*{
    box-sizing: border-box;
    padding: 0;
    margin: 0;
    font-family: 'Phetsarath OT';
    font-weight: bold;

}

 nav{
            background-color: #101856;
            z-index: 1;
            position: relative;
            position: fixed;
            top: 0;
            width: 100%;
            display: flex;
            height: 80px;
            justify-content:space-around;
            align-items: center;
            border-bottom: #ffffff 5px ridge ;
             
            
        }
        .logo img{
            width: 100px;
            height: 100px;
        }
        .menu{
            list-style: none;
            display: flex;
            margin-right: 20px;
            gap: 20px;
            margin-top: 20px;
            li{
                font-weight: bold;
                
            }
            a{
                text-decoration: none;
                color: rgb(255, 255, 255);
                font-family: 'Phetsarath OT';
                font-size: 15px;

            }

        }
        .menu a:hover{
         color: #0300c5;
         border-bottom: 2px solid #0300c5;

        }
        .icons{
            display: flex;
            gap: 20px;
            margin-right: 20px;
        }
        .icons a img{
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background-color: rgba(136, 136, 136, 0.493);
            padding: 5px;
        }
        .icons a img:hover{
            background-color:#6690ff;
        }

    header button:hover{
            background-color: rgb(57, 232, 255);
        }
                .background-img{
            width: 100%;
            height: 350px;
            background-color: #ffffff;
            margin-top: 70px;
            color:#261FB3;
        }
            .background-img h1{
            margin-top: -70px;
            padding-top: 30px;
            padding-left: 100px;
            font-size: 70px;
            font-family: 'Phetsarath OT';
        }
.content{
    padding-left: 310px;
    margin-top: -50px;
     border-bottom: #0300c541 20px ridge;
     border-top: #0300c542 20px dashed;
     border-radius: 500px 500px;
}
.content img{
    width: 750px;
    height: 500px;
    border-radius: 20px;
    
}
.content p{
    width: 750px;
    text-align: justify;
    color: #001d7c;
}

        footer{
            width: 100%;
            height: 400px;
            background-color: #101856;
            position: relative;

        }
        .box-9{
            display: flex;
            background-color: #4ddbdb00;
            width: 100%;
            height: 400px;
            justify-content: space-between;
            padding-right: 100px;

        }
        .box-10{
            width: 300px;
            height: 300px;
            
        }
        .box-10 img{
            width: 150px;
            height: 150px;
            margin-left: 105px;
        }
        .box-10 p{
            width: 300px;
            margin-left: 50px;
            color: #fff;
            margin-top: -20px;
            font-family:'Phetsarath OT' ;

        }
        .box-11{
            font-family:'Phetsarath OT' ;
            margin-top: 50px;
            color: #fff;
            font-size: 18px;
            margin-right: 50px;
        }
        .box-12{
            font-family:'Phetsarath OT' ;
            margin-top: 50px;
            margin-right: 10px;
            color: #fff;
            font-size: 18px;
        }
        .box-13{
            display: flex;
            justify-content: space-between;
        }
        .box-14{
            font-size: 20px;
            color: rgb(255, 255, 255);
            margin-left: 40px;
            margin-top: -130px;
            font-family:'Phetsarath OT' ;

        }
        .box-15{
            margin-right: 100px;
            margin-top: -90px;
        }
        .box-15 img{
            width: 45px;
            height: 45px;
            background-color: #57575794;border-radius: 50%;
            padding: 5px;
        }
        .footer-1{
            width: 100%;
            height: 50px;
            background-color:#101856;
            position: relative;
            align-items: center;
            display: flex;
            justify-content: space-between;
            padding-right: 100px;
            font-family:'Phetsarath OT' ;
            padding-left: 40px;
            color: #ffffff;
            a{
                color: #ffffff;
            }

        }


/* ======================================== */
/* เริ่มส่วน RESPONSIVE ที่เพิ่มเข้ามาใหม่ */
/* ======================================== */

