/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body, h1, h2, h3, p, dl, dd, dt, ol, figure { margin: 0; }
ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; background: none; border: none; cursor: pointer; }

/* ---------- Tokens ---------- */
:root{
  --paper: #f4f1ea;
  --paper-alt: #ece7dc;
  --ink: #17191d;
  --ink-soft: #52565f;
  --rule: #d9d2c2;
  --blue: #1f3a5f;
  --copper: #b5502c;
  --ink-dark: #12141a;
  --paper-on-dark: #eae6db;
  --soft-on-dark: #9aa0ab;
  --rule-on-dark: rgba(234,230,219,0.14);

  --serif: "Spectral", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;

  --max: 1180px;
}

body{
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.grain{
  position: fixed; inset: 0; z-index: 999; pointer-events: none;
  opacity: 0.035; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.wrap{ max-width: var(--max); margin: 0 auto; padding: 0 28px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.01em; }

.eyebrow{
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--copper);
}
.section--dark .eyebrow{ color: #d98a5e; }

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 13.5px; letter-spacing: 0.02em;
  padding: 13px 22px;
  border: 1px solid currentColor;
  border-radius: 2px;
  transition: background 0.18s ease, color 0.18s ease;
  white-space: nowrap;
}
.btn-primary{ background: var(--blue); color: var(--paper); border-color: var(--blue); }
.btn-primary:hover{ background: var(--copper); border-color: var(--copper); }
.section--dark .btn-primary{ background: var(--copper); border-color: var(--copper); color: var(--ink-dark); }
.section--dark .btn-primary:hover{ background: var(--paper-on-dark); border-color: var(--paper-on-dark); }
.btn-ghost{ color: var(--paper-on-dark); border-color: var(--rule-on-dark); }
.btn-ghost:hover{ border-color: var(--paper-on-dark); }
.btn-small{ padding: 9px 16px; font-size: 12.5px; }

/* ---------- Nav ---------- */
.nav{
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 20px 0;
  transition: background 0.25s ease, border-color 0.25s ease, padding 0.25s ease;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled{
  background: rgba(244,241,234,0.92);
  backdrop-filter: blur(6px);
  border-color: var(--rule);
  padding: 13px 0;
}
.nav-inner{
  max-width: var(--max); margin: 0 auto; padding: 0 28px;
  display: flex; align-items: center; gap: 28px;
}
.nav-mark{
  font-family: var(--mono); font-size: 17px; font-weight: 500;
  color: var(--paper-on-dark);
  margin-right: auto;
  letter-spacing: -0.01em;
  display: inline-flex; align-items: center;
}
.nav.is-scrolled .nav-mark{ color: var(--ink); }
.brand-dot{
  display: inline-block; width: 0.24em; height: 0.24em; border-radius: 50%;
  background: var(--copper); margin: 0 0.06em; flex-shrink: 0;
}
.nav-links{ display: flex; gap: 26px; }
.nav-links a{
  font-family: var(--mono); font-size: 13px; color: var(--soft-on-dark);
  transition: color 0.15s ease;
}
.nav.is-scrolled .nav-links a{ color: var(--ink-soft); }
.nav-links a:hover{ color: var(--paper-on-dark); }
.nav.is-scrolled .nav-links a:hover{ color: var(--ink); }
.nav .btn-small{ color: var(--paper-on-dark); border-color: var(--rule-on-dark); }
.nav.is-scrolled .btn-small{ color: var(--ink); border-color: var(--rule); }
.nav.is-scrolled .btn-small:hover{ background: var(--blue); border-color: var(--blue); color: var(--paper); }

.nav-toggle{ display: none; flex-direction: column; gap: 5px; padding: 4px; }
.nav-toggle span{ width: 22px; height: 1.5px; background: var(--paper-on-dark); transition: 0.2s; }
.nav.is-scrolled .nav-toggle span{ background: var(--ink); }
.nav-links-mobile{ display: none; }

