diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6a68a0a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+node_modules/
+uploads/*
+!uploads/.gitkeep
+.DS_Store
+*.log
diff --git a/README.md b/README.md
index da29a78..8c23131 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,35 @@
-hi 
-this was supposed to be like a website but :(
+# katdrop
+
+a minimal, smooth file transfer service.
+
+## features
+
+- minimal dark interface with smooth interactive particle background
+- drag & drop files anywhere to upload instantly
+- 10-minute auto-deletion timer per file with live countdown
+- sleek upload progress bar
+- safe path verification and collision-free file naming
+- zero external CDN dependencies (works completely offline)
+
+## usage
+
+```bash
+# install dependencies
+npm install
+
+# start server
+npm start
+```
+
+Runs by default on `http://localhost:3000` (or falls back to an available port if 3000 is in use).
+
+## endpoints
+
+- `POST /upload` - upload files (`file`)
+- `GET /files` - list files
+- `GET /uploads/:filename` - download file
+- `DELETE /delete/:filename` - delete file
+
+## license
+
+MIT
diff --git a/index.html b/index.html
deleted file mode 100644
index ede1951..0000000
--- a/index.html
+++ /dev/null
@@ -1,106 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-  <meta charset="UTF-8">
-  <title>File Share</title>
-  <script src="https://cdn.jsdelivr.net/npm/particles.js"></script>
-  <style>
-    body {
-      margin: 0;
-      font-family: Arial, sans-serif;
-      background: #0d0d0d;
-      color: #fff;
-      text-align: center;
-    }
-    #particles-js {
-      position: fixed;
-      top: 0; left: 0;
-      width: 100%; height: 100%;
-      z-index: -1;
-    }
-    .container {
-      margin-top: 100px;
-    }
-    button, input[type="file"] {
-      margin: 10px;
-      padding: 10px 20px;
-      background: #1a1a1a;
-      color: #fff;
-      border: 1px solid #333;
-      border-radius: 5px;
-      cursor: pointer;
-    }
-    button:hover {
-      background: #333;
-    }
-    ul {
-      list-style: none;
-      padding: 0;
-    }
-    li {
-      margin: 10px 0;
-    }
-    a {
-      color: #4db8ff;
-      text-decoration: none;
-      margin-right: 10px;
-    }
-    a:hover {
-      text-decoration: underline;
-    }
-  </style>
-</head>
-<body>
-  <div id="particles-js"></div>
-  <div class="container">
-    <h1>File Share</h1>
-    <form id="uploadForm" enctype="multipart/form-data">
-      <input type="file" name="file" required>
-      <button type="submit">Upload</button>
-    </form>
-    <h2>Available Files</h2>
-    <ul id="fileList"></ul>
-  </div>
-
-  <script>
-    // Particle background
-    particlesJS.load('particles-js', 'https://cdn.jsdelivr.net/gh/VincentGarreau/particles.js/demo/particles.json');
-
-    // Fetch file list
-    async function fetchFiles() {
-      const res = await fetch('/files');
-      const files = await res.json();
-      const fileList = document.getElementById('fileList');
-      fileList.innerHTML = '';
-      files.forEach(file => {
-        const li = document.createElement('li');
-        li.innerHTML = `
-          <a href="/uploads/${file}" download>${file}</a>
-          <button onclick="deleteFile('${file}')">Delete</button>
-        `;
-        fileList.appendChild(li);
-      });
-    }
-
-    // Upload file
-    document.getElementById('uploadForm').addEventListener('submit', async e => {
-      e.preventDefault();
-      const formData = new FormData(e.target);
-      await fetch('/upload', {
-        method: 'POST',
-        body: formData
-      });
-      e.target.reset();
-      fetchFiles();
-    });
-
-    // Delete file
-    async function deleteFile(filename) {
-      await fetch(`/delete/${filename}`, { method: 'DELETE' });
-      fetchFiles();
-    }
-
-    fetchFiles();
-  </script>
-</body>
-</html>
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..fe3afb3
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1014 @@
+{
+  "name": "file-server",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "file-server",
