:root {
    --color-primary: #2241db;
    --color-primary-dark: #004aad;
    --color-text-primary: #333;
    --color-text-secondary: #555;
    --color-bg-light: #f6f6f6;
    --color-bg-white: #fff;
    --color-border: #e0e0e0;
    --color-arrow: #ccc;
    --font-main: 'Noto Sans KR', sans-serif;
}

:focus-visible {
  outline: 3px solid var(--color-primary-dark);
  outline-offset: 2px;
  border-radius: 4px;
}
:focus:not(:focus-visible) {
  outline: none;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    font-size: 16px;
}
body {
    font-family: var(--font-main);
    color: var(--color-text-primary);
    line-height: 1.6;
    word-break: keep-all; 
}
a {
    text-decoration: none;
    color: inherit;
}
ul {
    list-style: none;
}
img {
    max-width: 100%;
    height: auto;
}
button {
  all: unset;
  cursor: pointer; 
}

.skip-nav {
    position: absolute;
    left: 0;
    top: -100px;
    width: 100%;
    padding: 10px;
    text-align: center;
    background-color: var(--color-primary-dark);
    color: white;
    font-weight: 700;
    z-index: 9999;
    transition: top 0.3s ease;
}
.skip-nav:focus {
    top: 0;
}
.header {
    padding: 6rem;
}
.header .container {
    padding-top: 20px;
}
.header_logo {
    text-align: center;
}
.header_main {
    text-align: center;
}
.header_title {
    position: relative;
    overflow: hidden;
}
.header_title h1 {
        font-size: 4.5rem;
    font-weight: 100;
    color: var(--color-text-primary);
    line-height: 1.4;
    margin: 3rem;
}
.header_title .subtitle {
    color: var(--color-primary);
}
.header_title strong{
    display: block;
    font-weight: 700;
}
.header_title img{
    margin: 2rem 0;
    position: relative;
    z-index: 2;
}
.bg-watermark-wrapper {
    position: absolute;
    top: 60%;
    left: 0;
    transform: translateY(-50%);
    z-index: 1;
    display: flex;
    white-space: nowrap;
    animation: marquee 30s linear infinite;
}
.bg-watermark-wrapper span {
    font-size: 7rem;
    font-weight: 900;
    color: rgba(0, 0, 0, 0.03);
    padding-right: 2rem;
}
@keyframes marquee {
0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

.button_container {
    margin: 3rem 0 1rem;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    width: 13rem;
    height: 4rem;
    padding: 1rem 1.5rem;
    font-weight: 700;
    font-size: 1rem;
    border-radius: 0.5rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out, border-color 0.2s ease-in-out;
    text-decoration: none;
    white-space: nowrap;
    margin-right: 1.5rem;
}
.btn:nth-last-child(1){
    margin-right: 0;
}
.btn svg {
    width: 1.25rem; 
    height: 1.25rem; 
    fill: currentColor;
}
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-bg-white);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1); 
}
.btn-primary:hover {
    background-color: var(--color-primary-dark);
}
.btn-secondary {
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-border); 
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05); 
}
.btn-secondary:hover {
    background-color: #f9fafb;
}
.nav {
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 999;
}
.nav ul {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    text-align: center;
    justify-items: center;
    max-width: 1200px;
    margin: 0 auto;
}
.nav ul li {
    text-align: center;
    
}
.nav li:last-child {
    border-right: none;
}
.nav a {
    display: block;
    font-size: 1.1rem; 
    position: relative;
    padding: 1rem 0
}
.nav a[aria-current="page"] {
    width: 100%;
    color: var(--color-primary);
    font-weight: 700;
}
.nav a[aria-current="page"]::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    height: 3px;
    background-color: var(--color-primary);
}


.intro_section {
    background-color: var(--color-bg-light);
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.section {
    padding: 6rem 0;
}
.section:last-child {
    border-bottom: none;
}
.intro_title {
    font-size: 2rem; 
    font-weight: 900;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: 10px;
}
.container .intro_txt {
    text-align: center;
}
.list_c, .list_c02{
    display: flex;
    align-items: flex-start;
    flex-direction: column;
    width: max-content;
    margin: 2rem auto; 
}
.list_c li{flex-basis: 2.8rem;}
.list_c02 li{
    list-style:circle;
    margin: 0.3rem 0 0;
}
.list_c02 li::before {
    content: '•'; 
    color: var(--color-text-secondary);
    font-weight: 700;
    font-size: 0.9rem;
    margin-right: -2px;
}

