*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1rem; }
body { margin: 0; }
main, header, footer, section, article, aside, div { min-width: 0; }
.shell { width: min(100% - 6rem, 74rem); margin-inline: auto; }
.stack > * { margin-block: 0; }
.stack > * + * { margin-block-start: 1.15rem; }
.cluster { display: flex; align-items: center; flex-wrap: wrap; gap: 1rem; }
.measure { max-width: 66ch; }
.site-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding-block: 1.4rem; }
.identity { display: flex; align-items: center; gap: .7rem; min-height: 48px; }
.identity-mark { flex: 0 0 1.6rem; width: 1.6rem; height: 1.6rem; position: relative; }
.identity-mark::before, .identity-mark::after { content: ''; position: absolute; inset: 1px; border-radius: 50%; }
.identity-mark::after { inset: 5px -4px 5px 6px; }
.jump-link { display: inline-flex; justify-content: center; align-items: center; gap: .8rem; min-height: 48px; padding: .4rem .8rem; }
.skip-link { position: absolute; top: .4rem; left: .4rem; z-index: 10; padding: .65rem 1rem; min-height: 48px; transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.hero { position: relative; display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(15rem, .75fr); gap: 3rem; align-items: center; padding-block: 4.3rem 4.8rem; }
.hero-copy { position: relative; z-index: 1; max-width: 45rem; }
.hero-copy h1 { margin-block: 1.3rem 1.5rem; }
.hero-copy .lead { max-width: 50ch; }
.geometry { width: 100%; aspect-ratio: 1; position: relative; display: grid; place-items: center; }
.geometry .veil { position: absolute; width: 91%; height: 91%; border-radius: 50%; }
.orbit { position: absolute; width: 90%; height: 57%; border-radius: 50%; transform: rotate(-34deg); }
.orbit-b { width: 68%; height: 89%; transform: rotate(38deg); }
.orbit-c { width: 48%; height: 70%; transform: rotate(-12deg); }
.seed { width: 24%; height: 24%; border-radius: 50%; position: relative; }
.geometry::after { content: ''; position: absolute; height: 1px; width: 105%; transform: rotate(-34deg); }
.home .geometry { max-width: 24rem; justify-self: end; }
.inside .hero { grid-template-columns: minmax(0, 1.6fr) minmax(10rem, .4fr); padding-block: 3.6rem 3.8rem; }
.inside .geometry { max-width: 13rem; justify-self: end; }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 21rem); column-gap: 5rem; padding-block: 0 5rem; align-items: start; }
.card-body { display: grid; gap: 2.5rem; grid-column: 1 / -1; max-width: 66ch; }
.home .card-body, .depth .card-body { max-width: none; grid-template-columns: minmax(0, 1fr) minmax(0, 21rem); column-gap: 5rem; align-items: start; }
.card-body > .reading-section { max-width: 66ch; }
.home .card-body > .reading-section, .depth .card-body > .reading-section, .depth .card-body > .term-note, .home .card-body > .route-grid { grid-column: 1; }
.home .card-body > .summary-card, .depth .card-body > .summary-card { grid-column: 1; }
.home .card-body > .evidence-card, .depth .card-body > .evidence-card { grid-column: 2; }
.home .card-body > .evidence-top, .depth .card-body > .evidence-top { grid-row: 1 / span 2; }
.summary-card, .term-note, .evidence-card, .compare-panel { padding: 1.65rem; }
.summary-card p { max-width: 66ch; }
.term-note { margin: 0; display: grid; gap: .7rem; }
.term-note dd { margin: 0; }
.question-list { padding-left: 1.25rem; margin-block: 0; }
.question-list li + li { margin-top: .75rem; }
.source-link { display: flex; align-items: center; justify-content: space-between; gap: .9rem; min-height: 48px; padding-block: .45rem; }
.route-grid, .comparison-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.route-card { display: flex; position: relative; flex-direction: column; gap: .8rem; padding: 1.4rem 2.75rem 1.4rem 1.4rem; min-height: 9rem; }
.arrow { position: absolute; bottom: 1.25rem; right: 1.25rem; }
.compare-controls { margin-block: .5rem 1.4rem; }
.compare-controls button { min-height: 48px; padding: .7rem 1rem; }
.compare-status { margin: .7rem 0 0; }
[hidden] { display: none !important; }
.journey { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; padding-block: 1.5rem 2.5rem; }
.journey a { display: inline-flex; align-items: center; gap: .8rem; min-height: 48px; padding: .5rem 0; }
.site-footer { padding-block: 3.8rem 2.3rem; }
.directory-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.6rem; }
.directory-head p { margin: 0; }
.directory-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2rem; }
.directory-label { margin: 0 0 1rem; }
.directory-grid ul { padding: 0; margin: 0; list-style: none; }
.directory-grid a { display: flex; align-items: center; min-height: 48px; padding-block: .5rem; }
.footer-line { max-width: 70ch; margin-top: 3rem; padding-top: 1.8rem; }
.back-top { display: inline-flex; align-items: center; gap: .5rem; min-height: 48px; }
@media (max-width: 1000px) {
 .shell { width: min(100% - 3rem, 74rem); }
 .hero { gap: 1.5rem; }
 .content-grid, .home .card-body, .depth .card-body { column-gap: 2rem; grid-template-columns: minmax(0, 1fr) minmax(0, 18rem); }
 .directory-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
 .shell { width: calc(100% - 2.5rem); }
 .site-head { padding-block: .9rem; }
 .identity { gap: .45rem; }
 .jump-link { gap: .35rem; padding-inline: .35rem; }
 .hero, .inside .hero { grid-template-columns: minmax(0, 1fr); padding-block: 2.5rem 2.7rem; gap: 1.3rem; }
 .home .hero { padding-bottom: 2rem; }
 .home .geometry { width: 12rem; justify-self: center; }
 .inside .geometry { display: none; }
 .hero-copy h1 { margin-block: 1rem 1.25rem; }
 .content-grid, .home .card-body, .depth .card-body { display: block; }
 .content-grid { padding-bottom: 2.5rem; }
 .card-body > * + * { margin-top: 2rem; }
 .summary-card, .term-note, .evidence-card, .compare-panel { padding: 1.35rem; }
 .route-grid, .comparison-grid { grid-template-columns: minmax(0, 1fr); }
 .route-card { min-height: 8rem; }
 .directory-grid { gap: 2rem 1.1rem; }
 .directory-head { margin-bottom: 2rem; }
 .site-footer { padding-top: 2.8rem; }
 .journey { padding-bottom: 1.5rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }