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

html,
body {
    min-height: 100%;
    overflow-x: hidden;
    overflow-y: auto;
}

body {
    display: flex;
    flex-direction: column;
    background-color: #ffffff;
    font-family: 'Pretendard', 'Noto Sans KR', 'NexonLv2Gothic', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Nanum Gothic', 'Noto Sans', 'sans-serif';
    font-weight: 700;
    letter-spacing: -0.02em;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background-color: #ffffff;

    flex-shrink: 0;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

.logo img {
    height: 80px;
    width: auto;
    object-fit: contain;
    background: transparent;
    border: none;
    outline: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
    flex: 1;
    justify-content: center;
}

.nav-menu a {
    color: #000000;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    letter-spacing: -0.02em;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #ffffff;
}

.header-buttons {
    display: flex;
    gap: 15px;
}

.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    margin-left: 10px;
    border: none;
    background: #000000;
    cursor: pointer;
    flex-shrink: 0;
    padding: 0;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
    color: #ffffff;
    font-size: 20px;
    line-height: 44px;
    text-align: center;
    font-weight: 700;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    margin: 5px auto;
    background-color: #ffffff;
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.btn {
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 14px;
    letter-spacing: -0.01em;
    transition: all 0.3s ease;
    display: inline-block;
}

.btn-open {
    background-color: #0066ff;
    color: #ffffff;
    border: 2px solid #0066ff;
    white-space: nowrap;
    word-break: keep-all;
}

.btn-open:hover {
    background-color: #0052cc;
    transform: translateY(-2px);
}

.btn-plan {
    background-color: #0066ff;
    color: #ffffff;
    border: 2px solid #0066ff;
}

.btn-plan:hover {
    background-color: #0052cc;
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    background-color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 20px 0;
    gap: 15px;
    min-height: auto;
}

/* 뒤로가기 버튼 (모바일 전용) */
.back-btn {
    color: #0066ff;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    padding: 8px 12px;
    display: inline-block;
    transition: opacity 0.3s ease;
    white-space: nowrap;
    margin-left: 12px;
}

.back-btn:hover {
    opacity: 0.8;
}

.hero-video {
    max-width: 100%;
    width: 100%;
    height: auto;
    max-height: 380px;
    border-radius: 0;
    box-shadow: none;
    object-fit: contain;
}

.video-audio-toggle {
    position: relative;
    margin-top: 10px;
    text-align: center;
}

.audio-play-btn {
    background-color: rgba(0, 0, 0, 0.7);
    color: #ffffff;
    border: 2px solid #ffffff;
    border-radius: 25px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

.audio-play-btn:hover {
    background-color: rgba(0, 0, 0, 0.9);
    transform: scale(1.05);
}

.audio-play-btn:active {
    transform: scale(0.95);
}

.hero .container {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    max-width: 100%;
}

.hero-title-wrapper {
    text-align: center;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.hero-title-blue {
    color: #0066ff;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.3;
    margin: 0;
}

.hero-title-large {
    text-align: center;
    color: #000000;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.3;
    margin: 0;
}

.hero-title {
    text-align: center;
    color: #000000;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.3;
    white-space: nowrap;
}

.hero-title-em {
    color: #00d255;
}

.hero-title-green {
    color: #000000;
}

.button-group {
    display: flex;
    gap: 15px;
    width: 100%;
    max-width: 1000px;
}

/* 인증서 개통 버튼 그룹 */
.cert-auth-buttons {
    display: flex;
    gap: 15px;
    width: 100%;
    max-width: 1000px;
    margin-top: 20px;
    justify-content: center;
}

.cert-auth-btn {
    flex: 1;
    padding: 15px 24px;
    border-radius: 12px;
    background-color: #ffffff;
    color: #000000;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    text-align: center;
    border: 2px solid #e0e0e0;
    transition: all 0.3s ease;
    display: inline-block;
}

.cert-auth-btn-single {
    width: 100%;
    max-width: 100%;
}

.cert-auth-btn:hover {
    border-color: #0066ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.2);
}

/* 카카오 채널 섹션 */
.kakao-channel-section {
    width: 100%;
    max-width: 1000px;
    margin: 20px auto;
    padding: 0 20px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.kakao-channel-link {
    display: block;
    width: 100%;
    background: transparent;
    text-decoration: none;
    cursor: pointer;
}

.kakao-channel-img {
    width: 100%;
    max-width: 100%;
    height: auto;
    display: block;
}

/* 방문 정보 섹션 */
.visit-info-section {
    width: 100%;
    max-width: 1000px;
    margin: 20px auto;
    padding: 0 20px;
}

