* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.6 Arial, sans-serif;
  color: #26384a;
  background: #f0f8ff;
}
header { background: #154f7c; color: white; padding: 14px 16px; }
nav {
  max-width: 900px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
nav a { color: inherit; text-decoration: none; }
.brand { font-weight: bold; }
.back { padding: 6px 10px; border: 1px solid currentColor; border-radius: 8px; }
main { max-width: 900px; margin: auto; padding: 28px 16px; }
h1 { margin: 0 0 10px; font-size: clamp(28px, 5vw, 42px); line-height: 1.18; color: #164e78; }
.intro { margin: 0 0 24px; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
  gap: 16px;
  padding: 0;
  margin: 0;
  list-style: none;
}
.card {
  display: block;
  overflow: hidden;
  border-radius: 14px;
  background: white;
  color: #164e78;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(20, 60, 90, .1);
}
.card img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; }
.card-copy { padding: 14px 16px; }
.card h2 { font-size: 20px; margin: 4px 0 8px; line-height: 1.35; }
.category { color: #435466; font-size: 14px; }
.play-label { font-weight: bold; text-decoration: underline; }
.watch { max-width: 640px; }
video {
  display: block;
  width: 100%;
  height: auto;
  max-height: 66vh;
  object-fit: contain;
  border-radius: 12px;
  background: #111;
}
.button {
  display: inline-block;
  padding: 12px 16px;
  border-radius: 8px;
  background: #116638;
  color: white;
  font-weight: bold;
  text-decoration: none;
}
a:focus-visible { outline: 3px solid #cb6c00; outline-offset: 3px; }
footer { text-align: center; padding: 16px; color: #435466; font-size: 14px; }