:root {
      --blue-1: #A1DAE9;
      --blue-2: #53B1E4;
      --blue-3: #2769BD;
      --blue-4: #20277E;
      --navy: #1E3A5F;
      --bg: #F5F7FA;
      --white: #FFFFFF;
      --text: #262626;
      --text-sub: #5C6370;
      --text-muted: #666666;
      --divider: #E5E7EB;
    }
    *, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body { font-family: Pretendard, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; line-height: 1.6; color: var(--text); background: var(--white); word-break: keep-all; }

    /* === HEADER === */
    header { position: sticky; top: 0; height: 80px; border-bottom: 1px solid var(--divider); display: flex; align-items: center; justify-content: space-between; padding: 0 max(48px, calc((100% - 1200px)/2)); z-index: 100; backdrop-filter: blur(12px); background: rgba(255,255,255,0.97); }
    .hdr-left, .hdr-right { flex-shrink: 0; }
    .hdr-center { position: absolute; left: 50%; transform: translateX(-50%); }
    .logo { display: flex; align-items: center; text-decoration: none; }
    .logo img { height: 44px !important; width: auto !important; }
    nav { display: flex; gap: 36px; }
    nav a { color: var(--text); text-decoration: none; font-size: 17px; font-weight: 600; transition: color .2s; letter-spacing: -.01em; }
    nav a:hover { color: var(--blue-3); }
    .hdr-cta { padding: 12px 28px; border-radius: 8px; font-size: 16px; font-weight: 700; background: var(--blue-3); color: var(--white); text-decoration: none; transition: all .2s; }
    .hdr-cta:hover { background: #1e5aaa; box-shadow: 0 4px 12px rgba(39,105,189,.25); }
    .hdr-burger { display: none; }
    .mobile-menu { display: none; }

    /* === LAYOUT === */
    .inner { max-width: 1200px; margin: 0 auto; }
    section { padding: 96px 48px; }
    .bg-light { background: var(--bg); }
    .bg-white { background: var(--white); }
    .bg-navy { background: var(--navy); color: var(--white); }

    .section-label { display: inline-block; background: rgba(39,105,189,.1); color: var(--blue-3); padding: 6px 14px; border-radius: 20px; font-size: 13px; font-weight: 600; margin-bottom: 16px; letter-spacing: .3px; }
    h2 { font-size: 36px; font-weight: 700; line-height: 1.35; margin-bottom: 16px; }
    .sub { font-size: 17px; color: var(--text-sub); line-height: 1.7; max-width: 640px; }
    .mock-cap { display: block; text-align: center; margin-top: 10px; font-size: 12px; color: #8899AA; }

    /* === BUTTONS === */
    .btn { padding: 14px 32px; border-radius: 8px; font-size: 16px; font-weight: 600; border: none; cursor: pointer; text-decoration: none; display: inline-block; transition: all .2s; }
    .btn-p { background: var(--blue-3); color: var(--white); }
    .btn-p:hover { background: #1e5aaa; transform: translateY(-2px); box-shadow: 0 4px 12px rgba(39,105,189,.25); }
    .btn-o { background: transparent; color: var(--white); border: 1.5px solid rgba(255,255,255,.5); }
    .btn-o:hover { background: rgba(255,255,255,.15); }

    /* === FEATURE ROW (Somnoware pattern) === */
    .feat { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
    .feat.rev { direction: rtl; }
    .feat.rev > * { direction: ltr; }
    .feat-text h2 { font-size: 32px; }
    .feat-text .sub { margin-top: 16px; }
    .feat-img { position: relative; }
    .feat-img img { width: 100%; border-radius: 12px; box-shadow: 0 8px 32px rgba(0,0,0,.1); display: block; }

    /* === HERO === */
    .hero { padding: 112px 48px 96px; }
    .hero .inner { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
    .hero h1 { font-size: 38px; font-weight: 800; line-height: 1.4; margin-bottom: 20px; letter-spacing: -.02em; }
    .hero .hsub { font-size: 16px; color: #C8D0D8; line-height: 1.8; margin-bottom: 24px; max-width: 520px; }
    .hero .mission { font-size: 16px; color: rgba(255,255,255,.65); font-weight: 500; margin-bottom: 28px; }
    .hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
    .hero-img img { width: 100%; border-radius: 12px; box-shadow: 0 20px 60px rgba(0,0,0,.3); display: block; }