/* Tablet - หน้าจอขนาดกลาง (768px - 1024px) */
@media screen and (max-width: 1024px) {
    nav {
        height: 70px;
        padding: 0 20px;
    }
    
    .logo img {
        width: 80px;
        height: 80px;
    }
    
    .menu {
        gap: 15px;
        font-size: 14px;
    }
    
    .menu a {
        font-size: 13px;
    }
    
    .icons {
        gap: 15px;
    }
    
    .background-img {
        height: 280px;
        margin-top: 70px;
    }
    
    .background-img h1 {
        margin-top: -50px;
        padding-top: 25px;
        padding-left: 50px;
        font-size: 50px;
    }
    
    .content {
        padding-left: 50px;
        padding-right: 50px;
        margin-top: -30px;
        border-bottom: #0300c541 15px ridge;
        border-top: #0300c542 15px dashed;
        border-radius: 300px 300px;
    }
    
    .content img {
        width: 100%;
        max-width: 650px;
        height: auto;
    }
    
    .content p {
        width: 100%;
        max-width: 650px;
        font-size: 15px;
    }
    
    .content h2 {
        font-size: 24px;
    }
    
    footer {
        height: auto;
    }
    
    .box-9 {
        flex-direction: column;
        height: auto;
        padding: 30px 20px;
        align-items: center;
    }
    
    .box-10 {
        margin-bottom: 30px;
    }
    
    .box-10 img {
        margin-left: 75px;
    }
    
    .box-10 p {
        margin-left: 0;
        text-align: center;
    }
    
    .box-11, .box-12 {
        margin: 20px 0;
        text-align: center;
    }
    
    .box-14 {
        margin-left: 20px;
        margin-top: 20px;
        text-align: center;
    }
    
    .box-15 {
        margin-right: 20px;
        margin-top: 20px;
        text-align: center;
    }
    
    .footer-1 {
        flex-direction: column;
        height: auto;
        padding: 20px;
        text-align: center;
        gap: 10px;
    }
}

/* Mobile - หน้าจอขนาดเล็ก (สูงสุด 767px) */
@media screen and (max-width: 767px) {
    /* ทำให้เว็บไซต์เต็มจอมือถือ */
    html, body {
        width: 100%;
        overflow-x: hidden;
        -webkit-text-size-adjust: 100%;
    }
    
    nav {
        height: auto;
        min-height: 70px;
        flex-direction: column;
        justify-content: center;
        padding: 10px 5px;
        gap: 8px;
        width: 100%;
        border-bottom: #ffffff 3px ridge;
    }
    
    .logo {
        order: 1;
        display: flex;
        justify-content: center;
        width: 100%;
    }
    
    .logo img {
        width: 55px;
        height: 55px;
    }
    
    .menu {
        order: 2;
        flex-wrap: wrap;
        justify-content: center;
        gap: 5px 12px;
        margin: 0;
        padding: 0;
        width: 100%;
    }
    
    .menu li {
        margin: 0;
        padding: 0;
    }
    
    .menu a {
        font-size: 12px;
        padding: 4px 8px;
        display: inline-block;
    }
    
    .icons {
        order: 3;
        gap: 12px;
        margin: 0;
        justify-content: center;
        width: 100%;
    }
    
    .icons a img {
        width: 26px;
        height: 26px;
        padding: 4px;
    }
    
    .background-img {
        width: 100%;
        height: 220px;
        margin-top: 150px;
    }
    
    .background-img h1 {
        margin-top: 0;
        padding-top: 40px;
        padding-left: 15px;
        padding-right: 15px;
        font-size: 32px;
        text-align: center;
        word-wrap: break-word;
    }
    
    .content {
        width: 100%;
        padding: 30px 15px;
        margin-top: 0;
        border-bottom: #0300c541 12px ridge;
        border-top: #0300c542 12px dashed;
        border-radius: 100px 100px;
    }
    
    .content h1 {
        font-size: 26px;
        margin-bottom: 15px;
        word-wrap: break-word;
        text-align: center;
    }
    