+      "version": "1.0.0",
+      "dependencies": {
+        "express": "^4.18.2",
+        "multer": "1.4.5-lts.1"
+      }
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+      "license": "MIT",
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+        "negotiator": "0.6.3"
+      },
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+      "license": "MIT",
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+      "license": "MIT",
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+}
diff --git a/package.json b/package.json
index 8eaeed4..cc7a28d 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,22 @@
 {
-  "name": "file-server",
-  "version": "1.0.0",
+  "name": "katdrop",
+  "version": "2.0.0",
+  "description": "Fast, sleek, local & web file transfer service",
   "main": "server.js",
   "scripts": {
     "start": "node server.js"
   },
+  "keywords": [
+    "file-transfer",
+    "file-drop",
+    "lan-share",
+    "express",
+    "katdrop"
+  ],
+  "author": "oiupoyt",
+  "license": "MIT",
   "dependencies": {
-    "express": "^4.18.2",
-    "multer": "1.4.5-lts.1"
+    "express": "^4.21.2",
+    "multer": "^1.4.5-lts.1"
   }
 }
diff --git a/public/css/style.css b/public/css/style.css
new file mode 100644
index 0000000..9dd6214
--- /dev/null
+++ b/public/css/style.css
@@ -0,0 +1,340 @@
+* {
+  box-sizing: border-box;
+  margin: 0;
+  padding: 0;
+  border-radius: 0 !important; /* Square everything out */
+}
+
+body {
+  font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
+  background: #0b0b0b;
+  color: #e5e5e5;
+  min-height: 100vh;
+  position: relative;
+  overflow-x: hidden;
+  -webkit-font-smoothing: antialiased;
+}
+
+#particles {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  pointer-events: none;
+  z-index: 0;
+}
+
+.container {
+  position: relative;
+  z-index: 1;
+  max-width: 620px;
+  margin: 75px auto 60px;
+  padding: 0 20px;
+}
+
+.header {
+  text-align: center;
+  margin-bottom: 30px;
+}
+
+h1 {
+  font-size: 2.2rem;
+  font-weight: 600;
+  letter-spacing: -0.04em;
+  color: #fff;
+  margin-bottom: 4px;
+}
+
+.subtitle {
+  font-size: 0.8rem;
+  color: #555;
+  letter-spacing: 0.05em;
+  text-transform: lowercase;
+}
+
+/* Upload Drop Zone */
+.drop-zone {
+  border: 1px dashed #2a2a2a;
+  padding: 26px 20px;
+  background: rgba(15, 15, 15, 0.7);
+  backdrop-filter: blur(6px);
+  text-align: center;
+  transition: border-color 0.2s ease, background-color 0.2s ease;
+}
+
+.drop-zone.dragover {
+  border-color: #555;
+  background: rgba(24, 24, 24, 0.85);
+}
+
+.drop-actions {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  gap: 10px;
+}
+
+.btn {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  padding: 8px 18px;
+  background: #161616;
+  color: #ddd;
+  border: 1px solid #303030;
+  font-size: 0.8rem;
+  font-family: inherit;
+  cursor: pointer;
+  user-select: none;
+  text-decoration: none;
+  letter-spacing: 0.02em;
+  transition: all 0.15s ease;
+}
+
+.btn:hover:not(:disabled) {
+  background: #242424;
+  border-color: #555;
+  color: #fff;
+}
+
+.btn:active:not(:disabled) {
+  background: #fff;
+  color: #000;
+  border-color: #fff;
+}
+
+.btn:disabled {
+  opacity: 0.3;
+  cursor: not-allowed;
+}
+
+.btn-upload {
+  background: #1f1f1f;
+  border-color: #383838;
+}
+
+.file-selection {
+  display: none;
+  margin-top: 14px;
+  font-size: 0.74rem;
+  color: #777;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  animation: fadeIn 0.15s ease;
+}
+
+.file-selection.active {
+  display: block;
+}
+
+/* Minimal Square Progress Bar */
+.progress-wrap {
+  display: none;
+  width: 100%;
+  height: 2px;
+  background: #1c1c1c;
+  margin-top: 12px;
+  overflow: hidden;
+}
+
+.progress-wrap.active {
+  display: block;
+  animation: fadeIn 0.15s ease;
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; transform: translateY(-3px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+
+/* Files Section */
+.files-section {
+  margin-top: 42px;
+}
+
+.files-header {
+  display: flex;
