:root {
  --night: #050b18;
  --ink: #0b1526;
  --paper: #f5f6f8;
  --white: #ffffff;
  --line: #d9dde4;
  --muted: #5a6475;
  --blue: #0666b5;
  --blue-bright: #4a9be8;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", monospace;
  --gutter: clamp(16px, 4vw, 48px);
  --max: 1240px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-underline-offset: 3px; }
h1, h2, h3 { margin: 0; font-weight: 500; letter-spacing: -0.01em; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 22px;
  background: var(--blue);
  color: var(--white);
  font: 500 15px/1 var(--sans);
  text-decoration: none;
  border: 1px solid var(--blue);
  transition: background .2s, border-color .2s;
}
.btn:hover { background: #0877d1; border-color: #0877d1; }
.btn--ghost { background: transparent; border-color: rgba(255,255,255,.35); }
.btn--ghost:hover { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.6); }
.btn--small { padding: 10px 16px; font-size: 14px; }

/* Top bar */
.topbar {
  position: fixed; inset: 0 0 auto 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px var(--gutter);
  transition: background .3s, box-shadow .3s;
}
.topbar.is-solid { background: rgba(5, 11, 24, .92); backdrop-filter: blur(8px); box-shadow: 0 1px 0 rgba(255,255,255,.08); }
.topbar__logo img { width: 150px; }
.topbar__right { display: flex; align-items: center; gap: 20px; }
.lang { display: flex; gap: 2px; font: 500 12px/1 var(--mono); letter-spacing: .08em; }
.lang a { color: rgba(255,255,255,.55); text-decoration: none; padding: 6px 6px; }
.lang a:hover { color: var(--white); }
.lang a[aria-current] { color: var(--white); box-shadow: inset 0 -1px 0 var(--blue-bright); }

/* Hero */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: 140px var(--gutter) 40px;
  color: var(--white);
  background:
    linear-gradient(180deg, rgba(5,11,24,.55) 0%, rgba(5,11,24,.35) 40%, rgba(5,11,24,.95) 100%),
    url("assets/sky.jpg") center / cover no-repeat,
    var(--night);
  background:
    linear-gradient(180deg, rgba(5,11,24,.55) 0%, rgba(5,11,24,.35) 40%, rgba(5,11,24,.95) 100%),
    image-set(url("assets/sky.webp") type("image/webp"), url("assets/sky.jpg") type("image/jpeg")) center / cover no-repeat,
    var(--night);
  overflow: hidden;
}
.hero__inner { max-width: var(--max); width: 100%; margin: 0 auto; }
.kicker {
  font: 500 12px/1.4 var(--mono);
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--blue-bright);
  margin-bottom: 28px;
}
.hero h1 {
  font-weight: 300;
  font-size: clamp(38px, 6.4vw, 84px);
  line-height: 1.04;
  letter-spacing: -0.025em;
  max-width: 15em;
}
.hero h1 span { display: block; color: rgba(255,255,255,.62); }
.hero__lead {
  margin-top: 32px;
  max-width: 36em;
  font-size: clamp(17px, 1.6vw, 20px);
  color: rgba(255,255,255,.82);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }

/* Spectrum: absorption lines drift toward blue */
.spectrum { max-width: var(--max); width: 100%; margin: 72px auto 0; }
.spectrum__bar {
  position: relative; height: 10px;
  background: linear-gradient(90deg, #5b21b6 0%, #1d4ed8 16%, #0891b2 32%, #16a34a 48%, #eab308 64%, #ea580c 80%, #b91c1c 100%);
  opacity: .85;
}
.spectrum__bar span {
  position: absolute; top: -3px; bottom: -3px; left: var(--x);
  width: 2px; background: var(--night);
  animation: blueshift 2.4s cubic-bezier(.2,.7,.2,1) .6s both;
}
@keyframes blueshift { from { transform: translateX(0); } to { transform: translateX(-3.2vw); } }
.spectrum figcaption {
  margin-top: 12px;
  font: 400 12px/1.4 var(--mono);
  color: rgba(255,255,255,.55);
}
.spectrum figcaption b { color: var(--white); font-weight: 500; }

