:root {
  --bg: #faf7f2;
  --bg-alt: #f1ece3;
  --surface: #ffffff;
  --ink: #1c1a17;
  --muted: #5d574e;
  --line: #e2dbcf;
  --accent: #d9541e;
  --accent-soft: #f7e3d8;
  --accent-ink: #ffffff;
  --green: #2f5d46;
  --green-soft: #dde8e0;
  --cta-bg: #1c1a17;
  --cta-ink: #faf7f2;
  --radius: 14px;
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151412;
    --bg-alt: #1d1b18;
    --surface: #221f1c;
    --ink: #f1ece3;
    --muted: #b3aa9c;
    --line: #34302b;
    --accent: #f07a43;
    --accent-soft: #3a261c;
    --accent-ink: #151412;
    --green: #7fb394;
    --green-soft: #1f2d25;
    --cta-bg: #221f1c;
    --cta-ink: #f1ece3;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; margin: 0 0 .5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.4rem, 5.4vw, 4rem); max-width: 16ch; }
h1 em { font-style: italic; color: var(--accent); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; }
a { color: inherit; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font: 600 1.35rem var(--serif); text-decoration: none; }
.wordmark span { color: var(--accent); }
.logo-mark { width: 30px; height: 30px; flex: none; }
nav { display: flex; align-items: center; gap: 28px; }
nav a { text-decoration: none; font-size: .95rem; color: var(--muted); }
nav a:hover { color: var(--ink); }

/* Line-art graphics: colours come from the tokens so they follow dark mode */
.g-ink { stroke: var(--ink); }
.g-accent { stroke: var(--accent); }
.g-green { stroke: var(--green); }
.f-accent { fill: var(--accent); }
.f-green { fill: var(--green); }
.f-bg { fill: var(--bg); }
.f-surface { fill: var(--surface); }
.f-accent-soft { fill: var(--accent-soft); }
.stop-accent { stop-color: var(--accent); }
.stop-green { stop-color: var(--green); }

/* Buttons */
.btn {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  padding: 14px 26px; border-radius: 999px; text-decoration: none; font-weight: 600;
  transition: transform .15s ease, filter .15s ease;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
nav a.btn { color: var(--accent-ink); }
.btn-small { padding: 8px 18px; font-size: .9rem; }
.btn-light { background: var(--cta-ink); color: var(--cta-bg); }
.link-arrow { font-weight: 600; text-decoration: none; }
.link-arrow:hover { color: var(--accent); }

/* Hero */
.hero { padding: 100px 0 90px; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 40px; align-items: center; }
.hero-art { width: 100%; height: auto; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: .8rem; font-weight: 600; color: var(--accent); }
.lede { font-size: 1.2rem; color: var(--muted); max-width: 58ch; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 28px; margin-top: 36px; }

/* Sections */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-intro { color: var(--muted); max-width: 55ch; margin-bottom: 48px; }

/* Engineering / commercial bridge */
.bridge { display: grid; grid-template-columns: 1.1fr 1fr; gap: 56px; align-items: center; }
.bridge p { font-size: 1.1rem; color: var(--muted); }
.venn { width: 100%; max-width: 440px; height: auto; justify-self: center; }
.venn text { text-anchor: middle; font-family: var(--sans); }
.venn-title { font: 600 17px var(--serif); fill: var(--ink); }
.venn-sub { font-size: 13px; fill: var(--muted); }
.venn-mid { font: italic 600 16px var(--serif); fill: var(--ink); }

.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px;
}
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.card-icon {
  display: grid; place-items: center; width: 52px; height: 52px; border-radius: 12px;
  background: var(--accent-soft); color: var(--accent);
}
.card-icon svg { width: 28px; height: 28px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.card-num { font: 600 .85rem var(--sans); color: var(--muted); letter-spacing: .08em; }
.card-q { font: italic 400 1.15rem/1.4 var(--serif); color: var(--ink); }
.card p:last-child { color: var(--muted); margin: 0; }

