First

frontend/src/App.css

@@ -0,0 +1,47 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+
+#root {
+  max-width: 1280px;
+  margin: 0 auto;
+  padding: 2rem;
+  text-align: center;
+}
+
+.logo {
+  height: 6em;
+  padding: 1.5em;
+  will-change: filter;
+  transition: filter 300ms;
+}
+.logo:hover {
+  filter: drop-shadow(0 0 2em #646cffaa);
+}
+.logo.react:hover {
+  filter: drop-shadow(0 0 2em #61dafbaa);
+}
+
+@keyframes logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  a:nth-of-type(2) .logo {
+    animation: logo-spin infinite 20s linear;
+  }
+}
+
+.card {
+  padding: 2em;
+}
+
+.read-the-docs {
+  color: #888;
+}

frontend/src/App.tsx

@@ -0,0 +1,41 @@
+import './App.css';
+import MultiHintGame from './components/MultiHintGame';
+import { useEffect, useState } from 'react';
+
+function App() {
+  const [darkMode, setDarkMode] = useState(() => {
+    // Optional: prüfe bevorzugtes System-Theme
+    return window.matchMedia('(prefers-color-scheme: dark)').matches;
+  });
+
+  useEffect(() => {
+    if (darkMode) {
+      document.documentElement.classList.add('dark');
+    } else {
+      document.documentElement.classList.remove('dark');
+    }
+  }, [darkMode]);
+
+  const toggleDarkMode = () => {
+    setDarkMode(!darkMode);
+  };
+
+  return (
+    <div className="min-h-screen w-full bg-gray-50 dark:bg-gray-900 text-gray-900 dark:text-white">
+      <div className="absolute top-4 right-4">
+        <button
+          onClick={toggleDarkMode}
+          className="bg-gray-200 dark:bg-gray-700 text-sm px-3 py-1 rounded hover:scale-105 transition"
+        >
+          {darkMode ? '☀️ Light' : '🌙 Dark'}
+        </button>
+      </div>
+
+      <div className="flex flex-col items-center justify-start pt-10">
+        <MultiHintGame />
+      </div>
+    </div>
+  );
+}
+
+export default App;

