body{margin:0;font-family:Arial,sans-serif;background:linear-gradient(135deg,#0f172a,#2563eb);display:flex;flex-direction:column;min-height:100vh;align-items:stretch;color:#fff}.hero{background:rgba(255,255,255,.08);padding:40px;border-radius:18px;text-align:center;max-width:800px;width:calc(100% - 40px);box-sizing:border-box;margin:30px auto;box-shadow:0 10px 30px rgba(0,0,0,.3)}h1{font-size:2.2rem}h2{color:#fde68a}

.module-h-video iframe {
  display: block;
  max-width: 100%;
}
@media (max-width: 700px) {
  .module-h-video iframe {
    width: 100%;
    height: min(177.78vw, 720px);
  }
}

.module-i-banner { max-width:100%; height:auto; }

.module,.lesson,.card{max-width:900px;width:100%;margin:24px auto;box-sizing:border-box;}
iframe,video{display:block;width:100%!important;max-width:800px!important;height:450px!important;margin:20px auto;border-radius:12px;}
img{max-width:100%;height:auto;}