:root {
  --bg: #0b1210;
  --bg-elev: #121c18;
  --text: #e8f0eb;
  --muted: #9aafa3;
  --accent: #3d9bff;
  --line: rgba(232, 240, 235, 0.12);
  --max: 42rem;
  --sans: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--ui);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(61, 155, 255, 0.18), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(46, 160, 110, 0.14), transparent 50%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: #7ab8ff;
}

.site-header,
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem;
}

.brand {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-header nav a[aria-current="page"],
.site-header nav a:hover {
  color: var(--text);
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 3rem;
}

.hero {
  max-width: var(--max);
  margin: 4rem auto 2rem;
  padding: 0 1.25rem;
}

.hero h1 {
  font-family: var(--sans);
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  line-height: 1.05;
  margin: 0.25rem 0 0.75rem;
  letter-spacing: -0.02em;
}

.lede {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 34rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0;
}

.cta-row {
  margin-top: 1.75rem;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #061018;
  font-weight: 600;
  text-decoration: none;
  padding: 0.7rem 1.1rem;
  border-radius: 10px;
}

.btn:hover {
  color: #061018;
  filter: brightness(1.06);
}

.btn[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
}

.btn-ghost {
  display: inline-block;
  margin-left: 0.65rem;
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
  padding: 0.7rem 0.35rem;
}

.btn-ghost:hover {
  color: var(--text);
}

.doc {
  max-width: var(--max);
  margin: 2rem auto 0;
  padding: 0 1.25rem 2rem;
}

.doc h1 {
  font-family: var(--sans);
  font-size: clamp(1.9rem, 4vw, 2.4rem);
  margin: 0.2rem 0 0.75rem;
  letter-spacing: -0.02em;
}

.doc h2 {
  font-family: var(--sans);
  font-size: 1.25rem;
  margin: 2.25rem 0 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.doc .meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.doc ul {
  padding-left: 1.2rem;
}

.doc li {
  margin: 0.45rem 0;
}

.toc {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.85rem 1rem;
  margin: 1.5rem 0;
}

.toc ol {
  margin: 0;
  padding-left: 1.2rem;
}

.toc a {
  color: var(--text);
  text-decoration: none;
}

.toc a:hover {
  color: var(--accent);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1rem 0;
}

th,
td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.7rem;
  vertical-align: top;
  text-align: left;
}

th {
  background: var(--bg-elev);
  font-weight: 600;
}

.fine {
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  table,
  thead,
  tbody,
  th,
  td,
  tr {
    display: block;
  }

  thead {
    display: none;
  }

  tr {
    border: 1px solid var(--line);
    border-radius: 10px;
    margin-bottom: 0.75rem;
    padding: 0.35rem 0;
    background: var(--bg-elev);
  }

  td {
    border: none;
    padding: 0.35rem 0.75rem;
  }

  td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
    margin-bottom: 0.15rem;
  }
}