/* CSS chung */
body {
    font-family: 'Montserrat', sans-serif;
    background-color: #E0FFFF; /* Turquoise nhẹ cho background tổng */
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header, footer {
    background-color: #40E0D0; /* Turquoise đậm cho header và footer */
    color: white;
    text-align: center;
    padding: 15px;
    border-radius: 15px;
    width: 80%;
    margin-bottom: 20px;
}

nav a {
    margin: 0 15px;
    color: white;
    text-decoration: none;
}

nav a:hover {
    text-decoration: underline;
}

main {
    width: 80%;
    flex-grow: 1;
}

.content-section {
    background-color: #FFFFFF;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    font-size: 28px;
    color: #40E0D0;
    margin-bottom: 15px;
}

h2 {
    font-size: 24px;
    color: #48D1CC; /* Turquoise hài hòa hơn */
    margin-bottom: 10px;
}

h3 {
    font-size: 20px;
    color: #40E0D0;
    margin-bottom: 10px;
}

h4 {
    font-size: 18px;
    color: #48D1CC;
    margin-bottom: 5px;
}

ul {
    list-style-type: none; /* Bỏ dấu chấm đầu dòng */
    padding-left: 0;
}

ul ul {
    padding-left: 20px; /* Thụt đầu dòng cho cấp con */
}

ol {
    padding-left: 20px; /* Thụt đầu dòng cho danh sách có thứ tự */
}

.text-content {
    text-align: left;
    margin: 0 auto;
    max-width: 600px;
}

img {
    display: block;
    margin: 0 auto 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th, td {
    border: 1px solid #40E0D0;
    padding: 10px;
    text-align: left;
}

form {
    max-width: 400px;
    margin: 0 auto;
    text-align: left;
}

form label {
    font-weight: 700;
    margin-bottom: 5px;
    display: block;
}

form input[type="text"],
form input[type="email"],
form textarea,
form select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    box-sizing: border-box;
    border: 1px solid #40E0D0;
    border-radius: 5px;
    font-family: 'Montserrat', sans-serif;
}

form input[type="submit"] {
    padding: 10px 20px;
    background-color: #40E0D0;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Montserrat', sans-serif;
}

form input[type="submit"]:hover {
    background-color: #33C4B6;
}