feat: Implement separate home and battery screens

src/App.tsx

@@ -3,16 +3,14 @@ import type { ChargingSession } from "./types";
 import { fetchSessions } from "./api";
 
 type LoadState = "idle" | "loading" | "success" | "error";
+type Screen = "home" | "battery";
 
 const App: React.FC = () => {
+  const [screen, setScreen] = useState<Screen>("home");
   const [sessions, setSessions] = useState<ChargingSession[]>([]);
   const [loadState, setLoadState] = useState<LoadState>("idle");
   const [errorMessage, setErrorMessage] = useState<string | null>(null);
 
-  const [activeTab] = useState<"home" | "battery" | "trips" | "settings">(
-    "battery"
-  );
-
   useEffect(() => {
     const load = async () => {
       setLoadState("loading");
@@ -21,7 +19,8 @@ const App: React.FC = () => {
       try {
         const { sessions } = await fetchSessions(30);
         const sorted = [...sessions].sort(
-          (a, b) => new Date(b.endedAt).getTime() - new Date(a.endedAt).getTime()
+          (a, b) =>
+            new Date(b.endedAt).getTime() - new Date(a.endedAt).getTime()
         );
         setSessions(sorted);
         setLoadState("success");
@@ -43,24 +42,40 @@ const App: React.FC = () => {
     return latestSession.sohEnd - previousSession.sohEnd;
   }, [latestSession, previousSession]);
 
-  const sohTrendPoints = useMemo(() => {
-    return sessions
-      .slice()
-      .reverse()
-      .map((s) => ({
-        label: new Date(s.endedAt).toLocaleDateString(undefined, {
-          month: "short",
-          day: "numeric",
-        }),
-        value: (s.sohStart + s.sohEnd) / 2,
-      }));
-  }, [sessions]);
-
   const now = new Date();
 
   return (
-    <div className="screen">
+    <div
-      {/* STATUS BAR – topmost, like Android Auto / CarPlay */}
+      className={`screen ${
+        screen === "battery" ? "screen-battery-enter" : "screen-home-enter"
+      }`}
+    >
+      <StatusBar now={now} />
+      {screen === "home" ? (
+        <HomeScreen onOpenBattery={() => setScreen("battery")} />
+      ) : (
+        <BatteryScreen
+          sessions={sessions}
+          loadState={loadState}
+          errorMessage={errorMessage}
+          latestSession={latestSession}
+          sohChange={sohChange}
+        />
+      )}
+      {screen === "battery" && (
+        <BottomNav current={screen} onChange={setScreen} />
+      )}
+    </div>
+  );
+};
+
+/* ---------- STATUS BAR ---------- */
+
+interface StatusBarProps {
+  now: Date;
+}
+
+const StatusBar: React.FC<StatusBarProps> = ({ now }) => (
   <div className="status-bar">
     <div className="status-left">
       <span className="status-time">
@@ -83,46 +98,125 @@ const App: React.FC = () => {
       <span className="status-icon">🔊</span>
     </div>
   </div>
+);
 
