/* System Sciences — hand-rolled static site, no framework, no JavaScript */

:root {
  --ink: #131a29;
  --ink-soft: #45536e;
  --ink-faint: #707d96;
  --paper: #ffffff;
  --paper-tint: #f4f6fa;
  --line: #dfe5ef;
  --navy: #0e1b30;
  --navy-2: #16283f;
  --accent: #2563eb;
  --accent-ink: #1d4fd7;
  --accent-soft: #e6edfd;
  --glow: #5b9bff;
  --amber: #f59e0b;
  --radius: 16px;
  --maxw: 68rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  font-size: 1.0625rem;
  -webkit-font-smoothing: antialiased;
}

/* ---------- layout ---------- */

.container {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

main { min-height: 60vh; }

section { padding-block: 3.5rem; }

.grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 48rem) {
  .grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 0.8rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
}

.logo svg { display: block; }

.logo-name {
  font-weight: 800;
  letter-spacing: 0.14em;
  font-size: 0.95rem;
  text-transform: uppercase;
}

.logo-name small {
  display: block;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--ink-faint);
  font-size: 0.72rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.4rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding-block: 0.25rem;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover { color: var(--ink); }

.site-nav a[aria-current="page"] {
  color: var(--accent-ink);
  border-bottom-color: var(--accent);
}

/* ---------- hero ---------- */

.hero {
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(37, 99, 235, 0.35), transparent 60%),
    radial-gradient(800px 400px at -10% 110%, rgba(245, 158, 11, 0.12), transparent 55%),
    linear-gradient(165deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #eef3fb;
  padding-block: 5rem;
}

.hero .eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: 999px;
  padding: 0.25rem 0.8rem;
  margin-bottom: 1.2rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.3rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  max-width: 22ch;
  color: #ffffff;
}

.hero p.lede {
  font-size: 1.2rem;
  color: #b9c7dd;
  max-width: 56ch;
  margin: 0 0 2rem;
}

.hero-figure {
  background: rgba(9, 16, 29, 0.65);
  border: 1px solid rgba(91, 155, 255, 0.25);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 0.4rem;
  box-shadow: 0 20px 50px rgba(2, 8, 20, 0.55);
}

.hero-figure figcaption {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: #8fa3c2;
  padding-block: 0.5rem 0.4rem;
  border-top: 1px dashed rgba(143, 163, 194, 0.35);
  margin-top: 0.4rem;
}

.hero .btn-primary {
  background: var(--accent);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
}

.hero .btn-primary:hover { background: var(--accent-ink); }

.hero .btn-ghost {
  color: #eef3fb;
  border-color: rgba(238, 243, 251, 0.4);
}

.hero .btn-ghost:hover { background: rgba(238, 243, 251, 0.1); }

@media (min-width: 56rem) {
  .hero .container {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3rem;
    align-items: center;
  }
}

/* ---------- typography ---------- */

h2 {
  font-size: 1.7rem;
  letter-spacing: -0.015em;
  margin: 0 0 0.5rem;
}

h3 { font-size: 1.15rem; margin: 0 0 0.4rem; }

.section-lede {
  color: var(--ink-soft);
  max-width: 62ch;
  margin-top: 0.3rem;
}

.kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin: 0 0 0.6rem;
}

a { color: var(--accent-ink); }

/* ---------- cards ---------- */

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.3rem;
}

.card h3 { display: flex; align-items: center; gap: 0.55rem; }

.card .icon {
  flex: none;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 9px;
  display: inline-grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.card p { margin: 0.2rem 0 0; color: var(--ink-soft); font-size: 0.98rem; }

.card.tint { background: var(--paper-tint); }

/* ---------- lists ---------- */

.checklist {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.55rem;
}

.checklist li {
  padding-left: 1.7rem;
  position: relative;
  color: var(--ink-soft);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 2px;
  background: var(--accent);
  transform: rotate(45deg);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 1.4rem 0 0;
}

.tags li {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  background: var(--paper-tint);
  border-radius: 999px;
  padding: 0.28rem 0.85rem;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  font-weight: 700;
  text-decoration: none;
  border-radius: 10px;
  padding: 0.7rem 1.4rem;
  transition: background 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: var(--accent-ink); }

.btn-ghost {
  color: var(--accent-ink);
  border: 1.5px solid var(--accent);
  margin-left: 0.6rem;
}

.btn-ghost:hover { background: var(--accent-soft); }

/* ---------- alternating sections ---------- */

.tint-band { background: var(--paper-tint); border-block: 1px solid var(--line); }

.pull {
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--ink);
  max-width: 58ch;
  border-left: 4px solid var(--accent);
  padding-left: 1.2rem;
  margin: 1.5rem 0;
}

/* ---------- stats strip ---------- */

.stats {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  margin-top: 2rem;
}

.stat {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  background: var(--paper);
}

.stat strong {
  display: block;
  font-size: 1.6rem;
  color: var(--accent-ink);
  letter-spacing: -0.01em;
}

.stat span { font-size: 0.9rem; color: var(--ink-faint); }

/* ---------- contact ---------- */

.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem;
  background: var(--paper);
}

.contact-card dl { margin: 0; }

.contact-card dt {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 1.1rem;
}

.contact-card dt:first-child { margin-top: 0; }

.contact-card dd { margin: 0.15rem 0 0; }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-tint);
  padding-block: 2.2rem;
  margin-top: 3rem;
  font-size: 0.92rem;
  color: var(--ink-faint);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  justify-content: space-between;
  align-items: baseline;
}

.site-footer nav { display: flex; gap: 1.2rem; }

.site-footer a { color: var(--ink-soft); text-decoration: none; }

.site-footer a:hover { color: var(--ink); text-decoration: underline; }

/* ---------- legal pages ---------- */

.legal h2 { margin-top: 2rem; }
.legal h2:first-of-type { margin-top: 0; }
.legal p { color: var(--ink-soft); max-width: 72ch; }