diff --git a/src/cli.rs b/src/cli.rs
index a054472..bd09569 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1290,18 +1290,20 @@ pub(crate) fn visualization_html(
         r#"<!doctype html>
 <html><head><meta charset="utf-8"><title>Raysense</title>
 <style>
-/* Nord palette (https://www.nordtheme.com) — low-fatigue, eye-friendly. */
+/* Viridis-derived palette. Perceptually uniform, colorblind-safe.
+ * Bright end clamped to ~0.78 so white labels remain readable on
+ * the warmest tiles. */
 :root{{
-  --bg:#2e3440;       /* nord0  polar night */
-  --surface:#3b4252;  /* nord1 */
-  --surface2:#434c5e; /* nord2 */
-  --line:#4c566a;     /* nord3 */
-  --text:#eceff4;     /* nord6  snow storm */
-  --muted:#9aa6b6;    /* between nord3 and nord4 */
-  --accent:#88c0d0;   /* nord8  frost */
-  --good:#a3be8c;     /* nord14 aurora green */
-  --warn:#ebcb8b;     /* nord13 aurora yellow */
-  --bad:#bf616a;      /* nord11 aurora red */
+  --bg:#070b14;       /* deep graphite */
+  --surface:#0f1320;
+  --surface2:#161b2c;
+  --line:#252a3d;
+  --text:#e6e9ee;
+  --muted:#7a8294;
+  --accent:#21918c;   /* viridis mid teal */
+  --good:#5ec962;     /* viridis ~0.75 green */
+  --warn:#a5db36;     /* viridis ~0.85 yellow-green */
+  --bad:#f85149;      /* semantic emergency, outside viridis */
 }}
 *{{box-sizing:border-box;}}
 html,body{{margin:0;padding:0;height:100%;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:13px;line-height:1.4;}}
@@ -1362,11 +1364,12 @@ main.canvas{{position:relative;overflow:hidden;background:var(--bg);}}
 .tile.cycle{{stroke:var(--bad);stroke-width:2;}}
 .tile.gap{{filter:url(#stripe);}}
 .tile-label{{pointer-events:none;fill:var(--text);font-size:10px;}}
-.edge{{pointer-events:none;opacity:.7;fill:none;stroke-linecap:round;stroke-width:1.4;}}
-.edge.imports{{stroke:var(--accent);}}
-.edge.calls{{stroke:var(--good);}}
-.edge.inherits{{stroke:var(--warn);}}
-.edge.dim{{opacity:.08;}}
+.tile-lang{{pointer-events:none;fill:var(--text);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:9px;font-weight:600;letter-spacing:.06em;opacity:.75;}}
+.edge{{pointer-events:none;opacity:.5;fill:none;stroke-linecap:round;stroke-width:1;}}
+.edge.imports{{stroke:#21918c;}}     /* viridis mid teal */
+.edge.calls{{stroke:#5ec962;}}        /* viridis ~0.75 green */
+.edge.inherits{{stroke:#a5db36;}}     /* viridis ~0.85 yellow-green */
+.edge.dim{{opacity:.06;}}
 .ribbon{{pointer-events:none;fill:none;}}
 .zoom-overlay{{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(12,16,20,0.92);z-index:4;cursor:zoom-out;}}
 .zoom-overlay[hidden]{{display:none;}}
@@ -1496,26 +1499,94 @@ footer h4{{margin:0 0 4px;font-size:11px;color:var(--muted);text-transform:upper
   var selectedPath = null;
   var ATTR = {{lines:'lines', churn:'churn', age:'age', risk:'risk', instability:'instability'}};
   var HUE = {{lines:210, churn:12, age:280, risk:350, instability:50}};
-  // Nord palette — every color drawn from frost (cool blues/teals) and
-  // aurora (warm accents). Languages share the same saturation and
-  // lightness, so the treemap reads as one theme.
+  // Viridis colormap stops (matplotlib default). 11 anchor points,
+  // linearly interpolated. Input t is clamped to [0, 0.78] so the
+  // brightest tiles never reach full yellow — white labels stay readable.
+  var VIRIDIS = [
+    [68, 1, 84],     // 0.0
+    [72, 35, 116],
+    [64, 67, 135],
+    [52, 94, 141],
+    [41, 120, 142],
+    [32, 144, 140],
+    [34, 167, 132],
+    [68, 190, 112],
+    [121, 209, 81],
+    [189, 222, 38],
+    [253, 231, 36]   // 1.0
+  ];
+  var V_MAX = 0.78;
+  function viridis(t) {{
+    if (!isFinite(t)) t = 0;
+    t = Math.max(0, Math.min(V_MAX, t));
+    var n = VIRIDIS.length - 1;
+    var idx = t * n;
+    var lo = Math.floor(idx);
+    var hi = Math.min(lo + 1, n);
+    var f = idx - lo;
+    var a = VIRIDIS[lo], b = VIRIDIS[hi];
+    return 'rgb(' + Math.round(a[0] + (b[0]-a[0])*f) + ',' +
+                    Math.round(a[1] + (b[1]-a[1])*f) + ',' +
+                    Math.round(a[2] + (b[2]-a[2])*f) + ')';
+  }}
+  // Pick a label colour with enough contrast against the tile fill.