+  align-items: baseline;
+  justify-content: space-between;
+  border-bottom: 1px solid #1c1c1c;
+  padding-bottom: 10px;
+  margin-bottom: 12px;
+}
+
+h2 {
+  font-size: 0.76rem;
+  font-weight: 500;
+  text-transform: uppercase;
+  letter-spacing: 0.12em;
+  color: #666;
+}
+
+.file-count {
+  font-size: 0.72rem;
+  color: #444;
+}
+
+ul {
+  list-style: none;
+  padding: 0;
+}
+
+/* File Card Items */
+li.file-card {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 14px;
+  padding: 12px 14px;
+  margin-bottom: 6px;
+  background: rgba(17, 17, 17, 0.75);
+  border: 1px solid #202020;
+  transition: border-color 0.15s ease, background-color 0.15s ease, opacity 0.2s ease;
+}
+
+li.file-card:hover {
+  background: rgba(24, 24, 24, 0.9);
+  border-color: #333;
+}
+
+li.file-card.deleting {
+  opacity: 0;
+  transform: translateY(-4px);
+  pointer-events: none;
+}
+
+.file-info {
+  display: flex;
+  align-items: baseline;
+  gap: 12px;
+  min-width: 0;
+  flex: 1;
+}
+
+.file-name {
+  color: #e2e2e2;
+  font-size: 0.84rem;
+  font-weight: 500;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  max-width: 360px;
+}
+
+.file-meta {
+  display: flex;
+  align-items: baseline;
+  gap: 10px;
+  flex-shrink: 0;
+}
+
+.file-size {
+  font-size: 0.7rem;
+  color: #555;
+  white-space: nowrap;
+}
+
+.file-timer {
+  font-size: 0.7rem;
+  color: #666;
+  white-space: nowrap;
+  letter-spacing: 0.04em;
+  font-variant-numeric: tabular-nums;
+}
+
+.file-timer.warning {
+  color: #f59e0b;
+}
+
+.file-timer.critical {
+  color: #ff5555;
+}
+
+.file-actions {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  flex-shrink: 0;
+}
+
+.action-btn {
+  padding: 4px 10px;
+  font-size: 0.72rem;
+  font-family: inherit;
+  text-decoration: none;
+  background: #141414;
+  border: 1px solid #262626;
+  cursor: pointer;
+  letter-spacing: 0.02em;
+  transition: all 0.15s ease;
+}
+
+.action-download {
+  color: #4db8ff;
+}
+
+.action-download:hover {
+  background: #4db8ff;
+  color: #000;
+  border-color: #4db8ff;
+}
+
+.action-delete {
+  color: #666;
+}
+
+.action-delete:hover {
+  background: #ff5555;
+  color: #000;
+  border-color: #ff5555;
+}
+
+.empty-state {
+  text-align: center;
+  color: #3a3a3a;
+  font-size: 0.78rem;
+  padding: 30px 0;
+  border: 1px dashed #1a1a1a;
+  margin-top: 4px;
+}
+
+/* Toast */
+.toast {
+  position: fixed;
+  bottom: 24px;
+  left: 50%;
+  transform: translateX(-50%) translateY(10px);
+  background: #141414;
+  border: 1px solid #2f2f2f;
+  color: #ccc;
+  font-size: 0.75rem;
+  padding: 6px 14px;
+  opacity: 0;
+  pointer-events: none;
+  transition: all 0.15s ease;
+  z-index: 10;
+  letter-spacing: 0.02em;
+}
+
+.toast.show {
+  opacity: 1;
+  transform: translateX(-50%) translateY(0);
+}
+
+@media (max-width: 520px) {
+  .container {
+    margin-top: 40px;
+    padding: 0 14px;
+  }
+  
+  .file-name {
+    max-width: 170px;
+  }
+
+  .file-info {
+    flex-direction: column;
+    gap: 2px;
+  }
+}
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 0000000..6294a78
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>katdrop</title>
+  <link rel="preconnect" href="https://fonts.googleapis.com">
+  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+  <link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&display=swap" rel="stylesheet">
+  <link rel="stylesheet" href="/css/style.css">
+</head>
+<body>
+  <canvas id="particles"></canvas>
+
+  <main class="container">
+    <header class="header">
+      <h1>katdrop</h1>
+      <p class="subtitle">// minimal file transfer</p>
+    </header>
+
+    <div class="drop-zone" id="dropZone">
+      <input type="file" id="fileInput" multiple hidden>
+      <div class="drop-actions">
+        <label for="fileInput" class="btn">choose files</label>
+        <button id="uploadBtn" class="btn btn-upload" disabled>upload</button>
+      </div>
+      <div id="fileSelection" class="file-selection"></div>
+      <div class="progress-wrap" id="progressWrap">
+        <div class="progress-bar" id="progressBar"></div>
