/* ARCLITH One — concept processor. One deliberate dark world: clean-room ink, copper, ice. */
:root {
  --ink: #07080a;
  --panel: #0e1013;
  --panel-2: #14171b;
  --line: rgba(232, 241, 255, 0.1);
  --line-2: rgba(232, 241, 255, 0.2);
  --text: #e6ebf2;
  --muted: #8b94a2;
  --dim: #5b6370;
  --copper: #d9824a;
  --copper-hi: #f0a56e;
  --ice: #e8f1ff;
  --display: 'Unbounded', 'Helvetica Neue', Arial, sans-serif;
  --body: 'Geist', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --pad: clamp(20px, 4vw, 64px);
  --ease: cubic-bezier(0.2, 0.7, 0.1, 1);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { background: var(--ink); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ink); color: var(--text); font: 400 16px/1.6 var(--body); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
h1, h2, h3, p { margin: 0; }
:focus-visible { outline: 2px solid var(--copper); outline-offset: 4px; }
::selection { background: var(--copper); color: var(--ink); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.skip { position: fixed; left: 16px; top: -60px; z-index: 200; padding: 10px 16px; background: var(--copper); color: var(--ink); border-radius: 6px; }
.skip:focus { top: 12px; }

/* ---------- shared type ---------- */
.eyebrow { font: 500 11px/1.4 var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.eyebrow .idx { color: var(--copper); }
.display { font: 300 clamp(40px, 5.6vw, 92px)/0.98 var(--display); letter-spacing: -0.035em; text-wrap: balance; }
.display em { font-style: normal; color: var(--copper); }
.lede { max-width: 34em; margin-top: 22px; color: var(--muted); font-size: 17px; text-wrap: pretty; }

.btn { display: inline-flex; align-items: center; gap: 10px; height: 46px; padding: 0 20px; border-radius: 999px; font: 500 14px var(--body); letter-spacing: 0.01em; transition: background 0.3s, color 0.3s, border-color 0.3s, transform 0.4s var(--ease); }
.btn i { font-style: normal; transition: transform 0.4s var(--ease); }
.btn:hover i { transform: translateX(3px); }
.btn-copper { background: var(--copper); color: #1a0d05; }
.btn-copper:hover { background: var(--copper-hi); }
.btn-ghost { border: 1px solid var(--line-2); }
.btn-ghost:hover { border-color: var(--ice); }

.wordmark { font: 500 17px var(--display); letter-spacing: 0.22em; display: inline-flex; align-items: center; gap: 10px; }
.wordmark i { width: 9px; height: 9px; border: 1.5px solid var(--copper); transform: rotate(45deg); }

/* ---------- loader ---------- */
.loader { position: fixed; inset: 0; z-index: 100; background: var(--ink); display: grid; place-content: center; justify-items: center; gap: 26px; transition: opacity 0.9s var(--ease), visibility 0s 0.9s; }
.loader.done { opacity: 0; visibility: hidden; }
.loader-mark { font: 300 clamp(28px, 4vw, 44px) var(--display); letter-spacing: 0.3em; display: inline-flex; gap: 14px; align-items: center; }
.loader-mark i { width: 12px; height: 12px; border: 2px solid var(--copper); transform: rotate(45deg); animation: spin 2.4s linear infinite; }
@keyframes spin { to { transform: rotate(405deg); } }
.loader-bar { width: min(260px, 60vw); height: 1px; background: var(--line); overflow: hidden; }
.loader-bar b { display: block; height: 100%; background: var(--copper); transform-origin: left; transform: scaleX(0); }
.loader-pct { font: 400 12px var(--mono); color: var(--muted); letter-spacing: 0.12em; }
.loader-pct b { font-weight: 400; color: var(--text); }
[data-studio] .loader { display: none; }

/* ---------- nav ---------- */
.nav { position: fixed; inset: 0 0 auto; z-index: 50; height: 72px; padding: 0 var(--pad); display: flex; align-items: center; gap: 40px; transition: background 0.5s, border-color 0.5s; border-bottom: 1px solid transparent; }
.nav.solid { background: rgba(7, 8, 10, 0.78); backdrop-filter: blur(16px); border-color: var(--line); }
.nav-links { display: flex; gap: 28px; margin-left: auto; }
.nav-links a { font: 500 13px var(--body); color: var(--muted); position: relative; padding: 6px 0; transition: color 0.3s; }
.nav-links a::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--copper); transform: scaleX(0); transform-origin: left; transition: transform 0.5s var(--ease); }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a.active::after { transform: scaleX(1); }
.nav-cta { height: 40px; }

