diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 5ba0689..7884921 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -6,6 +6,10 @@ on:
     paths:
       - 'site/**'
       - '.github/workflows/docs.yml'
+  pull_request:
+    paths:
+      - 'site/**'
+      - '.github/workflows/docs.yml'
   workflow_dispatch:
 
 permissions:
@@ -13,9 +17,10 @@ permissions:
   pages: write
   id-token: write
 
+# Pull requests only build; each gets its own group so it never queues behind a deploy.
 concurrency:
-  group: pages
-  cancel-in-progress: false
+  group: ${{ github.event_name == 'pull_request' && format('docs-{0}', github.ref) || 'pages' }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 jobs:
   build:
@@ -34,16 +39,19 @@ jobs:
           cache: npm
           cache-dependency-path: site/package-lock.json
       - uses: actions/configure-pages@v6.0.0
+        if: github.event_name != 'pull_request'
       - run: npm ci
         working-directory: site
       - run: npm run build
         working-directory: site
       - uses: actions/upload-pages-artifact@v5.0.0
+        if: github.event_name != 'pull_request'
         with:
           path: site/.vitepress/dist
 
   deploy:
     needs: build
+    if: github.event_name != 'pull_request'
     runs-on: ubuntu-latest
     environment:
       name: github-pages
diff --git a/site/.vitepress/theme/HeroInstall.vue b/site/.vitepress/theme/HeroInstall.vue
index 190db6d..9711964 100644
--- a/site/.vitepress/theme/HeroInstall.vue
+++ b/site/.vitepress/theme/HeroInstall.vue
@@ -1,97 +1,93 @@
 <script setup lang="ts">
-import { ref } from 'vue'
-import { useData } from 'vitepress'
+import { computed, onMounted, ref } from 'vue'
+import { useData, withBase } from 'vitepress'
+
+type Platform = 'windows' | 'unix' | 'python'
 
 const { frontmatter } = useData()
+const selected = ref<Platform>('windows')
 const copied = ref(false)
 
+const choices = computed(() => [
+  { key: 'windows' as const, prompt: '>', label: frontmatter.value.install?.windowsLabel || 'Windows', command: frontmatter.value.install?.windows },
+  { key: 'unix' as const, prompt: '$', label: frontmatter.value.install?.unixLabel || 'Linux / macOS / Termux', command: frontmatter.value.install?.unix },
+  { key: 'python' as const, prompt: '$', label: frontmatter.value.install?.pythonLabel || 'Python (uv)', command: frontmatter.value.install?.python },
+])
+const active = computed(() => choices.value.find(c => c.key === selected.value) || choices.value[0])
+const moreLink = computed(() => withBase(frontmatter.value.install?.moreLink ?? '/installation'))
+
+// The page is prerendered with Windows selected; switch to the visitor's platform after hydration.
+onMounted(() => {
+  if (!/Windows/i.test(navigator.userAgent)) selected.value = 'unix'
+})
+
+function select(key: Platform) {
+  selected.value = key
+  copied.value = false
+}
+
 async function copy() {
+  if (!active.value?.command) return
   try {
-    await navigator.clipboard.writeText(frontmatter.value.install.command)
+    await navigator.clipboard.writeText(active.value.command)
     copied.value = true
     setTimeout(() => (copied.value = false), 1600)
   } catch {
-    // Clipboard access can be blocked; the command stays selectable.
+    // Clipboard permissions vary by browser; the command remains selectable.
   }
 }
 </script>
 
 <template>
-  <div v-if="frontmatter.install" class="install">
-    <span class="install-label">{{ frontmatter.install.label }}</span>
-    <code class="install-command"><span class="prompt">$</span> {{ frontmatter.install.command }}</code>
-    <button class="install-copy" type="button" :aria-label="frontmatter.install.copy" @click="copy">
-      {{ copied ? frontmatter.install.copied : frontmatter.install.copy }}
-    </button>
+  <div v-if="frontmatter.install" class="installer">
+    <div class="installer-heading">{{ frontmatter.install.label }}</div>
+    <div class="installer-tabs" role="group" :aria-label="frontmatter.install.label">
+      <button
+        v-for="choice in choices"
+        :key="choice.key"
+        type="button"
+        class="installer-tab"
+        :class="{ active: selected === choice.key }"
+        :aria-pressed="selected === choice.key"
+        @click="select(choice.key)"
+      >{{ choice.label }}</button>
+    </div>
+    <div class="installer-command">
+      <code><span class="prompt">{{ active.prompt }}</span> {{ active.command }}</code>
+      <button type="button" class="installer-copy" @click="copy">
+        {{ copied ? frontmatter.install.copied : frontmatter.install.copy }}
+      </button>
+      <span class="visually-hidden" aria-live="polite">{{ copied ? frontmatter.install.copied : '' }}</span>
+    </div>
+    <a class="installer-more" :href="moreLink">{{ frontmatter.install.moreLabel }} →</a>
   </div>
 </template>
 
