@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Space+Grotesk:wght@400;500;600;700&display=swap');

:root {
  color-scheme: light; --paper: #f4f3ec; --white: #fffefa; --ink: #17211c; --forest: #19372e; --forest-deep: #112720;
  --muted: #6c7770; --line: #d8dcd2; --lime: #d8ee67; --orange: #ee7150; --sky: #bddbd2;
  --display: 'Space Grotesk', 'Trebuchet MS', sans-serif; --mono: 'DM Mono', 'Courier New', monospace; --page: 1240px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--display); font-size: 16px; line-height: 1.55; }
a { color: inherit; text-decoration: none; } button { color: inherit; font: inherit; } img { max-width: 100%; }
.page-width { width: min(var(--page), calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 50; top: 8px; left: 8px; transform: translateY(-150%); padding: 10px 14px; background: var(--lime); color: var(--ink); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; z-index: 20; top: 0; display: flex; height: 76px; align-items: center; justify-content: space-between; padding: 0 max(32px, calc((100vw - var(--page)) / 2)); background: var(--paper); border-bottom: 1px solid rgba(23,33,28,.1); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; white-space: nowrap; }
.brand-mark { display: grid; width: 31px; height: 31px; place-items: center; background: var(--forest); color: var(--lime); font-size: 18px; line-height: 1; }
.brand-light { margin-left: 5px; font-weight: 400; }
.primary-nav { display: flex; height: 100%; align-items: center; gap: clamp(18px, 3vw, 42px); }
.primary-nav > a { font-size: 13px; font-weight: 600; transition: color .2s ease; }
.primary-nav > a:hover, .primary-nav > a[aria-current="page"] { color: #476754; }
.primary-nav .nav-cta { display: inline-flex; min-height: 40px; align-items: center; gap: 8px; padding: 0 14px; border: 1px solid var(--ink); }
.nav-cta svg, .footer-links svg { width: 14px; height: 14px; }
.menu-toggle { display: none; width: 42px; height: 42px; align-items: center; justify-content: center; border: 1px solid var(--line); background: transparent; }
.menu-toggle svg { width: 20px; height: 20px; }
.eyebrow { margin: 0 0 18px; color: #64746b; font-family: var(--mono); font-size: 11px; line-height: 1.45; }
.light-eyebrow { color: rgba(255,255,255,.76); }
.status-dot { display: inline-block; width: 7px; height: 7px; margin: 0 8px 1px 0; border-radius: 50%; background: var(--lime); }
.home-hero { position: relative; display: flex; min-height: 570px; height: min(760px, calc(100svh - 76px)); align-items: center; overflow: hidden; background: var(--forest-deep); color: white; }
.hero-photo, .hero-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-photo { object-fit: cover; object-position: center 58%; animation: photo-in 1.1s ease both; }
.hero-shade { background: linear-gradient(90deg, rgba(13,31,24,.94), rgba(16,36,28,.78) 33%, rgba(18,38,30,.13) 72%), linear-gradient(0deg, rgba(12,28,22,.62), transparent 38%); }
.hero-content { position: relative; z-index: 1; padding-bottom: 52px; animation: rise-in .65s .08s both; }
.hero-content .eyebrow { margin-bottom: 24px; }
.home-hero h1, .page-hero h1 { max-width: 760px; margin: 0; font-size: 94px; font-weight: 500; line-height: .99; }
h1 em { color: var(--lime); font-style: normal; }
.hero-description { max-width: 475px; margin: 24px 0 0; color: rgba(255,255,255,.83); font-size: 17px; line-height: 1.6; }
.hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 32px; }
.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; gap: 12px; padding: 0 18px; font-size: 13px; font-weight: 700; transition: transform .2s ease, background-color .2s ease; }
.button:hover { transform: translateY(-2px); } .button svg, .text-link svg, .arrow-link svg { width: 16px; height: 16px; }
.button-lime { background: var(--lime); color: var(--ink); } .button-lime:hover { background: #e6f69a; }
.button-dark { background: var(--ink); color: var(--white); } .button-dark:hover { background: var(--forest); }
.text-link, .arrow-link { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; } .light-link { color: white; }
.hero-meta { position: absolute; z-index: 1; right: 0; bottom: 22px; left: 0; display: flex; gap: 28px; color: rgba(255,255,255,.82); font-family: var(--mono); font-size: 10px; }