/* Fact sheet */
.facts { background: var(--night); color: var(--white); padding: 0 var(--gutter) 56px; }
.facts__grid {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid rgba(255,255,255,.14);
}
.facts__grid > div { padding: 24px 20px 0 0; }
.facts__grid > div + div { padding-left: 20px; border-left: 1px solid rgba(255,255,255,.14); }
.facts dt { font: 500 11px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.5); }
.facts dd { margin-top: 10px; font-size: clamp(26px, 2.8vw, 38px); font-weight: 300; line-height: 1.1; }
.facts dd small { display: block; margin-top: 8px; font-size: 13px; line-height: 1.4; color: rgba(255,255,255,.6); }

/* Dossier layout: sticky index + chapters */
.dossier {
  max-width: var(--max); margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid; grid-template-columns: 200px 1fr; gap: 64px;
}
.index { position: sticky; top: 96px; align-self: start; padding-top: 96px; min-width: 0; }
.index__title { font: 500 11px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; }
.index a {
  display: block; padding: 9px 0 9px 14px;
  border-left: 2px solid var(--line);
  color: var(--muted); text-decoration: none; font-size: 15px;
  transition: color .2s, border-color .2s;
}
.index a b { font: 500 12px var(--mono); margin-right: 10px; color: inherit; }
.index a:hover { color: var(--ink); }
.index a.is-active { color: var(--blue); border-left-color: var(--blue); }

.content { min-width: 0; }
.chapter { padding: 96px 0; border-bottom: 1px solid var(--line); }
.chapter:has(+ .chapter--ink) { border-bottom: 0; padding-bottom: 32px; }
.chapter__head { margin-bottom: 48px; }
.chapter__num { font: 500 12px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--blue); margin-bottom: 20px; }
.chapter h2 { font-size: clamp(28px, 3.4vw, 44px); line-height: 1.12; font-weight: 400; max-width: 20em; }
.chapter__lead { font-size: 19px; color: var(--muted); max-width: 38em; margin: -16px 0 48px; }

/* Services rows */
.rows { border-top: 1px solid var(--ink); }
.row {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 32px;
  padding: 28px 0; border-bottom: 1px solid var(--line);
}
.row h3 { font-size: 20px; }
.row li { position: relative; padding-left: 18px; color: var(--muted); }
.row li + li { margin-top: 6px; }
.row li::before { content: ""; position: absolute; left: 0; top: .72em; width: 8px; height: 1px; background: var(--blue); }

/* Governance (dark panel) */
.chapter--ink {
  background: var(--night); color: var(--white);
  padding: 80px clamp(24px, 5vw, 64px);
  margin: 64px 0; border-bottom: 0;
  position: relative; overflow: hidden;
}
.chapter--ink::after {
  content: ""; position: absolute; inset: 0;
  background: url("assets/sky.jpg") center / cover;
  background: image-set(url("assets/sky.webp") type("image/webp"), url("assets/sky.jpg") type("image/jpeg")) center / cover;
  opacity: .18; pointer-events: none;
}
.chapter--ink > * { position: relative; z-index: 1; }
.chapter--ink .chapter__num { color: var(--blue-bright); }
.chapter--ink .chapter__lead { color: rgba(255,255,255,.7); }
.checks { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.14); counter-reset: check; }
.checks li { background: rgba(5,11,24,.88); padding: 28px 24px; counter-increment: check; }
.checks li::before { content: "0" counter(check); display: block; font: 500 12px var(--mono); color: var(--blue-bright); margin-bottom: 18px; }
.checks h3 { font-size: 18px; margin-bottom: 8px; }
.checks p { font-size: 15px; color: rgba(255,255,255,.66); }
.signature { margin: 56px 0 0; }
.signature p { font: 400 clamp(22px, 2.6vw, 32px)/1.2 var(--mono); letter-spacing: -0.02em; }
.signature p::before { content: "$ "; color: var(--blue-bright); }
.signature p::after { content: "_"; color: var(--blue-bright); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* Work */
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.case { background: var(--white); border: 1px solid var(--line); padding: 32px 28px; display: flex; flex-direction: column; gap: 14px; }
.case__client { font: 500 11px/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--blue); }
.case h3 { font-size: 21px; line-height: 1.25; }
.case p { color: var(--muted); font-size: 15px; }
.case--figure { background: var(--blue); border-color: var(--blue); color: var(--white); }
.case--figure .case__client, .case--figure p { color: rgba(255,255,255,.78); }
.case__big { font-size: 64px !important; font-weight: 300; line-height: 1; color: var(--white) !important; letter-spacing: -0.03em; }
.tags { margin-top: auto; padding-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }
.tags span { font: 400 12px/1 var(--mono); padding: 6px 8px; border: 1px solid var(--line); color: var(--muted); }
.case--figure .tags span { border-color: rgba(255,255,255,.35); color: var(--white); }

