<style>
.clock_wrapper {
	display: flex;
	justify-content: center;
	align-items: center;
	width: 100%;
	min-height: 640px;
	background: #f0f0f0;
	margin: 0 auto;
}
canvas {
	box-shadow: 0 0 20px rgba(0,0,0,0.1);
	border-radius: 50%;
	background: white;
	}
</style>

<div class="clock_wrapper">
    <canvas id="clock" width="400" height="400"></canvas>
</div>

<script>
const canvas = document.getElementById('clock');
const ctx = canvas.getContext('2d');

// 高清屏适配
const scale = window.devicePixelRatio || 1;
canvas.width = 400 * scale;
canvas.height = 400 * scale;
ctx.scale(scale, scale);

function drawClock() {
    // 清除画布
    ctx.clearRect(0, 0, canvas.width, canvas.height);

    // 获取当前时间
    const now = new Date();
    const hours = now.getHours() % 12;
    const minutes = now.getMinutes();
    const seconds = now.getSeconds();
    const milliseconds = now.getMilliseconds();

    // 表盘样式
    const centerX = canvas.width / 2 / scale;
    const centerY = canvas.height / 2 / scale;
    const radius = Math.min(centerX, centerY) - 10;

    // 绘制表盘背景
    const gradient = ctx.createRadialGradient(
        centerX, centerY, 0, centerX, centerY, radius
    );
    gradient.addColorStop(0, '#f8f8f8');
    gradient.addColorStop(1, '#e0e0e0');
    ctx.fillStyle = gradient;
    ctx.beginPath();
    ctx.arc(centerX, centerY, radius, 0, Math.PI * 2);
    ctx.fill();

    // 绘制边框
    ctx.strokeStyle = 'linear-gradient(45deg, #666, #999)';
    ctx.lineWidth = 8;
    ctx.beginPath();
    ctx.arc(centerX, centerY, radius - 4, 0, Math.PI * 2);
    ctx.stroke();

    // 绘制小时刻度
    ctx.lineWidth = 3;
    ctx.strokeStyle = '#333';
    for (let i = 0; i < 12; i++) {
        ctx.save();
        ctx.translate(centerX, centerY);
        ctx.rotate(i * 30 * Math.PI / 180);
        ctx.beginPath();
        ctx.moveTo(0, -radius + 20);
        ctx.lineTo(0, -radius + 40);
        ctx.stroke();
        ctx.restore();
    }

    // 绘制分钟刻度
    ctx.lineWidth = 1;
    ctx.strokeStyle = '#666';
    for (let i = 0; i < 60; i++) {
        if (i % 5 === 0) continue; // 跳过小时刻度
        ctx.save();
        ctx.translate(centerX, centerY);
        ctx.rotate(i * 6 * Math.PI / 180);
        ctx.beginPath();
        ctx.moveTo(0, -radius + 25);
        ctx.lineTo(0, -radius + 35);
        ctx.stroke();
        ctx.restore();
    }

    // 绘制数字
    ctx.font = '16px Arial';
    ctx.fillStyle = '#333';
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    for (let i = 1; i <= 12; i++) {
        const angle = i * 30 * Math.PI / 180;
        const x = centerX + Math.sin(angle) * (radius - 60);
        const y = centerY - Math.cos(angle) * (radius - 60);
        ctx.fillText(i.toString(), x, y);
    }

    // 计算指针角度
    const secondAngle = (seconds + milliseconds / 1000) * 6; // 每秒6度
    const minuteAngle = (minutes + seconds / 60) * 6;
    const hourAngle = (hours + minutes / 60) * 30;

    // 绘制时针
    ctx.save();
    ctx.translate(centerX, centerY);
    ctx.rotate(hourAngle * Math.PI / 180);
    ctx.fillStyle = '#333';
    ctx.shadowColor = 'rgba(0,0,0,0.2)';
    ctx.shadowBlur = 8;
    ctx.shadowOffsetY = 3;
    ctx.beginPath();
    ctx.moveTo(-4, 0);
    ctx.lineTo(0, -radius * 0.5);
    ctx.lineTo(4, 0);
    ctx.arc(0, 0, 4, 0, Math.PI * 2);
    ctx.fill();
    ctx.restore();

    // 绘制分针
    ctx.save();
    ctx.translate(centerX, centerY);
    ctx.rotate(minuteAngle * Math.PI / 180);
    ctx.fillStyle = '#666';
    ctx.beginPath();
    ctx.moveTo(-3, 0);
    ctx.lineTo(0, -radius * 0.7);
    ctx.lineTo(3, 0);
    ctx.arc(0, 0, 3, 0, Math.PI * 2);
    ctx.fill();
    ctx.restore();

    // 绘制秒针
    ctx.save();
    ctx.translate(centerX, centerY);
    ctx.rotate(secondAngle * Math.PI / 180);
    ctx.strokeStyle = '#e74c3c';
    ctx.lineWidth = 2;
    ctx.beginPath();
    ctx.moveTo(0, radius * 0.1);
    ctx.lineTo(0, -radius * 0.8);
    ctx.stroke();
    ctx.restore();

    // 绘制中心圆点
    ctx.beginPath();
    ctx.fillStyle = '#e74c3c';
    ctx.arc(centerX, centerY, 4, 0, Math.PI * 2);
    ctx.fill();

    requestAnimationFrame(drawClock);
}

drawClock();
</script>