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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #1a1a1a;
  color: #fff;
  height: 100vh;
  overflow: hidden;
}

#viewer-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* Toolbar */
#toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: linear-gradient(to bottom, #2d2d2d, #1a1a1a);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  flex-shrink: 0;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.2);
  margin: 0 4px;
}

.toolbar-spacer {
  flex: 1;
}

#toolbar button {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s ease;
  white-space: nowrap;
}

#toolbar button:hover:not(:disabled) {
  background: rgba(100, 200, 255, 0.3);
  border-color: #64c8ff;
}

#toolbar button:active:not(:disabled) {
  transform: scale(0.95);
}

#toolbar button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#toolbar button.active {
  background: rgba(100, 200, 255, 0.4);
  border-color: #64c8ff;
}

#zoom-level {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.8);
  min-width: 50px;
  text-align: center;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
}

#image-info {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 300px;
}

/* Drop zone */
#drop-zone {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  border: 3px dashed rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  margin: 20px;
  transition: all 0.3s ease;
}

#drop-zone.active {
  display: flex;
}

#drop-zone.drag-over {
  border-color: #64c8ff;
  background: rgba(100, 200, 255, 0.1);
}

.drop-content {
  text-align: center;
  padding: 40px;
}

.drop-content .icon {
  font-size: 80px;
  display: block;
  margin-bottom: 20px;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.drop-content h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 12px;
  background: linear-gradient(90deg, #64c8ff, #a0e0ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.drop-content p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 16px;
  margin-bottom: 8px;
}

.drop-content .formats {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

/* Image wrapper */
#image-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: #0d0d0d;
  position: relative;
  cursor: grab;
}

#image-wrapper.hidden {
  display: none;
}

#image-wrapper.dragging {
  cursor: grabbing;
}

#image-wrapper.zoom-fit {
  cursor: default;
}

#image-container {
  position: relative;
  transform-origin: center center;
  transition: transform 0.1s ease-out;
}

#image {
  display: block;
  max-width: none;
  max-height: none;
  user-select: none;
  -webkit-user-drag: none;
  image-rendering: auto;
}

/* Checkerboard background for transparent images */
#image-wrapper.show-transparency #image-container {
  background-image: linear-gradient(45deg, #2a2a2a 25%, transparent 25%),
    linear-gradient(-45deg, #2a2a2a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2a2a2a 75%),
    linear-gradient(-45deg, transparent 75%, #2a2a2a 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
}

/* Loading state */
#image-wrapper.loading::after {
  content: '⏳ Loading...';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 24px;
  color: rgba(255, 255, 255, 0.8);
  z-index: 10;
}

/* Smooth zoom animation */
#image-container.animating {
  transition: transform 0.2s ease-out;
}