LearnSphere_2/404.html at main · omroy07/LearnSphere_2 · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Page not found – LearnSphere. The page you are looking for does not exist.">
    <meta name="robots" content="noindex, nofollow">
    <title>404 – Page Not Found | LearnSphere</title>
    <link rel="stylesheet" href="../variables.css">
    <script src="../theme.js"></script>
    <style>
        :root {
            --color-bg-start: #0d0d0d;
            --color-bg-end: #1a1a2e;
            --color-cyan: #00d9ff;
            --color-blue: #007bff;
            --color-blue-dark: #0056b3;
            --color-text: #ffffff;
            --color-text-muted: rgba(255, 255, 255, 0.65);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            background: linear-gradient(135deg, var(--color-bg-start), var(--color-bg-end));
            color: var(--color-text);
            font-family: 'Arial', sans-serif;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 20px;
            overflow: hidden;
        }

        /* ── Floating particles background ── */
        .particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
        }

        .particle {
            position: absolute;
            width: 4px;
            height: 4px;
            background: var(--color-cyan);
            border-radius: 50%;
            opacity: 0.4;
            animation: float linear infinite;
        }

        @keyframes float {
            0%   { transform: translateY(100vh) scale(0); opacity: 0; }
            10%  { opacity: 0.4; }
            90%  { opacity: 0.4; }
            100% { transform: translateY(-10vh) scale(1.5); opacity: 0; }
        }

        /* ── Main content ── */
        .container {
            position: relative;
            z-index: 1;
            max-width: 600px;
            animation: fadeSlideIn 0.8s ease-out both;
        }

        @keyframes fadeSlideIn {
            from { opacity: 0; transform: translateY(30px); }
            to   { opacity: 1; transform: translateY(0); }
        }

        /* ── 404 Number ── */
        .error-code {
            font-size: clamp(5rem, 20vw, 9rem);
            font-weight: 900;
            line-height: 1;
            background: linear-gradient(135deg, var(--color-cyan), var(--color-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: none;
            animation: glowPulse 3s ease-in-out infinite;
            letter-spacing: -2px;
        }

        @keyframes glowPulse {
            0%, 100% { filter: drop-shadow(0 0 12px rgba(0, 217, 255, 0.5)); }
            50%       { filter: drop-shadow(0 0 30px rgba(0, 217, 255, 0.9)); }
        }

        /* ── Emoji icon ── */
        .icon {
            font-size: 3.5rem;
            display: block;
            margin: 8px 0 16px;
            animation: bounce 2.5s ease-in-out infinite;
        }

        @keyframes bounce {
            0%, 100% { transform: translateY(0); }
            50%       { transform: translateY(-12px); }
        }

        h1 {
            font-size: clamp(1.4rem, 5vw, 2rem);
            margin-bottom: 12px;
            text-shadow: 0 0 10px var(--color-cyan);
        }

        p {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            margin-bottom: 32px;
            line-height: 1.6;
        }

        /* ── Buttons ── */
        .button-group {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            text-decoration: none;
            padding: 13px 24px;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            cursor: pointer;
            border: none;
        }

        .btn-primary {
            background: var(--color-blue);
            color: #fff;
            box-shadow: 0 4px 16px rgba(0, 123, 255, 0.35);
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--color-blue-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 123, 255, 0.5);
        }

        .btn-secondary {
            background: transparent;
            color: var(--color-cyan);
            border: 2px solid var(--color-cyan);
            box-shadow: 0 0 0 transparent;
        }

        .btn-secondary:hover,
        .btn-secondary:focus {
            background: rgba(0, 217, 255, 0.1);
            transform: translateY(-2px);
            box-shadow: 0 0 16px rgba(0, 217, 255, 0.3);
        }

        .btn:focus-visible {
            outline: 3px solid var(--color-cyan);
            outline-offset: 3px;
        }

        /* ── Countdown ── */
        .auto-redirect {
            margin-top: 28px;
            font-size: 0.88rem;
            color: var(--color-text-muted);
        }

        #countdown {
            color: var(--color-cyan);
            font-weight: bold;
        }
    </style>
</head>

<body>

    <!-- Animated background particles -->
    <div class="particles" aria-hidden="true" id="particles"></div>

    <main class="container" role="main">
        <span class="error-code" aria-label="Error 404">404</span>
        <span class="icon" role="img" aria-label="Lost in space">🚀</span>

        <h1>Oops! Page Not Found</h1>
        <p>
            The page you're looking for doesn't exist, has been moved,<br>
            or the link may be broken. Let's get you back on track!
        </p>

        <nav class="button-group" aria-label="Recovery options">
            <!-- TODO: Update the URL to the deployment URL -->
            <!-- Wrong URLs commented out
            <a href="index.html" class="btn btn-primary" class="btn btn-primary">🏠 Go Home</a>
            <a href="home.html" class="btn btn-secondary" class="btn btn-secondary">📚 Dashboard</a>
            -->
            <a href="https://learn-sphere-2-zjk8.vercel.app/index.html" class="btn btn-primary">🏠 Go Home</a>
            <a href="https://learn-sphere-2-zjk8.vercel.app/home.html" class="btn btn-secondary">📚 Dashboard</a>
        </nav>

        <p class="auto-redirect" aria-live="polite">
            Redirecting to the homepage in <span id="countdown">10</span> seconds…
        </p>
    </main>

    <script>
        // ── Particle generator ──────────────────────────────────────────────
        const container = document.getElementById("particles");
        const count = 30;

        for (let i = 0; i < count; i++) {
            const p = document.createElement("span");
            p.className = "particle";
            p.style.left = Math.random() * 100 + "%";
            p.style.animationDuration = (6 + Math.random() * 10) + "s";
            p.style.animationDelay = (Math.random() * 8) + "s";
            p.style.width = p.style.height = (2 + Math.random() * 4) + "px";
            container.appendChild(p);
        }

        // ── Auto-redirect countdown ─────────────────────────────────────────
        let seconds = 10;
        const countdownEl = document.getElementById("countdown");

        const timer = setInterval(() => {
            seconds -= 1;
            countdownEl.textContent = seconds;

            if (seconds <= 0) {
                clearInterval(timer);
                window.location.href = "index.html";
            }
        }, 1000);
    </script>
</body>

</html>