/* Commercial shell — deliberately scoped to Equation services. */
.product-ui-site {
    --service-action: #2563d8;
    --service-action-hover: #174eb6;
    --service-action-soft: #f4f8ff;
    --service-action-border: #bfd1ec;
    --service-action-shadow: rgba(37, 99, 216, 0.22);
    background: #fff;
    color: var(--ui-ink);
}

body.english-site {
    --service-action: #b94b40;
    --service-action-hover: #91372f;
    --service-action-soft: #fff5f2;
    --service-action-border: #e8bbb3;
    --service-action-shadow: rgba(185, 75, 64, 0.2);
}

.product-ui-site .site-header {
    border-bottom: 1px solid rgba(216, 224, 235, 0.86);
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 1px 0 rgba(16, 24, 40, 0.02), 0 10px 28px rgba(16, 36, 72, 0.035);
    backdrop-filter: saturate(1.35) blur(16px);
    -webkit-backdrop-filter: saturate(1.35) blur(16px);
}

.product-ui-site .header-inner {
    width: min(var(--ui-content-wide), calc(100% - 40px));
    max-width: none;
    height: 72px;
    min-height: 72px;
    padding: 0;
    column-gap: clamp(20px, 2.2vw, 42px);
}

.product-ui-site .kor-logo {
    flex: 0 0 auto;
    width: auto;
    min-width: 0;
    padding-right: 2px;
}

.product-ui-site .kor-header-wordmark {
    gap: 7px;
}

.product-ui-site .kor-header-mark {
    width: 34px;
    height: 27px;
    flex-basis: 34px;
    filter: drop-shadow(0 5px 10px rgba(37, 99, 216, 0.13));
}

.product-ui-site .kor-header-mark.eng-header-mark {
    filter: drop-shadow(0 3px 5px rgba(92, 39, 20, 0.14));
}

.product-ui-site .kor-header-text span:first-child,
.product-ui-site .kor-header-text span:last-child {
    font-size: 23px;
    font-weight: 900;
    letter-spacing: -0.055em;
}

.product-ui-site .main-nav {
    flex: 1 1 auto;
}

.mobile-nav-toggle {
    display: none;
}

.product-ui-site .gnb {
    justify-content: flex-start;
    gap: clamp(17px, 1.45vw, 27px);
}

.product-ui-site .gnb > li > a {
    position: relative;
    height: 72px;
    min-height: 72px;
    color: #39485c;
    font-size: 14px;
    font-weight: 760;
    letter-spacing: -0.02em;
    transition: color var(--ui-transition);
}

.product-ui-site .gnb > li > a::before {
    content: "";
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 2px;
    border-radius: 2px 2px 0 0;
    background: var(--ui-brand-600);
    opacity: 0;
    transform: scaleX(0.55);
    transition: opacity var(--ui-transition), transform var(--ui-transition);
}

.product-ui-site .gnb > li > a:hover,
.product-ui-site .gnb > li:focus-within > a {
    color: var(--ui-brand-800);
}

.product-ui-site .gnb > li > a:hover::before,
.product-ui-site .gnb > li:focus-within > a::before {
    opacity: 1;
    transform: scaleX(1);
}

/* Independent subject sites separate catalog navigation from service utilities. */
@media (min-width: 641px) {
    .product-ui-site .independent-nav .gnb {
        gap: 0;
    }

    .product-ui-site .independent-nav .nav-catalog-item > a,
    .product-ui-site .independent-nav .nav-service-item > a {
        min-height: 40px;
        height: 40px;
        padding: 0 11px;
    }

    .product-ui-site .independent-nav .nav-catalog-item > a {
        border-top: 1px solid #e1e7ef;
        border-bottom: 1px solid #e1e7ef;
        background: #f4f6f9;
        color: #334155;
    }

    .product-ui-site .independent-nav .nav-catalog-first > a {
        border-left: 1px solid #e1e7ef;
        border-radius: 8px 0 0 8px;
    }

    .product-ui-site .independent-nav .nav-catalog-last > a {
        margin-right: 30px;
        border-right: 1px solid #e1e7ef;
        border-radius: 0 8px 8px 0;
    }

    .product-ui-site .independent-nav .nav-service-item > a {
        border-top: 1px solid #cddcf4;
        border-bottom: 1px solid #cddcf4;
        background: var(--ui-brand-50);
        color: var(--ui-brand-800);
    }

    .product-ui-site .independent-nav .nav-service-first > a {
        border-left: 1px solid #cddcf4;
        border-radius: 8px 0 0 8px;
    }

    .product-ui-site .independent-nav .nav-service-last > a {
        border-right: 1px solid #cddcf4;
        border-radius: 0 8px 8px 0;
    }

    .product-ui-site .independent-nav .nav-service-single > a {
        border: 1px solid #cddcf4;
        border-radius: 9px;
    }

    body.english-site .independent-nav .nav-service-item > a {
        border-color: #edc8c0;
        background: #fff5f2;
        color: #963c34;
    }
}

/* Free resource library is a destination of its own, not a customer-center utility. */
.product-ui-site .gnb > .nav-free-library {
    margin-left: 2px;
    margin-right: 6px;
}