@media (max-width: 860px){
  .nav-links{ display: none; }
  .nav .btn-small{ display: none; }
  .nav-toggle{ display: flex; }
  .nav-links-mobile{
    display: flex; flex-direction: column; gap: 0; margin: 0; width: 100%;
    background: var(--ink-dark);
    padding: 0 28px; overflow: hidden; max-height: 0;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }
  .nav.is-scrolled .nav-links-mobile{ background: var(--paper); }
  .nav-links-mobile.is-open{ max-height: 400px; padding: 14px 28px 20px; }
  .nav-links-mobile a{
    font-family: var(--mono); font-size: 14px; padding: 11px 0;
    border-bottom: 1px solid var(--rule-on-dark); color: var(--paper-on-dark);
  }
  .nav.is-scrolled .nav-links-mobile a{ color: var(--ink); border-color: var(--rule); }
}

/* ---------- Sections ---------- */
.section{ position: relative; padding: 128px 0; overflow: hidden; }
.section--alt{ background: var(--paper-alt); }
.section--dark{
  background: var(--ink-dark); color: var(--paper-on-dark);
  background-image:
    linear-gradient(var(--rule-on-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-on-dark) 1px, transparent 1px);
  background-size: 56px 56px;
}
.section--dark h2, .section--dark h3{ color: var(--paper-on-dark); }
.section--dark p{ color: var(--soft-on-dark); }

.section-head{ max-width: 720px; margin-bottom: 56px; }
.section-head .eyebrow{ margin-bottom: 14px; display: block; }
.section-head h2{ font-size: clamp(28px, 3.4vw, 40px); line-height: 1.2; }
.section-intro{ margin-top: 18px; font-size: 17px; color: var(--ink-soft); max-width: 620px; }

/* ---------- Hero ---------- */
.hero{ min-height: 100svh; display: flex; align-items: center; padding: 160px 0 120px; }
.hero canvas{
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0.55;
}
.hero-grid{
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--rule-on-dark) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-on-dark) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 75%);
}
.hero-content{ position: relative; z-index: 2; max-width: 840px; }
.hero-title{
  font-size: clamp(34px, 5.6vw, 64px);
  line-height: 1.08;
  color: var(--paper-on-dark);
  margin: 22px 0 26px;
  max-width: 15ch;
}
.hero-sub{
  font-size: clamp(16px, 1.6vw, 19px);
  color: var(--soft-on-dark);
  max-width: 52ch;
  margin-bottom: 40px;
}
.hero-cta{ display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll{
  position: absolute; bottom: 36px; left: 28px; z-index: 2;
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--soft-on-dark);
}
.hero-scroll span{
  width: 1px; height: 34px; background: var(--soft-on-dark);
  position: relative; overflow: hidden;
}
.fig-caption{
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.03em;
  color: var(--soft-on-dark); opacity: 0.75;
}
.fig-caption--hero{
  position: absolute; bottom: 36px; right: 28px; z-index: 2;
}
.fig-caption--orbit{
  position: absolute; left: 0; bottom: -22px;
  white-space: nowrap;
}
.hero-scroll span::after{
  content: ""; position: absolute; top: -100%; left: 0; width: 100%; height: 100%;
  background: var(--copper); animation: scrollline 2.2s ease-in-out infinite;
}
@keyframes scrollline{ 50%{ top: 0; } 100%{ top: 100%; } }

/* ---------- Problem / About split ---------- */
.split{ display: grid; grid-template-columns: 1fr 1.3fr; gap: 64px; }
.split-lead p{
  font-family: var(--serif); font-size: clamp(20px, 2vw, 24px);
  line-height: 1.4; color: inherit;
}
.split-body p{ margin-bottom: 18px; color: var(--ink-soft); font-size: 16px; }
.section--dark .split-body p{ color: var(--soft-on-dark); }
.split-body p:last-child{ margin-bottom: 0; }
.fine-print{ font-family: var(--mono); font-size: 12.5px; opacity: 0.7; line-height: 1.6; }
@media (max-width: 860px){
  .split{ grid-template-columns: 1fr; gap: 26px; }
}

/* ---------- Pull quote ---------- */
.pull-quote{
  font-family: var(--serif); font-size: clamp(22px, 2.6vw, 30px);
  color: var(--blue); max-width: 16ch; margin-bottom: 64px;
  border-left: 2px solid var(--copper); padding-left: 24px;
}

