:root {
  --night: #0d1730;
  --ink: #182033;
  --muted: #5c6473;
  --base: #f8f7f4;
  --paper: #f1e9df;
  --surface: #fff;
  --cobalt: #175cff;
  --aqua: #29c6d1;
  --coral: #ff7154;
  --line: rgb(24 32 51 / 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--base);
  color: var(--ink);
  font-family: "Instrument Sans", system-ui, sans-serif;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
h1, h2, h3 { font-family: Archivo, system-ui, sans-serif; line-height: 1.02; margin: 0; }
h1 { font-size: clamp(2.6rem, 7vw, 5.6rem); }
h2 { font-size: clamp(1.9rem, 4vw, 3rem); }
h3 { font-size: 1.35rem; }
p { margin: 0; color: var(--muted); }

.skip {
  position: absolute;
  left: -999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 20;
  background: var(--night);
  color: white;
  padding: .75rem 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .9rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  background: rgb(248 247 244 / .88);
  backdrop-filter: blur(18px);
}
.brand, .actions, .nav { display: flex; align-items: center; gap: .8rem; }
.brand img { width: 36px; }
.brand span { display: grid; line-height: 1.1; }
.brand small { color: var(--muted); font-size: .72rem; }
.nav { gap: .25rem; }
.nav a, .actions > a:first-child {
  border-radius: 999px;
  padding: .55rem .8rem;
  color: var(--muted);
  font-weight: 600;
  font-size: .92rem;
}
.nav a.active, .nav a:hover { color: var(--ink); background: white; }
.menu-toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: .4rem;
  background: transparent;
}
.menu-toggle span {
  display: block;
  width: 1rem;
  height: 2px;
  background: var(--ink);
  transition: transform .2s ease;
}
.menu-toggle span + span { margin-top: .28rem; }
.menu-toggle.open span:first-child { transform: translateY(.19rem) rotate(45deg); }
.menu-toggle.open span:last-child { transform: translateY(-.19rem) rotate(-45deg); }
.mobile-menu {
  position: fixed;
  inset: 4rem 0 0;
  z-index: 9;
  overflow-y: auto;
  border-top: 1px solid var(--line);
  background: var(--base);
  padding: .5rem 1.25rem 2rem;
}
.mobile-menu nav { display: grid; }
.mobile-menu a:not(.button) {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
  font: 600 1.7rem Archivo, sans-serif;
  color: var(--muted);
}
.mobile-menu a.active { color: var(--night); }
.mobile-menu .button { width: 100%; margin-top: 2rem; }
.mobile-menu .language { font-size: 1rem !important; border-bottom: 0 !important; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.8rem;
  border: 1px solid var(--night);
  border-radius: .45rem;
  background: var(--night);
  color: white;
  padding: .75rem 1rem;
  font-weight: 700;
}
.button.small { min-height: 2.35rem; padding: .55rem .8rem; font-size: .88rem; }
.button.ghost { background: transparent; color: var(--night); }
.button.light { background: white; border-color: white; color: var(--night); }

.hero, .page-hero, .section, .cta, .footer {
  padding: clamp(4rem, 8vw, 7rem) clamp(1rem, 5vw, 4rem);
}
.hero {
  min-height: 78vh;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, .65fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
  background:
    radial-gradient(ellipse at 12% 10%, rgb(23 92 255 / .16), transparent 36%),
    radial-gradient(ellipse at 88% 20%, rgb(255 113 84 / .13), transparent 34%);
}
.hero p { max-width: 42rem; font-size: 1.12rem; margin-top: 1.4rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.hero-panel {
  display: grid;
  gap: 1rem;
  padding: 1.1rem;
  border: 1px solid var(--line);
  background: rgb(255 255 255 / .56);
}
.hero-panel span {
  min-height: 7rem;
  display: grid;
  place-items: center;
  border-radius: .5rem;
  background: var(--night);
  color: white;
  font: 800 clamp(2rem, 5vw, 4rem) Archivo, sans-serif;
}
.hero-panel span:nth-child(2) { background: var(--cobalt); }
.hero-panel span:nth-child(3) { background: var(--coral); }

.eyebrow {
  color: var(--cobalt);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  font-weight: 800;
  margin-bottom: .8rem;
}
.page-hero { max-width: 980px; }
.page-hero p:last-child { max-width: 48rem; margin-top: 1.2rem; font-size: 1.15rem; }
.page-hero span, .split h2 span { color: rgb(24 32 51 / .68); }
.section { max-width: 1280px; margin: 0 auto; }
.paper { max-width: none; background: var(--paper); }
.paper > * { max-width: 1280px; margin-left: auto; margin-right: auto; }
.section-heading { max-width: 780px; margin-bottom: 2rem; }
.section-heading p:last-child { margin-top: .9rem; font-size: 1.08rem; }
.lead { font-size: clamp(1.08rem, 1.7vw, 1.35rem); }

.split {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.cards { display: grid; gap: 1rem; }
.cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cards.two, .contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card, .mini {
  border: 1px solid var(--line);
  border-radius: .5rem;
  background: var(--surface);
  padding: 1.25rem;
}
.card p, .mini p { margin-top: .65rem; }
.card ul { padding-left: 1.1rem; margin: 1rem 0 0; color: var(--muted); }
.row-card { display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; }
.row-card > span, .mini span, .pill {
  color: var(--cobalt);
  font-weight: 800;
}
.stack { display: grid; gap: 1rem; }
.tags { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.tags span, .pill {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .35rem .6rem;
  font-size: .86rem;
}
.equation { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.6rem; font-weight: 800; }
.equation span { border: 1px solid var(--line); background: white; padding: .6rem .8rem; border-radius: .45rem; }
.center { text-align: center; margin-top: 2rem; }
.timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; }
.timeline article { border-top: 2px solid var(--cobalt); padding-top: 1rem; }

.cta {
  background: var(--night);
  color: white;
  text-align: center;
}
.cta p { color: rgb(255 255 255 / .74); max-width: 46rem; margin: 1rem auto 0; }
.cta .eyebrow { color: var(--aqua); }
.cta .button { margin-top: 1.7rem; }

.contact-grid { display: grid; gap: 1rem; align-items: start; }
.form { display: grid; gap: .9rem; }
label { display: grid; gap: .35rem; color: var(--ink); font-weight: 700; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: .45rem;
  padding: .85rem;
  font: inherit;
  background: var(--base);
}
label span { color: var(--muted); font-weight: 500; font-size: .82rem; }
.honeypot { display: none; }
.notice { padding: .8rem; border-radius: .45rem; }
.success { background: rgb(41 198 209 / .15); }
.error { background: rgb(255 113 84 / .16); }

.footer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  border-top: 1px solid var(--line);
}
.footer-grid { display: grid; gap: .6rem; font-weight: 700; }
.copyright { grid-column: 1 / -1; font-size: .9rem; }

@media (max-width: 900px) {
  .site-header { min-height: 4rem; }
  .nav, .actions .button.small { display: none; }
  .actions { margin-left: auto; }
  .menu-toggle { display: grid; }
  .hero, .split, .cards.three, .cards.two, .contact-grid, .footer { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }
}