diff --git a/frontend/postcss.config.js b/frontend/postcss.config.js
new file mode 100644
index 0000000..2e7af2b
--- /dev/null
+++ b/frontend/postcss.config.js
@@ -0,0 +1,6 @@
+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}
diff --git a/frontend/src/design-system/tokens.css b/frontend/src/design-system/tokens.css
new file mode 100644
index 0000000..348bfe2
--- /dev/null
+++ b/frontend/src/design-system/tokens.css
@@ -0,0 +1,204 @@
+/* ============================================================
+   ui-tokens.css
+   Design tokens Gruvbox Seventies — dark (par défaut) + light.
+   Sombre délavé (pas noir intense) / gris clair usé (pas blanc pur).
+   ============================================================ */
+
+:root,
+[data-theme="dark"] {
+  /* Couches de fond — sombre délavé, brun-gris chaud */
+  --bg-0: #221c17;          /* niveau le plus profond (rare) */
+  --bg-1: #2a231d;          /* fond app */
+  --bg-2: #322a23;          /* panneaux */
+  --bg-3: #3c332a;          /* cartes */
+  --bg-4: #4a4035;          /* hover */
+  --bg-5: #5a4f43;          /* press / actif */
+
+  /* Surfaces translucides */
+  --surf-glass: rgba(50, 42, 35, 0.72);
+  --surf-glass-strong: rgba(50, 42, 35, 0.92);
+  --surf-glass-soft: rgba(50, 42, 35, 0.42);
+
+  /* Bordures */
+  --border-1: rgba(168, 153, 132, 0.18);
+  --border-2: rgba(168, 153, 132, 0.32);
+  --border-3: rgba(168, 153, 132, 0.55);
+
+  /* Texte */
+  --ink-1: #f2e5c7;         /* cream principal */
+  --ink-2: #d5c4a1;         /* secondaire */
+  --ink-3: #a89984;         /* labels / hints */
+  --ink-4: #7c6f64;         /* désactivé */
+
+  /* Accent orange seventies */
+  --accent: #fe8019;
+  --accent-soft: #d65d0e;
+  --accent-glow: rgba(254, 128, 25, 0.35);
+  --accent-tint: rgba(254, 128, 25, 0.12);
+
+  /* Statuts */
+  --ok: #4dbb26;
+  --ok-glow: rgba(77, 187, 38, 0.45);
+  --warn: #fabd2f;
+  --warn-glow: rgba(250, 189, 47, 0.45);
+  --err: #fb4934;
+  --err-glow: rgba(251, 73, 52, 0.4);
+  --info: #83a598;
+  --info-glow: rgba(131, 165, 152, 0.4);
+
+  /* Couleurs additionnelles (datavis, badges, catégories) */
+  --blue: #3db0d1;
+  --blue-glow: rgba(61, 176, 209, 0.45);
+  --purple: #c882c8;
+  --purple-glow: rgba(200, 130, 200, 0.45);
+
+  /* Ombres */
+  --shadow-1: 0 1px 2px rgba(0,0,0,0.4);
+  --shadow-2: 0 4px 12px rgba(0,0,0,0.45);
+  --shadow-3: 0 12px 32px rgba(0,0,0,0.55);
+  --shadow-press: inset 0 2px 4px rgba(0,0,0,0.5);
+
+  /* Relief 3D pour tuiles : highlight haut + ombre bas + ombre portée */
+  --tile-3d:
+    inset 0 1px 0 rgba(255, 230, 180, 0.12),
+    inset 0 -1px 0 rgba(0, 0, 0, 0.45),
+    0 1px 0 rgba(0, 0, 0, 0.35),
+    0 2px 4px rgba(0, 0, 0, 0.4),
+    0 8px 18px rgba(0, 0, 0, 0.5);
+  --tile-3d-strong:
+    inset 0 1px 0 rgba(255, 230, 180, 0.18),
+    inset 0 -2px 0 rgba(0, 0, 0, 0.55),
+    0 1px 0 rgba(0, 0, 0, 0.4),
+    0 4px 8px rgba(0, 0, 0, 0.5),
+    0 14px 28px rgba(0, 0, 0, 0.55);
+
+  /* Polices */
+  --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
+  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
+  --font-terminal: 'Share Tech Mono', 'VT323', 'Courier New', monospace;
+}
+
+[data-theme="light"] {
+  /* Gris clair usé, légèrement chaud (pas blanc pur) */
+  --bg-0: #b8b2a3;
+  --bg-1: #d5d0c5;
+  --bg-2: #dcd7cc;
+  --bg-3: #e3ded3;
+  --bg-4: #ccc6b8;
+  --bg-5: #bdb6a7;
+
+  --surf-glass: rgba(220, 215, 204, 0.72);
+  --surf-glass-strong: rgba(220, 215, 204, 0.94);
+  --surf-glass-soft: rgba(220, 215, 204, 0.42);
+
+  --border-1: rgba(60, 56, 54, 0.15);
+  --border-2: rgba(60, 56, 54, 0.28);
+  --border-3: rgba(60, 56, 54, 0.5);
+
+  --ink-1: #28241f;
+  --ink-2: #3c3836;
+  --ink-3: #5a544c;
+  --ink-4: #8a8278;
+
+  --accent: #af3a03;
+  --accent-soft: #d65d0e;
+  --accent-glow: rgba(175, 58, 3, 0.28);
+  --accent-tint: rgba(175, 58, 3, 0.08);
+
+  --ok: #3c911c;
+  --ok-glow: rgba(60, 145, 28, 0.32);
