/* Biotwin: light editorial. White page, ink text, one burnt orange accent, Literata headings with Figtree text. */
:root {
  --bg: #ffffff; --soft: #faf7f4; --soft-2: #f3ede7; --ink: #1c1917; --ink-2: #4a4440; --ink-3: #78716c;
  --line: #ebe5df; --accent: #c2410c; --accent-ink: #9a3412; --accent-soft: #fdf0e8;
  --serif: 'Literata', Georgia, serif; --sans: 'Figtree', system-ui, -apple-system, 'Segoe UI', sans-serif;
}
html { color-scheme: light; -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-ink); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -9999px; } .skip:focus { left: 16px; top: 12px; z-index: 99; background: var(--ink); color: #fff; padding: 10px 14px; border-radius: 8px; }
.wrap { max-width: 1160px; margin: 0 auto; padding-left: max(20px, env(safe-area-inset-left)); padding-right: max(20px, env(safe-area-inset-right)); }
.narrow { max-width: 780px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; line-height: 1.2; text-wrap: balance; color: var(--ink); }
h1 { font-size: clamp(2rem, 4.4vw, 3.1rem); margin: 0 0 16px; line-height: 1.12; }
h2 { font-size: clamp(1.45rem, 2.6vw, 1.85rem); margin: 0 0 12px; }
h3 { font-size: 1.2rem; margin: 0 0 8px; }
.eyebrow, .kick { font: 600 13px/1.2 var(--sans); letter-spacing: .05em; text-transform: uppercase; color: var(--accent); margin: 0 0 10px; }
.kick a { text-decoration: none; }
.lede { font-size: clamp(1.08rem, 1.6vw, 1.22rem); color: var(--ink-2); max-width: 62ch; margin: 0; }
.meta { color: var(--ink-3); font-size: 14px; margin: 0; }
.btn { display: inline-flex; align-items: center; min-height: 46px; padding: 0 22px; border-radius: 999px; background: var(--accent); color: #fff; font: 600 16px/1 var(--sans); text-decoration: none; border: 1px solid var(--accent); }
.btn:hover { background: var(--accent-ink); color: #fff; }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line); } .btn-ghost:hover { background: var(--soft); color: var(--ink); }
.btn-sm { min-height: 38px; padding: 0 16px; font-size: 15px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }

.top { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.95); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font: 700 21px/1 var(--serif); }
.brand .mark { width: 30px; height: 30px; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a:not(.btn) { color: var(--ink-2); text-decoration: none; font-weight: 500; font-size: 15.5px; }
.nav a:not(.btn):hover, .nav a[aria-current] { color: var(--ink); }
.nav a[aria-current]:not(.btn) { box-shadow: inset 0 -2px 0 var(--accent); }
.menu { display: none; position: relative; }
.menu summary { list-style: none; cursor: pointer; width: 44px; height: 44px; display: grid; place-content: center; gap: 5px; border: 1px solid var(--line); border-radius: 12px; }
.menu summary::-webkit-details-marker { display: none; }
.menu summary span { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }
.menu nav { position: absolute; right: 0; top: 54px; background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 18px 40px -22px rgba(28,25,23,.4); padding: 8px; min-width: 210px; display: grid; }
.menu nav a { padding: 12px 14px; border-radius: 10px; color: var(--ink); text-decoration: none; font-weight: 500; }
.menu nav a:hover { background: var(--soft); }

.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 18px 0 0; margin: 0; font-size: 14px; color: var(--ink-3); }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: #cfc6be; }
.crumbs a { color: var(--ink-2); text-decoration: none; } .crumbs a:hover { color: var(--accent); }
.crumbs [aria-current] { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 52ch; }

.hero { padding: 72px 0 40px; background: linear-gradient(180deg, var(--soft) 0%, #fff 100%); border-bottom: 1px solid var(--line); }
.hero h1 { max-width: 20ch; font-size: clamp(2.2rem, 5vw, 3.6rem); }
.section { padding: 56px 0; } .section.tight { padding: 32px 0 64px; }
.band { background: var(--soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.shead { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; }
.shead h2 { margin: 0; } .shead a { font-weight: 600; font-size: 15px; text-decoration: none; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; }
.card { position: relative; display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; transition: box-shadow .2s, border-color .2s; }
.card:hover { border-color: #e0d5cb; box-shadow: 0 16px 36px -26px rgba(28,25,23,.5); }
.thumb { display: block; aspect-ratio: 16 / 9; background: var(--soft-2); overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb.ph { display: grid; place-items: center; text-decoration: none; background: linear-gradient(135deg, var(--accent-soft), var(--soft-2)); }
.thumb.ph span { font: 600 1.4rem/1 var(--serif); color: var(--accent-ink); }
.card-b { padding: 20px 22px 22px; display: flex; flex-direction: column; flex: 1; }
.card h3 { font-size: 1.16rem; } .card h3 a { color: var(--ink); text-decoration: none; } .card h3 a::after { content: ""; position: absolute; inset: 0; }
.card-b > p:not(.kick):not(.meta) { color: var(--ink-2); font-size: 15.5px; margin: 0 0 14px; flex: 1; }
.lead-row { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; align-items: start; }
.lead-row > .card h3 { font-size: 1.6rem; }
.side { display: grid; gap: 0; }
.mini { padding: 18px 0; border-bottom: 1px solid var(--line); } .mini:first-child { padding-top: 0; }
.mini h3 { font-size: 1.1rem; margin-bottom: 6px; } .mini h3 a { color: var(--ink); text-decoration: none; } .mini h3 a:hover { color: var(--accent); }
.cta { text-align: center; max-width: 640px; } .cta p { color: var(--ink-2); } .cta .actions { justify-content: center; }