.hero-meta span + span { padding-left: 28px; border-left: 1px solid rgba(255,255,255,.35); }
.image-credit { position: absolute; right: 20px; bottom: 60px; color: rgba(255,255,255,.72); font-family: var(--mono); font-size: 9px; }
.intro-band { padding: 98px 0 102px; background: var(--sky); }
.intro-layout { display: grid; grid-template-columns: 1fr 1.8fr 1fr; align-items: start; gap: 36px; }
.intro-layout .eyebrow { padding-top: 10px; }
.intro-layout h2, .section-heading h2, .backend-layout h2, .detail-heading h2, .setup-intro h2, .tools-layout h2, .commands-layout h2, .links-layout h2 { margin: 0; font-size: 54px; font-weight: 500; line-height: 1.05; }
.intro-layout h2 span { color: #5c776c; } .intro-copy p { margin: 0 0 20px; color: #3c5147; font-size: 15px; line-height: 1.7; }
.arrow-link { color: var(--forest); }
.system-section { padding-top: 94px; padding-bottom: 110px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 38px; }
.section-heading .eyebrow { margin-bottom: 14px; } .section-aside { max-width: 265px; margin: 0 0 4px; color: var(--muted); font-size: 14px; }
.system-grid { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.system-tile { position: relative; min-height: 265px; padding: 23px 20px 22px; border-right: 1px solid var(--line); transition: background-color .2s ease; }
.system-tile:first-child { border-left: 1px solid var(--line); } .system-tile:hover { background: var(--white); }
.tile-index { color: var(--muted); font-family: var(--mono); font-size: 10px; }
.system-tile > svg { display: block; width: 28px; height: 28px; margin-top: 31px; color: var(--forest); stroke-width: 1.6; }
.tile-render > svg { color: #c14f36; } .tile-physics > svg { color: #527764; } .tile-vehicle > svg { color: #607c91; }
.system-tile h3 { margin: 18px 0 7px; font-size: 20px; font-weight: 600; }
.system-tile p { max-width: 225px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.tile-link { display: inline-flex; align-items: center; gap: 6px; margin-top: 17px; color: var(--forest); font-size: 11px; font-weight: 700; } .tile-link svg { width: 13px; height: 13px; }
.backend-band { padding: 88px 0 94px; background: var(--forest); color: white; }
.backend-layout { display: grid; grid-template-columns: .85fr 1.7fr; gap: 100px; } .backend-layout .eyebrow { color: var(--lime); } .backend-layout h2 { font-size: 46px; }
.backend-list { border-top: 1px solid rgba(255,255,255,.24); }
.backend-list > div { display: grid; grid-template-columns: 48px 150px 1fr; align-items: baseline; gap: 14px; padding: 19px 0; border-bottom: 1px solid rgba(255,255,255,.24); }
.backend-list > div > span { color: var(--lime); font-family: var(--mono); font-size: 10px; } .backend-list h3 { margin: 0; font-size: 19px; font-weight: 500; }
.backend-list p { margin: 0; color: rgba(255,255,255,.73); font-size: 13px; }
.closing-band { display: flex; min-height: 220px; align-items: center; justify-content: space-between; gap: 28px; }
.closing-band .eyebrow { margin-bottom: 12px; } .closing-band h2 { max-width: 620px; margin: 0; font-size: 40px; font-weight: 500; line-height: 1.14; }
.site-footer { padding: 29px 0; border-top: 1px solid var(--line); }
.footer-layout { display: grid; grid-template-columns: auto 1fr auto auto; align-items: center; gap: 28px; }
.footer-brand { font-size: 15px; } .footer-brand .brand-mark { width: 27px; height: 27px; font-size: 15px; }
.footer-layout > p { margin: 0; color: var(--muted); font-size: 11px; } .footer-links { display: flex; flex-wrap: wrap; gap: 10px 18px; }
.footer-links a { display: inline-flex; align-items: center; gap: 4px; color: var(--muted); font-size: 11px; } .copyright { color: var(--muted); font-family: var(--mono); font-size: 9px; }
.page-hero { position: relative; overflow: hidden; background: var(--forest-deep); color: white; }
.page-hero-layout { display: grid; min-height: 445px; grid-template-columns: 1.1fr .9fr; align-items: center; gap: 45px; padding-top: 42px; padding-bottom: 42px; }
.page-hero-copy { position: relative; z-index: 1; } .page-hero .eyebrow { color: var(--lime); }
.page-hero h1 { font-size: 78px; }
