* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background-color: #000;
  color: white;
  overflow: hidden;
  height: 100vh;
  font-family: sans-serif;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
}

.menu-btn {
  position: fixed;
  top: 20px;
  left: 20px;
  background: #333;
  color: white;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 20px;
  cursor: pointer;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
}

.menu-btn:hover {
  background: #555;
  transform: scale(1.1);
}

.folder-popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
}

.popup-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  background: #111;
  border-bottom: 1px solid #333;
  border-radius: 8px 8px 0 0;
}

.popup-header h3 {
  margin: 0;
  color: white;
}

.close-btn {
  background: none;
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-btn:hover {
  color: #ccc;
}

.folder-list {
  background: #111;
  padding: 0;
  max-width: 300px;
  width: 90%;
  max-height: 50vh;
  overflow-y: auto;
  border-radius: 8px;
}

.folder-item {
  padding: 12px 15px;
  background: #222;
  border: 1px solid #444;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
}

.folder-item:hover {
  background: #333;
  border-color: #666;
  transform: translateY(-2px);
}

.folder-item.active {
  background: #444;
  border-color: #007bff;
  box-shadow: 0 0 10px rgba(0, 123, 255, 0.3);
}

.folder-item h3 {
  margin: 0 0 5px 0;
  font-size: 16px;
  font-weight: 600;
}

.folder-item p {
  margin: 0;
  font-size: 12px;
  color: #ccc;
}

.slideshow-container {
  flex: 1 1 auto;
  display: flex;
  max-height: 75%;
  align-items: center;
  justify-content: center;
  background: #000;
  padding: 10px;
}

.no-selection {
  text-align: center;
  color: #666;
}

.no-selection h2 {
  margin: 0 0 10px 0;
  font-size: 20px;
  font-weight: 300;
}

.no-selection p {
  margin: 0;
  font-size: 14px;
}

.slideshow-container img {
  max-height: 75%;
  max-width: 100%;
  object-fit: contain;
  /* transition: opacity 0.4s linear; */
}

.thumbnail-strip {
  height: 150px;
  overflow-x: auto;
  white-space: nowrap;
  background: #111;
  padding: 5px;
  display: flex;
  gap: 10px;
}

.thumbnail-strip img {
  height: 120px;
  cursor: pointer;
  opacity: 0.6;
  transition: 0.3s;
  border: 2px solid transparent;
}

.thumbnail-strip img.active,
.thumbnail-strip img:hover {
  opacity: 1;
  border-color: white;
}