diff --git a/.gitignore b/.gitignore
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index 00000000..ee5373cb
--- /dev/null
+++ b/.gitignore
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+node_modules/
+.DS_Store
+.env
+.vscode/
\ No newline at end of file
diff --git a/Finger Eleven - Paralyzer (Alternate Mix).mp3 b/Finger Eleven - Paralyzer (Alternate Mix).mp3
new file mode 100644
index 00000000..ae3df249
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diff --git a/README.md b/README.md
index 21b3bf44..94cb66ac 100644
--- a/README.md
+++ b/README.md
@@ -1,64 +1,45 @@
-Assignment 4 - Creative Coding: Interactive Multimedia Experiences
-===
-
-For this assignment we will focus on client-side development using popular audio/graphics/visualization technologies. The goal of this assignment is to refine our JavaScript knowledge while exploring the multimedia capabilities of the browser.
-
-- [Three.js Tutorial](https://github.com/jmcuneo/cs4241-guides/blob/master/using.three.md)
-- [WebAudio / Canvas Tutorial](https://github.com/jmcuneo/cs4241-guides/blob/main/using.webaudio_and_canvas.md)  
-- [SVG + D3 tutorial](https://github.com/jmcuneo/cs4241-guides/blob/main/using.svg_and_d3.md)  
-
-Baseline Requirements
----
-
-Your application is required to implement the following functionalities:
-
-- A server created using Express. This server can be as simple as needed.
-- A client-side interactive experience using at least one of the following web technologies frameworks.
-  - [Three.js](https://threejs.org/): A library for 3D graphics / VR experiences
-  - [D3.js](https://d3js.org): A library that is primarily used for interactive data visualizations
-  - [Canvas](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API): A 2D raster drawing API included in all modern browsers
-  - [SVG](https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API): A 2D vector drawing framework that enables shapes to be defined via XML.
-  - [Web Audio API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API): An API for audio synthesis, analysis, processing, and file playback.
-- A user interface for interaction with your project, which must expose at least four parameters for user control. [tweakpane](https://cocopon.github.io/tweakpane/) is highly recommended for this, but you can also use regular HTML `<input>` tags (the `range` type is useful to create sliders). You might also explore interaction by tracking mouse movement via the `window.onmousemove` event handler in tandem with the `event.clientX` and `event.clientY` properties. Consider using the [Pointer Events API](https://developer.mozilla.org/en-US/docs/Web/API/Pointer_events) to ensure that that both mouse and touch events will both be supported in your app.
-- Your application should display basic documentation for the user interface when the application first loads.
-
-The interactive experience should possess a reasonable level of complexity. Some examples:
-### Three.js
-- A generative algorithm creates simple agents that move through a virtual world. Your interface controls the behavior / appearance of these agents.
-- A simple 3D game. You really want this to be a simple as possible or it will be outside the scope of this assignment.
-- An 3D audio visualization of a song of your choosing. User interaction should control aspects of the visualization. 
-### Canvas
-- Implement a generative algorithm such as [Conway's Game of Life](https://bitstorm.org/gameoflife/) (or 1D cellular automata) and provide interactive controls. Note that the Game of Life has been created by 100s of people using `<canvas>`; we'll be checking to ensure that your implementation is not a copy of these.
-- Design a 2D audio visualizer of a song of your choosing. User interaction should control visual aspects of the experience. 
-### Web Audio API
-- Create a screen-based musical instrument using the Web Audio API. You can use projects such as [Interface.js](http://charlie-roberts.com/interface/) or [Nexus UI](https://nexus-js.github.io/ui/api/#Piano) to provide common musical interface elements, or use dat.GUI in combination with mouse/touch events (use the Pointer Events API). Your GUI should enable users to control aspects of sound synthesis. If you want to use higher-level instruments instead of the raw WebAudio API sounds, consider trying the instruments provided by [Tone.js]() or [Gibber](https://github.com/charlieroberts/gibber.audio.lib).
