/* =========================================================
   theme/ace/landing4.php 전용 (gt-landing-claude)
   - 기존 main.css(gt-landing-page) 토큰을 따르되,
     본 페이지에서만 정보 위계와 리듬을 강화한다.
   - 색상: primary #2B3467, dark #1a2233, gray #6b7280, line #e5e7ea
   ========================================================= */

body.gt-landing-claude {
    --gt-c-primary: #2B3467;
    --gt-c-primary-soft: #ebedf4;
    --gt-c-primary-dark: #222b52;
    --gt-c-ink: #1a2233;
    --gt-c-text: #3a4256;
    --gt-c-mute: #6b7280;
    --gt-c-line: #e5e7ea;
    --gt-c-soft: #f5f7fa;
    --gt-c-radius: 14px;
    --gt-c-shadow-sm: 0 1px 2px rgba(20, 30, 60, .04), 0 4px 12px rgba(20, 30, 60, .06);
    --gt-c-shadow-md: 0 4px 14px rgba(20, 30, 60, .08), 0 18px 40px rgba(20, 30, 60, .08);
    color: var(--gt-c-text);
    -webkit-font-smoothing: antialiased;
}

body.gt-landing-claude .gt-c-wrap {
    max-width: 100%;
    background: #fff;
}

/* ===== 상단 프로모 띠 ===== */
body.gt-landing-claude .gt-c-promo {
    position: sticky;
    top: 0;
    z-index: 1035;
    background: #2B3467;
    color: #fff;
    padding: .65rem 1rem;
    font-size: .9375rem;
    font-weight: 500;
    letter-spacing: -.01em;
}
body.gt-landing-claude .gt-c-promo strong { font-weight: 700; }
body.gt-landing-claude .gt-c-promo-dot {
    display: inline-block;
    width: 6px; height: 6px;
    background: #ffd75a;
    border-radius: 50%;
    margin-right: .5rem;
    vertical-align: middle;
    box-shadow: 0 0 0 4px rgba(255, 215, 90, .25);
}

/* ===== Navbar ===== */
body.gt-landing-claude .gt-c-navbar {
    padding-top: .85rem;
    padding-bottom: .85rem;
}
body.gt-landing-claude .gt-c-nav-links a {
    color: var(--gt-c-text);
    text-decoration: none;
    margin-right: 1.25rem;
    font-weight: 500;
    transition: color .15s ease;
}
body.gt-landing-claude .gt-c-nav-links a:hover,
body.gt-landing-claude .gt-c-nav-links a:focus {
    color: var(--gt-c-primary);
}
body.gt-landing-claude .gt-c-navbar .navbar-brand img { max-height: 36px; }
body.gt-landing-claude .gt-c-navbar .navbar-brand span { font-size: 1.0625rem; }

/* ===== 공통 섹션 토큰 ===== */
body.gt-landing-claude .gt-c-section {
    padding: 5.5rem 0;
}
body.gt-landing-claude .gt-c-section-head {
    max-width: 720px;
    margin: 0 auto 3.5rem;
}
body.gt-landing-claude .gt-c-eyebrow {
    display: inline-block;
    font-size: .8125rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--gt-c-primary);
    background: var(--gt-c-primary-soft);
    padding: .35rem .75rem;
    border-radius: 999px;
    margin-bottom: 1rem;
}
body.gt-landing-claude .gt-c-section-title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: -.02em;
    color: var(--gt-c-ink);
    margin-bottom: 1rem;
}
body.gt-landing-claude .gt-c-section-sub {
    font-size: 1.0625rem;
    line-height: 1.65;
    color: var(--gt-c-mute);
    margin-bottom: 0;
}

/* ===== HERO ===== */
body.gt-landing-claude .gt-c-hero {
    padding: 5rem 0 5.5rem;
    background:
        radial-gradient(ellipse 60% 60% at 90% 10%, rgba(43, 52, 103, .07), transparent 60%),
        linear-gradient(180deg, #fff 0%, #f9fafc 100%);
}
body.gt-landing-claude .gt-c-hero-title {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -.025em;
    color: var(--gt-c-ink);
    margin: 1rem 0 1.25rem;
}
body.gt-landing-claude .gt-c-hero-brand {
    display: block;
    font-size: 1.125rem;
    font-weight: 800;
    letter-spacing: -.02em;
    color: var(--gt-c-primary);
    margin-bottom: .35rem;
}
body.gt-landing-claude .gt-c-hl {
    color: var(--gt-c-primary);
    background: linear-gradient(180deg, transparent 60%, rgba(43, 52, 103, .18) 60%);
    padding: 0 .15em;
}
body.gt-landing-claude .gt-c-hero-lead {
    font-size: 1.1875rem;
    line-height: 1.65;
    color: var(--gt-c-text);
    margin-bottom: 2rem;
    max-width: 32em;
}
body.gt-landing-claude .gt-c-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-bottom: 1.75rem;
}
body.gt-landing-claude .gt-c-cta-row--center { justify-content: center; }

