:root { color-scheme: dark; --bg: #050c17; --panel: #0b1728; --text: #eff5fc; --muted: #acbacd; --line: #26354a; --accent: #53efd1; }
* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; scroll-padding-top: 110px; }
body { margin: 0; color: var(--text); background: radial-gradient(ellipse at 80% 5%, #12343c66, transparent 36%), var(--bg); font: 17px/1.75 Inter, "Segoe UI", system-ui, sans-serif; }
a { color: var(--accent); text-underline-offset: 4px; }
a:hover { color: #c6fff4; }
button, input { font: inherit; }
img { max-width: 100%; height: auto; }
:focus-visible { outline: 3px solid #84ffe5; outline-offset: 5px; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 10; background: var(--accent); color: #041515; padding: 10px 18px; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 5; background: #050c17f2; border-bottom: 1px solid var(--line); backdrop-filter: blur(16px); }
.header-inner, .page-wrap, .footer-inner { width: min(1180px, calc(100% - 64px)); margin: auto; }
.header-inner { min-height: 86px; display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.brand { display: flex; align-items: center; gap: 9px; color: var(--text); text-decoration: none; white-space: nowrap; }
.brand img { width: 132px; height: auto; }
.site-header nav { display: flex; gap: 27px; align-items: center; font-size: 14px; }
.site-header nav a { text-decoration: none; color: var(--muted); }
.site-header nav [aria-current] { color: var(--accent); }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 22px; min-height: 49px; padding: 12px 21px; border: 1px solid var(--accent); border-radius: 9px; background: var(--accent); color: #03241e; text-decoration: none; cursor: pointer; font-size: 14px; line-height: 1.4; font-weight: 750; }
.button:hover { background: #9fffe9; color: #03241e; }
.site-header nav .button { color: #03241e; }
.button-small { min-height: 41px; padding: 10px 15px; }
.button:disabled { cursor: wait; opacity: .65; }
.eyebrow { display: block; color: var(--accent); font-size: 11px; font-weight: 750; letter-spacing: .15em; text-transform: uppercase; }
.accent-dot { display: inline-block; height: 7px; width: 7px; margin-right: 9px; border-radius: 50%; background: var(--accent); }
.learn-hero { padding: 92px 0 62px; }
.learn-hero h1 { margin: 22px 0; max-width: 1000px; font-size: clamp(40px, 5.8vw, 72px); line-height: 1.08; letter-spacing: -.055em; font-weight: 740; }
.learn-hero h1 span { color: #9aafc7; }
.learn-hero > p { max-width: 670px; color: var(--muted); font-size: 19px; }
.hero-footnote { display: flex; flex-wrap: wrap; gap: 12px 27px; margin-top: 30px; color: #d1dce9; font-size: 12px; }
.hero-footnote span::before { content: "＋"; margin-right: 8px; color: var(--accent); }
.guide-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.guide-card { position: relative; display: flex; flex-direction: column; padding: 32px; min-width: 0; border: 1px solid var(--line); border-radius: 17px; background: linear-gradient(160deg, #112337, #0a1423); color: var(--text); text-decoration: none; transition: border-color .2s, transform .2s; }
.guide-card:hover { transform: translateY(-4px); border-color: var(--accent); color: var(--text); }
.guide-number { color: #71839c; font-size: 12px; margin-bottom: 47px; }
.guide-card h2 { margin: 15px 0; font-size: 23px; letter-spacing: -.025em; line-height: 1.3; }
.guide-card p { margin: 0 0 35px; color: var(--muted); font-size: 15px; line-height: 1.65; }
.card-bottom { display: flex; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 18px; border-top: 1px solid var(--line); color: #c0ccdc; font-size: 12px; }
.card-bottom span { color: var(--accent); font-size: 24px; }
.learning-note { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; padding: 75px 0; margin-top: 20px; }
