:root {
  color-scheme: light;
  --ink: #142336;
  --muted: #5c6f82;
  --line: #dce6ec;
  --paper: rgba(255, 255, 255, 0.82);
  --blue: #087ea4;
  --lime: #b8e85d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  font-family: "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
  background:
    radial-gradient(circle at 8% 5%, rgba(184, 232, 93, 0.42), transparent 28rem),
    radial-gradient(circle at 90% 16%, rgba(38, 178, 211, 0.24), transparent 34rem),
    #f3f8f8;
}

main {
  width: min(880px, calc(100% - 32px));
  margin: 48px auto;
  padding: clamp(24px, 5vw, 56px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 30px;
  background: var(--paper);
  box-shadow: 0 24px 80px rgba(35, 74, 92, 0.14);
  backdrop-filter: blur(18px);
}

nav { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 32px; }
nav a, a { color: var(--blue); font-weight: 700; }
h1 { margin: 0 0 8px; font-size: clamp(2rem, 7vw, 4.4rem); letter-spacing: -0.05em; }
h2 { margin-top: 38px; padding-top: 20px; border-top: 1px solid var(--line); }
.eyebrow { color: var(--blue); font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.lead { max-width: 64ch; color: var(--muted); font-size: 1.08rem; }
.notice { padding: 16px 18px; border-left: 5px solid var(--lime); border-radius: 12px; background: #f7ffe7; }
footer { margin-top: 48px; color: var(--muted); font-size: 0.9rem; }
code { overflow-wrap: anywhere; }

@media (max-width: 560px) {
  main { margin: 16px auto; border-radius: 22px; }
  h1 { font-size: 2.5rem; }
}