.earlier { margin-top: 48px; display: flex; flex-wrap: wrap; align-items: baseline; gap: 16px 32px; }
.earlier__label { font: 500 12px/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.earlier__list { display: flex; flex-wrap: wrap; gap: 8px 32px; }
.earlier__list li { font-size: 22px; font-weight: 500; color: #8a93a3; letter-spacing: -0.01em; }

/* Engagement */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); position: relative; }
.steps::before { content: ""; position: absolute; top: 6px; left: 0; right: 0; height: 1px; background: var(--ink); }
.steps li { position: relative; padding: 36px 28px 0 0; }
.steps li::before { content: ""; position: absolute; top: 0; left: 0; width: 13px; height: 13px; background: var(--blue); border-radius: 50%; }
.steps__time { font: 500 12px var(--mono); color: var(--blue); letter-spacing: .06em; text-transform: uppercase; }
.steps h3 { font-size: 24px; margin: 10px 0 8px; }
.steps p { color: var(--muted); }
.models { margin-top: 64px; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.models > div { padding: 28px 28px 0 0; }
.models > div + div { padding-left: 28px; border-left: 1px solid var(--line); }
.models h3 { font-size: 18px; margin-bottom: 8px; }
.models p { color: var(--muted); font-size: 15px; }

/* Company */
.company { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 56px; }
.company__text p + p { margin-top: 18px; }
.company__text { font-size: 18px; }
.company__partners { padding: 18px 20px; border-left: 2px solid var(--blue); background: var(--white); font-size: 16px; color: var(--muted); }
.ledger { border-top: 1px solid var(--ink); }
.ledger div { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.ledger dt { white-space: nowrap; font: 400 12px/1.8 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.ledger dd { text-align: right; }
.subhead { font-size: 20px; margin: 72px 0 24px; }
.people { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.people li { background: var(--paper); padding: 22px 20px; display: flex; flex-direction: column; gap: 4px; }
.people b { font-weight: 500; }
.people span { font-size: 14px; color: var(--blue); }
.people small { font-size: 13px; color: var(--muted); line-height: 1.45; margin-top: 6px; }
.name { margin-top: 56px; display: grid; grid-template-columns: 200px 1fr; gap: 24px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--muted); }
.name__label { font: 500 12px/1.7 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--ink); }

/* Contact */
.chapter--contact { border-bottom: 0; }
.contact { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 56px; align-items: start; }
.contact__mail {
  font-size: clamp(26px, 3.6vw, 48px); font-weight: 300; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none; border-bottom: 2px solid var(--blue);
  overflow-wrap: anywhere; justify-self: start;
}
.contact__mail:hover { color: var(--blue); }
.contact__list { border-top: 1px solid var(--ink); }
.contact__list div { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.contact__list dt { white-space: nowrap; font: 400 12px/1.8 var(--mono); text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.contact__list dd { text-align: right; }
.contact__list a { color: var(--ink); }

