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	<!DOCTYPE html>
	<html lang="zh-Hant">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>幸運抽獎機</title>
	<!-- Load Tailwind CSS -->
	<script src="https://cdn.tailwindcss.com"></script>
	<style>
	/* Confetti Keyframes: Start at bottom, burst up, then fall (simulating gravity) */
	@keyframes confetti-burst-fall {
	/* FIX 1: 確保起始可見 (opacity 1) 且從底部開始相對位移 */
	0% { transform: translateY(0) translateX(0) rotate(0deg); opacity: 1; }
	10% { transform: translateY(-40vh) translateX(var(--confetti-initial-x)) rotate(180deg); opacity: 1; } /* Initial upward burst */
	100% { transform: translateY(100vh) translateX(var(--confetti-end-x-offset)) rotate(1080deg); opacity: 0.5; }
	}

	@keyframes confetti-shake {
	0% { transform: translateX(0); }
	100% { transform: translateX(15px); }
	}

	/* NEW: Winner flash animation */
	@keyframes winner-flash {
	0%, 100% { box-shadow: 0 0 15px rgba(252, 211, 77, 0.8); background-color: rgba(31, 41, 55, 0.8); }
	50% { box-shadow: 0 0 40px rgba(252, 211, 77, 1); background-color: rgba(252, 211, 77, 0.9); }
	}

	/* Custom styles for the spinning wheel */
	.wheel-container {
	position: relative;
	width: 500px; /* 轉盤加大 */
	height: 500px; /* 轉盤加大 */
	margin: 0 auto;
	border-radius: 50%;
	overflow: hidden;
	background: #1f2937;
	box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
	transition: transform 0s; /* Default: no transition */
	}

	.wheel {
	width: 100%;
	height: 100%;
	border-radius: 50%;
	position: relative;
	transition: transform 6s cubic-bezier(0.2, 1, 0.3, 1); /* Slower, smoother deceleration */
	transform-origin: 50% 50%; /* 明確指定旋轉中心 */
	}

	.wheel-pointer {
	position: absolute;
	top: 0;
	left: 50%;
	transform: translateX(-50%);
	width: 0;
	height: 0;
	border-left: 15px solid transparent;
	border-right: 15px solid transparent;
	border-top: 30px solid #fcd34d; /* Yellow arrow */
	z-index: 20;
	/* FIX 2: 移除 box-shadow，只保留 drop-shadow 修正方形陰影問題 */
	filter: drop-shadow(0 0 5px rgba(0, 0, 0, 0.5)) drop-shadow(0 4px 6px rgba(0, 0, 0, 0.3));
	transition: transform 0.1s;
	}

	.wheel-center-dot { /* FIX 3: 縮小尺寸 */
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	width: 20px; /* 縮小 */
	height: 20px; /* 縮小 */
	border-radius: 50%;
	background: #fcd34d; /* Yellow */
	border: 4px solid #1f2937; /* Dark border to contrast */
	box-shadow: 0 0 10px rgba(255, 255, 255, 0.4);
	z-index: 19; /* 降低 Z-index，讓 Overlay 蓋在上面 */
	pointer-events: none;
	}

	/* Overlay to display the winner text clearly in the center */
	.winner-display-overlay {
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	width: 80%;
	height: 80%;
	display: flex;
	align-items: center;
	justify-content: center;
	text-align: center;
	pointer-events: none;
	z-index: 25; /* FIX 3: 提高 Z-index，確保結果可見 */
	}

	.segment-text {
	/* 讓文字可以跟著轉盤移動 */
	transition: none !important;
	}

	/* Override Tailwind for custom scrollbar aesthetics */
	textarea::-webkit-scrollbar {
	width: 8px;
	}
	textarea::-webkit-scrollbar-thumb {
	background-color: #fcd34d;
	border-radius: 4px;
	}
	</style>
	</head>
	<body class="bg-gray-100 min-h-screen p-4 sm:p-8 font-sans">

	<div id="app" class="max-w-6xl mx-auto">
	<h1 class="text-4xl font-extrabold text-gray-800 mb-6 text-center">🎁 幸運抽獎機 🎁</h1>

