/* ==========================================================================
   서티킹 (CertKing) 토스 스타일 미니멀 랜딩 CSS (index.css)
   ========================================================================== */

:root {
    /* Brand Colors (Pure Toss Blue) */
    --brand-primary: #0064FF;
    --brand-primary-hover: #0050CC;
    --brand-primary-light: #E6F0FF;

    /* Neutral Colors */
    --neutral-white: #FFFFFF;
    --neutral-50: #F9FAFB;
    --neutral-100: #F2F4F6;
    --neutral-200: #E5E8EB;
    --neutral-300: #D1D6DB;
    --neutral-400: #B0B8C1;
    --neutral-500: #8B95A1;
    --neutral-600: #6B7684;
    --neutral-700: #4E5968;
    --neutral-800: #333D4B;
    --neutral-900: #191F28;

    /* Semantic */
    --semantic-info: #0064FF;
    --semantic-info-bg: #E6F0FF;

    /* Typography */
    --font-sans: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Border Radius */
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows (Toss uses shadows extremely sparingly) */
    --shadow-sm: 0 4px 12px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 12px 32px 0 rgba(0, 0, 0, 0.05);
    --shadow-focus: 0 0 0 4px rgba(0, 100, 255, 0.16);

    /* Animation */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ==========================================================================
   전역 레이아웃 정리 (Toss Standard)
   ========================================================================== */
body {
    background-color: var(--neutral-white);
    color: var(--neutral-800);
    font-family: var(--font-sans);
    line-height: 1.6;
    letter-spacing: 0;
    -webkit-font-smoothing: antialiased;
    word-break: keep-all;
}

html {
    scroll-behavior: smooth;
}

.page-container {
    background-color: var(--neutral-white);
    min-height: 100vh;
}

.page-container .page-wrap {
    width: 100%;
    max-width: none;
    margin: 0 auto;
    padding-top: 72px; /* GNB */
}

.main-header a:focus-visible,
.main-header button:focus-visible,
.page-wrap a:focus-visible,
.page-wrap button:focus-visible {
    outline: none;
    box-shadow: var(--shadow-focus);
}

/* ==========================================================================
   GNB 헤더 스타일 (Minimal Header)
   ========================================================================== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 72px;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--neutral-50);
    z-index: 1000;
    transition: var(--transition-fast);
}

.main-header.scrolled {
    box-shadow: var(--shadow-sm);
    border-bottom-color: var(--neutral-100);
}

.header-inner {
    max-width: 1100px;
    height: 72px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-text {
    font-size: 22px;
    font-weight: 800;
    color: var(--neutral-900);
    letter-spacing: 0;
}

.logo-highlight {
    color: var(--brand-primary);
}

/* GNB 메뉴 */
.nav-menu ul {
    display: flex;
    gap: 36px;
}

.nav-link {
    font-size: 15px;
    font-weight: 600;
    color: var(--neutral-600);
    padding: 8px 0;
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--brand-primary);
}

/* 헤더 액션 버튼 */
.user-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-login {
    font-size: 14px;
    font-weight: 600;
    color: var(--neutral-700);
    padding: 10px 18px;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.btn-login:hover {
    color: var(--neutral-900);
    background-color: var(--neutral-50);
}

.btn-signup {
    font-size: 14px;
    font-weight: 600;
    color: var(--neutral-white) !important;
    background-color: var(--brand-primary);
    padding: 10px 20px;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.btn-signup:hover {
    background-color: var(--brand-primary-hover);
}

/* 모바일 버튼 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 20px;
    height: 14px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn .bar {
    width: 100%;
    height: 2px;
    background-color: var(--neutral-800);
    transition: var(--transition-fast);
}

.mobile-menu-btn.active .bar:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}

.mobile-menu-btn.active .bar:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .bar:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -5px);
}

/* ==========================================================================
   공통 섹션 헤더 (Strict typography spacing)
   ========================================================================== */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 72px auto;
}

.section-subtitle {
    display: inline-block;
    font-size: 14px;
    font-weight: 700;
    color: var(--brand-primary);
    letter-spacing: 0;
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--neutral-900);
    line-height: 1.35;
    letter-spacing: 0;
}