.product-ui-site .gnb > .nav-free-library > .nav-free-library-link {
    gap: 7px;
    min-height: 42px;
    height: 42px;
    padding: 0 11px;
    border: 1px solid #9bd8bd;
    border-radius: 10px;
    background: linear-gradient(135deg, #f0fdf7 0%, #e7f9f0 100%);
    color: #087a55;
    box-shadow: 0 7px 18px rgba(8, 122, 85, 0.11);
}

.product-ui-site .gnb > .nav-free-library > .nav-free-library-link::before {
    display: none;
}

.product-ui-site .gnb > .nav-free-library > .nav-free-library-link:hover,
.product-ui-site .gnb > .nav-free-library:focus-within > .nav-free-library-link {
    border-color: #5fc79b;
    background: linear-gradient(135deg, #e8fbf2 0%, #d9f5e8 100%);
    color: #05603f;
    box-shadow: 0 9px 22px rgba(8, 122, 85, 0.17);
    transform: translateY(-1px);
}

.product-ui-site .nav-free-library-icon,
.product-ui-site .nav-customer-center-icon {
    width: 18px;
    height: 18px;
    flex: 0 0 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.product-ui-site .nav-customer-center-link {
    gap: 7px;
}

body.english-site .gnb > .nav-free-library > .nav-free-library-link {
    border-color: #e2b6a6;
    background: linear-gradient(135deg, #fff8f3 0%, #fff0e8 100%);
    color: #9a3e32;
    box-shadow: 0 7px 18px rgba(154, 62, 50, 0.1);
}

.product-ui-site .submenu,
.product-ui-site .kor-submenu {
    top: calc(100% - 7px);
    min-width: 210px;
    padding: 9px;
    border: 1px solid var(--ui-border-soft);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.985);
    box-shadow: var(--ui-shadow-md);
}

.product-ui-site .catalog-nav-dropdown {
    width: 240px;
    max-width: calc(100vw - 32px);
    max-height: min(70vh, 620px);
    overflow-x: hidden;
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
}

.product-ui-site .catalog-nav-dropdown li a {
    white-space: normal;
    overflow-wrap: anywhere;
}

.product-ui-site .gnb > li.mobile-submenu-open > .submenu,
.product-ui-site .gnb > li.mobile-submenu-open > .kor-submenu {
    display: block;
}

.product-ui-site .submenu li a,
.product-ui-site .kor-submenu li a {
    min-height: 38px;
    padding: 9px 11px;
    border-radius: 9px;
    color: #344054;
    font-size: 13px;
    font-weight: 700;
}

.product-ui-site .submenu li a:hover,
.product-ui-site .kor-submenu li a:hover {
    background: var(--ui-brand-50);
    color: var(--ui-brand-800);
}

/* Make the catalog hierarchy legible at a glance. */
.product-ui-site .kor-submenu .kor-submenu-parent > a,
.product-ui-site .kor-board-side .kor-side-list > .has-children > a {
    position: relative;
    margin: 10px 2px 4px;
    padding: 9px 11px 9px 15px;
    border: 1px solid var(--ui-border);
    border-left: 4px solid var(--ui-brand-600);
    border-radius: 7px;
    background: var(--ui-brand-50);
    color: var(--ui-brand-900);
    font-size: 13px;
    font-weight: 900;
    line-height: 1.35;
}

.product-ui-site .kor-submenu .kor-submenu-parent:first-child > a {
    margin-top: 2px;
}

.product-ui-site .kor-submenu .kor-submenu-topic,
.product-ui-site .kor-submenu .kor-submenu-child {
    position: relative;
}

.product-ui-site .kor-submenu .kor-submenu-topic:not(.kor-submenu-parent)::before {
    content: "";
    position: absolute;
    z-index: 1;
    top: 0;
    bottom: 0;
    left: 15px;
    border-left: 1px solid var(--ui-border);
    pointer-events: none;
}

/* Hard stop every catalog branch at its final visible node. */
.product-ui-site .kor-submenu .kor-submenu-topic.kor-submenu-end::before,
.product-ui-site .kor-submenu .kor-submenu-topic:last-child::before {
    bottom: 50%;
}

.product-ui-site .kor-submenu .kor-submenu-topic:not(.kor-submenu-parent) > a {
    position: relative;
    z-index: 2;
    margin-left: 8px;
    padding-left: 25px;
}

.product-ui-site .kor-submenu .kor-submenu-topic:not(.kor-submenu-parent) > a::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 7px;
    width: 9px;
    border-top: 1px solid var(--ui-border);
}

.product-ui-site .kor-submenu .kor-submenu-children {
    position: relative;
    margin: 0 2px 5px 31px;
    padding: 0 0 0 15px;
    list-style: none;
}

.product-ui-site .kor-submenu .kor-submenu-children::before {
    content: "";
    position: absolute;
    top: -4px;
    bottom: 19px;
    left: 0;
    border-left: 1px solid var(--ui-border);
    pointer-events: none;
}

.product-ui-site .kor-submenu .kor-submenu-child::before {
    content: "";
    position: absolute;
    top: 50%;
    left: -15px;
    width: 15px;
    border-top: 1px solid var(--ui-border);
    pointer-events: none;
}

.product-ui-site .kor-submenu .kor-submenu-child > a {
    position: relative;
    z-index: 2;
    margin-left: 0;
    padding-left: 13px;
    background: transparent;
    font-size: 12px;
}

