:root {
  --ink: #0b0d12;
  --muted: #52525b;
  --soft: #71717a;
  --line: #e4e4e7;
  --brand: #2f4cf2;
  --canvas: #f6f7f9;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 15px/1.7 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
}
header {
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.bar {
  max-width: 820px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.brand span { color: #a1a1aa; }
.mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: #000033;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.cta {
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--ink);
  padding: 8px 14px;
  border-radius: 10px;
  text-decoration: none;
}
main {
  max-width: 820px;
  margin: 32px auto 64px;
  padding: 40px 44px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
}
h1 { font-size: 30px; line-height: 1.2; letter-spacing: -0.025em; margin: 0 0 6px; }
.updated { color: var(--soft); font-size: 13px; margin: 0 0 28px; }
h2 { font-size: 18px; letter-spacing: -0.01em; margin: 32px 0 8px; }
p, li { color: var(--muted); }
ul { padding-left: 20px; }
li { margin: 4px 0; }
a { color: var(--brand); text-decoration: none; }
a:hover { opacity: 0.8; }
.box {
  background: var(--canvas);
  border-radius: 12px;
  padding: 16px 18px;
  margin-top: 12px;
}
.box p { margin: 2px 0; }
footer {
  max-width: 820px;
  margin: 0 auto 40px;
  padding: 0 20px;
  font-size: 13px;
  color: var(--soft);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
footer a { color: var(--soft); }
footer a:hover { color: var(--ink); opacity: 1; }
@media (max-width: 640px) {
  main { margin: 16px; padding: 24px 20px; border-radius: 16px; }
  h1 { font-size: 24px; }
}