-      {/* APP HEADER */}
+/* ---------- HOME SCREEN ---------- */
+
+interface HomeScreenProps {
+  onOpenBattery: () => void;
+}
+
+const HomeScreen: React.FC<HomeScreenProps> = ({ onOpenBattery }) => {
+  return (
+    <>
+      <header className="top-bar">
+        <div className="top-bar-left">
+          <span className="brand">Car Menu</span>
+          <span className="subtitle">Select a function</span>
+        </div>
+      </header>
+
+      {/* HOME CONTENT: VW-style icon grid */}
+      <main className="home-menu-content">
+        <div className="home-menu-grid">
+          {/* Row 1 */}
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">📻</span>
+            <span className="home-menu-label">Radio</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">🎵</span>
+            <span className="home-menu-label">Media</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">🔗</span>
+            <span className="home-menu-label">App Connect</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">❄️</span>
+            <span className="home-menu-label">Climate</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">📞</span>
+            <span className="home-menu-label">Devices</span>
+          </button>
+
+          <button
+            className="home-menu-tile home-menu-tile-battery"
+            onClick={onOpenBattery}
+          >
+            <span className="home-menu-icon">🔋</span>
+            <span className="home-menu-label">Battery</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">🚗</span>
+            <span className="home-menu-label">Car</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">🖼️</span>
+            <span className="home-menu-label">Images</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">🔊</span>
+            <span className="home-menu-label">Sound</span>
+          </button>
+
+          <button className="home-menu-tile">
+            <span className="home-menu-icon">⚙️</span>
+            <span className="home-menu-label">Settings</span>
+          </button>
+        </div>
+      </main>
+    </>
+  );
+};
+
+/* ---------- BATTERY SCREEN (existing screen) ---------- */
+
+interface BatteryScreenProps {
+  sessions: ChargingSession[];
+  loadState: LoadState;
+  errorMessage: string | null;
+  latestSession: ChargingSession | null;
+  sohChange: number | null;
+}
+
+const BatteryScreen: React.FC<BatteryScreenProps> = ({
+  sessions,
+  loadState,
+  errorMessage,
+  latestSession,
+  sohChange,
+}) => {
+  const sohTrendPoints = useMemo(() => {
+    return sessions
+      .slice()
+      .reverse()
+      .map((s) => ({
+        label: new Date(s.endedAt).toLocaleDateString(undefined, {
+          month: "short",
+          day: "numeric",
+        }),
+        value: (s.sohStart + s.sohEnd) / 2,
+      }));
+  }, [sessions]);
+
+  return (
+    <>
       <header className="top-bar">
         <div className="top-bar-left">
           <span className="brand">Battery Health</span>
           <span className="subtitle">Last 30 days</span>
         </div>
-        <div className="top-bar-right">
-          <span className="status-dot" />
-          <span className="status-label">
-            {loadState === "loading"
-              ? "Syncing…"
-              : loadState === "error"
-              ? "Offline"
-              : "Connected"}
-          </span>
-        </div>
       </header>
 
-      {/* QUICK CONTROL STRIP – static toggles to feel “car-like” */}
-      <div className="quick-strip">
-        <button className="quick-btn quick-btn-active">
-          <span className="quick-icon">❄️</span>
-          <span className="quick-label">AC Auto</span>
-        </button>
-        <button className="quick-btn">
-          <span className="quick-icon">🔥</span>
-          <span className="quick-label">Seat</span>
-        </button>
-        <button className="quick-btn">
-          <span className="quick-icon">🌙</span>
-          <span className="quick-label">Night</span>
-        </button>
-        <button className="quick-btn">
-          <span className="quick-icon">⚡</span>
-          <span className="quick-label">Eco</span>
-        </button>
-      </div>
-
-      {/* MAIN CONTENT */}
       {loadState === "loading" && (
         <div className="center-message">Loading charging history…</div>
       )}
@@ -156,14 +250,16 @@ const App: React.FC = () => {
                 <span className="value">
                   {latestSession ? latestSession.sohEnd.toFixed(1) : "--"}%
                 </span>
+                {latestSession && (
                   <span className="secondary">
                     Session ended{" "}
-                  {new Date(latestSession!.endedAt).toLocaleString(undefined, {
+                    {new Date(latestSession.endedAt).toLocaleString(undefined, {
                       weekday: "short",
                       hour: "2-digit",
                       minute: "2-digit",
                     })}
                   </span>
+                )}
               </div>
 
               <div className="soh-change">
@@ -254,9 +350,7 @@ const App: React.FC = () => {
               {sessions.map((session, index) => {
                 const prev = sessions[index + 1];
                 const delta =
-                  prev != null
+                  prev != null ? session.sohEnd - prev.sohEnd : undefined;
-                    ? session.sohEnd - prev.sohEnd
-                    : undefined;
 
                 return (
                   <SessionRow
@@ -270,47 +364,52 @@ const App: React.FC = () => {
           </section>
         </main>
       )}
+    </>
+  );
+};
 