+  --warn: #b57614;
+  --warn-glow: rgba(181, 118, 20, 0.35);
+  --err: #9d0006;
+  --err-glow: rgba(157, 0, 6, 0.3);
+  --info: #427b58;
+  --info-glow: rgba(66, 123, 88, 0.3);
+
+  /* Couleurs additionnelles (datavis, badges, catégories) */
+  --blue: #2d82a3;
+  --blue-glow: rgba(45, 130, 163, 0.32);
+  --purple: #8c468c;
+  --purple-glow: rgba(140, 70, 140, 0.32);
+
+  --shadow-1: 0 1px 2px rgba(40,30,20,0.12);
+  --shadow-2: 0 4px 12px rgba(40,30,20,0.15);
+  --shadow-3: 0 12px 32px rgba(40,30,20,0.2);
+  --shadow-press: inset 0 2px 4px rgba(40,30,20,0.18);
+
+  /* Relief light : highlight haut blanc cassé + ombre marquée */
+  --tile-3d:
+    inset 0 1px 0 rgba(255, 255, 255, 0.55),
+    inset 0 -1px 0 rgba(60, 50, 40, 0.18),
+    0 1px 0 rgba(60, 50, 40, 0.1),
+    0 2px 4px rgba(60, 50, 40, 0.12),
+    0 8px 18px rgba(60, 50, 40, 0.18);
+  --tile-3d-strong:
+    inset 0 1px 0 rgba(255, 255, 255, 0.7),
+    inset 0 -2px 0 rgba(60, 50, 40, 0.22),
+    0 1px 0 rgba(60, 50, 40, 0.15),
+    0 4px 8px rgba(60, 50, 40, 0.18),
+    0 14px 28px rgba(60, 50, 40, 0.22);
+}
+
+/* ============================================================
+   Reset minimal + base typo
+   ============================================================ */
+* { box-sizing: border-box; }
+html, body { margin: 0; padding: 0; }
+
+body {
+  font-family: var(--font-ui);
+  font-size: 14px;
+  color: var(--ink-1);
+  background: var(--bg-1);
+  -webkit-font-smoothing: antialiased;
+}
+
+.mono     { font-family: var(--font-mono); }
+.terminal { font-family: var(--font-terminal); letter-spacing: 0.02em; }
+.label {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  color: var(--ink-3);
+}
+
+/* ============================================================
+   Surfaces — relief 3D marqué, AUCUN effet hover
+   ============================================================ */
+.glass {
+  background: var(--surf-glass);
+  backdrop-filter: blur(12px) saturate(140%);
+  -webkit-backdrop-filter: blur(12px) saturate(140%);
+  border: 1px solid var(--border-2);
+  box-shadow: var(--tile-3d);
+}
+.glass-strong {
+  background: var(--surf-glass-strong);
+  backdrop-filter: blur(16px) saturate(150%);
+  -webkit-backdrop-filter: blur(16px) saturate(150%);
+  border: 1px solid var(--border-3);
+  box-shadow: var(--tile-3d-strong);
+}
+
+/* Élément cliquable : pas de hover, mais réelle pression 3D au clic */
+.interactive {
+  cursor: pointer;
+  transition: transform .04s ease-out, box-shadow .04s, background .04s;
+  transform: translateY(0);
+}
+.interactive:active {
+  transform: translateY(1px);
+  box-shadow: var(--shadow-press) !important;
+  filter: brightness(0.92);
+}
+
+/* Scrollbar custom */
+*::-webkit-scrollbar { width: 8px; height: 8px; }
+*::-webkit-scrollbar-track { background: transparent; }
+*::-webkit-scrollbar-thumb {
+  background: var(--border-2);
+  border-radius: 4px;
+}
+*::-webkit-scrollbar-thumb:hover { background: var(--accent-soft); }
diff --git a/frontend/src/design-system/ui-kit.tsx b/frontend/src/design-system/ui-kit.tsx
new file mode 100644
index 0000000..d8b9747
--- /dev/null
+++ b/frontend/src/design-system/ui-kit.tsx
@@ -0,0 +1,669 @@
+// @ts-nocheck
+/* ============================================================
+   ui-kit.tsx
+   Composants haute-fid Gruvbox Seventies.
+   Tout est purement décoratif/interactif côté composant.
+   Effets : transparence (glass), hover glow, click 3D, tooltips.
+   Adapté de ui-kit.jsx (UMD → ESM TypeScript)
+   ============================================================ */
+
+import { useState, useRef, useEffect } from 'react'
+
+/* ============================================================
+   Icônes — Font Awesome 6 Free.
+   Mapping nom logique → classe FA. Le CSS de FA est chargé en CDN
+   dans le <head>. Le composant garde la MÊME API qu'avant (name,
+   size, style) pour ne rien casser ailleurs.