.visit-info-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
}

.visit-info-left {
    flex: 1;
    font-weight: 700;
    font-size: 18px;
    line-height: 1.6;
}

.visit-info-left p {
    margin: 0;
}

.visit-info-right {
    flex: 1;
    font-size: 15px;
    line-height: 1.6;
    text-align: center;
}

.visit-info-right p {
    margin: 0;
}

.visit-info-right p:first-child {
    font-weight: 700;
    font-size: 16px;
}

.highlight-yellow {
    background-color: #ffeb3b;
    padding: 2px 4px;
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
}

.cert-button {
    flex: 1;
    padding: 15px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    /* make it a flex container */
    flex-direction: column;
    /* stack texts vertically */
    position: relative;
    /* for bottom-fixed CTA */
    padding-bottom: 36px;
    /* space for bottom CTA */
    text-decoration: none;
    color: inherit;
}

.cert-button-yes {
    background-color: #000000;
    border: 2px solid #000000;
}

.cert-button-yes:hover {
    background-color: #000000;
    border: 2px solid #000000;
    transform: translateY(-2px);
}

.cert-button-no {
    background-color: #0066ff;
    border: 2px solid #0066ff;
}

.cert-button-no:hover {
    background-color: #0052cc;
    transform: translateY(-2px);
}

.cert-button p {
    margin: 0;
    line-height: 1.5;
    margin-bottom: 8px;
}

.cert-button p:last-child {
    margin-bottom: 0;
}

.cert-cta {
    position: absolute;
    bottom: 12px;
    left: 0;
    width: 100%;
    text-align: center;
    font-weight: 700;
    font-size: 14px;
    color: #ffffff;
}

.cert-cta-right {
    position: absolute;
    bottom: 12px;
    right: 12px;
    font-weight: 700;
    font-size: 14px;
    color: #ffffff;
    text-align: right;
}

.self-open-link {
    cursor: pointer;
    text-decoration: underline;
}

.cert-title {
    color: rgb(255, 255, 255);
    font-size: 28px;
    font-weight: 700;
    display: block;
    margin-bottom: 5px;
}

.cert-button-yes .cert-title {
    color: #ffffff;
}

.cert-button-no .cert-title {
    color: #ffffff;
}

.cert-subtitle {
    color: rgb(255, 255, 255);
    font-size: 16px;
    margin-top: 5px;
}

.cert-button-no .cert-subtitle {
    color: rgb(255, 255, 255);
}

.cert-list {
    color: rgb(255, 255, 255);
    font-size: 14px;
    margin-top: 8px;
    margin-bottom: 4px;
}

.cert-list-indent {
    color: rgb(255, 255, 255);
    font-size: 14px;
    margin-top: 4px;
    margin-bottom: 8px;
    padding-left: 0px;
}

.cert-desc {
    color: rgb(255, 255, 255);
    font-size: 16px;
    margin-top: 5px;
}

.cert-button-no .cert-desc {
    color: rgb(255, 255, 255);
}

.cert-desc strong {
    font-weight: 700;
}

/* Price Section */
.price-section {
    width: 100%;
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
}

.price-section-title-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    width: 100%;
}

.price-section-title {
    text-align: left;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 0;
    line-height: 1.3;
    flex: 1;
}

.price-section-title-large {
    font-size: 30px;
}

.price-title-blue {
    color: #0066ff;
}

.price-title-black {
    color: #000000;
}

.price-section-subtitle {
    text-align: left;
    font-size: 16px;
    color: #000000;
    margin-bottom: 20px;
    font-weight: 400;
}

/* Usim Intro Section */
.usim-intro-section {
    width: 100%;
    max-width: 1000px;
    margin: 30px auto;
    padding: 0 20px;
    text-align: center;
}

.usim-intro-title-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 20px 0 16px;
}

.usim-intro-title {
    color: #ff69b4;
    font-size: 28px;
    font-weight: 700;
    margin: 0;
    line-height: 1.4;
    flex: 1;
}

.usim-intro-subtitle {
    color: #000000;
    font-size: 30px;
    font-weight: 700;
    margin: 0 0 16px;
    line-height: 1.5;
}

.usim-intro-description {
    color: #ff69b4;
    font-size: 28px;
    font-weight: 700;
    margin: 0;
    line-height: 1.4;
}

/* Usim Method Section */
.usim-method-section {
    display: block;
    width: 100%;
    margin: 20px 0;
}

