:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --line: #dbe3ef;
  --accent: #0891b2;
  --accent2: #06b6d4;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(180deg, #f8fbff, var(--bg));
  color: var(--ink);
}

.landing-shell {
  max-width: 860px;
  margin: 0 auto;
  padding: 20px 14px 40px;
  display: grid;
  gap: 12px;
}

.landing-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
}

.landing-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}

.landing-card h1,
.landing-card h2 {
  margin: 0 0 10px;
}

.landing-card p {
  margin: 0 0 10px;
  line-height: 1.55;
  color: var(--muted);
}

.eyebrow {
  color: #0e7490;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.76rem;
}

.btn {
  display: inline-block;
  padding: 9px 13px;
  border-radius: 10px;
  border: 1px solid #99f6e4;
  text-decoration: none;
  color: #0f172a;
  background: #ecfeff;
  font-weight: 700;
}

.btn-primary {
  border: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #022c22;
}

.cta-row {
  margin-top: 12px;
}

details {
  border-top: 1px solid var(--line);
  padding-top: 10px;
  margin-top: 10px;
}

summary {
  font-weight: 700;
  cursor: pointer;
}

.link-list {
  margin: 0;
  padding-left: 18px;
  line-height: 1.6;
}

.link-list a {
  color: #155e75;
  text-decoration: none;
}

@media (max-width: 680px) {
  .landing-card { padding: 14px; }
}