body.gt-landing-claude .gt-c-btn-primary,
body.gt-landing-claude .gt-c-btn-secondary {
    border-radius: 10px;
    padding: .85rem 1.5rem;
    font-weight: 700;
    letter-spacing: -.01em;
    transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
body.gt-landing-claude .btn-primary {
    background-color: var(--gt-c-primary);
    border-color: var(--gt-c-primary);
}
body.gt-landing-claude .btn-primary:hover,
body.gt-landing-claude .btn-primary:focus {
    background-color: var(--gt-c-primary-dark);
    border-color: var(--gt-c-primary-dark);
}
body.gt-landing-claude .gt-c-btn-primary {
    background: var(--gt-c-primary);
    border-color: var(--gt-c-primary);
    box-shadow: 0 6px 18px rgba(43, 52, 103, .28);
}
body.gt-landing-claude .gt-c-btn-primary:hover,
body.gt-landing-claude .gt-c-btn-primary:focus {
    background: var(--gt-c-primary-dark);
    border-color: var(--gt-c-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 8px 22px rgba(43, 52, 103, .35);
}
body.gt-landing-claude .gt-c-btn-secondary {
    border-color: var(--gt-c-line);
    color: var(--gt-c-ink);
    background: #fff;
}
body.gt-landing-claude .gt-c-btn-secondary:hover,
body.gt-landing-claude .gt-c-btn-secondary:focus {
    border-color: var(--gt-c-ink);
    color: var(--gt-c-ink);
    background: #fff;
}
body.gt-landing-claude .gt-c-btn-arrow {
    display: inline-block;
    margin-left: .35em;
    transition: transform .15s ease;
}
body.gt-landing-claude .gt-c-btn-primary:hover .gt-c-btn-arrow { transform: translateX(3px); }

body.gt-landing-claude .gt-c-hero-bullets {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: .5rem 1.25rem;
    color: var(--gt-c-mute);
    font-size: .9375rem;
}
body.gt-landing-claude .gt-c-hero-bullets li { display: inline-flex; align-items: center; }
body.gt-landing-claude .gt-c-check {
    display: inline-flex;
    align-items: center; justify-content: center;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--gt-c-primary-soft);
    color: var(--gt-c-primary);
    font-size: .7rem;
    margin-right: .4rem;
    font-weight: 700;
}
body.gt-landing-claude .gt-c-hero-bullets strong { color: var(--gt-c-ink); }

body.gt-landing-claude .gt-c-hero-visual {
    position: relative;
    border-radius: var(--gt-c-radius);
    overflow: hidden;
    box-shadow: var(--gt-c-shadow-md);
    background: #fff;
}
body.gt-landing-claude .gt-c-hero-visual img { display: block; width: 100%; height: auto; }
body.gt-landing-claude .gt-c-hero-visual picture { display: block; }
body.gt-landing-claude .gt-c-hero-visual-shadow {
    position: absolute;
    inset: -20px -20px auto auto;
    width: 220px; height: 220px;
    background: radial-gradient(circle, rgba(43, 52, 103, .18), transparent 70%);
    z-index: -1;
    filter: blur(20px);
}

/* ===== FEATURES (탭) ===== */
body.gt-landing-claude .gt-c-section-features { background: var(--gt-c-soft); }