@media (min-width: 1081px) {
    .product-ui-site .kor-board-side .kor-side-block {
        padding: 14px 10px 16px;
    }

    .product-ui-site .kor-board-side .kor-side-head {
        margin: 0 0 7px;
        padding: 9px 11px;
        border-left: 4px solid var(--ui-brand-600);
        border-radius: 7px;
        background: var(--ui-brand-50);
        color: var(--ui-brand-900);
        font-size: 13px;
        font-weight: 900;
        line-height: 1.4;
    }

    .product-ui-site .kor-board-side .kor-side-list {
        position: relative;
        margin-left: 13px;
        padding-left: 10px;
        border-left: 1px solid var(--ui-border);
    }

    .product-ui-site .kor-board-side .kor-side-list > li {
        position: relative;
    }

    .product-ui-site .kor-board-side .kor-side-list > li::before {
        content: "";
        position: absolute;
        top: 21px;
        left: -10px;
        width: 10px;
        border-top: 1px solid var(--ui-border);
    }

    /* End the vertical branch at the final node instead of leaving a tail. */
    .product-ui-site .kor-board-side .kor-side-list > li:last-child::after {
        content: "";
        position: absolute;
        z-index: 1;
        top: 22px;
        bottom: -1px;
        left: -11px;
        width: 2px;
        background: var(--ui-surface);
        pointer-events: none;
    }

    .product-ui-site .kor-board-side .kor-side-list > .kor-side-topic:not(.has-children) > a {
        padding-left: 14px;
    }

    .product-ui-site .kor-board-side .kor-side-list > .has-children > a {
        margin-left: -1px;
        border-left-color: #d97745;
    }

    .product-ui-site .kor-board-side .kor-side-list > .has-children > a.is-current::before {
        content: none;
    }

    .product-ui-site .kor-board-side .kor-side-children {
        position: relative;
        margin: 0 0 4px 18px;
        padding: 0 0 0 12px;
        border-left: 1px solid var(--ui-border);
        list-style: none;
    }

    .product-ui-site .kor-board-side .kor-side-children > li {
        position: relative;
    }

    .product-ui-site .kor-board-side .kor-side-children > li::before {
        content: "";
        position: absolute;
        top: 20px;
        left: -12px;
        width: 12px;
        border-top: 1px solid var(--ui-border);
    }

    .product-ui-site .kor-board-side .kor-side-children > li:last-child::after {
        content: "";
        position: absolute;
        z-index: 1;
        top: 21px;
        bottom: -1px;
        left: -13px;
        width: 2px;
        background: var(--ui-surface);
        pointer-events: none;
    }

    .product-ui-site .kor-board-side .kor-side-children > li > a {
        position: relative;
        z-index: 2;
        margin-left: 2px;
        padding-left: 16px;
        font-size: 13px;
    }
}

body.english-site .kor-submenu .kor-submenu-parent > a,
body.english-site .kor-board-side .kor-side-list > .has-children > a,
body.english-site .kor-board-side .kor-side-head {
    border-left-color: #c85f52;
    background: #fff3ef;
    color: #8f352e;
}

body.english-site .kor-board-side .kor-side-list a.is-current {
    background: #fff0ec;
    color: #963c34;
}

/* Shared action controls: consistent hierarchy across both Equation services. */
.product-ui-site :where(
    .kor-btn-primary,
    .kor-btn-search,
    .kor-btn-upload,
    .kor-empty-action,
    .kor-selected-btn,
    .kor-upload-primary,
    .kor-upload-secondary,
    .kor-purchase-confirm,
    .kor-purchase-cancel,
    .kor-login-submit
) {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 18px;
    border-radius: 8px;
    font: inherit;
    font-size: 14px;
    font-weight: 850;
    line-height: 1;
    letter-spacing: 0;
    text-decoration: none;
    cursor: pointer;
    transition: border-color 0.16s ease, background-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.product-ui-site :where(
    .kor-btn-primary,
    .kor-btn-search,
    .kor-btn-upload,
    .kor-empty-action,
    .kor-selected-btn.is-primary,
    .kor-upload-primary,
    .kor-purchase-confirm,
    .kor-login-submit
) {
    border: 1px solid var(--service-action);
    background: var(--service-action);
    color: #fff;
    box-shadow: 0 7px 16px var(--service-action-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.product-ui-site :where(
    .kor-btn-ghost,
    .kor-btn-reset,
    .kor-selected-btn.is-secondary,
    .kor-upload-secondary,
    .kor-purchase-cancel
) {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 15px;
    border: 1px solid var(--service-action-border);
    border-radius: 8px;
    background: #fff;
    color: var(--service-action-hover);
    font: inherit;
    font-size: 14px;
    font-weight: 800;
    line-height: 1;
    letter-spacing: 0;
    text-decoration: none;
    box-shadow: 0 3px 9px rgba(16, 36, 72, 0.06);
    cursor: pointer;
    transition: border-color 0.16s ease, background-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.product-ui-site :where(
    .kor-btn-primary,
    .kor-btn-search,
    .kor-btn-upload,
    .kor-empty-action,
    .kor-selected-btn.is-primary,
    .kor-upload-primary,
    .kor-purchase-confirm,
    .kor-login-submit
):hover {
    border-color: var(--service-action-hover);
    background: var(--service-action-hover);
    box-shadow: 0 10px 22px var(--service-action-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.product-ui-site :where(
    .kor-btn-ghost,
    .kor-btn-reset,
    .kor-selected-btn.is-secondary,
    .kor-upload-secondary,
    .kor-purchase-cancel
):hover {
    border-color: var(--service-action);
    background: var(--service-action-soft);
    color: var(--service-action-hover);
    box-shadow: 0 7px 16px var(--service-action-shadow);
    transform: translateY(-1px);
}

