@charset "UTF-8";

:root {
  color-scheme: dark;
  --night: #0b1116;
  --panel: #111c23;
  --deep: #080d11;
  --text: #e4e9eb;
  --muted: #aebdc3;
  --white: #f5f3eb;
  --gold: #e8bd78;
  --teal: #82c4b5;
  --line: #2b3b44;
  --sans: "Segoe UI", Inter, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
  --space: clamp(4.5rem, 8vw, 8rem);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 7rem; }
body { margin: 0; background: var(--night); color: var(--text); font: 1.125rem/1.75 var(--sans); -webkit-font-smoothing: antialiased; }
::selection { background: var(--gold); color: var(--night); }
[hidden] { display: none !important; }
img, svg { max-width: 100%; }
img { display: block; height: auto; }
figure { margin: 0; min-width: 0; }
button, input, select, textarea { font: inherit; }
button, summary { cursor: pointer; }
button { color: inherit; }
input, select, textarea { max-width: 100%; }
a { color: var(--teal); text-underline-offset: .24em; text-decoration-thickness: 1px; }
a:hover { color: var(--gold); }
a, button, input, select, summary { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 5px; }
h1, h2, h3, h4 { color: var(--white); text-wrap: balance; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-weight: 700; }
h1 { font-size: clamp(3rem, 6.4vw, 6.4rem); line-height: 1.04; letter-spacing: -.052em; }
h2 { font-size: clamp(2.2rem, 3.5vw, 3.6rem); line-height: 1.13; letter-spacing: -.04em; }
h3 { font-size: clamp(1.45rem, 2.1vw, 2rem); line-height: 1.23; letter-spacing: -.025em; }
p + p { margin-top: 1.1em; }
strong { font-weight: 650; color: var(--white); }
small { font-size: .875em; }
main { min-width: 0; }
main > section + section { margin-top: var(--space); }
.wrap { width: min(1320px, calc(100% - 7rem)); margin-inline: auto; }
.skip-link { position: fixed; top: 1rem; left: 1rem; z-index: 100; padding: .7rem 1.2rem; background: var(--gold); color: var(--night); transform: translateY(-180%); }
.skip-link:focus { transform: none; }

/* A quiet header leaves the scale to the landscape and the argument. */
.site-header { position: sticky; top: 0; z-index: 30; background: #0b1116f5; border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); }
.site-header > .wrap { display: flex; justify-content: space-between; align-items: center; gap: 2rem; min-height: 86px; padding-block: .85rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; color: var(--white); text-decoration: none; }
.brand-mark { flex: 0 0 40px; width: 40px; height: 40px; }
.brand-words { font-size: .94rem; line-height: 1.25; font-weight: 650; letter-spacing: -.02em; }
.main-nav { display: flex; align-items: center; gap: 1.6rem; font-size: .91rem; }
.main-nav > a { padding: .7rem 0; color: var(--text); text-decoration: none; white-space: nowrap; }
.main-nav > a:hover, .main-nav > a.active { color: var(--gold); box-shadow: 0 1px var(--gold); }
.main-nav details { position: relative; }
.main-nav summary { display: flex; align-items: center; gap: 1.1rem; min-height: 44px; padding: .45rem .85rem; border: 1px solid #53636a; list-style: none; white-space: nowrap; }
.main-nav summary::-webkit-details-marker { display: none; }
.main-nav summary::after { content: "+"; font-size: 1.25rem; }
.main-nav details[open] summary { background: var(--gold); border-color: var(--gold); color: var(--night); }
.main-nav details[open] summary::after { content: "−"; }
.main-nav details > div { position: absolute; top: calc(100% + .9rem); right: 0; width: 350px; max-width: calc(100vw - 2rem); max-height: min(75vh, 660px); overflow: auto; padding: .65rem; border: 1px solid #52626b; background: #111c23; box-shadow: 0 1rem 3rem #0008; }
.nav-menu a { display: block; padding: .6rem .8rem; color: var(--text); text-decoration: none; line-height: 1.45; }
.nav-menu a:hover { background: #22333c; color: var(--gold); }