+  // Returns dark text on bright fills (viridis yellows/greens), and
+  // null otherwise so CSS's default light text wins.
+  function readableTextOn(c) {{
+    var r, g, b;
+    if (c[0] === '#') {{
+      var hex = c.slice(1);
+      if (hex.length === 3) hex = hex.split('').map(function(x){{return x+x;}}).join('');
+      r = parseInt(hex.slice(0,2),16)/255;
+      g = parseInt(hex.slice(2,4),16)/255;
+      b = parseInt(hex.slice(4,6),16)/255;
+    }} else {{
+      var m = c.match(/\d+/g);
+      if (!m || m.length < 3) return null;
+      r = +m[0]/255; g = +m[1]/255; b = +m[2]/255;
+    }}
+    var lum = 0.2126*r + 0.7152*g + 0.0722*b;
+    return lum > 0.55 ? '#08111c' : null;
+  }}
+  // Brand glyphs from Simple Icons (CC0, public domain). 24x24 viewBox.
+  // https://simpleicons.org — well-designed, recognizable language marks.
+  var LANG_ICON = {{
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+      markdown: 'M22.27 19.385H1.73A1.73 1.73 0 010 17.655V6.345a1.73 1.73 0 011.73-1.73h20.54A1.73 1.73 0 0124 6.345v11.308a1.73 1.73 0 01-1.73 1.731zM5.769 15.923v-4.5l2.308 2.885 2.307-2.885v4.5h2.308V8.078h-2.308l-2.307 2.885-2.308-2.885H3.46v7.847zM21.232 12h-2.309V8.077h-2.307V12h-2.308l3.461 4.039z',
+      toml: 'M.014 0h5.34v2.652H2.888v18.681h2.468V24H.015V0Zm17.622 5.049v2.78h-4.274v12.935h-3.008V7.83H6.059V5.05h11.577ZM23.986 24h-5.34v-2.652h2.467V2.667h-2.468V0h5.34v24Z',
+      yaml: 'm0 .97 4.111 6.453v4.09h2.638v-4.09L11.053.969H8.214L5.58 5.125 2.965.969Zm12.093.024-4.47 10.544h2.114l.97-2.345h4.775l.804 2.345h2.26L14.255.994Zm1.133 2.225 1.463 3.87h-3.096zm3.06 9.475v10.29H24v-2.199h-5.454v-8.091zm-12.175.002v10.335h2.217v-7.129l2.32 4.792h1.746l2.4-4.96v7.295h2.127V12.696h-2.904L9.44 17.37l-2.455-4.674Z',
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+      html: 'M1.5 0h21l-1.91 21.563L11.977 24l-8.564-2.438L1.5 0zm7.031 9.75l-.232-2.718 10.059.003.23-2.622L5.412 4.41l.698 8.01h9.126l-.326 3.426-2.91.804-2.955-.81-.188-2.11H6.248l.33 4.171L12 19.351l5.379-1.443.744-8.157H8.531z',
+      css: 'M0 0v20.16A3.84 3.84 0 0 0 3.84 24h16.32A3.84 3.84 0 0 0 24 20.16V3.84A3.84 3.84 0 0 0 20.16 0Zm14.256 13.08c1.56 0 2.28 1.08 2.304 2.64h-1.608c.024-.288-.048-.6-.144-.84-.096-.192-.288-.264-.552-.264-.456 0-.696.264-.696.84-.024.576.288.888.768 1.08.72.288 1.608.744 1.92 1.296q.432.648.432 1.656c0 1.608-.912 2.592-2.496 2.592-1.656 0-2.4-1.032-2.424-2.688h1.68c0 .792.264 1.176.792 1.176.264 0 .456-.072.552-.24.192-.312.24-1.176-.048-1.512-.312-.408-.912-.6-1.32-.816q-.828-.396-1.224-.936c-.24-.36-.36-.888-.36-1.536 0-1.44.936-2.472 2.424-2.448m5.4 0c1.584 0 2.304 1.08 2.328 2.64h-1.608c0-.288-.048-.6-.168-.84-.096-.192-.264-.264-.528-.264-.48 0-.72.264-.72.84s.288.888.792 1.08c.696.288 