:root {
  color-scheme: light;
  --ink: #302a36;
  --muted: #716878;
  --pink: #ff79ae;
  --pink-soft: #fff0f6;
  --blue: #c9ebff;
  --paper: #fffafd;
  --line: #ecdfe7;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 5%, #ffe0ed 0 8rem, transparent 8.1rem),
    radial-gradient(circle at 92% 20%, #dff3ff 0 10rem, transparent 10.1rem),
    var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  font-size: 17px;
  line-height: 1.8;
}

a { color: #a33a6b; text-underline-offset: .2em; }

.hero, main, footer {
  width: min(720px, calc(100% - 40px));
  margin-inline: auto;
}

.hero { padding: 72px 0 36px; }
.hero.compact { padding-bottom: 18px; }

.mark {
  display: grid;
  place-items: center;
  width: 62px;
  height: 62px;
  margin-bottom: 22px;
  border: 2px solid var(--ink);
  border-radius: 21px;
  background: linear-gradient(135deg, #ffd5e6 0 49%, #c8ebff 50%);
  font: 800 30px/1 Georgia, serif;
  transform: rotate(-3deg);
}

.eyebrow {
  margin: 0 0 8px;
  color: #b54b78;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .18em;
}

h1, h2 { line-height: 1.35; }
h1 { margin: 0; font-family: Georgia, "Yu Mincho", serif; font-size: clamp(34px, 7vw, 54px); }
h2 { margin: 0 0 18px; font-size: 25px; }
.lead { margin: 18px 0 0; color: var(--muted); }
.back { display: inline-block; margin-bottom: 28px; text-decoration: none; }

main { padding-bottom: 56px; }
section { margin: 18px 0 44px; }

details {
  margin: 12px 0;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, .86);
  padding: 0 20px;
  box-shadow: 0 8px 28px rgba(57, 37, 50, .05);
}

summary { cursor: pointer; padding: 18px 0; font-weight: 700; }
details p { margin: 0 0 20px; color: var(--muted); }

.note {
  border-radius: 28px;
  background: linear-gradient(135deg, var(--pink-soft), #eef9ff);
  padding: 30px;
}

.button {
  display: inline-block;
  margin-top: 8px;
  border-radius: 999px;
  background: var(--ink);
  color: white;
  padding: 12px 21px;
  text-decoration: none;
  font-weight: 700;
}

.policy section {
  border-left: 4px solid #ffc1d9;
  padding-left: 22px;
}

.policy p { color: var(--muted); }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--line);
  padding: 28px 0 50px;
  color: var(--muted);
  font-size: 14px;
}

footer p { margin: 0; }
footer nav { display: flex; gap: 18px; }

@media (max-width: 520px) {
  .hero { padding-top: 48px; }
  .note { padding: 24px; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: no-preference) {
  details { transition: transform .18s ease, box-shadow .18s ease; }
  details:hover { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(57, 37, 50, .08); }
}