-      {/* BOTTOM NAV – static icons / labels */}
+/* ---------- BOTTOM NAV ---------- */
+
+interface BottomNavProps {
+  current: Screen;
+  onChange: (screen: Screen) => void;
+}
+
+const BottomNav: React.FC<BottomNavProps> = ({ current, onChange }) => {
+  return (
     <nav className="bottom-nav">
       <button
         className={
-            "nav-button " + (activeTab === "home" ? "nav-button-active" : "")
+          "nav-button " + (current === "home" ? "nav-button-active" : "")
         }
+        onClick={() => onChange("home")}
       >
         <span className="nav-icon">🏠</span>
         <span className="nav-label">Home</span>
       </button>
       <button
         className={
-            "nav-button " + (activeTab === "battery" ? "nav-button-active" : "")
+          "nav-button " + (current === "battery" ? "nav-button-active" : "")
         }
+        onClick={() => onChange("battery")}
       >
-          <span className="nav-icon">🔋</span>
+        <span className="nav-icon">🚗</span>
-          <span className="nav-label">Battery</span>
+        <span className="nav-label">Car</span>
       </button>
-        <button
+      <button className="nav-button">
-          className={
-            "nav-button " + (activeTab === "trips" ? "nav-button-active" : "")
-          }
-        >
         <span className="nav-icon">🗺️</span>
-          <span className="nav-label">Trips</span>
+        <span className="nav-label">Navigation</span>
       </button>
-        <button
+      <button className="nav-button">
-          className={
-            "nav-button " +
-            (activeTab === "settings" ? "nav-button-active" : "")
-          }
-        >
         <span className="nav-icon">⚙️</span>
         <span className="nav-label">Settings</span>
       </button>
     </nav>
-    </div>
   );
 };
 
+/* ---------- CHART + SESSION ROW (unchanged) ---------- */
+
 interface TrendPoint {
   label: string;
   value: number;
@@ -332,10 +431,7 @@ const SimpleTrendChart: React.FC<SimpleTrendChartProps> = ({ points }) => {
 
   const norm = (v: number) => {
     if (max === min) return 50;
-    return (
+    return padding + ((max - v) / (max - min)) * (100 - padding * 2);
-      padding +
-      ((max - v) / (max - min)) * (100 - padding * 2)
-    );
   };
 
   const stepX = points.length > 1 ? 100 / (points.length - 1) : 50;
@@ -350,7 +446,11 @@ const SimpleTrendChart: React.FC<SimpleTrendChartProps> = ({ points }) => {
 
   return (
     <div className="chart-wrapper">
-      <svg viewBox="0 0 100 100" className="chart-svg" preserveAspectRatio="none">
+      <svg
+        viewBox="0 0 100 100"
+        className="chart-svg"
+        preserveAspectRatio="none"
+      >
         <path d={pathD} className="chart-line" fill="none" />
         {points.map((p, i) => {
           const x = i * stepX;

src/styles.css

@@ -19,7 +19,6 @@ html,
 }
 
 /* MAIN SCREEN LAYOUT */
-
 .screen {
     width: 100%;
     height: 100%;
@@ -30,7 +29,6 @@ html,
     padding: 4px 16px 8px;
     gap: 8px;
 
-    /* whole screen scrolls */
     overflow-y: auto;
     -webkit-overflow-scrolling: touch;
 }
@@ -40,7 +38,6 @@ html,
     align-items: center;
     justify-content: space-between;
     margin-top: 2px;
-    /* small tweak */
 }
 
 .top-bar-left {
@@ -89,19 +86,16 @@ html,
     color: #ff453a;
 }
 
-/* CONTENT AREA – just layout, NO own scrolling now */
+/* CONTENT AREA */
-
 .content {
     display: grid;
     grid-template-rows: auto auto minmax(0, 1fr);
     gap: 10px;
 
-    /* small extra space above nav */
     padding-bottom: 12px;
 }
 
 /* PANELS */
-
 .panel {
     background: rgba(9, 11, 22, 0.9);
     border-radius: 16px;
@@ -133,7 +127,6 @@ html,
 }
 
 /* CURRENT SOH SECTION */
-
 .current-soh-row {
     display: flex;
     justify-content: space-between;
@@ -215,7 +208,6 @@ html,
 }
 
 /* Chart */
-
 .panel-chart {
     display: flex;
     flex-direction: column;
@@ -262,7 +254,6 @@ html,
     min-height: 0;
 }
 
-/* IMPORTANT: remove its own scrolling, let whole screen handle it */
 .session-list {
     margin-top: 6px;
     display: flex;
@@ -307,7 +298,6 @@ html,
 }
 
 /* STATUS BAR */
-
 .status-bar {
     display: flex;
     align-items: center;
@@ -354,41 +344,7 @@ html,
     opacity: 0.9;
 }
 
