add WebGL scenes to all themes, sounds, image sizing, new themes

- All 11 themes now have unique Three.js WebGL backgrounds:
  aurora: flowing sine-wave ribbon meshes with additive blending
  brutalist: harsh rotating white/red wireframe boxes
  glass: drifting crystal icosahedron shards, semi-transparent
  matrix: digital rain particle columns with per-vertex colour fade
  ocean: animated vertex-displaced wave surface with orbiting light
  retro: amber demo-scene cube with orbiting octahedrons
  synthwave: sunset sphere with scan-line rings and perspective grid
  terminal: green icosahedron wireframe with orbiting torus particles
  neon: existing Three.js orb and rings (unchanged)
  plasma (replaces minimal): drifting additive-blend colour blobs
  volcano (replaces paper): rising ember particles with lifecycle

- shared.go: distinct sounds for j/k nav (220Hz beep), Enter (ascending
  triangle chime), and Esc (descending sine sweep)
- shared.go: images are now thumbnails (max-height:220px) in list view
  and expand to full width inside the modal (CSS override in navmodal)
- main.go: --list-themes flag prints all theme names and exits;
  --theme random picks a random theme at all generation time
- themes.go: updated registry with plasma/volcano replacing minimal/paper

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

12 files changed, 1006 insertions, 191 deletions

diff --git a/internal/generator/shared.go b/internal/generator/shared.go
index eed4de3..12a91f4 100644
--- a/internal/generator/shared.go
+++ b/internal/generator/shared.go
@@ -3,13 +3,12 @@ package generator
 // navDefs is appended to every theme template when parsing.
 // It defines three named sub-templates shared across all themes:
 //   - "navhints"  — keyboard shortcut hint bar HTML
-//   - "navmodal"  — full-screen expanded-post modal HTML
-//   - "navscript" — keyboard navigation JavaScript
+//   - "navmodal"  — full-screen expanded-post modal HTML + image-sizing CSS
+//   - "navscript" — keyboard navigation JavaScript with distinct sounds per action
 //
 // Each theme calls {{template "navhints" .}}, {{template "navmodal" .}}, and
 // {{template "navscript" .}} at the appropriate points in its HTML.
-// All CSS for these elements (colours, borders, backdrop) lives in each theme
-// so themes remain self-contained and independently styled.
+// All theme-specific CSS lives in each theme file so themes stay self-contained.
 const navDefs = `
 {{define "navhints"}}
 <div class="nav-hints" aria-label="keyboard shortcuts">
@@ -21,6 +20,12 @@ const navDefs = `
 {{end}}
 
 {{define "navmodal"}}
+<style>
+/* Thumbnail sizing in list view; modal overrides to full width so images
+   appear larger when a post is expanded with Enter. */
+.post-image { max-height:220px; max-width:100%; object-fit:cover; cursor:pointer; }
+#post-modal .post-image { max-height:none; width:100%; max-width:100%; object-fit:contain; cursor:default; }
+</style>
 <div class="post-modal" id="post-modal">
     <div class="modal-inner">
         <button class="modal-close" onclick="closeModal()">[ ESC ] CLOSE</button>
@@ -51,8 +56,7 @@ const navDefs = `
         playNavSound();
     }
 
-    // playNavSound generates a short beep via the Web Audio API.
-    // A fresh AudioContext per call avoids state issues across navigations.
+    // playNavSound: short low beep for post selection (j/k navigation).
     function playNavSound() {
         try {
             const ctx = new (window.AudioContext || window.webkitAudioContext)();
@@ -60,21 +64,55 @@ const navDefs = `
             const gain = ctx.createGain();
             osc.connect(gain); gain.connect(ctx.destination);
             osc.frequency.value = 220; osc.type = 'sine';
-            gain.gain.setValueAtTime(0.15, ctx.currentTime);
+            gain.gain.setValueAtTime(0.12, ctx.currentTime);
             gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.08);
             osc.start(ctx.currentTime); osc.stop(ctx.currentTime + 0.08);
         } catch (_) {}
     }
 
+    // playOpenSound: bright ascending chime when modal opens (Enter key).
+    function playOpenSound() {
+        try {
+            const ctx = new (window.AudioContext || window.webkitAudioContext)();
+            const osc = ctx.createOscillator();
+            const gain = ctx.createGain();
+            osc.connect(gain); gain.connect(ctx.destination);
+            osc.type = 'triangle';
+            osc.frequency.setValueAtTime(440, ctx.currentTime);
+            osc.frequency.exponentialRampToValueAtTime(880, ctx.currentTime + 0.14);
+            gain.gain.setValueAtTime(0.10, ctx.currentTime);
+            gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.20);
+            osc.start(ctx.currentTime); osc.stop(ctx.currentTime + 0.20);
+        } catch (_) {}
+    }
+
+    // playCloseSound: descending sweep when modal closes (Esc key).