+   ============================================================ */
+const ICON_MAP = {
+  cpu:      'microchip',
+  memory:   'memory',
+  disk:     'hard-drive',
+  network:  'network-wired',
+  clock:    'clock',
+  grid:     'table-cells',
+  list:     'list',
+  cog:      'gear',
+  alert:    'triangle-exclamation',
+  bell:     'bell',
+  server:   'server',
+  chart:    'chart-line',
+  bars:     'chart-simple',
+  terminal: 'terminal',
+  refresh:  'arrows-rotate',
+  play:     'play',
+  pause:    'pause',
+  power:    'power-off',
+  sun:      'sun',
+  moon:     'moon',
+  search:   'magnifying-glass',
+  close:    'xmark',
+  chevR:    'chevron-right',
+  chevL:    'chevron-left',
+  chevD:    'chevron-down',
+  chevU:    'chevron-up',
+  plus:     'plus',
+  filter:   'filter',
+  download: 'download',
+  folder:   'folder',
+  node:     'circle-nodes',
+  user:     'user',
+};
+
+const Icon = ({ name, size = 16, style }) => {
+  const fa = ICON_MAP[name] || 'circle-question';
+  return (
+    <i className={`fa-solid fa-${fa}`} aria-hidden="true" style={{
+      fontSize: size,
+      width: size,
+      height: size,
+      lineHeight: `${size}px`,
+      textAlign: 'center',
+      display: 'inline-flex',
+      alignItems: 'center',
+      justifyContent: 'center',
+      flex: '0 0 auto',
+      color: 'currentColor',
+      ...style,
+    }} />
+  );
+};
+
+/* ============================================================
+   Tooltip — apparaît au hover après 300ms, position auto.
+   ============================================================ */
+function Tooltip({ children, label, side = 'top' }) {
+  const [show, setShow] = useState(false);
+  const t = useRef();
+  const onEnter = () => { t.current = setTimeout(() => setShow(true), 280); };
+  const onLeave = () => { clearTimeout(t.current); setShow(false); };
+  const sides = {
+    top:    { bottom: 'calc(100% + 8px)', left: '50%', transform: 'translateX(-50%)' },
+    bottom: { top:    'calc(100% + 8px)', left: '50%', transform: 'translateX(-50%)' },
+    left:   { right:  'calc(100% + 8px)', top: '50%', transform: 'translateY(-50%)' },
+    right:  { left:   'calc(100% + 8px)', top: '50%', transform: 'translateY(-50%)' },
+  };
+  return (
+    <span style={{ position: 'relative', display: 'inline-flex' }}
+          onMouseEnter={onEnter} onMouseLeave={onLeave}>
+      {children}
+      {show && (
+        <span className="glass-strong" style={{
+          position: 'absolute', ...sides[side],
+          padding: '6px 10px',
+          borderRadius: 6,
+          fontSize: 12, lineHeight: 1.3,
+          color: 'var(--ink-1)',
+          whiteSpace: 'nowrap',
+          boxShadow: 'var(--shadow-2)',
+          zIndex: 1000,
+          pointerEvents: 'none',
+          fontFamily: 'JetBrains Mono, monospace',
+          letterSpacing: '0.02em',
+        }}>{label}</span>
+      )}
+    </span>
+  );
+}
+
+/* ============================================================
+   IconButton — bouton icône seul + tooltip obligatoire.
+   ============================================================ */
+function IconButton({ icon, label, onClick, active, danger, size = 34, primary }) {
+  const bg = active ? 'var(--accent-tint)'
+           : primary ? 'var(--accent)'
+           : 'var(--bg-3)';
+  const fg = active ? 'var(--accent)'
+           : primary ? 'var(--bg-1)'
+           : danger  ? 'var(--err)'
+           : 'var(--ink-2)';
+  const bd = active ? 'var(--accent-soft)' : 'var(--border-2)';
+  return (
+    <Tooltip label={label}>
+      <button onClick={onClick} className="interactive" style={{
+        width: size, height: size,
+        background: bg,
+        color: fg,
+        border: `1px solid ${bd}`,
+        borderRadius: 8,
+        display: 'flex', alignItems: 'center', justifyContent: 'center',
+        padding: 0, cursor: 'pointer',
+        boxShadow: primary ? '0 2px 6px var(--accent-glow)' : 'var(--shadow-1)',
+      }}>
+        <Icon name={icon} size={Math.round(size * 0.5)} />
+      </button>
+    </Tooltip>
+  );
+}
+
+/* ============================================================
+   Toggle on/off — switch tactile avec glow accent quand ON
+   ============================================================ */
+function Toggle({ on, onChange, label, icon }) {
+  return (
+    <div style={{ display: 'inline-flex', alignItems: 'center', gap: 10 }}>
+      {icon && <Icon name={icon} size={14} style={{ color: on ? 'var(--accent)' : 'var(--ink-3)' }} />}
+      {label && <span className="label" style={{ color: on ? 'var(--ink-1)' : 'var(--ink-3)' }}>{label}</span>}
+      <button onClick={() => onChange(!on)} className="interactive" style={{
+        width: 42, height: 22, borderRadius: 12,
+        background: on ? 'var(--accent)' : 'var(--bg-4)',
