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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #2c2d79 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

.container {
  max-width: 1200px;
  width: 100%;
}

h1 {
  color: white;
  text-align: center;
  margin-bottom: 30px;
  font-size: 2.5rem;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.thumbnail {
  position: relative;
  border-radius: 15px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.thumbnail:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.thumbnail img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.thumbnail:hover img {
  transform: scale(1.1);
}

.upload-area {
  border: 3px dashed rgba(255, 255, 255, 0.5);
  border-radius: 15px;
  padding: 40px;
  text-align: center;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  margin-bottom: 30px;
  transition: all 0.3s ease;
}

.upload-area:hover {
  border-color: rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.15);
}

.upload-area.dragover {
  border-color: #4caf50;
  background: rgba(76, 175, 80, 0.1);
}

.upload-btn {
  background: linear-gradient(45deg, #4caf50, #45a049);
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 16px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.upload-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

#fileInput {
  display: none;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.95);
  backdrop-filter: blur(5px);
  animation: fadeIn 0.3s ease;
}

.modal.show {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

@keyframes slideIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-content {
  position: relative;
  max-width: 90%;
  max-height: 90%;
  animation: slideIn 0.3s ease;
}

.modal img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 10px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.close-btn {
  position: absolute;
  top: -15px;
  right: -15px;
  background: linear-gradient(45deg, #ff4757, #ff3742);
  color: white;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 71, 87, 0.4);
}

.close-btn:hover {
  transform: scale(1.1) rotate(90deg);
  box-shadow: 0 6px 20px rgba(255, 71, 87, 0.6);
}

.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  font-size: 30px;
  padding: 15px 20px;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.nav-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-50%) scale(1.1);
}

.prev-btn {
  left: 20px;
}

.next-btn {
  right: 20px;
}

.image-counter {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 14px;
  backdrop-filter: blur(10px);
}

.upload-text {
  color: white;
  font-size: 18px;
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  .gallery {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
  }

  .nav-btn {
    font-size: 24px;
    padding: 10px 15px;
  }

  .close-btn {
    width: 40px;
    height: 40px;
    font-size: 20px;
    top: -10px;
    right: -10px;
  }
}