/* General body styles */
body {
    background-image: url("https://bcp.cdnchinhphu.vn/344443456812359680/2024/12/27/ban-sao-cua-dji-0971-gui-2239-4856jpg-167-5490-17352676195222110898688.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    font-family: 'Be Vietnam Pro', sans-serif;
    margin: 0;
    padding: 0;
}

/* Navbar */
.nav-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #ccc;
}

.nav-bar a {
    text-decoration: none;
    color: black;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.nav-bar a:visited {
    color: black;
}

/* Header section */
.header {
    margin-top: 100px;
    margin-bottom: 100px;
    text-align: center;
    margin-left: 10%;
    margin-right: 10%;
}

.header h1 {
    background-color: #6F826A;
    color: white;
    padding: 15px;
    border-radius: 10px;
}

.header h3 {
    background-color: #504B38;
    color: white;
    font-weight: 300;
    padding: 10px;
    margin-top: 10px;
    border-radius: 10px;
}

/* Introduction section */
.intro {
    margin-top: 100px;
    display: flex;
    flex-direction: row;
    background-color: white;
    padding: 40px;
    margin: 40px auto;
    max-width: 1100px;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.intro img {
    height: 300px;
    width: auto;
    margin-right: 30px;
}

.description p {
    margin-bottom: 1em;
}

/* Sub-header before activities */
.sub-header {
    background-color: rgb(208, 233, 208);
    text-align: center;
    padding: 40px 20px 10px;
}

.sub-header h1 {
    margin: 0;
}

/* Activities section */
.activities {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    padding: 40px 20px;
    background-color: rgb(208, 233, 208);
}

.act {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 300px;
    background-color: white;
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: center;
}

.activities img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
}

.act h3 {
    margin-bottom: 10px;
    font-size: 1.2em;
}

.act p {
    margin-top: 0;
    font-size: 0.95em;
}

.act:hover {
    transform: scale(1.05);
}

/* Your Guide section */
#your-guide {
    background-color: white;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    padding: 60px 20px;
    gap: 40px;
    flex-wrap: wrap;
}

#your-guide img {
    width: 300px;
    height: auto;
    border-radius: 20px;
    object-fit: cover;
}

.bio {
    max-width: 500px;
}

.bio h3 {
    margin-bottom: 10px;
}

.bio p {
    margin-top: 0;
    line-height: 1.5;
}

/* Responsive Layout */
@media screen and (max-width: 768px) {
    .intro,
    #your-guide {
        flex-direction: column;
        text-align: center;
    }

    .intro img,
    #your-guide img {
        width: 90%;
        height: auto;
        margin: 0 auto 20px;
    }

    .bio {
        margin: 0;
        padding: 0 20px;
    }

    .header {
        margin-left: 20px;
        margin-right: 20px;
    }

    .nav-bar {
        flex-wrap: wrap;
        gap: 15px;
    }

    .activities {
        flex-direction: column;
        align-items: center;
    }
}