 <style scoped>
-.install {
-  display: flex;
-  align-items: center;
-  gap: 12px;
-  box-sizing: border-box;
-  width: 100%;
-  max-width: 420px;
-  margin-top: 28px;
-  padding: 8px 8px 8px 14px;
-  border: 1px solid var(--vp-c-divider);
-  border-radius: 10px;
-  background: var(--vp-c-bg-elv);
-}
-
-.install-label {
-  flex: none;
-  font-size: 12px;
-  font-weight: 600;
-  letter-spacing: 0.04em;
-  text-transform: uppercase;
-  color: var(--vp-c-text-3);
-}
-
-.install-command {
-  flex: 1;
-  min-width: 0;
-  overflow-x: auto;
-  white-space: nowrap;
-  font-family: var(--vp-font-family-mono);
-  font-size: 14px;
-  color: var(--vp-c-text-1);
-  background: none;
+.installer { width: 100%; max-width: 580px; margin-top: 26px; }
+.installer-heading { margin-bottom: 10px; font-size: 13px; font-weight: 600; color: var(--vp-c-text-2); }
+.installer-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
+.installer-tab {
+  padding: 5px 10px; border: 1px solid var(--vp-c-divider); border-radius: 7px;
+  font-size: 12px; line-height: 1.6; color: var(--vp-c-text-2); background: var(--vp-c-bg-elv);
 }
-
-.prompt {
-  color: var(--vp-c-brand-1);
-  user-select: none;
+.installer-tab:hover { border-color: var(--vp-c-brand-2); }
+.installer-tab.active { color: var(--vp-c-brand-1); border-color: var(--vp-c-brand-1); background: var(--vp-c-brand-soft); }
+.installer-command {
+  display: flex; align-items: center; gap: 10px; padding: 12px;
+  border: 1px solid var(--vp-c-divider); border-radius: 9px;
+  background: var(--vp-code-block-bg);
 }
-
-.install-copy {
-  flex: none;
-  padding: 4px 12px;
-  border: 1px solid var(--vp-c-divider);
-  border-radius: 6px;
-  font-size: 13px;
-  font-weight: 500;
-  color: var(--vp-c-text-2);
-  transition: border-color 0.2s, color 0.2s;
+.installer-command code {
+  flex: 1; min-width: 0; overflow-x: auto; white-space: nowrap;
+  font-size: 12px; line-height: 1.6; color: var(--vp-c-text-1);
 }
-
-.install-copy:hover {
-  border-color: var(--vp-c-brand-1);
-  color: var(--vp-c-brand-1);
-}
-
-@media (min-width: 640px) {
-  .install {
-    margin-top: 32px;
-  }
-}
-
-@media (max-width: 960px) {
-  .install {
-    margin-left: auto;
-    margin-right: auto;
-  }
+.prompt { color: var(--vp-c-brand-1); user-select: none; }
+.installer-copy {
+  flex: none; padding: 5px 10px; border: 1px solid var(--vp-c-divider);
+  border-radius: 6px; font-size: 12px; font-weight: 600; color: var(--vp-c-text-2);
 }
+.installer-copy:hover { color: var(--vp-c-brand-1); border-color: var(--vp-c-brand-1); }
+.installer-more { display: inline-block; margin-top: 9px; font-size: 12px; color: var(--vp-c-brand-1); }
+@media (max-width: 959px) { .installer { margin-left: auto; margin-right: auto; } }
 </style>
diff --git a/site/.vitepress/theme/style.css b/site/.vitepress/theme/style.css
index 596421c..ca9d06f 100644
--- a/site/.vitepress/theme/style.css
+++ b/site/.vitepress/theme/style.css
@@ -94,6 +94,12 @@
   max-width: 560px;
 }
 
+/* Korean wraps between words, not between syllables. */
+:lang(ko) .VPHome {
+  word-break: keep-all;
+  overflow-wrap: break-word;
+}
+
 /* Hero: a tinted band in the accent colour, demo in the right column on wide screens. */
 .VPHome {
   overflow-x: clip;
diff --git a/site/index.md b/site/index.md
index 7a23729..3cdaa37 100644
--- a/site/index.md
+++ b/site/index.md
@@ -19,10 +19,17 @@ hero:
       link: https://github.com/NaNIsaac/codigest
 
 install:
-  label: Install
-  command: uv tool install codigest
+  label: Install Codigest
+  windowsLabel: Windows
+  unixLabel: Linux / macOS / Termux
+  pythonLabel: Python (uv)
+  windows: 'irm https://raw.githubusercontent.com/NaNIsaac/codigest/main/install.ps1 | iex'
+  unix: 'curl -fsSL https://raw.githubusercontent.com/NaNIsaac/codigest/main/install.sh | sh'
+  python: 'uv tool install codigest'
   copy: Copy
   copied: Copied
+  moreLabel: All installation options
+  moreLink: /installation
 
 demo:
   alt: cdg cap runs a failing pytest, then cdg pack bundles the failure, the test file it names and the changed file
diff --git a/site/ko/index.md b/site/ko/index.md
index be3cb1c..cb49977 100644
--- a/site/ko/index.md
+++ b/site/ko/index.md
@@ -19,10 +19,17 @@ hero:
       link: https://github.com/NaNIsaac/codigest
 
 install:
-  label: 설치
-  command: uv tool install codigest
+  label: Codigest 설치
+  windowsLabel: Windows
+  unixLabel: Linux / macOS / Termux
+  pythonLabel: Python (uv)
+  windows: 'irm https://raw.githubusercontent.com/NaNIsaac/codigest/main/install.ps1 | iex'
+  unix: 'curl -fsSL https://raw.githubusercontent.com/NaNIsaac/codigest/main/install.sh | sh'
+  python: 'uv tool install codigest'
   copy: 복사
   copied: 복사됨
+  moreLabel: 설치 방법 자세히 보기
+  moreLink: /ko/installation
 
 demo:
   alt: cdg cap으로 실패하는 pytest를 실행한 뒤, cdg pack이 실패 출력과 오류가 가리키는 테스트 파일, 바뀐 파일을 묶는 화면