/* Thiết lập chung cho toàn bộ trang */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    max-width: 960px;
    margin: auto;
    padding: 0 20px;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    border-bottom: #77aaff 3px solid;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

header nav ul {
    list-style: none;
    padding: 0;
    margin-top: 10px;
}

header nav ul li {
    display: inline;
    margin: 0 15px;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px 0;
}

section {
    background: #fff;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

section h2 {
    color: #5a5a5a;
    border-bottom: 2px solid #5a5a5a;
    padding-bottom: 10px;
}

.project-card {
    background: #f9f9f9;
    padding: 15px;
    border-left: 5px solid #77aaff;
    margin-bottom: 15px;
}

footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    margin-top: 20px;
}