:root {
  --bg-color: #f8f9fa;
  --surface-color: #ffffff;
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --text-color: #1f2937;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

header {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-sm);
  z-index: 10;
}

h1 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-color);
}

.subtitle {
  font-size: 0.875rem;
  color: #6b7280;
  margin-left: 1rem;
}

main {
  flex: 1;
  display: flex;
  overflow: hidden;
}

#workspace {
  flex: 1;
  position: relative;
  background-color: #e5e7eb; /* Darker background for image area */
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: auto;
}

#imageContainer {
  position: relative;
  display: none; /* Hidden until image loaded */
  box-shadow: var(--shadow-md);
  cursor: crosshair;
}

#uploadedImage {
  display: block;
  max-width: 100%;
  max-height: 90vh; /* Prevent image from being too tall */
}

#markerOverlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.marker {
  position: absolute;
  width: 12px;
  height: 12px;
  background-color: #ef4444; /* Red */
  border: 2px solid white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Sidebar */
aside {
  width: 320px;
  background-color: var(--surface-color);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 5;
}

.sidebar-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-title {
  font-weight: 600;
  font-size: 1rem;
}

#clearMarkers {
  background: none;
  border: none;
  color: #ef4444;
  font-size: 0.875rem;
  cursor: pointer;
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}
#clearMarkers:hover {
  background-color: #fee2e2;
}

#outputList {
  list-style: none;
  padding: 0;
  margin: 0;
  overflow-y: auto;
  flex: 1;
}

.coordinate-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  transition: background-color 0.2s;
}
.coordinate-item:hover {
  background-color: #f3f4f6;
}

.coord-values {
  display: flex;
  gap: 1rem;
}
.coord-label {
  color: #6b7280;
  font-size: 0.75rem;
  margin-right: 0.25rem;
}
.coord-val {
  font-family: monospace;
  font-weight: 500;
}

.copy-btn {
  background-color: transparent;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  cursor: pointer;
  color: #6b7280;
  transition: all 0.2s;
}
.copy-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.sidebar-footer a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #6b7280;
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}
.sidebar-footer a:hover {
  color: var(--primary-color);
}

/* Upload Zone */
#uploadZone {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background-color: var(--bg-color);
  z-index: 20;
  transition: background-color 0.3s;
}
#uploadZone.dragover {
  background-color: #e0e7ff; /* Light blue tint */
  border: 2px dashed var(--primary-color);
}

.upload-content {
  text-align: center;
  padding: 2rem;
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  background-color: var(--surface-color);
}
#uploadZone.dragover .upload-content {
  border-color: transparent;
  background-color: transparent;
}

.upload-icon {
  font-size: 3rem;
  color: #9ca3af;
  margin-bottom: 1rem;
}

.upload-text {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.upload-subtext {
  font-size: 0.875rem;
  color: #6b7280;
  margin-bottom: 1.5rem;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
}

/* Toast */
#toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #1f2937;
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-size: 0.875rem;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
  z-index: 100;
}
#toast.show {
  opacity: 1;
}