:root {
  --ink: #142d48;
  --ink-soft: #49637c;
  --blue: #1764a3;
  --blue-deep: #103e68;
  --blue-pale: #e9f2f9;
  --blue-wash: #f3f8fc;
  --paper: #fbfcfd;
  --line: #d8e4ed;
  --mint: #dcefe9;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --sans: "Avenir Next", Avenir, "Segoe UI", sans-serif;
  --measure: 1120px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.68; }
a { color: var(--blue); text-underline-offset: 3px; }
a:hover { color: var(--blue-deep); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid #d18a46; outline-offset: 4px; border-radius: 3px; }
img, svg { max-width: 100%; }
.skip-link { position: absolute; top: -60px; left: 16px; padding: 10px 14px; background: var(--ink); color: #fff; z-index: 20; }
.skip-link:focus { top: 12px; }
.site-header { background: rgba(251,252,253,.96); border-bottom: 1px solid var(--line); position: relative; z-index: 5; }
.header-inner { max-width: var(--measure); margin: auto; padding: 15px 26px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; font-size: 20px; font-weight: 700; letter-spacing: -.04em; white-space: nowrap; }
.brand-mark { width: 34px; height: 39px; color: var(--blue); }
.nav { display: flex; align-items: center; gap: 26px; }
.nav a { color: var(--ink-soft); text-decoration: none; font-size: 14px; font-weight: 600; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--blue); }
.nav-feature { border: 1px solid var(--line); border-radius: 4px; padding: 8px 13px; }
.menu-toggle { display: none; border: 1px solid var(--line); background: var(--paper); color: var(--ink); border-radius: 4px; padding: 8px 11px; font: 600 14px var(--sans); }
.wrap { width: min(var(--measure), calc(100% - 52px)); margin-inline: auto; }
.eyebrow { color: var(--blue); text-transform: uppercase; letter-spacing: .14em; font-weight: 700; font-size: 11px; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { color: var(--ink); }
h1, .display { font: 500 clamp(42px, 6.5vw, 74px)/1.02 var(--serif); letter-spacing: -.045em; }
h2 { font: 500 clamp(29px, 4vw, 43px)/1.12 var(--serif); letter-spacing: -.03em; }
h3 { font: 700 17px/1.35 var(--sans); }
.lead { font-size: clamp(18px, 2vw, 21px); color: var(--ink-soft); max-width: 720px; line-height: 1.6; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 17px; color: white; background: var(--blue); border: 1px solid var(--blue); border-radius: 3px; text-decoration: none; font-weight: 700; font-size: 14px; transition: background .18s ease, transform .18s ease; }
.button:hover { color: white; background: var(--blue-deep); transform: translateY(-2px); }
.button-outline { background: transparent; color: var(--blue); }
.button-outline:hover { color: white; }
.hero { padding: 74px 0 72px; background: linear-gradient(112deg, var(--blue-wash) 0 62%, #e6f1f7 62% 100%); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.12fr .88fr; align-items: center; gap: 55px; }
.hero h1 { margin: 18px 0 22px; max-width: 680px; }
.hero .lead { margin-bottom: 28px; }
.hero-art { min-height: 330px; position: relative; display: grid; place-items: center; }
.paper-stack { width: min(340px, 90%); aspect-ratio: .92; position: relative; transform: rotate(3deg); }
.sheet { position: absolute; inset: 8% 13%; background: #fff; border: 1px solid #cddce8; box-shadow: 0 18px 42px rgba(21,57,88,.12); padding: 27px; }
.sheet.back { inset: 2% 8% 13% 18%; transform: rotate(-11deg); background: #edf5fa; }
.sheet .seal { width: 53px; height: 53px; border: 1px solid #9bb8ce; border-radius: 50%; display: grid; place-items: center; color: var(--blue); font: 600 24px var(--serif); margin-bottom: 25px; }
.sheet .rule { height: 5px; background: #d7e4ee; margin: 12px 0; width: 88%; }
.sheet .rule.short { width: 56%; }
.sheet .rule.long { width: 100%; }
.sheet-label { color: var(--blue); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .14em; }
.orbit { position: absolute; width: 370px; height: 370px; border: 1px solid #c9dce9; border-radius: 50%; }
.orbit:before, .orbit:after { content: ""; position: absolute; border-radius: 50%; background: var(--blue); }
.orbit:before { width: 12px; height: 12px; top: 20%; right: 10%; }
.orbit:after { width: 7px; height: 7px; bottom: 17%; left: 9%; background: #73a9c9; }
.section { padding: 76px 0; }
.section-tint { background: var(--blue-wash); border-block: 1px solid var(--line); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
.section-head h2 { margin: 8px 0 0; }
.section-head p { color: var(--ink-soft); max-width: 420px; margin: 0; }
.guide-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.guide-card { min-height: 205px; display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); padding: 23px; color: var(--ink); text-decoration: none; transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease; }
.guide-card:hover { transform: translateY(-3px); border-color: #a6bfd2; box-shadow: 0 12px 28px rgba(31,73,107,.08); color: var(--ink); }
.card-meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; color: var(--blue); font-size: 11px; text-transform: uppercase; letter-spacing: .1em; font-weight: 700; }
.card-arrow { font-size: 18px; }
.guide-card h3 { font: 500 23px/1.16 var(--serif); letter-spacing: -.02em; margin-bottom: 10px; }
.guide-card p { color: var(--ink-soft); font-size: 14px; margin-bottom: 0; }