+      </div>
+    </div>
+
+    <section class="files-section">
+      <div class="files-header">
+        <h2>available files</h2>
+        <span id="fileCount" class="file-count">0 files</span>
+      </div>
+      <ul id="fileList"></ul>
+    </section>
+  </main>
+
+  <div id="toast" class="toast"></div>
+
+  <script src="/js/app.js"></script>
+</body>
+</html>
diff --git a/public/js/app.js b/public/js/app.js
new file mode 100644
index 0000000..e44d35c
--- /dev/null
+++ b/public/js/app.js
@@ -0,0 +1,386 @@
+/**
+ * katdrop - minimal, smooth, and interactive
+ */
+(function () {
+  'use strict';
+
+  // DOM Elements
+  const dropZone = document.getElementById('dropZone');
+  const fileInput = document.getElementById('fileInput');
+  const uploadBtn = document.getElementById('uploadBtn');
+  const fileSelection = document.getElementById('fileSelection');
+  const progressWrap = document.getElementById('progressWrap');
+  const progressBar = document.getElementById('progressBar');
+  const fileList = document.getElementById('fileList');
+  const fileCount = document.getElementById('fileCount');
+  const toastEl = document.getElementById('toast');
+
+  let selectedFiles = [];
+
+  // Toast
+  let toastTimeout;
+  function showToast(msg) {
+    clearTimeout(toastTimeout);
+    toastEl.textContent = `// ${msg}`;
+    toastEl.classList.add('show');
+    toastTimeout = setTimeout(() => {
+      toastEl.classList.remove('show');
+    }, 2200);
+  }
+
+  // Interactive Particle Background
+  function initInteractiveParticles() {
+    const canvas = document.getElementById('particles');
+    if (!canvas) return;
+    const ctx = canvas.getContext('2d');
+
+    let width = (canvas.width = window.innerWidth);
+    let height = (canvas.height = window.innerHeight);
+
+    window.addEventListener('resize', () => {
+      width = canvas.width = window.innerWidth;
+      height = canvas.height = window.innerHeight;
+    });
+
+    // Mouse tracking for interactivity
+    const mouse = {
+      x: null,
+      y: null,
+      radius: 140
+    };
+
+    window.addEventListener('mousemove', e => {
+      mouse.x = e.clientX;
+      mouse.y = e.clientY;
+    });
+
+    window.addEventListener('mouseleave', () => {
+      mouse.x = null;
+      mouse.y = null;
+    });
+
+    // Click to push particles slightly
+    window.addEventListener('click', e => {
+      for (const p of particles) {
+        const dx = p.x - e.clientX;
+        const dy = p.y - e.clientY;
+        const dist = Math.sqrt(dx * dx + dy * dy);
+        if (dist < 180 && dist > 0) {
+          const force = (180 - dist) / 180;
+          p.vx += (dx / dist) * force * 3;
+          p.vy += (dy / dist) * force * 3;
+        }
+      }
+    });
+
+    const particles = [];
+    const count = Math.min(50, Math.floor(width / 26));
+
+    for (let i = 0; i < count; i++) {
+      particles.push({
+        x: Math.random() * width,
+        y: Math.random() * height,
+        vx: (Math.random() - 0.5) * 0.45,
+        vy: (Math.random() - 0.5) * 0.45,
+        radius: Math.random() * 1.5 + 1
+      });
+    }
+
+    function animate() {
+      ctx.clearRect(0, 0, width, height);
+
+      // Connect particles to each other
+      for (let i = 0; i < particles.length; i++) {
+        for (let j = i + 1; j < particles.length; j++) {
+          const dx = particles[i].x - particles[j].x;
+          const dy = particles[i].y - particles[j].y;
+          const dist = Math.sqrt(dx * dx + dy * dy);
+          if (dist < 115) {
+            ctx.strokeStyle = `rgba(255, 255, 255, ${0.06 * (1 - dist / 115)})`;
+            ctx.lineWidth = 0.8;
+            ctx.beginPath();
+            ctx.moveTo(particles[i].x, particles[i].y);
+            ctx.lineTo(particles[j].x, particles[j].y);
+            ctx.stroke();
+          }
+        }
+      }
+
+      // Update & draw particles + connect to mouse
+      for (const p of particles) {
+        p.x += p.vx;
+        p.y += p.vy;
+
+        // Dampen velocity back to normal
+        p.vx *= 0.985;
