docs: add CUDA optimization learning materials and improve site styling

- Add new docs: cuda-memory-cheatsheet, optimization-playbook, performance-casebook
- Add Chinese translations for all new documentation
- Remove build artifact (sgemm_benchmark) from version control
- Enhance site styling and JavaScript functionality

Author: LessUp

.github/workflows/pages.yml

@@ -6,7 +6,7 @@ name: Deploy to GitHub Pages
 on:
   push:
     branches: [master]
-    paths:
+    paths: &pages_paths
       - 'CHANGELOG.md'
       - 'CONTRIBUTING.md'
       - 'index.md'
@@ -18,12 +18,13 @@ on:
       - 'assets/**'
       - '_sass/**'
       - '.github/workflows/pages.yml'
+  pull_request:
+    branches: [master]
+    paths: *pages_paths
   workflow_dispatch:
 
 permissions:
   contents: read
-  pages: write
-  id-token: write
 
 concurrency:
   group: pages-${{ github.ref }}
@@ -46,11 +47,16 @@ jobs:
           destination: ./_site
 
       - name: Upload artifact
+        if: github.event_name != 'pull_request'
         uses: actions/upload-pages-artifact@v3
         with:
           path: ./_site
 
   deploy:
+    if: github.event_name != 'pull_request'
+    permissions:
+      pages: write
+      id-token: write
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}

_includes/nav_footer_custom.html

@@ -2,7 +2,9 @@
      data-page-key="{{ page.page_key | default: 'unknown' }}"
      data-lang="{{ page.lang | default: 'en' }}"
      data-lang-ref="{{ page.lang_ref | default: '' }}">
-  <span class="language-switcher-label">Lang:</span>
+  <span class="language-switcher-label">
+    {% if page.lang == 'zh-CN' %}语言{% else %}Language{% endif %}:
+  </span>
   <button type="button" data-lang-choice="en"
           class="{% if page.lang == 'en' or page.lang == nil %}is-active{% endif %}">
     EN

_sass/custom/custom.scss

@@ -670,8 +670,7 @@ div.aux-nav {
 .language-switcher-label {
   color: var(--text-muted);
   font-size: 0.75rem;
-  text-transform: uppercase;
-  letter-spacing: 0.05em;
+  letter-spacing: 0.03em;
   margin-right: 0.25rem;
 }
 
@@ -707,3 +706,155 @@ div.aux-nav {
     margin: 1rem 0;
   }
 }
+
+
+// ============================================
+// HOMEPAGE UPGRADE LAYOUT
+// ============================================
+
+.home-shell {
+  padding: 0.5rem 0 1.5rem;
+}
+
+.home-hero-grid {
+  display: grid;
+  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
+  gap: 1.5rem;
+  padding: 1.5rem;
+  border: 1px solid var(--border-subtle);
+  border-radius: 16px;
+  background:
+    radial-gradient(circle at 8% 10%, rgba(118, 185, 0, 0.14), transparent 35%),
+    radial-gradient(circle at 85% 90%, rgba(0, 168, 232, 0.14), transparent 32%),
+    linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
+}
+
+.home-eyebrow {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4rem;
+  margin: 0 0 0.8rem;
+  padding: 0.3rem 0.7rem;
+  border-radius: 999px;
+  border: 1px solid rgba(118, 185, 0, 0.45);
+  background: rgba(118, 185, 0, 0.08);
+  color: var(--text-secondary);
+  font-size: 0.75rem;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+}
+
+.home-main-title {
+  margin: 0 0 0.7rem;
+  font-size: clamp(2rem, 4vw, 3rem);
+  line-height: 1.05;
+  font-weight: 800;
+  background: linear-gradient(90deg, var(--nvidia-green), var(--tech-teal));
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  background-clip: text;
+}
+
+.home-main-subtitle {
+  margin: 0;
+  max-width: 60ch;
+  color: var(--text-secondary);
+  font-size: 1.05rem;
+  line-height: 1.65;
+}
+
+.home-action-row {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.6rem;
+  margin-top: 1.25rem;
+}
+
+.signal-grid {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 0.8rem;
+}
+
+.signal-card {
+  border: 1px solid var(--border-subtle);
+  border-radius: 12px;
+  background: linear-gradient(160deg, var(--bg-secondary), var(--bg-tertiary));
+  padding: 0.9rem;
+}
+
+.signal-title {
+  color: var(--text-muted);
+  font-size: 0.78rem;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+.signal-value {
+  margin-top: 0.35rem;
+  color: var(--nvidia-green);
+  font-size: 1.35rem;
+  font-weight: 700;
+  line-height: 1.2;
+}
+
+.signal-note {
+  margin-top: 0.35rem;
+  color: var(--text-secondary);
+  font-size: 0.82rem;
+}
+
+.knowledge-grid {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 0.9rem;
+  margin: 1rem 0 1.4rem;
+}
+
+.knowledge-card {
+  display: block;
+  border: 1px solid var(--border-subtle);
+  border-radius: 14px;
+  padding: 1rem;
+  background: linear-gradient(160deg, var(--bg-secondary), var(--bg-primary));
+  text-decoration: none !important;
+  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
+
+  h3 {
+    margin: 0;
+    color: var(--text-primary);
+    font-size: 1.05rem;
+  }
+
+  p {
+    margin: 0.55rem 0 0;
+    color: var(--text-secondary);
+    font-size: 0.9rem;
+    line-height: 1.55;
+  }
+
+  &:hover {
+    transform: translateY(-2px);
+    border-color: var(--nvidia-green);
+    box-shadow: 0 10px 28px rgba(118, 185, 0, 0.14);
+  }
+}
+
+@media (max-width: 800px) {
+  .home-hero-grid {
+    grid-template-columns: 1fr;
+    padding: 1rem;
+  }
+
+  .signal-grid {
+    grid-template-columns: 1fr;
+  }
+
+  .knowledge-grid {
+    grid-template-columns: 1fr;
+  }
+
+  .home-main-subtitle {
+    font-size: 0.98rem;
+  }
+}