.list_c li, .list_c02 li{
    display: flex;
    align-items: center;
    gap: 13px;
}
.list_c .title, .list_c02 .title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text-primary);
    flex-shrink: 0;
}
.list_c .txt .list_c02 .txt{
    display: flex;
    align-items: center;
    justify-content: left;
    height: 40px;
    padding: 0 0.5rem;

}
.list_c li:nth-child(1) .txt {
    width: 110px;
}
.list_c li:nth-child(2) .txt {
    width: 185px;
}
.list_c li:nth-child(3) .txt {
    width: 245px;
}

.intro_box {
    background-color: var(--color-bg-white);
    border-radius: 0.5rem;
    padding: 3.5rem;
}
.intro_box h3 {
    font-size: 1.25rem;
    margin-bottom: 15px;
}
.intro_box .txt {
    font-size: 0.95rem;
    position: relative;
}
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    border: 0;
}

.info-layer {
    display: block;
    position: absolute;
    top: 4.5em;
    left: 18em;
    width: auto;
    background-color: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: 0.5rem;
    padding: 1.2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 10;
    font-size: 0.9rem;
    text-align: left;
}
.info-layer[hidden] {
    display: none;
}
.info-layer p {
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text-primary);
}
.info-layer ul {
    list-style: none;
    padding-left: 0;
}
.info-layer li {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: 1.2em;
    margin-bottom: 0.25em;
}
.info-layer li::before {
    content: '•';
    position: absolute;
    left: 0;
    top: 0;
    font-weight: 700;
}
.close-layer-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
}

.intro_box .txt .Highlight{
    color: #CC0000;
    font-weight: 700
}
.intro_box .txt #show-layer-link{
    color: var(--color-primary);
    border-bottom: 1px solid  var(--color-primary);
    font-weight: 500;
}
.intro_box hr{
    border: none;
    height: 1px;
    background-color: var(--color-border);
    margin: 2em 0;
}
.intro_box .list {
    padding-left: 1em;
    line-height: 1.7;
}
.intro_box .list > li {
    padding-left: 0.5em;
}

.icon-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    text-align: center;
    margin: 2.5rem 0;
}
.icon_item {
    padding: 2rem 1.5rem;
    background-color: var(--color-bg-light);
    border-radius: 0.5rem;
}
.icon_item img {
    margin: 0 auto 1rem auto;
}
.icon_item strong {
    display: block;
    font-size: 1.1rem;
}
.icon_item p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.4;
}
.stepper {
    width: 100%;
    margin: 2rem auto;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: auto;
    padding-bottom: 1rem;
}
.stepper-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}
.stepper-item {
    display: flex;
    align-items: center;
}
.stepper-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0.75rem 2.25rem;
    border: 1px solid var(--color-border);
    border-radius: 2.5rem;
    font-weight: 700;
    font-size: 1rem;
    min-height: 3.5rem;
    white-space: nowrap; 
}
.stepper-item .fill span {
    font-size: 0.8rem;
    opacity: 0.9;
}
.stepper-item::after {
    content: '>';
    display: inline-block;
    color: var(--color-arrow);
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 1.5rem;
}
.stepper-item:last-child::after {
    display: none;
}
.stepper-item .fill {
    background-color: var(--color-primary);
    color: #ffffff;
}
.stepper-item .b_border {
    border: 3px solid #94bdff;
    font-weight: 700;
}


.benefit_section{    
    background-color: #f9fbff;
}
.benefit_box, .benefit_box_blue {
    width: 100%;
    padding: 0 0 3rem 0;
    background-color: var(--color-bg-white);
    