.usim-method-cards {
    display: flex;
    width: 100%;
    gap: 0;
}

.usim-method-card {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    border: 1px solid #d0d0d0;
    background: #ffffff;
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.usim-method-card:first-child {
    border-right: 1px solid #d0d0d0;
}

.usim-method-card:hover {
    background-color: #f5f5f5;
}

.usim-method-card.active {
    background-color: #e0e0e0;
}

.usim-method-text {
    color: #000000;
    font-size: 16px;
    font-weight: 700;
    text-align: center;
}

.usim-method-warning {
    color: #000000;
    font-size: 14px;
    font-weight: 400;
    text-align: center;
    margin: 12px 16px 0;
    line-height: 1.5;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.usim-method-warning-icon {
    font-size: 1.5em;
    line-height: 1;
    display: inline-block;
    flex-shrink: 0;
    vertical-align: middle;
    margin-right: 4px;
}

.usim-method-warning-text {
    color: #000000;
    font-size: 14px;
    font-weight: 400;
    line-height: 1.5;
    display: inline-flex;
    align-items: center;
}

.usim-rectangle {
    width: 100%;
    height: 10px;
    background-color: #f0f0f0;
    margin: 10px 0;
    border-radius: 4px;
}

.usim-lg-desc {
    display: flex;
    justify-content: center;
    font-size: 14px;
    margin-top: 5px;
    gap: 10px;
    line-height: 1.4;
    width: 100%;
    max-width: 100%;
    padding: 0;
    margin-left: 0;
    margin-right: 0;
    box-sizing: border-box;
}

.usim-lg-desc-left {
    text-align: center;
    flex: 1;
    font-size: 28px;
}

.usim-lg-desc-right {
    text-align: center;
    flex: 1;
    font-size: 20px;
}

.text-hotpink {
    color: #ff69b4;
    font-weight: 700;
}

.text-red {
    color: #ff0000;
    font-weight: 700;
}

.text-black {
    color: #000000;
    font-weight: 700;
}

/* Usim LG Images Section */
.usim-lg-images {
    width: 100%;
    max-width: 1000px;
    margin: 15px auto;
    padding: 0 20px;
}

.usim-lg-images-container {
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-items: flex-start;
    justify-content: center;
}

.usim-lg-image-card {
    flex: 0 0 auto;
    background-color: #ffffff;
    border: none;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.usim-lg-left-img {
    max-width: 100%;
    height: auto;
    display: block;
}

.usim-lg-image-right {
    flex: 0 0 auto;
}

.usim-lg-right-img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Usim Image Wrapper for transparent button */
.usim-lg-image-wrapper {
    position: relative;
    display: inline-block;
    width: 100%;
}

/* Transparent button overlay on left image */
.usim-transparent-btn {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: transparent;
    display: block;
    z-index: 10;
    cursor: pointer;
}

/* Action buttons below images */
.usim-action-btn {
    display: block;
    width: 100%;
    padding: 14px 20px;
    margin-top: 15px;
    background-color: #0066ff;
    color: #ffffff;
    text-align: center;
    text-decoration: none;
    font-weight: 700;
    font-size: 26px;
    border-radius: 8px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.usim-action-btn:hover {
    background-color: #0052cc;
    transform: translateY(-2px);
}

.price-cards-container {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.plan-type-buttons {
    display: flex;
    gap: 20px;
    margin: 30px 0;
    justify-content: center;
}

.plan-type-btn {
    display: inline-block;
    padding: 12px 60px;
    border: 2px solid #000000;
    border-radius: 8px;
    text-decoration: none;
    color: #000000;
    font-weight: 700;
    font-size: 16px;
    text-align: center;
    transition: all 0.3s ease;
    background-color: #ffffff;
}


.plan-type-btn:hover {
    background-color: #f5f5f5;
    transform: translateY(-2px);
}

.price-info-card {
    background-color: #ffffff;
    border: 2px solid #0066ff;
    border-radius: 12px;
    padding: 24px;
    max-width: 500px;
    flex: 1;
    min-width: 300px;
    opacity: 0;
}

.slide-in-left {
    animation: slideInLeft 0.8s ease-out forwards;
}

.slide-in-right {
    animation: slideInRight 0.8s ease-out forwards;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.price-info-title {
    color: #0066ff;
    font-weight: 700;
    font-size: 24px;
    margin-bottom: 16px;
    line-height: 1.4;
}

.price-info-text {
    color: #000000;
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
}


.price-info-highlight {
    color: #0066ff;
    font-size: 17px;
    font-weight: 700;
}