+        border: `1px solid ${on ? 'var(--accent-soft)' : 'var(--border-2)'}`,
+        boxShadow: on ? `0 0 10px var(--accent-glow), var(--shadow-1)` : 'var(--shadow-press)',
+        position: 'relative', cursor: 'pointer', padding: 0,
+      }}>
+        <span style={{
+          position: 'absolute', top: 1, left: on ? 21 : 1,
+          width: 18, height: 18, borderRadius: '50%',
+          background: on ? 'var(--bg-1)' : 'var(--ink-2)',
+          transition: 'left .18s cubic-bezier(.5,.2,.3,1.3), background .15s',
+          boxShadow: 'var(--shadow-1)',
+        }} />
+      </button>
+    </div>
+  );
+}
+
+/* ============================================================
+   Status LED — pastille pulsante (effet halo si critique)
+   ============================================================ */
+function StatusLed({ status = 'ok', size = 10, pulse }) {
+  const map = {
+    ok:   { c: 'var(--ok)',   g: 'var(--ok-glow)' },
+    warn: { c: 'var(--warn)', g: 'var(--warn-glow)' },
+    err:  { c: 'var(--err)',  g: 'var(--err-glow)' },
+    off:  { c: 'var(--ink-4)', g: 'transparent' },
+    info: { c: 'var(--info)', g: 'var(--info-glow)' },
+  };
+  const { c, g } = map[status];
+  const id = `pulse-${status}-${size}`;
+  return (
+    <>
+      {pulse && (
+        <style>{`@keyframes ${id} { 0%{box-shadow:0 0 0 0 ${g}} 70%{box-shadow:0 0 0 6px transparent} 100%{box-shadow:0 0 0 0 transparent} }`}</style>
+      )}
+      <span style={{
+        display: 'inline-block',
+        width: size, height: size,
+        borderRadius: '50%',
+        background: c,
+        boxShadow: status === 'off' ? 'none' : `0 0 6px ${g}, inset 0 0 2px rgba(0,0,0,0.3)`,
+        animation: pulse ? `${id} 1.8s ease-out infinite` : 'none',
+        flex: '0 0 auto',
+      }} />
+    </>
+  );
+}
+
+/* ============================================================
+   BatteryGauge — jauge horizontale style batterie
+   - Pas de bandes (couleur unie + léger gloss interne)
+   - Pas de graduations verticales
+   - Hover : glow lumineux dans la couleur de la jauge
+   - Mode compact : label [bar] valeur sur une seule ligne
+   ============================================================ */
+function BatteryGauge({ value = 60, label, max = 100, unit = '%', warnAt = 70, errAt = 90, height = 22, compact = false, color: colorOverride, icon }) {
+  const pct = Math.max(0, Math.min(100, (value / max) * 100));
+  const color = colorOverride
+    || (pct >= errAt ? 'var(--err)' : pct >= warnAt ? 'var(--warn)' : 'var(--ok)');
+  const glowVar = pct >= errAt ? 'var(--err-glow)'
+                : pct >= warnAt ? 'var(--warn-glow)'
+                : 'var(--ok-glow)';
+
+  // Variante compacte : label [bar] valeur sur une seule ligne
+  if (compact) {
+    return (
+      <div className="bg-hover" style={{
+        display: 'flex', alignItems: 'center', gap: 10, minWidth: 0,
+        '--bg-glow': glowVar,
+      }}>
+        {(icon || label) && (
+          <span style={{
+            flex: '0 0 auto', display: 'inline-flex', alignItems: 'center', gap: 6,
+            minWidth: 90,
+          }}>
+            {icon && <Icon name={icon} size={12} style={{ color: 'var(--ink-3)' }} />}
+            {label && <span className="label" style={{ fontSize: 11 }}>{label}</span>}
+          </span>
+        )}
+        <div className="bg-bar" style={{
+          flex: 1, height: 12, borderRadius: 3,
+          background: 'var(--bg-1)',
+          border: '1px solid var(--border-2)',
+          boxShadow: 'inset 0 1px 2px rgba(0,0,0,0.4)',
+          overflow: 'hidden', position: 'relative',
+          transition: 'border-color .2s',
+        }}>
+          <div className="bg-fill" style={{
+            position: 'absolute', top: 1, left: 1, bottom: 1,
+            width: `calc((100% - 2px) * ${pct / 100})`,
+            background: color,
+            borderRadius: 2,
+            transition: 'width .4s cubic-bezier(.3,.6,.3,1), box-shadow .2s',
+          }} />
+        </div>
+        <span className="mono" style={{
+          flex: '0 0 auto', fontSize: 13,
+          color: 'var(--ink-1)', minWidth: 52, textAlign: 'right',
+        }}>
+          {value}<span style={{ color: 'var(--ink-3)', marginLeft: 2 }}>{unit}</span>
+        </span>
+      </div>
+    );
+  }
+
+  return (
+    <div className="bg-hover" style={{
+      display: 'flex', flexDirection: 'column', gap: 6, minWidth: 0,
+      '--bg-glow': glowVar,
+    }}>
+      {label && (
+        <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'baseline' }}>
+          <span className="label">{label}</span>
+          <span className="mono" style={{ fontSize: 13, color: 'var(--ink-1)' }}>
+            {value}<span style={{ color: 'var(--ink-3)', marginLeft: 2 }}>{unit}</span>
+          </span>
+        </div>
+      )}