/* Legal pages */
.legal { max-width: 760px; margin: 0 auto; padding: 150px var(--gutter) 96px; }
.legal h1 { font-size: clamp(30px, 4vw, 44px); line-height: 1.12; font-weight: 400; margin-bottom: 40px; }
.legal h2 { font-size: 20px; margin: 40px 0 12px; }
.legal p + p { margin-top: 12px; }
.legal ul { margin-top: 8px; }
.legal li { position: relative; padding-left: 18px; color: var(--muted); }
.legal li + li { margin-top: 6px; }
.legal li::before { content: ""; position: absolute; left: 0; top: .72em; width: 8px; height: 1px; background: var(--blue); }
.legal__note { font-size: 14px; color: var(--muted); margin: -24px 0 24px; }
.legal__back { margin-top: 56px !important; font: 500 14px var(--mono); }

/* Footer */
.footer { background: var(--night); color: rgba(255,255,255,.7); padding: 56px var(--gutter); text-align: center; }
.footer img { width: 140px; margin: 0 auto 18px; opacity: .9; }
.footer p { font: 400 13px/1.6 var(--mono); }
.footer__links { margin-top: 6px; }
.footer__links a { color: rgba(255,255,255,.7); }
.footer__legal { margin-top: 8px; color: rgba(255,255,255,.45); font-size: 12px !important; }

/* Responsive */
@media (max-width: 1080px) {
  .facts__grid { grid-template-columns: repeat(3, 1fr); }
  .facts__grid > div:nth-child(4) { padding-left: 0; border-left: 0; }
  .cases, .checks { grid-template-columns: 1fr 1fr; }
  .people { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 860px) {
  .dossier { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .index {
    top: 62px; z-index: 10; padding: 0;
    margin: 0 calc(var(--gutter) * -1);
    background: rgba(245,246,248,.95); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--line);
  }
  .index__title { display: none; }
  .index ol { display: flex; overflow-x: auto; padding: 0 var(--gutter); scrollbar-width: none; }
  .index ol::-webkit-scrollbar { display: none; }
  .index a { border-left: 0; border-bottom: 2px solid transparent; padding: 14px 12px; white-space: nowrap; }
  .index a.is-active { border-bottom-color: var(--blue); }
  .chapter { padding: 64px 0; }
  .chapter--ink { margin: 40px calc(var(--gutter) * -1); padding: 64px var(--gutter); }
  .row, .company, .contact, .name { grid-template-columns: 1fr; gap: 16px; }
  .company, .contact { gap: 40px; }
  .steps, .models { grid-template-columns: 1fr; }
  .steps::before { top: 0; bottom: 0; left: 6px; right: auto; width: 1px; height: auto; }
  .steps li { padding: 0 0 32px 36px; }
  .steps li::before { top: 4px; }
  .models > div, .models > div + div { padding: 24px 0 0; border-left: 0; }
  .models > div + div { margin-top: 24px; border-top: 1px solid var(--line); }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .topbar__logo img { width: 120px; }
  .topbar .btn--small { display: none; }
  .topbar__right { gap: 0; }
  .hero { min-height: auto; padding-top: 120px; }
  .facts__grid { grid-template-columns: 1fr 1fr; }
  .facts__grid > div, .facts__grid > div + div { padding: 20px 12px 0 0; border-left: 0; }
  .facts__grid > div:nth-child(even) { padding-left: 12px; border-left: 1px solid rgba(255,255,255,.14); }
  .cases, .checks, .people { grid-template-columns: 1fr; }
  .ledger div, .contact__list div { flex-direction: column; gap: 2px; }
  .ledger dd, .contact__list dd { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .spectrum__bar span { animation: none; transform: translateX(-3.2vw); }
  .signature p::after { animation: none; }
}