diff --git a/src/components/ui/AutocompleteInput.jsx b/src/components/ui/AutocompleteInput.jsx
index 93109df..330c0b5 100644
--- a/src/components/ui/AutocompleteInput.jsx
+++ b/src/components/ui/AutocompleteInput.jsx
@@ -38,7 +38,7 @@ export default function AutocompleteInput({ value, onChange, getSuggestions, id,
       <input
         type="text"
         id={id}
-        className="form-control"
+        className="input"
         role="combobox"
         aria-autocomplete="list"
         aria-expanded={showList}
diff --git a/src/components/ui/Badge.jsx b/src/components/ui/Badge.jsx
index dfbd866..6dff640 100644
--- a/src/components/ui/Badge.jsx
+++ b/src/components/ui/Badge.jsx
@@ -1,8 +1,7 @@
-export default function Badge({ tone = 'muted', dot = false, children, className = '', style }) {
-  return (
-    <span className={`badge badge-${tone} ${className}`} style={style}>
-      {dot && <span className="dot" />}
-      {children}
-    </span>
-  )
+import { badgeToneClass } from './tones'
+
+// "dot" bleibt als Prop erlaubt und wird ignoriert
+export default function Badge({ tone = 'muted', dot, className = '', style, children }) {
+  const cls = className ? `${badgeToneClass(tone)} ${className}` : badgeToneClass(tone)
+  return <span className={cls} style={style}>{children}</span>
 }
diff --git a/src/components/ui/Button.jsx b/src/components/ui/Button.jsx
index 51482cc..e897833 100644
--- a/src/components/ui/Button.jsx
+++ b/src/components/ui/Button.jsx
@@ -1,10 +1,6 @@
-const VARIANTS = {
-  default: 'ui-btn',
-  primary: 'ui-btn ui-btn-primary',
-  ghost: 'ui-btn ui-btn-ghost',
-  danger: 'ui-btn ui-btn-danger',
-}
+import { BUTTON_CLASSES } from './tones'
 
+// "size" bleibt als Prop erlaubt und wird ignoriert; ein Standard-"type" gibt es nicht
 export default function Button({
   variant = 'default',
   size,
@@ -13,7 +9,8 @@ export default function Button({
   children,
   ...props
 }) {
-  const cls = `${VARIANTS[variant] || VARIANTS.default}${size === 'sm' ? ' ui-btn-sm' : ''} ${className}`
+  const base = Object.prototype.hasOwnProperty.call(BUTTON_CLASSES, variant) ? BUTTON_CLASSES[variant] : BUTTON_CLASSES.default
+  const cls = className ? `${base} ${className}` : base
   const Comp = as
   return (
     <Comp className={cls} {...props}>
diff --git a/src/components/ui/Card.jsx b/src/components/ui/Card.jsx
index 8abfb62..eb4f582 100644
--- a/src/components/ui/Card.jsx
+++ b/src/components/ui/Card.jsx
@@ -1,18 +1,14 @@
-export default function Card({ title, actions, children, pad = true, className = '', bodyStyle, style }) {
-  if (!title && !actions) {
-    return (
-      <div className={`ui-card ${pad ? 'pad' : ''} ${className}`} style={style}>
-        {children}
-      </div>
-    )
-  }
+// "pad", "bodyStyle" und "style" bleiben als Props erlaubt und werden ignoriert
+export default function Card({ title, actions, className, children }) {
   return (
-    <div className={`ui-card ${className}`} style={style}>
-      <div className="ui-card-head">
-        <h3>{title}</h3>
-        {actions && <div className="flex gap-2 items-center">{actions}</div>}
-      </div>
-      <div className="ui-card-body" style={bodyStyle}>{children}</div>
-    </div>
+    <section className={className || undefined}>
+      {(title || actions) && (
+        <h2 className="section">
+          <span>{title}</span>