	<div class="flex flex-col lg:flex-row gap-8">
	<!-- Left Side: Controls and Participants Input -->
	<div class="lg:w-1/3 p-6 bg-white shadow-xl rounded-xl border border-gray-200">
	<h2 class="2xl font-semibold mb-4 text-gray-700">1. 參加者名單輸入</h2>
	<p class="text-sm text-gray-500 mb-3">格式：座號姓名 (每行一組)</p>
	<textarea id="participantsInput" rows="10" class="w-full p-3 border border-gray-300 rounded-lg focus:ring-amber-500 focus:border-amber-500 text-sm font-mono" placeholder="範例：
	1 王小明
	2 李大華
	3 陳美玲
	..."></textarea>

	<button onclick="loadParticipants()" class="mt-4 w-full bg-blue-600 hover:bg-blue-700 text-white font-bold py-3 px-4 rounded-lg shadow-md transition duration-200">
	載入名單 (共 <span id="participantCount">0</span> 人)
	</button>

	<h2 class="text-2xl font-semibold mt-8 mb-4 text-gray-700">2. 抽獎控制</h2>
	<div id="statusMessage" class="p-3 bg-red-100 text-red-700 rounded-lg text-sm mb-4 hidden"></div>

	<button id="startButton" onclick="startDraw()" class="w-full bg-amber-500 hover:bg-amber-600 text-gray-900 font-bold py-3 px-4 rounded-lg shadow-lg transition duration-200 disabled:opacity-50" disabled>
	開始抽獎！
	</button>
	</div>

	<!-- Right Side: Slot Machine Display -->
	<div class="lg:w-2/3 p-6 bg-white shadow-xl rounded-xl flex flex-col items-center">
	<h2 class="text-2xl font-semibold mb-8 text-gray-700 text-center">幸運轉盤模擬</h2>

	<div id="wheelContainer" class="wheel-container">
	<!-- 指針 -->
	<div class="wheel-pointer"></div>
	<!-- NEW: 轉盤中央固定裝飾點 -->
	<div class="wheel-center-dot"></div>

	<!-- 轉盤本體 (Conic Gradient) -->
	<div id="spinningWheel" class="wheel"></div>

	<!-- 中央顯示區 (用於中獎時鎖定顯示名字) -->
	<div id="winnerOverlay" class="winner-display-overlay opacity-0 transition-opacity duration-1000">
	<span id="overlayText" class="text-5xl font-extrabold text-amber-400 bg-gray-800/80 backdrop-blur-sm p-4 rounded-xl shadow-2xl"></span>
	</div>
	</div>

	<!-- 底部顯示區已移除 -->
	</div>
	</div>
	</div>

	<script>
	const participantsInput = document.getElementById('participantsInput');
	const participantCountSpan = document.getElementById('participantCount');
	const startButton = document.getElementById('startButton');
	const statusMessage = document.getElementById('statusMessage');
	const spinningWheel = document.getElementById('spinningWheel');
	const winnerOverlay = document.getElementById('winnerOverlay');
	const overlayText = document.getElementById('overlayText');

	let participants = [];
	let cheatingNumber = null;
	let isDrawing = false;
	let currentRotation = 0; // The current degrees the wheel has rotated

	// Macaron/Pastel Color Palette
	const segmentColors = [
	'#ffc8dd', // Pastel Pink
	'#a2e2ff', // Sky Blue
	'#baffc9', // Mint Green
	'#ffffba', // Pale Yellow
	'#ffb3a7', // Coral
	'#cbaacb', // Lavender
	'#f9bb82', // Peach
	'#9ed2be', // Light Teal
	'#e0aaff', // Violet
	'#a7c7e7' // Light Blue
	];

	const totalRotations = 5; // The number of full spins the wheel must complete
	const spinDuration = 6000; // 6 seconds total spin time
	const wheelRadius = 250; // Half of the 500px container width

	// --- Sound Effect (Web Audio API) ---
	function playWinnerSound() {
	try {
	const audioContext = new (window.AudioContext \|\| window.webkitAudioContext)();

	const oscillator = audioContext.createOscillator();
	oscillator.type = 'triangle';
	oscillator.frequency.setValueAtTime(440, audioContext.currentTime);

	const gainNode = audioContext.createGain();
	gainNode.gain.setValueAtTime(0, audioContext.currentTime);