-### D3.js
-- Create visualizations using the datasets found at [Awesome JSON Datasets](https://github.com/jdorfman/Awesome-JSON-Datasets). Experiment with providing different visualizations of the same data set, and providing users interactive control over visualization parameters and/or data filtering. Alternatively, create a single visualization with using one of the more complicated techniques shown at [d3js.org](d3js.org) and provide meaningful points of interaction for users.
-
-Deliverables
----
-
-Do the following to complete this assignment:
-
-1. Implement your project with the above requirements.
-1. Test your project to make sure that when someone goes to your main page on Render, etc., it displays correctly.
-1. Ensure that your project has the proper naming scheme `a4-firstname-lastname` so we can find it.
-1. Fork this repository and modify the README to the specifications below. 
-1. Create and submit a Pull Request to the original repo. Name the pull request using the following template: `a4-firstname-lastname`.
-
-Grading
----
-Unlike previous assignments, this assignment will be solely graded on whether or not you successfully complete it. Partial credit will be generously given.
-
-Sample Readme (delete the above when you're ready to submit, and modify the below so with your links and descriptions)
----
-
-## Your Web Application Title
-
-your hosting link e.g. http://a4-charlieroberts.glitch.me
-
-Include a very brief summary of your project here. Images are encouraged when needed, along with concise, high-level text. Be sure to include the following:
-
-- the goal of the application
-- challenges you faced in realizing the application
-- the instructions you present in the website should be clear enough to use the application, but if you feel any need to provide additional instructions please do so here.
+# A4 - Simple Audio Visualizer
+
+**Deployment** [Audio Visualizer - A4](https://a4-utku-yakar.vercel.app/)
+
+## What this is 
+A tiny Canvas + Web Audio API visualizer with a clean, minimal UI and a bottom player (play/pause/stop + seek bar). You load an audio file and tweak a few sliders to change the look/feel of the bars.
+
+## Why I built it this way
+Goal was to practice client-side multimedia (no frameworks) and keep the UI simple. I stuck to one visual mode (Bars) but gave it enough controls to feel interactive.\
+
+## Challenges I faced
+Getting the Web Audio API connected properly to the canvas took a bit of trial and error, especially figuring out FFT sizes and smoothing so the visuals looked good. I also had to debug file loading and make sure drag-and-drop, the progress bar, and the play/pause controls all stayed in sync.
+
+## Default settings
+- Mode: Bars
+- Bar/Point Count: 150
+- Sensitivity: 1
+- Smoothing: 0.92
+- FFT Size: 2048
+- Colors: Rainbow
+
+## Controls (≥4 exposed parameters)
+- Bar / Point Count (16–512)  
+- Sensitivity (0.5–3)  
+- Smoothing (0–0.98)  
+- FFT Size (512/1024/2048/4096)  
+- Colors (rainbow/mono/cool/warm)  
+- Bottom Player: Play • Pause • Stop • Seek (progress bar) • Time readout
+
+## How to use
+1. Click Load audio (or drag & drop a file anywhere).  
+2. Use the bottom player to Play/Pause/Stop. Drag the progress bar to scrub.  
+3. Adjust Bar/Point Count, Sensitivity, Smoothing, FFT Size, and Colors.  
+4. Tip: Spacebar toggles play/pause. Bigger FFT = more detail, higher smoothing = calmer motion.
+
+## Tech
+- Express server (serves /public, /health route).  
+- Canvas 2D for drawing.  
+- Web Audio API for frequency analysis.
