feat: add Berlin Clock layout and styling with Orbitron font

src/App.css

@@ -182,3 +182,24 @@
     border-right-color: var(--border);
   }
 }
+
+.berlin-clock {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 4px;
+}
+
+.seconds-lamp-container {
+  margin-bottom: 4px;
+  display: flex;
+  justify-content: center;
+}
+
+.lamp-row {
+  display: flex;
+  justify-content: center;
+  width: 100%;
+  max-width: 330px;
+  margin: 0 auto;
+}

src/App.tsx

@@ -3,7 +3,15 @@ import "./App.css";
 
 function App() {
   return (
-    <div>
+    <div className="clock-container">
+      <h1>Berlin Clock</h1>
+      <p>
+        The Berlin Clock (also known as the Mengenlehreuhr) uses lamps to represent the time.
+        The top lamp blinks every second. The next row of four red lamps each represents five hours.
+        The following row of four red lamps each represents one hour.
+        Then the next row of eleven lamps shows five‑minute blocks (every third lamp is red to
+        mark quarter hours). The last row shows the remaining minutes one by one.
+      </p>
       <TimeConverter />
     </div>
   );

src/components/Lamp.tsx

@@ -14,23 +14,17 @@ function getBackgroundColor(state: LampState): string {
 }
 
 function getBorderRadius(variant?: LampProps["variant"]): string {
-  switch (variant) {
+  if (variant === "alone") return "50%";
-    case "alone":
+  if (variant === "first") return "16px 0 0 16px";
-      return "50%";
+  if (variant === "last") return "0 16px 16px 0";
-    case "first":
-      return "50% 0 0 50%";
-    case "last":
-      return "0 50% 50% 0";
-    default:
   return "0";
-  }
 }
 
 export function Lamp({ state, id, variant }: LampProps) {
   const style: React.CSSProperties = {
-    display: "inline-block",
+    display: "block",
-    width: 20,
+    width: variant === "alone" ? 50 : "100%",
-    height: 20,
+    height: 50,
     backgroundColor: getBackgroundColor(state),
     borderRadius: getBorderRadius(variant),
     margin: 1,

src/components/LampLine.tsx

@@ -11,7 +11,7 @@ export function LampLine({ states, rowTestId }: LampLineProps) {
   return (
     <div
       data-testid={rowTestId ?? "lamp-line"}
-      style={{ display: "flex", gap: 2, marginBottom: 5 }}
+      style={{ display: "flex", marginBottom: 10, width: "100%", justifyContent: "space-evenly" }}
     >
       {states.map((state, index) => {
         let variant: "alone" | "first" | "last" | "middle" | undefined;
@@ -25,12 +25,16 @@ export function LampLine({ states, rowTestId }: LampLineProps) {
           variant = "middle";
         }
         return (
-          <Lamp
+          <div
             key={index}
+            style={{ flex: 1, display: "flex" }}
+          >
+            <Lamp
               state={state}
               id={`lamp-${index}`}
               variant={variant}
             />
+          </div>
         );
       })}
     </div>

src/containers/BerlinClock.tsx

@@ -11,17 +11,22 @@ export function BerlinClock({ enabled, clock }: BerlinClockProps) {
   if (!enabled) return null;
 
   return (
-    <div>
+    <div className="berlin-clock" style={{ display: "flex", flexDirection: "column", alignItems: "center", width: "100%" }}>
-      <div
+      <div className="seconds-lamp-container" data-testid="seconds-row" style={{ width: "100%", display: "flex", justifyContent: "center" }}>
-        data-testid="seconds-row"
+        <Lamp state={clock.secondsRow[0]} variant="alone" id="seconds-lamp" />
-        style={{ display: "flex", gap: 2, marginBottom: 5 }}
-      >
-        <Lamp state={clock.secondsRow[0]} id="seconds-lamp" variant="alone" />
       </div>
+      <div className="lamp-row" style={{ width: "100%" }}>
         <LampLine states={clock.fiveHours} rowTestId="five-hours-row" />
+      </div>
+      <div className="lamp-row" style={{ width: "100%" }}>
         <LampLine states={clock.oneHour} rowTestId="single-hours-row" />
+      </div>
+      <div className="lamp-row" style={{ width: "100%" }}>
         <LampLine states={clock.fiveMinutes} rowTestId="five-minutes-row" />
+      </div>
+      <div className="lamp-row" style={{ width: "100%" }}>
         <LampLine states={clock.oneMinute} rowTestId="single-minutes-row" />
       </div>
+    </div>
   );
 }

src/containers/TimeConverter.tsx

@@ -19,6 +19,12 @@ export function TimeConverter() {
 
   return (
     <div>
+      <BerlinClock enabled={true} clock={berlinClock} />
+      <DigitalClock
+        currentTime={currentTime}
+        onTimeChange={setCurrentTime}
+        disabled={useSystemTime}
+      />
       <label>
         <input
           type="checkbox"
@@ -33,12 +39,6 @@ export function TimeConverter() {
         />
         Use system time
       </label>
-      <BerlinClock enabled={true} clock={berlinClock} />
-      <DigitalClock
-        currentTime={currentTime}
-        onTimeChange={setCurrentTime}
-        disabled={useSystemTime}
-      />
     </div>
   );
 }

src/index.css

@@ -1,3 +1,5 @@
+@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;700&display=swap');
+
 :root {
   --text: #6b6375;
   --text-h: #08060d;
@@ -59,6 +61,8 @@
   min-height: 100svh;
   display: flex;
   flex-direction: column;
+  justify-content: center;
+  align-items: center;
   box-sizing: border-box;
 }
 
@@ -109,3 +113,11 @@ code {
   padding: 4px 8px;
   background: var(--code-bg);
 }
+
+.clock-container {
+  font-family: 'Orbitron', monospace;
+}
+
+.clock-container input {
+  font-family: inherit;
+}