    .content h2 {
        font-size: 22px;
        margin: 15px 0 10px 0;
        word-wrap: break-word;
    }
    
    .content h3 {
        font-size: 18px;
        margin: 12px 0 8px 0;
        word-wrap: break-word;
    }
    
    .content img {
        width: 100%;
        max-width: 100%;
        height: auto;
        border-radius: 15px;
        margin: 15px 0;
    }
    
    .content p {
        width: 100%;
        max-width: 100%;
        font-size: 14px;
        line-height: 1.6;
        margin-bottom: 15px;
        word-wrap: break-word;
        overflow-wrap: break-word;
        text-align: justify;
    }
    
    .content ul, .content ol {
        padding-left: 25px;
        margin-bottom: 15px;
    }
    
    .content li {
        font-size: 14px;
        line-height: 1.6;
        margin-bottom: 8px;
        word-wrap: break-word;
    }
    
    header button {
        width: 100%;
        max-width: 300px;
        height: 50px;
        font-size: 16px;
        margin: 20px auto;
        display: block;
    }
    
    footer {
        width: 100%;
    }
    
    .box-9 {
        width: 100%;
        padding: 20px 10px;
    }
    
    .box-10 {
        width: 100%;
        text-align: center;
    }
    
    .box-10 img {
        margin-left: auto;
        margin-right: auto;
        display: block;
        width: 120px;
        height: 120px;
    }
    
    .box-10 p {
        width: 100%;
        margin-left: 0;
        padding: 0 15px;
        font-size: 14px;
        line-height: 1.6;
    }
    
    .box-11, .box-12 {
        font-size: 14px;
        text-align: center;
        width: 100%;
        margin: 15px 0;
        padding: 0 10px;
        line-height: 1.6;
    }
    
    .box-13 {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    
    .box-14 {
        font-size: 15px;
        margin-left: 0;
        margin-top: 30px;
        width: 100%;
        text-align: center;
        padding: 0 10px;
    }
    
    .box-15 {
        margin-right: 0;
        margin-top: 20px;
        text-align: center;
        width: 100%;
    }
    
    .box-15 img {
        width: 40px;
        height: 40px;
        margin: 5px;
    }
    
    .footer-1 {
        width: 100%;
        padding: 15px 10px;
        font-size: 13px;
        line-height: 1.5;
    }
}

/* Mobile ขนาดเล็กมาก (สูงสุด 480px) */
@media screen and (max-width: 480px) {
    .background-img {
        height: 180px;
        margin-top: 140px;
    }
    
    .background-img h1 {
        padding-top: 30px;
        font-size: 26px;
    }
    
    .content {
        padding: 25px 12px;
        border-bottom: #0300c541 10px ridge;
        border-top: #0300c542 10px dashed;
        border-radius: 80px 80px;
    }
    
    .content h1 {
        font-size: 22px;
    }
    
    .content h2 {
        font-size: 20px;
    }
    
    .content h3 {
        font-size: 16px;
    }
    
    .content p, .content li {
        font-size: 13px;
    }
    
    .content img {
        border-radius: 12px;
        margin: 12px 0;
    }
    
    header button {
        max-width: 250px;
        height: 45px;
        font-size: 15px;
    }
    
    .box-10 p, .box-11, .box-12 {
        font-size: 13px;
    }
    
    .footer-1 {
        font-size: 12px;
    }
}

/* Landscape mode สำหรับ Mobile */
@media screen and (max-height: 500px) and (orientation: landscape) {
    nav {
        min-height: 50px;
    }
    
    .logo img {
        width: 50px;
        height: 50px;
    }
    
    .background-img {
        height: 150px;
        margin-top: 80px;
    }
    
    .background-img h1 {
        padding-top: 25px;
        font-size: 28px;
    }
    
    .content {
        padding: 20px 15px;
    }
    
    .menu {
        gap: 8px;
        margin: 5px 0;
    }
    
    .menu a {
        font-size: 11px;
    }
}