:root { --navy: #0f2a4a; --blue: #1175bb; --sky: #27aae1; --muted: #5b7593; --line: rgba(15, 42, 74, 0.12); }
* { box-sizing: border-box; margin: 0; }
body {
  background: linear-gradient(180deg, #ffffff 0%, #eaf3fb 100%) fixed;
  color: var(--navy); font-family: "Plus Jakarta Sans", system-ui, sans-serif; -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}
header { display: flex; align-items: center; padding: 20px clamp(16px, 4vw, 48px); }
.mark { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--blue); text-decoration: none; }
.mark img { width: 34px; height: 34px; border-radius: 50%; }
main { max-width: 680px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { font-size: clamp(2rem, 6vw, 2.75rem); font-weight: 800; letter-spacing: -0.03em; }
.updated { margin-top: 8px; font-size: 0.85rem; color: var(--muted); }
h2 { margin-top: 32px; font-size: 1.05rem; font-weight: 700; }
p, li { margin-top: 10px; font-size: 1rem; line-height: 1.65; color: var(--muted); }
ul { padding-left: 20px; }
a { color: var(--blue); }
footer { max-width: 680px; margin: 0 auto; padding: 20px 16px 40px; border-top: 1px solid var(--line); font-size: 0.85rem; color: var(--muted); }
footer a { margin-right: 18px; text-decoration: none; }