--d, 0) * 1ms + 1750ms); }
/* the ligature hairline: r → v swash, drawn in em units over the type */
.wordmark .lig-stroke {
  position: absolute;
  left: 0; top: 0;
  width: 100%; height: 100%;
  overflow: visible;
  pointer-events: none;
}
.wordmark .lig-stroke path {
  fill: none;
  stroke: var(--aurum);
  stroke-width: 1.1;
  opacity: 0.9;
}

.arrival .subline {
  display: block;
  font-family: var(--mono);
  font-size: clamp(0.68rem, 1.3vw, 0.85rem);
  letter-spacing: 0.62em;
  text-indent: 0.62em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-top: clamp(1.2rem, 3vh, 2rem);
}
.arrival .sentence {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 1rem + 0.9vw, 1.5rem);
  font-weight: 360;
  font-style: italic;
  line-height: 1.55;
  color: var(--silver);
  max-width: 33em;
  margin: clamp(2.2rem, 6vh, 4rem) auto 0;
  text-wrap: balance;
}
.arrival .sentence .au { color: var(--aurum); font-style: italic; }

.begin {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
  margin-top: clamp(2.4rem, 7vh, 4.5rem);
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  text-transform: uppercase;
  color: var(--silver-dim);
}
.begin::after {
  content: "";
  width: 1px;
  height: 3.4rem;
  background: linear-gradient(var(--aurum), transparent);
}
.begin:hover { color: var(--silver); }
@media (prefers-reduced-motion: no-preference) {
  .begin::after { animation: begin-drop 2.6s var(--ease-io) infinite; }
}
@keyframes begin-drop {
  0% { transform: scaleY(0); transform-origin: top; }
  45% { transform: scaleY(1); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- 01 thesis ---------- */
.thesis-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 6vw, 7rem);
  align-items: start;
}
.thesis-copy p { max-width: var(--measure); color: var(--silver); }
.thesis-copy p + p { margin-top: 1.3rem; }
.thesis-copy .first-line::first-letter {
  font-family: var(--serif);
  font-size: 3.1em;
  font-weight: 380;
  float: left;
  line-height: 0.82;
  padding: 0.06em 0.14em 0 0;
  color: var(--porcelain);
}
.pull {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 340;
  font-size: clamp(1.35rem, 1.1rem + 1.4vw, 2rem);
  line-height: 1.4;
  color: var(--porcelain);
  border-left: 1px solid var(--aurum);
  padding-left: clamp(1.2rem, 2.5vw, 2rem);
  margin-top: clamp(2rem, 5vh, 3.2rem);
  max-width: 22em;
  text-wrap: balance;
}
.pull .fine {
  display: block;
  margin-top: 1.1rem;
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--aurum);
}
@media (max-width: 860px) {
  .thesis-grid { grid-template-columns: 1fr; }
}

/* ---------- 02 practice ---------- */
.movements {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-top: clamp(2.5rem, 6vh, 4rem);
}
.movement {
  background: color-mix(in srgb, var(--graphite) 62%, transparent);
  backdrop-filter: blur(2px);
  padding: clamp(1.8rem, 3.2vw, 3rem) clamp(1.4rem, 2.4vw, 2.4rem) clamp(2.2rem, 4vw, 3.4rem);
  position: relative;
  transition: background 0.6s ease;
}
.movement:hover { background: color-mix(in srgb, var(--graphite-2) 78%, transparent); }
.movement::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 1px;
  background: var(--aurum);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.9s var(--ease-out);
}
.movement:hover::before { transform: scaleX(1); }
.movement .numeral {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 3.4vw, 3.4rem);
  font-weight: 330;
  font-style: italic;
  color: var(--aurum);
  line-height: 1;
}
.movement h3 {
  font-family: var(--serif);
  font-size: var(--fs-h3);
  font-weight: 400;
  line-height: 1.18;
  color: var(--porcelain);
  margin: 1.3rem 0 0.4rem;
  letter-spacing: -0.01em;
}
.movement .role {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-bottom: 1.1rem;
}
.movement p { font-size: 0.975rem; color: var(--silver-dim); line-height: 1.75; }
@media (max-width: 940px) {
  .movements { grid-template-columns: 1fr; }
}