+
+## Run it locally
+```bash
+npm install
+npm run dev
+# open http://localhost:3000
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+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3",
+        "side-channel-map": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/statuses": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "license": "MIT",
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 00000000..f761d6db
--- /dev/null
+++ b/package.json
@@ -0,0 +1,17 @@
+{
+  "name": "a4-creative-coding-visualizer",
+  "version": "1.0.0",
+  "description": "Canvas + WebAPI + Express server",
+  "main": "server.js",
+  "type": "module",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "node server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "express": "^4.19.2"
+  }
+}
diff --git a/public/index.html b/public/index.html
new file mode 100644
index 00000000..69bd368f
--- /dev/null
+++ b/public/index.html
@@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
+  <title>A4 - Simple Audio Visualizer</title>
+  <link rel="stylesheet" href="style.css" />
+</head>
+<body>
+  <header class="topbar">
+    <h1>A4: Simple Audio Visualizer</h1>
+    <div class="controls">
+      <div class="control">
+        <label for="file">Load audio</label>
+        <input type="file" id="file" accept="audio/*"/>
+      </div>
+
+      <div class="control">
+        <label for="bars">Bar / Point Count <span class="sp" id="barsVal">150</span></label>
+        <input type="range" id="bars" min="16" max="512" value="150" />
+      </div>
+
+      <div class="control">
+        <label for="sensitivity">Sensitivity <span class="sp" id="sensVal">1</span></label>
+        <input type="range" id="sensitivity" min="0.5" max="3" step="0.1" value="1" />
+      </div>
+
+      <div class="control">
+        <label for="smoothing">Smoothing <span class="sp" id="smoothVal">0.92</span></label>
+        <input type="range" id="smoothing" min="0" max="0.98" step="0.01" value="0.92" />
+      </div>
+
+      <div class="control">
+        <label for="fft">FFT Size</label>
+        <select id="fft">
+          <option>512</option>
+          <option>1024</option>
+          <option selected>2048</option>
+          <option>4096</option>
+        </select>
+      </div>
+
+      <div class="control">
+        <label for="color">Colors</label>
+        <select id="color">
+          <option value="rainbow" selected>Rainbow</option>
+          <option value="mono">Monochrome</option>
+          <option value="cool">Cool</option>
+          <option value="warm">Warm</option>
+        </select>
+      </div>
+    </div>
+  </header>
+
+  <section class="help">
+    <details open>
+      <summary>How to use (click to toggle)</summary>
+      <ul>
+        <li>Pick a song with <b>Load audio</b>, then use the player at the bottom to <b>Play/Pause/Stop</b> or scrub with the <b>progress bar</b>.</li>
+        <li>Tweak <b>Bar/Point Count</b>, <b>Sensitivity</b>, <b>Smoothing</b>, <b>FFT Size</b>, and <b>Colors</b>.</li>
+        <li>Tip: bigger FFT sizes = more detail, higher smoothing = calmer motion. Spacebar toggles play/pause.</li>
+      </ul>
+    </details>
+  </section>
+
+  <main id="stage-wrap">
+    <canvas id="stage"></canvas>
+    <div id="drop">Drop an audio file to load!</div>
+  </main>
+
+  <!-- bottom player -->
+  <footer class="player">
+    <div class="player-left">
+      <button class="btn" id="play" title="Play">▶</button>
+      <button class="btn" id="pause" title="Pause">⏸</button>
+      <button class="btn" id="stop" title="Stop">⏹</button>
+    </div>
+    <div class="player-mid">
