* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

body {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #4e73df, #1cc88a);
}

.container {
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

.card {
    background: #ffffff;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
    text-align: center;
    animation: fadeIn 0.8s ease-in-out;
}

.card h1 {
    margin-bottom: 10px;
    color: #333;
}

.card p {
    margin-bottom: 30px;
    color: #777;
}

.btn-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.btn {
    padding: 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #fff;
}

.admin {
    background: #e74a3b;
}

.teacher {
    background: #36b9cc;
}

.student {
    background: #f6c23e;
    color: #000;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
    opacity: 0.9;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}