	// Envelope (Attack, Decay, Release)
	gainNode.gain.linearRampToValueAtTime(0.5, audioContext.currentTime + 0.05);
	gainNode.gain.linearRampToValueAtTime(0.3, audioContext.currentTime + 0.2);
	gainNode.gain.exponentialRampToValueAtTime(0.0001, audioContext.currentTime + 0.5);

	// Pitch shift up for cheer
	oscillator.frequency.exponentialRampToValueAtTime(880, audioContext.currentTime + 0.5);

	oscillator.connect(gainNode);
	gainNode.connect(audioContext.destination);

	oscillator.start();
	oscillator.stop(audioContext.currentTime + 0.5);
	} catch (e) {
	console.warn("Web Audio API not supported or failed to start:", e);
	}
	}


	// --- Confetti Effect ---

	/**
	* Creates and launches the confetti particles with burst effect.
	*/
	function createConfetti() {
	const confettiContainer = document.body; // Use body for fixed positioning
	const colors = ['#ffc8dd', '#a2e2ff', '#baffc9', '#ffffba', '#e0aaff', '#fcd34d'];
	const numConfetti = 100;

	for (let i = 0; i < numConfetti; i++) {
	const c = document.createElement('div');
	c.style.position = 'fixed';
	c.style.borderRadius = '2px';
	c.style.zIndex = '1000';
	c.style.pointerEvents = 'none';

	// Randomize size and shape (30% chance of being a long rectangle/line)
	const width = Math.random() * 3 + 3; // 3 to 6 px
	const height = Math.random() < 0.3 ? Math.random() * 12 + 6 : width;

	c.style.width = `${width}px`;
	c.style.height = `${height}px`;
	c.style.backgroundColor = colors[Math.floor(Math.random() * colors.length)];

	// Initial horizontal position (centered burst)
	const startX = window.innerWidth / 2 + (Math.random() - 0.5) * 400;
	c.style.left = `${startX}px`;
	// FIX 1: 使用 100vh 確保起始點在視窗底部邊緣 (為了解決 confetti 不見的問題)
	c.style.top = `100vh`;

	const duration = Math.random() * 2 + 3; // 3 to 5 seconds
	const delay = Math.random() * 0.5;
	const endXOffset = (Math.random() - 0.5) * 500; // Scatter horizontally
	const initialX = (Math.random() - 0.5) * 150; // Initial burst horizontal move

	// Apply animation
	c.style.animation = `
	confetti-burst-fall ${duration}s ease-in ${delay}s forwards,
	confetti-shake ${Math.random() * 1 + 1}s infinite alternate
	`;
	c.style.setProperty('--confetti-end-x-offset', `${endXOffset}px`);
	c.style.setProperty('--confetti-initial-x', `${initialX}px`);

	confettiContainer.appendChild(c);

	// Remove the element after animation ends
	setTimeout(() => c.remove(), (duration + delay) * 1000);
	}
	}


	// --- Core Setup & State Management ---

	/**
	* Parses the participants and generates the conic gradient for the wheel.
	*/
	function loadParticipants() {
	participants = [];

	winnerOverlay.classList.remove('opacity-100', 'animate-flash');
	winnerOverlay.classList.add('opacity-0');
	cheatingNumber = null;
	spinningWheel.style.transform = 'rotate(0deg)';
	currentRotation = 0;

	const lines = participantsInput.value.trim().split('\n').filter(line => line.trim() !== '');

	lines.forEach(line => {
	const parts = line.trim().split(/\s+/);
	if (parts.length >= 2) {
	const id = parseInt(parts[0], 10);
	const name = parts.slice(1).join(' ');

	if (!isNaN(id)) {
	participants.push({ id, name, display: `${id} - ${name}` });
	}
	}
	});

	if (participants.length > 0) {
	generateWheelSegments();
	startButton.disabled = false;
	statusMessage.classList.add('hidden');
	} else {
	startButton.disabled = true;
	showStatus('請輸入有效的參加者名單。', 'bg-red-100 text-red-700');
	}

	participantCountSpan.textContent = participants.length;
	}

	/**
	* Generates the CSS conic gradient for the wheel based on participants.
	*/
	function generateWheelSegments() {
	const N = participants.length;
	if (N === 0) {
	spinningWheel.style.background = '#374151';
	return;
	}

	const anglePerSegment = 360 / N;
	let gradientString = 'conic-gradient(';
	let currentAngle = 0;

	participants.forEach((p, index) => {
	const color = segmentColors[index % segmentColors.length];