body.gt-landing-claude .gt-c-tab-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: .75rem;
    margin-bottom: 2.5rem;
}
body.gt-landing-claude .gt-c-tab {
    background: #fff;
    border: 1px solid var(--gt-c-line);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    text-align: left;
    cursor: pointer;
    transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
    color: var(--gt-c-ink);
}
body.gt-landing-claude .gt-c-tab:hover {
    border-color: var(--gt-c-primary);
    box-shadow: var(--gt-c-shadow-sm);
}
body.gt-landing-claude .gt-c-tab.is-active {
    border-color: var(--gt-c-primary);
    background: linear-gradient(180deg, #fff 0%, #f3f4f9 100%);
    box-shadow: 0 0 0 3px rgba(43, 52, 103, .12);
}
body.gt-landing-claude .gt-c-tab-num {
    display: block;
    font-family: 'Inter', monospace;
    font-size: .75rem;
    font-weight: 700;
    color: var(--gt-c-primary);
    margin-bottom: .25rem;
    letter-spacing: .05em;
}
body.gt-landing-claude .gt-c-tab-label {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.3;
}
body.gt-landing-claude .gt-c-tab-panels {
    background: #fff;
    border-radius: var(--gt-c-radius);
    padding: 2.5rem;
    box-shadow: var(--gt-c-shadow-sm);
}
body.gt-landing-claude .gt-c-tab-panel { display: none; }
body.gt-landing-claude .gt-c-tab-panel.is-active { display: block; animation: gtcFade .25s ease; }
@keyframes gtcFade {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}
body.gt-landing-claude .gt-c-tag {
    display: inline-block;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .04em;
    color: var(--gt-c-primary);
    background: var(--gt-c-primary-soft);
    padding: .3rem .65rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}
body.gt-landing-claude .gt-c-feature-title {
    font-size: 1.625rem;
    font-weight: 800;
    line-height: 1.3;
    color: var(--gt-c-ink);
    margin-bottom: .85rem;
    letter-spacing: -.02em;
}
body.gt-landing-claude .gt-c-feature-desc {
    color: var(--gt-c-mute);
    font-size: 1.0625rem;
    line-height: 1.65;
    margin-bottom: 0;
}
body.gt-landing-claude .gt-c-feature-img {
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--gt-c-line);
    background: var(--gt-c-soft);
}
body.gt-landing-claude .gt-c-feature-img picture { display: block; }
body.gt-landing-claude .gt-c-feature-img img { display: block; width: 100%; height: auto; }

/* ===== BEFORE / AFTER ===== */
body.gt-landing-claude .gt-c-section-compare { background: #fff; }

body.gt-landing-claude .gt-c-compare-table {
    max-width: 980px;
    margin: 0 auto;
    border: 1px solid var(--gt-c-line);
    border-radius: var(--gt-c-radius);
    overflow: hidden;
    box-shadow: var(--gt-c-shadow-sm);
    background: #fff;
}
body.gt-landing-claude .gt-c-compare-header,
body.gt-landing-claude .gt-c-compare-row {
    display: grid;
    grid-template-columns: 1fr 48px 1fr;
    align-items: stretch;
}
body.gt-landing-claude .gt-c-compare-header {
    background: var(--gt-c-soft);
    border-bottom: 1px solid var(--gt-c-line);
}
body.gt-landing-claude .gt-c-compare-row + .gt-c-compare-row {
    border-top: 1px solid var(--gt-c-line);
}
body.gt-landing-claude .gt-c-compare-col {
    padding: 1.5rem 1.75rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
body.gt-landing-claude .gt-c-compare-col--before { color: var(--gt-c-mute); }
body.gt-landing-claude .gt-c-compare-col--after  {
    background: linear-gradient(135deg, #f3f4f9 0%, #ebedf4 100%);
    color: var(--gt-c-ink);
    font-weight: 500;
}
body.gt-landing-claude .gt-c-compare-col p { margin: 0; line-height: 1.6; }
body.gt-landing-claude .gt-c-compare-label {
    display: inline-flex;
    align-items: center;
    font-size: .8125rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
}
body.gt-landing-claude .gt-c-compare-label--before { color: var(--gt-c-mute); }
body.gt-landing-claude .gt-c-compare-label--after  { color: var(--gt-c-primary); }
body.gt-landing-claude .gt-c-compare-arrow {
    display: flex;
    align-items: center; justify-content: center;
    color: var(--gt-c-primary);
    font-size: 1.25rem;
    background: #fff;
    border-left: 1px solid var(--gt-c-line);
    border-right: 1px solid var(--gt-c-line);
}
body.gt-landing-claude .gt-c-compare-mobile-label { display: none; }

body.gt-landing-claude .gt-c-compare-foot {
    color: var(--gt-c-mute);
    font-size: .9375rem;
    margin: 2.25rem 0 0;
}

