/* Product page only. */

.product-hero { background: radial-gradient(ellipse 90% 80% at 70% 40%, #17263D 0%, #0F1B2D 45%, #0A1220 80%, #070D17 100%); }
.product-hero h1 { max-width: 13em; }
.product-hero .lede { max-width: 34em; }

/* sticky chapter sub-nav */
.subnav { position: sticky; top: 0; z-index: 50; background: rgba(9, 16, 28, 0.82); backdrop-filter: saturate(1.4) blur(18px); -webkit-backdrop-filter: saturate(1.4) blur(18px); box-shadow: 0 1px 0 var(--night-line), 0 -1px 0 var(--night-line); transition: top 0.45s var(--ease-out); }
.subnav { top: var(--nav-offset, var(--nav-h)); }
.subnav ol { list-style: none; margin: 0; padding: 0; display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.subnav ol::-webkit-scrollbar { display: none; }
.subnav li { flex: 1 0 auto; }
.subnav a { position: relative; display: flex; align-items: center; justify-content: center; gap: 8px; height: 56px; padding: 0 14px; color: var(--fog); font-weight: 500; font-size: 0.94rem; white-space: nowrap; transition: color 0.25s; }
.subnav a::after { content: ''; position: absolute; left: 14px; right: 14px; bottom: 0; height: 2px; background: var(--sky); transform: scaleX(0); transform-origin: left; transition: transform 0.5s var(--ease-out); }
.subnav a:hover { color: var(--cream); }
.subnav a.active { color: var(--cream); }
.subnav a.active::after { transform: none; }

/* chapter openers */
.chapter-open { position: relative; overflow: hidden; padding: clamp(96px, 12vw, 160px) 0 clamp(64px, 8vw, 104px); }
.chapter-open .wrap { position: relative; z-index: 2; }
.chapter-open .num { font-family: var(--title); font-style: italic; font-size: 1.35rem; color: var(--sky); margin-bottom: 18px; }
.chapter-open h2 { font-size: clamp(2.8rem, 6.4vw, 5.6rem); line-height: 1; letter-spacing: -0.02em; max-width: 11em; }
.chapter-open .lede { margin-top: 26px; max-width: 34em; }
.chapter-art { position: absolute; top: 0; bottom: 0; right: max(0px, calc((100vw - 1440px) / 2)); width: min(38vw, 480px); pointer-events: none; z-index: 1; }
.chapter-art img { position: absolute; right: 0; top: 50%; height: 130%; width: auto; max-width: none; transform: translateY(-50%); -webkit-mask-image: linear-gradient(90deg, transparent, #000 45%); mask-image: linear-gradient(90deg, transparent, #000 45%); }
@media (max-width: 900px) { .chapter-art { opacity: 0.3; width: 70vw; } }

.chapter-body { padding-bottom: clamp(110px, 14vw, 180px); }
.chapter-body.night-deep, .chapter-open.night-deep { background: var(--night-0); }

.feature-text .num-sm { font-size: 0.92rem; color: var(--fog); margin-bottom: 14px; }
.feature-text .accent { font-size: 0.82em; margin-top: 4px; }

/* closing trust band */
.checked { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(40px, 6vw, 88px); align-items: start; }
.checked .grid { --g: 18px; }
.checked .card h3 { font-size: 1.4rem; }
@media (max-width: 900px) { .checked { grid-template-columns: 1fr; } }

.product-pixels { --px: 14px; --gap: 6px; --cols: 11; right: max(var(--gutter), calc((100vw - 1400px) / 2)); top: calc(var(--nav-h) + 40px); }
@media (max-width: 760px) { .product-pixels { --px: 9px; --gap: 4px; top: calc(var(--nav-h) + 8px); opacity: 0.6; } }
.chapter-art { -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 22%, #000 70%, transparent 100%); mask-image: linear-gradient(180deg, transparent 0%, #000 22%, #000 70%, transparent 100%); }

/* ================================================================== hub + subpages (product/) */
/* breadcrumbs */
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 30px; font-size: 0.92rem; color: var(--fog); }
.crumbs a { color: var(--mist); transition: color 0.2s; }
.crumbs a:hover { color: var(--cream); }
.crumbs .sep { color: var(--night-line-strong); }
.crumbs [aria-current] { color: var(--cream); }

