body{margin:0;font-family:Arial,sans-serif;background:#f5f7fb;color:#333}
.hero{background:linear-gradient(135deg,#2b6cb0,#63b3ed);color:white;padding:70px 20px;text-align:center}
nav{display:flex;justify-content:center;gap:30px;background:white;padding:15px;position:sticky;top:0;box-shadow:0 2px 8px rgba(0,0,0,.08)}
nav a{text-decoration:none;color:#2b6cb0;font-weight:bold}
.card{max-width:900px;margin:30px auto;background:white;padding:30px;border-radius:14px;box-shadow:0 4px 10px rgba(0,0,0,.08)}
.video{position:relative;padding-top:56.25%}
.video iframe{position:absolute;left:0;top:0;width:100%;height:100%;border:none}
.placeholder{height:120px;border:2px dashed #8bb7e8;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#666;margin:15px 0}
footer{text-align:center;padding:40px;color:#666}