/* ---------- descent (scroll film) ---------- */
.scrub { position: relative; height: 1150vh; }
.stage { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; }
#film { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.veil { position: absolute; inset: 0; pointer-events: none; background: linear-gradient(180deg, rgba(7, 8, 10, 0.55) 0%, transparent 22%, transparent 48%, rgba(7, 8, 10, 0.88) 100%), linear-gradient(90deg, rgba(7, 8, 10, 0.55) 0%, transparent 45%, transparent 60%, rgba(7, 8, 10, 0.45) 100%); }
.beat .eyebrow, .stage-no, .concept-note { text-shadow: 0 1px 12px rgba(7, 8, 10, 0.9), 0 0 2px rgba(7, 8, 10, 0.8); }
.beat-hero .eyebrow, .concept-note { color: #c4ccd8; }
.beat { position: absolute; opacity: 0; visibility: hidden; will-change: opacity, transform; }
.beat-hero { left: var(--pad); right: var(--pad); bottom: 15vh; }
.hero-title { font: 300 clamp(60px, 12.5vw, 220px)/0.86 var(--display); letter-spacing: -0.05em; margin: 18px 0 26px; }
.hero-title span { color: var(--copper); }
.lede-hero { font: 300 clamp(20px, 2.2vw, 30px)/1.25 var(--body); max-width: 22em; }
.concept-note { margin-top: 14px; font: 400 12px var(--mono); color: var(--muted); letter-spacing: 0.08em; }
.scroll-cue { margin-top: 34px; display: flex; align-items: center; gap: 12px; font: 500 11px var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.scroll-cue span { width: 1px; height: 44px; background: linear-gradient(var(--copper), transparent); animation: cue 2.2s var(--ease) infinite; transform-origin: top; }
@keyframes cue { 0% { transform: scaleY(0); } 60% { transform: scaleY(1); opacity: 1; } 100% { transform: scaleY(1); opacity: 0; } }
.chapter-beat { bottom: 22vh; max-width: 30rem; }
.beat-left { left: var(--pad); }
.beat-right { right: var(--pad); }
.stage-no { font: 500 11px var(--mono); letter-spacing: 0.16em; text-transform: uppercase; color: var(--copper); margin-bottom: 14px; }
.chapter-beat h2 { font: 300 clamp(34px, 4vw, 64px)/1 var(--display); letter-spacing: -0.035em; margin-bottom: 16px; }
.chapter-beat .copy { color: #c3cad4; font-size: 17px; text-wrap: pretty; }

.hud { font: 400 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.hud dl { display: flex; gap: 26px; margin: 0; }
.hud div { display: grid; gap: 4px; }
.hud dt { color: var(--dim); }
.hud dd { margin: 0; color: var(--text); font-variant-numeric: tabular-nums; }
.hud-film { position: absolute; right: var(--pad); bottom: 5vh; display: grid; justify-items: end; gap: 18px; }
.hud-film dl { justify-content: flex-end; }
.scale { display: flex; align-items: center; gap: 14px; }
.scale-bar { position: relative; width: 120px; height: 9px; border-left: 1px solid var(--ice); border-right: 1px solid var(--ice); }
.scale-bar::before { content: ''; position: absolute; left: 0; right: 0; top: 4px; height: 1px; background: rgba(232, 241, 255, 0.35); }
.scale-bar i { position: absolute; left: 0; top: 4px; height: 1px; width: 100%; background: var(--ice); transform-origin: left; }
.scale b { font: 500 22px var(--mono); letter-spacing: 0; text-transform: none; color: var(--ice); min-width: 5.5ch; font-variant-numeric: tabular-nums; }
.stages { position: absolute; left: var(--pad); bottom: 5vh; list-style: none; margin: 0; padding: 0; display: flex; gap: 18px; }
.stages li { display: grid; grid-template-columns: auto auto; column-gap: 8px; row-gap: 8px; font: 400 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); transition: color 0.4s; }
.stages .bar { grid-column: 1 / -1; height: 1px; background: var(--line-2); position: relative; min-width: 72px; }
.stages .bar::after { content: ''; position: absolute; inset: 0; background: var(--copper); transform-origin: left; transform: scaleX(var(--fill, 0)); }
.stages li.active { color: var(--text); }
.stages .st-no { color: var(--copper); }