    /* === SOCIAL PROOF === */
    .social-proof { background: var(--bg); padding: 20px 48px; }
    .social-proof .inner { display: flex; align-items: center; justify-content: center; gap: 40px; flex-wrap: wrap; }
    .sp-item { font-size: 15px; font-weight: 500; color: var(--text-muted); }
    .sp-div { width: 1px; height: 18px; background: #D0D0D0; }

    /* === PROBLEM === */
    .problem-list { border-left: 3px solid var(--divider); padding-left: 24px; margin: 24px 0 32px; }
    .problem-list p { font-size: 15px; color: var(--text-sub); line-height: 1.8; margin-bottom: 4px; }
    .problem-end { font-size: 17px; font-weight: 600; color: var(--blue-3); line-height: 1.7; }

    /* === PLATFORM OVERVIEW === */
    .plat-img { max-width: 960px; margin: 40px auto 0; }
    .plat-img img { width: 100%; border-radius: 12px; box-shadow: 0 8px 32px rgba(0,0,0,.06); }
    .plat-spokes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
    .plat-spoke { background: var(--white); padding: 24px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,.05); text-decoration: none; color: inherit; transition: all .2s; }
    .plat-spoke:hover { box-shadow: 0 8px 24px rgba(0,0,0,.1); transform: translateY(-4px); }
    .plat-spoke h3 { font-size: 17px; font-weight: 700; color: var(--blue-3); margin-bottom: 6px; }
    .plat-spoke p { font-size: 14px; color: var(--text-sub); line-height: 1.5; }

    /* === TIER FLOW === */
    .tiers { display: flex; gap: 16px; margin-top: 24px; }
    .tier { flex: 1; padding: 16px; border-radius: 8px; background: var(--bg); border-left: 3px solid; }
    .tier.t1 { border-color: var(--blue-1); }
    .tier.t2 { border-color: var(--blue-2); }
    .tier.t3 { border-color: var(--blue-3); }
    .tier-name { font-size: 12px; font-weight: 700; color: var(--text-muted); margin-bottom: 4px; }
    .tier-act { font-size: 14px; font-weight: 600; color: var(--text); }

    /* === PORTAL FEATURES (Somnoware alternating rows) === */
    .portal-rows { display: flex; flex-direction: column; gap: 72px; margin-top: 56px; }

