.multi-upload {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}
.drop-area {
  border: 2px dashed #d1d5db;
  border-radius: 16px;
  padding: 40px;
  text-align: center;
  background: #f9fafb;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}
.drop-area.highlight {
  border-color: #3b82f6;
  background: #eff6ff;
}
.upload-icon {
  color: #9ca3af;
  margin-bottom: 15px;
}
.drop-area h3 {
  margin: 0 0 10px 0;
  color: #1f2937;
}
.drop-area p {
  margin: 0;
  color: #6b7280;
  font-size: 0.95rem;
}
.browse-btn {
  color: #2563eb;
  font-weight: 600;
  text-decoration: underline;
}
.file-input {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
  cursor: pointer;
}
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 15px;
  margin-top: 20px;
}
.gallery-item {
  position: relative;
  width: 100%;
  height: 100px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.remove-file {
  position: absolute;
  top: 4px;
  right: 4px;
  background: rgba(0,0,0,0.6);
  color: white;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  cursor: pointer;
}

const dropArea = document.getElementById("dropArea");
const fileElem = document.getElementById("fileElem");
const gallery = document.getElementById("gallery");

// Prevent default drag behaviors
["dragenter", "dragover", "dragleave", "drop"].forEach(eventName => {
  dropArea.addEventListener(eventName, preventDefaults, false);
});

function preventDefaults(e) {
  e.preventDefault();
  e.stopPropagation();
}

// Highlight drop area when item is dragged over it
["dragenter", "dragover"].forEach(eventName => {
  dropArea.addEventListener(eventName, highlight, false);
});

["dragleave", "drop"].forEach(eventName => {
  dropArea.addEventListener(eventName, unhighlight, false);
});

function highlight() {
  dropArea.classList.add("highlight");
}

function unhighlight() {
  dropArea.classList.remove("highlight");
}

// Handle dropped files
dropArea.addEventListener("drop", handleDrop, false);

function handleDrop(e) {
  const dt = e.dataTransfer;
  const files = dt.files;
  handleFiles(files);
}

// Handle selected files via input
fileElem.addEventListener("change", function() {
  handleFiles(this.files);
});

function handleFiles(files) {
  ([...files]).forEach(previewFile);
}

function previewFile(file) {
  const reader = new FileReader();
  reader.readAsDataURL(file);
  reader.onloadend = function() {
    const img = document.createElement("img");
    img.src = reader.result;
    
    const div = document.createElement("div");
    div.classList.add("gallery-item");
    div.innerHTML = `<span class="remove-file" onclick="this.parentElement.remove()">&times;</span>`;
    div.appendChild(img);
    gallery.appendChild(div);
  };
}