-/* QUICK STRIP */
-
-.quick-strip {
-    display: flex;
-    gap: 8px;
-    margin-bottom: 2px;
-}
-
-.quick-btn {
-    flex: 1;
-    border: none;
-    border-radius: 999px;
-    padding: 4px 8px;
-    background: rgba(21, 24, 40, 0.9);
-    color: #e7e9f5;
-    display: flex;
-    align-items: center;
-    gap: 6px;
-    font-size: 0.8rem;
-}
-
-.quick-btn-active {
-    background: linear-gradient(120deg, #2bcbff, #5e72eb);
-}
-
-.quick-icon {
-    font-size: 1rem;
-}
-
-.quick-label {
-    white-space: nowrap;
-}
-
 /* BOTTOM NAV – fixed overlay inside the car screen */
-
 .bottom-nav {
     position: sticky;
     bottom: 0;
@@ -460,3 +416,126 @@ html,
     width: 100%;
     height: 100%;
 }
+
+/* VW-style HOME MENU GRID – fills the screen under the header */
+
+.home-menu-content {
+    flex: 1;
+    min-height: 0;
+
+    display: flex;
+    align-items: stretch;
+    justify-content: stretch;
+
+    padding: 20px 0;
+}
+
+.home-menu-grid {
+    flex: 1;
+    width: 100%;
+    height: 100%;
+
+    display: grid;
+
+    grid-template-columns: repeat(5, minmax(0, 1fr));
+    grid-template-rows: repeat(2, minmax(0, 1fr));
+
+    gap: 20px;
+
+    margin: 0;
+    padding: 0;
+}
+
+.home-menu-tile {
+    border: none;
+    border-radius: 10px;
+    padding: 10px 12px;
+    background: radial-gradient(circle at top, #272b37, #141722 60%, #05060a);
+    box-shadow:
+        0 6px 10px rgba(0, 0, 0, 0.6),
+        0 0 0 1px rgba(255, 255, 255, 0.04);
+    color: #f5f5f5;
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+    gap: 8px;
+    text-align: center;
+    cursor: default;
+}
+
+.home-menu-icon {
+    font-size: 1.6rem;
+}
+
+.home-menu-label {
+    font-size: 0.85rem;
+    text-transform: uppercase;
+    letter-spacing: 0.08em;
+}
+
+/* Battery tile – interactive, glow on hover */
+.home-menu-tile-battery {
+    cursor: pointer;
+    transition:
+        transform 0.25s ease,
+        box-shadow 0.25s ease,
+        background 0.25s ease,
+        filter 0.25s ease;
+}
+
+.home-menu-tile-battery:hover {
+    transform: translateY(-3px) scale(1.04);
+    box-shadow:
+        0 0 25px rgba(80, 220, 255, 0.8),
+        0 8px 18px rgba(0, 0, 0, 0.8);
+    background: radial-gradient(circle at top, #2f3f6a, #111423 65%, #05060a);
+    filter: drop-shadow(0 0 12px rgba(80, 220, 255, 0.7));
+}
+
+.home-menu-tile-battery:active {
+    transform: translateY(-1px) scale(0.99);
+    box-shadow:
+        0 0 14px rgba(80, 220, 255, 0.7),
+        0 4px 10px rgba(0, 0, 0, 0.8);
+    filter: drop-shadow(0 0 8px rgba(80, 220, 255, 0.6));
+}
+
+/* Screen enter animation */
+.screen-battery-enter {
+    animation: battery-screen-in 300ms ease-out;
+    transform-origin: bottom center;
+}
+
+@keyframes battery-screen-in {
+    from {
+        opacity: 0;
+        transform: translateY(16px) scale(0.98);
+        filter: blur(2px);
+    }
+
+    to {
+        opacity: 1;
+        transform: translateY(0) scale(1);
+        filter: blur(0);
+    }
+}
+
+.screen-home-enter {
+    animation: home-screen-in 200ms ease-out;
+    transform-origin: bottom center;
+}
+
+@keyframes home-screen-in {
+    from {
+        opacity: 0;
+        transform: translateY(16px) scale(0.98);
+        filter: blur(2px);
+    }
+
+    to {
+        opacity: 1;
+        transform: translateY(0) scale(1);
+        filter: blur(0);
+    }
+}