:root {
  color-scheme: dark;
  --background: #080b12;
  --surface: #111827;
  --surface-soft: #171f30;
  --text: #f4f7fb;
  --muted: #aab5c8;
  --accent: #8ba6ff;
  --accent-strong: #c4d0ff;
  --border: rgba(255, 255, 255, 0.11);
  --success: #72ddb0;
}

* { box-sizing: border-box; }

html {
  background: var(--background);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% -10%, rgba(91, 119, 255, 0.22), transparent 34rem),
    radial-gradient(circle at 90% 15%, rgba(64, 220, 169, 0.12), transparent 30rem),
    var(--background);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.68;
}

a { color: var(--accent-strong); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--border);
  background: rgba(8, 11, 18, 0.82);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1080px, calc(100% - 32px));
  min-height: 64px;
  margin: 0 auto;
}

.brand {
  color: var(--text);
  font-size: 17px;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav-links { display: flex; gap: 18px; }
.nav-links a { color: var(--muted); font-size: 14px; text-decoration: none; }
.nav-links a:hover { color: var(--text); }

main {
  width: min(820px, calc(100% - 32px));
  margin: 0 auto;
  padding: 72px 0 96px;
}

.hero { margin-bottom: 42px; }
.eyebrow {
  margin: 0 0 10px;
  color: var(--success);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.18; letter-spacing: -0.025em; }
h1 { max-width: 760px; margin: 0; font-size: clamp(40px, 7vw, 68px); }
h2 { margin: 54px 0 16px; font-size: 27px; }
h3 { margin: 28px 0 8px; font-size: 19px; }
p, li { color: var(--muted); }
.lede { max-width: 690px; margin-top: 20px; font-size: 18px; }
.meta { margin-top: 18px; color: #7f8ba0; font-size: 14px; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.card {
  display: block;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(145deg, rgba(23, 31, 48, 0.96), rgba(17, 24, 39, 0.84));
  color: var(--text);
  text-decoration: none;
}

.card:hover { border-color: rgba(139, 166, 255, 0.55); transform: translateY(-1px); }
.card strong { display: block; margin-bottom: 8px; font-size: 20px; }
.card span { color: var(--muted); }

.notice {
  margin: 26px 0;
  padding: 18px 20px;
  border: 1px solid rgba(139, 166, 255, 0.28);
  border-radius: 14px;
  background: rgba(91, 119, 255, 0.09);
  color: var(--accent-strong);
}

table { width: 100%; border-collapse: collapse; margin: 20px 0; }
th, td { padding: 14px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { color: var(--text); font-size: 14px; }
td { color: var(--muted); }
code { color: #d5ddff; }

footer {
  padding: 32px 16px;
  border-top: 1px solid var(--border);
  color: #7f8ba0;
  text-align: center;
  font-size: 13px;
}

@media (max-width: 640px) {
  main { padding-top: 52px; }
  .card-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; }
  .nav-links a:first-child { display: none; }
  th, td { display: block; padding: 10px 0; }
  th { padding-top: 20px; border-bottom: 0; }
}