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HTML

<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <title>404 - Page introuvable</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        :root {
            --rouge: #ff5959;
            --dark-bg: #2b1212;
            --light-rouge: #ffa6a6;
            --white: #fff;
        }
        html, body {
            height: 100%;
            margin: 0;
            padding: 0;
            background: var(--dark-bg);
            color: var(--white);
            font-family: 'Segoe UI', 'Roboto', Arial, sans-serif;
            overflow: hidden;
        }
        body {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            z-index: 1;
        }
        .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 2rem 1.5rem;
            background: rgba(43, 18, 18, 0.85);
            border-radius: 1.5rem;
            box-shadow: 0 8px 32px 0 rgba(255, 89, 89, 0.25);
            backdrop-filter: blur(6px);
            max-width: 95vw;
        }
        h1 {
            font-size: 7rem;
            margin: 0;
            color: var(--rouge);
            letter-spacing: 0.1em;
            font-weight: 900;
        }
        h2 {
            font-size: 2rem;
            margin: 0.5rem 0 1.5rem 0;
            color: var(--white);
            font-weight: 700;
        }
        p {
            color: var(--light-rouge);
            font-size: 1.2rem;
            margin-bottom: 2rem;
        }
        a {
            display: inline-block;
            padding: 0.75rem 2rem;
            background: linear-gradient(90deg, var(--rouge), var(--light-rouge));
            color: var(--dark-bg);
            border-radius: 2rem;
            text-decoration: none;
            font-weight: bold;
            font-size: 1rem;
            transition: background 0.2s;
            box-shadow: 0 2px 16px 0 rgba(255, 89, 89, 0.15);
        }
        a:hover {
            background: linear-gradient(90deg, var(--light-rouge), var(--rouge));
            color: var(--white);
        }
        #bg {
            position: fixed;
            top: 0; left: 0; width: 100vw; height: 100vh;
            z-index: 0;
            pointer-events: none;
        }
        @media (max-width: 600px) {
            h1 { font-size: 4rem; }
            h2 { font-size: 1.2rem; }
            .container { padding: 1.2rem 0.5rem; }
            p { font-size: 1rem; }
        }
    </style>
</head>
<body>
    <canvas id="bg"></canvas>
    <div class="container">
        <h1>404</h1>
        <h2>Page introuvable !</h2>
        <p>Oups ! La page que vous recherchez n'existe pas ou a été déplacée..</p>
        <a href="/">Back to Home</a>
    </div>
    <script>
        // Dynamic animated background: moving rouge particles, mobile friendly
        const canvas = document.getElementById('bg');
        const ctx = canvas.getContext('2d');
        let dpr = window.devicePixelRatio || 1;
        let w = window.innerWidth, h = window.innerHeight;

function resize() {
            dpr = window.devicePixelRatio || 1;
            w = window.innerWidth;
            h = window.innerHeight;
            canvas.width = w * dpr;
            canvas.height = h * dpr;
            canvas.style.width = w + "px";
            canvas.style.height = h + "px";
            ctx.setTransform(1, 0, 0, 1, 0, 0);
            ctx.scale(dpr, dpr);
        }
        window.addEventListener('resize', resize);
        resize();

const particles = [];
        const colors = ['#ff5959', '#ffa6a6', '#F05A5A', '#EA2E2E'];
        const numParticles = 60;

for (let i = 0; i < numParticles; i++) {
            particles.push({
                x: Math.random() * w,
                y: Math.random() * h,
                r: 1.5 + Math.random() * 3.5,
                dx: -1 + Math.random() * 2,
                dy: -1 + Math.random() * 2,
                color: colors[Math.floor(Math.random() * colors.length)],
                alpha: 0.3 + Math.random() * 0.5
            });
        }

function draw() {
            ctx.clearRect(0, 0, w, h);
            for (let p of particles) {
                ctx.beginPath();
                ctx.arc(p.x, p.y, p.r, 0, 2 * Math.PI);
                ctx.fillStyle = p.color;
                ctx.globalAlpha = p.alpha;
                ctx.shadowColor = p.color;
                ctx.shadowBlur = 16;
                ctx.fill();
                ctx.globalAlpha = 1;
                ctx.shadowBlur = 0;
                // Move
                p.x += p.dx;
                p.y += p.dy;
                // Bounce off edges
                if (p.x < 0 || p.x > w) p.dx *= -1;
                if (p.y < 0 || p.y > h) p.dy *= -1;
            }
            requestAnimationFrame(draw);
        }
        draw();
    </script>
</body>
</html>

CSS