+      <div className="bg-bar" style={{
+        position: 'relative',
+        height, borderRadius: 4,
+        background: 'var(--bg-1)',
+        border: '1px solid var(--border-2)',
+        boxShadow: 'inset 0 1px 2px rgba(0,0,0,0.4)',
+        overflow: 'hidden',
+        transition: 'border-color .2s',
+      }}>
+        <div className="bg-fill" style={{
+          position: 'absolute', top: 1, left: 1, bottom: 1,
+          width: `calc((100% - 2px) * ${pct / 100})`,
+          background: color,
+          borderRadius: 3,
+          transition: 'width .4s cubic-bezier(.3,.6,.3,1), box-shadow .2s',
+        }} />
+        {/* Gloss interne très léger (un seul highlight haut, pas de bande inférieure) */}
+        <div style={{
+          position: 'absolute', top: 1, left: 1, right: 1, height: '40%',
+          background: 'linear-gradient(180deg, rgba(255,255,255,0.18), transparent)',
+          borderRadius: '3px 3px 0 0',
+          pointerEvents: 'none',
+        }} />
+      </div>
+    </div>
+  );
+}
+
+/* ============================================================
+   RadialGauge — jauge ronde, version épurée
+   ============================================================ */
+function RadialGauge({ value = 64, label, size = 120, warnAt = 70, errAt = 90 }) {
+  const pct = Math.max(0, Math.min(100, value));
+  const color = pct >= errAt ? 'var(--err)' : pct >= warnAt ? 'var(--warn)' : 'var(--ok)';
+  const glow  = pct >= errAt ? 'var(--err-glow)' : pct >= warnAt ? 'var(--warn-glow)' : 'var(--ok-glow)';
+  const r = size / 2 - 10;
+  const cx = size / 2;
+  const cy = size / 2 + 6;
+  const circ = Math.PI * r;
+  const offset = circ - (pct / 100) * circ;
+  return (
+    <div className="gauge-hover" style={{ display: 'flex', flexDirection: 'column', alignItems: 'center', gap: 2 }}>
+      <svg width={size} height={size * 0.72} viewBox={`0 0 ${size} ${size * 0.8}`}>
+        <defs>
+          <filter id={`glow-${label}`} x="-50%" y="-50%" width="200%" height="200%">
+            <feGaussianBlur stdDeviation="2.5" />
+          </filter>
+        </defs>
+        {/* arc background */}
+        <path d={`M ${cx - r} ${cy} A ${r} ${r} 0 0 1 ${cx + r} ${cy}`}
+              fill="none" stroke="var(--bg-4)" strokeWidth="6" strokeLinecap="round" />
+        {/* arc value glow */}
+        <path d={`M ${cx - r} ${cy} A ${r} ${r} 0 0 1 ${cx + r} ${cy}`}
+              fill="none" stroke={color} strokeWidth="8" strokeLinecap="round"
+              strokeDasharray={circ} strokeDashoffset={offset}
+              filter={`url(#glow-${label})`} opacity="0.7" />
+        {/* arc value crisp */}
+        <path d={`M ${cx - r} ${cy} A ${r} ${r} 0 0 1 ${cx + r} ${cy}`}
+              fill="none" stroke={color} strokeWidth="5" strokeLinecap="round"
+              strokeDasharray={circ} strokeDashoffset={offset}
+              style={{ transition: 'stroke-dashoffset .5s cubic-bezier(.3,.6,.3,1)' }} />
+      </svg>
+      <div style={{ marginTop: -10, textAlign: 'center' }}>
+        <div className="mono" style={{ fontSize: size * 0.22, fontWeight: 600, color: 'var(--ink-1)', lineHeight: 1 }}>
+          {value}<span style={{ fontSize: '0.55em', color: 'var(--ink-3)', marginLeft: 2 }}>%</span>
+        </div>
+        {label && <div className="label" style={{ marginTop: 2 }}>{label}</div>}
+      </div>
+    </div>
+  );
+}
+
+/* ============================================================
+   BigRadialGauge — la grande jauge cockpit "santé système"
+   ============================================================ */
+function BigRadialGauge({ value = 87, label = 'score santé · stable' }) {
+  const size = 320;
+  const r = 130;
+  const cx = size / 2;
+  const cy = size / 2 + 30;
+  const circ = Math.PI * r;
+  const offset = circ - (value / 100) * circ;
+  const color = value >= 80 ? 'var(--ok)' : value >= 50 ? 'var(--warn)' : 'var(--err)';
+  return (
+    <div className="gauge-hover" style={{ position: 'relative', width: size, height: size * 0.78 }}>
+      <svg width={size} height={size * 0.85}>
+        <defs>
+          <filter id="biggauge-glow" x="-50%" y="-50%" width="200%" height="200%">
+            <feGaussianBlur stdDeviation="4" />
+          </filter>
+          <linearGradient id="biggauge-grad" x1="0" y1="0" x2="1" y2="0">
+            <stop offset="0" stopColor={color} stopOpacity="0.7"/>
+            <stop offset="1" stopColor={color}/>
+          </linearGradient>
+        </defs>
+        {/* tics */}
+        {Array.from({ length: 21 }).map((_, i) => {
+          const a = Math.PI - (i / 20) * Math.PI;
+          const major = i % 5 === 0;
+          const inner = major ? r + 8 : r + 11;
+          const outer = major ? r + 20 : r + 15;
+          return <line key={i}
+            x1={cx + Math.cos(a) * inner} y1={cy - Math.sin(a) * inner}