/* hub hero chips */
.hub-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 44px; }
.hub-nav a { display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 18px; border-radius: 999px; font-size: 0.94rem; font-weight: 500; color: var(--mist); box-shadow: inset 0 0 0 1px var(--night-line-strong); transition: color 0.2s, box-shadow 0.2s, background 0.2s; }
.hub-nav a:hover { color: var(--cream); box-shadow: inset 0 0 0 1px var(--sky); background: rgba(142, 219, 255, 0.06); }

/* hub groups: text + links on one side, one clip or chapter art on the other */
.group .anchor-alias { position: absolute; top: 0; }
.group-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(36px, 6vw, 88px); align-items: center; }
.group-grid.flip .group-text { order: 2; }
.group-text .num { font-family: var(--title); font-style: italic; font-size: 1.3rem; color: var(--sky); margin-bottom: 14px; }
.group-text h2 { font-size: clamp(2.3rem, 4.4vw, 3.8rem); line-height: 1.02; letter-spacing: -0.015em; }
.group-text .lede { margin-top: 20px; font-size: 1.08rem; }
.glinks { margin-top: 30px; display: grid; gap: 10px; }
.glink { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 18px 20px; border-radius: 14px; background: rgba(23, 38, 61, 0.55); box-shadow: inset 0 0 0 1px var(--night-line); transition: box-shadow 0.3s, background 0.3s, transform 0.4s var(--ease-out); }
.glink:hover { box-shadow: inset 0 0 0 1px var(--sky); background: rgba(23, 38, 61, 0.85); transform: translateX(4px); }
.glink b { display: block; color: var(--cream); font-weight: 600; }
.glink-text > span { display: block; color: var(--fog); font-size: 0.92rem; margin-top: 2px; }
.glink .arrow { color: var(--sky); flex: none; transition: transform 0.35s var(--ease-out); }
.glink:hover .arrow { transform: translateX(4px); }
.group-art { position: relative; aspect-ratio: 1260 / 924; display: grid; place-items: center; overflow: hidden; }
.group-art img { width: 100%; height: 100%; object-fit: contain; }
@media (max-width: 900px) { .group-grid { grid-template-columns: 1fr; } .group-grid.flip .group-text { order: 0; } .group-art { aspect-ratio: 16 / 10; } }

/* subpages */
.sub-hero h1 { font-size: clamp(2.5rem, 5.2vw, 4.4rem); max-width: 14em; }
.sub-hero .lede { max-width: 36em; }
.sub-body { padding: clamp(88px, 11vw, 150px) 0 clamp(110px, 13vw, 170px); }
.spec-panel { border-radius: var(--radius-lg); padding: clamp(26px, 3vw, 36px); background: linear-gradient(180deg, rgba(23, 38, 61, 0.7), rgba(15, 27, 45, 0.55)); box-shadow: inset 0 0 0 1px var(--night-line); }
.spec-title { font-weight: 600; color: var(--cream); margin-bottom: 14px; }
.spec-panel ul { list-style: none; margin: 0; padding: 0; }
.spec-panel li { display: grid; grid-template-columns: minmax(0, 2fr) minmax(0, 3fr); gap: 16px; padding: 16px 0; border-top: 1px solid var(--night-line); }
.spec-panel li b { font-family: var(--title); font-weight: 400; font-size: 1.3rem; line-height: 1.2; color: var(--cream); }
.spec-panel li span { color: var(--mist); font-size: 0.96rem; }
@media (max-width: 520px) { .spec-panel li { grid-template-columns: 1fr; gap: 4px; } }

/* how it works */
.how-title { margin-bottom: clamp(40px, 5vw, 64px); max-width: 16em; }
.how { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(var(--n, 4), minmax(0, 1fr)); gap: 24px; }
.how li { position: relative; padding-top: 22px; border-top: 2px solid var(--paper-ink); }
.how h3 { font-size: 1.45rem; margin-bottom: 10px; }
.how p { color: var(--paper-body); font-size: 0.98rem; }
@media (max-width: 980px) { .how { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .how { grid-template-columns: 1fr; } }