+    function playCloseSound() {
+        try {
+            const ctx = new (window.AudioContext || window.webkitAudioContext)();
+            const osc = ctx.createOscillator();
+            const gain = ctx.createGain();
+            osc.connect(gain); gain.connect(ctx.destination);
+            osc.type = 'sine';
+            osc.frequency.setValueAtTime(440, ctx.currentTime);
+            osc.frequency.exponentialRampToValueAtTime(110, ctx.currentTime + 0.15);
+            gain.gain.setValueAtTime(0.10, ctx.currentTime);
+            gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.18);
+            osc.start(ctx.currentTime); osc.stop(ctx.currentTime + 0.18);
+        } catch (_) {}
+    }
+
     function openModal() {
         if (currentIndex < 0) return;
         document.getElementById('modal-content').innerHTML =
             posts[currentIndex].querySelector('.post-text').innerHTML;
         document.getElementById('post-modal').classList.add('active');
+        playOpenSound();
     }
 
     function closeModal() {
         document.getElementById('post-modal').classList.remove('active');
+        playCloseSound();
     }
 
     document.addEventListener('keydown', function(e) {
diff --git a/internal/generator/theme_aurora.go b/internal/generator/theme_aurora.go
index 9475320..4fa85f6 100644
--- a/internal/generator/theme_aurora.go
+++ b/internal/generator/theme_aurora.go
@@ -1,32 +1,21 @@
 package generator
 
-// auroraTemplate is a dark navy theme with a CSS-animated aurora borealis
-// effect — shifting green/purple/teal gradients across the background sky.
+// auroraTemplate is a dark navy theme with a WebGL aurora borealis effect —
+// six wide ribbon meshes whose vertices are animated with overlapping sine waves,
+// rendered with additive blending to create the characteristic glow.
 const auroraTemplate = `<!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>snonux.foo ✦ AURORA</title>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r134/three.min.js"></script>
     <style>
         :root { --green:#00ffb3; --teal:#00cfe8; --purple:#c084fc; --navy:#050d1a; }
         * { margin:0; padding:0; box-sizing:border-box; }
         body { font-family:'Segoe UI',system-ui,sans-serif; background:var(--navy);
                color:#e0f8f0; overflow:hidden; height:100vh; }
-        /* Animated aurora bands */
-        @keyframes aurora1 { 0%,100%{opacity:0.18;transform:scaleX(1) translateY(0)} 50%{opacity:0.28;transform:scaleX(1.15) translateY(-14px)} }
-        @keyframes aurora2 { 0%,100%{opacity:0.12;transform:scaleX(1) translateY(0)} 50%{opacity:0.22;transform:scaleX(0.88) translateY(10px)} }
-        @keyframes aurora3 { 0%,100%{opacity:0.10;transform:scaleX(1) skewY(0deg)} 50%{opacity:0.18;transform:scaleX(1.08) skewY(2deg)} }
-        .aurora-bg { position:fixed; inset:0; z-index:0; overflow:hidden; }
-        .aurora-bg::before { content:''; position:absolute; left:-20%; top:5%; width:140%; height:45%;
-            background:radial-gradient(ellipse,rgba(0,255,179,0.38) 0%,rgba(0,207,232,0.22) 40%,transparent 70%);
-            filter:blur(40px); animation:aurora1 12s ease-in-out infinite; }
-        .aurora-bg::after { content:''; position:absolute; left:10%; top:20%; width:120%; height:55%;
-            background:radial-gradient(ellipse,rgba(192,132,252,0.28) 0%,rgba(0,255,179,0.18) 45%,transparent 70%);
-            filter:blur(50px); animation:aurora2 16s ease-in-out infinite; }
-        .aurora-band3 { position:fixed; left:-10%; top:35%; width:130%; height:40%; z-index:0;
-            background:radial-gradient(ellipse,rgba(0,207,232,0.22) 0%,rgba(192,132,252,0.14) 50%,transparent 75%);
-            filter:blur(45px); animation:aurora3 20s ease-in-out infinite; }
+        #three-canvas { position:fixed; top:0; left:0; width:100%; height:100%; z-index:1; }
         .overlay { position:relative; z-index:10; height:100vh; display:flex; flex-direction:column; }
         header { padding:16px 28px; background:rgba(5,13,26,0.78); backdrop-filter:blur(14px);