frontend/src/assets/react.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>

frontend/src/components/MultiHintGame.tsx

@@ -0,0 +1,380 @@
+import { useEffect, useState, useCallback } from "react";
+import confetti from 'canvas-confetti';
+
+// Styles
+import '../styles/styles.css';
+
+// Types
+type GameSession = {
+  id: number;
+  hint: string;
+  totalHints: number;
+  digits: number;
+  answer: number;
+  link?: string;
+};
+
+type GuessResponse = {
+  correct: boolean;
+  feedback: string;
+  nextHint: string | null;
+  explanation: string | null;
+};
+
+type FeedbackType = "default" | "correct" | "misplaced" | "wrong";
+
+type PreviousGuess = {
+  digits: string[];
+  feedback: FeedbackType[];
+};
+
+export default function MultiHintGame() {
+  const [session, setSession] = useState<GameSession | null>(null);
+  const [currentRound, setCurrentRound] = useState(0);
+  const [digitCount, setDigitCount] = useState(4);
+  const [digits, setDigits] = useState<string[]>([]);
+  const [activeIndex, setActiveIndex] = useState(0);
+  const [digitFeedback, setDigitFeedback] = useState<FeedbackType[]>([]);
+  const [feedback, setFeedback] = useState<string | null>(null);
+  const [nextHint, setNextHint] = useState<string | null>(null);
+  const [explanation, setExplanation] = useState<string | null>(null);
+  const [gameOver, setGameOver] = useState(false);
+  const [previousGuesses, setPreviousGuesses] = useState<PreviousGuess[]>([]);
+  const [hasWon, setHasWon] = useState(false);
+  const [cooldownRemaining, setCooldownRemaining] = useState(0);
+
+  const [streak, setStreak] = useState(0);
+  const [maxStreak, setMaxStreak] = useState(0);
+
+  const COOLDOWN_MS = 6 * 60 * 60 * 1000; // 6 Stunden (für Demo: 6 * 1000 möglich)
+  const DEV_MODE = true;
+
+
+  const updateStreak = () => {
+    const today = new Date().toISOString().split("T")[0];
+    const lastPlayed = localStorage.getItem("lastPlayedDate");
+    let currentStreak = parseInt(localStorage.getItem("streakCount") || "0");
+    let max = parseInt(localStorage.getItem("maxStreak") || "0");
+
+    const yesterday = new Date();
+    yesterday.setDate(yesterday.getDate() - 1);
+    const yesterdayStr = yesterday.toISOString().split("T")[0];
+
+    if (lastPlayed === yesterdayStr) {
+      currentStreak += 1;
+    } else if (lastPlayed !== today) {
+      currentStreak = 1;
+    }
+
+    if (currentStreak > max) {
+      max = currentStreak;
+      localStorage.setItem("maxStreak", max.toString());
+    }
+
+    localStorage.setItem("lastPlayedDate", today);
+    localStorage.setItem("streakCount", currentStreak.toString());
+
+    setStreak(currentStreak);
+    setMaxStreak(max);
+  };
+
+
+
+
+
+const isStillCooldown = useCallback((): boolean => {
+  if (DEV_MODE) return false; // ← nie cooldown
+  const cooldownUntil = localStorage.getItem("cooldownUntil");
+  return cooldownUntil ? parseInt(cooldownUntil) > Date.now() : false;
+}, []);
+
+
+  const getCooldownRemaining = useCallback(() => {
+    const cooldownUntil = localStorage.getItem("cooldownUntil");
+    return cooldownUntil ? Math.max(0, parseInt(cooldownUntil) - Date.now()) : 0;
+  }, []);
+
+const canPlayDailyChallenge = useCallback((): boolean => {
+  if (DEV_MODE) return true; // ← erlaubt immer spielen
+  const lastPlayed = localStorage.getItem("lastDailyChallengeDate");
+  const today = new Date().toISOString().split("T")[0];
+  return !lastPlayed || lastPlayed !== today;
+}, []);
+
+
+  const formatCooldownTime = (ms: number): string => {
+    const totalSeconds = Math.floor(ms / 1000);
+    const hours = Math.floor(totalSeconds / 3600);
+    const minutes = Math.floor((totalSeconds % 3600) / 60);
+    const seconds = totalSeconds % 60;
+    return `${hours.toString().padStart(2, "0")}:${minutes
+      .toString()
+      .padStart(2, "0")}:${seconds.toString().padStart(2, "0")}`;
+  };
+
+  const handleShare = () => {
+    const attempts = currentRound + 1;
+    const shareText = `Für die tägliche Challenge der FaktenZahl habe ich ${attempts} Versuch${attempts > 1 ? 'e' : ''} gebraucht. Wie viele brauchst du? www.faktenzahl.de`;
+    if (navigator.share) {
+      navigator
+        .share({
+          title: 'FaktenZahl Ergebnis',
+          text: shareText,
+        })
+        .catch(console.error);
+    } else {
+      navigator.clipboard.writeText(shareText);
+      alert('Ergebnis in die Zwischenablage kopiert!');
+    }
+  };
+
+  const loadSession = () => {
+    if (!canPlayDailyChallenge()) {
+      setGameOver(true);
+      setSession(null);
+      setCooldownRemaining(getCooldownRemaining());
+      return;
+    }
+    fetch(`http://localhost:3000/api/new-session?daily=true`)
+      .then((res) => res.json())
+      .then((data) => {
+        setSession(data);
+        setCurrentRound(0);
+        setFeedback(null);
+        setNextHint(data.hint);
+        setExplanation(null);
+        setGameOver(false);
+        setDigitCount(data.digits);
+        setDigits(Array(data.digits).fill(""));
+        setDigitFeedback(Array(data.digits).fill("default"));
+        setActiveIndex(0);
+        setPreviousGuesses([]);
+        setHasWon(false);
+        localStorage.removeItem("hasWon");
+        localStorage.removeItem("explanation");
+        localStorage.removeItem("link");
+        localStorage.removeItem("currentRound");
+        localStorage.setItem("cooldownUntil", (Date.now() + COOLDOWN_MS).toString());
+        localStorage.setItem("lastDailyChallengeDate", new Date().toISOString().split("T")[0]);
+        setCooldownRemaining(COOLDOWN_MS);
+      });
+  };
+
+  useEffect(() => {
+    const stillCooldown = isStillCooldown();
+    setCooldownRemaining(getCooldownRemaining());
+
+    // Lese hasWon, explanation, link und currentRound aus localStorage
+    const storedHasWon = localStorage.getItem("hasWon");
+    const storedExplanation = localStorage.getItem("explanation");
+    const storedCurrentRound = localStorage.getItem("currentRound");
+    setHasWon(storedHasWon === "true");
+    setExplanation(storedExplanation || null);
+    if (storedCurrentRound) {
+      setCurrentRound(parseInt(storedCurrentRound));
+    }
+
+    if (stillCooldown || !canPlayDailyChallenge()) {
+      setGameOver(true);
+      setSession(null);
+    } else {
+      loadSession();
+    }
+  }, [isStillCooldown, canPlayDailyChallenge]);
+
+  useEffect(() => {
+    if (gameOver && cooldownRemaining > 0) {
+      const interval = setInterval(() => {
+        const remaining = getCooldownRemaining();
+        setCooldownRemaining(remaining);
+        if (remaining <= 0) {
+          setGameOver(false);
+          localStorage.removeItem("cooldownUntil");
+          localStorage.removeItem("hasWon");
+          localStorage.removeItem("explanation");
+          localStorage.removeItem("link");
+          localStorage.removeItem("currentRound");
+          loadSession();
+        }
+      }, 1000);
+      return () => clearInterval(interval);
+    }
+  }, [cooldownRemaining, getCooldownRemaining, gameOver]);
+
+  const handleDigitClick = (num: string) => {
+    if (activeIndex >= digitCount) return;