	// Add segment color start
	if (index > 0) {
	gradientString += `, ${color} ${currentAngle}deg`;
	} else {
	gradientString += `${color} ${currentAngle}deg`;
	}

	// Add segment color stop
	currentAngle += anglePerSegment;
	gradientString += `, ${color} ${currentAngle}deg`;
	});

	gradientString += ')';
	spinningWheel.style.background = gradientString;

	// Re-add text overlays
	addSegmentTextOverlays(N, anglePerSegment);
	}

	/**
	* Adds transparent overlays for text display on the segments.
	*/
	function addSegmentTextOverlays(N, anglePerSegment) {
	// Remove old texts first
	spinningWheel.querySelectorAll('.segment-text').forEach(el => el.remove());

	// 調整字體大小，使其更容易閱讀 (字體加大)
	const baseFontSize = (N <= 10) ? '18px' : (N <= 20) ? '14px' : '12px';
	const textRadius = 0.85 * wheelRadius; // 移動到更外圈

	participants.forEach((p, index) => {
	const centerAngle = (index * anglePerSegment) + (anglePerSegment / 2); // Center of the segment

	// Standard Cartesian angle adjustment (0 deg top clockwise -> 0 deg right counter-clockwise)
	const angleInRadians = (centerAngle - 90) * (Math.PI / 180);

	// Calculate horizontal (x) and vertical (y) translation distances
	const x = textRadius * Math.cos(angleInRadians);
	const y = textRadius * Math.sin(angleInRadians);

	const textDiv = document.createElement('div');
	// 使用深色文字搭配淺色馬卡龍背景
	textDiv.className = 'segment-text absolute text-gray-900 font-bold text-center';
	textDiv.textContent = p.display;
	textDiv.style.fontSize = baseFontSize;
	textDiv.style.width = '50%'; // Wide enough for text
	textDiv.style.top = '50%';
	textDiv.style.left = '50%';

	// 1. translate(-50%, -50%): Centers the text div itself
	// 2. translate(${x}px, ${y}px): Moves the centered text outwards from the center (0,0)
	// 3. rotate(${centerAngle}deg): Rotates the text to be aligned radially
	textDiv.style.transform = `
	translate(-50%, -50%)
	translate(${x}px, ${y}px)
	rotate(${centerAngle}deg)
	`;
	textDiv.style.whiteSpace = 'nowrap';
	textDiv.style.userSelect = 'none';

	spinningWheel.appendChild(textDiv);
	});
	}

	/**
	* Handles the secret keyboard input for cheating (invisible to users).
	*/
	function handleKeydown(event) {
	if (isDrawing) return;

	// Check if the key is a digit (0-9)
	if (event.key >= '0' && event.key <= '9') {
	if (!cheatingNumber) cheatingNumber = '';

	// Max length for input buffer
	if (cheatingNumber.length < 5) {
	cheatingNumber += event.key;
	console.log('Secret input buffer:', cheatingNumber);
	}
	} else if (event.key === 'Backspace' \|\| event.key === 'Delete') {
	if (cheatingNumber && cheatingNumber.length > 0) {
	cheatingNumber = cheatingNumber.slice(0, -1);
	console.log('Secret input buffer cleared one digit.');
	}
	} else if (event.key === 'Escape') {
	cheatingNumber = null;
	console.log('Secret input cleared.');
	}
	}

	// --- Wheel Control Functions ---

	/**
	* Starts the drawing process (spinning the wheel).
	*/
	function startDraw() {
	if (isDrawing \|\| participants.length === 0) return;

	isDrawing = true;
	startButton.disabled = true;
	startButton.textContent = '抽獎進行中...';
	winnerOverlay.classList.remove('opacity-100', 'animate-flash');
	winnerOverlay.classList.add('opacity-0');