+            x2={cx + Math.cos(a) * outer} y2={cy - Math.sin(a) * outer}
+            stroke={major ? 'var(--ink-3)' : 'var(--ink-4)'} strokeWidth={major ? 1.5 : 0.8}
+          />;
+        })}
+        {[0, 50, 100].map(v => {
+          const a = Math.PI - (v / 100) * Math.PI;
+          const x = cx + Math.cos(a) * (r + 32);
+          const y = cy - Math.sin(a) * (r + 32) + 4;
+          return <text key={v} x={x} y={y} textAnchor="middle"
+                       fontFamily="JetBrains Mono" fontSize="11"
+                       fill="var(--ink-3)">{v}</text>;
+        })}
+        {/* arc bg */}
+        <path d={`M ${cx - r} ${cy} A ${r} ${r} 0 0 1 ${cx + r} ${cy}`}
+              fill="none" stroke="var(--bg-4)" strokeWidth="10" strokeLinecap="round" />
+        {/* arc value glow */}
+        <path d={`M ${cx - r} ${cy} A ${r} ${r} 0 0 1 ${cx + r} ${cy}`}
+              fill="none" stroke={color} strokeWidth="14" strokeLinecap="round"
+              strokeDasharray={circ} strokeDashoffset={offset}
+              filter="url(#biggauge-glow)" opacity="0.55" />
+        {/* arc value */}
+        <path d={`M ${cx - r} ${cy} A ${r} ${r} 0 0 1 ${cx + r} ${cy}`}
+              fill="none" stroke="url(#biggauge-grad)" strokeWidth="9" strokeLinecap="round"
+              strokeDasharray={circ} strokeDashoffset={offset}
+              style={{ transition: 'stroke-dashoffset .8s cubic-bezier(.3,.6,.3,1)' }} />
+        {/* needle */}
+        <line x1={cx} y1={cy}
+              x2={cx + Math.cos(Math.PI - (value / 100) * Math.PI) * (r - 14)}
+              y2={cy - Math.sin(Math.PI - (value / 100) * Math.PI) * (r - 14)}
+              stroke="var(--accent)" strokeWidth="3" strokeLinecap="round"
+              style={{ filter: 'drop-shadow(0 0 4px var(--accent-glow))' }} />
+        <circle cx={cx} cy={cy} r="9" fill="var(--bg-3)" stroke="var(--border-3)" strokeWidth="1.5"/>
+        <circle cx={cx} cy={cy} r="3" fill="var(--accent)" />
+      </svg>
+      <div style={{ position: 'absolute', bottom: 12, left: 0, right: 0, textAlign: 'center' }}>
+        <div className="mono" style={{
+          fontSize: 64, fontWeight: 700, lineHeight: 1,
+          color: 'var(--ink-1)',
+          textShadow: `0 0 20px ${color}33`,
+        }}>{value}</div>
+        <div className="label" style={{ marginTop: 6 }}>{label}</div>
+      </div>
+    </div>
+  );
+}
+
+/* ============================================================
+   Popup — modale glassmorphism centrée + bouton fermer
+   ============================================================ */
+function Popup({ open, onClose, title, children, footer, width = 460 }) {
+  if (!open) return null;
+  return (
+    <div style={{
+      position: 'absolute', inset: 0, zIndex: 100,
+      background: 'rgba(0,0,0,0.45)',
+      backdropFilter: 'blur(4px)',
+      display: 'flex', alignItems: 'center', justifyContent: 'center',
+      animation: 'fadein .2s ease-out',
+    }} onClick={onClose}>
+      <style>{`
+        @keyframes fadein { from { opacity: 0 } to { opacity: 1 } }
+        @keyframes popin { from { opacity: 0; transform: translateY(8px) scale(.98) } to { opacity: 1; transform: translateY(0) scale(1) } }
+      `}</style>
+      <div className="glass-strong" onClick={e => e.stopPropagation()} style={{
+        width, maxWidth: '90%',
+        borderRadius: 12,
+        boxShadow: 'var(--shadow-3)',
+        animation: 'popin .25s cubic-bezier(.3,.7,.3,1.2)',
+        overflow: 'hidden',
+      }}>
+        <div style={{
+          padding: '14px 16px',
+          borderBottom: '1px solid var(--border-1)',
+          display: 'flex', alignItems: 'center', justifyContent: 'space-between',
+          background: 'var(--bg-3)',
+        }}>
+          <div style={{ fontWeight: 600, fontSize: 15, color: 'var(--ink-1)' }}>{title}</div>
+          <IconButton icon="close" label="Fermer" onClick={onClose} size={28} />
+        </div>
+        <div style={{ padding: 18 }}>{children}</div>
+        {footer && (
+          <div style={{
+            padding: '12px 16px',
+            borderTop: '1px solid var(--border-1)',
+            background: 'var(--bg-2)',
+            display: 'flex', justifyContent: 'flex-end', gap: 8,
+          }}>{footer}</div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+/* ============================================================
+   Button — bouton classique avec variantes
+   ============================================================ */
+function Button({ children, icon, onClick, variant = 'default', size = 'md' }) {
+  const sizes = {
+    sm: { padding: '5px 10px', fontSize: 12, h: 28 },
+    md: { padding: '7px 14px', fontSize: 13, h: 34 },
+    lg: { padding: '10px 18px', fontSize: 14, h: 40 },
+  }[size];
+  const variants = {
+    default: { bg: 'var(--bg-3)', fg: 'var(--ink-1)', bd: 'var(--border-2)' },