.eyebrow { margin-bottom: 1.2rem; color: var(--gold); font-size: .76rem; font-weight: 700; line-height: 1.5; letter-spacing: .16em; text-transform: uppercase; }
.actions { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 2rem; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 1.2rem; min-height: 51px; max-width: 100%; padding: .75rem 1.3rem; border: 1px solid var(--gold); background: var(--gold); color: var(--night); font-size: .94rem; font-weight: 650; line-height: 1.4; text-decoration: none; text-align: center; }
.button:hover { color: var(--night); background: #f3d199; border-color: #f3d199; }
.button.secondary { background: #0b11165c; border-color: #94a5ac; color: var(--white); }
.button.secondary:hover { background: #203139; border-color: var(--teal); }
.lede { max-width: 48rem; font-size: clamp(1.25rem, 2vw, 1.55rem); line-height: 1.6; color: var(--muted); }

/* The luminous edge is an original abstract motif, not a borrowed symbol. */
.hero, .page-hero { position: relative; isolation: isolate; overflow: hidden; background: var(--deep); }
.hero-home { display: flex; flex-direction: column; justify-content: center; min-height: min(900px, calc(100svh - 86px)); }
.hero-media, .hero-shade { position: absolute; inset: 0; z-index: -2; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; object-position: center 55%; }
.hero-shade { z-index: -1; background: linear-gradient(90deg, #070d13e8 0%, #09121cbb 29%, #0b142455 58%, #111b2614 100%), linear-gradient(0deg, #0b1116f2, transparent 40%, #0b111626); }
.hero-content { position: relative; padding-block: clamp(3.5rem, 6vw, 6rem) 5.5rem; }
.hero-home h1 { max-width: 13ch; font-size: clamp(3.8rem, 7.2vw, 7.3rem); font-weight: 750; line-height: .99; letter-spacing: -.065em; }
.hero-home h1 span { color: #f1cc91; }
.hero-home .eyebrow { max-width: 44rem; }
.hero-intro { max-width: 36rem; margin-top: 1.8rem; font-size: clamp(1.15rem, 1.6vw, 1.35rem); line-height: 1.6; color: #edf0ed; }
.hero-detail { max-width: 34rem; font-size: 1rem; line-height: 1.65; color: #c4cfd1; }
.hero-caption { position: absolute; bottom: 1.1rem; inset-inline: 0; color: #bac7cd; font-size: .73rem; line-height: 1.5; }
.hero-caption p { max-width: 62rem; }
.hero-caption a { color: inherit; }
.hero::after, .page-hero::after { content: ""; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: linear-gradient(90deg, transparent, var(--gold) 36%, var(--teal) 67%, transparent); }

.choice-section { padding-block: 1rem 0; }
.section-heading { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 1.1rem 5rem; margin-bottom: 3rem; }
.section-heading > .eyebrow { grid-column: 1 / -1; margin: 0; }
.section-heading > p:not(.eyebrow) { max-width: 39rem; color: var(--muted); font-size: 1.04rem; }
.section-heading h2:last-child { grid-column: 1 / -1; max-width: 26ch; }
.choice-grid { display: grid; grid-template-columns: 1fr 1fr; border-block: 1px solid var(--line); }
.choice-grid article { position: relative; padding: 2.5rem 3rem 2.5rem 0; min-width: 0; }
.choice-grid article + article { border-left: 1px solid #566d70; padding-left: 3rem; padding-right: 0; }
.choice-grid .choice-possibility { background: radial-gradient(ellipse at 0 50%, #27554b26, transparent 80%); }
.choice-grid .eyebrow { font-size: .73rem; }
.choice-pressure .eyebrow { color: #d5a9a1; }
.choice-possibility .eyebrow { color: var(--teal); }
.choice-grid h3 { font-size: clamp(1.6rem, 2.5vw, 2.5rem); }
.choice-grid p:not(.eyebrow) { margin-top: 1.1rem; color: var(--muted); }
.choice-grid ul { padding-left: 1.15rem; margin: 1.5rem 0 2rem; font-size: 1.03rem; line-height: 1.75; }
.choice-grid li { padding-left: .3rem; margin-bottom: 1rem; }
.choice-grid li::marker { color: #7f929c; }
.choice-possibility li::marker { color: var(--teal); }
.choice-grid > article > a { font-size: .95rem; }
.choice-bridge { padding: 2.5rem 0 0; }
.choice-bridge > p { max-width: 65ch; font-size: 1.25rem; line-height: 1.7; }