1.608.744 1.92 1.296.264.432.408.984.408 1.656.024 1.608-.888 2.592-2.472 2.592-1.68 0-2.424-1.056-2.448-2.688h1.68c0 .744.264 1.176.792 1.176.264 0 .456-.072.552-.24.216-.312.264-1.176-.048-1.512-.288-.408-.888-.6-1.32-.816-.552-.264-.96-.576-1.2-.936s-.36-.888-.36-1.536c-.024-1.44.912-2.472 2.4-2.448m-11.031.018c.711-.006 1.419.198 1.839.63.432.432.672 1.128.648 1.992H9.336c.024-.456-.096-.792-.432-.96-.312-.144-.768-.048-.888.24-.12.264-.192.576-.168.864v3.504c0 .744.264 1.128.768 1.128a.65.65 0 0 0 .552-.264c.168-.24.192-.552.168-.84h1.776c.096 1.632-.984 2.712-2.568 2.688-1.536 0-2.496-.864-2.472-2.472v-4.032c0-.816.24-1.44.696-1.848.432-.408 1.146-.624 1.857-.63',
+      shell: 'M21.038,4.9l-7.577-4.498C13.009,0.134,12.505,0,12,0c-0.505,0-1.009,0.134-1.462,0.403L2.961,4.9 C2.057,5.437,1.5,6.429,1.5,7.503v8.995c0,1.073,0.557,2.066,1.462,2.603l7.577,4.497C10.991,23.866,11.495,24,12,24 c0.505,0,1.009-0.134,1.461-0.402l7.577-4.497c0.904-0.537,1.462-1.529,1.462-2.603V7.503C22.5,6.429,21.943,5.437,21.038,4.9z M15.17,18.946l0.013,0.646c0.001,0.078-0.05,0.167-0.111,0.198l-0.383,0.22c-0.061,0.031-0.111-0.007-0.112-0.085L14.57,19.29 c-0.328,0.136-0.66,0.169-0.872,0.084c-0.04-0.016-0.057-0.075-0.041-0.142l0.139-0.584c0.011-0.046,0.036-0.092,0.069-0.121 c0.012-0.011,0.024-0.02,0.036-0.026c0.022-0.011,0.043-0.014,0.062-0.006c0.229,0.077,0.521,0.041,0.802-0.101 c0.357-0.181,0.596-0.545,0.592-0.907c-0.003-0.328-0.181-0.465-0.613-0.468c-0.55,0.001-1.064-0.107-1.072-0.917 c-0.007-0.667,0.34-1.361,0.889-1.8l-0.007-0.652c-0.001-0.08,0.048-0.168,0.111-0.2l0.37-0.236 c0.061-0.031,0.111,0.007,0.112,0.087l0.006,0.653c0.273-0.109,0.511-0.138,0.726-0.088c0.047,0.012,0.067,0.076,0.048,0.151 l-0.144,0.578c-0.011,0.044-0.036,0.088-0.065,0.116c-0.012,0.012-0.025,0.021-0.038,0.028c-0.019,0.01-0.038,0.013-0.057,0.009 c-0.098-0.022-0.332-0.073-0.699,0.113c-0.385,0.195-0.52,0.53-0.517,0.778c0.003,0.297,0.155,0.387,0.681,0.396 c0.7,0.012,1.003,0.318,1.01,1.023C16.105,17.747,15.736,18.491,15.17,18.946z M19.143,17.859c0,0.06-0.008,0.116-0.058,0.145 l-1.916,1.164c-0.05,0.029-0.09,0.004-0.09-0.056v-0.494c0-0.06,0.037-0.093,0.087-0.122l1.887-1.129 c0.05-0.029,0.09-0.004,0.09,0.056V17.859z M20.459,6.797l-7.168,4.427c-0.894,0.523-1.553,1.109-1.553,2.187v8.833 c0,0.645,0.26,1.063,0.66,1.184c-0.131,0.023-0.264,0.039-0.398,0.039c-0.42,0-0.833-0.114-1.197-0.33L3.226,18.64 c-0.741-0.44-1.201-1.261-1.201-2.142V7.503c0-0.881,0.46-1.702,1.201-2.142l7.577-4.498c0.363-0.216,0.777-0.33,1.197-0.33 c0.419,0,0.833,0.114,1.197,0.33l7.577,4.498c0.624,0.371,1.046,1.013,1.164,1.732C21.686,6.557,21.12,6.411,20.459,6.797z',
+  }};
+  // Languages sampled from viridis. All values stay below V_MAX so
+  // even the warmest tiles remain dark enough for white labels.