+          {actions && <span className="actions">{actions}</span>}
+        </h2>
+      )}
+      {children}
+    </section>
   )
 }
diff --git a/src/components/ui/DateTimeInput.jsx b/src/components/ui/DateTimeInput.jsx
index 39c62c7..f8cdcbd 100644
--- a/src/components/ui/DateTimeInput.jsx
+++ b/src/components/ui/DateTimeInput.jsx
@@ -15,7 +15,7 @@ export default function DateTimeInput({ id, date, time, onDateChange, onTimeChan
       <input
         id={id}
         type="date"
-        className="form-control"
+        className="input"
         min={min || undefined}
         required={required}
         value={date}
@@ -24,7 +24,7 @@ export default function DateTimeInput({ id, date, time, onDateChange, onTimeChan
       />
       <input
         type="time"
-        className="form-control"
+        className="input"
         aria-label={timeLabel}
         required={timeRequired}
         value={time}
diff --git a/src/components/ui/DurationSelect.jsx b/src/components/ui/DurationSelect.jsx
index e440921..060f5a0 100644
--- a/src/components/ui/DurationSelect.jsx
+++ b/src/components/ui/DurationSelect.jsx
@@ -5,7 +5,7 @@ export default function DurationSelect({ id, value, onChange, disabled }) {
   return (
     <select
       id={id}
-      className="form-control"
+      className="select"
       value={value}
       disabled={disabled}
       onChange={(e) => onChange(Number(e.target.value))}
diff --git a/src/components/ui/EmptyState.jsx b/src/components/ui/EmptyState.jsx
index bbdc627..d8c0857 100644
--- a/src/components/ui/EmptyState.jsx
+++ b/src/components/ui/EmptyState.jsx
@@ -1,10 +1,10 @@
+// "icon" bleibt als Prop erlaubt und wird ignoriert
 export default function EmptyState({ icon, title, hint, action }) {
   return (
     <div className="empty">
-      {icon && <div className="empty-icon">{icon}</div>}
-      <div style={{ fontWeight: 700, marginBottom: 4 }}>{title}</div>
-      {hint && <div className="faint" style={{ fontSize: 13 }}>{hint}</div>}
-      {action && <div style={{ marginTop: 16 }}>{action}</div>}
+      <strong>{title}</strong>
+      {hint}
+      {action && <div className="mt-2">{action}</div>}
     </div>
   )
 }
diff --git a/src/components/ui/Field.jsx b/src/components/ui/Field.jsx
index 036dc58..65e04b3 100644
--- a/src/components/ui/Field.jsx
+++ b/src/components/ui/Field.jsx
@@ -1,9 +1,9 @@
-export default function Field({ label, children, hint }) {
+export default function Field({ label, htmlFor, children, hint }) {
   return (
     <div className="field">
-      {label && <label>{label}</label>}
+      {label && <label htmlFor={htmlFor}>{label}</label>}
       {children}
-      {hint && <div className="faint" style={{ fontSize: 12 }}>{hint}</div>}
+      {hint && <div className="hint">{hint}</div>}
     </div>
   )
 }
diff --git a/src/components/ui/Kpi.jsx b/src/components/ui/Kpi.jsx
index 9391f41..d2b33d9 100644
--- a/src/components/ui/Kpi.jsx
+++ b/src/components/ui/Kpi.jsx
@@ -1,10 +1,6 @@
-export default function Kpi({ label, value, sub, icon, accent = 'var(--accent)' }) {
-  return (
-    <div className="kpi">
-      <span className="kpi-accent" style={{ background: accent }} />
-      <div className="kpi-label">{icon}{label}</div>
-      <div className="kpi-value">{value}</div>
-      {sub && <div className="kpi-sub">{sub}</div>}
-    </div>
-  )
+import Stat from './Stat'
+