/* ---------- 03 approach ---------- */
.approach-intro {
  max-width: var(--measure);
  margin-top: clamp(1.6rem, 3.5vh, 2.6rem);
  color: var(--silver);
}
.principles { margin-top: clamp(2.6rem, 6vh, 4.2rem); }
.principle {
  display: grid;
  grid-template-columns: minmax(9em, 0.6fr) minmax(0, 1.6fr);
  gap: clamp(1.5rem, 4vw, 5rem);
  padding: clamp(1.7rem, 3.5vh, 2.6rem) 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}
.principle:last-child { border-bottom: 1px solid var(--line); }
.principle h3 {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 1.2rem + 1.6vw, 2.4rem);
  font-weight: 360;
  font-style: italic;
  letter-spacing: -0.01em;
  color: var(--porcelain);
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
}
.principle h3 .tick {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.625rem;
  letter-spacing: 0.26em;
  color: var(--aurum);
}
.principle p { max-width: 36em; color: var(--silver-dim); }
@media (max-width: 720px) {
  .principle { grid-template-columns: 1fr; gap: 0.8rem; }
}

/* ---------- 04 / 05 bridges ---------- */
.bridge .kicker {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--aurum);
  margin-bottom: 1.4rem;
}
.bridge h2 .tm {
  font-size: 0.32em;
  vertical-align: super;
  letter-spacing: 0.08em;
  color: var(--silver-dim);
  font-style: normal;
}
.bridge .lede { max-width: 36em; }
.bridge-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 2.4rem;
  margin-top: clamp(1.6rem, 3vh, 2.2rem);
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--silver-dim);
}
.cta {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  margin-top: clamp(2.2rem, 5vh, 3.4rem);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--porcelain);
  border: 1px solid var(--line-strong);
  padding: 1.05rem 1.7rem;
  position: relative;
  overflow: hidden;
  transition: color 0.45s ease, border-color 0.45s ease;
}
.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--aurum);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.65s var(--ease-out);
  z-index: -1;
}
.cta:hover { color: var(--obsidian); border-color: var(--aurum); }
.cta:hover::before { transform: scaleX(1); }
.cta .arrow { transition: transform 0.45s var(--ease-out); }
.cta:hover .arrow { transform: translateX(6px); }
@media (prefers-reduced-motion: reduce) {
  .cta::before { transition: none; }
  .cta .arrow { transition: none; }
}

/* ---------- 06 correspondence ---------- */
.letter {
  max-width: 620px;
  margin-top: clamp(2.4rem, 5vh, 3.6rem);
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--graphite) 70%, transparent);
  backdrop-filter: blur(3px);
  padding: clamp(1.8rem, 4vw, 3.2rem);
  position: relative;
}
.letter::before {
  content: "";
  position: absolute;
  top: 10px; left: 10px; right: 10px; bottom: 10px;
  border: 1px solid rgba(184, 155, 94, 0.18);
  pointer-events: none;
}
.letter .salutation {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 360;
  font-size: clamp(1.2rem, 1.05rem + 0.8vw, 1.55rem);
  color: var(--porcelain);
  margin-bottom: 2.2rem;
}
.letter .fieldrow { margin-bottom: 1.9rem; }
.letter label {
  display: block;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-bottom: 0.55rem;
}
.letter label .opt { color: var(--silver-dim); letter-spacing: 0.18em; }
.letter input,
.letter textarea {
  width: 100%;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  color: var(--porcelain);
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 380;
  padding: 0.35rem 0 0.6rem;
  border-radius: 0;
  transition: border-color 0.4s ease;
}
.letter textarea { resize: vertical; min-height: 7.5rem; line-height: 1.6; }
.letter input:focus,
.letter textarea:focus {
  outline: none;
  border-bottom-color: var(--aurum);
}
.letter input:focus-visible,
.letter textarea:focus-visible { outline: none; }
.letter ::placeholder { color: var(--silver-faint); font-style: italic; }
.letter .send {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  background: transparent;
  border: 1px solid var(--aurum-dim);
  color: var(--porcelain);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  padding: 1rem 1.6rem;
  cursor: pointer;
  margin-top: 0.4rem;
  transition: background 0.45s ease, color 0.45s ease;
}
.letter .send svg {
  width: 17px;
  height: 17px;
  --sigil-stroke: currentColor;
  --sigil-fill: currentColor;
}
.letter .send:hover { background: var(--aurum); color: var(--obsidian); border-color: var(--aurum); }
.letter .postscript {
  margin-top: 1.8rem;
  font-size: 0.85rem;
  color: var(--silver-dim);
  font-style: italic;
  font-family: var(--serif);
}
.letter-success {
  border-color: var(--aurum-dim);
}
.letter-success .salutation { margin-bottom: 1rem; }
.letter-success p { color: var(--silver); max-width: 30em; }
.hidden { display: none !important; }
/* honeypot */
.bp-field { position: absolute; left: -6000px; opacity: 0; }