.product-ui-site :where(
    .kor-btn-primary,
    .kor-btn-search,
    .kor-btn-upload,
    .kor-empty-action,
    .kor-selected-btn,
    .kor-btn-ghost,
    .kor-btn-reset,
    .kor-upload-primary,
    .kor-upload-secondary,
    .kor-purchase-confirm,
    .kor-purchase-cancel,
    .kor-login-submit
):active {
    box-shadow: none;
    transform: translateY(0);
}

.product-ui-site :where(
    .kor-btn-primary,
    .kor-btn-search,
    .kor-btn-upload,
    .kor-empty-action,
    .kor-selected-btn,
    .kor-btn-ghost,
    .kor-btn-reset,
    .kor-upload-primary,
    .kor-upload-secondary,
    .kor-purchase-confirm,
    .kor-purchase-cancel,
    .kor-login-submit
):focus-visible {
    outline: 3px solid color-mix(in srgb, var(--service-action) 28%, transparent);
    outline-offset: 2px;
}

.product-ui-site :where(button, [role="button"], a)[disabled],
.product-ui-site :where(button, [role="button"], a)[aria-disabled="true"] {
    border-color: #d8dee8;
    background: #eef1f5;
    color: #98a2b3;
    box-shadow: none;
    cursor: not-allowed;
    opacity: 1;
    pointer-events: none;
    transform: none;
}

.product-ui-site .kor-filter-search .kor-btn-search {
    min-height: 38px;
    padding: 0 18px;
    border-radius: 7px;
    box-shadow: 0 4px 10px var(--service-action-shadow);
}

.product-ui-site .kor-tools-right .kor-btn-reset {
    min-width: 72px;
}

.product-ui-site .auth-area {
    flex: 0 0 auto;
    gap: 7px;
    color: var(--ui-ink-strong);
    font-size: 13px;
}

.product-ui-site .mobile-account-panel {
    display: none;
}

.product-ui-site .header-logout-form,
.product-ui-site .account-dropdown-logout-form {
    margin: 0;
}

.product-ui-site .header-logout-form {
    display: flex;
}

.product-ui-site .account-dropdown-logout-form button {
    width: 100%;
    min-height: 40px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 14px;
    border: 0;
    border-top: 1px solid #eef2f7;
    background: #fff;
    color: #e03131;
    font: inherit;
    font-weight: 800;
    text-align: left;
    cursor: pointer;
}

.product-ui-site .account-dropdown-logout-form button:hover {
    background: #fff5f5;
}

.product-ui-site .login-btn,
.product-ui-site .logout-btn {
    min-height: 38px;
    padding: 0 12px;
    border: 0;
    border-radius: 10px;
    background: transparent;
    color: #475467;
    font-size: 13px;
    font-weight: 800;
}

.product-ui-site .login-btn:hover,
.product-ui-site .logout-btn:hover {
    background: var(--ui-surface-soft);
    color: var(--ui-brand-800);
}

.product-ui-site .signup-link-btn {
    border: 1px solid var(--ui-border);
    background: #fff;
    color: var(--ui-ink-strong);
    box-shadow: var(--ui-shadow-xs);
}

.product-ui-site .signup-link-btn::before,
.product-ui-site .logout-btn::before {
    content: none;
}

.product-ui-site .header-balance-group {
    gap: 0;
    min-height: 38px;
    overflow: hidden;
    border: 1px solid var(--ui-border);
    border-radius: 11px;
    background: var(--ui-surface-soft);
    box-shadow: var(--ui-shadow-xs);
}

.product-ui-site .header-saved-cart {
    position: relative;
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    width: auto;
    min-width: 104px;
    height: 38px;
    gap: 7px;
    padding: 0 15px 0 12px;
    border: 1px solid #1d4ed8;
    border-radius: 11px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 55%, #173ea5 100%);
    color: #fff;
    box-shadow: 0 9px 22px rgba(29, 78, 216, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.22);
    transition: border-color var(--ui-transition), box-shadow var(--ui-transition), transform var(--ui-transition), filter var(--ui-transition);
}

.product-ui-site .header-saved-cart svg {
    width: 21px;
    height: 21px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.1;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.product-ui-site .header-saved-cart:hover {
    border-color: #1e40af;
    color: #fff;
    filter: brightness(1.08);
    box-shadow: 0 12px 28px rgba(29, 78, 216, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.product-ui-site .header-saved-cart-label {
    color: #fff;
    font-size: 12px;
    font-weight: 900;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.product-ui-site .header-saved-cart-count {
    position: absolute;
    top: -8px;
    right: -8px;
    display: grid;
    place-items: center;
    min-width: 21px;
    height: 21px;
    padding: 0 5px;
    border: 2px solid #fff;
    border-radius: 999px;
    background: #ff2d55;
    color: #fff;
    font-size: 11px;
    font-weight: 900;
    line-height: 1;
    box-shadow: 0 4px 10px rgba(255, 45, 85, 0.42);
}

