:root {
            --gold: #ffd700;
            --white: #ffffff;
        }
        body, html {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            background: radial-gradient(circle, #1a0a0a, #000);
            font-family: 'Poppins', sans-serif;
            transition: background 3s ease;
        }
        .bg-red { background: radial-gradient(circle, #400, #000); }
        .bg-blue { background: radial-gradient(circle, #001a33, #000); }
        .bg-purple { background: radial-gradient(circle, #2d004d, #000); }
        canvas {
            position: absolute;
            top: 0;
            left: 0;
            z-index: 1;
        }
        .header-text {
            position: absolute;
            top: 20px;
            width: 100%;
            text-align: center;
            color: var(--gold);
            font-size: 2.5rem;
            font-weight: bold;
            letter-spacing: 5px;
            text-shadow: 0 0 15px rgba(255, 215, 0, 0.7);
            z-index: 10;
            text-transform: uppercase;
        }
        .slider-container {
            position: relative;
            z-index: 10;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            perspective: 1000px;
        }
        .card {
            position: absolute;
            width: 85%;
            max-width: 450px;
            padding: 40px;
            border-radius: 30px;
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(20px);
            border: 2px solid rgba(255, 215, 0, 0.3);
            text-align: center;
            color: white;
            box-shadow: 0 20px 50px rgba(0,0,0,0.8);
            opacity: 0;
            transform: scale(0.8) rotateY(-10deg);
            transition: all 1s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card.active {
            opacity: 1;
            transform: scale(1) rotateY(0deg);
            border-color: var(--card-color);
            box-shadow: 0 0 30px var(--card-color);
        }
        .card h2 {
            font-size: 2rem;
            margin-bottom: 20px;
            color: var(--card-color);
            text-transform: capitalize;
        }
        .card p {
            font-size: 1.2rem;
            line-height: 1.8;
            font-style: italic;
        }
        .footer-info {
            position: absolute;
            bottom: 20px;
            width: 100%;
            text-align: center;
            z-index: 10;
            color: white;
        }
        .footer-info .name {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--gold);
            display: block;
            margin-bottom: 5px;
        }
        .footer-info .made-with {
            font-size: 0.9rem;
            opacity: 0.8;
        }
        @media (max-width: 600px) {
            .header-text { font-size: 1.5rem; }
            .card h2 { font-size: 1.5rem; }
            .card p { font-size: 1rem; }
        }