+        p.vy *= 0.985;
+
+        // Boundary bounce
+        if (p.x < 0) { p.x = 0; p.vx *= -1; }
+        if (p.x > width) { p.x = width; p.vx *= -1; }
+        if (p.y < 0) { p.y = 0; p.vy *= -1; }
+        if (p.y > height) { p.y = height; p.vy *= -1; }
+
+        // Interaction with mouse cursor
+        if (mouse.x !== null && mouse.y !== null) {
+          const mdx = mouse.x - p.x;
+          const mdy = mouse.y - p.y;
+          const mDist = Math.sqrt(mdx * mdx + mdy * mdy);
+
+          if (mDist < mouse.radius) {
+            // Connect line to mouse
+            ctx.strokeStyle = `rgba(77, 184, 255, ${0.18 * (1 - mDist / mouse.radius)})`;
+            ctx.lineWidth = 0.9;
+            ctx.beginPath();
+            ctx.moveTo(p.x, p.y);
+            ctx.lineTo(mouse.x, mouse.y);
+            ctx.stroke();
+
+            // Repel gently if very close
+            if (mDist < 70 && mDist > 0) {
+              const repel = (70 - mDist) / 70;
+              p.x -= (mdx / mDist) * repel * 1.5;
+              p.y -= (mdy / mDist) * repel * 1.5;
+            }
+          }
+        }
+
+        // Draw particle dot
+        ctx.fillStyle = 'rgba(255, 255, 255, 0.28)';
+        ctx.beginPath();
+        ctx.arc(p.x, p.y, p.radius, 0, Math.PI * 2);
+        ctx.fill();
+      }
+
+      requestAnimationFrame(animate);
+    }
+
+    animate();
+  }
+
+  // Safe HTML helper
+  function escapeHtml(str) {
+    return String(str)
+      .replace(/&/g, '&amp;')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;')
+      .replace(/'/g, '&#039;');
+  }
+
+  // Countdown Timer Management
+  let countdownTimer = null;
+
+  function formatTimeLeft(seconds) {
+    if (seconds <= 0) return '00:00';
+    const m = Math.floor(seconds / 60);
+    const s = seconds % 60;
+    return `${m.toString().padStart(2, '0')}:${s.toString().padStart(2, '0')}`;
+  }
+
+  function tickCountdowns() {
+    const timerEls = document.querySelectorAll('.file-timer');
+    if (timerEls.length === 0) return;
+
+    const now = Date.now();
+    let hasExpired = false;
+
+    timerEls.forEach(el => {
+      const expires = parseInt(el.dataset.expiresMs, 10);
+      if (isNaN(expires)) return;
+
+      const remainingSec = Math.max(0, Math.ceil((expires - now) / 1000));
+      el.textContent = formatTimeLeft(remainingSec);
+
+      if (remainingSec <= 30) {
+        el.className = 'file-timer critical';
+      } else if (remainingSec <= 120) {
+        el.className = 'file-timer warning';
+      } else {
+        el.className = 'file-timer';
+      }
+
+      if (remainingSec === 0) {
+        hasExpired = true;
+        const card = el.closest('li.file-card');
+        if (card) card.classList.add('deleting');
+      }
+    });
+
+    if (hasExpired) {
+      setTimeout(fetchFiles, 400);
+    }
+  }
+
+  function startCountdownLoop() {
+    if (countdownTimer) clearInterval(countdownTimer);
+    tickCountdowns();
+    countdownTimer = setInterval(tickCountdowns, 1000);
+  }
+
+  // Fetch and display files
+  async function fetchFiles() {
+    try {
+      const res = await fetch('/files');
+      const files = await res.json();
+      fileList.innerHTML = '';
+
+      if (!files || files.length === 0) {
+        fileList.innerHTML = '<li class="empty-state">// no files uploaded yet</li>';
+        if (fileCount) fileCount.textContent = '0 files';
+        return;
+      }
+
+      if (fileCount) {
+        fileCount.textContent = `${files.length} file${files.length === 1 ? '' : 's'}`;
+      }
+
+      files.forEach(file => {
+        const li = document.createElement('li');
+        li.className = 'file-card';
+        const name = typeof file === 'string' ? file : file.name;
+        const size = typeof file === 'object' && file.sizeFormatted ? file.sizeFormatted : '';
+        const expiresMs = file.expiresAt ? new Date(file.expiresAt).getTime() : (Date.now() + 600000);
+        const remainingSec = Math.max(0, Math.ceil((expiresMs - Date.now()) / 1000));
+
+        li.innerHTML = `
+          <div class="file-info">