/* ===== 학교 단위 운영 ===== */
body.gt-landing-claude .gt-c-section-school { background: var(--gt-c-soft); }
body.gt-landing-claude .gt-c-school-visual {
    border-radius: var(--gt-c-radius);
    overflow: hidden;
    box-shadow: var(--gt-c-shadow-md);
    background: #fff;
}
body.gt-landing-claude .gt-c-school-visual picture { display: block; }
body.gt-landing-claude .gt-c-school-visual img { display: block; width: 100%; height: auto; }
body.gt-landing-claude .gt-c-pillar-list {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0 0;
}
body.gt-landing-claude .gt-c-pillar-list li {
    display: flex;
    align-items: flex-start;
    padding: 1.25rem 0;
    border-top: 1px solid var(--gt-c-line);
}
body.gt-landing-claude .gt-c-pillar-list li:first-child { border-top: 0; padding-top: 0; }
body.gt-landing-claude .gt-c-pillar-num {
    flex: 0 0 36px;
    width: 36px; height: 36px;
    border-radius: 10px;
    background: var(--gt-c-primary-soft);
    color: var(--gt-c-primary);
    font-weight: 700;
    display: inline-flex;
    align-items: center; justify-content: center;
    margin-right: 1rem;
    font-size: .9375rem;
}
body.gt-landing-claude .gt-c-pillar-title {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--gt-c-ink);
    margin: .15rem 0 .35rem;
    line-height: 1.4;
}
body.gt-landing-claude .gt-c-pillar-desc {
    color: var(--gt-c-mute);
    font-size: .9375rem;
    line-height: 1.55;
    margin: 0;
}

/* ===== FAQ (details/summary) ===== */
body.gt-landing-claude .gt-c-section-faq { background: #fff; }
body.gt-landing-claude .gt-c-faq-list {
    border-top: 1px solid var(--gt-c-line);
}
body.gt-landing-claude .gt-c-faq-item {
    border-bottom: 1px solid var(--gt-c-line);
}
body.gt-landing-claude .gt-c-faq-q {
    list-style: none;
    cursor: pointer;
    padding: 1.35rem 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--gt-c-ink);
    transition: color .15s ease;
}
body.gt-landing-claude .gt-c-faq-q::-webkit-details-marker { display: none; }
body.gt-landing-claude .gt-c-faq-q:hover { color: var(--gt-c-primary); }
body.gt-landing-claude .gt-c-faq-q-icon {
    flex: 0 0 24px;
    width: 24px; height: 24px;
    position: relative;
}
body.gt-landing-claude .gt-c-faq-q-icon::before,
body.gt-landing-claude .gt-c-faq-q-icon::after {
    content: '';
    position: absolute;
    background: var(--gt-c-mute);
    transition: transform .2s ease, background .15s ease;
    top: 50%; left: 50%;
}
body.gt-landing-claude .gt-c-faq-q-icon::before {
    width: 12px; height: 2px;
    transform: translate(-50%, -50%);
}
body.gt-landing-claude .gt-c-faq-q-icon::after {
    width: 2px; height: 12px;
    transform: translate(-50%, -50%);
}
body.gt-landing-claude .gt-c-faq-item[open] .gt-c-faq-q-icon::after {
    transform: translate(-50%, -50%) scaleY(0);
}
body.gt-landing-claude .gt-c-faq-item[open] .gt-c-faq-q-icon::before { background: var(--gt-c-primary); }
body.gt-landing-claude .gt-c-faq-a {
    color: var(--gt-c-mute);
    font-size: 1rem;
    line-height: 1.7;
    padding: 0 0 1.35rem;
    max-width: 56em;
}

/* ===== 최종 CTA ===== */
body.gt-landing-claude .gt-c-cta {
    position: relative;
    overflow: hidden;
    background: #2B3467;
    color: #fff;
    padding: 5rem 0;
}
body.gt-landing-claude .gt-c-cta-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 15% 20%, rgba(255,255,255,.18), transparent 35%),
        radial-gradient(circle at 85% 90%, rgba(0,0,0,.12), transparent 50%);
    pointer-events: none;
}
body.gt-landing-claude .gt-c-cta-eyebrow {
    display: inline-block;
    font-size: .8125rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: #fff;
    background: rgba(255,255,255,.18);
    padding: .35rem .75rem;
    border-radius: 999px;
    margin-bottom: 1.25rem;
}
body.gt-landing-claude .gt-c-cta-title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: -.02em;
    color: #fff;
    margin-bottom: 1rem;
}
body.gt-landing-claude .gt-c-cta-desc {
    color: rgba(255,255,255,.88);
    font-size: 1.0625rem;
    margin-bottom: 1.75rem;
}
body.gt-landing-claude .gt-c-btn-primary-on-dark {
    background: #fff;
    color: var(--gt-c-primary);
    border-radius: 10px;
    padding: .85rem 1.75rem;
    font-weight: 700;
    box-shadow: 0 6px 18px rgba(0, 0, 0, .15);
    border: 0;
    transition: transform .15s ease, box-shadow .15s ease;
}
body.gt-landing-claude .gt-c-btn-primary-on-dark:hover,
body.gt-landing-claude .gt-c-btn-primary-on-dark:focus {
    color: var(--gt-c-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 8px 22px rgba(0, 0, 0, .22);
}
body.gt-landing-claude .gt-c-cta .btn-outline-light {
    border-radius: 10px;
    padding: .85rem 1.5rem;
    font-weight: 600;
}