.choice-axis { display: flex; flex-wrap: wrap; gap: 1rem 2rem; margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--line); font-size: .78rem; font-weight: 650; text-transform: uppercase; letter-spacing: .08em; color: var(--teal); }
.choice-axis span + span::before { content: "↗"; margin-right: 2rem; color: var(--gold); }
.intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); padding-block: var(--space); border-block: 1px solid var(--line); }
.intro-grid > *, .split-feature > * { min-width: 0; }
.intro-grid p { color: var(--muted); }
.intro-grid .eyebrow { color: var(--gold); }
.path-list { border-top: 1px solid var(--line); }
.path-list article { display: grid; grid-template-columns: 5rem minmax(0, 1fr) auto; gap: 1.5rem; padding-block: 2.3rem; border-bottom: 1px solid var(--line); }
.path-number { color: #83999f; font-size: 3rem; font-weight: 300; line-height: 1.1; letter-spacing: -.05em; }
.path-copy { min-width: 0; }
.path-copy h2, .path-copy h3 { margin-bottom: .7rem; }
.path-copy h2 { font-size: clamp(1.6rem, 2.5vw, 2.3rem); }
.path-copy h2 a, .path-copy h3 a { color: var(--white); text-decoration: none; }
.path-copy a:hover { color: var(--gold); }
.path-copy p { max-width: 63ch; color: var(--muted); }
.path-list article > a { align-self: center; font-size: .94rem; white-space: nowrap; }
.path-list > section { padding-block: 2rem; }
.path-list > section h2 { margin-bottom: 1.2rem; }
.path-list > section li { margin-bottom: 1.6rem; }
.path-list > section li p { margin-top: .4rem; color: var(--muted); }
.feature-strip { position: relative; padding-block: var(--space); background: linear-gradient(115deg, #18272d, #0f1a21 65%); border-block: 1px solid #42605f; }
.feature-strip h2 { max-width: 24ch; }
.feature-strip p { max-width: 60ch; margin-top: 1.3rem; }
.feature-strip .eyebrow { margin-top: 0; }
.split-feature { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: clamp(2rem, 6vw, 6rem); }
.split-feature p { margin-top: 1.3rem; }
.split-feature .eyebrow { margin-top: 0; }
.split-feature img { width: 100%; }
.split-feature .media-wide { margin: 0; }
.media-wide { margin-block: var(--space); }
.media-wide img { width: 100%; height: auto; }
figcaption { margin-top: .8rem; color: var(--muted); font-size: .84rem; line-height: 1.6; }
.photo-portrait img { max-height: 32rem; object-fit: contain; background: var(--deep); }
.image-credit-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; margin-top: 2rem; }
.image-credit { min-width: 0; padding-bottom: 1.5rem; border-bottom: 1px solid var(--line); scroll-margin-top: 7rem; }
.image-credit img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.prose .image-credit h3 { margin-block: 1rem .7rem; font-size: 1.2rem; }
.prose .image-credit p { font-size: .88rem; line-height: 1.65; margin-bottom: .7rem; }

.page-head { padding-block: 2rem 4rem; margin-bottom: 1.4rem; border-bottom: 1px solid var(--line); }
.breadcrumb { display: flex; flex-wrap: wrap; gap: .6rem; margin-bottom: 3rem; color: var(--muted); font-size: .85rem; }
.breadcrumb a { color: inherit; }
.page-head h1 { max-width: 20ch; }
.page-head .lede { margin-top: 1.7rem; }
.page-head.page-hero { margin: 0 0 1.4rem; padding: 0; min-height: 610px; display: flex; align-items: center; }
.page-hero .hero-content { padding-block: 2rem 6rem; }
.page-hero .breadcrumb { margin-bottom: 2.8rem; }
.page-hero .lede { max-width: 43rem; color: #dbe3e4; }
.page-hero .hero-shade { background: linear-gradient(90deg, #080e16f2, #0a1118b8 48%, #0b111642), linear-gradient(0deg, #0b1116eb, transparent 60%); }
.reading-layout { display: grid; grid-template-columns: 235px minmax(0, 1fr); gap: clamp(2.5rem, 5.5vw, 5.5rem); align-items: start; padding-block: 3rem var(--space); }
.on-this-page { position: sticky; top: 7rem; max-height: calc(100svh - 8rem); overflow: auto; padding-right: .5rem; font-size: .9rem; line-height: 1.55; }