+// Altname fuer Stat (wird in P7 geloescht); "icon" wird ignoriert, die Warnfarbe wird zu 'neg'
+export default function Kpi({ label, value, sub, icon, accent }) {
+  return <Stat label={label} value={value} sub={sub} tone={accent === 'var(--danger)' ? 'neg' : ''} />
 }
diff --git a/src/components/ui/PageHeader.jsx b/src/components/ui/PageHeader.jsx
index 50c98c0..43f531f 100644
--- a/src/components/ui/PageHeader.jsx
+++ b/src/components/ui/PageHeader.jsx
@@ -1,12 +1,29 @@
-export default function PageHeader({ title, subtitle, actions, children }) {
+import { Fragment } from 'react'
+import { Link } from 'react-router-dom'
+
+// crumb: [{ label, to? }] steht vor dem Kopf; Eintraege mit "to" sind Links, die anderen Text
+export default function PageHeader({ title, subtitle, actions, eyebrow, crumb, children }) {
   return (
-    <div className="page-header">
-      <div>
-        <h1 className="page-title">{title}</h1>
-        {subtitle && <div className="page-subtitle">{subtitle}</div>}
-        {children}
+    <>
+      {crumb && crumb.length > 0 && (
+        <nav className="crumb" aria-label="Brotkrumen">
+          {crumb.map((c, i) => (
+            <Fragment key={i}>
+              {i > 0 && <span className="faint">/</span>}
+              {c.to ? <Link to={c.to}>{c.label}</Link> : <span>{c.label}</span>}
+            </Fragment>
+          ))}
+        </nav>
+      )}
+      <div className="page-head">
+        <div>
+          {eyebrow && <div className="eyebrow">{eyebrow}</div>}
+          <h1>{title}</h1>
+          {subtitle && <div className="sub">{subtitle}</div>}
+          {children}
+        </div>
+        {actions && <div className="actions">{actions}</div>}
       </div>
-      {actions && <div className="page-actions">{actions}</div>}
-    </div>
+    </>
   )
 }
diff --git a/src/components/ui/Stat.jsx b/src/components/ui/Stat.jsx
new file mode 100644
index 0000000..ce57666
--- /dev/null
+++ b/src/components/ui/Stat.jsx
@@ -0,0 +1,10 @@
+// Kennzahl: Beschriftung, Wert, Zusatzzeile; tone '' | 'warn' | 'neg'. Der Container .stats kommt vom Aufrufer.
+export default function Stat({ label, value, sub, tone = '' }) {
+  return (
+    <div className="stat">
+      <div className="k">{label}</div>
+      <div className={tone ? `v ${tone}` : 'v'}>{value}</div>
+      {sub && <div className="sub">{sub}</div>}
+    </div>
+  )
+}
diff --git a/src/components/ui/StatusPill.jsx b/src/components/ui/StatusPill.jsx
index 27cb9c1..f55a3a6 100644
--- a/src/components/ui/StatusPill.jsx
+++ b/src/components/ui/StatusPill.jsx
@@ -1,21 +1,12 @@
-import { statusLabel, statusClass, isUrgent } from '../../lib/ticketStatus'
-
-const pillBase = {
-  display: 'inline-flex',
-  alignItems: 'center',
-  gap: 6,
-  padding: '3px 10px',
-  borderRadius: 999,
-  fontSize: 12,
-  fontWeight: 700,
-}
+import { statusLabel, statusTone, isUrgent } from '../../lib/ticketStatus'
 
 export function StatusPill({ status }) {
-  return <span className={statusClass(status)} style={pillBase}>{statusLabel(status)}</span>
+  const tone = statusTone(status)
+  return <span className={tone ? `badge ${tone}` : 'badge'}>{statusLabel(status)}</span>
 }
 
 // Nur dringende Tickets bekommen ein Abzeichen
 export function UrgentPill({ priority }) {
   if (!isUrgent(priority)) return null
-  return <span className="priority-critical" style={pillBase}>Dringend</span>
+  return <span className="badge red">Dringend</span>
