.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 24px;
  border-radius: 16px;
  font-family: var(--font);
  font-size: 18px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.8; }

.btn-outline {
  background: #EEEEF2;
  color: #23262D;
}

.btn-telegram {
  background: #229ED9;
  color: #fff;
}

.btn-dark {
  background: #111;
  color: #fff;
}

.btn-pill {
  background: #EEEEF2;
  color: #23262D;
  border-radius: 24px;
  font-weight: 700;
}

.btn-glass {
  background: var(--glass, rgba(255, 255, 255, 0.08));
  backdrop-filter: blur(8px) saturate(160%) brightness(0.85);
  -webkit-backdrop-filter: blur(8px) saturate(160%) brightness(0.85);
  color: rgba(255, 255, 255, 0.95);
  border: none;
  position: relative;
}

.btn-glass::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 0.5px;
  background: linear-gradient(
    -45deg,
    rgba(255, 255, 255, 0.75) 0%,
    rgba(255, 255, 255, 0.10) 45%,
    rgba(255, 255, 255, 0.05) 55%,
    rgba(255, 255, 255, 0.30) 100%
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}