.on-this-page summary { margin-bottom: .9rem; font-weight: 650; color: var(--white); }
.on-this-page ol, .on-this-page ul { padding: 0; margin: 0; list-style: none; }
.on-this-page a { display: block; padding: .5rem .7rem; border-left: 1px solid var(--line); color: var(--muted); text-decoration: none; }
.on-this-page a:hover { background: #17272e; border-left-color: var(--teal); color: var(--white); }
.prose { min-width: 0; max-width: 74ch; font-size: 1.15rem; line-height: 1.85; }
.prose .chapter { margin-bottom: 4.8rem; scroll-margin-top: 7rem; }
.prose h2 { margin: 2.5rem 0 1.4rem; font-size: clamp(1.85rem, 3vw, 2.65rem); line-height: 1.2; }
.prose h3 { margin: 2rem 0 1rem; font-size: 1.55rem; line-height: 1.3; }
.prose h4 { margin: 1.8rem 0 .8rem; }
.prose > :first-child, .prose .chapter > :first-child { margin-top: 0; }
.prose p { margin-block: 0 1.3rem; }
.prose ul, .prose ol { padding-left: 1.5rem; margin-block: 1.4rem; }
.prose li { padding-left: .25rem; margin-block: .5rem; }
.prose li::marker { color: var(--gold); }
.prose a, .reference-list a, .project-grid a { overflow-wrap: anywhere; }
.prose figure { margin-block: 2.3rem; }
.prose figure img { width: 100%; }
.prose blockquote { margin: 2rem 0; padding: 1.5rem 2rem; background: var(--panel); border-left: 2px solid var(--gold); font-size: 1.3rem; }
.prose blockquote > :last-child { margin: 0; }
.prose table { border-collapse: collapse; width: 100%; margin-block: 2rem; font-size: .95rem; }
.prose th, .prose td { padding: .8rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); overflow-wrap: anywhere; }
.prose th { background: var(--panel); }
.prose details { padding: 1.3rem; margin-block: 1.5rem; border: 1px solid var(--line); }
.prose summary { color: var(--teal); font-weight: 650; }
.prose details[open] summary { margin-bottom: 1rem; }
.source-note { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; line-height: 1.7; overflow-wrap: anywhere; }
.page-nav { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: 2rem; padding-bottom: 2.5rem; margin-bottom: 3rem; border-bottom: 1px solid var(--line); }
.page-nav > a { display: flex; flex-direction: column; gap: .65rem; min-width: 0; padding: 1.3rem 1.5rem; border: 1px solid #435c65; background: var(--panel); color: var(--white); line-height: 1.45; text-decoration: none; }
.page-nav > a:hover { background: #1b2d35; border-color: var(--teal); }
.page-direction { color: var(--teal); font-size: .74rem; font-weight: 650; letter-spacing: .1em; text-transform: uppercase; }
.page-title { font-size: 1.2rem; font-weight: 600; overflow-wrap: anywhere; }
.page-next { text-align: right; }
.page-next .page-direction { color: var(--gold); }
.page-position { display: flex; flex-direction: column; justify-content: center; gap: .4rem; color: var(--muted); font-size: .8rem; text-align: center; white-space: nowrap; }
.page-position a { font-size: .88rem; }

.library-tools { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(180px, 1fr); gap: 1.2rem; align-items: end; margin-block: 2.5rem 1.3rem; padding: 1.5rem; border: 1px solid var(--line); background: var(--panel); }
.library-tools label, .control-grid label { display: grid; gap: .6rem; min-width: 0; font-size: 1rem; font-weight: 600; line-height: 1.5; }
.library-tools input, .library-tools select, .control-grid input { width: 100%; min-height: 50px; padding: .65rem .8rem; border: 1px solid #6a8088; border-radius: 0; background: #0b141a; color: var(--white); font-size: 1rem; font-weight: 400; }
input::placeholder { color: #a3b2b9; opacity: 1; }
#result-count { grid-column: 1 / -1; color: var(--muted); font-size: .9rem; margin: 0; }
.reference-list { margin-bottom: var(--space); }
.reference-list article { padding: 1.8rem 0; border-bottom: 1px solid var(--line); }