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  z-index: 10;
  border-top: 1px solid var(--line);
  padding: clamp(3rem, 7vh, 5rem) var(--pad-x) clamp(2rem, 4vh, 3rem);
  background: linear-gradient(rgba(7, 9, 13, 0.4), rgba(7, 9, 13, 0.92));
}
.footer-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, minmax(8rem, 1fr));
  gap: 2.5rem;
}
.footer-brand svg {
  width: 34px;
  height: 34px;
  margin-bottom: 1.1rem;
  --sigil-stroke: var(--silver-dim);
  --sigil-fill: var(--aurum);
}
.footer-brand .fb-name {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--porcelain);
  letter-spacing: -0.01em;
}
.footer-brand .fb-sub {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-top: 0.45rem;
}
.footer-col h4 {
  font-family: var(--mono);
  font-size: 0.625rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--aurum);
  margin-bottom: 1.1rem;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.55rem; }
.footer-col a {
  color: var(--silver-dim);
  font-size: 0.9rem;
}
.footer-col a:hover { color: var(--porcelain); }
.footer-hud {
  max-width: 1180px;
  margin: clamp(2.5rem, 5vh, 4rem) auto 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.8rem 2rem;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--silver-dim);
}
.footer-hud a { color: var(--silver-dim); }
.footer-hud a:hover { color: var(--aurum); }
@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}

/* ---------- scene dolly (scroll camera) ---------- */
.scene { will-change: transform, opacity; }

/* ============================================================
   GUIDE / PROCESS — editorial pages
   ============================================================ */
.doc-page { background: var(--obsidian); }
.doc-page main { padding: 0 var(--pad-x); }
.doc-page .field-canvas { opacity: 0.42; }
.doc-page .grain { opacity: 0.06; }
/* doc pages scroll continuous text beneath the HUD — scrim keeps the brand legible */
.doc-page .hud-top {
  background: linear-gradient(to bottom, rgba(7, 9, 13, 0.92) 40%, transparent);
  padding-bottom: 2.2rem;
}

.doc-hero .doc-kicker {
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--aurum);
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin-bottom: 1.8rem;
}
.doc-hero .doc-kicker::before {
  content: "";
  width: 2.6rem;
  height: 1px;
  background: var(--aurum-dim);
}

.doc-hero {
  min-height: 62svh;
  display: grid;
  align-content: end;
  max-width: 900px;
  margin: 0 auto;
  padding: clamp(8rem, 18vh, 12rem) 0 clamp(3rem, 7vh, 5rem);
}
.doc-hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 2rem + 4vw, 5.4rem);
  font-weight: 380;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--porcelain);
  text-wrap: balance;
}
.doc-hero h1 em { font-style: italic; font-weight: 340; }
.doc-hero .doc-standfirst {
  max-width: 36em;
  margin-top: 1.8rem;
  color: var(--silver);
  font-size: 1.1rem;
}