/* ==========================================================================
   1. 히어로 섹션 (Toss Minimal Hero)
   ========================================================================== */
.hero-section {
    width: 100%;
    min-height: calc(100vh - 72px);
    padding: 120px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background-image:
        linear-gradient(180deg, rgba(0, 0, 0, 0.62) 0%, rgba(0, 0, 0, 0.54) 58%, rgba(0, 0, 0, 0.68) 100%),
        url('/images/index/hero-background-certification-v2.webp');
    background-size: cover;
    background-position: center;
    border-bottom: 1px solid var(--neutral-100);
}

.hero-content {
    width: 100%;
    max-width: 880px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
}

.badge-toss {
    display: inline-flex;
    background-color: rgba(255, 255, 255, 0.14);
    padding: 8px 16px;
    border-radius: var(--radius-full);
    margin-bottom: 28px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.badge-text {
    font-size: 15px;
    font-weight: 700;
    color: var(--neutral-white);
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.35;
    color: var(--neutral-white);
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    text-shadow: 0 2px 16px rgba(0, 0, 0, 0.22);
}

.highlight-blue {
    color: #8DBBFF;
}

.hero-desc {
    font-size: 20px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.84);
    margin-bottom: 44px;
    text-shadow: 0 1px 10px rgba(0, 0, 0, 0.22);
    letter-spacing: -0.01em;
}

/* 토스 시그니처 버튼 */
.btn-toss-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: var(--brand-primary);
    color: var(--neutral-white) !important;
    font-size: 18px;
    font-weight: 700;
    height: 56px;
    padding: 0 40px;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.btn-toss-primary:hover {
    background-color: var(--brand-primary-hover);
}

/* 대행사 입점용 보조 버튼 스타일 (글래스모피즘) */
.btn-toss-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--neutral-white) !important;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    font-size: 18px;
    font-weight: 700;
    height: 56px;
    padding: 0 40px;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.btn-toss-secondary:hover {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

/* 밝은 배경용 보조 버튼 스타일 */
.btn-toss-light {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: var(--neutral-100);
    color: var(--neutral-700) !important;
    font-size: 18px;
    font-weight: 700;
    height: 56px;
    padding: 0 40px;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.btn-toss-light:hover {
    background-color: var(--neutral-200);
    color: var(--neutral-900) !important;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.hero-proof-list {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin: 28px 0 0;
    padding: 0;
    color: var(--neutral-white);
}

.hero-proof-list div {
    min-width: 132px;
    padding: 14px 16px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-lg);
    background-color: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.hero-proof-list dt {
    font-size: 17px;
    font-weight: 800;
    line-height: 1.2;
}

.hero-proof-list dd {
    margin: 6px 0 0;
    font-size: 14px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.78);
    line-height: 1.4;
}

.btn-icon {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
}

/* ==========================================================================
   2. 3단계 프로세스 섹션 (step-section)
   ========================================================================== */
.step-section {
    width: 100%;
    background-color: var(--neutral-white);
    padding: 140px 24px;
    border-top: 1px solid var(--neutral-100);
}

.step-list {
    max-width: 780px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
}

/* 토스 스텝 아이템 */
.step-item {
    background-color: var(--neutral-white);
    border-radius: var(--radius-xl);
    padding: 32px;
    display: flex;
    align-items: flex-start;
    gap: 24px;
    transition: var(--transition-base);
    border: 1px solid var(--neutral-100);
}

.step-item:hover {
    background-color: var(--neutral-50);
}

.step-num-box {
    width: 92px;
    flex: 0 0 92px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 22px;
    font-weight: 800;
    color: var(--brand-primary);
    line-height: 1;
}

.step-icon {
    width: 28px;
    height: 28px;
    color: var(--neutral-400);
}

.step-content-box h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: 12px;
}

.step-content-box p {
    font-size: 16px;
    color: var(--neutral-600);
    line-height: 1.6;
}

/* ==========================================================================
   3. 안심 보장 섹션 (trust-section)
   ========================================================================== */
.trust-section {
    width: 100%;
    background-color: var(--neutral-50);
    padding: 140px 24px;
    border-top: 1px solid var(--neutral-100);
    border-bottom: 1px solid var(--neutral-100);
}