.cta-row-center {
    justify-content: center;
}

.cta-btn-wide {
    max-width: 600px;
    width: 100%;
}

.price-card {
    background-color: #ffffff;
    border: 2px solid #0066ff;
    border-radius: 12px;
    padding: 24px;
    max-width: 500px;
    flex: 1;
    min-width: 300px;
    position: relative;
}

.price-main {
    margin-bottom: 16px;
}

.price-amount {
    color: #0066ff;
    font-weight: 700;
    font-size: 32px;
    display: block;
}

.price-feature {
    color: #000000;
    font-size: 16px;
    margin-bottom: 8px;
    line-height: 1.5;
}

.price-popular {
    margin-top: 16px;
    padding-top: 12px;
}

.price-popular-text {
    color: #0066ff;
    font-size: 13px;
    font-weight: 700;
    text-decoration: underline;
    text-decoration-color: #0066ff;
    text-underline-offset: 4px;
}

.price-popular-text-underline {
    color: #0066ff;
    text-decoration: underline;
    text-decoration-color: #0066ff;
    text-underline-offset: 4px;
}

.price-card-top-right {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
}

.price-carrier-group {
    display: flex;
    gap: 8px;
}

.price-carrier {
    font-size: 14px;
    font-weight: 700;
}

.price-carrier-kt {
    color: #0066ff;
}

.price-carrier-lg {
    color: #ff69b4;
}

.price-unlimited {
    color: #0066ff;
    font-size: 14px;
    font-weight: 700;
    margin: 0;
}

.price-card-bottom-right {
    position: absolute;
    bottom: 16px;
    right: 16px;
}

.price-monthly {
    color: #000000;
    font-size: 16px;
    font-weight: 700;
}

.price-monthly-blue {
    color: #0066ff;
}

.price-feature-blue-underline {
    color: #0066ff;
    text-decoration: underline;
    text-decoration-color: #0066ff;
    text-underline-offset: 4px;
}

@media (min-width: 769px) {
    .price-amount {
        font-size: 30px;
    }

    .price-feature-bottom-left {
        position: absolute;
        bottom: 16px;
        left: 24px;
        margin: 0;
    }
}

/* Card Section */
.card-section {
    display: flex;
    flex-direction: row;
    gap: 8px;
    width: 100%;
    max-width: 1000px;
    margin-top: 10px;
    justify-content: center;
    align-items: flex-start;
}

.card-section.only-desktop {
    display: flex;
}

.card-item {
    flex: 1;
    background-color: transparent;
    border-radius: 12px;
    padding: 0;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: auto;
}

.card-item:hover {
    transform: translateY(-4px);
}

.card-item>a {
    display: block;
    background-color: transparent;
    /* remove fill */
    border-radius: 12px;
    padding: 10px;
    height: 160px;
    /* desktop card height (match reference-like size) */
    overflow: hidden;
    border: none;
    /* no border on desktop */
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.06);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Remove colored borders on desktop */
.card-section .card-item:nth-child(-n+2)>a,
.card-section .card-item:nth-child(n+3)>a {
    border: none;
}

.card-item:hover>a {
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}

.card-item img {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    display: block;
    margin: 0 auto;
    border-radius: 12px;
    /* slight rounding to match rectangle */
    flex-shrink: 0;
    animation: float-icon 2.4s ease-in-out infinite;
}

.card-text {
    margin-top: 10px;
    padding-top: 0;
    width: 100%;
}

.card-text a {
    text-decoration: none;
    color: #000000;
    /* card caption in black */
    font-size: 14px;
    font-weight: 700;
    transition: color 0.3s ease;
}

.card-text a:hover {
    color: #000000;
    /* stay black on hover */
}

.card-item:hover .card-text a {
    color: #000000;
    /* keep black when hovering card */
}

.card-text strong {
    font-weight: 700;
}

/* ===== Mobile Intro under card-section ===== */
.intro-mobile {
    display: none;
    width: 100%;
    max-width: 1000px;
    margin-top: 12px;
    justify-content: center;
}

.intro-mobile__text {
    width: 100%;
    text-align: center;
}

.intro-mobile__text h5 {
    line-height: 1.5;
    font-size: 16px;
    color: #000000;
}

.intro-mobile__brand {
    color: #00d255;
    /* 서울모바일 강조 색을 초록으로 */
}

.intro-mobile__brand-blue {
    color: #0066ff;
    /* 서울모바일 강조 색을 파란색으로 */
    font-size: 1.15em;
    /* 다른 글자보다 1~2 크게 */
}

