:root {
  color-scheme: dark;
  --navy: #061536;
  --blue: #0a2460;
  --purple: #5e3bb2;
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.76);
  --line: rgba(176, 202, 255, 0.28);
}

* { box-sizing: border-box; }

html { background: var(--navy); }

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 88% 8%, rgba(130, 78, 218, 0.28), transparent 27rem),
    radial-gradient(circle at 4% 78%, rgba(32, 102, 230, 0.25), transparent 28rem),
    linear-gradient(155deg, #05112c 0%, #081d50 52%, #181352 100%);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
}

a { color: inherit; }

.site-shell { width: min(100% - 32px, 760px); margin: 0 auto; }

header { padding: 56px 0 32px; }

.brand { margin: 0; font-size: clamp(2rem, 10vw, 3.35rem); letter-spacing: -0.05em; line-height: 1.1; }
.tagline { margin: 10px 0 0; color: rgba(255,255,255,.84); font-size: 1.05rem; }
.intro { margin: 24px 0 0; max-width: 38rem; color: var(--muted); }

nav { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
nav a, .link-card {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(12, 32, 78, 0.66);
}
nav a { padding: 8px 14px; font-size: .9rem; }
nav a:hover, .link-card:hover { border-color: rgba(198, 220, 255, .66); }

main { padding-bottom: 42px; }
.card {
  margin: 16px 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: linear-gradient(145deg, rgba(15, 38, 88, .86), rgba(21, 21, 69, .76));
  box-shadow: 0 16px 40px rgba(0, 0, 0, .18);
}
.card h2 { margin: 0 0 12px; font-size: 1.3rem; letter-spacing: -.02em; }
.card h3 { margin: 26px 0 8px; font-size: 1.03rem; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }
.muted { color: var(--muted); }
ul { padding-left: 1.25rem; margin: 10px 0; }
li + li { margin-top: 4px; }

.faq dt { margin-top: 22px; font-weight: 700; }
.faq dd { margin: 8px 0 0; color: var(--muted); }

.contact-mail { display: inline-block; margin-top: 4px; color: #c9dbff; font-weight: 700; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.link-grid { display: grid; gap: 12px; }
.link-card { display: block; padding: 17px 18px; background: linear-gradient(120deg, rgba(31, 87, 193, .78), rgba(100, 54, 171, .72)); font-weight: 700; }

footer { border-top: 1px solid rgba(183, 207, 255, .18); padding: 28px 0 38px; color: var(--muted); font-size: .9rem; }
footer p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 10px; }

@media (min-width: 700px) {
  header { padding-top: 76px; }
  .card { padding: 30px; }
}