:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #e9f0f2;
  background: #0b1216;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scrollbar-width: none; }
html::-webkit-scrollbar { display: none; }
body { margin: 0; background: #0b1216; }
main { width: min(760px, 100%); margin: 0 auto; padding: 32px 20px 64px; }
header { display: flex; align-items: center; gap: 12px; padding-bottom: 24px; border-bottom: 1px solid #293a42; }
.mark { width: 48px; height: 48px; display: block; object-fit: contain; flex: none; }
header b, header span { display: block; }
header span { color: #8da0a8; font-size: 12px; margin-top: 2px; }
h1 { margin: 34px 0 8px; font-size: 32px; line-height: 1.15; letter-spacing: 0; }
h2 { margin: 28px 0 8px; font-size: 19px; letter-spacing: 0; }
p, li { color: #a8b7bd; font-size: 14px; line-height: 1.65; }
ul { padding-left: 20px; }
.effective { color: #7f929a; font-size: 12px; }
.callout { margin: 22px 0; padding: 16px; border-left: 3px solid #49c58b; background: #101e1d; }
a { color: #bde5d2; }
nav { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; padding-top: 20px; border-top: 1px solid #293a42; }