/* Quick links (mobile only) */
.quick-links {
    display: none;
    width: 100%;
    max-width: 1000px;
    margin-top: 12px;
}

.quick-link {
    display: block;
    width: 100%;
    text-align: center;
    padding: 12px;
    margin: 6px 0;
    background: #ffffff;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    color: #000000;
    font-weight: 700;
    text-decoration: none;
}

.quick-link:active {
    transform: translateY(1px);
}

/* Responsive text toggles */
.only-mobile {
    display: none;
}

.only-desktop {
    display: inline;
}

@keyframes float-icon {
    0% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-6px);
    }

    100% {
        transform: translateY(0);
    }
}

/* Social Buttons */
.social-buttons {
    display: flex;
    gap: 15px;
    width: 100%;
    max-width: 1000px;
    margin-top: 15px;
    justify-content: center;
    align-items: center;
}

.social-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    overflow: hidden;
    padding: 0;
}

.social-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.foot-sociallink {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 15px;
}

._sns_link_list {
    display: flex;
    gap: 12px;
    align-items: center;
    justify-content: center;
}

.sns-btn {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: transparent;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: transform 0.2s ease, opacity 0.2s ease;
    text-decoration: none;
    overflow: hidden;
    border: none;
    padding: 0;
    font-size: 12.0132px;
}

.sns-btn:hover {
    transform: translateY(-2px);
    opacity: 0.8;
}

.sns-btn img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

@media (max-width: 768px) {
    .hero {
        padding: 0;
        /* 헤더 아래 여백 제거 */
        margin-left: 0;
        margin-right: 0;
        width: 100%;
        padding-left: 0;
        padding-right: 0;
    }

    .foot-sociallink {
        justify-content: center;
        margin-top: 0;
        margin-bottom: 8px;
        /* 붙여서 보이되 살짝 숨 쉴 공간 */
    }

    ._sns_link_list {
        gap: 16px;
    }

    .sns-btn {
        width: 30px;
        height: 30px;
    }

    .usim-lg-desc {
        justify-content: space-between;
        flex-direction: row;
        margin-bottom: -10px;
    }

    .usim-lg-desc-left {
        text-align: left !important;
        font-size: 14px;
        padding-left: 20px;
        align-self: flex-start;
        line-height: 1.6;
    }

    .usim-lg-desc-right {
        text-align: right;
        font-size: 8px;
        padding-right: 20px;
        line-height: 1.2;
        word-break: keep-all;
    }

    .usim-lg-images-container {
        flex-direction: column;
        align-items: center;
    }

    .usim-lg-images {
        margin: 0px auto;
    }

    .usim-lg-left-img,
    .usim-lg-right-img {
        filter: contrast(1.1) brightness(1.05);
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
        width: 100%;
        max-width: 100%;
    }

    /* 모바일에서 카드 섹션 이미지 크기 증가 */
    .usim-lg-image-card {
        width: 100%;
        max-width: 100%;
    }

    .usim-lg-image-card picture,
    .usim-lg-image-card img {
        width: 100%;
        max-width: 100%;
    }

    /* 모바일 투명 버튼 높이 조정 */
    .usim-transparent-btn {
        height: 50px;
    }

    /* 모바일 액션 버튼 스타일 */
    .usim-action-btn {
        padding: 12px 16px;
        font-size: 22px;
        margin-top: 12px;
    }

    .usim-lg-page .back-btn {
        color: #ff69b4;
    }

    .usim-kt-page .back-btn {
        color: #ff0000;
    }
}

@media (max-width: 400px) {
    .usim-lg-desc-right {
        font-size: 7.5px;
        line-height: 1.15;
    }
}

.social-btn img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 8px;
}

.social-naver {
    background-color: #ffffff;
}

.social-naver:hover {
    background-color: #f5f5f5;
}

.social-instagram {
    background-color: #ffffff;
}

.social-instagram:hover {
    background-color: #f5f5f5;
}

.social-youtube {
    background-color: #ffffff;
}

.social-youtube:hover {
    background-color: #f5f5f5;
}

.social-tistory {
    background-color: #ffffff;
}

.social-tistory:hover {
    background-color: #f5f5f5;
}

/* Footer */
.footer {
    background-color: #ffffff;
    padding: 30px 0;
    margin-top: 30px;
    border-top: 1px solid #e0e0e0;
}

.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.footer-logo {
    margin: 15px 0;
    text-align: center;
}

.footer-logo img {
    max-width: 120px;
    height: auto;
    display: block;
    margin: 0 auto;
}

