:root {
  color-scheme: light dark;
  --bg: #f5f8fc;
  --surface: #fbfdff;
  --surface-strong: #ffffff;
  --surface-blue: #e8f0ff;
  --ink: #071425;
  --muted: #4c5c70;
  --accent: #0a5cff;
  --accent-hover: #0649cc;
  --accent-soft: #dce8ff;
  --mint: #4dcfb2;
  --line: #d6e0ed;
  --shadow: 0 24px 70px rgba(34, 78, 132, .14);
  --shadow-soft: 0 12px 34px rgba(34, 78, 132, .09);
  --radius: 24px;
  --radius-small: 16px;
  --shell: 1240px;
  --display: "Avenir Next", "Segoe UI Variable Display", "Segoe UI", system-ui, sans-serif;
  --body: "Avenir Next", "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: var(--accent); text-underline-offset: .22em; text-decoration-thickness: .08em; }
a:hover { color: var(--accent-hover); }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
::selection { background: var(--accent); color: #f7fbff; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.shell { width: min(calc(100% - 48px), var(--shell)); margin-inline: auto; }
.skip-link { position: fixed; top: 12px; left: 12px; z-index: 100; padding: 10px 16px; border-radius: 999px; background: var(--ink); color: var(--surface); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid color-mix(in srgb, var(--line) 78%, transparent); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(18px) saturate(140%); }
.nav-shell { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); font-weight: 760; letter-spacing: -.025em; text-decoration: none; white-space: nowrap; }
.brand:hover { color: var(--ink); }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 11px; background: var(--accent); color: #f7fbff; font-size: 16px; font-weight: 800; box-shadow: inset 0 1px 0 rgba(255,255,255,.28); }
.primary-nav { display: flex; align-items: center; gap: 28px; }
.primary-nav a { color: var(--muted); font-size: 14px; font-weight: 700; text-decoration: none; white-space: nowrap; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--ink); }
.primary-nav a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 7px; }
.menu-button { display: none; min-height: 42px; padding: 0 18px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--ink); font-weight: 750; }

.hero { min-height: min(760px, calc(100dvh - 72px)); display: grid; grid-template-columns: minmax(0, .9fr) minmax(440px, 1.1fr); align-items: center; gap: clamp(40px, 6vw, 96px); padding-block: clamp(64px, 8vw, 104px); }
.hero-copy { position: relative; z-index: 1; }
h1, h2, h3 { margin: 0; font-family: var(--display); letter-spacing: -.045em; line-height: 1.02; text-wrap: balance; }
.hero h1 { max-width: 10ch; font-size: clamp(3.45rem, 6vw, 5.55rem); font-weight: 780; }
.hero-copy > p { max-width: 600px; margin: 28px 0 0; color: var(--muted); font-size: clamp(1.08rem, 1.8vw, 1.28rem); line-height: 1.55; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button { min-height: 52px; display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; border: 1px solid transparent; border-radius: 999px; font-size: 15px; font-weight: 780; line-height: 1; text-decoration: none; white-space: nowrap; transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease; }
.button:active { transform: translateY(1px) scale(.985); }
.button-primary { background: var(--accent); color: #f7fbff; box-shadow: 0 12px 28px rgba(10, 92, 255, .22); }
.button-primary:hover { background: var(--accent-hover); color: #f7fbff; transform: translateY(-2px); }
.button-secondary { border-color: var(--line); background: var(--surface); color: var(--ink); }
.button-secondary:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); background: var(--accent-soft); color: var(--ink); transform: translateY(-2px); }
.hero-media { margin: 0; overflow: hidden; border-radius: var(--radius); background: var(--surface-blue); box-shadow: var(--shadow); transform: rotate(1.1deg); }
.hero-media img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }

