:root {
  --ink: #18212b;
  --ink2: #263441;
  --paper: #f7f5f1;
  --white: #fff;
  --muted: #66717b;
  --red: #ff2d37;
  --red-dark: #d8202a;
  --soft: #ece9e3;
  --line: rgba(24, 33, 43, .16);
  --display: 'Manrope', 'Inter', system-ui, sans-serif;
  --body: 'Inter', system-ui, sans-serif;
  --mono: 'Space Mono', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.75 var(--body);
  -webkit-font-smoothing: antialiased;
}

.skip { position: absolute; left: -999px; }
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  padding: .75rem 1rem;
  background: var(--ink);
  color: var(--white);
}

.shell { width: min(1120px, calc(100% - 2.5rem)); margin-inline: auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(247, 245, 241, .94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-row {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--ink);
  font: 800 .95rem var(--display);
  letter-spacing: .03em;
  text-decoration: none;
}
.brand img { width: 38px; height: 38px; border-radius: 9px; object-fit: cover; }
.nav-row nav, .footer-links { display: flex; flex-wrap: wrap; gap: 1.2rem; }
.nav-row nav a, .footer-links a {
  color: var(--muted);
  font: 700 .68rem var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  text-decoration: none;
}
.nav-row nav a:hover, .nav-row nav a[aria-current=page], .footer-links a:hover { color: var(--red-dark); }

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(5.5rem, 11vw, 9rem) 0;
  background: var(--ink);
  border-bottom: 1px solid var(--line);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, rgba(11, 18, 25, .92), rgba(11, 18, 25, .75) 54%, rgba(11, 18, 25, .38));
}
.hero-video {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero .shell { position: relative; }
.hero h1 { color: var(--white); text-shadow: 0 2px 30px rgba(0, 0, 0, .28); }
.hero .lede { color: #dce2e6; }
.hero .button.secondary { color: var(--white); border-color: rgba(255, 255, 255, .78); }

.eyebrow {
  margin: 0 0 1rem;
  color: var(--red-dark);
  font: 700 .7rem/1.5 var(--mono);
  letter-spacing: .15em;
  text-transform: uppercase;
}
.hero .eyebrow { color: #ff858b; }
h1, h2, h3 { margin: 0; color: var(--ink); font-family: var(--display); }
h1 { max-width: 17ch; font-size: clamp(3rem, 7vw, 6rem); line-height: 1.02; letter-spacing: -.052em; }
h1 em { color: var(--red); font-style: normal; }
h2 { font-size: clamp(2rem, 4.4vw, 3.7rem); line-height: 1.08; letter-spacing: -.04em; }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); line-height: 1.3; }
.lede { max-width: 750px; margin: 1.7rem 0 0; color: var(--muted); font-size: clamp(1.08rem, 2vw, 1.35rem); }
.hero-actions { display: flex; align-items: center; gap: 1.3rem; flex-wrap: wrap; margin-top: 2.2rem; }
.button {
  display: inline-block;
  padding: .9rem 1.15rem;
  background: var(--red);
  border: 1px solid var(--red);
  color: var(--white);
  font: 700 .72rem var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
  text-decoration: none;
}
.button:hover { background: var(--red-dark); }
.button.secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.text-link { color: var(--red-dark); text-underline-offset: 4px; }

.section { padding: clamp(4rem, 8vw, 7rem) 0; border-bottom: 1px solid var(--line); }
.section-ink { background: var(--ink); color: var(--white); }
.section-ink h2, .section-ink h3 { color: var(--white); }
.section-ink .eyebrow { color: #ff6970; }
.section-ink .prose p, .section-ink .card p { color: #c1c8ce; }
.split {
  display: grid;
  grid-template-columns: minmax(260px, .8fr) minmax(0, 1.2fr);
  gap: clamp(2.5rem, 7vw, 6rem);
  align-items: start;
}
.prose { max-width: 720px; }
.prose p { margin: 0; color: var(--muted); }
.prose p + p { margin-top: 1.2rem; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2.5rem;
  background: var(--line);
  border: 1px solid var(--line);
}
.card { padding: clamp(1.4rem, 3vw, 2.2rem); background: var(--white); }
.section-ink .card { background: var(--ink2); }
.card h3 { margin: .65rem 0; }
.card p { margin: 0; color: var(--muted); }
.number { color: var(--red-dark); font: 700 .68rem var(--mono); letter-spacing: .1em; }
.section-ink .number { color: #ff6970; }

.branch {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, .9fr);
  gap: clamp(2rem, 6vw, 5rem);
  padding: clamp(2rem, 5vw, 4rem);
  background: var(--white);
  border: 1px solid var(--line);
}
.branch p { color: var(--muted); }
.branch-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.branch-item { padding: 1.3rem; background: var(--paper); }
.branch-item strong {
  display: block;
  color: var(--red-dark);
  font: 700 .7rem var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.branch-item span { display: block; margin-top: .4rem; color: var(--muted); }

.page-hero {
  padding: clamp(4.5rem, 9vw, 7rem) 0;
  background: radial-gradient(circle at 88% 15%, rgba(255, 45, 55, .11), transparent 32%);
  border-bottom: 1px solid var(--line);
}
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 5rem); }
.framework { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.framework article { padding: 1.6rem; background: var(--white); }
.framework p { margin: .7rem 0 0; color: var(--muted); }
.boundary { padding: 1.5rem; background: var(--white); border-left: 3px solid var(--red); color: var(--muted); }

.footer { padding: 3rem 0 2rem; background: var(--white); }
.footer-row { display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.footer p { margin: .6rem 0 0; color: var(--muted); font-size: .85rem; }
.legal { margin-top: 2rem; padding-top: 1.3rem; border-top: 1px solid var(--line); color: var(--muted); font: 400 .68rem var(--mono); }
:focus-visible { outline: 2px solid var(--red); outline-offset: 4px; }

@media (max-width: 840px) {
  .nav-row { align-items: flex-start; flex-direction: column; padding: 1rem 0; }
  .split, .branch { grid-template-columns: 1fr; }
  .card-grid, .framework { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .shell { width: min(100% - 1.5rem, 1120px); }
  .nav-row nav { gap: .8rem 1rem; }
  .nav-row nav a { font-size: .64rem; }
  h1 { font-size: 2.8rem; }
  .hero { padding-top: 4.5rem; background: linear-gradient(135deg, var(--ink), #314251); }
  .brand img { width: 34px; height: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-video { display: none; }
}