/* Selection Stack Styles */
.selection-stack {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  margin: 0;
  padding: 0;
  width: 100vw;
  margin-left: calc(-50vw + 50%);
}

.select-btn {
  opacity: 0;
  transform: translateY(40px);
  width: 100%;
  height: 70vh;
  min-height: 600px;
  padding: 8rem 3rem;
  border: none;
  border-radius: 0;
  background: #000000;
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: none;
  border-bottom: 2px solid rgba(255, 255, 255, 0.1);
  transition: 
    transform 0.4s cubic-bezier(0.4, 2, 0.6, 1),
    background 0.5s ease,
    filter 0.3s ease,
    box-shadow 0.3s ease;
  outline: none;
}

/* Square button styling */
.select-btn.square {
  position: relative;
}

.select-btn.ux-ai {
  background: #000000;
}

.select-btn.art-design {
  background: #000000;
}

/* Button content */
.btn-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  display: block;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
  letter-spacing: 0.5rem;
}

.btn-text {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  display: block;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
  line-height: 1.1;
}

.btn-subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  font-weight: 400;
  display: block;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  max-width: 80%;
  margin: 0 auto;
  line-height: 1.3;
}

/* Hover and focus states */
.select-btn:focus,
.select-btn:hover {
  transform: scale(1.02);
  filter: brightness(1.2);
}

/* UX & AI Glossy Purple Hover */
.select-btn.ux-ai:hover {
  background: linear-gradient(135deg, #6b46c1 0%, #a855f7 50%, #9333ea 100%);
  box-shadow: 
    0 20px 40px rgba(168, 85, 247, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  position: relative;
}

.select-btn.ux-ai:hover::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.15), transparent);
  pointer-events: none;
}

/* Art & Design Glossy Orange Hover */
.select-btn.art-design:hover {
  background: linear-gradient(135deg, #ea580c 0%, #f59e0b 50%, #d97706 100%);
  box-shadow: 
    0 20px 40px rgba(245, 158, 11, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  position: relative;
}

.select-btn.art-design:hover::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.15), transparent);
  pointer-events: none;
}

/* Animation keyframes */
@keyframes fadeSlideUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive design */
@media (max-width: 768px) {
  .select-btn {
    min-height: 450px;
    height: 65vh;
    padding: 6rem 2rem;
  }
  
  .btn-text {
    font-size: 2.2rem;
  }
  
  .btn-icon {
    font-size: 3rem;
    letter-spacing: 0.3rem;
  }
  
  .btn-subtitle {
    font-size: 0.9rem;
    max-width: 90%;
  }
}

@media (max-width: 480px) {
  .select-btn {
    min-height: 350px;
    height: 60vh;
    padding: 4rem 1.5rem;
  }
  
  .btn-text {
    font-size: 1.8rem;
    letter-spacing: 0.02em;
  }
  
  .btn-icon {
    font-size: 2.5rem;
    letter-spacing: 0.2rem;
  }
  
  .btn-subtitle {
    font-size: 0.8rem;
    max-width: 95%;
    letter-spacing: 0.01em;
  }
}

/* Accessibility improvements */
.select-btn:focus {
  outline: 3px solid rgba(255, 255, 255, 0.5);
  outline-offset: 2px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  .select-btn:not(.prominent) {
    background: #1a1a1a;
    border-color: rgba(255, 255, 255, 0.1);
  }
  
  .select-btn:not(.prominent):hover {
    background: #2a2a2a;
  }
}