:root {
    color-scheme: dark;
    --bg: #0a0d11;
    --bg-raised: #10151b;
    --panel: #141a21;
    --panel-soft: #191f27;
    --text: #f4f1e8;
    --muted: #aeb6be;
    --line: #303842;
    --line-bright: #4a5561;
    --accent: #ffb000;
    --accent-2: #78e0d3;
    --danger: #ff7c66;
    --max: 1180px;
    --radius: 3px;
    --shadow: 0 24px 70px rgba(0, 0, 0, .28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background:
        linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px),
        var(--bg);
    background-size: 36px 36px;
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 17px;
    line-height: 1.7;
    text-rendering: optimizeLegibility;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at 80% 0%, rgba(120,224,211,.07), transparent 32rem);
    z-index: -1;
}

::selection { background: var(--accent); color: #111; }
a { color: inherit; }
img, svg { max-width: 100%; }
button, input, textarea, select { font: inherit; }

.skip-link {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 100;
    transform: translateY(-160%);
    background: var(--accent);
    color: #111;
    padding: .7rem 1rem;
    font-weight: 800;
    text-decoration: none;
}
.skip-link:focus { transform: translateY(0); }

.shell { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid rgba(255,255,255,.08);
    background: rgba(10,13,17,.9);
    backdrop-filter: blur(18px);
}
.header-inner {
    width: min(calc(100% - 40px), var(--max));
    min-height: 82px;
    margin-inline: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}
.brand { display: inline-flex; align-items: center; gap: .9rem; text-decoration: none; }
.brand-mark {
    width: 45px;
    aspect-ratio: 1;
    display: grid;
    place-items: center;
    position: relative;
    border: 1px solid var(--line-bright);
    background: var(--bg-raised);
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .82rem;
    font-weight: 900;
    letter-spacing: -.05em;
}
.brand-mark::before,
.brand-mark::after {
    content: "";
    position: absolute;
    width: 10px;
    height: 10px;
    border-color: var(--accent);
}
.brand-mark::before { top: -1px; left: -1px; border-top: 2px solid var(--accent); border-left: 2px solid var(--accent); }
.brand-mark::after { right: -1px; bottom: -1px; border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent); }
.brand-copy { display: grid; line-height: 1.15; }
.brand-copy strong { font-size: 1.05rem; letter-spacing: .01em; }
.brand-copy small { margin-top: .3rem; color: var(--muted); font-size: .68rem; letter-spacing: .13em; text-transform: uppercase; }

.main-nav { display: flex; align-items: center; gap: .35rem; }
.main-nav a {
    padding: .7rem .9rem;
    color: var(--muted);
    text-decoration: none;
    font-size: .88rem;
    font-weight: 750;
    letter-spacing: .04em;
    border: 1px solid transparent;
}
.main-nav a:hover { color: var(--text); border-color: var(--line); }
.main-nav a[aria-current="page"] { color: var(--accent); border-color: rgba(255,176,0,.35); background: rgba(255,176,0,.055); }

.kicker, .section-index, .chapter-label, .route-meta, .system-tag {
    margin: 0 0 1.1rem;
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .74rem;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
}
.kicker { display: flex; gap: 1rem; }
.kicker span + span::before { content: "/"; margin-right: 1rem; color: var(--line-bright); }

.hero {
    min-height: 720px;
    padding: clamp(5rem, 10vw, 8.5rem) 0 6rem;
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(310px, .75fr);
    align-items: center;
    gap: clamp(3rem, 8vw, 7rem);
}
.hero h1, .page-hero h1 {
    margin: 0;
    font-size: clamp(3.6rem, 8vw, 7.7rem);
    line-height: .88;
    letter-spacing: -.075em;
    max-width: 10ch;
}
.hero h1 em { color: var(--accent); font-style: normal; }
.hero-lead {
    max-width: 720px;
    margin: 2rem 0 0;
    color: #d6d7d5;
    font-size: clamp(1.08rem, 1.5vw, 1.3rem);
    line-height: 1.75;
}
.button-row { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2.3rem; }
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .75rem;
    min-height: 50px;
    padding: .85rem 1.15rem;
    border: 1px solid var(--line-bright);
    text-decoration: none;
    font-size: .88rem;
    font-weight: 850;
    letter-spacing: .02em;
    transition: transform .18s ease, border-color .18s ease, background .18s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--accent); border-color: var(--accent); color: #111; }
.button-primary:hover { background: #ffc13c; border-color: #ffc13c; }
.button-secondary { background: var(--panel); }
.button-secondary:hover { border-color: var(--accent-2); }
.microcopy { margin: 1rem 0 0; color: var(--muted); font-size: .79rem; }

.signal-board {
    border: 1px solid var(--line-bright);
    background: #0d1116;
    box-shadow: var(--shadow);
    transform: rotate(.35deg);
}
.signal-head {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: .8rem 1rem;
    border-bottom: 1px solid var(--line);
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: .68rem;
    letter-spacing: .1em;
}
.status-dot { color: var(--accent-2); }
.status-dot::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: .5rem; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 16px var(--accent-2); }
.signal-board dl { margin: 0; }
.signal-board dl div { display: grid; grid-template-columns: 110px 1fr; gap: 1rem; padding: 1rem; border-bottom: 1px solid var(--line); }
.signal-board dt { color: var(--muted); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.signal-board dd { margin: 0; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .85rem; text-align: right; }
.signal-footer { display: grid; grid-template-columns: repeat(5, 1fr); gap: 4px; padding: .8rem; }
.signal-footer span { height: 4px; background: var(--line); }
.signal-footer span:nth-child(-n+3) { background: var(--accent); }