.source-bar { border-block: 1px solid var(--line); background: var(--surface); }
.source-bar-inner { min-height: 76px; display: grid; grid-template-columns: 1.35fr repeat(3, 1fr); align-items: center; gap: 24px; color: var(--muted); font-size: 13px; }
.source-bar-inner strong { color: var(--ink); font-size: 14px; }
.section { padding-block: clamp(84px, 10vw, 136px); }
.section + .section { padding-top: 0; }
.section-heading { max-width: 720px; margin-bottom: 42px; }
.section-heading h2, .standards-panel h2, .reading-heading h2 { font-size: clamp(2.35rem, 4.3vw, 4.4rem); font-weight: 740; }
.section-heading p, .reading-heading p { max-width: 62ch; margin: 20px 0 0; color: var(--muted); font-size: 1.08rem; }
.guide-grid { display: grid; grid-template-columns: minmax(0, 1.32fr) minmax(320px, .68fr); gap: 22px; align-items: stretch; }
.guide-card { min-height: 100%; display: flex; flex-direction: column; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface-strong); color: var(--ink); text-decoration: none; box-shadow: var(--shadow-soft); transition: transform .3s cubic-bezier(.16,1,.3,1), box-shadow .3s ease, border-color .3s ease; }
.guide-card:hover { color: var(--ink); border-color: color-mix(in srgb, var(--accent) 34%, var(--line)); transform: translateY(-6px); box-shadow: var(--shadow); }
.guide-card img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.guide-card:not(.guide-card-large) img { aspect-ratio: 4 / 3; }
.guide-card-copy { flex: 1; display: flex; flex-direction: column; align-items: flex-start; padding: clamp(24px, 4vw, 42px); }
.guide-type { margin: 0 0 16px; color: var(--accent); font-size: 14px; font-weight: 780; }
.guide-card h3 { max-width: 19ch; font-size: clamp(1.65rem, 3vw, 2.75rem); line-height: 1.08; }
.guide-card span { margin-top: auto; padding-top: 30px; color: var(--accent); font-size: 15px; font-weight: 780; }
.standards-panel { display: grid; grid-template-columns: .86fr 1.14fr; gap: clamp(48px, 8vw, 110px); padding: clamp(40px, 7vw, 88px); border: 1px solid color-mix(in srgb, var(--accent) 18%, var(--line)); border-radius: var(--radius); background: linear-gradient(145deg, var(--surface-blue), var(--surface)); }
.standards-panel > div:first-child > p { max-width: 44ch; margin: 22px 0 0; color: var(--muted); }
.standards-list { display: grid; align-content: center; gap: 0; }
.standards-list p { display: grid; grid-template-columns: 160px 1fr; gap: 24px; margin: 0; padding: 24px 0; border-bottom: 1px solid var(--line); }
.standards-list p:last-child { border-bottom: 0; }
.standards-list strong { font-size: 15px; }
.standards-list span { color: var(--muted); }
.resource-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-block: 1px solid var(--line); }
.resource-grid a { min-height: 150px; display: flex; flex-direction: column; justify-content: space-between; gap: 24px; padding: 28px; border-right: 1px solid var(--line); color: var(--ink); text-decoration: none; transition: background .2s ease; }
.resource-grid a:first-child { padding-left: 0; }
.resource-grid a:last-child { border-right: 0; padding-right: 0; }
.resource-grid a:hover { background: color-mix(in srgb, var(--surface-blue) 65%, transparent); }
.resource-grid strong { font-size: 18px; }
.resource-grid span { color: var(--muted); font-size: 14px; }

.article-hero { display: grid; grid-template-columns: minmax(0, .82fr) minmax(420px, 1.18fr); gap: clamp(44px, 7vw, 96px); align-items: center; padding-block: clamp(64px, 8vw, 110px); }
.article-label { margin: 0 0 22px; color: var(--accent); font-size: 15px; font-weight: 780; }
.article-hero h1 { max-width: 12ch; font-size: clamp(3.25rem, 5.8vw, 5.5rem); font-weight: 760; }
.article-hero-copy > p:not(.article-label) { max-width: 590px; margin: 26px 0 0; color: var(--muted); font-size: 1.16rem; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 28px; color: var(--muted); font-size: 13px; font-weight: 720; }
.article-hero-media { margin: 0; overflow: hidden; border-radius: var(--radius); box-shadow: var(--shadow); }
.article-hero-media img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) minmax(260px, 340px); justify-content: space-between; gap: 80px; padding-block: 48px 128px; }
.article-main { min-width: 0; }
.urgent-note, .wide-note { padding: 28px 30px; border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line)); border-radius: var(--radius-small); background: var(--surface-blue); }
.urgent-note p, .wide-note p { margin: 8px 0 0; color: var(--muted); }
.steps { list-style: none; margin: 46px 0 0; padding: 0; }
.steps li { display: grid; grid-template-columns: 48px 1fr; gap: 22px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.steps li:first-child { border-top: 1px solid var(--line); }
.step-number { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%; background: var(--accent); color: #f7fbff; font-weight: 800; font-variant-numeric: tabular-nums; }
.steps h2 { font-size: clamp(1.55rem, 2.7vw, 2.2rem); font-weight: 740; }
.steps p { max-width: 68ch; margin: 14px 0 0; color: var(--muted); }
.disclaimer { margin-top: 34px; color: var(--muted); font-size: 14px; }
.article-aside { align-self: start; position: sticky; top: 108px; display: grid; gap: 18px; }
.aside-panel, .aside-link { padding: 28px; border-radius: var(--radius-small); }
.aside-panel { background: var(--ink); color: var(--surface); }
.aside-panel h2 { font-size: 1.5rem; }
.aside-panel p { margin: 14px 0 0; color: color-mix(in srgb, var(--surface) 75%, transparent); font-size: 14px; }
.aside-link { display: grid; gap: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); text-decoration: none; }
.aside-link span { color: var(--muted); font-size: 14px; }

