:root { --teal: #00CCCC; --navy: #002454; }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: #fff;
  color: var(--navy);
  font-family: system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  line-height: 1.6;
}
.top {
  border-bottom: 4px solid var(--teal);
  padding: 16px;
  text-align: center;
}
.wordmark { height: 32px; width: auto; display: block; margin: 0 auto 8px; }
h1 { font-size: 1.25rem; margin: 0; }
main { max-width: 720px; margin: 0 auto; padding: 16px; }
.intro { margin: 0 0 20px; font-size: 1.05rem; }
.list { list-style: none; margin: 0; padding: 0; }
.card {
  border: 2px solid var(--teal);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 20px;
}
h2 { font-size: 1.1rem; margin: 0 0 4px; }
.note { margin: 0 0 10px; }
video { width: 100%; max-width: 100%; display: block; border-radius: 8px; background: var(--navy); }
.error { margin: 0; padding: 12px; background: var(--navy); color: #fff; border-radius: 8px; }
.error a { color: var(--teal); font-weight: 700; }
.msg { margin: 0; }