body{font-family:system-ui;background:#0b0f1c;color:#fff;padding:15px}
input,button{width:100%;padding:12px;margin:5px 0;border-radius:8px;border:none}
button{background:#2f6bff;color:#fff}
.mail{background:#111a33;padding:10px;margin:6px 0;border-radius:8px}
a{color:#4da3ff;text-decoration:none}
.yt-tutorial{
  margin-top:20px;
  text-align:center;
}

.yt-tutorial a{
  display:inline-block;
  width:100%;
  max-width:420px;
  padding:14px 18px;
  background:linear-gradient(135deg,#ff0000,#cc0000);
  color:#fff;
  font-weight:600;
  font-size:16px;
  border-radius:12px;
  text-decoration:none;
  box-shadow:0 6px 18px rgba(0,0,0,.35);
  transition:transform .15s ease, box-shadow .15s ease;
}

.yt-tutorial a:hover{
  transform:translateY(-1px);
  box-shadow:0 10px 24px rgba(0,0,0,.45);
}