.hero-footer {
    width: 100%;
    padding-top: 16px;
    margin-top: 16px;
    border-top: 1px solid #e0e0e0;
}

.hours-info {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 10px 16px 6px;
    color: #000000;
    font-size: 12px;
    line-height: 1.5;
    padding: 12px 16px;
    background-color: #f5f5f5;
    border-radius: 8px;
}


.hours-logo {
    height: 40px;
    width: auto;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .hours-logo {
        height: 55px;
    }
}

.hours-info p {
    margin: 0;
    text-align: left;
}

.cta-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    width: 100%;
    max-width: 1000px;
    margin: 8px 0 10px;
}

.cta-btn {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    padding: 12px 14px;
    border-radius: 9999px;
    text-decoration: none;
    font-weight: 700;
    font-size: 14px;
    border: 2px solid;
    flex: 1 1 0;
    min-width: 0;
}

.cta-kakao {
    border-color: #00d255;
    color: #00d255;
    background: transparent;
}

.cta-kakao:hover {
    background: rgba(0, 210, 85, 0.12);
}

.cta-call {
    border-color: #000000;
    color: #000000;
    background: transparent;
}

.cta-call:hover {
    background: #f1f1f1;
}

.cta-blue {
    background-color: #0066ff;
    color: #ffffff;
    border: 2px solid #0066ff;
}

.cta-blue:hover {
    background-color: #0052cc;
    border-color: #0052cc;
}

.links-section {
    display: block;
    width: 100%;
    max-width: 1000px;
    margin: 20px auto;
    padding: 0 20px;
}

.link-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    width: 100%;
    max-width: 1000px;
    margin: 8px 0 10px;
}

.link-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #f6f6f6;
    border-radius: 12px;
    padding: 12px;
    text-decoration: none;
}

.link-card-line {
    font-size: 14px;
    color: #606060;
    line-height: 1.4;
}

.custom-text-info {
    text-align: center;
    width: 100%;
}

.custom-text-info p {
    margin: 8px 0;
    line-height: 1.6;
}

.footer-info,
.footer-contact,
.footer-credit,
.footer-copyright {
    font-size: 10px;
    color: rgb(97, 95, 95);
    font-weight: 400;
}


/* Responsive Design */
@media (max-width: 768px) {
    .only-mobile {
        display: inline;
    }

    .only-desktop {
        display: none !important;
    }

    .card-section.only-desktop {
        display: none !important;
    }

    .intro-mobile {
        display: flex;
        justify-content: center;
    }

    .intro-mobile__text {
        width: 100%;
        text-align: center;
    }

    .quick-links {
        display: block;
    }

    .nav {
        flex-direction: row;
        align-items: center;
        gap: 0;
    }

    .logo {
        margin-right: auto;
    }

    .logo img {
        height: 64px;
    }

    .nav-menu {
        display: none;
    }

    .header-buttons {
        display: none;
    }

    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: transparent;
        /* remove outer circle */
        color: #0066ff;
        /* blue bars/icon */
        border: 0;
        /* remove border */
        box-shadow: none;
        /* remove shadow */
    }

    .hero .container {
        padding: 0;
        padding-left: 0;
        padding-right: 0;
        border-radius: 0;
        max-width: 100%;
        gap: 10px;
        margin-left: 0;
        margin-right: 0;
        width: 100%;
    }

    .hero-title-wrapper {
        padding: 0 16px;
        text-align: left;
        margin-top: 24px;
    }

    .hero-title-blue {
        font-size: 18px;
        text-align: left;
    }

    .hero-title-large {
        font-size: 24px;
        text-align: left;
    }

    .hero-title {
        font-size: 20px;
        /* larger on mobile per request */
        white-space: normal;
        text-align: left;
        padding-left: 16px;
    }

    .hero-title-green {
        display: block;
        margin-top: 6px;
        text-align: center;
        padding-left: 0;
    }

    .hero-title-em {
        font-size: 22px;
        /* emphasize the green part on mobile */
    }

    .hero-video {
        max-width: 100%;
        width: 100%;
        border-radius: 0;
        object-fit: cover;
        height: auto;
        display: block;
        margin-left: 0;
        margin-right: 0;
    }

    .video-audio-toggle {
        margin-top: 8px;
        padding: 0 16px;
    }

    .audio-play-btn {
        padding: 12px 24px;
        font-size: 16px;
        width: 100%;
        max-width: 200px;
    }

