:root {
  color-scheme: dark;
  --bg: #07111f;
  --bg-soft: #0d1b2f;
  --panel: #111f35;
  --panel-border: rgba(149, 183, 222, 0.22);
  --text: #eef5ff;
  --muted: #a9bad0;
  --accent: #66b5ff;
  --accent-strong: #9bd0ff;
  --warning: #ffd28a;
  --max-width: 1120px;
  --content-card-width: 900px;
  --page-padding: clamp(1rem, 4vw, 2rem);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(102, 181, 255, 0.2), transparent 34rem),
    linear-gradient(135deg, #06101d 0%, #07111f 48%, #0c1424 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent-strong);
  text-decoration: none;
}

a:hover,
a:focus {
  text-decoration: underline;
}

.site-header,
.site-footer,
main {
  width: min(var(--max-width), calc(100% - (var(--page-padding) * 2)));
  margin-inline: auto;
  padding-inline: 0;
}

.site-header {
  padding-block: 2rem 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 2.5rem;
  height: 2.5rem;
  place-items: center;
  border: 1px solid rgba(155, 208, 255, 0.45);
  border-radius: 0.85rem;
  background: linear-gradient(145deg, rgba(102, 181, 255, 0.28), rgba(102, 181, 255, 0.06));
  color: var(--accent-strong);
  font-weight: 900;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1rem;
  margin-top: 1rem;
  color: var(--muted);
}

.hero,
.content-card {
  width: 100%;
  margin: 1.5rem auto;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  border: 1px solid var(--panel-border);
  border-radius: 1.5rem;
  background: rgba(17, 31, 53, 0.82);
  box-shadow: 0 1.5rem 4rem rgba(0, 0, 0, 0.22);
}

main.content-card {
  width: min(var(--content-card-width), calc(100% - (var(--page-padding) * 2)));
}

.hero {
  text-align: center;
}

.hero .lead {
  margin-inline: auto;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: var(--accent-strong);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.2;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 8vw, 4rem);
  letter-spacing: -0.045em;
}

h2 {
  margin-top: 2rem;
  font-size: clamp(1.35rem, 4vw, 2rem);
}

h3 {
  margin-top: 1.5rem;
}

p,
li {
  color: var(--muted);
}

.lead {
  max-width: 44rem;
  color: #d7e7fa;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

main.content-card p,
main.content-card li {
  max-width: 72ch;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 1rem;
  width: 100%;
  margin: 1.5rem auto 0;
  justify-content: center;
}

.tile {
  display: block;
  min-height: 11rem;
  padding: 1.25rem;
  border: 1px solid var(--panel-border);
  border-radius: 1rem;
  background: rgba(7, 17, 31, 0.62);
  text-decoration: none;
}

.tile strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text);
  font-size: 1.1rem;
}

.tile span {
  color: var(--muted);
}

.notice {
  padding: 1rem;
  border: 1px solid rgba(255, 210, 138, 0.35);
  border-radius: 1rem;
  background: rgba(255, 210, 138, 0.08);
  color: var(--warning);
}

.site-footer {
  padding-block: 2rem 3rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  margin-bottom: 0.75rem;
}

code {
  color: #d9ecff;
}

@media (max-width: 640px) {
  :root {
    --page-padding: 0.75rem;
  }

  .hero,
  .content-card {
    border-radius: 1rem;
  }
}