.trust-grid {
    max-width: 860px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.trust-card {
    background-color: var(--neutral-white);
    border-radius: var(--radius-xl);
    padding: 36px;
    transition: var(--transition-base);
    border: 1px solid var(--neutral-100);
}

.trust-card:hover {
    background-color: #FCFCFD;
}

.trust-icon-box {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--semantic-info-bg);
}

.trust-icon {
    width: 26px;
    height: 26px;
    color: var(--brand-primary);
}

.trust-icon-green {
    color: #00A884;
}

.trust-card h3 {
    font-size: 22px;
    font-weight: 800;
    color: var(--neutral-900);
    margin-bottom: 16px;
}

.trust-card p {
    font-size: 15px;
    color: var(--neutral-600);
    line-height: 1.65;
}

/* ==========================================================================
   4. FAQ 아코디언 섹션 (faq-section)
   ========================================================================== */
.faq-section {
    width: 100%;
    padding: 140px 24px;
    background-color: var(--neutral-white);
}

.faq-accordion {
    max-width: 780px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

.faq-item {
    border-bottom: 1px solid var(--neutral-100);
}

.faq-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 28px 8px;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}

.faq-question {
    font-size: 18px;
    font-weight: 700;
    color: var(--neutral-800);
    transition: var(--transition-fast);
}

.faq-trigger:hover .faq-question {
    color: var(--brand-primary);
}

.faq-trigger:focus-visible {
    border-radius: var(--radius-md);
}

/* 화살표 아이콘 */
.faq-icon-arrow {
    width: 20px;
    height: 20px;
    color: var(--neutral-400);
    transition: var(--transition-base);
    flex: 0 0 auto;
}

.faq-item.active .faq-icon-arrow {
    transform: rotate(180deg);
    color: var(--brand-primary);
}

/* 설명 판넬 */
.faq-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.faq-panel p {
    font-size: 15px;
    color: var(--neutral-600);
    line-height: 1.7;
    padding: 0 8px 28px 8px;
}

/* ==========================================================================
   5. 최종 CTA 섹션 (final-cta-section)
   ========================================================================== */
.final-cta-section {
    width: 100%;
    background-color: var(--neutral-white);
    padding: 160px 24px;
    text-align: center;
    border-top: 1px solid var(--neutral-100);
}

.final-cta-inner h2 {
    font-size: 44px;
    font-weight: 800;
    color: var(--neutral-900);
    line-height: 1.3;
    margin-bottom: 20px;
    letter-spacing: 0;
}

.final-cta-inner p {
    font-size: 18px;
    color: var(--neutral-600);
    margin-bottom: 48px;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* ==========================================================================
   6. 푸터 스타일 (Toss Light Footer)
   ========================================================================== */
.footer-container {
    width: 100%;
    background-color: var(--neutral-50);
    border-top: 1px solid var(--neutral-100);
    padding: 80px 24px 48px 24px;
    color: var(--neutral-500);
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 320px;
}

.brand-desc {
    font-size: 14px;
    color: var(--neutral-500);
    margin-top: 12px;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.link-group h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--neutral-700);
    margin-bottom: 16px;
}

.link-group ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.link-group a {
    font-size: 14px;
    color: var(--neutral-500) !important;
    transition: var(--transition-fast);
}

.link-group a:hover {
    color: var(--brand-primary) !important;
}

.footer-divider {
    border: none;
    border-top: 1px solid var(--neutral-200);
    margin: 0 0 32px 0;
}

.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.company-info {
    font-size: 12px;
    line-height: 1.7;
}

.company-info span {
    font-weight: 700;
    color: var(--neutral-700);
}

.disclaimer-text {
    font-size: 11px;
    color: var(--neutral-400);
    line-height: 1.6;
    background-color: var(--neutral-100);
    padding: 16px 20px;
    border-radius: var(--radius-md);
}

.disclaimer-label {
    display: inline-flex;
    align-items: center;
    height: 20px;
    padding: 0 8px;
    margin-right: 6px;
    border-radius: var(--radius-full);
    background-color: var(--neutral-white);
    color: var(--neutral-600);
    font-size: 10px;
    font-weight: 700;
}