                  border-bottom:1px solid rgba(0,255,179,0.25); display:flex; align-items:center; justify-content:space-between; }
@@ -38,8 +27,7 @@ const auroraTemplate = `<!DOCTYPE html>
         .logo-title .subtitle a { color:var(--green); text-decoration:none; }
         .logo-title .subtitle a:hover { text-shadow:0 0 8px var(--green); }
         .transmit-btn { border:1px solid var(--teal); color:var(--teal); padding:9px 20px;
-                        border-radius:20px; text-decoration:none; font-size:0.85rem;
-                        transition:all 0.2s; }
+                        border-radius:20px; text-decoration:none; font-size:0.85rem; transition:all 0.2s; }
         .transmit-btn:hover { background:var(--teal); color:var(--navy); }
         .nav-hints { background:rgba(5,13,26,0.6); border-bottom:1px solid rgba(0,255,179,0.15);
                      color:rgba(224,248,240,0.45); padding:5px 28px; display:flex; gap:18px;
@@ -63,7 +51,6 @@ const auroraTemplate = `<!DOCTYPE html>
         .post-text { line-height:1.65; font-size:0.95rem; }
         .post-text a { color:var(--green); text-decoration:none; }
         .post-text a:hover { text-shadow:0 0 8px var(--green); }
-        .post-image { max-width:100%; border-radius:8px; margin-top:10px; }
         .post-audio { width:100%; margin-top:10px; }
         .post-modal { display:none; position:fixed; inset:0; z-index:100;
                       background:rgba(5,13,26,0.95); backdrop-filter:blur(20px);
@@ -78,8 +65,7 @@ const auroraTemplate = `<!DOCTYPE html>
     </style>
 </head>
 <body>
-    <div class="aurora-bg"></div>
-    <div class="aurora-band3"></div>
+    <canvas id="three-canvas"></canvas>
     <div class="overlay">
         <header>
             <div class="logo">
@@ -109,6 +95,87 @@ const auroraTemplate = `<!DOCTYPE html>
         </div>
     </div>
     {{template "navmodal" .}}
+    <script>
+    // Aurora WebGL: six wide ribbon meshes whose top-row vertices are animated
+    // with overlapping sine waves, rendered with additive blending so they glow
+    // against the dark navy sky like real aurora curtains.
+    (function() {
+        var RIBBON_COUNT = 6;
+        var SEG_W = 60; // horizontal segments per ribbon
+        var ribbonColors = [0x00ffb3, 0x00cfe8, 0xc084fc, 0x00ffb3, 0x48e8d0, 0xa855f7];
+        var ribbonY     = [-10, -4, 2, 8, 14, 20];
+        var ribbonZ     = [-40, -30, -22, -15, -10, -5];
+        var ribbonFreq  = [0.6, 0.9, 0.7, 1.1, 0.5, 0.8];
+        var ribbonPhase = [0.0, 1.2, 2.4, 0.8, 3.1, 1.7];
+        var ribbonAmp   = [3.0, 2.5, 2.0, 3.5, 2.2, 2.8];
+
+        var scene, camera, renderer, clock;
+        var ribbons = [];
+
+        function initThree() {
+            scene = new THREE.Scene();
+            scene.background = new THREE.Color(0x050d1a);
+            scene.fog = new THREE.Fog(0x050d1a, 40, 120);
+
+            camera = new THREE.PerspectiveCamera(60, window.innerWidth/window.innerHeight, 0.1, 200);
+            camera.position.set(0, 5, 30);
+            camera.lookAt(0, 5, 0);
+
+            renderer = new THREE.WebGLRenderer({ canvas: document.getElementById('three-canvas'), antialias: true });
+            renderer.setSize(window.innerWidth, window.innerHeight);
+            renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+
+            clock = new THREE.Clock();
+
+            for (var r = 0; r < RIBBON_COUNT; r++) {
+                // Wide shallow plane; we animate the top row of vertices
+                var geo = new THREE.PlaneGeometry(120, 8, SEG_W, 1);
+                var mat = new THREE.MeshBasicMaterial({
+                    color: ribbonColors[r], transparent: true, opacity: 0.32,
+                    side: THREE.DoubleSide, blending: THREE.AdditiveBlending, depthWrite: false
+                });
+                var mesh = new THREE.Mesh(geo, mat);
+                mesh.position.set(0, ribbonY[r], ribbonZ[r]);
+                scene.add(mesh);
+                ribbons.push({ mesh: mesh, geo: geo, freq: ribbonFreq[r],