/* ===== Footer ===== */
body.gt-landing-claude .gt-c-footer {
    background: #fff;
    border-top: 1px solid var(--gt-c-line);
    padding: 2.5rem 0;
}
body.gt-landing-claude .gt-c-footer-brand {
    font-weight: 700;
    color: var(--gt-c-ink);
    margin: 0 0 .25rem;
    font-size: 1rem;
}
body.gt-landing-claude .gt-c-footer-tag {
    color: var(--gt-c-mute);
    font-size: .875rem;
    margin: 0;
}
body.gt-landing-claude .gt-c-footer-links a {
    color: var(--gt-c-mute);
    text-decoration: none;
    transition: color .15s ease;
}
body.gt-landing-claude .gt-c-footer-links a:hover { color: var(--gt-c-primary); }
body.gt-landing-claude .gt-c-footer-sep { color: var(--gt-c-line); margin: 0 .25rem; }

/* ===== 반응형 (단일 BP 768px, main.css 정책 따름) ===== */
@media (max-width: 768px) {
    body.gt-landing-claude .gt-c-section { padding: 3.5rem 0; }
    body.gt-landing-claude .gt-c-section-head { margin-bottom: 2.25rem; }

    body.gt-landing-claude .gt-c-hero { padding: 3rem 0 3.5rem; }
    body.gt-landing-claude .gt-c-hero-title { font-size: 1.875rem; line-height: 1.3; }
    body.gt-landing-claude .gt-c-hero-brand { font-size: 1rem; }
    body.gt-landing-claude .gt-c-hero-lead { font-size: 1.0625rem; }
    body.gt-landing-claude .gt-c-section-title { font-size: 1.625rem; }
    body.gt-landing-claude .gt-c-cta-title { font-size: 1.625rem; }

    body.gt-landing-claude .gt-c-cta-row .btn { width: 100%; }
    body.gt-landing-claude .gt-c-navbar .btn { width: 100%; margin-top: .5rem; }
    body.gt-landing-claude .gt-c-navbar .navbar-collapse .d-flex {
        flex-direction: column;
        align-items: stretch !important;
        width: 100%;
    }
    body.gt-landing-claude .gt-c-nav-links a {
        display: block;
        margin: 0 0 .5rem;
        padding: .25rem 0;
    }

    /* 탭: 가로 스크롤 */
    body.gt-landing-claude .gt-c-tab-nav {
        grid-template-columns: repeat(4, minmax(160px, 1fr));
        overflow-x: auto;
        padding-bottom: .5rem;
        -webkit-overflow-scrolling: touch;
    }
    body.gt-landing-claude .gt-c-tab-panels { padding: 1.5rem; }
    body.gt-landing-claude .gt-c-feature-title { font-size: 1.375rem; }

    /* Before/After: 세로 스택 */
    body.gt-landing-claude .gt-c-compare-header { display: none; }
    body.gt-landing-claude .gt-c-compare-row {
        grid-template-columns: 1fr;
        border-top: 1px solid var(--gt-c-line);
    }
    body.gt-landing-claude .gt-c-compare-col { padding: 1.25rem 1.25rem; }
    body.gt-landing-claude .gt-c-compare-col--before {
        background: var(--gt-c-soft);
    }
    body.gt-landing-claude .gt-c-compare-arrow {
        display: none;
    }
    body.gt-landing-claude .gt-c-compare-mobile-label {
        display: inline-block;
        font-size: .75rem;
        font-weight: 700;
        letter-spacing: .04em;
        text-transform: uppercase;
        margin-bottom: .35rem;
    }
    body.gt-landing-claude .gt-c-compare-mobile-label--before { color: var(--gt-c-mute); }
    body.gt-landing-claude .gt-c-compare-mobile-label--after  { color: var(--gt-c-primary); }
}