.reference-list h2 { font-size: clamp(1.35rem, 2.3vw, 1.9rem); margin-bottom: .8rem; }
.reference-list p { margin-top: .8rem; max-width: 75ch; }
.ref-meta { color: var(--muted); font-size: .77rem; text-transform: uppercase; letter-spacing: .07em; line-height: 1.6; }
.link-row { display: flex; flex-wrap: wrap; gap: .6rem 1.4rem; margin-top: 1.2rem; font-size: .96rem; }
.project-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-block: 2rem var(--space); }
.project-grid article { min-width: 0; display: flex; flex-direction: column; padding: 2rem; background: var(--panel); }
.project-grid h2 { margin-block: .9rem 1.1rem; font-size: 1.75rem; }
.project-grid p { margin-bottom: 1rem; }
.project-grid .link-row { margin-top: auto; padding-top: .5rem; }
.tool-panel { padding: clamp(1.4rem, 4vw, 3.2rem); margin-block: 2rem 3rem; border: 1px solid #3e535b; background: var(--panel); scroll-margin-top: 7rem; }
.tool-panel h2 { max-width: 24ch; }
.tool-panel > p { max-width: 69ch; margin-top: 1.1rem; }
.tool-panel > .eyebrow { margin-top: 0; }
.control-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.3rem; margin-block: 1.8rem 1.3rem; }
.preset-buttons { display: flex; flex-wrap: wrap; gap: .6rem; margin-block: 1.6rem; }
.preset-buttons button { min-height: 44px; padding: .55rem .9rem; background: transparent; color: var(--teal); border: 1px solid #6b948b; font-size: .93rem; }
.preset-buttons button:hover, .preset-buttons button[aria-pressed="true"] { background: var(--teal); color: var(--night); border-color: var(--teal); }
.calculator-result { margin-top: 1.7rem; padding: 1.8rem; border-left: 3px solid var(--gold); background: #1d2d32; }
.calculator-result output { display: block; margin-block: .6rem; color: var(--gold); font-size: clamp(2rem, 4.5vw, 3.7rem); font-weight: 650; letter-spacing: -.04em; line-height: 1.2; overflow-wrap: anywhere; }
.calculator-result p { font-size: 1rem; line-height: 1.6; }
.error { color: #ffb5a6; font-size: 1rem; margin-top: 1rem; }
[aria-invalid="true"] { border-color: #ffb5a6 !important; }
.connection-map { padding: clamp(1rem, 3vw, 2rem); margin-block: 2rem; border: 1px solid var(--line); background: #0d161c; }
.tree-root { max-width: 34rem; padding: 1.5rem; margin-inline: auto; border: 1px solid #8ea8a1; background: #20372f; color: var(--white); font-size: 1.4rem; font-weight: 650; line-height: 1.45; text-align: center; }
.tree-branches { position: relative; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .75rem; padding-top: 2rem; }
.tree-branches button { position: relative; min-width: 0; padding: 1rem .7rem; border: 1px solid #526a74; background: #111e27; font-size: .92rem; line-height: 1.45; }
.tree-branches button::before { content: ""; position: absolute; bottom: 100%; left: 50%; width: 1px; height: 2rem; background: #526a74; }
.tree-branches button:hover { background: #243b43; }
.tree-branches button[aria-pressed="true"] { background: var(--teal); border-color: var(--teal); color: var(--night); }
.node-detail { padding: 1.6rem; border-left: 2px solid var(--teal); background: #192a31; margin-block: 1.5rem; }
.node-detail h3 { margin-bottom: 1rem; }
.node-detail a { display: inline-block; margin-top: 1rem; }
.glossary { max-width: 58rem; padding-block: 2rem var(--space); }
.glossary dl { margin: 0; }
.glossary dt { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--line); font-weight: 650; font-size: 1.5rem; color: var(--white); }
.glossary dd { margin: .7rem 0 0; }
.site-footer { margin-top: var(--space); padding-block: 4rem 2rem; background: var(--deep); border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 4rem; }
.footer-grid > * { min-width: 0; }
.footer-grid h2 { font-size: 2rem; margin-bottom: 1rem; max-width: 21ch; }
.footer-grid p { color: var(--muted); font-size: .95rem; }
.footer-grid .eyebrow { color: var(--gold); font-size: .7rem; }