.category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.category-item { background: var(--paper); padding: 22px; min-height: 125px; text-decoration: none; }
.category-item span { display: block; color: var(--ink); font: 500 23px var(--serif); margin-bottom: 5px; }
.category-item small { color: var(--ink-soft); font-size: 13px; }
.category-item:hover { background: var(--blue-wash); }
.note-band { background: var(--ink); color: #e8f1f7; padding: 40px; display: grid; grid-template-columns: 1fr auto; gap: 30px; align-items: center; }
.note-band h2 { color: #fff; font-size: 32px; margin: 5px 0 8px; }
.note-band p { color: #c2d3e0; margin: 0; max-width: 690px; }
.note-band .button { background: #eff6fa; color: var(--blue-deep); border-color: #eff6fa; white-space: nowrap; }
.page-hero { padding: 66px 0 46px; border-bottom: 1px solid var(--line); background: var(--blue-wash); }
.page-hero h1 { margin: 10px 0 14px; font-size: clamp(42px, 5vw, 60px); }
.page-hero .lead { margin-bottom: 0; }
.content-layout { display: grid; grid-template-columns: minmax(0, 760px) 245px; gap: 70px; align-items: start; padding: 48px 0 80px; }
.prose { font-size: 17px; color: #304b64; }
.prose h2 { margin: 38px 0 14px; font-size: 32px; }
.prose h3 { margin: 28px 0 10px; }
.prose p { margin: 0 0 18px; }
.prose ul, .prose ol { padding-left: 23px; margin: 0 0 22px; }
.prose li { padding-left: 4px; margin: 0 0 9px; }
.prose strong { color: var(--ink); }
.callout { padding: 20px 22px; margin: 26px 0; background: var(--blue-wash); border-left: 3px solid var(--blue); color: var(--ink-soft); }
.contents { position: sticky; top: 20px; padding: 19px; border: 1px solid var(--line); background: #fff; }
.contents h2 { font: 700 11px var(--sans); text-transform: uppercase; letter-spacing: .13em; margin: 0 0 12px; }
.contents a { display: block; color: var(--ink-soft); text-decoration: none; font-size: 13px; padding: 6px 0; }
.contents a:hover { color: var(--blue); }
.article-byline { color: var(--ink-soft); font-size: 13px; margin-top: 15px; }
.article-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.article-row { padding: 18px 20px; border: 1px solid var(--line); background: #fff; text-decoration: none; color: var(--ink); }
.article-row:hover { border-color: #9cb9cf; background: var(--blue-wash); color: var(--ink); }
.article-row small { display: block; color: var(--blue); font-size: 10px; text-transform: uppercase; letter-spacing: .12em; font-weight: 700; margin-bottom: 7px; }
.article-row strong { display: block; font: 500 21px/1.2 var(--serif); }
.article-row p { color: var(--ink-soft); font-size: 13px; margin: 8px 0 0; }
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { padding: 17px 4px; cursor: pointer; color: var(--ink); font-weight: 700; }
.faq details p { color: var(--ink-soft); padding: 0 20px 17px 4px; margin: 0; }
.site-footer { background: #eaf2f7; border-top: 1px solid var(--line); padding: 38px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 40px; padding-bottom: 30px; }
.footer-brand { font-size: 17px; margin-bottom: 10px; }
.footer-copy { color: var(--ink-soft); font-size: 13px; max-width: 390px; }
.footer-col h2 { font: 700 11px var(--sans); text-transform: uppercase; letter-spacing: .14em; margin: 5px 0 11px; }
.footer-col a { display: block; width: fit-content; text-decoration: none; font-size: 13px; color: var(--ink-soft); margin: 6px 0; }
.footer-col a:hover { color: var(--blue); text-decoration: underline; }
.disclaimer { border-top: 1px solid #d1dee8; padding-top: 17px; color: #4f6579; font-size: 12px; line-height: 1.6; }
.copyright { color: #687d8f; font-size: 11px; margin: 9px 0 0; }
.breadcrumb { color: var(--ink-soft); font-size: 12px; margin-bottom: 18px; }
.breadcrumb a { text-decoration: none; }
.category-top { padding: 48px 0 22px; }
.category-top h1 { font-size: clamp(39px,5vw,57px); margin: 9px 0 13px; }
.category-top .lead { margin: 0; }
@media(max-width: 760px) {
 .header-inner { padding: 12px 20px; }
 .menu-toggle { display: inline-flex; }
 .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; padding: 14px 20px 20px; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 0; box-shadow: 0 14px 20px rgba(25,56,80,.08); }
 .nav.is-open { display: flex; }
 .nav a { padding: 11px 5px; border-bottom: 1px solid var(--line); }
 .nav .nav-feature { border: 0; border-bottom: 1px solid var(--line); border-radius: 0; padding: 11px 5px; }
 .wrap { width: min(100% - 36px, var(--measure)); }
 .hero { padding: 52px 0 34px; }
 .hero-grid { grid-template-columns: 1fr; gap: 20px; }
 .hero-art { min-height: 260px; }
 .paper-stack { width: 230px; }
 .sheet { padding: 20px; }
 .sheet .seal { width: 42px; height: 42px; margin-bottom: 18px; }
 .orbit { width: 270px; height: 270px; }
 .section { padding: 54px 0; }
 .section-head { display: block; }
 .section-head p { margin-top: 12px; }
 .guide-grid, .category-grid { grid-template-columns: 1fr; }
 .guide-card { min-height: 170px; }
 .note-band { padding: 27px 22px; grid-template-columns: 1fr; }
 .note-band .button { justify-self: start; }
 .content-layout { grid-template-columns: 1fr; gap: 24px; padding-top: 30px; }
 .contents { position: static; order: -1; }
 .article-list { grid-template-columns: 1fr; }
 .page-hero { padding: 48px 0 35px; }
 .footer-grid { grid-template-columns: 1fr 1fr; gap: 22px; }
 .footer-grid > :first-child { grid-column: 1/-1; }
}
@media(prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; } }