.page-head { padding: 32px 0 28px; border-bottom: 1px solid var(--line); }
.page-head .meta { margin-top: 12px; }
.topics { display: grid; gap: 0; }
.topic { display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.topic p { color: var(--ink-2); } .topic ul { margin: 0; padding-left: 20px; } .topic li { margin: 6px 0; }
details { border: 1px solid var(--line); border-radius: 14px; margin: 10px 0; background: #fff; }
summary { cursor: pointer; padding: 16px 52px 16px 20px; list-style: none; position: relative; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); font-size: 22px; color: var(--accent); }
details[open] summary::after { content: "\2212"; }
summary h2 { font-size: 1.08rem; margin: 0; font-family: var(--sans); font-weight: 600; }
details > div { padding: 0 20px 16px; color: var(--ink-2); }
.note { color: var(--ink-2); }

.art-head { max-width: 860px; padding-top: 22px; padding-bottom: 8px; }
.dek { font-size: 1.18rem; color: var(--ink-2); margin: 0 0 18px; }
.byline { color: var(--ink-3); font-size: 14.5px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 12px 0; margin: 0 0 24px; }
.byline a { color: var(--ink); font-weight: 600; text-decoration: none; }
.hero-img { margin: 0 0 12px; } .hero-img img { width: 100%; border-radius: 16px; aspect-ratio: 16 / 9; object-fit: cover; background: var(--soft-2); }
.art-grid { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 52px; align-items: start; padding-top: 20px; padding-bottom: 56px; }
.toc { position: sticky; top: 92px; font-size: 14.5px; border-left: 2px solid var(--line); padding-left: 16px; }
.toc p { font: 600 12.5px/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 12px; }
.toc ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 9px; } .toc a { color: var(--ink-2); text-decoration: none; line-height: 1.35; display: block; } .toc a:hover { color: var(--accent); }
.prose { max-width: 740px; min-width: 0; }
.prose h2 { margin-top: 44px; } .prose h3 { margin-top: 28px; }
.prose p, .prose li { color: #2b2622; }
.prose img { border-radius: 14px; margin: 18px 0; }
.prose blockquote { margin: 26px 0; padding: 16px 20px; background: var(--soft); border-left: 4px solid var(--accent); border-radius: 0 12px 12px 0; }
.prose blockquote p { margin: 0; }
.prose pre { background: var(--soft); padding: 16px; border-radius: 12px; overflow-x: auto; font-size: 14px; }
.prose code { background: var(--soft); padding: 2px 6px; border-radius: 6px; font-size: .9em; }
.prose pre code { background: none; padding: 0; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 36px 0; }
.table-wrap { overflow-x: auto; margin: 24px 0; border: 1px solid var(--line); border-radius: 12px; }
table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 520px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--soft); font-weight: 600; } tbody tr:last-child td { border-bottom: 0; }

.foot { background: var(--soft); border-top: 1px solid var(--line); padding: 52px 0 26px; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; }
.foot p { color: var(--ink-2); font-size: 15px; max-width: 42ch; }
.foot h2 { font: 600 12.5px/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); margin: 6px 0 14px; }
.foot-grid a:not(.brand) { display: block; color: var(--ink-2); text-decoration: none; font-size: 15px; margin: 8px 0; } .foot-grid a:not(.brand):hover { color: var(--accent); }
.fine { border-top: 1px solid var(--line); margin-top: 32px; padding-top: 18px; font-size: 13.5px; color: var(--ink-3); }

@media (max-width: 1000px) { .art-grid { grid-template-columns: 1fr; gap: 0; } .toc { display: none; } .foot-grid { grid-template-columns: 1fr 1fr; } .foot-grid > div:first-child { grid-column: 1 / -1; } }
@media (max-width: 860px) { .nav { display: none; } .menu { display: block; } .grid, .lead-row, .topic { grid-template-columns: 1fr; gap: 22px; } .hero { padding: 44px 0 32px; } }
@media (max-width: 520px) { body { font-size: 16.5px; } .foot-grid { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { .card { transition: none; } }
.grid > *, .lead-row > *, .side > * { min-width: 0; }

.art-grid.art-top { padding-top: 0; padding-bottom: 0; }
@media (max-width: 1000px) { .toc-spacer { display: none; } }