+            <span class="file-name" title="${escapeHtml(name)}">${escapeHtml(name)}</span>
+            <div class="file-meta">
+              ${size ? `<span class="file-size">${escapeHtml(size)}</span>` : ''}
+              <span class="file-timer" data-expires-ms="${expiresMs}" title="Auto-deletes in">${formatTimeLeft(remainingSec)}</span>
+            </div>
+          </div>
+          <div class="file-actions">
+            <a href="/uploads/${encodeURIComponent(name)}" class="action-btn action-download" download>download</a>
+            <button class="action-btn action-delete" onclick="deleteFile('${escapeHtml(name)}', this.closest('li'))">delete</button>
+          </div>
+        `;
+        fileList.appendChild(li);
+      });
+
+      startCountdownLoop();
+    } catch (err) {
+      console.error(err);
+      fileList.innerHTML = '<li class="empty-state">// error reading files</li>';
+    }
+  }
+
+  // Delete file with smooth animation
+  window.deleteFile = async function (filename, cardElement) {
+    if (cardElement) cardElement.classList.add('deleting');
+
+    try {
+      const res = await fetch(`/delete/${encodeURIComponent(filename)}`, { method: 'DELETE' });
+      if (res.ok) {
+        showToast('file deleted');
+        setTimeout(() => {
+          fetchFiles();
+        }, 180);
+      } else {
+        if (cardElement) cardElement.classList.remove('deleting');
+        showToast('failed to delete');
+      }
+    } catch (err) {
+      if (cardElement) cardElement.classList.remove('deleting');
+      showToast('delete error');
+    }
+  };
+
+  // Update selected files
+  function updateFileSelection(files) {
+    selectedFiles = Array.from(files);
+    if (selectedFiles.length === 0) {
+      fileSelection.textContent = '';
+      fileSelection.classList.remove('active');
+      uploadBtn.disabled = true;
+    } else if (selectedFiles.length === 1) {
+      fileSelection.textContent = `> ${selectedFiles[0].name}`;
+      fileSelection.classList.add('active');
+      uploadBtn.disabled = false;
+    } else {
+      fileSelection.textContent = `> ${selectedFiles.length} files selected`;
+      fileSelection.classList.add('active');
+      uploadBtn.disabled = false;
+    }
+  }
+
+  // Upload files with smooth progress bar
+  function uploadSelectedFiles() {
+    if (selectedFiles.length === 0) return;
+
+    const formData = new FormData();
+    selectedFiles.forEach(f => formData.append('file', f));
+
+    progressWrap.classList.add('active');
+    progressBar.style.width = '0%';
+    uploadBtn.disabled = true;
+
+    const xhr = new XMLHttpRequest();
+
+    xhr.upload.addEventListener('progress', e => {
+      if (e.lengthComputable) {
+        const pct = Math.round((e.loaded / e.total) * 100);
+        progressBar.style.width = `${pct}%`;
+      }
+    });
+
+    xhr.onload = () => {
+      progressBar.style.width = '100%';
+      setTimeout(() => {
+        progressWrap.classList.remove('active');
+        progressBar.style.width = '0%';
+        fileInput.value = '';
+        updateFileSelection([]);
+        fetchFiles();
+        showToast('upload complete');
+      }, 250);
+    };
+
+    xhr.onerror = () => {
+      progressWrap.classList.remove('active');
+      uploadBtn.disabled = false;
+      showToast('upload failed');
+    };
+
+    xhr.open('POST', '/upload');
+    xhr.send(formData);
+  }
+
+  // Listeners
+  fileInput.addEventListener('change', e => {
+    updateFileSelection(e.target.files);
+  });
+
+  uploadBtn.addEventListener('click', () => {
+    uploadSelectedFiles();
+  });
+
+  // Drag and drop
+  ['dragenter', 'dragover'].forEach(name => {
+    dropZone.addEventListener(name, e => {
+      e.preventDefault();
+      dropZone.classList.add('dragover');
+    });
+    window.addEventListener(name, e => e.preventDefault());
+  });
+
+  ['dragleave', 'drop'].forEach(name => {
+    dropZone.addEventListener(name, e => {
+      e.preventDefault();
+      dropZone.classList.remove('dragover');
+    });
+    window.addEventListener(name, e => e.preventDefault());