    /* === TRUST ACCORDION === */
    .accordion { margin-top: 40px; display: flex; flex-direction: column; gap: 6px; }
    .acc-item { border-radius: 8px; overflow: hidden; background: var(--bg); }
    .acc-hdr { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; cursor: pointer; user-select: none; }
    .acc-hdr:hover { background: #EDF0F4; }
    .acc-hdr h3 { font-size: 17px; font-weight: 600; margin: 0; }
    .acc-icon { font-size: 18px; color: var(--text-muted); transition: transform .3s; }
    .acc-item.open .acc-icon { transform: rotate(180deg); }
    .acc-body { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
    .acc-item.open .acc-body { max-height: 3000px; }
    .acc-inner { padding: 0 24px 24px; }
    .acc-inner h4 { font-size: 15px; font-weight: 700; margin: 16px 0 6px; color: var(--text); }
    .acc-inner p { font-size: 14px; color: var(--text-sub); line-height: 1.7; margin-bottom: 8px; }
    .acc-inner .hl { color: var(--blue-3); font-weight: 600; }
    /* 3-step verification visual */
    .verify-steps { display: flex; gap: 16px; margin: 16px 0; }
    .v-step { flex: 1; background: var(--white); border-radius: 8px; padding: 16px; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
    .v-step-num { font-size: 12px; font-weight: 700; color: var(--blue-3); margin-bottom: 4px; }
    .v-step-title { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
    .v-step-desc { font-size: 13px; color: var(--text-sub); line-height: 1.5; }
    /* evidence levels visual */
    .ev-levels { display: flex; flex-direction: column; gap: 8px; margin: 16px 0; }
    .ev-lv { display: flex; align-items: center; gap: 12px; padding: 10px 16px; border-radius: 6px; background: var(--white); }
    .ev-badge { font-size: 13px; font-weight: 700; padding: 4px 10px; border-radius: 4px; flex-shrink: 0; min-width: 60px; text-align: center; }
    .ev-badge.a { background: #DBEAFE; color: #1D4ED8; }
    .ev-badge.b { background: #D1FAE5; color: #065F46; }
    .ev-badge.c { background: #FEF3C7; color: #92400E; }
    .ev-badge.r { background: #E0E7FF; color: #3730A3; }
    .ev-text { font-size: 13px; color: var(--text-sub); }
    /* security layers visual */
    .sec-layers { display: flex; flex-direction: column; gap: 8px; margin: 16px 0; }
    .sec-layer { display: flex; align-items: flex-start; gap: 16px; padding: 16px; border-radius: 8px; background: var(--white); }
    .sec-layer-icon { font-size: 24px; flex-shrink: 0; width: 40px; text-align: center; }
    .sec-layer-title { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 2px; }
    .sec-layer-desc { font-size: 13px; color: var(--text-sub); line-height: 1.5; }
    /* NHI table */
    .nhi-table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 13px; }
    .nhi-table th { text-align: left; padding: 8px 12px; background: var(--white); font-weight: 600; color: var(--text); border-bottom: 2px solid var(--divider); }
    .nhi-table td { padding: 8px 12px; border-bottom: 1px solid var(--divider); color: var(--text-sub); }

    /* === ROI SIMULATOR === */
    .roi-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 40px; }
    .roi-panel { background: var(--white); border-radius: 12px; padding: 36px; box-shadow: 0 2px 8px rgba(0,0,0,.05); }
    .roi-panel h3 { font-size: 18px; font-weight: 700; margin-bottom: 28px; }
    .roi-field { margin-bottom: 24px; }
    .roi-field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 10px; }
    .roi-val { font-size: 28px; font-weight: 800; color: var(--text); margin-bottom: 8px; }
    .roi-val span { font-size: 16px; font-weight: 400; color: var(--text-muted); }
    input[type=range] { -webkit-appearance: none; width: 100%; height: 6px; border-radius: 3px; background: var(--divider); outline: none; }
    input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%; background: var(--blue-3); cursor: pointer; box-shadow: 0 2px 8px rgba(39,105,189,.3); }
    input[type=range]::-moz-range-thumb { width: 20px; height: 20px; border-radius: 50%; background: var(--blue-3); cursor: pointer; border: none; }
    .roi-sel, .roi-inp { width: 100%; padding: 12px 16px; border: 1.5px solid var(--divider); border-radius: 8px; font-size: 16px; font-family: Pretendard, sans-serif; color: var(--text); background: var(--white); }
    .roi-sel:focus, .roi-inp:focus { outline: none; border-color: var(--blue-3); }
    .roi-block { margin-bottom: 28px; }
    .roi-block-label { font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 12px; line-height: 1.5; }
    .roi-row { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 8px; gap: 12px; }
    .roi-row-desc { font-size: 14px; color: var(--text-sub); }
    .roi-num { font-size: 24px; font-weight: 800; color: var(--blue-3); white-space: nowrap; }
    .roi-num span { font-size: 14px; font-weight: 400; color: var(--text-muted); }
    .roi-total { background: #F0F6FF; padding: 28px 36px; border-radius: 0 0 12px 12px; margin: auto -36px -36px; }
    .roi-total-label { font-size: 15px; color: var(--text); margin-bottom: 4px; }
    .roi-total-num { font-size: 44px; font-weight: 800; color: var(--blue-4); }
    .roi-total-num span { font-size: 18px; font-weight: 400; color: var(--text-muted); }
    /* demo form */
    .demo-section { margin-top: 56px; background: var(--white); border-radius: 12px; padding: 40px; box-shadow: 0 2px 8px rgba(0,0,0,.05); }
    .demo-copy { font-size: 16px; color: var(--text-sub); line-height: 1.7; margin-bottom: 28px; }
    .demo-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .demo-form .fw { grid-column: 1 / -1; }
    .demo-form input { width: 100%; padding: 14px 16px; border: 1.5px solid var(--divider); border-radius: 8px; font-size: 16px; font-family: Pretendard, sans-serif; color: var(--text); }
    .demo-form input:focus { outline: none; border-color: var(--blue-3); }
    .demo-submit { grid-column: 1 / -1; width: 100%; padding: 16px; background: var(--blue-3); color: var(--white); border: none; border-radius: 8px; font-size: 18px; font-weight: 600; font-family: Pretendard, sans-serif; cursor: pointer; height: 56px; transition: all .2s; }
    .demo-submit:hover { background: #1e5aaa; }
    .demo-contact { margin-top: 20px; text-align: center; font-size: 14px; color: var(--text-muted); display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }
    .demo-contact a { color: var(--text-muted); text-decoration: none; }
    .demo-contact a:hover { color: var(--blue-3); }