+      <span id="curTime">0:00</span>
+      <input type="range" id="progress" min="0" max="1000" value="0" />
+      <span id="durTime">0:00</span>
+    </div>
+    <div class="player-right">
+      <!-- todo add volume -->
+    </div>
+  </footer>
+
+  <script src="script.js" type="module"></script>
+</body>
+</html>
diff --git a/public/script.js b/public/script.js
new file mode 100644
index 00000000..db9e3e53
--- /dev/null
+++ b/public/script.js
@@ -0,0 +1,232 @@
+const canvas = document.getElementById('stage');
+const ctx = canvas.getContext('2d', { alpha: false });
+const dpr = Math.max(1, window.devicePixelRatio || 1);
+
+function resize() {
+  const rect = canvas.getBoundingClientRect();
+  canvas.width = Math.floor(rect.width * dpr);
+  canvas.height = Math.floor(rect.height * dpr);
+}
+resize();
+addEventListener('resize', resize);
+
+// UI elements
+const fileInput = document.getElementById('file');
+const barsInput = document.getElementById('bars');
+const barsVal = document.getElementById('barsVal');
+const sensInput = document.getElementById('sensitivity');
+const sensVal = document.getElementById('sensVal');
+const smoothingInput = document.getElementById('smoothing');
+const smoothVal = document.getElementById('smoothVal');
+const fftSelect = document.getElementById('fft');
+const colorSelect = document.getElementById('color');
+const playBtn = document.getElementById('play');
+const pauseBtn = document.getElementById('pause');
+const stopBtn = document.getElementById('stop');
+const progress = document.getElementById('progress');
+const curTimeEl = document.getElementById('curTime');
+const durTimeEl = document.getElementById('durTime');
+const drop = document.getElementById('drop');
+
+// UI values I found to work the best, so they are the defaults
+barsVal.textContent = barsInput.value;       // 150
+sensVal.textContent = sensInput.value;       // 1
+smoothVal.textContent = smoothingInput.value; // 0.92
+
+// Audio
+const audio = new Audio();
+audio.crossOrigin = 'anonymous';
+audio.preload = 'auto';
+audio.loop = false;
+
+let audioCtx;
+let analyser;
+let srcNode; 
+let freqData = new Uint8Array(1024); 
+let timeData = new Uint8Array(1024);
+
+function ensureContext() {
+  if (!audioCtx) {
+    audioCtx = new (window.AudioContext || window.webkitAudioContext)();
+    analyser = audioCtx.createAnalyser();
+    analyser.fftSize = parseInt(fftSelect.value, 10);
+    analyser.smoothingTimeConstant = parseFloat(smoothingInput.value); 
+    freqData = new Uint8Array(analyser.frequencyBinCount);
+    timeData = new Uint8Array(analyser.frequencyBinCount);
+  }
+}
+
+function connectGraph() {
+  // wire audio element to the analyser
+  if (srcNode) try { srcNode.disconnect(); } catch {}
+  srcNode = audioCtx.createMediaElementSource(audio);
+  srcNode.connect(analyser);
+  analyser.connect(audioCtx.destination);
+}
+
+function setFFT(size) {
+  analyser.fftSize = size;
+  freqData = new Uint8Array(analyser.frequencyBinCount);
+  timeData = new Uint8Array(analyser.frequencyBinCount);
+}
+
+// load the files
+fileInput.addEventListener('change', async (e) => {
+  const file = e.target.files?.[0];
+  if (file) await loadFile(file);
+});
+
+async function loadFile(file) {
+  if (audio.src && audio.src.startsWith('blob:')) URL.revokeObjectURL(audio.src);
+  const url = URL.createObjectURL(file);
+  audio.src = url;
+  await audio.load();
+  // progress bar
+}
+
+// drag and drop files
+document.addEventListener('dragover', (e) => {
+  e.preventDefault();
+  drop.style.display = 'flex';
+});
+document.addEventListener('dragleave', () => {
+  drop.style.display = 'none';
+});
