:root {
    --navy: #07182f;
    --navy-soft: #102c4f;
    --ink: #10233f;
    --paper: #f4f7f5;
    --white: #ffffff;
    --cyan: #56e6d6;
    --cyan-dark: #087d76;
    --lime: #d9ff63;
    --line: #cfdbd8;
    --muted: #5d6b78;
    --warning: #fff3c9;
    --warning-ink: #725500;
    --radius: 10px;
    --shadow: 0 18px 50px rgba(7, 24, 47, .09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Arial, Helvetica, sans-serif; line-height: 1.6; }
body, button, input, textarea { font-size: 16px; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 999; padding: 10px 14px; background: var(--lime); color: var(--navy); font-weight: 800; }
.skip-link:focus { top: 16px; }
.site-header { position: relative; z-index: 10; background: var(--navy); color: var(--white); border-bottom: 1px solid rgba(255,255,255,.12); }
.header-inner { min-height: 76px; width: min(1180px, calc(100% - 40px)); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 34px; }
.brand { flex: 0 0 auto; font-size: 17px; font-weight: 900; letter-spacing: .09em; }
.brand span { color: var(--lime); }
.main-nav { display: flex; align-items: center; justify-content: flex-end; gap: 27px; font-size: 14px; color: #dce9ed; }
.main-nav a { padding: 8px 0; border-bottom: 2px solid transparent; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--lime); border-color: var(--lime); }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.hero { min-height: 555px; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr); align-items: center; gap: 65px; padding-top: 70px; padding-bottom: 74px; color: var(--white); }
.hero-shell { background: var(--navy); overflow: hidden; }
.eyebrow { margin: 0 0 17px; color: var(--cyan); font-size: 12px; line-height: 1.3; font-weight: 900; letter-spacing: .16em; text-transform: uppercase; }
.eyebrow.dark { color: var(--cyan-dark); }
h1, h2, h3 { line-height: 1.12; }
h1 { max-width: 780px; margin: 0; font-size: clamp(43px, 6vw, 78px); letter-spacing: -.052em; }
h1 em { color: var(--lime); font-style: normal; }
.lead { max-width: 720px; margin: 27px 0 0; color: #cbdbe2; font-size: clamp(17px, 2vw, 20px); line-height: 1.65; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 31px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: center; padding: 0 23px; border: 1px solid currentColor; border-radius: 8px; font-weight: 900; transition: transform .18s, background .18s, border-color .18s; }
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--lime); border-color: var(--lime); color: var(--navy); }
.button-outline { color: var(--white); border-color: rgba(255,255,255,.35); }
.button-outline:hover { color: var(--cyan); border-color: var(--cyan); }
.button-dark { background: var(--navy); border-color: var(--navy); color: var(--white); }
.free-note { margin: 23px 0 0; color: #9fb2bb; font-size: 13px; }
.free-note span { color: var(--cyan); }
.hero-mark { aspect-ratio: 1; position: relative; display: flex; align-items: center; justify-content: center; border: 1px solid rgba(86,230,214,.45); border-radius: 50%; }
.hero-mark::before { content: ""; position: absolute; inset: 12%; border: 1px solid rgba(255,255,255,.13); border-radius: 50%; }
.hero-mark strong { color: var(--lime); font-size: clamp(76px, 11vw, 145px); line-height: 1; letter-spacing: -.09em; }
.mark-label, .mark-year { position: absolute; color: #a8bbc4; font-size: 11px; line-height: 1.4; letter-spacing: .12em; text-transform: uppercase; }
.mark-label { top: 14%; left: 7%; }
.mark-year { right: 2%; bottom: 17%; }
.section { padding: 80px 0; }
.section-white { background: var(--white); }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 28px; margin-bottom: 33px; }
h2 { margin: 0; font-size: clamp(31px, 4vw, 49px); letter-spacing: -.035em; }