    .button-group {
        flex-direction: row;
        gap: 8px;
        padding: 0;
        justify-content: center;
        flex-wrap: wrap;
    }

    .cert-auth-buttons {
        flex-direction: column;
        gap: 12px;
        padding: 0 16px;
        margin-top: 15px;
    }

    .cert-auth-btn {
        width: 100%;
        padding: 14px 20px;
        font-size: 15px;
    }

    .kakao-channel-section {
        margin: 15px auto;
        padding: 0 16px;
    }

    .kakao-channel-img {
        width: 100%;
        max-width: 100%;
    }

    .visit-info-section {
        margin: 15px auto;
        padding: 0 16px;
    }

    .visit-info-container {
        flex-direction: row;
        gap: 12px;
        align-items: flex-start;
    }

    .visit-info-left {
        font-size: 14px;
        text-align: left;
        flex: 1;
    }

    .visit-info-right {
        font-size: 10px;
        text-align: center;
        flex: 1;
    }

    .visit-info-right p:first-child {
        font-size: 11px;
    }

    .cert-button {
        padding: 24px 12px;
        border-radius: 12px;
        min-width: 0;
        flex: 0 0 calc(45% - 8px);
        max-width: calc(45% - 8px);
        min-height: 285px;
        /* 1.5x taller than before */
    }

    .cert-title {
        font-size: 22px;
        /* larger title on mobile */
    }

    .cert-subtitle,
    .cert-desc {
        font-size: 14px;
        /* larger subtitle/desc on mobile */
    }

    .cert-cta {
        font-size: 16px;
        /* larger bottom CTA on mobile */
    }

    .card-section {
        flex-direction: row;
        flex-wrap: nowrap;
        gap: 0;
        /* remove gaps */
        padding: 0;
        /* no outer padding */
        justify-content: flex-start;
    }

    .card-section.only-desktop {
        display: none !important;
    }

    .index-2-page .card-section {
        display: none;
    }

    .card-item {
        padding: 0;
        /* no inner gap */
        min-height: 0;
        flex: 0 0 25%;
        /* 4 columns */
        max-width: 25%;
        min-width: 25%;
    }

    .card-item>a {
        width: 100%;
        height: 120px;
        /* uniform rectangle height */
        border-radius: 12px;
        padding: 6px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .card-item img {
        width: auto;
        height: auto;
        max-width: 100%;
        max-height: 100%;
        border-radius: 12px;
        object-fit: contain;
    }

    .card-text a {
        font-size: 13px;
    }

    .social-buttons {
        flex-wrap: wrap;
        gap: 10px;
    }

    .social-btn {
        width: 50px;
        height: 50px;
    }

    .footer-logo img {
        max-width: 60px;
        /* smaller logo on mobile footer */
    }

    .footer-credit {
        font-size: 10px;
        font-weight: 400;
    }

    .hours-section {
        margin: 0;
        padding: 0;
        width: 100%;
    }

    .hours-info {
        margin: 10px 0 6px;
        padding: 12px 16px;
        border-radius: 0;
        width: 100%;
        max-width: 100%;
        justify-content: flex-start;
    }

    .hours-info p {
        text-align: left;
    }

    .cta-section {
        margin: 0;
        padding: 0;
        width: 100%;
    }

    .cta-row {
        margin: 8px 0 10px;
        padding: 0 16px;
        gap: 8px;
        width: 100%;
        max-width: 100%;
    }

    .cta-btn {
        padding: 18px 20px;
        font-size: 13px;
        flex: 1;
        min-width: 0;
        max-width: none;
        white-space: nowrap;
    }

    .cta-btn-wide {
        white-space: nowrap;
    }

    .links-section {
        margin: 0;
        padding: 0;
        width: 100%;
    }

    .link-cards {
        margin: 8px 0 10px;
        gap: 0;
        padding: 0;
        width: 100%;
        max-width: 100%;
    }

    .link-card {
        border-radius: 0;
    }

    .price-card {
        padding: 16px;
    }

    .price-main {
        margin-bottom: 12px;
    }

    .price-amount {
        font-size: 23px;
    }

    .price-feature {
        font-size: 14px;
        margin-bottom: 6px;
    }

    .price-popular {
        margin-top: 12px;
        padding-top: 8px;
    }

    .price-card-top-right {
        top: 12px;
        right: 12px;
        gap: 6px;
    }

    .price-card-bottom-right {
        bottom: 12px;
        right: 12px;
    }

    .price-cards-container {
        gap: 12px;
    }

    .price-section-subtitle {
        font-weight: 700;
    }

    .plan-type-buttons {
        flex-direction: row;
        gap: 0;
        margin: 20px 0;
        border: none;
        border-radius: 0;
        overflow: hidden;
    }

