:root {
  color-scheme: dark;
  --bg: #050a18;
  --surface: #0b1428;
  --line: #1a2a4a;
  --text: #e8eefc;
  --muted: #93a3c4;
  --blue: #2f8cff;
  --cyan: #35c8ff;
  --green: #3ddc84;
  --radius: 18px;
  --max: 1040px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
}

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

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.brand img { width: 30px; height: 30px; border-radius: 8px; }
.site-header nav { display: flex; gap: 22px; font-size: 15px; }
.site-header nav a { color: var(--muted); text-decoration: none; }
.site-header nav a:hover, .site-header nav a[aria-current="page"] { color: var(--text); }

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 72px;
  text-align: center;
  background:
    radial-gradient(60% 50% at 50% 0%, rgba(47, 140, 255, 0.22), transparent 70%),
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 48px 48px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 48px 48px;
  background-blend-mode: normal;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(transparent 40%, var(--bg));
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 1; }
.hero-icon {
  width: 132px;
  height: 132px;
  border-radius: 30px;
  box-shadow: 0 0 0 1px rgba(53, 200, 255, 0.35), 0 20px 60px rgba(47, 140, 255, 0.35);
}
.hero h1 {
  margin: 28px 0 12px;
  font-size: clamp(40px, 7vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.03em;
}
.hero .tagline {
  margin: 0 auto;
  max-width: 560px;
  color: var(--muted);
  font-size: clamp(18px, 2.4vw, 21px);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
}
.badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px var(--green);
}

/* Features */
.features { padding: 24px 0 80px; }
.section-title {
  margin: 0 0 28px;
  text-align: center;
  font-size: clamp(26px, 4vw, 34px);
  letter-spacing: -0.02em;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.card h3 { margin: 14px 0 6px; font-size: 18px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.card svg { width: 28px; height: 28px; stroke: var(--cyan); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* Text pages */
.page { padding: 56px 0 80px; }
.page .wrap { max-width: 720px; }
.page h1 { margin: 0 0 6px; font-size: clamp(32px, 5vw, 42px); letter-spacing: -0.02em; }
.page .updated { margin: 0 0 36px; color: var(--muted); font-size: 15px; }
.page h2 { margin: 36px 0 8px; font-size: 21px; letter-spacing: -0.01em; }
.page p, .page li { color: #c9d4ec; }
.page h3 { margin: 24px 0 4px; font-size: 17px; }
.page h2, .page h3 { scroll-margin-top: 16px; }
.toc {
  margin: 28px 0 8px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  font-size: 15px;
}
.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 28px; }
.toc li { margin: 0; padding: 3px 0; break-inside: avoid; }
.toc a { color: var(--muted); text-decoration: none; }
.toc a:hover { color: var(--text); }
@media (max-width: 520px) { .toc ol { columns: 1; } }

.page ul { padding-left: 22px; }
.page li { margin: 6px 0; }
.callout {
  margin: 24px 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: 12px;
  background: var(--surface);
}
.callout p { margin: 0; color: var(--text); }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--text); }

@media (max-width: 520px) {
  .site-header nav { gap: 16px; }
  .hero { padding: 64px 0 56px; }
  .hero-icon { width: 108px; height: 108px; border-radius: 24px; }
}