* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #f4f6f8;
  color: #2b2b2b;
}

header {
  background: #45c4c6;
  color: #fff;
  padding: 18px 24px;
  font-size: 20px;
  font-weight: 600;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
}

.frame-card {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

iframe { display: block; }

footer {
  text-align: center;
  padding: 16px;
  color: #888;
  font-size: 13px;
}