.page-hero-copy > p:not(.eyebrow) { max-width: 495px; margin: 20px 0 0; color: rgba(255,255,255,.76); font-size: 16px; line-height: 1.65; }
.page-hero-copy .button { margin-top: 28px; }
.engine-hero::after, .start-hero::after, .about-hero::after { position: absolute; top: -180px; right: -145px; width: 620px; height: 620px; border: 1px solid rgba(216,238,103,.19); border-radius: 50%; content: ''; }
.engine-hero { background: #263a3a; }
.architecture-visual { position: relative; width: min(100%,430px); aspect-ratio: 1; justify-self: center; }
.arch-orbit { position: absolute; top: 50%; left: 50%; width: 75%; aspect-ratio: 1; border: 1px solid rgba(216,238,103,.34); border-radius: 50%; transform: translate(-50%,-50%); }
.orbit-b { width: 50%; border-color: rgba(255,255,255,.32); }
.arch-center { position: absolute; top: 50%; left: 50%; display: grid; width: 82px; aspect-ratio: 1; place-items: center; background: var(--lime); color: var(--forest-deep); font-size: 28px; font-weight: 700; transform: translate(-50%,-50%); }
.arch-node { position: absolute; display: grid; min-width: 93px; min-height: 38px; place-items: center; border: 1px solid rgba(255,255,255,.48); background: #263a3a; color: white; font-family: var(--mono); font-size: 9px; }
.node-core { top: 8%; left: 50%; transform: translateX(-50%); } .node-render { top: 50%; right: 0; transform: translateY(-50%); }
.node-physics { bottom: 8%; left: 50%; transform: translateX(-50%); } .node-tools { top: 50%; left: 0; transform: translateY(-50%); }
.arch-caption { position: absolute; right: 0; bottom: 1%; left: 0; color: rgba(255,255,255,.55); font-family: var(--mono); font-size: 9px; text-align: center; }
.scope-note { display: flex; max-width: var(--page); align-items: start; gap: 12px; margin-top: 27px; margin-bottom: 15px; padding: 13px 16px; border-left: 3px solid #85a594; background: #e9ece3; }
.scope-note svg { flex: 0 0 auto; width: 16px; height: 16px; margin-top: 2px; color: var(--forest); }
.scope-note p { margin: 0; color: #4c5c52; font-size: 11px; line-height: 1.6; }
.detail-section { display: grid; grid-template-columns: .8fr 1.4fr; gap: 80px; padding-top: 77px; padding-bottom: 89px; }
.detail-heading .eyebrow { margin-bottom: 16px; } .detail-heading h2 { font-size: 42px; }
.detail-body { border-top: 1px solid var(--line); }
.detail-row { display: grid; grid-template-columns: 38px 1fr auto; align-items: start; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.detail-number, .detail-tag { color: var(--muted); font-family: var(--mono); font-size: 9px; }
.detail-row h3 { margin: -4px 0 5px; font-size: 17px; font-weight: 600; }
.detail-row p { max-width: 580px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.detail-tag { padding-top: 2px; text-align: right; }
.rendering-section { padding: 79px 0 81px; background: #e6ece4; }
.rendering-section .section-heading { margin-bottom: 31px; } .render-table { border-top: 1px solid #bfc9be; }
.render-row { display: grid; grid-template-columns: .65fr .8fr 1.4fr; gap: 24px; align-items: baseline; padding: 17px 0; border-bottom: 1px solid #bfc9be; color: #4c5c52; font-size: 13px; }
.render-head { color: #718076; font-family: var(--mono); font-size: 9px; } .render-name { color: var(--ink); font-size: 16px; font-weight: 600; }
.render-extras { display: grid; grid-template-columns: .65fr 2.2fr; gap: 24px; margin-top: 26px; }
.render-extras .eyebrow { margin: 0; } .render-extras > p:last-child { margin: 0; color: #4c5c52; font-size: 13px; line-height: 1.9; }
.render-extras span { padding: 0 5px; color: #a05f47; }
.tools-band, .commands-band, .links-band { padding: 83px 0; background: var(--forest); color: white; }
.tools-layout, .commands-layout, .links-layout { display: grid; grid-template-columns: .8fr 1.2fr; align-items: start; gap: 110px; }
.tools-layout .eyebrow, .commands-layout .eyebrow, .links-layout .eyebrow { color: var(--lime); }
.tools-layout h2, .commands-layout h2, .links-layout h2 { font-size: 46px; }
.tools-layout > div:first-child > p:last-child, .commands-layout > div:first-child > p:last-child { max-width: 290px; margin: 18px 0 0; color: rgba(255,255,255,.7); font-size: 13px; }
.tool-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 30px; margin: 0; padding: 0; list-style: none; }