@media (max-width: 860px) {
    .product-ui-site .header-saved-cart {
        min-width: 32px;
        width: 32px;
        height: 30px;
        gap: 0;
        padding: 0;
        border-radius: 9px;
    }

    .product-ui-site .header-saved-cart svg {
        width: 18px;
        height: 18px;
    }

    .product-ui-site .header-saved-cart-count {
        top: -6px;
        right: -5px;
    }

    .product-ui-site .header-saved-cart-label {
        display: none;
    }
}

.product-ui-site .header-cash-balance,
.product-ui-site .header-bonus-balance {
    min-height: 36px;
    padding: 0 11px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: #344054;
    font-size: 12px;
    font-weight: 850;
    box-shadow: none;
}

.product-ui-site .header-cash-balance {
    position: relative;
    cursor: pointer;
    text-decoration: none;
    transition: background-color var(--ui-transition), color var(--ui-transition);
}

.product-ui-site .header-cash-balance::after {
    content: "충전";
    margin-left: 6px;
    padding: 2px 5px;
    border-radius: 4px;
    background: #dbeafe;
    color: #1d4ed8;
    font-size: 9px;
    font-weight: 900;
    line-height: 1.2;
}

.product-ui-site .header-cash-balance:hover,
.product-ui-site .header-cash-balance:focus-visible {
    background: var(--ui-brand-50);
    color: var(--ui-brand-800);
    outline: none;
}

.product-ui-site .header-bonus-balance {
    position: relative;
    color: var(--ui-brand-800);
}

.product-ui-site .header-bonus-balance::before {
    content: "";
    position: absolute;
    top: 9px;
    bottom: 9px;
    left: 0;
    width: 1px;
    background: var(--ui-border);
}

.product-ui-site .header-bonus-balance:hover {
    background: var(--ui-brand-50);
    transform: none;
}

.product-ui-site .header-balance-plus {
    display: none;
}

.product-ui-site .header-payment-btn {
    min-height: 38px;
    padding: 0 14px;
    border: 1px solid var(--ui-brand-600);
    border-radius: 10px;
    background: var(--ui-brand-600);
    color: #fff;
    font-size: 12px;
    font-weight: 850;
    box-shadow: 0 7px 16px rgba(37, 99, 216, 0.18);
    transition: background-color var(--ui-transition), border-color var(--ui-transition), box-shadow var(--ui-transition), transform var(--ui-transition);
}

.product-ui-site .header-payment-btn:hover {
    border-color: var(--ui-brand-800);
    background: var(--ui-brand-800);
    box-shadow: 0 10px 20px rgba(37, 99, 216, 0.23);
    transform: translateY(-1px);
}

.product-ui-site .auth-area .my-class.active {
    min-height: 38px;
    height: 38px;
    padding: 0 12px;
    border: 1px solid var(--ui-border);
    border-radius: 10px;
    background: #fff;
    color: #344054;
    font-size: 12px;
    font-weight: 800;
    box-shadow: var(--ui-shadow-xs);
}

.product-ui-site .auth-area .my-class.active:hover {
    border-color: #bfd1ec;
    background: var(--ui-brand-50);
    color: var(--ui-brand-800);
    box-shadow: none;
}

.product-ui-site .account-dropdown {
    height: 38px;
}

.product-ui-site .account-dropdown-menu {
    top: calc(100% + 9px);
    padding: 8px;
    border: 1px solid var(--ui-border-soft);
    border-radius: 14px;
    box-shadow: var(--ui-shadow-md);
}

.product-ui-site .account-dropdown-menu a {
    border-radius: 9px;
}

.product-ui-site .site-footer {
    margin-top: 96px;
    border-top: 1px solid var(--ui-border-soft);
    background: #f7f9fc;
    color: var(--ui-ink);
}

.product-ui-site .footer-inner {
    width: min(var(--ui-content), calc(100% - 48px));
    max-width: none;
    padding: 52px 0 46px;
}

.product-ui-site .footer-bottom-layout {
    grid-template-columns: minmax(0, 1fr) 180px auto;
    gap: 48px;
}

.product-ui-site .footer-info strong,
.product-ui-site .footer-link-group h2 {
    color: var(--ui-ink-strong);
}

.product-ui-site .footer-info p {
    max-width: 820px;
    color: var(--ui-ink-muted);
    line-height: 1.8;
}

.product-ui-site .footer-policy {
    gap: 0;
}

.product-ui-site .footer-policy a {
    position: relative;
    padding-right: 16px;
    margin-right: 16px;
    color: #475467;
    font-size: 13px;
    font-weight: 750;
}

.product-ui-site .footer-policy a:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: 0;
    width: 1px;
    height: 11px;
    background: #d0d7e2;
    transform: translateY(-50%);
}

.product-ui-site .footer-copy {
    color: var(--ui-ink-subtle);
    font-size: 12px;
}

.product-ui-site .notice-bg {
    background: rgba(11, 31, 69, 0.48);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
}

