body, header, nav, main, footer, ul, li, h1, h2, address, p, ul, li, section, div, video, span, button, a, figure, img, iframe{margin: 0; padding: 0; box-sizing: border-box;}
body {font-family: "Roboto", sans-serif; font-optical-sizing: auto; font-weight: normal; font-style: normal; font-variation-settings: "wdth" 100; font-size: 18px; line-height: 1.6; color: #333; overflow-x: hidden; }
body {word-break: keep-all;}
li {list-style: none;}

a {text-decoration: none;}
a:visited {color: #000;} 

button {border: none; cursor: pointer;}
video {height: 100%;}

#scrollToTop {z-index: 101;}

.desktop {display: none;}
.inner {padding: 0 15px;}
.btn {border: 1px solid #aaa; border-radius: 50px; padding: 7px 15px; margin-top: 20px; display: inline-block; color: white !important; background-color: rgba(0, 0, 0, 0.5); transition: all 1s;}
.btn:hover {background-color: #ff7d00; border: 1px solid #ff7d00;}
.section {padding: 50px 30px;}
.etc {font-size: 14px; color: #666; margin-top: 10px;}

h2 {margin-bottom: 20px;}
/* h2::before {content: ""; position: relative; top: -3px; width: 10px; height: 10px; background-color: #ff7d00; display: block;} */

.darium {padding: 0; text-align: center; background-color: #fff; width: 100%; box-sizing: border-box; position: fixed; left: 0; width: 100%; z-index: 100;}

.darium nav .inner.khu {padding-top: 5px; overflow: hidden; transition: all 1s;}
.darium nav .inner.khu img {width: 100%; max-width: 280px;}

.darium nav .inner.h1 {border-top: 1px solid #ddd; padding-top:  10px; padding-bottom:  10px; cursor: pointer;}
.darium nav .inner h1 {font-size: 12px; display: flex; align-items: center; gap: 5px; justify-content: center; margin: 0;}
.darium nav .inner h1 img {width: 100px;}
    
.darium nav ul {display: flex; align-items: center; font-weight: bold; gap: 10px; margin: 0;justify-content: center; padding: 5px 15px; border-top: 1px solid #ddd; font-size: 14px; border-bottom: 1px solid #ddd; background-color: #eee;}
.darium nav ul li {list-style: none;}
.darium nav ul li a {text-decoration: none; color: #333;  border-bottom: 2px solid transparent; transition: all 1s; padding: 8px 0px; display: block; cursor: pointer;}
.darium nav ul li a:hover {border-bottom: 2px solid #ff7d00;}
.darium nav ul li:nth-child(1) {display: none;}
.darium nav ul li:nth-child(5) a {background-color: #ff7d00; color: white; border-radius: 30px; border-bottom: 2px solid transparent; padding: 4px 8px; }
.darium nav ul li:nth-child(5) a:hover {background-color: #000;}

.mainVisual {height: 100vh;}
.mainVisual .item {height: 100vh; color: white; background-size: cover; background-position-x: center; background-position-y: center; display: flex; flex-direction: column; justify-content: center; }
.mainVisual .item.img1 {background-image: url("https://cdn.imweb.me/thumbnail/20251030/92973e637ac54.png");}
.mainVisual .item.img2 {background-image: url("https://cdn.imweb.me/thumbnail/20251030/559cb900e7d68.png");}
.mainVisual .item.img3 {background-image: url("https://cdn.imweb.me/thumbnail/20170813/598f91b902662.jpeg");}
.mainVisual .item p {font-size: 14px; text-align: center;}
.mainVisual .item p span {margin-top: 10px; display: block; color: #ffdf76; }
.mainVisual .item .btn {width: fit-content; margin: 20px auto 0;}
.mainVisual .item img {max-width: 900px; display: inline-block; }

#section_intro {background-color: #000; color: #fff;}
#section_intro p {margin-bottom: 10px;}
#section_logos img {width: 100%;}
#section_video {background-image: url("https://cdn.imweb.me/thumbnail/20251030/69830d27a9af1.jpg"); background-size: cover; padding: 30px; text-align: center;}
#section_video video {width: 100%; max-width: 900px;}
#section_video iframe {max-width: 900px; width: 100%; height: 650px; } 

