.btn-glass {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #ffffffcc;
    padding: 0.7rem 5rem;
    border-radius: 30px;
    font-size: clamp(0.9rem, 2.4vw, 1.1rem); 
    font-weight: 500;
    transition: all 0.3s ease;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    will-change: transform, backdrop-filter;
    text-decoration: none;
    display: inline-block;
    margin-top: 1.2rem;
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.02);
    transform: translateY(-2px);
    color: #a4d7f4;
    text-shadow: 0px 2px 20px #ACE5EE;
}

/* Button scroll */
.btn-scroll-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  will-change: transform, backdrop-filter;
  border: 1px solid rgba(255,255,255,0.2);
  color: #a4d7f4;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease, bottom 0.3s ease;
  z-index: 1000;
}

.btn-scroll-top i { filter: drop-shadow(0 0 8px rgba(164, 215, 244, 0.2)); }

.btn-scroll-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.btn-scroll-top:hover {
  background: rgba(164, 215, 244, 0.15);
  border-color: rgba(164, 215, 244, 0.4);
  transform: translateY(-3px);
}

@media (max-width: 480px) {
  .btn-scroll-top {
    width: 56px;
    height: 56px;
    font-size: 1.4rem;
    bottom: 16px;
    right: 16px;
  }
}