.tool-list li { display: flex; min-height: 65px; align-items: center; gap: 12px; border-bottom: 1px solid rgba(255,255,255,.22); color: rgba(255,255,255,.84); font-size: 12px; }
.tool-list svg { flex: 0 0 auto; width: 17px; height: 17px; color: var(--lime); }
.vehicle-hero { background: #19372e; }
.wheel-diagram { position: relative; width: min(100%,400px); height: 340px; justify-self: center; }
.vehicle-body { position: absolute; top: 50%; left: 50%; width: 112px; height: 225px; border: 1px solid rgba(255,255,255,.7); border-radius: 48px 48px 24px 24px; background: linear-gradient(180deg,rgba(216,238,103,.52),rgba(216,238,103,.08)); transform: translate(-50%,-50%); }
.vehicle-body::before, .vehicle-body::after { position: absolute; right: 15px; left: 15px; height: 1px; background: rgba(255,255,255,.48); content: ''; }
.vehicle-body::before { top: 57px; } .vehicle-body::after { bottom: 50px; }
.vehicle-body span { position: absolute; top: 80px; right: 15px; bottom: 73px; left: 15px; border: 1px solid rgba(255,255,255,.38); border-radius: 28px 28px 10px 10px; }
.wheel-label { position: absolute; z-index: 1; display: grid; width: 43px; height: 58px; place-items: center; background: var(--lime); color: var(--forest-deep); font-family: var(--mono); font-size: 11px; }
.wheel-fr { top: 48px; right: calc(50% - 105px); } .wheel-fl { top: 48px; left: calc(50% - 105px); }
.wheel-rr { bottom: 48px; right: calc(50% - 105px); } .wheel-rl { bottom: 48px; left: calc(50% - 105px); }
.diagram-caption { position: absolute; right: 0; bottom: 0; left: 0; color: rgba(255,255,255,.58); font-family: var(--mono); font-size: 9px; text-align: center; }
.vehicle-capabilities { padding-bottom: 75px; }
.setup-band { padding: 82px 0; background: var(--sky); }
.setup-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 110px; }
.setup-intro h2 { font-size: 46px; } .setup-intro > p:last-child { max-width: 320px; margin: 17px 0 0; color: #4c5c52; font-size: 13px; line-height: 1.7; }
.setup-data { border-top: 1px solid #9eb9ad; }
.setup-line { display: flex; min-height: 59px; align-items: center; justify-content: space-between; gap: 20px; border-bottom: 1px solid #9eb9ad; }
.setup-line span { color: #53695e; font-family: var(--mono); font-size: 9px; } .setup-line strong { font-size: 15px; font-weight: 600; text-align: right; }
.data-footnote { margin: 15px 0 0; color: #63736a; font-size: 10px; line-height: 1.6; }
.workflow-section { padding-top: 83px; padding-bottom: 93px; } .workflow-section .section-heading { margin-bottom: 34px; }
.workflow-list { display: grid; grid-template-columns: repeat(5,1fr); margin: 0; padding: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); list-style: none; }
.workflow-list li { min-height: 200px; padding: 19px 17px; border-right: 1px solid var(--line); } .workflow-list li:first-child { border-left: 1px solid var(--line); }
.workflow-list li > span { color: #9a634f; font-family: var(--mono); font-size: 10px; }
.workflow-list h3 { margin: 39px 0 7px; font-size: 16px; } .workflow-list p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.workflow-note { display: flex; align-items: start; gap: 9px; margin: 17px 0 0; color: var(--muted); font-size: 10px; }
.workflow-note svg { flex: 0 0 auto; width: 15px; height: 15px; color: #a35f47; }
.start-hero { background: #34443e; }
.terminal-art { position: relative; width: min(100%,420px); justify-self: center; border: 1px solid rgba(255,255,255,.36); background: #15241e; box-shadow: 18px 18px 0 rgba(216,238,103,.12); transform: rotate(1.5deg); }
.terminal-top { display: flex; height: 42px; align-items: center; gap: 6px; padding: 0 13px; border-bottom: 1px solid rgba(255,255,255,.17); }
.terminal-top > span { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); } .terminal-top > span:nth-child(2) { background: var(--lime); } .terminal-top > span:nth-child(3) { background: #80b9a2; }
.terminal-top b { margin-left: auto; color: rgba(255,255,255,.58); font-family: var(--mono); font-size: 8px; font-weight: 400; }
.terminal-code { padding: 27px 25px 22px; font-family: var(--mono); } .terminal-code p { margin: 0 0 13px; color: white; font-size: 12px; }