+  });
+
+  dropZone.addEventListener('drop', e => {
+    if (e.dataTransfer && e.dataTransfer.files && e.dataTransfer.files.length > 0) {
+      updateFileSelection(e.dataTransfer.files);
+      uploadSelectedFiles();
+    }
+  });
+
+  // Init
+  initInteractiveParticles();
+  fetchFiles();
+})();
diff --git a/server.js b/server.js
index 13ae835..1f9429b 100644
--- a/server.js
+++ b/server.js
@@ -1,46 +1,211 @@
 const express = require('express');
-const multer  = require('multer');
+const multer = require('multer');
 const fs = require('fs');
 const path = require('path');
 
 const app = express();
-const PORT = process.env.PORT || 3000;
+let currentPort = parseInt(process.env.PORT, 10) || 3000;
 
+// Directories
 const uploadDir = path.join(__dirname, 'uploads');
-if (!fs.existsSync(uploadDir)) fs.mkdirSync(uploadDir);
+const publicDir = path.join(__dirname, 'public');
 
-// File storage setup
+if (!fs.existsSync(uploadDir)) {
+  fs.mkdirSync(uploadDir, { recursive: true });
+}
+
+// 10-Minute File Expiration (in milliseconds)
+const FILE_TTL_MS = 10 * 60 * 1000;
+
+// Utility: format file size
+function formatBytes(bytes) {
+  if (!bytes || bytes === 0) return '0 B';
+  const k = 1024;
+  const sizes = ['B', 'KB', 'MB', 'GB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
+}
+
+// Utility: Safe unique filename (prevent overwrites and directory traversal)
+function getSafeUniqueName(destination, originalName) {
+  const base = path.basename(originalName).replace(/[^\w\s.-]/gi, '_').trim() || 'file';
+  const ext = path.extname(base);
+  const nameOnly = path.basename(base, ext) || 'file';
+
+  let candidate = `${nameOnly}${ext}`;
+  let counter = 1;
+  while (fs.existsSync(path.join(destination, candidate))) {
+    candidate = `${nameOnly} (${counter})${ext}`;
+    counter++;
+  }
+  return candidate;
+}
+
+// Utility: Validate path and prevent directory traversal
+function getSafeFilePath(filename) {
+  if (!filename || typeof filename !== 'string') return null;
+  const safeName = path.basename(filename);
+  const resolvedPath = path.resolve(uploadDir, safeName);
+  if (!resolvedPath.startsWith(uploadDir + path.sep) && resolvedPath !== uploadDir) {
+    return null;
+  }
+  return { resolvedPath, safeName };
+}
+
+// Automatic cleanup of expired files (older than 10 minutes)
+async function cleanupExpiredFiles() {
+  try {
+    const entries = await fs.promises.readdir(uploadDir);
+    const now = Date.now();
+
+    for (const name of entries) {
+      if (name.startsWith('.')) continue; // Preserve .gitkeep and hidden files
+      const fullPath = path.join(uploadDir, name);
+      try {
+        const stats = await fs.promises.stat(fullPath);
+        if (stats.isFile() && (now - stats.mtimeMs) >= FILE_TTL_MS) {
+          await fs.promises.unlink(fullPath);
+        }
+      } catch (err) {
+        // Ignore files already deleted or locked
+      }
+    }
+  } catch (err) {
+    // Ignore read errors during sweep
+  }
+}
+
+// Run cleanup sweep every 10 seconds (unref'd to prevent blocking process exit)
+const cleanupInterval = setInterval(cleanupExpiredFiles, 10 * 1000);
+cleanupInterval.unref();
+
+// Multer storage
 const storage = multer.diskStorage({
   destination: (req, file, cb) => cb(null, uploadDir),
-  filename: (req, file, cb) => cb(null, file.originalname)
+  filename: (req, file, cb) => {
+    cb(null, getSafeUniqueName(uploadDir, file.originalname));
+  }
 });
-const upload = multer({ storage });
-
-// Middleware
-app.use(express.static(__dirname)); // serve index.html
-app.use('/uploads', express.static(uploadDir));
-
-// Upload endpoint
-app.post('/upload', upload.single('file'), (req, res) => {
-  res.send('File uploaded!');
+const upload = multer({
+  storage,
+  limits: { fileSize: 2 * 1024 * 1024 * 1024 } // 2GB
 });
 
-// List files
-app.get('/files', (req, res) => {
-  fs.readdir(uploadDir, (err, files) => {
-    if (err) return res.status(500).send('Error reading files');
+// Middlewares
+app.use(express.json());