.footer-grid nav { display: grid; gap: .55rem; align-content: start; font-size: .95rem; }
.footer-note { border-top: 1px solid var(--line); padding-top: 1.5rem; margin-top: 2.5rem; padding-right: 7rem; font-size: .8rem; color: var(--muted); }
.site-footer .back-top { display: inline-flex; align-items: center; margin-top: 1rem; right: 1.1rem; bottom: 1rem; z-index: 15; padding: .6rem 1rem; min-height: 44px; background: #16252ded; border: 1px solid #58717c; color: var(--white); font-size: .82rem; text-decoration: none; box-shadow: 0 .3rem 1rem #0003; }
.site-footer .back-top.is-floating { position: fixed; margin-top: 0; }
.site-footer .back-top:hover { background: #2a424a; color: var(--gold); }

@media (min-width: 1150px) {
  .path-copy { display: grid; grid-template-columns: 1fr 1.25fr; gap: .8rem 3rem; }
  .path-copy h3 { margin: 0; }
  .path-copy ul { grid-column: 1 / -1; margin-bottom: 0; columns: 2; column-gap: 3rem; }
  .path-copy li { break-inside: avoid; margin-bottom: .5rem; }
}
@media (max-width: 1150px) {
  .wrap { width: calc(100% - 4rem); }
  .main-nav > a { display: none; }
  .main-nav { gap: 0; }
  .reading-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 3rem; }
  .hero-home h1 { font-size: clamp(3.9rem, 8vw, 6rem); }
  .tree-branches { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .tree-branches button::before { display: none; }
}
@media (max-width: 780px) {
  html { scroll-padding-top: 6rem; }
  .wrap { width: calc(100% - 2.5rem); }
  .site-header > .wrap { min-height: 76px; gap: .8rem; }
  .brand-words { font-size: .86rem; }
  .brand-mark { flex-basis: 34px; width: 34px; height: 34px; }
  .main-nav summary { font-size: .85rem; gap: .7rem; padding-inline: .65rem; }
  .hero-home { min-height: 780px; justify-content: flex-start; }
  .hero-content { padding-block: 4rem 7rem; }
  .hero-home h1 { font-size: clamp(3.7rem, 11vw, 5.8rem); }
  .hero-home .eyebrow { max-width: 28rem; }
  .hero-media img { object-position: 63% center; }
  .hero-shade { background: linear-gradient(90deg, #070d13e0, #09121c75), linear-gradient(0deg, #0b1116f2, transparent 45%, #0b111640); }
  .hero-intro { max-width: 30rem; font-size: 1.2rem; }
  .hero-detail { max-width: 28rem; }
  .hero-caption { bottom: 1.4rem; font-size: .71rem; }
  .section-heading, .intro-grid, .split-feature { grid-template-columns: 1fr; gap: 1.8rem; }
  .choice-grid { grid-template-columns: 1fr; }
  .choice-grid article { padding: 2rem 0; }
  .choice-grid article + article { border-left: 0; border-top: 1px solid #56766e; padding: 2rem 0; }
  .choice-bridge > p { font-size: 1.15rem; }
  .choice-axis { display: grid; gap: 1rem; }
  .choice-axis span + span::before { margin-right: 1rem; }
  .intro-grid { padding-block: 3rem; }
  .path-list article { grid-template-columns: 2.8rem minmax(0, 1fr); gap: .9rem; }
  .path-number { font-size: 2.2rem; }
  .path-list article > a { grid-column: 2; }
  .page-head { padding-block: 1.6rem 3rem; }
  .breadcrumb { margin-bottom: 2.2rem; }
  .page-head h1 { font-size: clamp(2.65rem, 7.5vw, 4.6rem); }
  .page-head.page-hero { min-height: 590px; }
  .page-hero .hero-content { padding-block: 2rem 7rem; }
  .page-hero .lede { font-size: 1.2rem; }
  .page-hero .hero-shade { background: linear-gradient(90deg, #080e16eb, #0a111899), linear-gradient(0deg, #0b1116f5, transparent 60%); }
  .reading-layout { display: block; padding-top: 2rem; }
  .on-this-page { position: static; max-height: none; padding: 1.3rem; margin-bottom: 2.5rem; border: 1px solid var(--line); background: var(--panel); }
  .prose { max-width: 100%; font-size: 1.125rem; }
  .prose h2 { font-size: 2rem; }
  .prose .chapter { margin-bottom: 3.5rem; }
  .page-nav { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 1.2rem .8rem; }
  .page-nav > a { padding: 1.1rem; }
  .page-title { font-size: 1rem; }
  .page-direction { font-size: .65rem; letter-spacing: .07em; }