.product-ui-site .notice-box {
    width: min(460px, calc(100vw - 32px));
    padding: 28px;
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 20px;
    box-shadow: 0 28px 80px rgba(11, 31, 69, 0.26);
}

.product-ui-site .notice-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 12px;
    color: var(--ui-ink-strong);
    font-size: 22px;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.product-ui-site .notice-title-icon {
    position: relative;
    display: inline-block;
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: var(--ui-brand-100);
}

.product-ui-site .notice-title-icon::before {
    content: "";
    position: absolute;
    inset: 8px;
    background: var(--ui-brand-700);
    -webkit-mask: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M4 11v2a2 2 0 0 0 2 2h2l1 4h3l-1-4 8-3V6L8 9H6a2 2 0 0 0-2 2ZM19 9v0' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
    mask: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M4 11v2a2 2 0 0 0 2 2h2l1 4h3l-1-4 8-3V6L8 9H6a2 2 0 0 0-2 2ZM19 9v0' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
}

.product-ui-site .notice-content {
    margin-bottom: 24px;
    color: #475467;
    font-size: 14px;
    line-height: 1.75;
}

.product-ui-site .notice-footer label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--ui-ink-muted);
    font-size: 13px;
    font-weight: 700;
}

.product-ui-site .notice-footer input {
    width: 17px;
    height: 17px;
    accent-color: var(--ui-brand-600);
}

.product-ui-site .notice-buttons button {
    width: 40px;
    height: 40px;
    border: 1px solid var(--ui-border-soft);
    background: var(--ui-surface-soft);
    color: var(--ui-ink-muted);
    font-size: 22px;
    transition: background-color var(--ui-transition), color var(--ui-transition), transform var(--ui-transition);
}

.product-ui-site .notice-buttons button:hover {
    background: var(--ui-brand-50);
    color: var(--ui-brand-700);
    transform: rotate(4deg);
}

@media (max-width: 1260px) {
    .product-ui-site .header-inner {
        width: min(100% - 32px, var(--ui-content-wide));
        column-gap: 22px;
    }

    .product-ui-site .gnb {
        gap: 18px;
    }

    .product-ui-site .header-balance-group {
        display: none;
    }
}

@media (min-width: 641px) and (max-width: 1440px) {
    .product-ui-site .gnb > li:first-child > .submenu,
    .product-ui-site .gnb > li:first-child > .kor-submenu {
        left: 0;
        transform: none;
    }
}

@media (max-width: 1440px) {
    .product-ui-site .header-inner {
        height: auto;
        min-height: 144px;
        grid-template-columns: auto 1fr;
        grid-template-rows: 68px auto;
        justify-items: stretch;
        padding: 12px 0 18px;
        gap: 6px 18px;
    }

    .product-ui-site .kor-logo {
        grid-column: 1;
        grid-row: 1;
        align-self: center;
    }

    .product-ui-site .auth-area {
        grid-column: 2;
        grid-row: 1;
        min-width: 0;
        align-self: center;
        justify-content: flex-end;
    }

    .product-ui-site .main-nav {
        grid-column: 1 / -1;
        grid-row: 2;
        min-width: 0;
        align-self: center;
        overflow-x: auto;
        overscroll-behavior-inline: contain;
        scrollbar-width: none;
    }

    .product-ui-site .main-nav::-webkit-scrollbar {
        display: none;
    }

    .product-ui-site .gnb {
        width: max-content;
        justify-content: flex-start;
        flex-wrap: nowrap;
        gap: 20px;
        padding: 0 2px;
    }

    .product-ui-site .gnb > li > a {
        min-height: 46px;
        height: 46px;
        font-size: 13px;
    }
}

@media (min-width: 760px) and (max-width: 1440px) {
    .product-ui-site .header-balance-group {
        display: flex;
    }
}

@media (min-width: 641px) and (max-width: 1440px) {
    .product-ui-site .main-nav {
        overflow: visible;
    }
}

@media (max-width: 640px) {
    .product-ui-site .header-inner {
        width: calc(100% - 28px);
        height: 64px;
        min-height: 64px;
        grid-template-columns: 1fr auto auto;
        grid-template-rows: 56px;
        padding: 4px 0;
        gap: 0 10px;
        position: relative;
    }

    .product-ui-site .kor-header-mark {
        width: 29px;
        height: 23px;
        flex-basis: 29px;
    }

    .product-ui-site .kor-header-text span:first-child,
    .product-ui-site .kor-header-text span:last-child {
        font-size: 20px;
    }

    .product-ui-site .auth-area {
        grid-column: 2;
        grid-row: 1;
        gap: 3px;
    }

    .product-ui-site .mobile-nav-toggle {
        grid-column: 3;
        grid-row: 1;
        display: inline-flex;
        width: 38px;
        height: 38px;
        align-self: center;
        align-items: center;
        justify-content: center;
        padding: 0;
        border: 1px solid var(--ui-border);
        border-radius: 10px;
        background: #fff;
        color: var(--ui-ink-strong);
        box-shadow: var(--ui-shadow-xs);
        cursor: pointer;
    }

    .product-ui-site .mobile-nav-toggle-lines {
        display: grid;
        width: 17px;
        gap: 4px;
    }

