.hobby-section {
  position: relative;
  height: 400vh;
  padding-top: 120px;
}

.hobby-heading {
  position: sticky;
  top: 80px;
  text-align: center;
  font-size: 3rem;
  z-index: 100;
}

.scroll-stack {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 150px auto;
}

.stack-card {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 420px;
  border-radius: 40px;
  padding: 3rem;
  box-sizing: border-box;

  display: flex;
  align-items: center;
  justify-content: center;

  font-size: 2rem;
  font-weight: bold;
  color: white;

  background: linear-gradient(135deg, #6a11cb, #2575fc);
  box-shadow: 0 30px 80px rgba(0,0,0,0.4);

  transform-origin: top center;
  will-change: transform;
}

.stack-end {
  height: 1000px;
}

/* Light theme */
body.light .stack-card {
  background: linear-gradient(135deg, #124170, #67C090);
  color: #DDF4E7;
}