.terminal-code p i { margin-right: 8px; color: var(--lime); font-style: normal; } .terminal-code .terminal-muted { padding-left: 20px; color: rgba(255,255,255,.5); font-size: 10px; }
.terminal-progress { height: 3px; margin: 28px 0 18px; background: rgba(255,255,255,.14); } .terminal-progress span { display: block; width: 73%; height: 100%; background: var(--lime); }
.terminal-code small { color: rgba(255,255,255,.55); font-size: 8px; }
.requirements-section { padding-top: 76px; padding-bottom: 87px; }
.requirements-grid { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.requirement { position: relative; min-height: 220px; padding: 20px; border-right: 1px solid var(--line); } .requirement:first-child { border-left: 1px solid var(--line); }
.requirement-index { position: absolute; top: 22px; right: 18px; color: var(--muted); font-family: var(--mono); font-size: 9px; }
.requirement > svg { display: block; width: 23px; height: 23px; margin-top: 37px; color: #527764; }
.requirement h3 { margin: 20px 0 6px; font-size: 17px; } .requirement p { max-width: 205px; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.6; }
.commands-band { padding-top: 77px; padding-bottom: 81px; } .code-panel { border: 1px solid rgba(255,255,255,.26); background: #142b23; }
.code-title { display: flex; justify-content: space-between; gap: 15px; padding: 13px 17px; border-bottom: 1px solid rgba(255,255,255,.2); color: rgba(255,255,255,.59); font-family: var(--mono); font-size: 8px; }
.code-panel pre { overflow-x: auto; margin: 0; padding: 24px 20px; color: #f2f3e8; font-family: var(--mono); font-size: 11px; line-height: 2; tab-size: 2; }
.code-source { display: inline-flex; align-items: center; gap: 7px; margin: 0 20px 20px; color: var(--lime); font-size: 10px; } .code-source svg { width: 13px; height: 13px; }
.run-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 110px; padding-top: 81px; padding-bottom: 85px; }
.run-section .detail-heading h2 { font-size: 42px; } .run-content { border-top: 1px solid var(--line); }
.run-command { display: flex; min-height: 69px; align-items: center; justify-content: space-between; gap: 15px; border-bottom: 1px solid var(--line); }
.run-command > div { display: flex; min-width: 0; flex-direction: column; gap: 4px; }
.run-command span { color: var(--muted); font-family: var(--mono); font-size: 8px; }
.run-command code, .data-footnote code { overflow-wrap: anywhere; color: var(--ink); font-family: var(--mono); font-size: 11px; }
.about-hero { background: #38453e; }
.about-stamp { display: flex; width: 270px; height: 270px; flex-direction: column; align-items: center; justify-content: center; justify-self: center; border: 1px solid rgba(216,238,103,.68); border-radius: 50%; color: var(--lime); transform: rotate(-10deg); }
.about-stamp span { font-family: var(--mono); font-size: 12px; } .about-stamp b { font-size: 48px; font-weight: 500; line-height: 1.1; }
.about-stamp i { margin-top: 13px; color: rgba(255,255,255,.72); font-family: var(--mono); font-size: 8px; font-style: normal; }
.about-section { display: grid; grid-template-columns: .8fr 1.2fr; gap: 110px; padding-top: 72px; padding-bottom: 88px; }
.about-section .detail-heading h2 { font-size: 42px; } .about-copy > p:first-child { margin: 0; color: #34463b; font-size: 19px; line-height: 1.6; }
.about-copy blockquote { margin: 28px 0; padding: 19px 22px; border-left: 3px solid var(--orange); background: #e9e8df; font-size: 21px; font-weight: 600; }
.about-copy .data-footnote { max-width: 570px; margin: 0 0 20px; }
.project-links { border-top: 1px solid rgba(255,255,255,.25); }
.project-links > a { display: grid; grid-template-columns: 38px 1fr 18px; align-items: center; gap: 18px; min-height: 84px; border-bottom: 1px solid rgba(255,255,255,.25); }
.project-links > a > span { color: var(--lime); font-family: var(--mono); font-size: 10px; }
.project-links h3 { margin: 0 0 3px; font-size: 17px; font-weight: 500; } .project-links p { margin: 0; color: rgba(255,255,255,.65); font-size: 11px; }
.project-links svg { width: 16px; height: 16px; color: var(--lime); }
@keyframes rise-in { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
@keyframes photo-in { from { opacity: .5; transform: scale(1.025); } to { opacity: 1; transform: scale(1); } }