+document.addEventListener('drop', async (e) => {
+  e.preventDefault();
+  drop.style.display = 'none';
+  const file = e.dataTransfer?.files?.[0];
+  if (file) await loadFile(file);
+});
+
+// song player controls
+playBtn.addEventListener('click', async () => {
+  ensureContext();
+  connectGraph();
+  if (audioCtx.state === 'suspended') await audioCtx.resume();
+  try {
+    await audio.play();
+  } catch (err) {
+    console.error('Play failed:', err);
+  }
+});
+
+pauseBtn.addEventListener('click', () => {
+  audio.pause();
+});
+
+stopBtn.addEventListener('click', () => {
+  audio.pause();
+  audio.currentTime = 0;
+});
+
+// spacebar start stop
+document.addEventListener('keydown', (e) => {
+  if (e.code === 'Space') {
+    e.preventDefault();
+    if (audio.paused) playBtn.click();
+    else pauseBtn.click();
+  }
+});
+
+// Progress bar and duration
+function fmtTime(sec) {
+  if (!isFinite(sec)) return '0:00';
+  const m = Math.floor(sec / 60);
+  const s = Math.floor(sec % 60);
+  return `${m}:${s.toString().padStart(2, '0')}`;
+}
+audio.addEventListener('loadedmetadata', () => {
+  durTimeEl.textContent = fmtTime(audio.duration);
+});
+
+// update progress bar as audio plays
+audio.addEventListener('timeupdate', () => {
+  const d = audio.duration || 0;
+  const t = audio.currentTime || 0;
+  curTimeEl.textContent = fmtTime(t);
+  durTimeEl.textContent = fmtTime(d);
+  const val = d ? Math.floor((t / d) * 1000) : 0;
+  if (!progressDragging) progress.value = val;
+});
+
+let progressDragging = false;
+
+progress.addEventListener('input', () => {
+  progressDragging = true;
+});
+
+// when done dragging, go to that spot
+progress.addEventListener('change', () => {
+  const d = audio.duration || 0;
+  const ratio = parseInt(progress.value, 10) / 1000;
+  audio.currentTime = d * ratio;
+  progressDragging = false;
+});
+
+audio.addEventListener('ended', () => {
+  progress.value = 0;
+  curTimeEl.textContent = '0:00';
+});
+
+// parameters
+barsInput.addEventListener('input', () => (barsVal.textContent = barsInput.value));
+sensInput.addEventListener('input', () => (sensVal.textContent = sensInput.value));
+smoothingInput.addEventListener('input', () => {
+  smoothVal.textContent = smoothingInput.value;
+  if (analyser) analyser.smoothingTimeConstant = parseFloat(smoothingInput.value);
+});
+fftSelect.addEventListener('change', () => {
+  if (analyser) setFFT(parseInt(fftSelect.value, 10));
+});
+
+// colors
+function hsl(h, s, l) {
+  return `hsl(${h}deg ${s}% ${l}%)`;
+}
+
+function colorFor(index, total) {
+  const scheme = colorSelect.value; 
+  if (scheme === 'mono') return hsl(200, 10, 85);
+  if (scheme === 'cool') return hsl(200 + (index / total) * 40, 80, 60);
+  if (scheme === 'warm') return hsl(10 + (index / total) * 40, 85, 60);
+  const hue = (index / total) * 300; 
+  return hsl(hue, 85, 60);
+}
+
+// drawing the bars
+function drawBars() {
+  const w = canvas.width;
+  const h = canvas.height;
+  const count = parseInt(barsInput.value, 10);
+  const spacing = 1.2;
+  const barW = Math.max(1, Math.floor((w / count) / spacing));
+  const maxBarH = h * 0.92;
+  const gain = parseFloat(sensInput.value);
+
+  // background
+  ctx.fillStyle = '#0b0f14';
+  ctx.fillRect(0, 0, w, h);
+
+  const step = Math.max(1, Math.floor(freqData.length / count));
+
+  for (let i = 0; i < count; i++) {
+    const v = freqData[i * step] / 255;
+    const bh = Math.min(maxBarH, Math.pow(v * gain, 1.08) * maxBarH);
+    const x = Math.floor(i * (w / count));
+    const y = h - bh;
+
+    ctx.fillStyle = colorFor(i, count);
+    ctx.fillRect(x, y, barW, bh);
+  }
+}
+