/* related */
.rel-card { min-height: 100%; }
.rel-card .rel-kicker { font-size: 0.86rem; color: var(--fog); margin-bottom: 10px; }
.rel-card h3 { font-size: 1.5rem; }

/* case study band */
.proof-band { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(40px, 6vw, 88px); align-items: center; }
.proof-stats { display: grid; gap: 28px; }
.proof-stats .stat-num { font-size: clamp(2.6rem, 4.4vw, 3.8rem); }
@media (max-width: 900px) { .proof-band { grid-template-columns: 1fr; } .proof-stats { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px) { .proof-stats { grid-template-columns: 1fr; } }

/* document naming figures */
.calc { margin: 0; padding: clamp(26px, 3.4vw, 40px); border-radius: var(--radius-lg); background: linear-gradient(180deg, rgba(23, 38, 61, 0.7), rgba(15, 27, 45, 0.55)); box-shadow: inset 0 0 0 1px var(--night-line); }
.calc-row { display: grid; grid-template-columns: 1.6em minmax(0, 0.9fr) minmax(0, 1.6fr); gap: 14px; align-items: baseline; padding: 12px 0; }
.calc-row.total { border-top: 1px solid var(--night-line-strong); }
.calc-op { color: var(--fog); font-size: 1.4rem; text-align: center; }
.calc-n { font-family: var(--title); font-size: clamp(1.8rem, 3vw, 2.5rem); line-height: 1; color: var(--cream); font-variant-numeric: lining-nums tabular-nums; }
.calc-row.total .calc-n { color: var(--sky); }
.calc-l { color: var(--mist); }
.calc.result { text-align: center; }
.calc-big { font-family: var(--title); font-size: clamp(5rem, 11vw, 8.5rem); line-height: 1; color: var(--sky); letter-spacing: -0.03em; }
.calc.result .calc-l { font-size: 1.15rem; color: var(--cream); margin-top: 10px; }
.calc-note { margin-top: 16px; color: var(--fog); font-size: 0.92rem; }
@media (max-width: 520px) { .calc-row { grid-template-columns: 1.4em 1fr; } .calc-l { grid-column: 2; } }

/* area crumb on feature pages: opens the area's other pages (generated by tools/ia.py) */
.crumb-menu { position: relative; z-index: 5; }
.crumb-menu > button { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; margin: -4px -4px; border-radius: 999px; font: inherit; color: var(--mist); box-shadow: inset 0 0 0 1px var(--night-line); transition: color 0.2s, box-shadow 0.2s; }
.crumb-menu > button:hover, .crumb-menu[data-open='true'] > button { color: var(--cream); box-shadow: inset 0 0 0 1px var(--night-line-strong); }
.crumb-menu .caret { transition: transform 0.3s var(--ease-out); }
.crumb-menu[data-open='true'] .caret { transform: rotate(180deg); }
.crumb-list { position: absolute; top: calc(100% + 10px); left: -8px; min-width: 240px; display: grid; padding: 8px; border-radius: 14px; background: var(--night-2); border: 1px solid var(--night-line); box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.7); opacity: 0; visibility: hidden; transform: translateY(-4px); transition: opacity 0.2s, transform 0.3s var(--ease-out), visibility 0.2s; }
.crumb-menu[data-open='true'] .crumb-list { opacity: 1; visibility: visible; transform: none; }
.crumb-menu[data-open='true'] > button::after { content: ''; position: absolute; left: 0; right: 0; top: 100%; height: 12px; }
.crumb-list a { padding: 9px 12px; border-radius: 9px; color: var(--mist); font-size: 0.95rem; white-space: nowrap; }
.crumb-list a:hover { background: rgba(255, 255, 255, 0.05); color: var(--cream); }
.crumb-list a[aria-current] { color: var(--cream); font-weight: 600; }
.crumb-list .crumb-all { margin-top: 4px; padding-top: 12px; border-top: 1px solid var(--night-line); border-radius: 0 0 9px 9px; color: var(--sky); font-weight: 600; }