body {
            font-family: 'Poppins', sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background: url('background1.jpg') no-repeat center center/cover;
            color: #333;
            text-align: center;
            overflow: hidden;
            position: relative;
            transition: background 1s ease-in-out;
        }
        .container {
            background: rgba(255, 255, 255, 0.9);
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            position: relative;
            z-index: 2;
        }
        h1 {
            font-size: 2.5em;
            color: #ff5733;
            margin-bottom: 20px;
        }
        .student {
            font-size: 1.8em;
            font-weight: bold;
            margin: 20px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .student img {
            width: 220px;
            height: 220px;
            border-radius: 50%;
            border: 5px solid #ff5733;
            margin-top: 10px;
            transition: transform 0.3s ease-in-out;
        }
        .student img:hover {
            transform: scale(1.1);
        }
        .button {
            padding: 12px 25px;
            font-size: 1.4em;
            font-weight: bold;
            border: none;
            border-radius: 10px;
            background: #ff5733;
            color: white;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
        }
        .button:hover {
            background: #e74c3c;
            transform: scale(1.05);
        }
        .announcement {
            font-size: 1.6em;
            font-weight: bold;
            color: #2ecc71;
            margin-top: 15px;
            display: none;
        }
        .firework {
            position: absolute;
            width: 6px;
            height: 6px;
            background: radial-gradient(circle, yellow, red, transparent);
            border-radius: 50%;
            animation: explode 1s ease-out forwards;
            opacity: 0.8;
        }
        @keyframes explode {
            0% { transform: scale(1); opacity: 1; }
            100% { transform: scale(8); opacity: 0; }
        }