body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f7fb;
  color: #1f2937;
}
.header {
  background: #111827;
  color: white;
  padding: 28px;
}
.container {
  max-width: 960px;
  margin: 40px auto;
  padding: 0 16px;
}
.card {
  background: white;
  border-radius: 14px;
  padding: 28px;
  box-shadow: 0 8px 28px rgba(0,0,0,.08);
}
.small {
  color: #6b7280;
  font-size: 14px;
}