    .product-ui-site .mobile-nav-toggle-lines i {
        display: block;
        width: 100%;
        height: 1.5px;
        border-radius: 999px;
        background: currentColor;
        transform-origin: center;
        transition: opacity var(--ui-transition), transform var(--ui-transition);
    }

    .product-ui-site .mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-lines i:nth-child(1) {
        transform: translateY(5.5px) rotate(45deg);
    }

    .product-ui-site .mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-lines i:nth-child(2) {
        opacity: 0;
    }

    .product-ui-site .mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle-lines i:nth-child(3) {
        transform: translateY(-5.5px) rotate(-45deg);
    }

    .product-ui-site .login-btn,
    .product-ui-site .signup-link-btn {
        min-height: 34px;
        padding: 0 7px;
        font-size: 12px;
    }

    .product-ui-site .auth-area .classroom-btn,
    .product-ui-site .header-payment-btn {
        display: none;
    }

    .product-ui-site .auth-area .my-class.active {
        min-height: 34px;
        height: 34px;
        padding: 0 9px;
    }

    .product-ui-site .main-nav {
        position: absolute;
        top: calc(100% + 1px);
        right: -14px;
        left: -14px;
        z-index: 1250;
        display: none;
        width: auto;
        height: auto;
        min-height: 0;
        max-height: calc(100vh - 72px);
        overflow-y: auto;
        padding: 12px 14px 18px;
        border-top: 1px solid var(--ui-border-soft);
        border-bottom: 1px solid var(--ui-border);
        background: rgba(255, 255, 255, 0.985);
        box-shadow: 0 22px 38px rgba(16, 36, 72, 0.14);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
    }

    .product-ui-site .main-nav.is-open {
        display: block;
    }

    .product-ui-site .gnb {
        display: grid;
        grid-template-columns: minmax(0, 1fr);
        width: 100%;
        height: auto;
        align-items: stretch;
        justify-items: stretch;
        gap: 2px;
        padding: 0;
    }

    .product-ui-site .gnb > li {
        display: block;
        width: 100%;
        height: auto;
    }

    .product-ui-site .gnb > li > a {
        width: 100%;
        max-width: none;
        min-height: 46px;
        height: 46px;
        justify-content: flex-start;
        padding: 0 12px;
        border-radius: 10px;
        color: var(--ui-ink-strong);
        font-size: 14px;
        font-weight: 800;
    }

    .product-ui-site .independent-nav .nav-catalog-item > a {
        border-radius: 0;
        background: #f4f6f9;
    }

    .product-ui-site .independent-nav .nav-catalog-first > a {
        border-radius: 8px 8px 0 0;
    }

    .product-ui-site .independent-nav .nav-catalog-last {
        margin-bottom: 12px;
    }

    .product-ui-site .independent-nav .nav-catalog-last > a {
        border-radius: 0 0 8px 8px;
    }

    .product-ui-site .independent-nav .nav-service-item > a {
        border-radius: 0;
        background: var(--ui-brand-50);
        color: var(--ui-brand-800);
    }

    .product-ui-site .independent-nav .nav-service-first > a {
        border-radius: 8px 8px 0 0;
    }

    .product-ui-site .independent-nav .nav-service-last > a {
        border-radius: 0 0 8px 8px;
    }

    body.english-site .independent-nav .nav-service-item > a,
    body.english-site .independent-nav .nav-service-item.mobile-submenu-open > a {
        background: #fff5f2;
        color: #963c34;
    }

    .product-ui-site .gnb > .nav-free-library {
        margin: 10px 0 8px;
    }

    .product-ui-site .gnb > .nav-free-library > .nav-free-library-link {
        min-height: 50px;
        height: 50px;
        padding: 0 12px;
        border-radius: 11px;
        background: linear-gradient(135deg, #f0fdf7 0%, #e7f9f0 100%);
        color: #087a55;
        box-shadow: none;
    }

    .product-ui-site .gnb > .nav-free-library.mobile-submenu-open > .nav-free-library-link {
        border-color: #5fc79b;
        background: #e3f8ed;
        color: #05603f;
        transform: none;
    }

    body.english-site .gnb > .nav-free-library > .nav-free-library-link,
    body.english-site .gnb > .nav-free-library.mobile-submenu-open > .nav-free-library-link {
        border-color: #e2b6a6;
        background: #fff4ee;
        color: #9a3e32;
    }

    .product-ui-site .gnb > li > a:hover,
    .product-ui-site .gnb > li.mobile-submenu-open > a {
        background: var(--ui-brand-50);
        color: var(--ui-brand-800);
    }

    .product-ui-site .gnb > li > a::before {
        display: none;
    }

    .product-ui-site .gnb > li.has-submenu > a::after {
        margin-left: auto;
    }

    .product-ui-site .gnb .submenu,
    .product-ui-site .gnb .kor-submenu {
        position: static;
        display: none;
        width: 100%;
        min-width: 0;
        margin: 2px 0 8px;
        padding: 7px;
        border-color: var(--ui-border-soft);
        border-radius: 11px;
        background: var(--ui-surface-soft);
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .product-ui-site .gnb .catalog-nav-dropdown {
        max-width: none;
        max-height: none;
        overflow: visible;
        scrollbar-gutter: auto;
    }

