body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #667eea, #764ba2);
    margin: 0;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.login-card, .register-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
    width: 350px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

h2 {
    margin-bottom: 1rem;
    font-weight: 600;
}

.input-group {
    margin-bottom: 1rem;
    text-align: left;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    align-self: flex-start;
}

.input-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1rem;
}

.btn {
    width: 100%;
    padding: 0.8rem;
    background: #667eea;
    border: none;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.3s;
}

.btn:hover {
    background: #5648b5;
}

.error {
    color: red;
    font-size: 0.9rem;
    margin-top: 1rem;
}

.hidden {
    display: none;
}