:root {
  color-scheme: dark;
  --bg: #050b14;
  --panel: rgba(10, 24, 40, .82);
  --panel-soft: rgba(14, 31, 50, .62);
  --line: rgba(80, 220, 255, .22);
  --line-strong: rgba(80, 220, 255, .45);
  --text: #eafaff;
  --muted: #9cb2c1;
  --cyan: #51dcff;
  --green: #50efaa;
  --violet: #aab8ff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 14% 2%, rgba(49, 215, 255, .18), transparent 31rem),
    radial-gradient(circle at 88% 16%, rgba(56, 242, 160, .12), transparent 28rem),
    linear-gradient(180deg, #06111f 0%, var(--bg) 56%, #03070d 100%);
  font: 16px/1.7 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: var(--cyan); text-underline-offset: 3px; }
a:hover { color: var(--green); }

.shell { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  background: rgba(5, 11, 20, .84);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--text);
  font-weight: 900;
  letter-spacing: -.025em;
  text-decoration: none;
}

.brand img { width: 34px; height: 34px; }

.nav-links { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 8px 20px; }
.nav-links a { color: #c4d3dc; font-size: .9rem; font-weight: 700; text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--green); }

.hero { padding: 96px 0 58px; }
.eyebrow { margin: 0 0 16px; color: var(--green); font: 700 .78rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .18em; text-transform: uppercase; }
h1, h2, h3 { margin: 0; line-height: 1.12; letter-spacing: -.035em; }
h1 { max-width: 930px; font-size: clamp(2.55rem, 7vw, 5.6rem); }
h2 { font-size: clamp(1.8rem, 4vw, 3.15rem); }
h3 { font-size: 1.22rem; }
.lead { max-width: 780px; margin: 24px 0 0; color: #c1d2dc; font-size: clamp(1.05rem, 2vw, 1.3rem); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: rgba(49, 215, 255, .09);
  color: var(--text);
  font-weight: 850;
  text-decoration: none;
}
.button.primary { border-color: transparent; background: var(--green); color: #042015; }
.button:hover { transform: translateY(-1px); color: var(--text); }
.button.primary:hover { background: var(--cyan); color: #04151b; }

.notice {
  margin-top: 38px;
  padding: 20px 22px;
  border: 1px solid rgba(80, 239, 170, .28);
  border-radius: 18px;
  background: rgba(80, 239, 170, .07);
  color: #ccecdf;
}
.notice strong { color: var(--green); }

.section { padding: 58px 0; }
.section + .section { border-top: 1px solid rgba(255, 255, 255, .07); }
.section-intro { max-width: 780px; margin: 18px 0 0; color: var(--muted); }

.grid { display: grid; gap: 18px; margin-top: 30px; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card {
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(145deg, var(--panel), var(--panel-soft));
  box-shadow: 0 20px 70px rgba(0, 0, 0, .16);
}
.card p { margin: 13px 0 0; color: var(--muted); }
.card ul { margin-bottom: 0; padding-left: 20px; color: var(--muted); }

.prose { max-width: 820px; }
.prose p, .prose li { color: #b9cbd6; }
.prose h2 { margin-top: 58px; }
.prose h3 { margin-top: 32px; }
.prose code { padding: 2px 7px; border: 1px solid var(--line); border-radius: 7px; color: var(--green); background: #071727; }

.steps { counter-reset: step; display: grid; gap: 18px; margin-top: 28px; }
.step { position: relative; padding: 22px 22px 22px 70px; border-left: 2px solid var(--line-strong); background: rgba(255, 255, 255, .025); }
.step::before { counter-increment: step; content: counter(step); position: absolute; left: 20px; top: 20px; width: 31px; height: 31px; display: grid; place-items: center; border-radius: 9px; background: rgba(49, 215, 255, .16); color: var(--cyan); font-weight: 900; }
.step p { margin: 8px 0 0; color: var(--muted); }

details { padding: 20px 22px; border: 1px solid var(--line); border-radius: 16px; background: rgba(9, 23, 39, .7); }
details + details { margin-top: 12px; }
summary { cursor: pointer; font-weight: 850; }
details p { margin: 12px 0 0; color: var(--muted); }

.related { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.related a { padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; color: #cde6ef; font-size: .9rem; text-decoration: none; }

.site-footer { margin-top: 50px; padding: 36px 0 48px; border-top: 1px solid rgba(255, 255, 255, .08); color: #8299a9; }
.footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px 40px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.footer-links a { color: #a9c0cc; text-decoration: none; }
.small { font-size: .88rem; }

@media (max-width: 820px) {
  .nav { align-items: flex-start; padding: 16px 0; }
  .nav-links { max-width: 62%; }
  .grid.two, .grid.three { grid-template-columns: 1fr; }
  .hero { padding-top: 68px; }
}

@media (max-width: 560px) {
  .nav { display: block; }
  .nav-links { max-width: none; margin-top: 13px; justify-content: flex-start; }
  .shell { width: min(100% - 26px, 1120px); }
  .card { padding: 21px; }
}