+                               phase: ribbonPhase[r], amp: ribbonAmp[r] });
+            }
+
+            window.addEventListener('resize', onResize);
+            animate();
+        }
+
+        function onResize() {
+            camera.aspect = window.innerWidth / window.innerHeight;
+            camera.updateProjectionMatrix();
+            renderer.setSize(window.innerWidth, window.innerHeight);
+        }
+
+        function animate() {
+            requestAnimationFrame(animate);
+            var t = clock.getElapsedTime();
+
+            for (var r = 0; r < ribbons.length; r++) {
+                var rb = ribbons[r];
+                var pos = rb.geo.attributes.position;
+                var count = pos.count;
+                // PlaneGeometry vertices: (SEG_W+1)*2 total; top row is every other vertex
+                for (var i = 0; i < count; i++) {
+                    var x = pos.getX(i);
+                    // Only animate top row (y > 0 in local space) for the waving top edge
+                    if (pos.getY(i) > 0) {
+                        pos.setY(i, rb.amp * Math.sin(t * rb.freq + x * 0.08 + rb.phase)
+                                    + rb.amp * 0.4 * Math.cos(t * rb.freq * 0.7 + x * 0.05));
+                    }
+                }
+                pos.needsUpdate = true;
+            }
+            renderer.render(scene, camera);
+        }
+
+        initThree();
+    })();
+    </script>
     {{template "navscript" .}}
 </body>
 </html>`
diff --git a/internal/generator/theme_brutalist.go b/internal/generator/theme_brutalist.go
index 214c103..aa0729d 100644
--- a/internal/generator/theme_brutalist.go
+++ b/internal/generator/theme_brutalist.go
@@ -1,19 +1,22 @@
 package generator
 
 // brutalistTemplate is a raw brutalist theme — pure black, thick white borders,
-// Impact font, red as the only accent. No rounded corners anywhere.
+// Impact font, red as the only accent. WebGL scene: harsh slowly-rotating boxes,
+// wireframe red and solid white, no fog — brutal clarity.
 const brutalistTemplate = `<!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>SNONUX.FOO</title>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r134/three.min.js"></script>
     <style>
         :root { --red:#ff2200; }
         * { margin:0; padding:0; box-sizing:border-box; }
         body { font-family:Impact,'Arial Narrow',Arial,sans-serif;
                background:#000; color:#fff; overflow:hidden; height:100vh; }
-        .overlay { height:100vh; display:flex; flex-direction:column; }
+        #three-canvas { position:fixed; top:0; left:0; width:100%; height:100%; z-index:1; }
+        .overlay { height:100vh; display:flex; flex-direction:column; position:relative; z-index:10; }
         header { padding:14px 24px; background:#000; border-bottom:4px solid #fff;
                  display:flex; align-items:center; justify-content:space-between; }
         .logo { display:flex; align-items:center; gap:16px; }
@@ -49,7 +52,6 @@ const brutalistTemplate = `<!DOCTYPE html>
         .post-time { color:#aaa; font-family:'Courier New',monospace; font-size:0.82rem; }
         .post-text { font-family:'Arial',sans-serif; font-size:1rem; line-height:1.5; }
         .post-text a { color:var(--red); text-decoration:underline; }
-        .post-image { max-width:100%; margin-top:10px; border:3px solid #fff; }
         .post-audio { width:100%; margin-top:10px; }
         .post-modal { display:none; position:fixed; inset:0; z-index:100;
                       background:rgba(0,0,0,0.98); overflow-y:auto; padding:40px 20px; }
@@ -63,6 +65,7 @@ const brutalistTemplate = `<!DOCTYPE html>
     </style>
 </head>
 <body>
+    <canvas id="three-canvas"></canvas>
     <div class="overlay">
         <header>
             <div class="logo">
@@ -92,6 +95,65 @@ const brutalistTemplate = `<!DOCTYPE html>
         </div>
     </div>
     {{template "navmodal" .}}
+    <script>
+    // Brutalist WebGL: harsh slowly-rotating boxes — solid white and wireframe red.
+    // No fog, no softness. Pure geometric violence against the black void.
