* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: rgb(250, 250, 250);
    background-size: cover;
}

.container {
    width: 100%;
    max-width: 400px;
    background-color: #f1f1f1;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
}

.login-box {
    text-align: center;
}

.login-box h2 {
    color: #3f51b5;
    margin-bottom: 20px;
    font-size: 24px;
}

.input-box {
    position: relative;
    margin: 20px 0;
}

.input-box input {
    width: 100%;
    padding: 10px;
    background: none;
    border: 2px solid #D3D3D3;
    border-radius: 4px;
    outline: none;
    font-size: 16px;
    color: #3f51b5;
}

.input-box label {
    position: absolute;
    top: 50%;
    left: 10px;
    transform: translateY(-50%);
    color: #3f51b5;
    pointer-events: none;
    transition: all 0.3s ease;
}

.input-box input:focus + label,
.input-box input:valid + label {
    top: -10px;
    left: 10px;
    color: #000;
    font-size: 12px;
}

.submit-box input {
    width: 100%;
    padding: 10px;
    background-color: #4caf50;
    color: white;
    border: none;
    cursor: pointer;
    font-size: 16px;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.submit-box input:hover {
    background-color: #388e3c;
}

.captcha-box {
    margin: 20px 0;
}

#captcha {
    font-size: 20px;
    font-weight: bold;
    color: #ffeb3b;
    background-color: #3f51b5;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
}

#error-message {
    color: red;
    margin-top: 10px;
    font-size: 14px;
}