    margin-top: 2rem;
}
.benefit_box{
    border-top: 2px solid var(--color-text-primary);
}
.benefit_box_blue{
    border-top: 2px solid var(--color-primary);
}
.label, .label_blue {
    display: inline-block;
    padding: 0.5rem 1.3rem;
    color: var(--color-bg-white);
    font-weight: bold;
    font-size: 0.9rem;
}
.label{
    background-color: var(--color-text-primary);
}
.label_blue{
    background-color: var(--color-primary);
}
.box_title {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0.5rem 0 0.8rem 0;
}
.box_list{
    text-align: center;
}
.box_list li {
    line-height: 1.8;
}
.box_list li::before {
    content: '•';
    font-weight: bold;
    margin-right: 0.5em;
}
.box_list .blue{
    color: var(--color-primary);
    font-weight: 600;
}
.box_list li.blue::before {
    display: none;
}
.certification_section {
    background-color: #f9f9f9;
}
.card_grid {
    list-style: none;
    padding: 0;
    margin: 2.5rem auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    max-width: 40rem;
}
.card {
    border-radius: 1rem;
    background-color: var(--color-bg-white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--color-border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.mark_img {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 15rem;
    border-bottom: 1px solid var(--color-border);
}
.card_info {
    padding: 0.6rem;
    text-align: center;
    color: var(--color-bg-white);
}
.card_info .grade {
    display: block;
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.2;
}
.card_info .txt {
    display: block;
    font-size: 0.95rem;
}
.card_info--ex {
    background: linear-gradient(to right bottom, var(--color-primary), #8641db);
}
.card_info--s {
    background: linear-gradient(to right bottom, #00b31b, #86ba2b);
}
.logo_info_list {
    width: max-content;
    margin: 2rem auto 0 auto;
    display: grid;
    gap: 0.5rem;
}
.logo_info_list .list {
    display: flex;
}
.logo_info_list .list dt {
    flex-shrink: 0;
    background-color: var(--color-bg-light);
    border-radius: 1rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 700;
    margin-right: 0.75rem;
    white-space: nowrap;
    width: 7rem;
    text-align: center;
}
.logo_info_list .list dd {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}
.benefits_grid {
    border-top: 1px solid var(--color-border);
    margin: 3rem 6rem;
}
.benefits_grid ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    border-bottom: 1px solid var(--color-border);
}
.benefits_grid li {
    padding: 4rem;
    text-align: center;
}

.benefits_grid li:nth-child(odd) {
    border-right: 1px solid var(--color-border);
}
.benefits_grid li:nth-child(1),
.benefits_grid li:nth-child(2) {
    border-bottom: 1px solid var(--color-border);
}
.benefits_grid h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}
.benefits_grid p {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: 1rem;
    box-sizing: border-box; 
}
.modal-overlay[hidden] {
    display: none;
}

.modal_content {
    background-color: var(--color-bg-white);
    border-radius: 0.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    position: relative;
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}
.modal_header {
    position: relative; 
    padding: 1.5rem 2rem;
    flex-shrink: 0; 
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
}

.modal_body {
    overflow-y: auto;
    flex-grow: 1;
    padding: 1.5rem 2rem;
}
.modal_body hr{
    border: none;
    height: 1px;
    background-color: var(--color-border);
    margin: 2em 0;
}
.modal_body .info strong{
    display: block;
}
.modal_body .info li{
    margin: 1rem 0;
}
.modal_body .info a{
    color: var(--color-primary);
}
.modal_content p {
    margin-bottom: 1rem;
}

.modal_body .qa_list {
    margin: 0;
    padding: 0;
}
.modal_content .qa_item {
    margin-bottom: 1.5rem;
}

.modal_content .qa_item dt {
    font-weight: bold;
    margin-bottom: 1rem; 
}

.modal_content .qa_answer {
    background-color: var(--color-bg-light);
    padding: 1.25rem;
    margin-bottom: 2.5rem;
    margin-left: 0;
}
.modal_content .qa_item dt strong,
.modal_content .qa_answer strong {
    font-weight: 700; 
    margin-right: 0.25em;
}

.modal_close {
    position: absolute;
    top: 50%; 
    right: 1.5rem; 
    transform: translateY(-50%); 
    background: none;
    border: none;
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    padding: 0.5rem;
}
.modal_content .map {
    width: 100%;
    margin-top: 1.5rem;
    border: 1px solid var(--color-border);
    border-radius: 0.25rem;
    overflow: hidden; 
}

.modal_content .map iframe {
    width: 100%;
    height: 350px; 
    border: 0;
    vertical-align: top; 
}


.modal_content .info span.red{
    color: #CC0000;
    font-size: 0.9rem;
    
}

.footer {
    padding: 40px 0;
    text-align: center;
    font-size: 0.9rem;
}
.footer_nav ul, .footer_info ul{
    display: flex;
    gap: 1rem;
    justify-content: center;
}
.footer_nav a{
    text-decoration: underline;
}
.footer_info {
    font-size: 0.9rem;
    line-height: 1.8;
}
.footer_info p{
    font-weight: 900;
}
.footer_info button {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    cursor: pointer;
    color: var(--color-primary);
    text-underline-offset: 3px;
}

