:root {
  --aqua: #6EC8D0;
  --aqua-dark: #3aa8b3;
  --ink: #1a1d21;
  --muted: #5c6570;
  --line: #e4e7eb;
  --bg: #f4f7f8;
  --card: #ffffff;
  --danger: #c62828;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}
a { color: var(--aqua-dark); }
.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 20px;
}
header.site {
  background: var(--aqua);
  color: #fff;
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
}
.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
}
nav a {
  color: #fff;
  text-decoration: none;
  margin-left: 16px;
  font-size: 0.95rem;
}
nav a:hover { text-decoration: underline; }
.hero {
  background: linear-gradient(180deg, var(--aqua) 0%, #8fd6dc 55%, var(--bg) 100%);
  color: #fff;
  padding: 56px 0 72px;
}
.hero h1 {
  margin: 0 0 12px;
  font-size: 2.4rem;
  line-height: 1.15;
}
.hero p { max-width: 36rem; font-size: 1.1rem; }
.btn {
  display: inline-block;
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  padding: 12px 18px;
  border-radius: 10px;
  margin-right: 10px;
  margin-top: 12px;
}
.btn.ghost {
  background: transparent;
  color: #fff;
  border: 1px solid #fff;
}
main.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 36px 20px 72px;
}
main.page h1 { margin-top: 0; }
.meta { color: var(--muted); margin-top: 0; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 28px 0 8px;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 18px 16px;
}
.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.notice {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--aqua);
  padding: 14px 16px;
  border-radius: 8px;
}
.danger-box {
  background: #fff;
  border: 1px solid #f3c2c2;
  border-left: 4px solid var(--danger);
  padding: 14px 16px;
  border-radius: 8px;
}
.cta-row { margin: 24px 0; }
.mail {
  display: inline-block;
  background: var(--aqua);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 12px 18px;
  border-radius: 10px;
}
footer.site {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 0.9rem;
}
footer.site a { color: var(--muted); margin-right: 14px; }
ol.steps { padding-left: 1.2em; }
ol.steps li { margin: 0.55em 0; }
@media (max-width: 640px) {
  nav a { margin-left: 10px; font-size: 0.85rem; }
  .hero h1 { font-size: 1.85rem; }
}