/* Steps joined by a line */
.steps { position: relative; list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 36px; counter-reset: step; }
/* Connector from each step's circle to the next one */
.steps li:not(:last-child)::after {
  content: ""; position: absolute; top: 20px; left: 42px; right: -36px; height: 2px;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 50%, var(--green)));
}
.steps li:nth-child(2)::after { background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 50%, var(--green)), var(--green)); }
.steps li { position: relative; counter-increment: step; }
.steps li::before {
  content: counter(step); position: relative; z-index: 1;
  display: grid; place-items: center; width: 42px; height: 42px; margin-bottom: 20px;
  border-radius: 50%; border: 2px solid var(--accent); background: var(--bg);
  font: 600 1rem var(--sans); color: var(--accent);
}
.steps li:nth-child(2)::before { border-color: color-mix(in srgb, var(--accent) 50%, var(--green)); color: color-mix(in srgb, var(--accent) 50%, var(--green)); }
.steps li:last-child::before { border-color: var(--green); background: var(--green); color: var(--bg); }
.section-alt .steps li::before { background: var(--bg-alt); }
.section-alt .steps li:last-child::before { background: var(--green); color: var(--bg-alt); }
.diagram-label { font: 600 12px var(--sans); fill: var(--green); letter-spacing: .06em; text-transform: uppercase; }
.diagram-chip { font: 700 15px var(--sans); fill: var(--accent); text-anchor: middle; }
.diagram-caption { font: italic 600 14px var(--serif); fill: var(--ink); text-anchor: middle; }
.steps p { color: var(--muted); margin: 0; }

.about { display: grid; grid-template-columns: 1fr 2fr; gap: 48px; }
.about-body { font-size: 1.1rem; }
.portrait { display: block; width: 100%; max-width: 280px; height: auto; border-radius: var(--radius); margin-top: 12px; }
.hub { display: block; width: 100%; max-width: 280px; height: auto; margin-top: 8px; }
.ticks { list-style: none; padding: 0; margin: 0 0 28px; }
.ticks li { position: relative; padding-left: 28px; margin-bottom: 14px; color: var(--muted); }
.ticks li strong { color: var(--ink); font-weight: 600; }
.ticks li::before { content: "→"; position: absolute; left: 0; color: var(--accent); font-weight: 600; }

/* CTA */
.cta { background: var(--cta-bg); color: var(--cta-ink); padding: 96px 0; text-align: center; }
.cta p { opacity: .8; margin-bottom: 32px; }

/* Footer */
.site-footer { padding: 28px 0; font-size: .9rem; color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer a { text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  .pulse { display: none; }
}

/* Mobile */
@media (max-width: 760px) {
  nav a:not(.btn) { display: none; }
  .hero { padding: 56px 0 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 0; }
  .hero-art { order: -1; max-width: 260px; margin: 0 0 12px -10px; }
  .section, .cta { padding: 64px 0; }
  .cards, .about, .bridge { grid-template-columns: 1fr; }
  .bridge { gap: 24px; }
  .about { gap: 0; }
  .portrait { max-width: 200px; margin: 8px 0 28px; }
  .hub { max-width: 220px; margin: 0 0 24px; }
  .card { padding: 24px; }

  .steps { grid-template-columns: 1fr; gap: 32px; }
  .steps li:not(:last-child)::after { top: 42px; bottom: -32px; left: 20px; right: auto; width: 2px; height: auto; }
  .steps li:first-child::after { background: linear-gradient(180deg, var(--accent), color-mix(in srgb, var(--accent) 50%, var(--green))); }
  .steps li:nth-child(2)::after { background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 50%, var(--green)), var(--green)); }
  .steps li { padding-left: 64px; min-height: 42px; }
  .steps li::before { position: absolute; left: 0; top: 0; margin: 0; }
}