+    (function() {
+        var scene, camera, renderer, clock;
+        var boxes = [];
+
+        function initThree() {
+            scene = new THREE.Scene();
+            scene.background = new THREE.Color(0x000000);
+
+            camera = new THREE.PerspectiveCamera(60, window.innerWidth/window.innerHeight, 0.1, 200);
+            camera.position.set(0, 0, 40);
+
+            renderer = new THREE.WebGLRenderer({ canvas: document.getElementById('three-canvas'), antialias: false });
+            renderer.setSize(window.innerWidth, window.innerHeight);
+            renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+            clock = new THREE.Clock();
+
+            // Box configurations: [size, posX, posY, posZ, rotSpeedX, rotSpeedY, wireframe, color]
+            var configs = [
+                [10, 0,   0,  0,   0.002, 0.005, false, 0xffffff],
+                [6,  18, -6,  -8,  0.004, 0.003, true,  0xff2200],
+                [7,  -16, 5, -10,  0.003, 0.006, true,  0xff2200],
+                [5,  8,  12, -5,   0.006, 0.002, false, 0xff2200],
+                [4,  -10,-10, -3,  0.005, 0.004, false, 0xffffff],
+            ];
+
+            configs.forEach(function(c) {
+                var geo = new THREE.BoxGeometry(c[0], c[0], c[0]);
+                var mat = new THREE.MeshBasicMaterial({ color: c[7], wireframe: c[6] });
+                var mesh = new THREE.Mesh(geo, mat);
+                mesh.position.set(c[1], c[2], c[3]);
+                boxes.push({ mesh: mesh, rx: c[4], ry: c[5] });
+                scene.add(mesh);
+            });
+
+            window.addEventListener('resize', onResize);
+            animate();
+        }
+
+        function onResize() {
+            camera.aspect = window.innerWidth / window.innerHeight;
+            camera.updateProjectionMatrix();
+            renderer.setSize(window.innerWidth, window.innerHeight);
+        }
+
+        function animate() {
+            requestAnimationFrame(animate);
+            boxes.forEach(function(b) {
+                b.mesh.rotation.x += b.rx;
+                b.mesh.rotation.y += b.ry;
+            });
+            renderer.render(scene, camera);
+        }
+
+        initThree();
+    })();
+    </script>
     {{template "navscript" .}}
 </body>
 </html>`
diff --git a/internal/generator/theme_glass.go b/internal/generator/theme_glass.go
index 520f9b0..598a2f3 100644
--- a/internal/generator/theme_glass.go
+++ b/internal/generator/theme_glass.go
@@ -1,30 +1,21 @@
 package generator
 
-// glassTemplate is a glassmorphism theme — semi-transparent frosted panels
-// using backdrop-filter:blur over a blurred gradient background.
-// Light mode with subtle purple/blue gradient blobs and white glass cards.
+// glassTemplate is a glassmorphism theme — semi-transparent frosted panels over
+// a WebGL background of slowly drifting crystal icosahedron shards.
+// CSS gradient blobs are replaced by the WebGL scene.
 const glassTemplate = `<!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>snonux.foo · glass</title>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r134/three.min.js"></script>
     <style>
         :root { --blue:#6366f1; --purple:#a855f7; --pink:#ec4899; --text:#1e1b4b; }
         * { margin:0; padding:0; box-sizing:border-box; }
         body { font-family:'Segoe UI',system-ui,sans-serif; overflow:hidden; height:100vh;
                background:#f0f4ff; color:var(--text); }
-        /* Blurred gradient blobs that sit behind all glass panels */
-        .bg-blobs { position:fixed; inset:0; z-index:0; overflow:hidden; }
-        .bg-blobs::before { content:''; position:absolute; top:-20%; left:-10%; width:60%; height:70%;
-            border-radius:50%; background:radial-gradient(circle,rgba(99,102,241,0.35),rgba(168,85,247,0.2),transparent 70%);
-            filter:blur(60px); }
-        .bg-blobs::after { content:''; position:absolute; bottom:-10%; right:-10%; width:65%; height:65%;
-            border-radius:50%; background:radial-gradient(circle,rgba(236,72,153,0.28),rgba(99,102,241,0.18),transparent 70%);
-            filter:blur(70px); }
-        .blob3 { position:fixed; top:40%; left:30%; width:40%; height:50%; z-index:0;