+    const newDigits = [...digits];
+    newDigits[activeIndex] = num;
+    setDigits(newDigits);
+    if (activeIndex < digitCount - 1) setActiveIndex(activeIndex + 1);
+  };
+
+  const handleBackspace = () => {
+    const newDigits = [...digits];
+    if (digits[activeIndex]) {
+      newDigits[activeIndex] = "";
+      setDigits(newDigits);
+    } else if (activeIndex > 0) {
+      newDigits[activeIndex - 1] = "";
+      setDigits(newDigits);
+      setActiveIndex(activeIndex - 1);
+    }
+  };
+
+  const submitGuess = async () => {
+    if (!session) return;
+    const fullGuess = digits.join("");
+
+    const res = await fetch("http://localhost:3000/api/guess", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        id: session.id,
+        guess: fullGuess,
+        round: currentRound,
+      }),
+    });
+
+    const data: GuessResponse = await res.json();
+    setFeedback(data.feedback);
+    setExplanation(data.explanation);
+    setNextHint(data.nextHint);
+
+    const correctAnswer = String(session.answer).split("");
+    const feedbackResult: FeedbackType[] = digits.map((digit, index) => {
+      if (digit === correctAnswer[index]) return "correct";
+      if (correctAnswer.includes(digit)) return "misplaced";
+      return "wrong";
+    });
+
+    setPreviousGuesses((prev) => [...prev, { digits: [...digits], feedback: feedbackResult }]);
+    setDigits(Array(digitCount).fill(""));
+    setDigitFeedback(Array(digitCount).fill("default"));
+    setActiveIndex(0);
+
+    if (data.correct || currentRound === 4) {
+      setGameOver(true);
+      setHasWon(data.correct);
+      localStorage.setItem("hasWon", String(data.correct));
+      localStorage.setItem("explanation", data.explanation || "");
+      localStorage.setItem("link", session.link || "");
+      localStorage.setItem("currentRound", String(currentRound));
+
+      if (data.correct) {
+        localStorage.setItem("cooldownUntil", (Date.now() + COOLDOWN_MS).toString());
+        localStorage.setItem("lastDailyChallengeDate", new Date().toISOString().split("T")[0]);
+        setCooldownRemaining(COOLDOWN_MS);
+        updateStreak();
+        confetti({
+          particleCount: 120,
+          spread: 80,
+          origin: { y: 0.6 },
+          colors: ['#00d9ff', '#00ff84', '#ffc107', '#ff4ecd'],
+        });
+      }
+    } else {
+      setCurrentRound((r) => r + 1);
+    }
+  };
+
+  const restart = () => {
+    if (isStillCooldown() || !canPlayDailyChallenge()) return;
+    loadSession();
+  };
+
+  const getBoxStyle = (status: FeedbackType) => {
+    switch (status) {
+      case "correct": return "bg-green-400";
+      case "misplaced": return "bg-yellow-300";
+      case "wrong": return "bg-red-400";
+      default: return "bg-blue-100";
+    }
+  };
+
+  return (
+
+    
+    <div className="w-[480px] mx-auto mt-10 p-6 bg-white dark:bg-gray-800 text-gray-900 dark:text-white rounded-xl shadow">
+      <h2 className="text-2xl font-bold mb-4 text-center">
+        🧠 Tägliche FaktenZahl ({new Date().toLocaleDateString('de-DE')})
+      </h2>
+
+      <div className="text-center mb-4 text-sm text-gray-700 dark:text-gray-300">
+      🔥 Aktuelle Streak: <strong>{streak}</strong> &nbsp; | &nbsp; 🏆 Beste Streak: <strong>{maxStreak}</strong>
+    </div>
+
+
+      {session && !gameOver && (
+        <>
+          <p className="mb-2">Hinweis {currentRound + 1} von {session.totalHints}:</p>
+          <div className="mb-4 bg-gray-100 dark:bg-gray-700 rounded p-4 text-center">
+            {nextHint}
+          </div>
+
+          <div className="flex flex-col gap-2 mb-6">
+            {previousGuesses.map((guess, i) => (
+              <div key={i} className="flex justify-center gap-2">
+                {guess.digits.map((digit, j) => (
+                  <div key={j} className={`w-20 h-24 text-4xl font-bold rounded-xl flex items-center justify-center text-white shadow ${getBoxStyle(guess.feedback[j])}`}>{digit}</div>
+                ))}
+              </div>
+            ))}
+
+            <div className="flex justify-center gap-4">
+              {digits.map((digit, i) => (
+                <div key={i} className={`w-24 h-28 text-6xl font-extrabold rounded-xl flex items-center justify-center shadow-xl text-white ${getBoxStyle(digitFeedback[i])}`} onClick={() => setActiveIndex(i)}>
+                  {digit || <span className="opacity-40">–</span>}
+                </div>
+              ))}
+            </div>
+          </div>
+
+          <div className="grid grid-cols-3 gap-2 max-w-xs mx-auto mb-4">
+            {[1, 2, 3, 4, 5, 6, 7, 8, 9].map(num => (
+              <button key={num} onClick={() => handleDigitClick(num.toString())} className="bg-gray-200 dark:bg-gray-600 hover:bg-gray-300 dark:hover:bg-gray-500 text-xl py-3 rounded">{num}</button>
+            ))}
+            <div></div>
+            <button onClick={() => handleDigitClick("0")} className="bg-gray-200 dark:bg-gray-600 hover:bg-gray-300 dark:hover:bg-gray-500 text-xl py-3 rounded">0</button>
+            <div></div>
+            <button onClick={handleBackspace} className="col-span-3 bg-red-200 dark:bg-red-400 hover:bg-red-300 dark:hover:bg-red-500 py-3 rounded font-bold">⬅️ Löschen</button>
+          </div>
+
+          <button onClick={submitGuess} disabled={digits.includes("")} className="bg-blue-600 dark:bg-blue-500 hover:bg-blue-700 dark:hover:bg-blue-600 text-white px-4 py-2 rounded w-full">Rate Zahl</button>
+        </>
+      )}
+
+      {gameOver && (
+        <div className={`mt-6 p-4 rounded text-center ${hasWon ? "bg-green-100 dark:bg-green-900" : "bg-red-100 dark:bg-red-900"}`}>
+          <p className={`text-xl font-bold mb-2 ${hasWon ? "text-green-700 dark:text-green-300" : "text-red-700 dark:text-red-300"}`}>
+            {hasWon ? "🎉 Richtig geraten!" : "😢 Leider daneben!"}
+          </p>
+          <p className="text-gray-800 dark:text-gray-200 mb-2">
+            Versuche: {currentRound + 1}
+          </p>
+          {explanation && <p className="text-gray-800 dark:text-gray-200 mb-2">{explanation}</p>}
+          {localStorage.getItem("link") && (
+            <a href={localStorage.getItem("link")!} target="_blank" rel="noopener noreferrer" className="text-blue-600 dark:text-blue-400 underline block mb-4">
+              Mehr erfahren ↗
+            </a>
+          )}
+          {cooldownRemaining > 0 && (
+            <>
+              <p className="mb-4 text-lg font-bold text-orange-600 dark:text-orange-400 border-2 border-orange-600 dark:border-orange-400 rounded-lg p-2 timer-pulse">
+                ⏳ Nächste Frage in: {formatCooldownTime(cooldownRemaining)}
+              </p>
+              <button
+                onClick={handleShare}
+                className="mt-2 bg-blue-500 hover:bg-blue-600 text-white px-3 py-2 rounded"
+              >
+                Teilen 📤
+              </button>
+            </>
+          )}
+          {cooldownRemaining <= 0 && (
+            <button onClick={restart} className="mt-4 bg-gray-600 hover:bg-gray-700 text-white px-3 py-2 rounded">Neue Runde starten</button>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/index.css