   var LANG = {{
-    rust:       '#d08770', // nord12 aurora orange
-    c:          '#81a1c1', // nord9  frost slate-blue
-    cpp:        '#b48ead', // nord15 aurora purple
-    python:     '#a3be8c', // nord14 aurora green
-    typescript: '#5e81ac', // nord10 frost dark blue
-    javascript: '#ebcb8b', // nord13 aurora yellow
-    go:         '#8fbcbb', // nord7  frost teal
-    java:       '#bf616a', // nord11 aurora red
-    ruby:       '#bf616a', // nord11
-    markdown:   '#4c566a', // nord3  polar night lightest
-    toml:       '#4c566a',
-    yaml:       '#4c566a',
-    json:       '#4c566a',
-    html:       '#d08770',
-    css:        '#88c0d0', // nord8  frost
-    shell:      '#a3be8c'  // share with python (script colour)
+    rust:       viridis(0.78), // warmest in our clamped range
+    c:          viridis(0.45),
+    cpp:        viridis(0.55),
+    python:     viridis(0.62),
+    typescript: viridis(0.30),
+    javascript: viridis(0.72),
+    go:         viridis(0.50),
+    java:       viridis(0.78),
+    ruby:       viridis(0.78),
+    markdown:   viridis(0.18),
+    toml:       viridis(0.18),
+    yaml:       viridis(0.18),
+    json:       viridis(0.18),
+    html:       viridis(0.74),
+    css:        viridis(0.35),
+    shell:      viridis(0.58)
   }};
   var pathToRect = {{}};
 
@@ -1579,7 +1650,7 @@ footer h4{{margin:0 0 4px;font-size:11px;color:var(--muted);text-transform:upper
     return h % 360;
   }}
   function colorFor(item, mode) {{
-    var FB = '#434c5e'; // nord2 — neutral mid-tone
+    var FB = '#30363d'; // primer line — neutral chrome
     if (mode === 'mono') return FB;
     if (mode === 'language') return LANG[item.language] || FB;
     if (mode === 'author') {{
@@ -1591,20 +1662,18 @@ footer h4{{margin:0 0 4px;font-size:11px;color:var(--muted);text-transform:upper
     if (mode === 'bus') {{
       var bf = +item.bus || 0;
       if (bf === 0) return FB;
-      if (bf === 1) return '#bf616a'; // nord11 red
-      if (bf === 2) return '#ebcb8b'; // nord13 yellow
-      return '#a3be8c';                // nord14 green
+      if (bf === 1) return '#f85149'; // status red
+      if (bf === 2) return '#d29922'; // status amber
+      return '#3fb950';                // status green
     }}
     if (mode === 'test_gap') {{
-      return item.test_gap ? '#d08770' : FB; // nord12 orange
+      return item.test_gap ? '#d29922' : FB; // amber = warning
     }}
     var attr = ATTR[mode]; if (!attr) return FB;
     var v = +item[attr] || 0;
     var max = files.reduce(function(m,it){{ return Math.max(m, +it[attr]||0); }}, 1) || 1;
     var ratio = v / max;
-    var hue = HUE[mode] || 210;
-    var lightness = 38 + Math.round(ratio * 22);
-    return 'hsl(' + hue + ',32%,' + lightness + '%)';
+    return viridis(ratio);
   }}
   // Auxiliary data
   var cycles = JSON.parse(document.getElementById('raysense-cycles').textContent || '[]');
@@ -1872,14 +1941,32 @@ footer h4{{margin:0 0 4px;font-size:11px;color:var(--muted);text-transform:upper
       rectEl.setAttribute('height', Math.max(r.h-1, 0));
       rectEl.setAttribute('fill', colorFor(r.item, mode));
       svg.appendChild(rectEl);
+      var dark = readableTextOn(rectEl.getAttribute('fill'));
       if (r.w > 60 && r.h > 18) {{
         var label = document.createElementNS('http://www.w3.org/2000/svg','text');
         label.setAttribute('class','tile-label');
         label.setAttribute('x', r.x + 4);
         label.setAttribute('y', r.y + 12);
+        if (dark) label.setAttribute('fill', dark);
         label.textContent = (r.path.split('/').pop() || '');
         svg.appendChild(label);
       }}
+      if (r.w > 60 && r.h > 28) {{
+        var icon = LANG_ICON[r.item.language];
+        if (icon) {{
+          var iconEl = document.createElementNS('http://www.w3.org/2000/svg', 'path');
+          iconEl.setAttribute('d', icon);
+          var size = 14;
+          var scale = size / 24;
+          var ix = r.x + r.w - size - 4;
+          var iy = r.y + 4;
+          iconEl.setAttribute('transform', 'translate(' + ix + ' ' + iy + ') scale(' + scale + ')');
+          iconEl.setAttribute('fill', dark || '#e6e9ee');
+          iconEl.setAttribute('opacity', '0.8');
+          iconEl.setAttribute('pointer-events', 'none');
+          svg.appendChild(iconEl);
+        }}
+      }}
     }});
     drawHighlight();
     drawEdges();