-            border-radius:60% 40% 70% 30%; background:radial-gradient(circle,rgba(168,85,247,0.18),transparent 65%);
-            filter:blur(50px); }
+        #three-canvas { position:fixed; top:0; left:0; width:100%; height:100%; z-index:1; }
         .overlay { position:relative; z-index:10; height:100vh; display:flex; flex-direction:column; }
         header { padding:16px 28px; background:rgba(255,255,255,0.55); backdrop-filter:blur(20px);
                  border-bottom:1px solid rgba(255,255,255,0.6); display:flex; align-items:center; justify-content:space-between;
@@ -39,8 +30,7 @@ const glassTemplate = `<!DOCTYPE html>
         .logo-title .subtitle a:hover { text-decoration:underline; }
         .transmit-btn { border:1px solid rgba(99,102,241,0.4); color:var(--blue); padding:9px 20px;
                         border-radius:20px; text-decoration:none; font-size:0.85rem;
-                        background:rgba(255,255,255,0.5); backdrop-filter:blur(8px);
-                        transition:all 0.2s; }
+                        background:rgba(255,255,255,0.5); backdrop-filter:blur(8px); transition:all 0.2s; }
         .transmit-btn:hover { background:var(--blue); color:#fff; border-color:var(--blue); }
         .nav-hints { background:rgba(255,255,255,0.35); backdrop-filter:blur(10px);
                      border-bottom:1px solid rgba(255,255,255,0.5); color:#6b7280;
@@ -54,16 +44,12 @@ const glassTemplate = `<!DOCTYPE html>
                       border-radius:20px; text-decoration:none; font-size:0.82rem;
                       background:rgba(255,255,255,0.45); backdrop-filter:blur(8px); }
         .page-nav a:hover { background:var(--blue); color:#fff; }
-        /* Glass card */
         .post { background:rgba(255,255,255,0.45); backdrop-filter:blur(18px);
                 border:1px solid rgba(255,255,255,0.6); border-radius:14px;
                 padding:22px; margin-bottom:14px; cursor:pointer;
-                box-shadow:0 4px 20px rgba(99,102,241,0.08);
-                transition:all 0.25s; }
-        .post:hover { background:rgba(255,255,255,0.6); box-shadow:0 8px 30px rgba(99,102,241,0.18);
-                      transform:translateY(-2px); }
-        .post-active { border-color:var(--blue) !important;
-                       background:rgba(238,240,255,0.75) !important;
+                box-shadow:0 4px 20px rgba(99,102,241,0.08); transition:all 0.25s; }
+        .post:hover { background:rgba(255,255,255,0.6); box-shadow:0 8px 30px rgba(99,102,241,0.18); transform:translateY(-2px); }
+        .post-active { border-color:var(--blue) !important; background:rgba(238,240,255,0.75) !important;
                        box-shadow:0 0 0 2px rgba(99,102,241,0.3),0 8px 30px rgba(99,102,241,0.2),
                                   inset 3px 0 0 var(--blue) !important; }
         .post-header { display:flex; justify-content:space-between; margin-bottom:12px; font-size:0.88rem; }
@@ -71,8 +57,6 @@ const glassTemplate = `<!DOCTYPE html>
         .post-text { line-height:1.65; font-size:0.95rem; }
         .post-text a { color:var(--blue); text-decoration:none; }
         .post-text a:hover { text-decoration:underline; }
-        .post-image { max-width:100%; border-radius:10px; margin-top:10px;
-                      border:1px solid rgba(255,255,255,0.5); }
         .post-audio { width:100%; margin-top:10px; }
         .post-modal { display:none; position:fixed; inset:0; z-index:100;
                       background:rgba(240,244,255,0.85); backdrop-filter:blur(28px);
@@ -87,8 +71,7 @@ const glassTemplate = `<!DOCTYPE html>
     </style>
 </head>
 <body>
-    <div class="bg-blobs"></div>
-    <div class="blob3"></div>
+    <canvas id="three-canvas"></canvas>
     <div class="overlay">
         <header>
             <div class="logo">
@@ -118,6 +101,83 @@ const glassTemplate = `<!DOCTYPE html>
         </div>
     </div>
     {{template "navmodal" .}}
+    <script>
+    // Glass WebGL: 8 crystal icosahedron shards, each rendered as a semi-transparent
+    // solid mesh with a wireframe overlay, drifting and rotating slowly in the light bg.
+    // alpha:true so the light body background (#f0f4ff) shows through the canvas.
