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

body {
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.container {
    background-color: #fff;
    padding: 1.5rem;
    border: 2px solid #ff0000;
    border-radius: 0.5rem;
    width: 100%;
    max-width: 28rem; /* Approx 450px */
    box-shadow: 0 0 0.625rem rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #000;
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.cost {
    text-align: center;
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.warning {
    text-align: center;
    color: #ff0000;
    font-size: 0.85rem;
    margin-bottom: 1.25rem;
}

.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-weight: bold;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

label span {
    font-weight: normal;
    font-size: 0.75rem;
    color: #666;
    display: block;
    margin-top: 0.125rem;
}

input, select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 0.25rem;
    font-size: 0.9rem;
    transition: border-color 0.3s;
}

input:focus, select:focus {
    border-color: #007bff;
    outline: none;
}

input[readonly] {
    background-color: #f0f0f0;
    color: #333;
}

.note {
    font-size: 0.75rem;
    color: #ff5555;
    margin-top: 0.25rem;
}

button {
    width: 100%;
    padding: 0.875rem;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 0.25rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
    .container {
        max-width: 90%;
        padding: 1rem;
    }

    h1 {
        font-size: 1.3rem;
    }

    .warning {
        font-size: 0.8rem;
    }

    input, select, button {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .container {
        max-width: 95%;
        padding: 0.75rem;
    }

    h1 {
        font-size: 1.2rem;
    }

    .cost, .warning {
        font-size: 0.75rem;
    }

    label {
        font-size: 0.85rem;
    }

    label span {
        font-size: 0.7rem;
    }

    input, select, button {
        font-size: 0.8rem;
        padding: 0.625rem;
    }

    .note {
        font-size: 0.7rem;
    }
}

@media (min-width: 1200px) {
    .container {
        max-width: 30rem; /* Approx 480px */
        padding: 2rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    .cost {
        font-size: 1rem;
    }

    .warning {
        font-size: 0.9rem;
    }

    input, select, button {
        font-size: 1rem;
    }
}