#section_curriculum h3 {background-color: #eee; padding: 10px; margin: 50px 0 10px 0;}
#section_curriculum h3 .red {color: red;}
#section_curriculum h3 span {font-size: 14px; color: #666; display: block; font-weight: normal;}

.class {width: 100%; border-collapse: collapse; font-size: 15px;}
.class td {border-bottom: 1px solid #999; padding: 10px 0}
.class td span {color: #ff7d00;}
.class td:nth-child(1) {color: rgb(102, 102, 102); width: 110px;}
.class td:nth-child(2) {font-weight: bold; color: #333;}

#section_class {background-color: #000; color: white; padding: 100px 0;}
/* #section_class div {display: grid; grid-template-columns: repeat(3, 1fr); gap: 0px;} */
/* #section_class div img {width: 100%; height: auto; object-fit: cover;} */
#section_class h2 {padding: 0 30px;}

#section_gallery .container {display: grid; grid-template-columns: repeat(4, 1fr); gap: 5px;}
#section_gallery .container img {width: 100%; display: block;}


.class-grid { display: grid; grid-template-columns: repeat(5, 1fr); padding: 20px 0; }
.class-grid {gap: 20px;}
.class-item {border-radius: 8px;}
.class-item { position: relative; overflow: hidden; cursor: pointer; aspect-ratio: 1; }
.class-item img { height: 100%; object-fit: cover; transition: transform 0.3s ease; transform: scale(1.1); }
.class-item:hover img { transform: scale(1.2); }
.class-overlay { position: absolute; bottom: 0; left: 0; right: 0; background: linear-gradient(to top, rgba(0,0,0,0.9), transparent); color: white; padding: 20px; transform: translateY(100%); transition: transform 0.3s ease; }
.class-item:hover .class-overlay { transform: translateY(0); }
.class-overlay h3 { margin: 0 0 5px 0; font-size: 16px; font-weight: bold; }
.class-overlay p { margin: 0; font-size: 14px; opacity: 0.9; }
.modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.9); animation: fadeIn 0.3s; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-content { margin: auto; display: block; max-width: 90%; max-height: 80%; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); animation: zoomIn 0.3s; }
@keyframes zoomIn { from { transform: translate(-50%, -50%) scale(0.8); } to { transform: translate(-50%, -50%) scale(1); } }
.modal-close { position: absolute; top: 20px; right: 40px; color: #fff; font-size: 40px; font-weight: bold; cursor: pointer; transition: color 0.3s; }
.modal-close:hover { color: #ccc; }
.modal-caption { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); color: #fff; text-align: center; padding: 10px 20px; background: rgba(0,0,0,0.7); border-radius: 5px; }
.modal-caption h3 { margin: 0 0 5px 0; }
.modal-caption p { margin: 0; opacity: 0.8; }

#section_class .etc {color: white; text-align: center;}

@media (max-width: 1200px) { .class-grid { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 768px) { .class-grid { grid-template-columns: repeat(3, 1fr); gap: 15px; } }
@media (max-width: 480px) { .class-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; } }



#section_registration {background-color: #ddd;}
#section_registration .container {max-width: 1400px; margin: 0 auto; padding: 60px 0px;}
#section_registration .section-grid {display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 40px;}
#section_registration .card {position: relative; background: #fff; border-radius: 12px; overflow: hidden; box-shadow: 0 2px 20px rgba(0,0,0,0.08); transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); cursor: pointer;}
#section_registration .card:hover {transform: translateY(-10px); box-shadow: 0 12px 40px rgba(0,0,0,0.15);}
#section_registration .card-image {width: 100%; height: 320px; overflow: hidden; position: relative;}
#section_registration .card-image img {width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1); margin-top: -20px;}
#section_registration .card:hover .card-image img {transform: scale(1.08);}
#section_registration .card-content {padding: 10px 30px 30px; position: relative;}
#section_registration .card-title {font-size: 28px; font-weight: 700; color: #1a1a1a; margin-bottom: 10px; letter-spacing: -0.5px; }
#section_registration .card-description {font-size: 16px; line-height: 1.7; color: #666; margin-bottom: 15px; min-height: 60px;}
#section_registration .more-btn {display: inline-flex; align-items: center; gap: 12px; background: #ff6b35; color: #fff; padding: 14px 28px; border-radius: 50px; text-decoration: none; font-weight: 600; font-size: 15px; transition: all 0.3s ease; border: none; cursor: pointer;}
#section_registration .more-btn:hover {background: #ff5522; gap: 18px; padding-right: 50px;}
#section_registration .more-btn::before {content: '→'; font-size: 20px; transition: transform 0.3s ease;}
#section_registration .more-btn:hover::before {transform: translateX(3px);}
#section_registration p {font-size: 15px;}
#section_registration .card-date {border-bottom: 1px solid #aaa; padding-bottom: 10px; margin-bottom: 10px; color: #000}
#section_registration h3 {margin-top: 0;}