+    (function() {
+        var scene, camera, renderer, clock;
+        var shards = [];
+
+        function initThree() {
+            scene = new THREE.Scene();
+
+            camera = new THREE.PerspectiveCamera(60, window.innerWidth/window.innerHeight, 0.1, 200);
+            camera.position.set(0, 0, 40);
+
+            renderer = new THREE.WebGLRenderer({
+                canvas: document.getElementById('three-canvas'),
+                antialias: true, alpha: true
+            });
+            renderer.setSize(window.innerWidth, window.innerHeight);
+            renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+            renderer.setClearColor(0xf0f4ff, 1);
+            clock = new THREE.Clock();
+
+            scene.add(new THREE.AmbientLight(0xffffff, 0.8));
+            var pl = new THREE.PointLight(0x7c3aed, 2, 80);
+            pl.position.set(10, 10, 10);
+            scene.add(pl);
+
+            var colors  = [0x6366f1, 0xa855f7, 0xec4899, 0x6366f1, 0x818cf8, 0xc084fc, 0xf472b6, 0x6366f1];
+            var sizes   = [5, 3.5, 2.5, 4, 3, 2, 4.5, 2.2];
+            var details = [2, 1, 0, 2, 1, 0, 1, 2];
+            var positions = [
+                [-12, 6,-8], [14,-4,-12], [0,12,-6], [-8,-10,-15],
+                [16, 8,-4], [-14,2,-10], [6,-8,-5], [-4,10,-14]
+            ];
+
+            for (var i = 0; i < 8; i++) {
+                var geo = new THREE.IcosahedronGeometry(sizes[i], details[i]);
+                var solid = new THREE.Mesh(geo, new THREE.MeshPhongMaterial({
+                    color: colors[i], transparent: true, opacity: 0.12, side: THREE.DoubleSide
+                }));
+                var wire = new THREE.Mesh(geo, new THREE.MeshBasicMaterial({
+                    color: colors[i], wireframe: true, transparent: true, opacity: 0.28
+                }));
+                solid.position.set(positions[i][0], positions[i][1], positions[i][2]);
+                wire.position.copy(solid.position);
+
+                var rx = (Math.random() - 0.5) * 0.004;
+                var ry = (Math.random() - 0.5) * 0.006;
+                var rz = (Math.random() - 0.5) * 0.003;
+                shards.push({ solid: solid, wire: wire, rx: rx, ry: ry, rz: rz });
+                scene.add(solid);
+                scene.add(wire);
+            }
+
+            window.addEventListener('resize', onResize);
+            animate();
+        }
+
+        function onResize() {
+            camera.aspect = window.innerWidth / window.innerHeight;
+            camera.updateProjectionMatrix();
+            renderer.setSize(window.innerWidth, window.innerHeight);
+        }
+
+        function animate() {
+            requestAnimationFrame(animate);
+            shards.forEach(function(s) {
+                s.solid.rotation.x += s.rx; s.solid.rotation.y += s.ry; s.solid.rotation.z += s.rz;
+                s.wire.rotation.copy(s.solid.rotation);
+            });
+            renderer.render(scene, camera);
+        }
+
+        initThree();
+    })();
+    </script>
     {{template "navscript" .}}
 </body>
 </html>`
diff --git a/internal/generator/theme_matrix.go b/internal/generator/theme_matrix.go
index 6d8b531..8d35d7c 100644
--- a/internal/generator/theme_matrix.go
+++ b/internal/generator/theme_matrix.go
@@ -3,22 +3,27 @@ package generator
 // matrixTemplate is a hacker-style theme inspired by The Matrix — black
 // background, bright matrix-green (#00ff41) text, monospace throughout,
 // no decorations beyond a faint scanline overlay.
+// WebGL scene: digital rain particle columns that simulate the iconic falling
+// green characters, with vertex-colour fading from bright head to dark tail.
 const matrixTemplate = `<!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>snonux.foo // MATRIX</title>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r134/three.min.js"></script>
     <style>
         :root { --g:#00ff41; --g2:#008f11; --g3:#003b00; --bg:#000; }
         * { margin:0; padding:0; box-sizing:border-box; }
         body { font-family:'Courier New',Courier,monospace; background:var(--bg); color:var(--g);
                overflow:hidden; height:100vh; }
-        /* scanline overlay */
+        /* scanline overlay sits above WebGL */
         body::before { content:''; position:fixed; inset:0; z-index:999; pointer-events:none;
             background:repeating-linear-gradient(0deg,transparent,transparent 3px,
                 rgba(0,0,0,0.08) 3px,rgba(0,0,0,0.08) 4px); }
         @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
+        /* WebGL background canvas */
+        #three-canvas { position:fixed; top:0; left:0; width:100%; height:100%; z-index:1; }
         .overlay { position:relative; z-index:10; height:100vh; display:flex; flex-direction:column; }
         header { padding:12px 24px; background:#000; border-bottom:1px solid var(--g2);
                  display:flex; align-items:center; justify-content:space-between; }
@@ -68,6 +73,7 @@ const matrixTemplate = `<!DOCTYPE html>
     </style>
 </head>
 <body>
+    <canvas id="three-canvas"></canvas>
     <div class="overlay">
         <header>
             <div class="logo">
@@ -97,6 +103,100 @@ const matrixTemplate = `<!DOCTYPE html>
         </div>
     </div>
     {{template "navmodal" .}}
+    <script>
+    // Matrix WebGL scene: 80 columns of falling particles with per-vertex colour.
+    // Each column has a "head" that falls at a random speed; particles near the head
+    // are bright green and fade to near-black further behind, simulating digital rain.