+    primary: { bg: 'var(--accent)', fg: 'var(--bg-1)', bd: 'var(--accent-soft)' },
+    ghost:   { bg: 'transparent', fg: 'var(--ink-2)', bd: 'var(--border-2)' },
+    danger:  { bg: 'var(--bg-3)', fg: 'var(--err)', bd: 'var(--err)' },
+  }[variant];
+  return (
+    <button onClick={onClick} className="interactive" style={{
+      height: sizes.h,
+      padding: sizes.padding,
+      background: variants.bg,
+      color: variants.fg,
+      border: `1px solid ${variants.bd}`,
+      borderRadius: 8,
+      display: 'inline-flex', alignItems: 'center', gap: 8,
+      fontFamily: 'inherit', fontSize: sizes.fontSize, fontWeight: 500,
+      cursor: 'pointer',
+      boxShadow: variant === 'primary' ? '0 2px 8px var(--accent-glow)' : 'var(--shadow-1)',
+    }}>
+      {icon && <Icon name={icon} size={14} />}
+      {children}
+    </button>
+  );
+}
+
+/* ============================================================
+   TreeNav — arbre dépliable avec icône en tête (style B)
+   ============================================================ */
+function TreeNav({ groups, activeId, onSelect }) {
+  const [open, setOpen] = useState(() =>
+    Object.fromEntries(groups.map(g => [g.id, g.open !== false]))
+  );
+  return (
+    <div style={{ display: 'flex', flexDirection: 'column', gap: 2 }}>
+      {groups.map(g => (
+        <div key={g.id}>
+          <div className="interactive" onClick={() => setOpen({ ...open, [g.id]: !open[g.id] })}
+               style={{
+                 display: 'flex', alignItems: 'center', gap: 8,
+                 padding: '7px 8px', borderRadius: 6,
+                 color: 'var(--ink-2)',
+                 background: 'transparent',
+                 border: '1px solid transparent',
+                 cursor: 'pointer',
+               }}>
+            <Icon name="chevR" size={12} style={{
+              transform: open[g.id] ? 'rotate(90deg)' : 'rotate(0)',
+              transition: 'transform .15s',
+              color: 'var(--ink-3)',
+            }} />
+            <Icon name={g.icon || 'folder'} size={15} style={{ color: 'var(--accent)' }} />
+            <span style={{ flex: 1, fontSize: 13, fontWeight: 500 }}>{g.label}</span>
+            {g.count != null && (
+              <span className="mono" style={{ fontSize: 10, color: 'var(--ink-3)' }}>
+                {g.count}
+              </span>
+            )}
+          </div>
+          {open[g.id] && (
+            <div style={{ marginLeft: 18, marginTop: 2, display: 'flex', flexDirection: 'column', gap: 1, paddingLeft: 8, borderLeft: '1px dashed var(--border-1)' }}>
+              {g.children.map(c => {
+                const active = c.id === activeId;
+                return (
+                  <div key={c.id} className="interactive" onClick={() => onSelect && onSelect(c.id)}
+                       style={{
+                         display: 'flex', alignItems: 'center', gap: 8,
+                         padding: '6px 10px', borderRadius: 6,
+                         background: active ? 'var(--accent-tint)' : 'transparent',
+                         color: active ? 'var(--ink-1)' : 'var(--ink-2)',
+                         borderLeft: active ? '2px solid var(--accent)' : '2px solid transparent',
+                         marginLeft: active ? 0 : 2,
+                         fontSize: 12.5,
+                       }}>
+                    <StatusLed status={c.status} size={8} pulse={c.status === 'err'} />
+                    <span className="mono" style={{ fontSize: 11.5, flex: 1 }}>{c.label}</span>
+                    {c.meta && <span className="mono" style={{ fontSize: 10, color: 'var(--ink-3)' }}>{c.meta}</span>}
+                  </div>
+                );
+              })}
+            </div>
+          )}
+        </div>
+      ))}
+    </div>
+  );
+}
+
+/* ============================================================
+   Sparkline pour les KPI
+   ============================================================ */
+function Sparkline({ points = [], color = 'var(--accent)', h = 28 }) {
+  const w = 100;
+  const max = Math.max(...points);
+  const min = Math.min(...points);
+  const range = max - min || 1;
+  const step = w / (points.length - 1);
+  const path = points.map((p, i) =>
+    `${i === 0 ? 'M' : 'L'} ${(i * step).toFixed(1)} ${(h - 2 - ((p - min) / range) * (h - 4)).toFixed(1)}`
+  ).join(' ');
+  const area = path + ` L ${w} ${h} L 0 ${h} Z`;
+  return (
+    <svg viewBox={`0 0 ${w} ${h}`} preserveAspectRatio="none" style={{ width: '100%', height: h }}>
+      <path d={area} fill={color} opacity="0.12" />
+      <path d={path} fill="none" stroke={color} strokeWidth="1.5" strokeLinejoin="round" strokeLinecap="round" />
+    </svg>
+  );
+}
+
+/* ============================================================