/* ---------- pinned anatomy ---------- */
.pinned { position: relative; }
.anatomy { height: 460vh; }
.pin { position: sticky; top: 0; height: 100vh; height: 100svh; overflow: hidden; }
#gl { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.leaders { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.leaders path { stroke: rgba(232, 241, 255, 0.45); stroke-width: 1; fill: none; }
.leaders circle { fill: var(--copper); }
.parts { list-style: none; margin: 0; padding: 0; position: absolute; inset: 0; pointer-events: none; }
.part { position: absolute; left: 0; top: 0; opacity: 0; display: grid; grid-template-columns: auto 1fr; column-gap: 10px; max-width: 240px; font-size: 13px; color: var(--muted); }
.part-no { font: 500 11px var(--mono); color: var(--copper); grid-column: 1; grid-row: 1 / span 2; padding-top: 3px; }
.part strong, .part span:last-child { grid-column: 2; }
.part.side-left { text-align: right; grid-template-columns: 1fr auto; }
.part.side-left .part-no { grid-column: 2; }
.part.side-left strong, .part.side-left span:last-child { grid-column: 1; }
.part strong { font: 500 15px var(--body); color: var(--text); }
.anatomy-head { position: absolute; left: var(--pad); bottom: 8vh; max-width: 30rem; }
.hud-anatomy { position: absolute; right: var(--pad); bottom: 8vh; display: flex; gap: 26px; margin: 0; }

/* ---------- figures ---------- */
.figures { padding: clamp(80px, 12vw, 160px) var(--pad) clamp(60px, 8vw, 110px); border-top: 1px solid var(--line); }
.fig-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); }
.figure { padding: 28px 24px 0 0; }
.figure + .figure { padding-left: 24px; border-left: 1px solid var(--line); }
.fig-value { font: 300 clamp(48px, 6vw, 96px)/1 var(--display); letter-spacing: -0.04em; font-variant-numeric: tabular-nums; }
.fig-value small { font: 400 0.28em var(--mono); letter-spacing: 0.06em; color: var(--copper); margin-left: 8px; vertical-align: 0.9em; }
.fig-label { margin-top: 14px; color: var(--muted); font-size: 14px; max-width: 18em; }
.fig-note { margin-top: 36px; font: 400 12px var(--mono); color: var(--dim); letter-spacing: 0.04em; }

/* ---------- die ---------- */
.die { padding: clamp(80px, 10vw, 140px) var(--pad); background: linear-gradient(180deg, var(--ink), #0a0b0e 40%, var(--ink)); border-top: 1px solid var(--line); }
.die-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 5vw, 80px); align-items: center; }
.workloads { display: inline-flex; margin-top: 36px; padding: 4px; border: 1px solid var(--line-2); border-radius: 999px; }
.workloads button { height: 38px; padding: 0 18px; border-radius: 999px; font: 500 13px var(--body); color: var(--muted); transition: background 0.3s, color 0.3s; }
.workloads button:hover { color: var(--text); }
.workloads button[aria-checked='true'] { background: var(--copper); color: #1a0d05; }
.block-info { margin-top: 36px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); min-height: 150px; }
.bi-kind { font: 500 11px var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--copper); }
.block-info h3 { font: 400 24px/1.2 var(--display); letter-spacing: -0.02em; margin: 10px 0 8px; }
.block-info p:last-child { color: var(--muted); font-size: 15px; }
.hud-die { display: flex; gap: 28px; margin: 28px 0 0; }
.hud-die dd { min-width: 7ch; }
.die-stage { position: relative; aspect-ratio: 1; border-radius: 18px; background: radial-gradient(80% 80% at 50% 45%, #121419, #07080a 75%); border: 1px solid var(--line); }
#dieMap { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: crosshair; touch-action: manipulation; }
.die-caption { position: absolute; left: 18px; bottom: 12px; font: 400 11px var(--mono); color: var(--dim); letter-spacing: 0.08em; }