.reading-shell { max-width: 1020px; padding-block: 40px 128px; }
.reading-shell > section + section { margin-top: 112px; }
.reading-heading { max-width: 720px; margin-bottom: 40px; }
.comparison-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin: 0; }
.comparison-grid > div { min-height: 170px; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-small); background: var(--surface); }
.comparison-grid > div:nth-child(2), .comparison-grid > div:nth-child(5) { background: var(--surface-blue); }
.comparison-grid dt { font-size: 19px; font-weight: 780; }
.comparison-grid dd { margin: 14px 0 0; color: var(--muted); }
.question-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 44px; margin: 0; padding: 0; list-style: none; counter-reset: question; }
.question-grid li { counter-increment: question; display: grid; grid-template-columns: 34px 1fr; align-items: start; gap: 14px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.question-grid li::before { content: counter(question); color: var(--accent); font-weight: 800; font-variant-numeric: tabular-nums; }
.wide-note { display: grid; grid-template-columns: 220px 1fr; gap: 28px; margin-top: 80px; }
.wide-note p { margin: 0; }

.page-main { padding-bottom: 120px; }
.plain-hero { padding-block: clamp(84px, 12vw, 160px); }
.plain-hero h1 { max-width: 14ch; font-size: clamp(3.4rem, 6.5vw, 6rem); font-weight: 760; }
.plain-hero p { max-width: 700px; margin: 30px 0 0; color: var(--muted); font-size: 1.2rem; }
.about-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(54px, 9vw, 130px); padding-bottom: 110px; }
.about-intro { align-self: start; position: sticky; top: 112px; }
.about-intro h2 { font-size: clamp(2.2rem, 4vw, 3.8rem); }
.about-intro p { margin: 20px 0 0; color: var(--muted); }
.principles { display: grid; gap: 0; }
.principles article { padding: 30px 0; border-bottom: 1px solid var(--line); }
.principles article:first-child { border-top: 1px solid var(--line); }
.principles h3 { font-size: 1.65rem; }
.principles p { margin: 12px 0 0; color: var(--muted); }
.scope-panel { display: grid; grid-template-columns: 1.5fr .5fr; gap: 70px; padding: clamp(36px, 6vw, 64px); border-radius: var(--radius); background: var(--surface-blue); }
.scope-panel h2 { font-size: 1.65rem; }
.scope-panel p { max-width: 65ch; margin: 14px 0 0; color: var(--muted); }

.legal-page { max-width: 940px; padding-block: clamp(72px, 10vw, 132px); }
.legal-heading { padding-bottom: 48px; border-bottom: 1px solid var(--line); }
.legal-heading h1 { font-size: clamp(3.1rem, 6vw, 5.4rem); }
.legal-heading p { margin: 20px 0 0; color: var(--muted); }
.legal-content { max-width: 740px; padding-top: 36px; }
.legal-content section { padding: 30px 0; }
.legal-content h2 { font-size: 1.65rem; }
.legal-content p { margin: 14px 0 0; color: var(--muted); }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-grid { display: grid; grid-template-columns: 1.3fr .8fr .7fr; gap: 50px; align-items: end; padding-block: 54px; }
.footer-brand { margin-bottom: 14px; }
.footer-grid > div > p, .copyright { margin: 0; color: var(--muted); font-size: 14px; }
.footer-grid nav { display: grid; gap: 9px; }
.footer-grid nav a { color: var(--muted); font-size: 14px; text-decoration: none; }
.footer-grid nav a:hover { color: var(--ink); }
.copyright { text-align: right; }

.error-page { min-height: 100dvh; display: grid; }
.error-shell { min-height: 100dvh; display: flex; flex-direction: column; padding-block: 36px 72px; }
.error-content { max-width: 740px; margin: auto 0; }
.error-code { margin: 0 0 12px; color: var(--accent); font-size: 15px; font-weight: 800; }
.error-content h1 { font-size: clamp(3.5rem, 8vw, 7rem); }
.error-content > p:not(.error-code) { max-width: 580px; margin: 24px 0 0; color: var(--muted); font-size: 1.15rem; }

.js .reveal { opacity: 0; transform: translateY(18px); }
.js .reveal.is-visible { opacity: 1; transform: translateY(0); transition: opacity .7s cubic-bezier(.16,1,.3,1), transform .7s cubic-bezier(.16,1,.3,1); }