+   LineChart — grand graph multi-séries
+   ============================================================ */
+function LineChart({ series, h = 200, labels }) {
+  const w = 600;
+  const padding = { l: 36, r: 12, t: 12, b: 24 };
+  const innerW = w - padding.l - padding.r;
+  const innerH = h - padding.t - padding.b;
+  const all = series.flatMap(s => s.points);
+  const max = Math.max(...all) * 1.1;
+  const min = 0;
+  const range = max - min;
+  const ptsCount = series[0].points.length;
+  const step = innerW / (ptsCount - 1);
+  return (
+    <svg viewBox={`0 0 ${w} ${h}`} preserveAspectRatio="none" style={{ width: '100%', height: h }}>
+      {/* grid horizontal */}
+      {[0, 0.25, 0.5, 0.75, 1].map(p => {
+        const y = padding.t + innerH * p;
+        const v = Math.round(max - range * p);
+        return (
+          <g key={p}>
+            <line x1={padding.l} x2={w - padding.r} y1={y} y2={y}
+                  stroke="var(--border-1)" strokeWidth="1" strokeDasharray="3 5" />
+            <text x={padding.l - 6} y={y + 3} textAnchor="end"
+                  fontFamily="JetBrains Mono" fontSize="9" fill="var(--ink-3)">{v}</text>
+          </g>
+        );
+      })}
+      {/* labels x */}
+      {labels && labels.map((lb, i) => (
+        i % Math.ceil(labels.length / 8) === 0 && (
+          <text key={i} x={padding.l + i * step} y={h - 6} textAnchor="middle"
+                fontFamily="JetBrains Mono" fontSize="9" fill="var(--ink-3)">{lb}</text>
+        )
+      ))}
+      {/* séries */}
+      {series.map((s, si) => {
+        const path = s.points.map((p, i) =>
+          `${i === 0 ? 'M' : 'L'} ${(padding.l + i * step).toFixed(1)} ${(padding.t + innerH - ((p - min) / range) * innerH).toFixed(1)}`
+        ).join(' ');
+        const area = path + ` L ${padding.l + (ptsCount - 1) * step} ${padding.t + innerH} L ${padding.l} ${padding.t + innerH} Z`;
+        return (
+          <g key={si}>
+            <path d={area} fill={s.color} opacity="0.12" />
+            <path d={path} fill="none" stroke={s.color} strokeWidth="1.8"
+                  strokeLinejoin="round" strokeLinecap="round" />
+          </g>
+        );
+      })}
+    </svg>
+  );
+}
+
+/* Effets hover sur les jauges (sans effet au clic) */
+(function injectGaugeHoverStyles() {
+  if (typeof document === 'undefined') return;
+  if (document.getElementById('gauge-hover-styles')) return;
+  const s = document.createElement('style');
+  s.id = 'gauge-hover-styles';
+  s.textContent = `
+    .bg-hover:hover .bg-bar {
+      border-color: color-mix(in oklch, var(--accent) 60%, var(--border-3));
+    }
+    .bg-hover:hover .bg-fill {
+      box-shadow: 0 0 14px var(--bg-glow, var(--accent-glow));
+      filter: brightness(1.15);
+    }
+    .gauge-hover { transition: filter .2s; }
+    .gauge-hover:hover { filter: drop-shadow(0 0 8px var(--accent-glow)) brightness(1.08); }
+  `;
+  document.head.appendChild(s);
+})();
+
+/* Exports nommés ESM */
+export {
+  Icon,
+  Tooltip,
+  IconButton,
+  Toggle,
+  StatusLed,
+  BatteryGauge,
+  RadialGauge,
+  BigRadialGauge,
+  Popup,
+  Button,
+  TreeNav,
+  Sparkline,
+  LineChart,
+}
diff --git a/frontend/src/index.css b/frontend/src/index.css
index 4312d8f..dc0085b 100644
--- a/frontend/src/index.css
+++ b/frontend/src/index.css
@@ -1,4 +1,16 @@
-/* sera complété à la Tâche 10 */
+@import './design-system/tokens.css';
+
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+* {
+  box-sizing: border-box;
+}
+
 body {
+  font-family: var(--font-ui);
+  background-color: var(--bg-1);
+  color: var(--ink-1);
   margin: 0;
 }
diff --git a/frontend/tailwind.config.ts b/frontend/tailwind.config.ts
new file mode 100644
index 0000000..4e33cb8
--- /dev/null
+++ b/frontend/tailwind.config.ts
@@ -0,0 +1,38 @@
+import type { Config } from 'tailwindcss'
+
+export default {
+  content: ['./index.html', './src/**/*.{ts,tsx}'],
+  theme: {
+    extend: {
+      colors: {
+        accent: 'var(--accent)',
+        'accent-soft': 'var(--accent-soft)',
+        'bg-0': 'var(--bg-0)',
+        'bg-1': 'var(--bg-1)',
+        'bg-2': 'var(--bg-2)',
+        'bg-3': 'var(--bg-3)',
+        'bg-4': 'var(--bg-4)',
+        'bg-5': 'var(--bg-5)',
+        'ink-1': 'var(--ink-1)',
+        'ink-2': 'var(--ink-2)',
+        'ink-3': 'var(--ink-3)',
+        'ink-4': 'var(--ink-4)',
+        ok: 'var(--ok)',
+        warn: 'var(--warn)',
+        err: 'var(--err)',
+        info: 'var(--info)',
+        blue: 'var(--blue)',
+        purple: 'var(--purple)',
+      },
+      fontFamily: {
+        ui: ['Inter', 'system-ui', 'sans-serif'],
+        mono: ['"JetBrains Mono"', 'monospace'],
+        terminal: ['"Share Tech Mono"', 'monospace'],
+      },
+      minHeight: {
+        touch: '48px',
+      },
+    },
+  },
+  plugins: [],
+} satisfies Config