    /* === FOOTER === */
    footer { background: var(--text); color: var(--white); padding: 56px 48px 32px; }
    footer a { color: #B0B0B0; text-decoration: none; transition: color .2s; }
    footer a:visited { color: #B0B0B0; }
    footer a:hover { color: var(--white); }
    footer ul { list-style: none; padding: 0; margin: 0; }
    .ft-inner { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; }
    .ft-brand { display: flex; flex-direction: column; gap: 16px; }
    .ft-logo { display: flex; }
    .ft-tagline { font-size: 14px; color: #B0B0B0; line-height: 1.6; }
    .ft-info { font-size: 13px; color: #909090; line-height: 1.8; }
    .ft-social { display: flex; gap: 12px; margin-top: 4px; }
    .ft-social a { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,.1); color: #B0B0B0; text-decoration: none; transition: all .2s; }
    .ft-social a:hover { background: rgba(255,255,255,.2); color: var(--white); }
    .ft-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
    .ft-nav-group h4 { font-size: 14px; font-weight: 700; color: var(--white); margin: 0 0 14px; }
    .ft-nav-group ul { display: flex; flex-direction: column; gap: 10px; }
    .ft-nav-group a { font-size: 13px; }
    .ft-contact { display: flex; flex-direction: column; gap: 10px; font-size: 13px; }
    .ft-contact a { display: inline-flex; align-items: center; gap: 6px; }
    .ft-contact svg { flex-shrink: 0; opacity: .7; }
    .ft-contact a:hover svg { opacity: 1; }
    .ft-bottom { max-width: 1100px; margin: 32px auto 0; color: #707070; font-size: 12px; border-top: 1px solid rgba(255,255,255,.08); padding-top: 20px; text-align: center; }

    /* === FAQ === */
    .faq-cats { display: flex; flex-direction: column; gap: 48px; margin-top: 48px; }
    .faq-cat-title { font-size: 20px; font-weight: 700; color: var(--blue-3); margin-bottom: 24px; padding-bottom: 12px; border-bottom: 2px solid var(--blue-3); }
    .faq-item { margin-bottom: 8px; border-radius: 8px; background: var(--bg); overflow: hidden; }
    .faq-q { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; cursor: pointer; user-select: none; gap: 16px; }
    .faq-q:hover { background: #EDF0F4; }
    .faq-q h3 { font-size: 16px; font-weight: 600; margin: 0; color: var(--text); flex: 1; }
    .faq-q .faq-icon { font-size: 16px; color: var(--text-muted); transition: transform .3s; flex-shrink: 0; }
    .faq-item.open .faq-icon { transform: rotate(180deg); }
    .faq-a { max-height: 0; overflow: hidden; transition: max-height .4s ease; }
    .faq-item.open .faq-a { max-height: 2000px; }
    .faq-a-inner { padding: 0 24px 20px; font-size: 15px; color: var(--text-sub); line-height: 1.8; }