@media (max-width: 900px) {
  .page-width { width: min(var(--page),calc(100% - 44px)); } .site-header { padding-inline: 22px; } .primary-nav { gap: 17px; } .primary-nav > a { font-size: 12px; }
  .home-hero h1 { font-size: 76px; } .page-hero h1 { font-size: 68px; }
  .intro-layout h2, .section-heading h2, .backend-layout h2, .detail-heading h2, .setup-intro h2, .tools-layout h2, .commands-layout h2, .links-layout h2 { font-size: 44px; }
  .intro-layout { grid-template-columns: .8fr 1.35fr 1fr; gap: 22px; } .system-grid { grid-template-columns: repeat(2,1fr); }
  .system-tile:nth-child(3) { border-left: 1px solid var(--line); } .system-tile:nth-child(n+3) { border-top: 1px solid var(--line); }
  .backend-layout, .tools-layout, .commands-layout, .links-layout, .detail-section, .setup-layout, .run-section, .about-section { gap: 55px; }
  .workflow-list { grid-template-columns: repeat(3,1fr); } .workflow-list li:nth-child(4) { border-left: 1px solid var(--line); border-top: 1px solid var(--line); } .workflow-list li:nth-child(5) { border-top: 1px solid var(--line); }
  .footer-layout { grid-template-columns: auto 1fr auto; } .copyright { grid-column: 2 / 4; justify-self: end; }
}
@media (max-width: 640px) {
  html { scroll-padding-top: 70px; } .page-width { width: calc(100% - 36px); }
  .site-header { height: 66px; padding-inline: 18px; } .brand { font-size: 16px; } .brand-mark { width: 29px; height: 29px; }
  .menu-toggle { display: inline-flex; } .primary-nav { position: absolute; top: 65px; right: 0; left: 0; display: none; height: auto; align-items: stretch; gap: 0; padding: 8px 18px 17px; border-bottom: 1px solid var(--line); background: var(--paper); }
  .primary-nav.is-open { display: flex; flex-direction: column; } .primary-nav > a { padding: 13px 5px; border-bottom: 1px solid var(--line); font-size: 14px; }
  .primary-nav .nav-cta { justify-content: space-between; margin-top: 12px; padding-inline: 12px; border: 1px solid var(--ink); }
  .home-hero { min-height: 568px; height: min(710px,calc(100svh - 66px)); align-items: center; } .hero-photo { object-position: 61% center; }
  .hero-shade { background: linear-gradient(90deg,rgba(13,31,24,.91),rgba(13,31,24,.52) 68%,rgba(13,31,24,.24)),linear-gradient(0deg,rgba(12,28,22,.75),transparent 48%); }
  .hero-content { padding-bottom: 40px; } .hero-content .eyebrow { margin-bottom: 21px; } .home-hero h1 { font-size: 56px; }
  .hero-description { max-width: 390px; margin-top: 18px; font-size: 15px; } .hero-actions { align-items: flex-start; flex-direction: column; gap: 17px; margin-top: 24px; }
  .hero-meta { bottom: 15px; flex-wrap: wrap; gap: 6px 12px; font-size: 8px; } .hero-meta span + span { padding-left: 12px; } .image-credit { right: 10px; bottom: 55px; font-size: 8px; }
  .intro-band { padding: 61px 0 64px; } .intro-layout { grid-template-columns: 1fr; gap: 14px; } .intro-layout .eyebrow { padding: 0; margin-bottom: 2px; }
  .intro-layout h2, .section-heading h2 { font-size: 37px; } .intro-copy { max-width: 430px; margin-top: 6px; }
  .system-section { padding-top: 64px; padding-bottom: 72px; } .section-heading { align-items: start; flex-direction: column; gap: 13px; margin-bottom: 25px; }
  .section-aside { max-width: 360px; margin: 0; font-size: 13px; } .system-grid { grid-template-columns: 1fr 1fr; }
  .system-tile { min-height: 238px; padding: 16px 13px; } .system-tile > svg { margin-top: 25px; } .system-tile h3 { font-size: 18px; }
  .system-tile p { font-size: 11px; } .tile-link { font-size: 10px; }
  .backend-band { padding: 62px 0; } .backend-layout { grid-template-columns: 1fr; gap: 26px; }
  .backend-layout h2, .tools-layout h2, .commands-layout h2, .links-layout h2, .setup-intro h2 { font-size: 39px; }
  .backend-list > div { grid-template-columns: 32px 105px 1fr; gap: 8px; } .backend-list h3 { font-size: 16px; } .backend-list p { font-size: 11px; }
  .closing-band { min-height: 195px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 20px; padding-top: 34px; padding-bottom: 34px; }
  .closing-band h2 { font-size: 29px; } .footer-layout { grid-template-columns: 1fr auto; gap: 12px; }
