diff --git a/frontend/src/components/LanguageSelect.vue b/frontend/src/components/LanguageSelect.vue
index 50fa6f6..d3d4f94 100644
--- a/frontend/src/components/LanguageSelect.vue
+++ b/frontend/src/components/LanguageSelect.vue
@@ -10,12 +10,14 @@ const options = [
 function select(code: string) {
   modelValue.value = code
 }
+
+const hintId = 'language-hint'
 </script>
 
 <template>
-  <div>
-    <h2>Sprache auswählen</h2>
-    <p class="hint">Interface-Sprache für Fragen und Optionen</p>
+  <section aria-labelledby="language-title" aria-describedby="language-hint" role="radiogroup">
+    <h2 id="language-title">Sprache auswählen</h2>
+    <p :id="hintId" class="hint">Interface-Sprache für Fragen und Optionen</p>
     <div class="grid">
       <button
         v-for="opt in options"
@@ -23,12 +25,15 @@ function select(code: string) {
         type="button"
         class="lang-btn"
         :class="{ active: opt.code === modelValue }"
+        role="radio"
+        :aria-checked="opt.code === modelValue"
+        :aria-label="opt.label"
         @click="select(opt.code)"
       >
-        {{ opt.label }}
+        <span class="label">{{ opt.label }}</span>
       </button>
     </div>
-  </div>
+  </section>
 </template>
 
 <style scoped>
@@ -39,7 +44,7 @@ h2 {
 
 .hint {
   font-size: 0.8rem;
-  color: #9ca3af;
+  color: #6b7280;
   margin-bottom: 0.75rem;
 }
 
@@ -52,7 +57,7 @@ h2 {
 .lang-btn {
   padding: 0.55rem 0.5rem;
   border-radius: 999px;
-  border: 1px solid #e5e7eb;
+  border: 1px solid #d1d5db;
   background: #f9fafb;
   font-size: 0.85rem;
   color: #111827;
@@ -67,8 +72,17 @@ h2 {
 
 .lang-btn.active {
   background: #e5f0ff;
-  border-color: #3b82f6;
+  border-color: #2563eb;
   color: #0b1f4a;
-  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.2);
+  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.35);
+}
+
+.lang-btn:focus-visible {
+  outline: 3px solid #2563eb;
+  outline-offset: 2px;
+}
+
+.label {
+  display: inline-block;
 }
 </style>
diff --git a/frontend/src/components/PainSlider.vue b/frontend/src/components/PainSlider.vue
index 0124273..bec0c25 100644
--- a/frontend/src/components/PainSlider.vue
+++ b/frontend/src/components/PainSlider.vue
@@ -7,6 +7,9 @@ const props = defineProps<{
   max: number
 }>()
 
+const sliderId = 'pain-slider'
+const labelId = 'pain-title'
+
 function onInput(ev: Event) {
   const target = ev.target as HTMLInputElement
   modelValue.value = Number(target.value)
@@ -14,21 +17,26 @@ function onInput(ev: Event) {
 </script>
 
 <template>
-  <div>
-    <h2>{{ props.title }}</h2>
+  <section>
+    <h2 :id="labelId">{{ props.title }}</h2>
     <div class="value">{{ modelValue }}</div>
     <input
+      :id="sliderId"
       type="range"
       :min="props.min"
       :max="props.max"
       :value="modelValue"
+      :aria-labelledby="labelId"
+      :aria-valuemin="props.min"
+      :aria-valuemax="props.max"
+      :aria-valuenow="modelValue"
       @input="onInput"
     />
     <div class="scale">
       <span>{{ props.min }}</span>
       <span>{{ props.max }}</span>
     </div>
-  </div>
+  </section>
 </template>
 
 <style scoped>
@@ -54,6 +62,11 @@ input[type='range'] {
   outline: none;
 }
 
+input[type='range']:focus-visible {
+  outline: 3px solid #2563eb;
+  outline-offset: 4px;
+}
+
 input[type='range']::-webkit-slider-thumb {
   -webkit-appearance: none;
   appearance: none;
diff --git a/frontend/src/components/SymptomSelector.vue b/frontend/src/components/SymptomSelector.vue
index 62cf740..ed414c9 100644
--- a/frontend/src/components/SymptomSelector.vue
+++ b/frontend/src/components/SymptomSelector.vue
@@ -18,8 +18,9 @@ function select(value: string) {
 </script>
 
 <template>
-  <div>
-    <h2>{{ props.title }}</h2>
+  <section class="symptom-section" aria-labelledby="symptom-title" role="radiogroup">
+    <h2 id="symptom-title">{{ props.title }}</h2>
+    <p class="sr-only">Bitte wählen Sie genau eine Option aus.</p>
     <div class="grid">
       <button
         v-for="opt in props.options"
@@ -27,18 +28,24 @@ function select(value: string) {
         type="button"
         class="symptom-btn"
         :class="{ active: opt.value === modelValue }"
+        role="radio"
+        :aria-checked="opt.value === modelValue"
         @click="select(opt.value)"
       >
-        <span class="icon-wrapper" v-if="opt.icon">
+        <span v-if="opt.icon" class="icon-wrapper">
           <img :src="opt.icon" :alt="opt.label" class="icon" />
         </span>
         <span class="label">{{ opt.label }}</span>
       </button>
     </div>
-  </div>
+  </section>
 </template>
 
 <style scoped>
+.symptom-section {
+  display: block;
+}
+
 h2 {
   font-size: 1rem;
   margin-bottom: 0.75rem;
@@ -53,7 +60,7 @@ h2 {
 .symptom-btn {
   padding: 0.75rem 0.75rem;
   border-radius: 18px;
-  border: 1px solid #e5e7eb;
+  border: 1px solid #d1d5db;
   background: #f9fafb;
   text-align: left;
   font-size: 0.95rem;
@@ -66,6 +73,22 @@ h2 {
     transform 0.08s ease-out;
 }
 
+.symptom-btn:hover {
+  background: #f3f4f6;
+}
+
+.symptom-btn.active {
+  background: linear-gradient(145deg, #16a34a, #15803d);
+  border-color: #15803d;
+  color: #ffffff;
+  box-shadow: 0 10px 20px rgba(22, 163, 74, 0.4);
+}
+
+.symptom-btn:focus-visible {
+  outline: 3px solid #2563eb;
+  outline-offset: 2px;
+}
+
 .icon-wrapper {
   flex-shrink: 0;
   width: 44px;
@@ -84,14 +107,15 @@ h2 {
   flex: 1;
 }
 
-.symptom-btn:hover {
-  background: #f3f4f6;
-}
-
-.symptom-btn.active {
-  background: linear-gradient(145deg, #22c55e, #16a34a);
-  border-color: #16a34a;
-  color: #ffffff;
-  box-shadow: 0 10px 20px rgba(34, 197, 94, 0.35);
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
 }
 </style>
diff --git a/frontend/src/views/LanguageView.vue b/frontend/src/views/LanguageView.vue
index 2fca9b5..6fa6f77 100644
--- a/frontend/src/views/LanguageView.vue
+++ b/frontend/src/views/LanguageView.vue
@@ -7,6 +7,14 @@ import { useRouter } from 'vue-router'
 const router = useRouter()
 const { language, isLoadingConfig, loadError, loadQuestions } = useTriageSession()
 
+watch(
+  () => language.value,
+  (val) => {
+    document.documentElement.lang = val
+  },
+  { immediate: true },
+)
+
 watch(
   () => language.value,
   () => {