    .product-ui-site .gnb > li.mobile-submenu-open > .submenu,
    .product-ui-site .gnb > li.mobile-submenu-open > .kor-submenu {
        display: block;
    }

    .product-ui-site .gnb .kor-submenu-parent > a {
        margin: 6px 6px 3px;
        padding: 8px 10px 8px 13px;
        border-left-width: 4px;
        border-radius: 7px;
        background: var(--ui-brand-50);
        color: var(--ui-brand-900);
        font-size: 12px;
    }

    .product-ui-site .gnb .submenu li a,
    .product-ui-site .gnb .kor-submenu li a {
        min-height: 40px;
        padding: 10px;
    }

    .product-ui-site .gnb .kor-submenu .kor-submenu-topic:not(.kor-submenu-parent) > a {
        margin-left: 8px;
        padding-left: 25px;
    }

    .product-ui-site .gnb .kor-submenu .kor-submenu-child > a {
        margin-left: 0;
        padding-left: 13px;
    }

    .product-ui-site .mobile-account-panel {
        display: grid;
        gap: 12px;
        margin-top: 14px;
        padding: 16px;
        border: 1px solid #d8e3f3;
        border-radius: 16px;
        background: linear-gradient(145deg, #f7faff 0%, #eef4ff 100%);
        box-shadow: 0 10px 24px rgba(25, 65, 125, 0.1);
    }

    .product-ui-site .mobile-account-profile {
        display: grid;
        grid-template-columns: 42px minmax(0, 1fr) auto;
        gap: 11px;
        align-items: center;
        min-width: 0;
        color: var(--ui-ink-strong);
        text-decoration: none;
    }

    .product-ui-site .mobile-account-avatar,
    .product-ui-site .mobile-account-photo {
        width: 42px;
        height: 42px;
        border-radius: 13px;
    }

    .product-ui-site .mobile-account-avatar {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: linear-gradient(145deg, var(--ui-brand-500), var(--ui-brand-700));
        color: #fff;
        font-size: 16px;
        font-weight: 900;
        box-shadow: 0 7px 16px rgba(37, 99, 235, 0.2);
    }

    .product-ui-site .mobile-account-photo {
        object-fit: cover;
    }

    .product-ui-site .mobile-account-profile div,
    .product-ui-site .mobile-account-guest {
        display: grid;
        gap: 3px;
        min-width: 0;
    }

    .product-ui-site .mobile-account-profile strong,
    .product-ui-site .mobile-account-guest strong {
        overflow: hidden;
        color: var(--ui-ink-strong);
        font-size: 14px;
        font-weight: 900;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .product-ui-site .mobile-account-profile div span,
    .product-ui-site .mobile-account-guest span {
        color: var(--ui-ink-muted);
        font-size: 12px;
    }

    .product-ui-site .mobile-account-chevron {
        color: var(--ui-brand-600);
        font-size: 25px;
        line-height: 1;
    }

    .product-ui-site .mobile-account-balances {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }

    .product-ui-site .mobile-account-balances > a {
        display: grid;
        gap: 6px;
        min-width: 0;
        padding: 12px;
        border: 1px solid rgba(95, 130, 185, 0.2);
        border-radius: 12px;
        background: rgba(255, 255, 255, 0.88);
        color: var(--ui-ink-strong);
        text-decoration: none;
    }

    .product-ui-site .mobile-account-balances span {
        color: var(--ui-ink-muted);
        font-size: 11px;
        font-weight: 700;
    }

    .product-ui-site .mobile-account-balances strong {
        overflow: hidden;
        color: var(--ui-brand-700);
        font-size: 17px;
        font-weight: 900;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .product-ui-site .mobile-account-balances small {
        margin-left: 2px;
        font-size: 11px;
    }

    .product-ui-site .mobile-account-actions {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }

    .product-ui-site .mobile-account-actions form {
        margin: 0;
    }

    .product-ui-site .mobile-account-actions a,
    .product-ui-site .mobile-account-actions button {
        display: inline-flex;
        width: 100%;
        min-height: 43px;
        align-items: center;
        justify-content: center;
        margin: 0;
        padding: 0 12px;
        border: 1px solid #c8d7eb;
        border-radius: 11px;
        background: #fff;
        color: var(--ui-ink-strong);
        font: inherit;
        font-size: 13px;
        font-weight: 850;
        text-decoration: none;
        cursor: pointer;
    }

    .product-ui-site .mobile-account-actions .mobile-account-primary {
        border-color: var(--ui-brand-600);
        background: linear-gradient(135deg, var(--ui-brand-500), var(--ui-brand-700));
        color: #fff;
        box-shadow: 0 7px 15px rgba(37, 99, 235, 0.2);
    }

    .product-ui-site .site-footer {
        margin-top: 64px;
    }

    .product-ui-site .footer-inner {
        width: calc(100% - 40px);
        padding: 40px 0 36px;
    }

    .product-ui-site .footer-bottom-layout {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .product-ui-site .footer-policy {
        align-items: flex-start;
        gap: 10px 0;
    }

    .product-ui-site .footer-policy a {
        padding-right: 12px;
        margin-right: 12px;
        font-size: 12px;
    }

    .product-ui-site .notice-box {
        padding: 24px 20px 20px;
        border-radius: 18px;
    }
}