    .plan-type-btn {
        padding: 10px 20px;
        font-weight: 400;
        background-color: #e8e8e8;
        flex: 1;
        white-space: nowrap;
        border-radius: 0;
        border: none;
        border-right: 1px solid #d0d0d0;
    }

    .plan-type-btn:first-child {
        background-color: #f5f5f5;
    }

    .plan-type-btn:last-child {
        border-right: none;
        background-color: #e8e8e8;
    }

    .price-info-text {
        font-size: 14px;
    }

    .usim-intro-section {
        padding: 0 16px;
        text-align: left;
        margin: 20px auto;
    }

    .usim-intro-title-wrapper {
        margin: 16px 0 12px;
        justify-content: space-between;
        align-items: center;
    }

    .usim-intro-title {
        font-size: 20px;
        text-align: left;
        margin: 0;
        flex: 1;
    }

    .usim-intro-section .back-btn {
        color: #ff69b4;
        margin-left: 12px;
        margin-right: 0;
    }

    .usim-intro-subtitle {
        font-size: 22px;
        text-align: left;
        margin: 0 0 12px;
    }

    .usim-intro-description {
        font-size: 20px;
        text-align: left;
        margin: 0;
    }

    .usim-intro-subtitle-small {
        font-size: 22px;
    }

    .usim-intro-description-small {
        font-size: 20px;
    }

    .usim-method-section {
        display: block;
        margin: 20px 0;
        padding: 0;
        width: 100%;
    }

    .usim-method-cards {
        width: 100%;
        margin: 0;
        padding: 0;
    }

    .usim-method-card {
        border-radius: 0;
        border-left: none;
        border-right: 1px solid #d0d0d0;
        border-top: 1px solid #d0d0d0;
        border-bottom: 1px solid #d0d0d0;
    }

    .usim-method-card:first-child {
        border-left: none;
    }

    .usim-method-card:last-child {
        border-right: none;
    }

    .usim-method-warning-icon {
        font-size: 1.3em;
        line-height: 1;
        vertical-align: middle;
    }
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -260px;
    width: 260px;
    height: 100vh;
    background-color: #0066ff;
    color: #ffffff;
    z-index: 1000;
    transition: right 0.3s ease;
}

.mobile-menu.open {
    right: 0;
}

.mobile-menu-inner {
    padding: 20px 20px 40px;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.mobile-menu-inner ul {
    order: 1;
}

.mobile-menu-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 12px;
    padding-top: 12px;
    order: 2;
}

.mobile-menu .btn {
    display: block;
    width: 100%;
    text-align: center;
    border-radius: 12px;
}

.mobile-menu .btn-open,
.mobile-menu .btn-plan {
    background: transparent;
    color: #ffffff;
    border: 2px solid #ffffff;
}

.mobile-menu .btn-open:hover,
.mobile-menu .btn-plan:hover {
    background: rgba(255, 255, 255, 0.2);
}

.mobile-menu-close {
    align-self: flex-end;
    border: none;
    background: transparent;
    color: #ffffff;
    font-size: 28px;
    cursor: pointer;
    margin-bottom: 10px;
}

.mobile-menu ul {
    list-style: none;
    padding: 0;
    margin: 20px 0 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mobile-menu a {
    color: #ffffff;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
}

.mobile-menu a:hover {
    color: #ffffff;
    opacity: 0.8;
}

.mobile-menu-open {
    overflow: hidden;
}

/* Floating KakaoTalk Button */
.floating-kakao {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background-color: #FEE500;
    /* Kakao Yellow */
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18), 0 2px 8px rgba(0, 0, 0, 0.12);
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    z-index: 1100;
}

.floating-kakao:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(0, 0, 0, 0.22), 0 4px 12px rgba(0, 0, 0, 0.14);
}

.kakao-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    min-width: 20px;
    height: 20px;
    padding: 0 6px;
    border-radius: 999px;
    background: #FF3B30;
    /* iOS-like red */
    color: #ffffff;
    font-size: 12px;
    font-weight: 800;
    line-height: 20px;
    display: inline-block;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

@media (max-width: 768px) {
    .floating-kakao {
        right: 14px;
        bottom: 14px;
        width: 56px;
        height: 56px;
    }

    .floating-kakao svg {
        width: 24px;
        height: 24px;
    }

    .kakao-badge {
        top: -6px;
        right: -6px;
    }
}