* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  padding: 20px;
  background: #1a1a1a;
  color: #ffffff;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

.tier-controls {
  margin-bottom: 20px;
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

button {
  padding: 10px 20px;
  cursor: pointer;
  background: #4CAF50;
  border: none;
  color: white;
  border-radius: 6px;
  font-weight: 600;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

button:active {
  transform: translateY(1px);
}

input[type="text"] {
  padding: 10px;
  border: 2px solid #444;
  border-radius: 6px;
  background: #2a2a2a;
  color: #ffffff;
  transition: border-color 0.2s ease;
  flex: 1;
  min-width: 150px;
}

input[type="text"]:focus {
  border-color: #4CAF50;
  outline: none;
}

.tier-row {
  display: flex;
  margin-bottom: 15px;
  min-height: 120px;
  background: #2a2a2a;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.tier-label {
  width: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: white;
  position: relative;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
}

.tier-text {
  min-width: 20px;
  padding: 4px 8px;
  border-radius: 4px;
  outline: none;
  text-align: center;
  font-size: 1.2em;
}

.tier-color-picker {
  width: 30px;
  height: 30px;
  padding: 0;
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: 4px;
  cursor: pointer;
}

.tier-content {
  flex-grow: 1;
  padding: 15px;
  min-height: 120px;
  background: rgba(0, 0, 0, 0.2);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: flex-start;
  transition: background-color 0.2s ease;
}

.image-controls {
  margin-top: 30px;
  background: #2a2a2a;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.image-pool {
  margin-top: 15px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  min-height: 120px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.image-container {
  position: relative;
  width: 100px;
  height: 100px;
  cursor: move;
}

.draggable-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 6px;
  transition: transform 0.2s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.delete-image {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 24px;
  height: 24px;
  padding: 0;
  background: #ff4444;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  opacity: 0;
  transition: all 0.2s ease;
  z-index: 2;
}

.shared-lists {
  margin-bottom: 40px;
  background: #2a2a2a;
  padding: 25px;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.shared-lists h2 {
  margin-bottom: 20px;
  color: #fff;
  font-size: 1.5em;
}

.shared-lists-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.shared-list-card {
  background: #333;
  padding: 20px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.shared-list-card:hover {
  transform: translateY(-2px);
  background: #444;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
  body {
    padding: 10px;
  }

  .tier-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .tier-controls input[type="text"],
  .tier-controls button {
    width: 100%;
  }

  .tier-row {
    flex-direction: column;
    min-height: auto;
  }

  .tier-label {
    width: 100%;
    flex-direction: row;
    justify-content: space-between;
    padding: 10px;
  }

  .tier-content {
    min-height: 100px;
    justify-content: center;
  }

  .image-container {
    width: 80px;
    height: 80px;
  }

  .shared-lists-container {
    grid-template-columns: 1fr;
  }

  .delete-image {
    opacity: 1;
  }
}

/* Touch Device Optimization */
@media (hover: none) {
  .delete-image {
    opacity: 1;
  }

  .shared-list-card:hover {
    transform: none;
  }
}

/* Loading State */
.loading {
  opacity: 0.7;
  pointer-events: none;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.tier-row, .shared-list-card {
  animation: fadeIn 0.3s ease;
}