  .page-position { grid-column: 1 / -1; grid-row: 2; flex-direction: row; gap: 1rem; align-items: center; }
  .project-grid, .library-tools { grid-template-columns: 1fr; }
  .image-credit-grid { grid-template-columns: 1fr; }
  .project-grid article { padding: 1.4rem; }
  .tool-panel { padding: 1.4rem; }
  .tree-branches { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 480px) {
  .wrap { width: calc(100% - 2rem); }
  .brand { gap: .45rem; }
  .brand-words { font-size: .79rem; }
  .brand-mark { flex-basis: 31px; width: 31px; height: 31px; }
  .main-nav summary { font-size: .79rem; }
  .hero-home { min-height: 790px; }
  .hero-content { padding-block: 3rem 7.5rem; }
  .hero-home h1 { font-size: clamp(3.25rem, 13.8vw, 4.5rem); }
  .hero-home .eyebrow { font-size: .66rem; max-width: 28ch; }
  .hero-intro { font-size: 1.13rem; }
  .hero-detail { font-size: .95rem; }
  .hero-home .actions { flex-direction: column; align-items: flex-start; margin-top: 1.6rem; }
  .hero-home .button { font-size: .87rem; }
  h2 { font-size: 2.1rem; }
  .eyebrow { font-size: .71rem; }
  .section-heading { margin-bottom: 2rem; }
  .page-head h1 { font-size: 2.65rem; }
  .page-hero .hero-caption { font-size: .68rem; }
  .page-head.page-hero { min-height: 610px; }
  .control-grid { grid-template-columns: 1fr; }
  .calculator-result { padding: 1.2rem; }
  .calculator-result output { font-size: 2.3rem; }
  .tree-root { padding: 1rem; font-size: 1.15rem; }
  .tree-branches { grid-template-columns: 1fr; }
  .tree-branches button { min-height: 48px; padding: .65rem; }
  .node-detail { padding: 1.2rem; }
  .footer-note { padding-right: 0; padding-bottom: 3.5rem; }
  .site-footer .back-top { right: .8rem; bottom: .75rem; padding: .5rem .7rem; font-size: .76rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}
@media print {
  :root { color-scheme: light; }
  html, body { background: white; color: black; font-size: 11pt; }
  .wrap { width: 100%; max-width: none; }
  .site-header, .skip-link, .on-this-page, .page-nav, .site-footer, .library-tools, .preset-buttons, .tree-branches, .hero-media, .hero-shade, .hero-caption { display: none !important; }
  h1, h2, h3, h4, strong, a, .hero-home h1 span { color: black !important; }
  h1, .hero-home h1, .page-head h1 { font-size: 34pt; }
  h2 { font-size: 24pt; break-after: avoid; }
  h3 { font-size: 17pt; }
  p, li { orphans: 3; widows: 3; }
  p, li, dd { color: #222 !important; }
  a { text-decoration: underline; }
  .hero, .page-head.page-hero, .page-head, .hero-content { min-height: 0; background: white; padding: 0 0 15pt; margin: 0; }
  .hero::after, .page-hero::after { display: none; }
  .hero-intro, .hero-detail, .lede, .eyebrow, .ref-meta, .source-note { color: #333 !important; }
  .intro-grid, .section-heading, .choice-grid, .split-feature, .reading-layout, .project-grid, .footer-grid { display: block; padding: 0; }
  .choice-grid article, .choice-grid article + article { padding: 15pt 0; border-left: 0; background: white; }
  .choice-axis { color: black; }
  .prose { max-width: none; font-size: 11pt; }
  .feature-strip, .tool-panel, .connection-map, .node-detail, .calculator-result, .project-grid article { background: white; color: black; border-color: #888; padding: 14pt; }
  .calculator-result output { color: black; font-size: 24pt; }
  .feature-strip, .node-detail, figure { break-inside: avoid; }
  .media-wide { max-width: 150mm; margin: 18pt auto; }
  .media-wide img { max-height: 100mm; width: auto; margin-inline: auto; }
  figcaption { color: #333; font-size: 9pt; }
  .node-detail[hidden], .reference-list article[hidden], .project-grid article[hidden] { display: block !important; }
  .tree-root { background: white; color: black; border-color: #888; }
  .button { background: white !important; color: black !important; border-color: #888; }
  main > section + section { margin-top: 24pt; }
}