* {
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #4facfe, #00f2fe);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: #fff;
    padding: 30px;
    width: 320px;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    text-align: center;
}

.container h2 {
    margin-bottom: 20px;
}

input {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
}

button {
    width: 100%;
    padding: 10px;
    background: #4facfe;
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background: #00c6ff;
}

.error {
    background: #ffdddd;
    color: #a00;
    padding: 10px;
    margin-bottom: 10px;
}

.register-link {
    margin-top: 15px;
}