  .footer-layout > p { grid-column: 1 / 3; grid-row: 2; } .footer-links { grid-column: 1 / 3; grid-row: 3; } .copyright { grid-column: 1 / 3; grid-row: 4; justify-self: end; }
  .site-footer { padding: 23px 0; }
  .page-hero-layout { min-height: 0; grid-template-columns: 1fr; gap: 26px; padding-top: 61px; padding-bottom: 45px; }
  .page-hero h1 { font-size: 56px; } .page-hero-copy > p:not(.eyebrow) { font-size: 14px; }
  .architecture-visual { width: min(76vw,310px); } .arch-node { min-width: 76px; min-height: 32px; font-size: 8px; } .arch-center { width: 65px; font-size: 22px; }
  .scope-note { width: calc(100% - 36px); margin-top: 18px; padding: 11px 12px; } .scope-note p { font-size: 10px; }
  .detail-section, .about-section, .run-section { grid-template-columns: 1fr; gap: 27px; padding-top: 55px; padding-bottom: 61px; }
  .detail-heading h2, .run-section .detail-heading h2, .about-section .detail-heading h2 { font-size: 36px; }
  .detail-row { grid-template-columns: 25px 1fr; gap: 10px; padding: 17px 0; } .detail-tag { grid-column: 2; text-align: left; }
  .rendering-section { padding: 58px 0 62px; } .render-row { grid-template-columns: .75fr 1fr; gap: 10px; font-size: 11px; }
  .render-row > :last-child { grid-column: 1 / 3; margin-top: -6px; color: var(--muted); font-size: 10px; }
  .render-head > :last-child { display: none; } .render-name { font-size: 14px; } .render-extras { grid-template-columns: 1fr; gap: 8px; }
  .tools-band, .commands-band, .links-band { padding: 60px 0; } .tools-layout, .commands-layout, .links-layout { grid-template-columns: 1fr; gap: 29px; }
  .tool-list { gap: 0 14px; } .tool-list li { min-height: 61px; gap: 8px; font-size: 10px; } .tool-list svg { width: 15px; height: 15px; }
  .wheel-diagram { width: min(88vw,340px); height: 285px; } .vehicle-body { width: 92px; height: 190px; }
  .wheel-label { width: 36px; height: 48px; font-size: 9px; } .wheel-fr { top: 40px; right: calc(50% - 87px); } .wheel-fl { top: 40px; left: calc(50% - 87px); }
  .wheel-rr { bottom: 40px; right: calc(50% - 87px); } .wheel-rl { bottom: 40px; left: calc(50% - 87px); } .diagram-caption { font-size: 8px; }
  .setup-band { padding: 59px 0; } .setup-layout { grid-template-columns: 1fr; gap: 25px; }
  .workflow-section { padding-top: 61px; padding-bottom: 66px; } .workflow-list { grid-template-columns: 1fr 1fr; }
  .workflow-list li { min-height: 175px; padding: 15px 12px; } .workflow-list li:nth-child(3) { border-left: 1px solid var(--line); border-top: 1px solid var(--line); }
  .workflow-list li:nth-child(4), .workflow-list li:nth-child(5) { border-top: 1px solid var(--line); }
  .workflow-list h3 { margin-top: 29px; font-size: 14px; } .workflow-list p { font-size: 11px; } .workflow-note { line-height: 1.55; }
  .terminal-art { width: min(100%,370px); } .requirements-section { padding-top: 58px; padding-bottom: 65px; }
  .requirements-grid { grid-template-columns: 1fr 1fr; } .requirement { min-height: 190px; padding: 15px; }
  .requirement:nth-child(3) { border-left: 1px solid var(--line); border-top: 1px solid var(--line); } .requirement:nth-child(4) { border-top: 1px solid var(--line); }
  .requirement-index { top: 17px; right: 13px; font-size: 8px; } .requirement > svg { margin-top: 31px; }
  .requirement h3 { margin-top: 16px; font-size: 15px; } .requirement p { font-size: 11px; }
  .code-panel pre { padding: 18px 13px; font-size: 9px; } .code-title { font-size: 7px; } .run-command code { font-size: 9px; }
  .about-stamp { width: 210px; height: 210px; } .about-stamp b { font-size: 38px; }
  .about-copy > p:first-child { font-size: 17px; } .about-copy blockquote { font-size: 19px; } .project-links > a { grid-template-columns: 26px 1fr 16px; gap: 12px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; } }

/* BlueSky black-and-electric-blue theme */
:root {
  color-scheme: dark;
  --paper: #030507;
  --white: #0b1018;
  --ink: #f5f7fb;
  --forest: #080d15;
  --forest-deep: #020305;
  --muted: #a0a9b7;
  --line: #202936;
  --lime: #168cff;
  --orange: #57b8ff;
  --sky: #080d15;
}

body { background: var(--paper); color: var(--ink); }
.site-header { background: #05070a; border-bottom-color: rgba(255,255,255,.12); }
.brand-mark { background: #0a1d32; color: #42a8ff; }
