:root {
  --bg: #08111f;
  --surface: #101d31;
  --surface-2: #162640;
  --text: #f5f8ff;
  --muted: #b7c3d8;
  --accent: #67e8f9;
  --accent-strong: #22d3ee;
  --line: #2a3d5e;
  --success: #86efac;
  --warning: #fde68a;
  --shadow: 0 18px 50px rgba(0, 0, 0, .28);
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 10% 0%, rgba(34, 211, 238, .13), transparent 34rem),
    radial-gradient(circle at 100% 15%, rgba(99, 102, 241, .14), transparent 32rem),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a { color: var(--accent); text-underline-offset: .2em; }
a:hover { color: #a5f3fc; }
a:focus-visible, button:focus-visible {
  outline: 3px solid var(--warning);
  outline-offset: 3px;
  border-radius: .25rem;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 100;
  background: var(--warning);
  color: #111827;
  padding: .7rem 1rem;
  border-radius: .5rem;
  font-weight: 800;
}
.skip-link:focus { top: 1rem; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(8, 17, 31, .84);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.nav {
  width: min(1120px, calc(100% - 2rem));
  min-height: 4.5rem;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 900;
  letter-spacing: -.02em;
}
.brand span { color: var(--accent); }
.nav-links { display: flex; flex-wrap: wrap; gap: .35rem; }
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  padding: .45rem .7rem;
  border-radius: .55rem;
  font-weight: 700;
}
.nav-links a:hover, .nav-links a[aria-current="page"] {
  color: var(--text);
  background: var(--surface-2);
}

main, .site-footer {
  width: min(960px, calc(100% - 2rem));
  margin-inline: auto;
}
main { padding: 4rem 0 5rem; }

.hero {
  padding: 3rem 0 2rem;
  max-width: 780px;
}
.eyebrow {
  color: var(--accent);
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .13em;
  text-transform: uppercase;
  margin: 0 0 .7rem;
}
h1, h2, h3 {
  line-height: 1.18;
  letter-spacing: -.025em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.45rem, 7vw, 4.6rem); margin: 0 0 1rem; }
h2 { font-size: clamp(1.55rem, 4vw, 2.25rem); margin: 0 0 1rem; }
h3 { font-size: 1.15rem; margin: 0 0 .55rem; }
.lede {
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  max-width: 70ch;
  margin: 0;
}
.meta { color: var(--muted); font-size: .95rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}
.card, .panel {
  background: linear-gradient(145deg, rgba(22, 38, 64, .96), rgba(16, 29, 49, .96));
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow);
}
.card {
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
}
.card p { color: var(--muted); margin: 0 0 1.2rem; flex: 1; }
.card a.action {
  display: inline-flex;
  align-self: flex-start;
  color: #06202a;
  background: var(--accent);
  padding: .62rem .9rem;
  border-radius: .62rem;
  font-weight: 900;
  text-decoration: none;
}
.card a.action:hover { background: #a5f3fc; color: #06202a; }

.panel { padding: clamp(1.2rem, 4vw, 2rem); margin: 1.2rem 0; }
.panel > :first-child { margin-top: 0; }
.panel > :last-child { margin-bottom: 0; }
.notice {
  border-left: 4px solid var(--accent-strong);
  background: rgba(34, 211, 238, .08);
  padding: 1rem 1.1rem;
  border-radius: 0 .75rem .75rem 0;
}
.warning { border-left-color: var(--warning); background: rgba(253, 230, 138, .08); }

.button-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.5rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: .7rem;
  padding: .75rem 1rem;
  font-weight: 900;
  text-decoration: none;
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--surface-2);
}
.button.primary { color: #06202a; background: var(--accent); border-color: var(--accent); }
.button:hover { color: var(--text); border-color: var(--accent); }
.button.primary:hover { color: #06202a; background: #a5f3fc; }

.toc {
  columns: 2;
  column-gap: 2rem;
  padding-left: 1.25rem;
}
.toc li { break-inside: avoid; margin: .35rem 0; }
section[id] { scroll-margin-top: 6rem; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: .8rem; }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { text-align: left; vertical-align: top; padding: .9rem; border-bottom: 1px solid var(--line); }
th { color: var(--accent); background: var(--surface-2); }
tr:last-child td { border-bottom: 0; }
td ul { margin: 0; padding-left: 1.1rem; }

.steps { counter-reset: steps; list-style: none; padding: 0; }
.steps > li {
  position: relative;
  padding: 0 0 1.4rem 3rem;
  counter-increment: steps;
}
.steps > li::before {
  content: counter(steps);
  position: absolute;
  left: 0;
  top: .05rem;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent);
  color: #06202a;
  font-weight: 900;
}
code {
  color: var(--warning);
  background: rgba(255, 255, 255, .06);
  padding: .12em .35em;
  border-radius: .3em;
}

.site-footer {
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding: 2rem 0 3rem;
  font-size: .92rem;
}
.site-footer p { margin: .3rem 0; }

@media (max-width: 780px) {
  .grid { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; padding: .8rem 0; flex-direction: column; }
  .toc { columns: 1; }
  main { padding-top: 2rem; }
}