/* Tổng thể */
body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* Container chính */
.container {
    max-width: 400px;
    width: 100%;
    padding: 20px;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

/* Tiêu đề */
h1 {
    color: #007BFF;
    margin-bottom: 20px;
    font-size: 24px;
}

/* Nhãn và input */
label {
    font-weight: bold;
    display: block;
    margin-bottom: 10px;
    font-size: 16px;
}

input[type="text"] {
    width: 95%;
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Nút bấm */
button {
    width: 100%;
    padding: 10px;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
    background-color: #0056b3;
    transform: scale(1.05);
}

/* Kết quả */
.result {
    margin-top: 20px;
    padding: 10px;
    background-color: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    text-align: left;
}

.result p {
    margin: 5px 0;
    font-size: 16px;
    line-height: 1.5;
}