.copyright {
    font-size: 12px;
    color: var(--neutral-400);
}

/* ==========================================================================
   반응형 줄바꿈 유틸리티 (Responsive Line-break Utility)
   ========================================================================== */
.br-pc {
    display: inline;
}
.br-mobile {
    display: none;
}

@media (max-width: 1024px) {
    .br-pc {
        display: none;
    }
    .br-mobile {
        display: inline;
    }
}

/* ==========================================================================
   7. 반응형 미디어 쿼리 (모바일 완벽 호환)
   ========================================================================== */
@media (max-width: 1024px) {
    .hero-section {
        text-align: center;
        min-height: 680px;
        padding: 96px 24px;
        background-position: center top;
    }

    .hero-content {
        max-width: 680px;
    }

    .hero-title {
        font-size: 44px;
    }

    .trust-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
    }

    .footer-top {
        flex-direction: column;
        gap: 32px;
    }

    .footer-links {
        flex-direction: column;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    /* 모바일 헤더 */
    .nav-menu, .user-actions {
        display: none;
    }

    .main-header.menu-open {
        background-color: rgba(255, 255, 255, 0.96);
        border-bottom-color: var(--neutral-100);
    }

    .main-header.menu-open .header-inner {
        position: relative;
    }

    .main-header.menu-open .nav-menu,
    .main-header.menu-open .user-actions {
        display: flex;
        position: absolute;
        left: 20px;
        right: 20px;
        z-index: 1001;
    }

    .main-header.menu-open .nav-menu {
        top: 72px;
        padding: 20px 0 16px;
        background-color: var(--neutral-white);
        border-top: 1px solid var(--neutral-100);
        border-radius: 0 0 var(--radius-xl) var(--radius-xl);
        box-shadow: var(--shadow-md);
    }

    .main-header.menu-open .nav-menu ul {
        width: 100%;
        flex-direction: column;
        gap: 2px;
    }

    .main-header.menu-open .nav-link {
        display: flex;
        padding: 14px 20px;
        color: var(--neutral-800);
    }

    .main-header.menu-open .user-actions {
        top: 266px;
        padding: 0 20px 20px;
        gap: 10px;
        background-color: var(--neutral-white);
        border-radius: 0 0 var(--radius-xl) var(--radius-xl);
        box-shadow: var(--shadow-md);
    }

    .main-header.menu-open .btn-login,
    .main-header.menu-open .btn-signup {
        flex: 1;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        height: 44px;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-title {
        font-size: 37px;
    }

    .hero-desc {
        font-size: 18px;
    }

    .hero-section,
    .step-section,
    .trust-section,
    .faq-section {
        padding-left: 20px;
        padding-right: 20px;
    }

    .hero-section {
        min-height: 620px;
        padding-top: 84px;
        padding-bottom: 84px;
        background-image:
            linear-gradient(180deg, rgba(0, 0, 0, 0.68) 0%, rgba(0, 0, 0, 0.6) 62%, rgba(0, 0, 0, 0.72) 100%),
            url('/images/index/hero-background-certification-v2.webp');
    }

    .section-header {
        margin-bottom: 48px;
    }

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

    .step-item {
        flex-direction: column;
        padding: 28px;
        gap: 16px;
    }

    .step-num-box {
        width: 100%;
        flex-basis: auto;
    }

    .trust-card {
        padding: 28px;
    }

    .faq-trigger {
        align-items: flex-start;
        gap: 16px;
        padding: 24px 0;
    }

    .faq-question {
        font-size: 16px;
        line-height: 1.5;
    }

    .final-cta-inner h2 {
        font-size: 32px;
    }

    .final-cta-inner p {
        font-size: 16px;
    }

    .hero-actions,
    .cta-actions {
        flex-direction: column;
        align-items: center;
        gap: 12px;
        width: 100%;
    }

    .hero-actions a,
    .cta-actions a {
        width: 100%;
        max-width: 320px;
    }

    .hero-proof-list {
        width: 100%;
        max-width: 320px;
        flex-direction: column;
        gap: 8px;
    }

    .hero-proof-list div {
        min-width: 0;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        padding: 12px 14px;
    }

    .hero-proof-list dd {
        margin-top: 0;
        text-align: right;
    }
}