/* ---------- specs ---------- */
.specs { padding: clamp(80px, 10vw, 140px) var(--pad); border-top: 1px solid var(--line); }
.specs-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: clamp(32px, 5vw, 80px); align-items: start; }
.spec-table { width: 100%; border-collapse: collapse; }
.spec-table tr { border-top: 1px solid var(--line); }
.spec-table tr:last-child { border-bottom: 1px solid var(--line); }
.spec-table th { text-align: left; font: 500 11px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); padding: 22px 24px 22px 0; width: 32%; vertical-align: top; }
.spec-table td { padding: 20px 0; font-size: 18px; }
.spec-table tr:hover td { color: var(--copper-hi); }

/* ---------- at scale ---------- */
.atscale { position: relative; height: 130vh; overflow: hidden; display: grid; place-items: center; text-align: center; }
.atscale-img { position: absolute; inset: -10% 0; background: center / cover no-repeat; opacity: 0.75; will-change: transform; }
.atscale::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, var(--ink) 0%, rgba(7, 8, 10, 0.35) 30%, rgba(7, 8, 10, 0.35) 70%, var(--ink) 100%); }
.atscale-inner { position: relative; z-index: 1; padding: 0 var(--pad); }
.atscale-inner .eyebrow { justify-content: center; }

/* ---------- finale + footer ---------- */
.finale { min-height: 90vh; display: grid; place-items: center; text-align: center; padding: 16vh var(--pad); }
.finale .eyebrow { justify-content: center; }
.finale-title { font: 300 clamp(44px, 7vw, 120px)/0.98 var(--display); letter-spacing: -0.045em; text-wrap: balance; }
.finale-actions { display: flex; gap: 12px; justify-content: center; margin-top: 44px; flex-wrap: wrap; }
.site-foot { border-top: 1px solid var(--line); padding: 72px var(--pad) 32px; }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1.4fr; gap: 40px; }
.foot-brand p { margin-top: 20px; color: var(--muted); max-width: 34em; font-size: 14px; }
.foot-col h3 { font: 500 11px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--dim); margin-bottom: 16px; }
.foot-col a, .foot-col p { display: block; color: var(--muted); font-size: 14px; margin-bottom: 8px; }
.foot-col a:hover { color: var(--copper); }
.foot-base { display: flex; justify-content: space-between; margin-top: 64px; font: 400 12px var(--mono); color: var(--dim); }
.foot-base a:hover { color: var(--copper); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav { gap: 16px; height: 64px; }
  .nav-cta { margin-left: auto; height: 38px; padding: 0 16px; }
  .beat-hero { bottom: 20vh; }
  .chapter-beat { left: var(--pad); right: var(--pad); bottom: 24vh; max-width: none; }
  .scroll-cue { display: none; }
  .stages { display: none; }
  .hud-film { left: var(--pad); right: var(--pad); justify-items: start; }
  .hud-film dl { justify-content: flex-start; }
  .part, .part.side-left { max-width: 46vw; font-size: 11px; grid-template-columns: auto 1fr; }
  .part.side-left .part-no { grid-column: 1; }
  .part.side-left strong { grid-column: 2; }
  .part span:last-child { display: none; }
  .anatomy-head { right: var(--pad); bottom: 12vh; }
  .anatomy-head .lede { display: none; }
  .hud-anatomy { top: 88px; bottom: auto; }
  .fig-grid { grid-template-columns: 1fr 1fr; }
  .figure:nth-child(3) { padding-left: 0; border-left: 0; }
  .figure:nth-child(n + 3) { border-top: 1px solid var(--line); margin-top: 28px; }
  .die-grid, .specs-grid { grid-template-columns: 1fr; }
  .spec-table th { width: 38%; }
  .spec-table td { font-size: 16px; }
  .foot-grid { grid-template-columns: 1fr; }
  .foot-base { flex-direction: column; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* the wordmark and the footer links were 16–22px tall on a phone */
@media (pointer: coarse), (max-width: 860px) {
  .nav .wordmark, .foot-col a, .foot-base a, header a { min-height: 44px; display: inline-flex; align-items: center; }
}