.header-title {text-align: center; font-size: 48px; font-weight: 800;  letter-spacing: -1px; display: inline-block; width: 100%;}
.header-title::after {content: ''; position: relative; left: 50%; margin-left: -30px; display: block; width: 60px; height: 4px; background: linear-gradient(90deg, #ff6b35, #ff8c5a); border-radius: 2px;}



footer {background-color: #000; color: white; font-size: 14px; padding-top: 30px !important; padding-bottom: 30px !important;}
footer img {width: 150px;}
footer h2 {width: initial; font-size: 0;}
footer a {color: #ff7d00;}
footer a:hover {}

/* scrollTop */
.scroll-to-top { position: fixed; bottom: 60px; right: 20px; width: 60px; height: 60px; background: #e74c3c; border: none; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 20px rgba(231, 76, 60, 0.3); opacity: 0; visibility: hidden; transform: translateY(20px); transition: all 0.3s ease; }
.scroll-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.scroll-to-top:hover { background: #c0392b; transform: translateY(-2px); box-shadow: 0 6px 25px rgba(231, 76, 60, 0.4); }
.scroll-to-top:active { transform: translateY(0); box-shadow: 0 2px 15px rgba(231, 76, 60, 0.3); }
.scroll-to-top::before { content: ''; width: 0; height: 0; border-left: 8px solid transparent; border-right: 8px solid transparent; border-bottom: 12px solid white; }
@keyframes bounce { 0%, 20%, 50%, 80%, 100% { transform: translateY(0); } 40% { transform: translateY(-5px); } 60% { transform: translateY(-3px); } }
.scroll-to-top.bounce { animation: bounce 1s ease-in-out; }

@media (max-width: 1024px) {
    #section_registration .section-grid {grid-template-columns: repeat(2, 1fr); gap: 25px;}
    #section_registration .card-image {height: 280px;}
    .header-title {font-size: 40px;}
    #section_video iframe {height: 600px; } 
}

@media (max-width: 768px) {
    #section_registration .section-grid {grid-template-columns: 1fr; gap: 20px;}
    #section_registration .container {padding: 40px 30px;}
    #section_registration .card-image {height: 260px;}
    #section_registration .card-content {padding: 10px 24px 30px;}
    #section_registration .card-title {font-size: 24px;}
    #section_registration .card-description {font-size: 15px;}
    .header-title {font-size: 32px;}
    #section_video iframe {height: 500px; } 

}        

@media (max-width: 480px) {
    .header-title {font-size: 28px;}
    #section_registration .card-title {font-size: 22px;}
    #section_registration .more-btn {padding: 12px 24px; font-size: 14px;}
    #section_video iframe {height: 300px; } 
}



#poster h2 {font-size: 0;}


        #poster .container {max-width: 1400px; margin: 0 auto;}
        #poster .image-grid {display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 30px;}
        #poster .image-card {background: #1a1a1a; overflow: hidden; cursor: pointer; transition: transform 0.3s ease, box-shadow 0.3s ease; border: 1px solid #aaa;}
        #poster .image-card:hover {transform: translateY(-8px); box-shadow: 0 12px 40px rgba(255, 255, 255, 0.1);}
        #poster .image-card img {width: 100%; height: auto; display: block; transition: opacity 0.3s ease;}
        #poster .image-card:hover img {opacity: 0.9; cursor: default;}
        #poster .image-card-title {padding: 20px; color: #333; font-size: 1.1rem; font-weight: 600; text-align: center; background-color: white;}
        