+// animation loop
+function tick() {
+  requestAnimationFrame(tick);
+  if (!analyser) return;
+
+  analyser.getByteFrequencyData(freqData);
+  drawBars();
+}
+tick();
diff --git a/public/style.css b/public/style.css
new file mode 100644
index 00000000..5d40b274
--- /dev/null
+++ b/public/style.css
@@ -0,0 +1,124 @@
+:root {
+  --bg: #0b0f14;
+  --panel: #111826;
+  --panel-2: #0e1522;
+  --text: #e7edf4;
+  --muted: #98a3ad;
+  --accent: #5ee3ff;
+  --border: #1f2a3a;
+}
+
+* { box-sizing: border-box; }
+html, body { height: 100%; }
+body {
+  margin: 0;
+  color: var(--text);
+  background: var(--bg);
+  font-family: system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
+  display: grid;
+  grid-template-rows: auto auto 1fr auto; 
+}
+
+/* top part */
+.topbar {
+  padding: 12px 16px;
+  background: linear-gradient(180deg, #0f1520, #0b0f14);
+  border-bottom: 1px solid var(--border);
+  display: flex;
+  gap: 12px;
+  align-items: center;
+  flex-wrap: wrap;
+}
+.topbar h1 {
+  font-size: 16px;
+  margin: 0 12px 0 0;
+  font-weight: 600;
+  color: var(--accent);
+}
+.controls {
+  display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
+}
+.control {
+  background: var(--panel);
+  border: 1px solid var(--border);
+  padding: 8px 10px;
+  border-radius: 12px;
+  display: grid;
+  gap: 6px;
+}
+.control label { font-size: 12px; color: var(--muted); }
+.control input[type="range"] { width: 180px; }
+.control select, .control input[type="range"] { accent-color: var(--accent); }
+
+.help {
+  background: var(--panel-2);
+  border-top: 1px solid var(--border);
+  border-bottom: 1px solid var(--border);
+  padding: 10px 16px;
+}
+.help details {
+  background: var(--panel);
+  border: 1px solid var(--border);
+  border-radius: 12px;
+  padding: 10px 12px;
+}
+.help summary { cursor: pointer; color: var(--accent); }
+
+#stage-wrap { position: relative; height: 100%; min-height: 0; }
+canvas { width: 100%; height: 100%; display: block; }
+
+/* file drop */
+#drop {
+  position: absolute; inset: 0; display: none;
+  border: 2px dashed #3b495c; border-radius: 16px;
+  background: rgba(20, 28, 38, 0.6);
+  align-items: center; justify-content: center;
+  color: var(--muted); font-size: 18px;
+  pointer-events: none;
+}
+
+/* player bar */
+.player {
+  display: grid;
+  grid-template-columns: auto 1fr auto;
+  align-items: center;
+  gap: 12px;
+  padding: 10px 12px;
+  border-top: 1px solid var(--border);
+  background: rgba(10, 15, 22, 0.85);
+  backdrop-filter: blur(6px);
+  position: sticky;
+  bottom: 0;
+}
+
+.player-left, .player-right {
+  display: flex; align-items: center; gap: 8px;
+}
+
+.player-mid {
+  display: grid;
+  grid-template-columns: auto 1fr auto;
+  gap: 10px;
+  align-items: center;
+}
+
+#progress {
+  width: 100%;
+  accent-color: var(--accent);
+}
+
+.btn {
+  background: #1a2330;
+  color: var(--text);
+  border: 1px solid var(--border);
+  border-radius: 10px;
+  padding: 8px 12px;
+  cursor: pointer;
+}
+.btn:hover { background: #212d3d; }
+
+.sp { color: #8894a0; }
+
+@media (max-width: 700px) {
+  .control input[type="range"] { width: 130px; }
+}
diff --git a/server.js b/server.js
new file mode 100644
index 00000000..d7d005ab
--- /dev/null
+++ b/server.js
@@ -0,0 +1,20 @@
+// express sv
+import express from 'express';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+// stat host
+app.use(express.static(path.join(__dirname, 'public')));
+
+// health check again, otherwise render gets mad
+app.get('/health', (_req, res) => res.status(200).send('ok'));
+
+app.listen(PORT, () => {
+  console.log(`Server listening on http://localhost:${PORT}`);
+});