 }
diff --git a/src/components/ui/Tabs.jsx b/src/components/ui/Tabs.jsx
index 2fc5793..ead80bf 100644
--- a/src/components/ui/Tabs.jsx
+++ b/src/components/ui/Tabs.jsx
@@ -1,14 +1,17 @@
 export default function Tabs({ tabs, active, onChange }) {
   return (
-    <div className="ticket-tabs">
+    <div className="tabs" role="tablist">
       {tabs.map((t) => (
         <button
           key={t.id}
           type="button"
-          className={`ticket-tab ${active === t.id ? 'ticket-tab-active' : ''}`}
+          role="tab"
+          aria-selected={active === t.id}
+          className={active === t.id ? 'tab active' : 'tab'}
           onClick={() => onChange(t.id)}
         >
           {t.label}
+          {t.count != null && <span className="count">{t.count}</span>}
         </button>
       ))}
     </div>
diff --git a/src/components/ui/index.js b/src/components/ui/index.js
index 450ce02..f6da960 100644
--- a/src/components/ui/index.js
+++ b/src/components/ui/index.js
@@ -6,6 +6,7 @@ export { StatusPill, UrgentPill } from './StatusPill'
 export { default as Tabs } from './Tabs'
 export { default as EmptyState } from './EmptyState'
 export { default as Field } from './Field'
+export { default as Stat } from './Stat'
 export { default as Kpi } from './Kpi'
 export { default as AutocompleteInput } from './AutocompleteInput'
 export { default as DateTimeInput } from './DateTimeInput'
diff --git a/src/components/ui/tones.js b/src/components/ui/tones.js
new file mode 100644
index 0000000..a4e271b
--- /dev/null
+++ b/src/components/ui/tones.js
@@ -0,0 +1,28 @@
+/* Klassen der Bausteine: reine Zuordnung, ohne JSX (Test: tests/unit/uiTones.test.mjs) */
+
+// Badge-Ton (alter und neuer Name) auf die Klasse; "muted"/"grey" und alles Unbekannte = neutral
+const BADGE_TONES = {
+  info: 'blue',
+  blue: 'blue',
+  ok: 'green',
+  green: 'green',
+  warn: 'orange',
+  orange: 'orange',
+  danger: 'red',
+  red: 'red',
+  violet: 'violet',
+  plain: 'plain',
+}
+
+export function badgeToneClass(tone) {
+  const t = Object.prototype.hasOwnProperty.call(BADGE_TONES, tone) ? BADGE_TONES[tone] : ''
+  return t ? `badge ${t}` : 'badge'
+}
+
+export const BUTTON_CLASSES = {
+  default: 'btn',
+  ghost: 'btn',
+  primary: 'btn btn-primary',
+  quiet: 'btn btn-quiet',
+  danger: 'link-danger',
+}
diff --git a/tests/unit/uiTones.test.mjs b/tests/unit/uiTones.test.mjs
new file mode 100644
index 0000000..6a1544a
--- /dev/null
+++ b/tests/unit/uiTones.test.mjs
@@ -0,0 +1,20 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { loadModule } from './load.mjs'
+
+const { badgeToneClass, BUTTON_CLASSES } = await loadModule('src/components/ui/tones.js')
+
+test('badgeToneClass', () => {
+  for (const t of ['muted', 'grey', undefined, 'unbekannt']) assert.equal(badgeToneClass(t), 'badge')
+  assert.equal(badgeToneClass('info'), 'badge blue')
+  assert.equal(badgeToneClass('blue'), 'badge blue')
+  assert.equal(badgeToneClass('ok'), 'badge green')
+  assert.equal(badgeToneClass('warn'), 'badge orange')
+  assert.equal(badgeToneClass('danger'), 'badge red')
+  assert.equal(badgeToneClass('violet'), 'badge violet')
+  assert.equal(badgeToneClass('plain'), 'badge plain')
+})
+
+test('Button-Varianten', () => {
+  assert.deepEqual(BUTTON_CLASSES, { default: 'btn', ghost: 'btn', primary: 'btn btn-primary', quiet: 'btn btn-quiet', danger: 'link-danger' })
+})