/* Game Button Styles */
.btn {
    background: linear-gradient(180deg, var(--vault-blue), rgba(var(--vault-blue-rgb), 0.9));
    color: var(--vault-yellow);
    border: 2px solid var(--vault-yellow);
    border-radius: 8px;
    font-family: 'Share Tech Mono', monospace;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    -webkit-tap-highlight-color: transparent;
}

/* Ghost button variant */
.btn.ghost {
  background: transparent;
  border: 2px solid var(--vault-yellow);
  color: var(--vault-yellow);
  /* text-align: center; */
  text-align: center;
  padding: 0.5rem 1rem;
}

/* Hover effects */
.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--accent-glow), 0 6px 20px rgba(var(--vault-blue-rgb), 0.4);
}

.btn:hover::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  animation: shine 1.5s infinite;
}

/* Active state */
.btn:active {
  transform: translateY(1px);
  box-shadow: var(--accent-glow-intense);
}

/* Difficulty buttons specific styles */
.difficulty-btn {
  min-width: 100px;
  text-align: center;
  padding: 0.5rem 1rem;
}

.difficulty-btn.btn--active {
  background: var(--vault-yellow);
  color: var(--vault-blue);
  border-color: var(--vault-yellow);
  box-shadow: var(--accent-glow-intense);
}

.difficulty-btn:hover {
  background: linear-gradient(
    180deg,
    rgba(var(--vault-blue-rgb), 0.95),
    rgba(var(--vault-blue-rgb), 0.85)
  );
}

.difficulty-btn.btn--active:hover {
  background: var(--vault-yellow);
  transform: translateY(0);
}

/* Animations */
@keyframes shine {
  0% {
    left: -100%;
  }
  20% {
    left: 100%;
  }
  100% {
    left: 100%;
  }
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }

  .difficulty-btn {
    min-width: 90px;
    padding: 0.4rem 0.8rem;
  }
}

@media (max-width: 480px) {
  .btn {
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
  }

  .difficulty-btn {
    min-width: 80px;
    padding: 0.35rem 0.7rem;
  }
}

/* Prevent text selection */
.btn {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

/* Touch device optimizations */
@media (hover: none) {
  .btn:hover {
    transform: none;
    box-shadow: none;
  }

  .btn:hover::before {
    animation: none;
  }

  .btn:active {
    transform: scale(0.98);
    background: linear-gradient(
      180deg,
      rgba(var(--vault-blue-rgb), 0.9),
      rgba(var(--vault-blue-rgb), 0.8)
    );
  }
}