.learning-note h2, .related > h2 { margin: 15px 0; font-size: 35px; line-height: 1.18; letter-spacing: -.04em; }
.learning-note p { margin: 0; color: var(--muted); }
.learning-note a { display: inline-block; margin-top: 10px; }
.breadcrumbs { display: flex; gap: 13px; flex-wrap: wrap; padding-top: 33px; color: #94a6bf; font-size: 12px; }
.breadcrumbs a { color: #bdcbdc; text-decoration: none; }
.article-header { max-width: 970px; padding: 45px 0 47px; }
.article-header h1 { margin: 20px 0; font-size: clamp(34px, 4.5vw, 57px); line-height: 1.12; letter-spacing: -.045em; }
.article-deck { max-width: 730px; margin: 20px 0; color: var(--muted); font-size: 20px; line-height: 1.6; }
.byline { display: flex; gap: 8px 12px; flex-wrap: wrap; align-items: baseline; color: #acbad0; font-size: 12px; }
.reading-layout { display: grid; grid-template-columns: 245px minmax(0, 760px); gap: 65px; align-items: start; }
.contents { position: sticky; top: 114px; border-top: 1px solid var(--line); padding-top: 20px; }
.contents h2 { margin: 0 0 17px; color: #d4e0ef; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; }
.contents a { display: block; margin: 0 0 14px; font-size: 13px; line-height: 1.5; color: #a7b8ce; text-decoration: none; }
.contents a:hover { color: var(--accent); }
.article-body { min-width: 0; color: #c4d0e1; }
.quick-answer { padding: 28px 30px; border: 1px solid #27594f; border-left: 3px solid var(--accent); border-radius: 0 13px 13px 0; background: #0b272780; }
.quick-answer p { margin: 13px 0 0; color: #e3f2f3; font-size: 18px; line-height: 1.8; }
.article-section { margin-top: 45px; }
.article-section h2 { color: var(--text); font-size: 28px; line-height: 1.3; letter-spacing: -.025em; margin: 0 0 21px; }
.article-body p { margin-top: 0; margin-bottom: 21px; }
.article-body strong { color: #edf5fd; }
.article-body ul, .article-body ol { padding-left: 23px; }
.article-body li { margin: 12px 0; padding-left: 5px; }
.table-scroll { max-width: 100%; overflow-x: auto; margin: 27px 0; border: 1px solid var(--line); border-radius: 11px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; line-height: 1.65; }
caption { padding: 15px 17px; background: #132538; color: #d5e4f2; text-align: left; font-size: 12px; }
th, td { padding: 17px; text-align: left; vertical-align: top; border-top: 1px solid var(--line); }
thead th { background: #0d1b2d; color: #d5e4f2; }
tbody th { color: #d8f7f0; font-weight: 600; min-width: 110px; }
.callout { margin: 27px 0; padding: 24px; background: #121f31; border: 1px solid #35475d; border-radius: 11px; }
.callout > strong { display: block; margin-bottom: 10px; }
.callout p:last-child { margin-bottom: 0; }
.chart-figure { margin: 27px 0; }
.chart-viewport { max-width: 100%; overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; }
.chart-figure img { width: 100%; min-width: 680px; max-width: none; display: block; }
figcaption { margin: 11px 0; font-size: 12px; color: #a3b3c9; }
.checklist { padding: 8px 23px; border: 1px solid var(--line); border-radius: 13px; background: var(--panel); }
.checklist label { display: flex; align-items: flex-start; gap: 13px; padding: 14px 0; border-bottom: 1px solid var(--line); cursor: pointer; font-size: 15px; }
.checklist label:last-child { border: 0; }
.checklist input { margin-top: 6px; width: 18px; height: 18px; flex: 0 0 18px; accent-color: var(--accent); }
.questions details { border-bottom: 1px solid var(--line); }
.questions summary { padding: 18px 0; cursor: pointer; color: #e2edf9; font-size: 16px; font-weight: 600; }
.questions details p { padding-top: 5px; }
.sources { margin-bottom: 50px; padding-top: 28px; border-top: 1px solid var(--line); font-size: 13px; }