/* ---------- Process ---------- */
.process{
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 0;
  border-top: 1px solid var(--rule);
}
.process-step{
  padding: 26px 20px 0 0; border-right: 1px solid var(--rule);
  position: relative;
}
.process-step:last-child{ border-right: none; padding-right: 0; }
.process-num{
  font-family: var(--mono); font-size: 12.5px; color: var(--copper);
  display: block; margin-bottom: 14px;
}
.process-step h3{ font-size: 18px; margin-bottom: 10px; }
.process-step p{ font-size: 14.5px; color: var(--ink-soft); line-height: 1.5; }
@media (max-width: 980px){
  .process{ grid-template-columns: repeat(2, 1fr); }
  .process-step{ border-right: none; border-bottom: 1px solid var(--rule); padding: 26px 0 26px; }
  .process-step:nth-child(odd){ padding-right: 20px; }
}
@media (max-width: 560px){
  .process{ grid-template-columns: 1fr; }
}

/* ---------- Capabilities ---------- */
.cap-grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--rule); border: 1px solid var(--rule);
}
.cap-card{ background: var(--paper); padding: 32px 28px; }
.cap-icon{ width: 34px; height: 34px; color: var(--blue); margin-bottom: 20px; }
.cap-card h3{ font-size: 17px; margin-bottom: 10px; }
.cap-card p{ font-size: 14.5px; color: var(--ink-soft); line-height: 1.55; }
@media (max-width: 860px){ .cap-grid{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px){ .cap-grid{ grid-template-columns: 1fr; } }

/* ---------- Case studies ---------- */
.case-list{ display: flex; flex-direction: column; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.case{ background: var(--paper-alt); display: grid; grid-template-columns: 64px 1fr; gap: 0; padding: 40px 32px; }
.case-num{
  font-family: var(--serif); font-size: 34px; color: var(--rule);
  line-height: 1;
}
.case h3{ font-size: clamp(19px, 2vw, 22px); margin-bottom: 22px; max-width: 46ch; }
.case-grid{ display: grid; grid-template-columns: 120px 1fr; gap: 10px 24px; }
.case-grid dt{
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--copper); padding-top: 2px;
}
.case-grid dd{ font-size: 15px; color: var(--ink-soft); margin-bottom: 4px; }
@media (max-width: 760px){
  .case{ grid-template-columns: 1fr; padding: 32px 22px; }
  .case-num{ margin-bottom: 12px; }
  .case-grid{ grid-template-columns: 1fr; gap: 4px 0; }
  .case-grid dt{ margin-top: 12px; }
}

/* ---------- Orbit diagram (Research section) ---------- */
#research .wrap{ position: relative; z-index: 2; }
.orbit-diagram{
  position: absolute; top: 44px; right: 44px;
  width: 220px; height: 220px;
  color: var(--soft-on-dark); opacity: 0.7;
  pointer-events: none;
}
.orbit-sat{ transform-box: fill-box; transform-origin: center; }
@media (max-width: 1100px){ .orbit-diagram{ display: none; } }

/* ---------- Final CTA ---------- */
.cta-final{ text-align: center; padding: 140px 0; }
.cta-final h2{ font-size: clamp(28px, 4vw, 44px); max-width: 18ch; margin: 0 auto 16px; }
.cta-final p{ color: var(--soft-on-dark); margin-bottom: 36px; font-size: 17px; }

/* ---------- Footer ---------- */
.footer{ background: var(--ink-dark); color: var(--soft-on-dark); padding: 40px 0; }
.footer-inner{ display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-mark{ font-family: var(--mono); font-weight: 500; color: var(--paper-on-dark); font-size: 15px; display: inline-flex; align-items: center; }
.footer-meta{ font-family: var(--mono); font-size: 12px; margin-top: 4px; }
.footer-links{ display: flex; gap: 22px; font-family: var(--mono); font-size: 13px; }
.footer-links a:hover{ color: var(--paper-on-dark); }

@media (max-width: 640px){
  .section{ padding: 88px 0; }
  .hero{ padding: 140px 0 90px; }
}