        /* Modal Styles */
        /* #poster .modal_poster {display: none; position: relative; z-index: 1000; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.95); opacity: 0; transition: opacity 0.3s ease; border: 10px solid red;}
        #poster .modal_poster.active {display: flex; align-items: center; justify-content: center; opacity: 1; border: 10px solid red;}
        #poster .modal-content {position: relative; max-width: 90%; max-height: 90vh; animation: modalZoom 0.3s ease;} */
        
        @keyframes modalZoom {
            from {transform: scale(0.8); opacity: 0;}
            to {transform: scale(1); opacity: 1;}
        }
        
        #poster .modal-content img {width: 100%; height: auto; border-radius: 8px; box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);}
        #poster .close-btn {position: absolute; top: -50px; right: 0; color: #fff; font-size: 40px; font-weight: 300; cursor: pointer; transition: color 0.3s ease; line-height: 1; padding: 10px 20px;}
        #poster .close-btn:hover {color: #ff4444;}
        #poster .modal-nav {position: absolute; top: 50%; transform: translateY(-50%); color: #fff; font-size: 50px; font-weight: 300; cursor: pointer; padding: 20px; background: rgba(0, 0, 0, 0.5); border-radius: 50%; width: 80px; height: 80px; display: flex; align-items: center; justify-content: center; transition: background 0.3s ease;}
        #poster .modal-nav:hover {background: rgba(255, 255, 255, 0.1);}
        #poster .modal-prev {left: -120px;}
        #poster .modal-next {right: -120px;}

        #poster #modalImage {height: 80vh;}
        
        @media (max-width: 768px) {
            #poster .image-grid {grid-template-columns: 1fr; gap: 20px;}
            #poster .modal-content {max-width: 95%;}
            #poster .modal-nav {font-size: 30px; width: 50px; height: 50px; padding: 10px;}
            #poster .modal-prev {left: 10px;}
            #poster .modal-next {right: 10px;}
            #poster .close-btn {top: -40px; font-size: 30px;}
        }


        

@media screen and (min-width: 768px) {
    .desktop {display: block;}
    .section {padding: 100px;}
    h2 {width: fit-content; margin: 0 auto 30px; font-size: 40px;}
    h3 {font-size: 30px;}
    h3 span {font-size: 16px; color: #666; display: inline;}

    .mobile {display: none;}
    .darium nav .inner h1 img {display: block; width: 130px; position: relative;}
    .darium nav .inner h1 {font-size: 18px; }
    .darium nav ul {font-size: 16px;}
    .darium nav ul li:nth-child(5) a {padding: 4px 12px 2px 12px; }
    .mainVisual .item img {margin: 0 auto; }
    .mainVisual .item p {font-size: 16px; text-align: center;}

    #section_intro, #section_curriculum {text-align: center;}
    #section_video {padding: 100px;}

    #section_curriculum h3 {width: 800px; margin: 80px auto 0;}
    .class {width: 800px; margin: 0 auto;}
    .class td {line-height: 50px; text-align: left;}
    .etc {width: 800px; margin: 10px auto; text-align: left;}

    
}

@media screen and (min-width: 1280px) {
    .darium {padding: 10px 20px;}
    .darium nav .inner {padding: 0;}
    .darium {border-bottom: 1px solid #ccc;}
    .darium nav {display: flex; justify-content: space-between; align-items: center;}
    .darium nav .inner.khu img {width: 330px;  max-width: 330px;}
    .darium nav .inner.h1 {border-top: none; padding: 0;}
    .darium nav ul {background-color: transparent; border: none; padding: 0;}
}
@media screen and (min-width: 1440px) {
    .darium nav ul { gap: 15px;}
    .darium nav .inner.khu img {width: 340px;  max-width: 340px;}
    .darium nav .inner h1 {font-size: 22px; }
    .darium nav ul li:nth-child(5) a {padding: 6px 15px;}
}
@media screen and (min-width: 1600px) {
    #section_gallery .container {grid-template-columns: repeat(7, 1fr);  gap: 20px;}
}