.sources h2 { font-size: 21px; }
.sources a { overflow-wrap: anywhere; }
.article-cta { display: grid; grid-template-columns: 1fr 300px; gap: 45px; align-items: center; margin: 50px 0 60px; padding: 43px; border: 1px solid #2b5a54; border-radius: 18px; background: radial-gradient(ellipse at 0 0, #16514666, transparent 70%), #0b1a28; }
.article-cta h2 { font-size: 37px; line-height: 1.2; letter-spacing: -.035em; margin: 13px 0; }
.article-cta p { margin: 0; color: #b6c6d8; font-size: 15px; }
.cta-actions { display: grid; justify-items: start; gap: 14px; }
.cta-actions > p { font-size: 11px; }
.text-link { font-size: 13px; }
.guest-status:empty { display: none; }
.guest-status { color: #ffd49e !important; }
.related { margin: 0 0 85px; }
.related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: 27px; }
.related-grid .guide-number { margin-bottom: 20px; }
.site-footer { border-top: 1px solid var(--line); background: #040b14; padding: 40px 0; }
.footer-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.footer-name { font-weight: 700; color: #e1ecf9; text-decoration: none; }
.footer-inner p { font-size: 12px; color: #9aabc3; margin: 7px 0 0; }
.footer-inner nav { display: flex; justify-content: end; align-items: start; flex-wrap: wrap; gap: 13px 23px; }
.footer-inner nav a { color: #b4c4d8; font-size: 12px; }
.footer-inner .fine-print { grid-column: 1 / -1; font-size: 11px; }
.narrow { max-width: 850px; }
.narrow .article-cta { grid-template-columns: 1fr; }
@media (max-width: 1000px) { .reading-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 35px; } .guide-card { padding: 24px; } .guide-card h2 { font-size: 21px; } }
@media (max-width: 780px) { .header-inner, .page-wrap, .footer-inner { width: calc(100% - 36px); } .guide-grid { grid-template-columns: 1fr; } .guide-number { margin-bottom: 22px; } .guide-card h2 { max-width: 550px; } .learning-note { grid-template-columns: 1fr; gap: 20px; padding: 50px 0; } .reading-layout { display: block; } .contents { position: static; margin-bottom: 30px; padding: 20px; border: 1px solid var(--line); border-radius: 12px; } .contents nav { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; } .contents h2 { grid-column: 1 / -1; } .article-cta { grid-template-columns: 1fr; padding: 30px; gap: 24px; } .footer-inner { grid-template-columns: 1fr; } .footer-inner nav { justify-content: start; } .article-header { padding: 35px 0; } }
@media (max-width: 540px) { body { font-size: 16px; } .header-inner { flex-wrap: wrap; padding: 15px 0 12px; gap: 14px; } .site-header { position: static; } .site-header nav { width: 100%; justify-content: space-between; gap: 12px; font-size: 12px; } .brand img { width: 118px; } .button-small { min-height: 36px; padding: 8px 12px; font-size: 12px; } .learn-hero { padding: 51px 0 35px; } .learn-hero > p { font-size: 17px; } .eyebrow { font-size: 10px; letter-spacing: .1em; } .article-deck { font-size: 18px; } .quick-answer { padding: 22px; } .quick-answer p { font-size: 16px; } .article-section h2 { font-size: 25px; } .article-cta h2 { font-size: 31px; } .article-cta { padding: 25px; } .contents nav { display: block; } th, td { padding: 12px; } table { font-size: 13px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .guide-card { transition: none; } .guide-card:hover { transform: none; } }
@media print { :root { color-scheme: light; } body, .article-body, .quick-answer, .article-body strong, .article-section h2, .article-header h1 { background: white; color: black; } a { color: black; } .site-header, .contents, .article-cta, .related, .site-footer { display: none; } .page-wrap { width: 100%; } .reading-layout { display: block; } .article-section { break-inside: avoid; } }