body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}


header {
    background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.4)), 
                url('https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSaqwOe_h2o-d-OKGOrEl88PvhPcWfpiMFxMg&s');
    background-size: cover;
    background-position: center;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
}

header h1 { font-size: 4rem; margin: 0; letter-spacing: 5px; }
header p { font-size: 1.5rem; }


nav {
    background: #2e7d32;
    padding: 15px 0;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 20px;
    font-weight: bold;
    text-transform: uppercase;
}

nav a:hover { color: #ffeb3b; }


.intro {
    text-align: center;
    padding: 50px 20px;
    background: white;
}

.container {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding: 40px;
    flex-wrap: wrap;
}


.card {
    background: white;
    width: 400px;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    overflow: hidden;
    transition: 0.3s;
}

.card:hover { transform: translateY(-10px); }

.card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.card-body { padding: 20px; text-align: center; }

.btn {
    display: inline-block;
    padding: 10px 25px;
    background: #2e7d32;
    color: white;
    text-decoration: none;
    border-radius: 25px;
    margin-top: 15px;
}

.btn:hover { background: #1b5e20; }

.culture {
    text-align: center;
    padding: 60px 20px;
    background: #e8f5e9;
}

footer {
    background: #222;
    color: white;
    text-align: center;
    padding: 20px 0;
}
/* Tối ưu phần thông tin tác giả */
.author-section {
    padding: 80px 20px;
    background-color: #ffffff;
}

.author-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    background: #fff;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0,0,0,0.05); /* Đổ bóng nhẹ hiện đại */
    border: 1px solid #eee;
}

.author-image-box {
    flex: 1;
    min-width: 350px;
}

.author-image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-content {
    flex: 1.5;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.author-content h3 {
    margin: 0;
    font-size: 24px;
    color: #333;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.divider {
    width: 50px;
    height: 3px;
    background-color: #2e7d32; /* Màu xanh An Giang */
    margin: 15px 0 25px 0;
}

.greeting {
    font-size: 18px;
    color: #444;
    margin-bottom: 10px;
}

.description {
    color: #666;
    line-height: 1.6;
    margin-bottom: 25px;
}

.contact-details {
    list-style: none;
    padding: 0;
}

.contact-details li {
    margin-bottom: 12px;
    font-size: 16px;
    display: flex;
    align-items: center;
}

.contact-details .icon {
    margin-right: 10px;
}

.contact-link {
    color: #007bff;
    text-decoration: none;
    margin-left: 5px;
    transition: 0.2s;
}

.contact-link:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* Tương thích điện thoại */
@media (max-width: 768px) {
    .author-container {
        flex-direction: column;
    }
    .author-image-box {
        min-width: 100%;
        height: 250px;
    }
}