html, body {
  margin: 0;
  padding: 0;
  background: transparent;
  font-family: Arial, Helvetica, sans-serif;
  overflow: hidden;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.mga-container {
  width: 100%;
  max-width: 460px;
  margin: 0 auto;
}
h2 {
  color: #1F2937;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.15;
  margin: 0 0 20px;
  text-align: center;
}
.stack {
  display: flex;
  flex-direction: column-reverse;
  gap: 14px;
}
.foundation {
  height: 5px;
  background: #1F5E9C;
  opacity: 0;
  border-radius: 999px;
  transition: opacity .4s ease-out;
}
.block {
  padding: 16px 18px;
  border-radius: 14px;
  color: white;
  font-weight: 700;
  text-align: center;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
  transform: translateY(40px);
  opacity: 0;
  transition: all .6s cubic-bezier(.25,.1,.25,1);
}
.b1 { background: #2E77BB; }
.b2 { background: #1F5E9C; }
.b3 { background: #184C7D; }
.b4 { background: #153B61; }
.visible { opacity: 1 !important; transform: translateY(0); }
@media (max-width: 640px) {
  .mga-container { max-width: 100%; }
  .block { padding: 14px 14px; font-size: 14px; }
  h2 { font-size: 24px; }
}