	// 1. Determine the winner
	let finalWinnerId = cheatingNumber ? parseInt(cheatingNumber, 10) : null;
	let winnerIndex = -1;

	if (finalWinnerId) {
	winnerIndex = participants.findIndex(p => p.id === finalWinnerId);
	if (winnerIndex === -1) {
	finalWinnerId = null;
	showStatus(`⚠️ 錯誤: 指定號碼 ${cheatingNumber} 不存在。執行隨機抽獎。`, 'bg-red-100 text-red-700', spinDuration);
	} else {
	showStatus(`抽獎進行中...`, 'bg-green-100 text-green-700', spinDuration);
	}
	}

	if (!finalWinnerId) {
	const randomIndex = Math.floor(Math.random() * participants.length);
	finalWinnerId = participants[randomIndex].id;
	winnerIndex = randomIndex;
	showStatus(`隨機抽獎進行中...`, 'bg-blue-100 text-blue-700', spinDuration);
	}

	// 2. Calculate the final rotation angle
	const N = participants.length;
	const anglePerSegment = 360 / N;

	const winnerStartAngle = winnerIndex * anglePerSegment;
	const targetCenterAngle = winnerStartAngle + (anglePerSegment / 2);
	const finalStopAngle = 360 - targetCenterAngle;

	// Total rotation: Multiple full rotations + the precise stopping angle
	const totalRotationDegrees = totalRotations * 360 + finalStopAngle;

	// 3. Apply the rotation transition

	// Temporarily disable transition for reset
	spinningWheel.style.transition = 'none';
	spinningWheel.style.transform = `rotate(0deg)`;

	// Force redraw before applying the transition
	spinningWheel.offsetHeight;

	// Apply the transition and the final rotation
	spinningWheel.style.transition = `transform ${spinDuration / 1000}s cubic-bezier(0.2, 1, 0.3, 1)`;
	spinningWheel.style.transform = `rotate(${totalRotationDegrees}deg)`;

	currentRotation = totalRotationDegrees;

	// 4. End the draw after the transition finishes
	setTimeout(() => {
	finishLottery(finalWinnerId, winnerIndex);
	}, spinDuration);
	}

	/**
	* Finalizes the draw, snaps the result, and declares the winner.
	*/
	function finishLottery(finalWinnerId, winnerIndex) {
	isDrawing = false;
	startButton.disabled = false;
	startButton.textContent = '重新抽獎';

	const winner = participants.find(p => p.id === finalWinnerId);

	if (!winner) {
	showStatus('抽獎結果無效，請檢查名單。', 'bg-red-100 text-red-700', 5000);
	return;
	}

	// 1. 禁用 CSS transition
	spinningWheel.style.transition = 'none';

	// 2. 應用最終旋轉角度 (确保最终靜止位置正確)
	spinningWheel.style.transform = `rotate(${currentRotation % 360}deg)`;

	// 3. 顯示中獎者疊層
	overlayText.textContent = `${winner.id} - ${winner.name}`;
	winnerOverlay.classList.remove('opacity-0');
	winnerOverlay.classList.add('opacity-100', 'animate-flash');

	// NEW: Play sound effect and trigger confetti
	playWinnerSound();
	createConfetti();

	// Remove flash class after animation finishes (0.5s * 3 = 1.5s)
	setTimeout(() => {
	winnerOverlay.classList.remove('animate-flash');
	}, 1500);

	cheatingNumber = null;
	showStatus(`恭喜 ${winner.name} 中獎!`, 'bg-purple-100 text-purple-700', 5000);
	}

	/**
	* Shows a temporary status message.
	*/
	function showStatus(msg, className, duration = 3000) {
	statusMessage.textContent = msg;
	statusMessage.className = `p-3 rounded-lg text-sm mb-4 ${className}`;
	statusMessage.classList.remove('hidden');
	setTimeout(() => {
	statusMessage.classList.add('hidden');
	}, duration);
	}

	// --- Initialization ---

	window.onload = () => {
	// Add initial mock data
	participantsInput.value = `1 艾倫
	2 貝拉
	3 查理
	4 戴安
	5 艾迪
	6 芬妮
	7 蓋瑞
	8 海倫
	9 伊恩
	10 珍妮
	11 凱文
	12 莉莉`;

	loadParticipants();
	document.addEventListener('keydown', handleKeydown);
	};
	</script>

	</body>
	</html>