.status-pill, .tag { display: inline-flex; align-items: center; padding: 8px 12px; border: 1px solid #9eb5b0; border-radius: 999px; color: #47635f; font-size: 12px; line-height: 1; white-space: nowrap; }
.test-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.test-card { min-height: 276px; display: flex; flex-direction: column; padding: 27px; background: var(--white); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: transform .18s, background .18s, box-shadow .18s; }
.test-card:hover { position: relative; z-index: 1; transform: translateY(-3px); background: #fbffef; box-shadow: var(--shadow); }
.card-number { color: #7d908d; font: 12px/1 monospace; }
.test-card h2, .test-card h3 { margin: 40px 0 11px; font-size: 22px; letter-spacing: -.02em; }
.test-card p { margin: 0; color: var(--muted); font-size: 15px; }
.card-link { margin-top: auto; padding-top: 22px; color: var(--cyan-dark); font-size: 13px; font-weight: 900; }
.card-link b { float: right; font-size: 18px; }
.info-band { background: #0c6f69; color: var(--white); }
.info-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 86px; padding-top: 78px; padding-bottom: 78px; }
.info-copy { color: #daf1ee; font-size: 17px; line-height: 1.78; }
.info-copy p:first-child { margin-top: 0; }
.timeline { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 42px; border-top: 2px solid var(--ink); }
.timeline article { padding: 24px 28px 0 0; }
.timeline time { display: inline-block; margin-top: -15px; padding: 7px 11px; background: var(--ink); color: var(--white); border-radius: 4px; font-size: 12px; font-weight: 900; }
.timeline h3 { margin: 25px 0 8px; font-size: 20px; }
.timeline p { margin: 0; color: var(--muted); }
.page-hero { padding: 64px 0 58px; background: var(--navy); color: var(--white); }
.page-hero h1 { max-width: 900px; font-size: clamp(39px, 5vw, 64px); }
.page-hero p:not(.eyebrow) { max-width: 770px; margin: 22px 0 0; color: #cbdbe2; font-size: 18px; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 58px; padding-top: 62px; padding-bottom: 78px; }
.article { max-width: 800px; }
.article h2 { margin: 48px 0 17px; font-size: clamp(27px, 3vw, 38px); }
.article h2:first-child { margin-top: 0; }
.article h3 { margin: 31px 0 10px; font-size: 21px; }
.article p, .article li { color: #35495a; }
.article p { margin: 0 0 19px; }
.article ul, .article ol { padding-left: 22px; }
.article li { margin-bottom: 10px; }
.article a { color: #06756e; text-decoration: underline; text-underline-offset: 3px; }
.sidebar-card, .notice, .content-card { padding: 24px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.sidebar-card { position: sticky; top: 22px; }
.sidebar-card h2 { margin: 0 0 15px; font-size: 20px; }
.sidebar-card a { display: block; padding: 10px 0; color: #315064; border-bottom: 1px solid #e4ecea; font-size: 14px; }
.sidebar-card a:last-child { border: 0; }
.notice { margin: 25px 0; background: var(--warning); border-color: #edd885; color: var(--warning-ink); }
.notice strong { display: block; margin-bottom: 6px; }
.fact-grid, .link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin: 25px 0; }
.content-card h3 { margin-top: 0; }
.content-card p:last-child { margin-bottom: 0; }
.breadcrumb { margin-bottom: 20px; color: #9fb2bb; font-size: 13px; }
.breadcrumb a { color: var(--cyan); }
.placeholder-box { padding: 46px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); text-align: center; }
.placeholder-icon { width: 62px; height: 62px; display: inline-flex; align-items: center; justify-content: center; margin-bottom: 17px; background: var(--navy); color: var(--lime); border-radius: 50%; font-size: 25px; font-weight: 900; }
.placeholder-box h2 { font-size: 32px; }
.placeholder-box p { max-width: 650px; margin: 16px auto 0; color: var(--muted); }
.placeholder-box .button { margin-top: 25px; }
.source-list { padding: 0; list-style: none; }
.source-list li { padding: 21px 0; border-bottom: 1px solid var(--line); }
