:root {
  color-scheme: dark;
  --bg-top: #05131d;
  --bg-bottom: #102b3c;
  --panel: rgba(7, 21, 31, 0.84);
  --panel-border: rgba(139, 220, 241, 0.16);
  --text: #edf8fb;
  --muted: #a8c0cb;
  --accent: #dffbff;
  --accent-soft: #8bdcf1;
  --warning: #ffd47b;
  --good: #8cf3bb;
  --danger: #ff8b78;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Hiragino Sans", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(139, 220, 241, 0.14), transparent 26%),
    linear-gradient(180deg, var(--bg-bottom), var(--bg-top));
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 42px 42px;
  opacity: 0.16;
  pointer-events: none;
}
main {
  position: relative;
  z-index: 1;
  max-width: 1240px;
  margin: 0 auto;
  padding: 24px;
}
.hero, .section, .nav-box {
  border: 1px solid var(--panel-border);
  border-radius: 28px;
  background: var(--panel);
  backdrop-filter: blur(12px);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}
.hero { padding: 30px; }
.section, .nav-box { padding: 24px; }
.stack { display: grid; gap: 20px; margin-top: 20px; }
.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-soft);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 12px; font-size: clamp(2.2rem, 7vw, 4.1rem); line-height: 0.96; }
h2 { margin-bottom: 14px; font-size: 1.6rem; }
h3 { margin-bottom: 10px; font-size: 1.08rem; color: var(--accent); }
p, li { line-height: 1.8; color: var(--muted); }
ul, ol { margin: 0; padding-left: 22px; }
li + li { margin-top: 8px; }
code {
  padding: 2px 6px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  font-family: "SFMono-Regular", Consolas, monospace;
}
a { color: var(--accent-soft); text-decoration: none; }
a:hover { color: var(--accent); }
.pill {
  display: inline-block;
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(139, 220, 241, 0.12);
  color: var(--accent);
}
.grid {
  display: grid;
  gap: 16px;
}
.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.05);
}
.step-list {
  display: grid;
  gap: 14px;
  padding: 0;
  list-style: none;
}
.step-list li {
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.04);
}
.step-list strong {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 1.04rem;
}
.note { color: var(--warning); }
.good { color: var(--good); }
.danger { color: var(--danger); }
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  overflow: hidden;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.03);
}
th, td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
th {
  color: var(--accent);
  background: rgba(139, 220, 241, 0.08);
  font-weight: 700;
}
tr:last-child td { border-bottom: 0; }
.table-wrap { overflow-x: auto; }
.topnav, .subnav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.topnav a, .subnav a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(139, 220, 241, 0.14);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}
.topnav a.current, .subnav a.current {
  background: rgba(255, 212, 123, 0.14);
  border-color: rgba(255, 212, 123, 0.4);
  color: #fff4d0;
}
.footer-note {
  margin-top: 8px;
  font-size: 0.95rem;
}
@media (max-width: 980px) {
  .grid.two, .grid.three { grid-template-columns: 1fr; }
}