.btn-premium,
.btn-ghost,
.lang-switcher-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 46px;
  padding: 0.86rem 1.35rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
  white-space: nowrap;
}

.btn-premium::before,
.btn-ghost::before {
  content: '';
  position: absolute;
  inset: 0 10px auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.46), transparent);
  opacity: 0.52;
  pointer-events: none;
}

.btn-premium::after,
.btn-ghost::after,
.lang-switcher-btn::after {
  content: '';
  position: absolute;
  top: -80%;
  bottom: -80%;
  left: -44%;
  width: 38%;
  transform: rotate(18deg);
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.22), transparent);
  opacity: 0;
  pointer-events: none;
  transition: left 0.36s ease, opacity 0.18s ease;
}

.btn-premium > *,
.btn-ghost > *,
.lang-switcher-btn > * {
  position: relative;
  z-index: 1;
}

.btn-premium {
  color: #072012;
  border: 1px solid rgba(185, 255, 212, 0.46);
  background:
    linear-gradient(135deg, #b5ffc9 0%, var(--primary) 45%, #49eaff 100%);
  box-shadow:
    0 10px 28px rgba(100, 255, 150, 0.2),
    inset 0 -1px 0 rgba(0, 0, 0, 0.18);
}

.btn-premium:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 32px rgba(100, 255, 150, 0.26);
}

.btn-ghost,
.lang-switcher-btn {
  color: var(--text-primary);
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(16, 23, 20, 0.8) 0%, rgba(7, 11, 9, 0.78) 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.03);
}

.btn-ghost:hover,
.lang-switcher-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(161, 255, 199, 0.22);
  background:
    linear-gradient(180deg, rgba(21, 31, 26, 0.86) 0%, rgba(9, 14, 11, 0.82) 100%);
}

.btn-premium:hover::after,
.btn-ghost:hover::after,
.lang-switcher-btn:hover::after {
  left: 112%;
  opacity: 1;
}

.btn-small {
  min-height: 38px;
  padding: 0.65rem 1rem;
  font-size: 0.86rem;
}