.source-list strong { display: block; color: var(--ink); }
.source-list a { word-break: break-word; }
.faq-list details { margin-bottom: 12px; padding: 19px 21px; background: var(--white); border: 1px solid var(--line); border-radius: 8px; }
.faq-list summary { cursor: pointer; font-weight: 900; }
.faq-list details p { margin: 14px 0 0; }
.study-panel { margin-top: 34px; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; padding: 39px; background: var(--navy); color: var(--white); border-radius: var(--radius); }
.study-panel h2 { font-size: clamp(28px, 3vw, 38px); }
.study-panel p:not(.eyebrow) { margin: 18px 0 0; color: #cbdbe2; }
.study-steps { margin: 0; padding: 0; list-style: none; }
.study-steps li { display: flex; align-items: center; gap: 13px; padding: 15px 0; border-bottom: 1px solid rgba(255,255,255,.14); color: #eaf2f4; }
.study-steps li:last-child { border-bottom: 0; }
.study-steps span { width: 30px; height: 30px; flex: 0 0 30px; display: inline-flex; align-items: center; justify-content: center; background: var(--lime); color: var(--navy); border-radius: 50%; font-size: 12px; font-weight: 900; }
.category-actions { display: flex; align-items: center; gap: 24px; margin-top: 28px; }
.text-link { color: var(--cyan-dark); font-weight: 900; }
.text-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.site-footer { padding: 47px 0 0; background: var(--navy); color: #9fb2bb; }
.footer-grid { width: min(1180px, calc(100% - 40px)); margin: 0 auto; display: grid; grid-template-columns: 1.5fr repeat(3, 1fr); gap: 43px; }
.footer-brand { color: var(--white); }
.footer-note { max-width: 260px; font-size: 13px; }
.site-footer h2 { margin: 0 0 14px; color: var(--white); font-size: 14px; letter-spacing: 0; }
.site-footer a:not(.brand) { display: block; margin: 8px 0; font-size: 13px; }
.site-footer a:hover { color: var(--lime); }
.footer-bottom { width: min(1180px, calc(100% - 40px)); margin: 38px auto 0; display: flex; justify-content: space-between; gap: 30px; padding: 21px 0; border-top: 1px solid rgba(255,255,255,.12); font-size: 12px; }
.footer-bottom p { margin: 0; }
.error-page { min-height: 62vh; display: flex; align-items: center; }
.error-code { color: var(--cyan-dark); font-size: 13px; font-weight: 900; letter-spacing: .15em; }

@media (max-width: 900px) {
    .header-inner { align-items: flex-start; flex-direction: column; padding-top: 19px; padding-bottom: 18px; }
    .main-nav { width: 100%; justify-content: flex-start; gap: 20px; overflow-x: auto; }
    .hero { grid-template-columns: 1fr; }
    .hero-mark { width: min(410px, 88vw); justify-self: center; }
    .test-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .info-grid { grid-template-columns: 1fr; gap: 30px; }
    .content-layout { grid-template-columns: 1fr; }
    .sidebar-card { position: static; }
    .study-panel { grid-template-columns: 1fr; gap: 24px; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
    .container, .header-inner, .footer-grid, .footer-bottom { width: min(100% - 28px, 1180px); }
    .main-nav { gap: 16px; padding-bottom: 2px; }
    .hero { min-height: auto; padding-top: 52px; padding-bottom: 57px; }
    .hero-mark { display: none; }
    .section { padding: 58px 0; }
    .section-heading { align-items: flex-start; flex-direction: column; }
    .test-grid, .fact-grid, .link-grid { grid-template-columns: 1fr; }
    .timeline { grid-template-columns: 1fr; gap: 35px; }
    .page-hero { padding: 48px 0 43px; }
    .content-layout { padding-top: 42px; padding-bottom: 58px; }
    .placeholder-box { padding: 34px 20px; }
    .study-panel { padding: 28px 21px; }
    .category-actions { align-items: flex-start; flex-direction: column; }
    .footer-grid { grid-template-columns: 1fr; gap: 27px; }
    .footer-bottom { align-items: flex-start; flex-direction: column; }
}