Vanilla JS (v3): Implement 3-pane layout, item fetching, reading, and testing

1 files changed, 177 insertions, 63 deletions

diff --git a/frontend-vanilla/src/style.css b/frontend-vanilla/src/style.css
index 3bcdbd0..a9c1c61 100644
--- a/frontend-vanilla/src/style.css
+++ b/frontend-vanilla/src/style.css
@@ -1,96 +1,210 @@
 :root {
-  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
   line-height: 1.5;
   font-weight: 400;
 
   color-scheme: light dark;
-  color: rgba(255, 255, 255, 0.87);
-  background-color: #242424;
+  --bg-color: #ffffff;
+  --text-color: #213547;
+  --sidebar-bg: #f8f9fa;
+  --border-color: #e9ecef;
+  --accent-color: #007bff;
+  --hover-color: #e2e6ea;
+  --sidebar-width: 250px;
+  --item-list-width: 350px;
+}
 
-  font-synthesis: none;
-  text-rendering: optimizeLegibility;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
+@media (prefers-color-scheme: dark) {
+  :root {
+    --bg-color: #1a1a1a;
+    --text-color: #e9ecef;
+    --sidebar-bg: #2d2d2d;
+    --border-color: #444;
+    --accent-color: #375a7f;
+    --hover-color: #3e3e3e;
+  }
 }
 
-a {
-  font-weight: 500;
-  color: #646cff;
-  text-decoration: inherit;
+body {
+  margin: 0;
+  color: var(--text-color);
+  background-color: var(--bg-color);
+  height: 100vh;
+  overflow: hidden;
 }
-a:hover {
-  color: #535bf2;
+
+#app {
+  height: 100%;
 }
 
-body {
+.layout {
+  display: flex;
+  height: 100%;
+}
+
+/* Sidebar */
+.sidebar {
+  width: var(--sidebar-width);
+  background-color: var(--sidebar-bg);
+  border-right: 1px solid var(--border-color);
+  display: flex;
+  flex-direction: column;
+}
+
+.sidebar-header {
+  padding: 1rem;
+  border-bottom: 1px solid var(--border-color);
+}
+
+.sidebar-header h2 {
   margin: 0;
+  font-size: 1.1rem;
+}
+
+.feed-list {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+  overflow-y: auto;
+  flex: 1;
+}
+
+.feed-link {
+  display: block;
+  padding: 0.5rem 1rem;
+  text-decoration: none;
+  color: var(--text-color);
+  font-size: 0.9rem;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.feed-item:hover {
+  background-color: var(--hover-color);
+}
+
+.feed-item.active {
+  background-color: var(--hover-color);
+  font-weight: bold;
+}
+
+/* Item List Pane */
+.item-list-pane {
+  width: var(--item-list-width);
+  border-right: 1px solid var(--border-color);
   display: flex;
-  place-items: center;
-  min-width: 320px;
-  min-height: 100vh;
+  flex-direction: column;
+  background-color: var(--bg-color);
 }
 
-h1 {
-  font-size: 3.2em;
-  line-height: 1.1;
+.top-bar {
+  padding: 0.75rem 1rem;
+  border-bottom: 1px solid var(--border-color);
 }
 
-#app {
-  max-width: 1280px;
-  margin: 0 auto;
-  padding: 2rem;
-  text-align: center;
+.top-bar h1 {
+  margin: 0;
+  font-size: 1rem;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
-.logo {
-  height: 6em;
-  padding: 1.5em;
-  will-change: filter;
-  transition: filter 300ms;
+.item-list-container {
+  flex: 1;
+  overflow-y: auto;
 }
-.logo:hover {
-  filter: drop-shadow(0 0 2em #646cffaa);
+
+.item-list {
+  list-style: none;
+  padding: 0;
+  margin: 0;
+}
+
+.item-row {
+  padding: 0.75rem 1rem;
+  border-bottom: 1px solid var(--border-color);
+  cursor: pointer;
+  transition: background 0.1s;
+}
+
+.item-row:hover {
+  background-color: var(--hover-color);
+}
+
+.item-row.active {
+  background-color: var(--hover-color);
+  border-left: 3px solid var(--accent-color);
 }
-.logo.vanilla:hover {
-  filter: drop-shadow(0 0 2em #3178c6aa);
+
+.item-row.read {
+  opacity: 0.6;
 }
 
-.card {
-  padding: 2em;
+.item-title {
+  font-weight: 600;
+  font-size: 0.95rem;
+  margin-bottom: 0.2rem;
+  line-height: 1.3;
 }
 
-.read-the-docs {
+.item-meta {
+  font-size: 0.8rem;
   color: #888;
 }
 
-button {
-  border-radius: 8px;
-  border: 1px solid transparent;
-  padding: 0.6em 1.2em;
-  font-size: 1em;
-  font-weight: 500;
-  font-family: inherit;
-  background-color: #1a1a1a;
-  cursor: pointer;
-  transition: border-color 0.25s;
+/* Item Detail Pane */
+.item-detail-pane {
+  flex: 1;
+  overflow-y: auto;
+  background-color: var(--bg-color);
 }
-button:hover {
-  border-color: #646cff;
+
+.item-detail-content {
+  max-width: 800px;
+  margin: 0 auto;
+  padding: 2rem;
 }
-button:focus,
-button:focus-visible {
-  outline: 4px auto -webkit-focus-ring-color;
+
+.item-detail header {
+  margin-bottom: 2rem;
+  border-bottom: 1px solid var(--border-color);
+  padding-bottom: 1rem;
 }
 
-@media (prefers-color-scheme: light) {
-  :root {
-    color: #213547;
-    background-color: #ffffff;
-  }
-  a:hover {
-    color: #747bff;
-  }
-  button {
-    background-color: #f9f9f9;
-  }
+.item-detail h1 {
+  font-size: 1.8rem;
+  margin: 0 0 0.5rem 0;
+}
+
+.item-detail h1 a {
+  color: var(--text-color);
+  text-decoration: none;
+}
+
+.full-content {
+  font-size: 1.1rem;
+  line-height: 1.6;
+}
+
+.full-content img {
+  max-width: 100%;
+  height: auto;
+}
+
+.empty-state {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  height: 100%;
+  color: #888;
+  font-size: 1.2rem;
 }
+
+.loading,
+.empty {
+  padding: 1rem;
+  text-align: center;
+  color: #888;
+}
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