body{font-family:system-ui,Arial,Helvetica,sans-serif;margin:0;padding:1rem;background:#f7fafc;color:#222}
header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}
nav a{margin-right:0.5rem}
.card{background:#fff;border:1px solid #e2e8f0;padding:1rem;border-radius:8px;margin-bottom:0.75rem}
.error{color:#b91c1c}
.video-wrap iframe{max-width:100%;}