.doc-section {
  max-width: 900px;
  margin: 0 auto;
  padding: clamp(2.6rem, 6vh, 4.2rem) 0;
  border-top: 1px solid var(--line);
  content-visibility: auto;
  contain-intrinsic-size: auto 640px;
}
.doc-section h2 {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 1.3rem + 1.8vw, 2.6rem);
  font-weight: 390;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--porcelain);
  margin-bottom: 1.6rem;
  max-width: 18em;
}
.doc-section h3 {
  font-family: var(--sans);
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--porcelain);
  margin: 2.1rem 0 0.7rem;
}
.doc-section p { max-width: var(--measure); color: var(--silver-dim); margin-bottom: 1.1rem; }
.doc-section p strong { color: var(--silver); font-weight: 500; }
.doc-section a { border-bottom: 1px solid var(--aurum-dim); }
.doc-section a:hover { border-bottom-color: var(--aurum); }
.doc-section ul { max-width: var(--measure); list-style: none; margin-bottom: 1.1rem; }
.doc-section ul li {
  color: var(--silver-dim);
  padding-left: 1.4rem;
  position: relative;
  margin-bottom: 0.7rem;
}
.doc-section ul li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--aurum);
}
.doc-section .sec-label {
  font-family: var(--mono);
  font-size: var(--fs-label);
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--aurum);
  margin-bottom: 1.3rem;
  display: block;
}

pre {
  background: var(--graphite);
  border: 1px solid var(--line);
  padding: 1.3rem 1.5rem;
  overflow-x: auto;
  margin: 1.4rem 0 1.6rem;
  max-width: 100%;
}
pre code {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 400;
  line-height: 1.65;
  color: var(--silver);
}
code .c { color: var(--silver-dim); }
code .k { color: var(--aurum); }
p code, li code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--porcelain);
  background: var(--graphite);
  padding: 0.12em 0.4em;
  border: 1px solid var(--line);
}

/* palette specimen */
.swatches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 1.6rem 0;
}
.swatch { padding: 1.2rem 1rem 4.5rem; }
.swatch .sw-name {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  display: block;
}
.swatch .sw-hex {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  opacity: 0.7;
  display: block;
  margin-top: 0.3rem;
}

/* type specimen */
.type-specimen {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--graphite) 55%, transparent);
  padding: clamp(1.6rem, 4vw, 3rem);
  margin: 1.6rem 0;
}
.type-specimen .ts-row { padding: 1.1rem 0; border-bottom: 1px solid var(--line); }
.type-specimen .ts-row:last-child { border-bottom: 0; }
.type-specimen .ts-note {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-bottom: 0.5rem;
  display: block;
}
.ts-display {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 380;
  color: var(--porcelain);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.ts-display em { font-weight: 330; }
.ts-body { color: var(--silver); max-width: 30em; }
.ts-mono {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--silver-dim);
}

/* sigil anatomy figure */
.sigil-figure {
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: clamp(1.6rem, 4vw, 3rem);
  align-items: center;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--graphite) 55%, transparent);
  padding: clamp(1.6rem, 4vw, 3rem);
  margin: 1.6rem 0;
}
.sigil-figure svg {
  width: 100%;
  height: auto;
  --sigil-stroke: var(--silver);
  --sigil-fill: var(--aurum);
}
@media (max-width: 640px) {
  .sigil-figure { grid-template-columns: 1fr; }
  .sigil-figure svg { max-width: 200px; }
}

/* pass log */
.passlog { border-top: 1px solid var(--line); }
.passlog .pass {
  display: grid;
  grid-template-columns: minmax(8em, 0.45fr) 1.55fr;
  gap: 1.5rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}
.passlog .pass h3 {
  margin: 0;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 360;
  font-size: 1.3rem;
  color: var(--porcelain);
}
.passlog .pass .pass-kicker {
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--aurum);
  display: block;
  margin-bottom: 0.4rem;
}
@media (max-width: 640px) {
  .passlog .pass { grid-template-columns: 1fr; gap: 0.6rem; }
}

/* doc footer nav */
.doc-nav {
  max-width: 900px;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vh, 4rem) 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}
.doc-nav a { color: var(--silver-dim); }
.doc-nav a:hover { color: var(--aurum); }