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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    min-height: 100vh;
    background-color: white;
}

.header {
    background-color: black;
    padding: 20px;
    margin-bottom: 40px;
}

.logo img {
    height: 24px;
    display: block;
}

.form-container {
    max-width: 40%;
    margin: 0 auto;
    padding: 20px;
}

.login-form {
    margin-top: 60px;
    text-align: center;
}

.login-title {
    font-size: 32px;
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 30px;
    text-align: left;
}

.form-label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    font-size: 20px;
}

.form-input {
    width: 100%;
    padding: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

.submit-button {
    width: 100%;
    padding: 10px;
    background-color: black;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 23px;
    cursor: pointer;
    margin-top: 32px;
    margin-bottom: 20px;
}

.signup-link {
    color: #2970ff;
    text-decoration: none;
    font-size: 16px;
}

.signup-link:hover {
    text-decoration: underline;
}

.error {
    color: red;
}

.demo-login-section {
    margin-top: 30px;
    padding: 20px;
    background-color: #cccccd;
    border-radius: 8px;
    text-align: center;
}

.demo-text {
    font-size: 14px;
    color: #666;
    margin-bottom: 15px;
    font-weight: 600;
}

.demo-button {
    display: block;
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    transition: opacity 0.3s;
}

.demo-button:hover {
    opacity: 0.85;
}

.demo-user {
    background-color: #2970ff;
    color: white;
}

@media (max-width: 850px) {
    .header {
        padding: 15px 20px;
        margin-bottom: 35px;
    }

    .logo img {
        height: 18px;
    }

    .form-container {
        max-width: 70%;
    }
}

@media (max-width: 767px) {
    .header {
        padding: 15px 20px;
        margin-bottom: 30px;
    }

    .logo img {
        height: 14px;
    }

    .form-container {
        max-width: 90%;
    }

    .login-form {
        margin-top: 40px;
    }

    .login-title {
        font-size: 28px;
    }

    .form-label {
        font-size: 18px;
    }

    .form-group {
        margin-bottom: 25px;
    }

    .form-input {
        padding: 14px;
    }

    .submit-button {
        font-size: 20px;
        padding: 14px;
        margin-top: 20px;
    }
}