:root {
  color-scheme: light dark;
  --violet: #8b7cf6;
  --pink: #f6b8c8;
  --ink: #443b68;
  --cream: #fff8f2;
  --card: rgba(255, 255, 255, 0.82);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top right, #fce1e8 0, transparent 32rem), var(--cream);
  line-height: 1.65;
}
main { width: min(760px, calc(100% - 32px)); margin: 0 auto; padding: 56px 0 80px; }
header { text-align: center; margin-bottom: 38px; }
.logo { width: min(360px, 80%); height: auto; }
h1, h2 { line-height: 1.2; }
h1 { font-size: clamp(2.2rem, 7vw, 4rem); margin: 18px 0 4px; }
h2 { margin-top: 2rem; }
.tagline { font-size: 1.2rem; margin: 0; }
.card {
  background: var(--card);
  border: 1px solid rgba(68, 59, 104, 0.1);
  border-radius: 28px;
  padding: clamp(22px, 5vw, 38px);
  box-shadow: 0 22px 60px rgba(68, 59, 104, 0.08);
}
a { color: #6755e7; font-weight: 700; }
nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 18px; margin-top: 30px; }
.notice { padding: 14px 18px; border-radius: 16px; background: rgba(139, 124, 246, 0.11); }
footer { text-align: center; font-size: .9rem; opacity: .8; margin-top: 36px; }
@media (prefers-color-scheme: dark) {
  :root { --ink: #f4efff; --cream: #171421; --card: rgba(39, 33, 57, .92); }
  body { background: radial-gradient(circle at top right, #452e49 0, transparent 30rem), var(--cream); }
  a { color: #bdb3ff; }
}