    /* Page hero (smaller, for sub-pages) */
    .page-hero { background: var(--navy); color: var(--white); padding: 96px 48px 72px; }
    .page-hero h1 { font-size: 36px; font-weight: 800; line-height: 1.35; margin-bottom: 16px; }
    .page-hero .sub { color: #C8D0D8; }
    .page-hero .section-label { background: rgba(255,255,255,.15); color: #FFFFFF; }

    /* === RESPONSIVE === */
    @media (max-width: 1024px) {
      header { padding: 0 24px; }
      section { padding: 72px 24px; }
      .hero { padding: 88px 24px 72px; }
      .hero .inner, .feat, .feat.rev, .roi-grid { grid-template-columns: 1fr; gap: 40px; }
      .feat.rev { direction: ltr; }
      .plat-spokes { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      header { padding: 0 16px; height: 64px; }
      .hdr-center { display: none; }
      .hdr-cta { display: none; }
      .hdr-burger { display: flex; flex-direction: column; justify-content: center; gap: 5px; width: 36px; height: 36px; padding: 6px; background: none; border: none; cursor: pointer; }
      .hdr-burger span { display: block; width: 100%; height: 2px; background: var(--text); border-radius: 1px; transition: all .3s; }
      .hdr-burger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
      .hdr-burger.open span:nth-child(2) { opacity: 0; }
      .hdr-burger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
      .mobile-menu { position: fixed; top: 64px; left: 0; right: 0; bottom: 0; background: rgba(255,255,255,0.98); transform: translateX(100%); transition: transform .3s ease; z-index: 99; display: flex; flex-direction: column; }
      .mobile-menu.open { transform: translateX(0); }
      .mobile-nav { display: flex; flex-direction: column; padding: 24px 24px 0; flex: 1; }
      .mobile-nav a { font-size: 20px; font-weight: 700; color: var(--text); text-decoration: none; padding: 16px 12px; border-bottom: 1px solid var(--divider); transition: color .2s; }
      .mobile-nav a:hover { color: var(--blue-3); }
      .mobile-nav a.active { color: var(--blue-3); border-left: 3px solid var(--blue-3); padding-left: 9px; }
      .mobile-menu-cta { padding: 24px; }
      .btn { padding: 12px 24px; font-size: 14px; }
      section { padding: 56px 16px; }
      .hero { padding: 72px 16px 56px; }
      .social-proof { padding: 16px; }
      h2 { font-size: 26px; }
      .hero h1 { font-size: 26px; }
      .hero .hsub { font-size: 14px; }
      .hero-btns { flex-direction: column; }
      .hero-btns .btn { text-align: center; }
      .social-proof .inner { flex-direction: column; gap: 6px; }
      .sp-div { display: none; }
      .sp-item { font-size: 13px; }
      .plat-spokes { grid-template-columns: 1fr; gap: 12px; }
      .plat-spoke { padding: 16px; }
      .tiers { flex-direction: column; gap: 8px; }
      .feat-text h2 { font-size: 24px; }
      .verify-steps { flex-direction: column; }
      .roi-grid { grid-template-columns: 1fr; }
      .roi-panel { padding: 24px; }
      .roi-total { margin: auto -24px -24px; padding: 24px; }
      .roi-total-num { font-size: 32px; }
      .roi-num { font-size: 20px; }
      .roi-row { flex-direction: column; gap: 2px; }
      .demo-section { padding: 24px; }
      .demo-form { grid-template-columns: 1fr; }
      .portal-rows { gap: 48px; }
      footer { padding: 40px 20px 24px; }
      .ft-inner { grid-template-columns: 1fr; gap: 28px; }
      .ft-brand { gap: 12px; }
      .ft-tagline { font-size: 13px; }
      .ft-info { font-size: 12px; line-height: 1.7; }
      .ft-nav { grid-template-columns: 1fr 1fr; gap: 20px; }
      .ft-nav-group h4 { font-size: 13px; margin-bottom: 12px; }
      .ft-nav-group a { font-size: 12px; }
      .ft-contact a { font-size: 12px; }
      .ft-bottom { margin-top: 24px; }
      .page-hero { padding: 72px 16px 48px; }
      .page-hero h1 { font-size: 26px; }
    }
    @media (max-width: 360px) {
      .ev-levels .ev-badge { display: none; }
    }