@@ -0,0 +1,69 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+
+:root {
+  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
+  line-height: 1.5;
+  font-weight: 400;
+
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+a {
+  font-weight: 500;
+  color: #646cff;
+  text-decoration: inherit;
+}
+a:hover {
+  color: #535bf2;
+}
+
+body {
+  margin: 0;
+  display: flex;
+  place-items: center;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+h1 {
+  font-size: 3.2em;
+  line-height: 1.1;
+}
+
+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;
+}
+button:hover {
+  border-color: #646cff;
+}
+button:focus,
+button:focus-visible {
+  outline: 4px auto -webkit-focus-ring-color;
+}
+
+@media (prefers-color-scheme: light) {
+  a:hover {
+    color: #747bff;
+  }
+  button {
+    background-color: #f9f9f9;
+  }
+}
+
+body {
+  @apply bg-gray-50 text-gray-900 dark:bg-gray-900 dark:text-white transition-colors duration-300;
+}

frontend/src/main.tsx

@@ -0,0 +1,10 @@
+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)

frontend/src/styles/styles.css

@@ -0,0 +1,8 @@
+@keyframes pulse {
+  0% { transform: scale(1); }
+  50% { transform: scale(1.05); }
+  100% { transform: scale(1); }
+}
+.timer-pulse {
+  animation: pulse 2s infinite;
+}

frontend/src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />