*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;

}

.head{
    background-color:white;
    padding: 10px;
    position: sticky;
    top: 0;
}

.head p{
    display: inline-block;
}
main{
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.title{
    color: green;
}
main img{
    width: 200px;
}
.container1{
    margin: 15px 0px;
}
.container1 h3{
    margin: 10px 0px;
}
.container1 p{
    margin: 10px 0px;
}
.container1 ul{
    margin: 10px 0px;
}
.container1 ul li{
    margin: 10px 0px;
}
.b{
    text-align: center;
    margin: 20px 0px;
}
.b a button{
    padding: 10px;
    border-radius: 10px;
    border: 1px solid black;
    background-color: green;
    color: whitesmoke;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s linear;
}
.b a button:hover{
    background-color: grey;
    transform: translateY(-5px);
}

/* Responsive Design - Large Tablets and Small Laptops */
@media (max-width: 1024px) {
    .head {
        padding: 8px;
    }
    
    .head p {
        font-size: 16px;
    }
    
    .title {
        font-size: 1.8rem;
    }
    
    main img {
        width: 180px;
    }
    
    .container1 {
        margin: 12px 0px;
        padding: 0 20px;
    }
    
    .container1 h3 {
        font-size: 1.4rem;
        margin: 8px 0px;
    }
    
    .container1 p {
        font-size: 16px;
        margin: 8px 0px;
    }
    
    .container1 ul {
        margin: 8px 0px;
    }
    
    .container1 ul li {
        font-size: 14px;
        margin: 8px 0px;
        line-height: 1.5;
    }
    
    .b {
        margin: 15px 0px;
    }
    
    .b a button {
        padding: 12px 24px;
        font-size: 16px;
    }
}

/* Medium Tablets */
@media (max-width: 900px) {
    .head {
        padding: 6px;
    }
    
    .head p {
        font-size: 14px;
    }
    
    .title {
        font-size: 1.6rem;
    }
    
    main img {
        width: 160px;
    }
    
    .container1 {
        margin: 10px 0px;
        padding: 0 15px;
    }
    
    .container1 h3 {
        font-size: 1.3rem;
        margin: 6px 0px;
    }
    
    .container1 p {
        font-size: 15px;
        margin: 6px 0px;
    }
    
    .container1 ul {
        margin: 6px 0px;
    }
    
    .container1 ul li {
        font-size: 13px;
        margin: 6px 0px;
        line-height: 1.4;
    }
    
    .b {
        margin: 12px 0px;
    }
    
    .b a button {
        padding: 10px 20px;
        font-size: 14px;
    }
}

/* Small Tablets and Large Phones */
@media (max-width: 768px) {
    .head {
        padding: 5px;
    }
    
    .head p {
        font-size: 13px;
    }
    
    .title {
        font-size: 1.4rem;
    }
    
    main img {
        width: 140px;
    }
    
    .container1 {
        margin: 8px 0px;
        padding: 0 12px;
    }
    
    .container1 h3 {
        font-size: 1.2rem;
        margin: 5px 0px;
    }
    
    .container1 p {
        font-size: 14px;
        margin: 5px 0px;
    }
    
    .container1 ul {
        margin: 5px 0px;
    }
    
    .container1 ul li {
        font-size: 12px;
        margin: 5px 0px;
        line-height: 1.3;
    }
    
    .b {
        margin: 10px 0px;
    }
    
    .b a button {
        padding: 8px 16px;
        font-size: 13px;
    }
}

/* Mobile Phones - Portrait */
@media (max-width: 480px) {
    .head {
        padding: 4px;
    }
    
    .head p {
        font-size: 12px;
    }
    
    .title {
        font-size: 1.2rem;
    }
    
    main img {
        width: 120px;
    }
    
    .container1 {
        margin: 6px 0px;
        padding: 0 10px;
    }
    
    .container1 h3 {
        font-size: 1.1rem;
        margin: 4px 0px;
    }
    
    .container1 p {
        font-size: 13px;
        margin: 4px 0px;
    }
    
    .container1 ul {
        margin: 4px 0px;
    }
    
    .container1 ul li {
        font-size: 11px;
        margin: 4px 0px;
        line-height: 1.2;
    }
    
    .b {
        margin: 8px 0px;
    }
    
    .b a button {
        padding: 6px 12px;
        font-size: 12px;
    }
}

/* Extra Small Phones */
@media (max-width: 360px) {
    .head {
        padding: 3px;
    }
    
    .head p {
        font-size: 11px;
    }
    
    .title {
        font-size: 1.1rem;
    }
    
    main img {
        width: 100px;
    }
    
    .container1 {
        margin: 5px 0px;
        padding: 0 8px;
    }
    
    .container1 h3 {
        font-size: 1rem;
        margin: 3px 0px;
    }
    
    .container1 p {
        font-size: 12px;
        margin: 3px 0px;
    }
    
    .container1 ul {
        margin: 3px 0px;
    }
    
    .container1 ul li {
        font-size: 10px;
        margin: 3px 0px;
        line-height: 1.1;
    }
    
    .b {
        margin: 6px 0px;
    }
    
    .b a button {
        padding: 5px 10px;
        font-size: 11px;
    }
}

/* Landscape Mode - Mobile and Tablet */
@media (orientation: landscape) and (max-width: 900px) {
    .title {
        font-size: 1.4rem;
    }
    
    main img {
        width: 120px;
    }
    
    .container1 {
        margin: 6px 0px;
        padding: 0 15px;
    }
    
    .container1 h3 {
        font-size: 1.2rem;
    }
    
    .container1 p {
        font-size: 13px;
    }
    
    .container1 ul li {
        font-size: 12px;
    }
}

@media (orientation: landscape) and (max-width: 700px) {
    .title {
        font-size: 1.2rem;
    }
    
    main img {
        width: 100px;
    }
    
    .container1 {
        padding: 0 10px;
    }
    
    .container1 h3 {
        font-size: 1.1rem;
    }
    
    .container1 p {
        font-size: 12px;
    }
    
    .container1 ul li {
        font-size: 11px;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    main img {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Print Styles */
@media print {
    .head {
        display: none !important;
    }
    
    .b a button {
        display: none !important;
    }
    
    .container1 {
        page-break-inside: avoid;
    }
    
    main img {
        max-width: 200px;
        height: auto;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .b a button:hover {
        transform: none;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .head {
        background-color: #2a2a2a;
        color: #fff;
    }
    
    .title {
        color: #4CAF50;
    }
    
    .container1 h3 {
        color: #4CAF50;
    }
    
    .container1 p,
    .container1 ul li {
        color: #fff;
    }
    
    .b a button {
        background-color: #4CAF50;
        color: white;
    }
    
    .b a button:hover {
        background-color: #45a049;
    }
}