.primary-nav > a:hover, .primary-nav > a[aria-current="page"] { color: #58b2ff; }
.primary-nav .nav-cta { border-color: #334154; }
.menu-toggle { border-color: var(--line); color: var(--ink); }
.eyebrow { color: #72baff; }
.status-dot { background: #168cff; box-shadow: 0 0 12px rgba(22,140,255,.65); }
.home-hero { background: #020305; }
.hero-shade { background: linear-gradient(90deg,rgba(0,0,0,.94),rgba(0,0,0,.77) 33%,rgba(0,0,0,.13) 72%),linear-gradient(0deg,rgba(0,0,0,.7),transparent 38%); }
.button-lime { background: #168cff; color: #fff; }
.button-lime:hover { background: #48a8ff; }
.button-dark { background: #147fe6; color: #fff; }
.button-dark:hover { background: #3299ff; }
.intro-band { background: #080d15; border-block: 1px solid #131e2c; }
.intro-layout h2 span { color: #54aaff; }
.intro-copy p { color: #b4bdc9; }
.arrow-link, .tile-link { color: #69b7ff; }
.system-tile:hover { background: #0b121c; }
.tile-render > svg, .tile-physics > svg, .tile-vehicle > svg, .system-tile > svg { color: #4aa8ff; }
.backend-band, .tools-band, .commands-band, .links-band { background: #070b11; }
.page-hero { background: #05080d; }
.engine-hero, .vehicle-hero { background: #060b12; }
.start-hero, .about-hero { background: #080c12; }
.engine-hero::after, .start-hero::after, .about-hero::after { border-color: rgba(22,140,255,.24); }
.arch-orbit { border-color: rgba(22,140,255,.55); }
.orbit-b { border-color: rgba(255,255,255,.25); }
.arch-center { background: #168cff; color: #fff; }
.arch-node { border-color: rgba(87,169,255,.64); background: #07101a; }
.scope-note { border-left-color: #168cff; background: #0a121d; }
.scope-note svg { color: #58b2ff; }
.scope-note p { color: #c0c9d5; }
.detail-row p, .section-aside { color: var(--muted); }
.rendering-section { background: #080d15; border-block: 1px solid #142030; }
.render-row { border-bottom-color: #202936; color: #aeb8c6; }
.render-table { border-top-color: #202936; }
.render-head { color: #66b5ff; }
.render-name { color: var(--ink); }
.render-extras > p:last-child { color: #b3bdca; }
.render-extras span { color: #58aaff; }
.vehicle-body { border-color: rgba(105,184,255,.85); background: linear-gradient(180deg,rgba(22,140,255,.32),rgba(22,140,255,.05)); }
.vehicle-body::before, .vehicle-body::after, .vehicle-body span { border-color: rgba(105,184,255,.55); background-color: rgba(105,184,255,.55); }
.wheel-label { background: #168cff; color: #fff; }
.setup-band { background: #080d15; border-block: 1px solid #142030; }
.setup-intro > p:last-child { color: #b4bdc9; }
.setup-data, .setup-line { border-color: #283544; }
.setup-line span, .data-footnote { color: #9daaba; }
.workflow-list li > span { color: #58b2ff; }
.workflow-note { color: #aab5c3; }
.workflow-note svg { color: #58b2ff; }
.terminal-art { border-color: rgba(87,169,255,.5); background: #050a11; box-shadow: 18px 18px 0 rgba(22,140,255,.1); }
.terminal-progress span { background: #168cff; }
.terminal-code p i { color: #64b7ff; }
.terminal-top > span { background: #168cff; }
.terminal-top > span:nth-child(2) { background: #57b8ff; }
.terminal-top > span:nth-child(3) { background: #9dd7ff; }
.requirement > svg { color: #58b2ff; }
.code-panel { border-color: rgba(87,169,255,.3); background: #050a11; }
.code-source, .project-links svg { color: #64b7ff; }
.run-command > svg { color: #58b2ff; }
.about-stamp { border-color: rgba(22,140,255,.78); color: #68baff; }
.about-copy > p:first-child { color: #c4ccd7; }
.about-copy blockquote { border-left-color: #168cff; background: #0b121c; }
.project-links { border-top-color: rgba(255,255,255,.18); }
.project-links > a { border-bottom-color: rgba(255,255,255,.18); }

@media (max-width: 640px) {
  .primary-nav { background: #05070a; }
}

@view-transition {
  navigation: auto;
}

::view-transition-old(root) {
  animation: page-exit .18s ease-in both;
}

::view-transition-new(root) {
  animation: page-enter .32s cubic-bezier(.2,.75,.25,1) both;
}

@keyframes page-exit {
  to { opacity: 0; transform: translateY(-5px); }
}

@keyframes page-enter {
  from { opacity: 0; transform: translateY(9px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root), ::view-transition-new(root) {
    animation: none;
  }
}