+app.use(express.static(publicDir));
+
+// Upload endpoint (supports single or multiple files)
+app.post('/upload', upload.array('file', 20), (req, res) => {
+  if (!req.files || req.files.length === 0) {
+    return res.status(400).json({ error: 'No files uploaded' });
+  }
+
+  const now = Date.now();
+  const uploaded = req.files.map(f => ({
+    name: f.filename,
+    size: f.size,
+    sizeFormatted: formatBytes(f.size),
+    expiresAt: new Date(now + FILE_TTL_MS).toISOString(),
+    remainingSeconds: Math.floor(FILE_TTL_MS / 1000)
+  }));
+  res.json({ success: true, files: uploaded });
+});
+
+// List files with metadata, remaining TTL, and on-demand expiration check
+app.get('/files', async (req, res) => {
+  try {
+    const entries = await fs.promises.readdir(uploadDir);
+    const files = [];
+    const now = Date.now();
+
+    for (const name of entries) {
+      if (name.startsWith('.')) continue;
+      const fullPath = path.join(uploadDir, name);
+      try {
+        const stats = await fs.promises.stat(fullPath);
+        if (!stats.isFile()) continue;
+
+        const ageMs = now - stats.mtimeMs;
+        // Immediate purge if expired
+        if (ageMs >= FILE_TTL_MS) {
+          fs.promises.unlink(fullPath).catch(() => {});
+          continue;
+        }
+
+        const remainingMs = Math.max(0, FILE_TTL_MS - ageMs);
+        const remainingSeconds = Math.ceil(remainingMs / 1000);
+
+        files.push({
+          name,
+          size: stats.size,
+          sizeFormatted: formatBytes(stats.size),
+          modifiedAt: stats.mtime,
+          expiresAt: new Date(stats.mtimeMs + FILE_TTL_MS).toISOString(),
+          remainingSeconds
+        });
+      } catch (e) {
+        continue;
+      }
+    }
+
+    // Sort newest first
+    files.sort((a, b) => new Date(b.modifiedAt) - new Date(a.modifiedAt));
     res.json(files);
-  });
+  } catch (err) {
+    res.status(500).json({ error: 'Error reading files' });
+  }
+});
+
+// Download / direct link with on-demand expiration check
+app.get('/uploads/:filename', (req, res) => {
+  const safe = getSafeFilePath(req.params.filename);
+  if (!safe || !fs.existsSync(safe.resolvedPath)) {
+    return res.status(404).send('File not found');
+  }
+
+  try {
+    const stats = fs.statSync(safe.resolvedPath);
+    if ((Date.now() - stats.mtimeMs) >= FILE_TTL_MS) {
+      fs.unlink(safe.resolvedPath, () => {});
+      return res.status(410).send('File expired');
+    }
+  } catch (err) {
+    return res.status(404).send('File not found');
+  }
+
+  res.download(safe.resolvedPath, safe.safeName);
 });
 
 // Delete file
-app.delete('/delete/:filename', (req, res) => {
-  const filePath = path.join(uploadDir, req.params.filename);
-  fs.unlink(filePath, err => {
-    if (err) return res.status(500).send('Error deleting file');
+app.delete('/delete/:filename', async (req, res) => {
+  const safe = getSafeFilePath(req.params.filename);
+  if (!safe) return res.status(400).send('Invalid filename');
+
+  try {
+    await fs.promises.unlink(safe.resolvedPath);
     res.send('File deleted');
-  });
+  } catch (err) {
+    res.status(500).send('Error deleting file');
+  }
 });
 
-// Start server
-app.listen(PORT, () => console.log(`Server running on port ${PORT}`));
+// Start Server with fallback port handling
+function startServer(port, maxAttempts = 10) {
+  const server = app.listen(port, '0.0.0.0', () => {
+    currentPort = port;
+    console.log(`\nkatdrop running on http://localhost:${port}\n`);
+    cleanupExpiredFiles(); // Run initial cleanup on startup
+  });
+
+  server.on('error', (err) => {
+    if (err.code === 'EADDRINUSE' && !process.env.PORT && maxAttempts > 0) {
+      startServer(port + 1, maxAttempts - 1);
+    } else {
+      console.error(`Failed to start server on port ${port}:`, err.message);
+      process.exit(1);
+    }
+  });
+}
+
+startServer(currentPort);
diff --git a/uploads/.gitkeep b/uploads/.gitkeep
new file mode 100644
index 0000000..2b63067
--- /dev/null
+++ b/uploads/.gitkeep
@@ -0,0 +1 @@
+# KatDrop uploads directory