html, body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: black;
    color: white;
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Sidebar */
.w3-sidebar {
    width: 120px;
    background: #222;
    position: fixed;
    height: 100%;
    padding-top: 20px;
}

#main {
    margin-left: 140px;
    width: calc(100% - 140px);
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

/* Main Sections */
main {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 20px;
    gap: 20px;
}

/* Left Section */
.left {
    text-align: center;
    flex: 1;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.avatar img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    border: 3px solid white;
}

.info-box {
    background: #222;
    padding: 15px;
    margin-top: 10px;
    border-radius: 10px;
    width: 100%;
    text-align: center;
}

/* Right Section - Cards */
.right {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 300px;
    gap: 20px;
}

/* Flipping Card Styles */
.card {
    position: relative;
    width: 300px;
    height: 150px;
    perspective: 1000px;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease-in-out;
    border-radius: 10px;
}

.card:hover .card-inner {
    transform: rotateY(180deg);
}

.card-inner::before, .card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    padding: 20px;
}

/* Specific Background Images */
.teacher::before {
    content: "";
    background: url('https://campus.srmcem.ac.in/ps/css/srmgpc.jpg') center/cover;
}

.tarot::before {
    content: "";
    background: url('https://media.hero-magazine.com/wp-content/uploads/2019/11/18152914/TAROT.jpg') center/cover;
}

.kitchen::before {
    content: "";
    background: url('https://blog.stocktake-online.com/hs-fs/hubfs/how-to-open-cloud-kitchen.jpg?width=1000&height=566&name=how-to-open-cloud-kitchen.jpg') center/cover;
}

.card-back {
    background: #555;
    color: white;
    transform: rotateY(180deg);
    position: absolute;
}

/* Footer */
footer {
    text-align: center;
    font-size: 14px;
    color: #aaa;
    width: 100%;
    padding: 10px 0;
    background: #111;
    margin-top: auto;
}

/* Responsive Adjustments */
@media only screen and (max-width: 768px) {
    .w3-sidebar {
        display: none;
    }
    
    #main {
        margin-left: 0;
        width: 100%;
    }

    main {
        flex-direction: column;
    }
}