@media (max-width: 980px) {
  .hero, .article-hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-copy, .article-hero-copy { max-width: 780px; }
  .hero h1 { max-width: 11ch; }
  .hero-media { transform: none; }
  .source-bar-inner { grid-template-columns: repeat(2, 1fr); padding-block: 22px; }
  .guide-grid { grid-template-columns: 1fr; }
  .guide-card:not(.guide-card-large) { display: grid; grid-template-columns: minmax(280px, .8fr) 1.2fr; }
  .guide-card:not(.guide-card-large) img { height: 100%; aspect-ratio: auto; }
  .standards-panel, .article-layout, .about-grid { grid-template-columns: 1fr; }
  .article-layout { gap: 52px; }
  .article-aside, .about-intro { position: static; }
  .article-aside { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .copyright { text-align: left; }
}

@media (max-width: 760px) {
  .shell { width: min(calc(100% - 32px), var(--shell)); }
  .nav-shell { min-height: 66px; }
  .menu-button { display: inline-flex; align-items: center; justify-content: center; }
  .primary-nav { width: calc(100% - 32px); position: absolute; top: 58px; left: 16px; display: grid; gap: 0; padding: 10px; border: 1px solid var(--line); border-radius: var(--radius-small); background: var(--surface-strong); box-shadow: var(--shadow); }
  .primary-nav a { padding: 13px 12px; border-radius: 10px; }
  .primary-nav a:hover { background: var(--surface-blue); }
  .js .primary-nav { opacity: 0; visibility: hidden; transform: translateY(-8px); transition: opacity .2s ease, transform .2s ease, visibility .2s; }
  .js .primary-nav[data-open="true"] { opacity: 1; visibility: visible; transform: translateY(0); }
  .hero { gap: 42px; padding-block: 56px 72px; }
  .hero h1, .article-hero h1, .plain-hero h1 { font-size: clamp(2.85rem, 13vw, 4.25rem); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .source-bar-inner { grid-template-columns: 1fr; gap: 8px; }
  .source-bar-inner strong { margin-bottom: 6px; }
  .section { padding-block: 82px; }
  .section + .section { padding-top: 0; }
  .section-heading h2, .standards-panel h2, .reading-heading h2 { font-size: clamp(2.2rem, 11vw, 3.2rem); }
  .guide-card:not(.guide-card-large) { display: flex; }
  .guide-card:not(.guide-card-large) img { height: auto; aspect-ratio: 16 / 10; }
  .standards-panel { gap: 32px; padding: 30px 24px; }
  .standards-list p { grid-template-columns: 1fr; gap: 7px; }
  .resource-grid { grid-template-columns: 1fr; }
  .resource-grid a, .resource-grid a:first-child, .resource-grid a:last-child { min-height: 120px; padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .resource-grid a:last-child { border-bottom: 0; }
  .article-hero { gap: 38px; padding-block: 54px 72px; }
  .article-layout, .reading-shell { padding-block: 30px 90px; }
  .article-aside { grid-template-columns: 1fr; }
  .steps li { grid-template-columns: 40px 1fr; gap: 16px; }
  .step-number { width: 36px; height: 36px; }
  .comparison-grid, .question-grid { grid-template-columns: 1fr; }
  .reading-shell > section + section { margin-top: 82px; }
  .wide-note { grid-template-columns: 1fr; gap: 8px; margin-top: 60px; }
  .plain-hero { padding-block: 72px 92px; }
  .about-grid { padding-bottom: 80px; }
  .scope-panel { grid-template-columns: 1fr; gap: 34px; padding: 30px 24px; }
  .legal-page { padding-block: 68px 92px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; align-items: start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js .reveal { opacity: 1; transform: none; }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header { background: var(--bg); backdrop-filter: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #08111f;
    --surface: #0d1929;
    --surface-strong: #122238;
    --surface-blue: #132b4f;
    --ink: #edf5ff;
    --muted: #aebdd0;
    --accent: #6ea0ff;
    --accent-hover: #90b7ff;
    --accent-soft: #17345f;
    --mint: #68d8bf;
    --line: #263a53;
    --shadow: 0 26px 72px rgba(0, 0, 0, .32);
    --shadow-soft: 0 12px 34px rgba(0, 0, 0, .22);
  }
  .button-primary { color: #071425; background: #8bb4ff; }
  .button-primary:hover { color: #071425; background: #a9c8ff; }
  .brand-mark, .step-number { color: #071425; background: #8bb4ff; }
  .aside-panel { background: #dceaff; color: #071425; }
  .aside-panel p { color: #33465f; }
  .hero-media img, .article-hero-media img, .guide-card img { filter: brightness(.88) contrast(1.04); }
}