+    (function() {
+        var NUM_COLS   = 80;   // number of rain columns
+        var COL_LEN    = 25;   // particles per column
+        var SPACING    = 2.2;  // vertical gap between particles in a column
+        var Y_TOP      = 30;   // world-space top of the rain field
+        var Y_BOTTOM   = -30;  // world-space bottom
+
+        var scene, camera, renderer;
+        var points;
+        var posArr, colArr;
+        // Per-column state: x position, head y, and fall speed
+        var colX = [], headY = [], speed = [];
+
+        function initThree() {
+            scene = new THREE.Scene();
+            scene.background = new THREE.Color(0x000000);
+
+            camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 200);
+            camera.position.set(0, 0, 50);
+
+            renderer = new THREE.WebGLRenderer({ canvas: document.getElementById('three-canvas'), antialias: false });
+            renderer.setSize(window.innerWidth, window.innerHeight);
+            renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+
+            var totalPts = NUM_COLS * COL_LEN;
+            posArr = new Float32Array(totalPts * 3);
+            colArr = new Float32Array(totalPts * 3);
+
+            // Spread columns across x: -50..50; initialise heads at random y positions
+            for (var c = 0; c < NUM_COLS; c++) {
+                colX[c]  = -50 + (c / (NUM_COLS - 1)) * 100;
+                headY[c] = Y_TOP - Math.random() * (Y_TOP - Y_BOTTOM);
+                speed[c] = 0.08 + Math.random() * 0.07; // 0.08–0.15 units per frame
+            }
+
+            var geo = new THREE.BufferGeometry();
+            geo.setAttribute('position', new THREE.BufferAttribute(posArr, 3));
+            geo.setAttribute('color',    new THREE.BufferAttribute(colArr, 3));
+
+            var mat = new THREE.PointsMaterial({ size: 0.35, vertexColors: true });
+            points = new THREE.Points(geo, mat);
+            scene.add(points);
+
+            window.addEventListener('resize', onResize);
+            animate();
+        }
+
+        function onResize() {
+            camera.aspect = window.innerWidth / window.innerHeight;
+            camera.updateProjectionMatrix();
+            renderer.setSize(window.innerWidth, window.innerHeight);
+        }
+
+        function animate() {
+            requestAnimationFrame(animate);
+
+            for (var c = 0; c < NUM_COLS; c++) {
+                // Advance the head downward each frame
+                headY[c] -= speed[c];
+                // When the head exits the bottom, reset to a random point above the top
+                if (headY[c] < Y_BOTTOM - COL_LEN * SPACING) {
+                    headY[c] = Y_TOP + Math.random() * 20;
+                }
+
+                var base = c * COL_LEN;
+                for (var p = 0; p < COL_LEN; p++) {
+                    var i = base + p;
+                    var y = headY[c] + p * SPACING; // particles trail upward from head
+                    posArr[i * 3]     = colX[c];
+                    posArr[i * 3 + 1] = y;
+                    posArr[i * 3 + 2] = 0;
+
+                    // Brightness falls off with distance behind the head:
+                    // p=0 is the head (bright), p=COL_LEN-1 is the tail (dim)
+                    var bright = Math.max(0, 1 - p / (COL_LEN * 0.7));
+                    // Head particle: #00ff41, tail: #003b00
+                    colArr[i * 3]     = 0;
+                    colArr[i * 3 + 1] = bright * (p === 0 ? 1.0 : 0.88);
+                    colArr[i * 3 + 2] = bright * (p === 0 ? 0.255 : 0.04);
+                }
+            }
+
+            points.geometry.attributes.position.needsUpdate = true;
+            points.geometry.attributes.color.needsUpdate    = true;
+            renderer.render(scene, camera);
+        }
+
+        initThree();
+    })();
+    </script>
     {{template "navscript" .}}
 </body>
 </html>`
diff --git a/internal/generator/theme_minimal.go b/internal/generator/theme_minimal.go
index ebad091..00e9a17 100644
--- a/internal/generator/theme_minimal.go
+++ b/internal/generator/theme_minimal.go
@@ -1,67 +1,72 @@
 package generator
 
-// minimalTemplate is a clean white theme — system font, subtle borders,
-// no animations or decorations. Maximum readability.
-const minimalTemplate = `<!DOCTYPE html>
+// plasmaTemplate is a dark psychedelic plasma theme — overlapping translucent
+// spheres with additive blending drift on sine paths, creating lava-lamp-like
+// colour blobs against a near-black background.
+const plasmaTemplate = `<!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>snonux.foo</title>
+    <title>snonux.foo ◈ PLASMA</title>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r134/three.min.js"></script>
     <style>
-        :root { --accent:#0066cc; --border:#e2e2e2; --muted:#666; }
+        :root { --cyan:#00f0ff; --magenta:#ff00e0; --yellow:#ffee00; --bg:#050008; }
         * { margin:0; padding:0; box-sizing:border-box; }
-        body { font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,sans-serif;