.footer_info button:hover {
    text-decoration: underline;
    color: var(--color-primary-dark);
}


@media screen and (max-width: 76em) {
    .header{
        padding: 2rem 0;
    }
    .header_title h1{
        font-size: 3rem;
        margin: 2rem;
    }
    .header_title .subtitle {
        display: inline-block;
    }
    .header_logo span img{
        width: 13rem;
    }
    .header_title img{
        width: 9rem;
    }
    .bg-watermark-wrapper span {
        font-size: 5rem;
    }
    .btn{
        width: 10rem;
        gap: 0.5rem;
        font-size: 0.9rem;
        margin-right: 0.7rem;   
    }
    .nav ul{
        width: 100%;
        gap: 1rem;
    }
    .nav a{
        font-size: 1rem;
    }
    .section{
        padding: 4rem 0;
    }
    .intro_title {
        font-size: 1.5rem;
    }
    .container .intro_txt {
        margin-top: 1rem;
    }

    .list_c {
        align-items: center;
    }
    .list_c02 li{
        align-items: flex-start;
        margin: 0.7rem 0 0;
        line-height: 1.3;   
    }
    .list_c li:nth-child(2) .txt {
        width: 170px;
    }
    .list_c li:nth-child(3) .txt {
        width: 210px;
    }
    .intro_box{
        padding: 2rem
    }
    .intro_box .txt, .intro_box .list {
        font-size: 0.95rem;
    }
    .intro_box .list > li {
        margin-bottom: 0.5rem;
        line-height: 1.6;
    }
    .icon-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .icon_item img{
        width: 6rem;
    }
    .stepper-list {
        flex-wrap: wrap;
        gap: 1rem 0;
    }
    .stepper-item {
        width: auto;
        max-width: none;
    }
    .stepper-item::after {
        content: '>';
        margin: 0 1rem;
        transform: none;
        position: static;
    }
    .stepper-content{
        padding: 0.5rem 1.3rem;
        min-height: auto;
        font-size: 0.9rem;
    }
    .stepper-list {
        gap: 0.8rem 0;
    }
    .stepper-item:last-child::after {
        display: none;
    }
    .stepper-item .fill span{
        font-size: 0.7rem;
    }

    .benefit_box, .benefit_box_blue {
        padding: 0 0 1.5rem 0;
    }
    .benefits_grid {
        margin: 3rem;
    }
    .benefits_grid li {    
        padding: 2rem;
    }
    .benefits_grid h3{
        font-size: 1.15rem;
        margin-bottom: 0.3rem;
    }
    .benefits_grid p {
        line-height: 1.5;
    }
    .footer_nav ul{
        flex-direction: column;
        gap: unset;
    }
    .footer_info ul{
        margin: 1.5rem;
    }

}

@media screen and (max-width: 47.2em){
    .header_title h1 {
        font-size: 2.5rem;
    }
    .nav ul {
        grid-template-columns: repeat(2, 1fr);
        gap: 0rem;
    }
    .icon-grid {
        grid-template-columns: repeat(1, 1fr);
    }
    .list_c, .list_c02{
        width: 100%;
    }
    .benefits_grid ul {
        grid-template-columns: repeat(1, 1fr);
        border-bottom: none;
    }
    .benefits_grid li{
        padding: 2rem 0;
        text-align: left;
        border-top: 1px solid var(--color-border);
    }
    .benefits_grid li:nth-child(odd) {
        border-right: none;
    }
    .benefits_grid li:nth-child(1), .benefits_grid li:nth-child(2) {
        border-bottom: none;
    }
    .logo_info_list .list {
        align-items: baseline;
    }
    .logo_info_list .list dd span{
        display: block;
    }
    .box_title {
        margin: 1.5em 0 0.8rem 0;
    }
    .box_list {
        text-align: left;
        padding: 0 2rem;
        font-size: 0.95rem;
    }
    .box_list li {
        line-height: 1.5;
        margin-bottom: 1rem;
    }
    .benefits_grid {
        border-top: none;
        padding: 0 2rem;
        margin: 0;
    }
    .card_grid{
        grid-template-columns: repeat(1, 1fr);
        margin: 2.5rem 2.5rem;
    }
    .logo_info_list {
        padding: 0 2rem;
        width: 100%;
        align-items: flex-start;
         margin: 2rem auto;
    }
    .footer_info p span{
        display: block;
    }

}