.manifesto-section { padding: 6.5rem 0; border-block: 1px solid var(--line); background: rgba(16,21,27,.76); }
.split-heading { display: grid; grid-template-columns: .65fr 1.35fr; gap: 4rem; align-items: start; }
h2 { margin: 0; font-size: clamp(2.15rem, 4vw, 4.2rem); line-height: 1.03; letter-spacing: -.055em; }
h3 { line-height: 1.25; }
.section-intro { max-width: 700px; color: var(--muted); font-size: 1.08rem; }
.manifesto-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 4rem; background: var(--line); border: 1px solid var(--line); }
.manifesto-grid article { position: relative; min-height: 330px; padding: 2rem; background: var(--bg-raised); }
.article-number { color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .78rem; }
.manifesto-grid h3 { margin: 4rem 0 1rem; font-size: 1.45rem; }
.manifesto-grid p { color: var(--muted); }

.route-section { padding-block: 7rem; }
.route-intro { max-width: 760px; }
.route-intro p:last-child { color: var(--muted); }
.route-list { margin-top: 3.5rem; border-top: 1px solid var(--line-bright); }
.route-card {
    display: grid;
    grid-template-columns: 150px 1.1fr 1.45fr 40px;
    gap: 2rem;
    align-items: center;
    padding: 1.7rem 1rem;
    border-bottom: 1px solid var(--line);
    text-decoration: none;
    transition: background .18s ease, padding .18s ease;
}
.route-card:hover { background: var(--panel); padding-inline: 1.4rem; }
.route-card strong { font-size: 1.2rem; }
.route-card p { margin: 0; color: var(--muted); font-size: .92rem; }
.route-arrow { color: var(--accent); font-size: 1.5rem; text-align: right; }
.route-card-accent { background: rgba(120,224,211,.035); }
.route-card-accent .route-meta, .route-card-accent .route-arrow { color: var(--accent-2); }

.principles-section { padding: 7rem 0; border-block: 1px solid var(--line); background: var(--panel); }
.principles-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(3rem, 8vw, 8rem); }
blockquote { margin: 0; max-width: 760px; font-size: clamp(2.2rem, 4.8vw, 4.8rem); line-height: 1.08; letter-spacing: -.055em; }
.principle-notes { border-top: 1px solid var(--line-bright); }
.principle-notes p { margin: 0; padding: 1.1rem 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.principle-notes strong { color: var(--text); }

.faq-section { padding-block: 7rem; }
.faq-heading { display: grid; grid-template-columns: .65fr 1.35fr; gap: 4rem; margin-bottom: 3rem; }
.faq-list { border-top: 1px solid var(--line-bright); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; padding: 1.45rem 3.3rem 1.45rem 0; cursor: pointer; font-size: 1.05rem; font-weight: 800; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: .5rem; top: 1.15rem; color: var(--accent); font-size: 1.7rem; font-weight: 400; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list details p { max-width: 800px; margin: 0; padding: 0 0 1.5rem; color: var(--muted); }

.page-hero { padding: clamp(4.5rem, 8vw, 7.5rem) 0 5rem; border-bottom: 1px solid var(--line); }
.page-hero-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 4rem; align-items: end; }
.page-hero h1 { max-width: none; }
.page-hero h1 + p { max-width: 650px; margin: 2rem 0 0; color: var(--muted); font-size: 1.18rem; }
.page-hero .button { margin-top: 2rem; }
.page-code {
    padding: 1.4rem;
    border: 1px solid var(--line-bright);
    background: var(--bg-raised);
    display: grid;
    gap: .5rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.page-code span, .page-code small { color: var(--muted); font-size: .68rem; letter-spacing: .12em; }
.page-code strong { color: var(--accent); font-size: 2.2rem; }

.chapter-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: clamp(3rem, 8vw, 7rem); padding-block: 5rem 8rem; }
.chapter-nav { position: sticky; top: 115px; align-self: start; border-top: 1px solid var(--line-bright); }
.chapter-nav p { color: var(--muted); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; }
.chapter-nav a { display: grid; grid-template-columns: 32px 1fr; gap: .55rem; padding: .8rem 0; border-bottom: 1px solid var(--line); color: var(--muted); text-decoration: none; font-size: .79rem; line-height: 1.4; }
.chapter-nav a:hover { color: var(--text); }
.chapter-nav a span { color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.chapter-content { min-width: 0; }
.chapter { padding: 0 0 6rem; margin: 0 0 6rem; border-bottom: 1px solid var(--line); scroll-margin-top: 120px; }
.chapter:last-child { margin-bottom: 0; }
.chapter h2 { max-width: 900px; }
.prose { margin-top: 2.3rem; max-width: 830px; }
.prose p { margin: 0 0 1.45rem; color: #d4d6d5; font-size: 1.04rem; }
.prose strong { color: var(--text); }
.prose-closing { padding: 1.5rem 1.7rem; border-left: 3px solid var(--accent); background: rgba(255,176,0,.045); }
.prose-closing p:last-child { margin-bottom: 0; }

.system-stack { display: grid; gap: 1rem; margin-top: 2.5rem; }
.system-card { display: grid; grid-template-columns: 155px 1fr 1.7fr; gap: 2rem; padding: 1.6rem; border: 1px solid var(--line); background: var(--bg-raised); }
.system-card h3, .system-card p { margin: 0; }
.system-card h3 { font-size: 1rem; }
.system-card p { color: var(--muted); font-size: .92rem; }
.system-card-placeholder { border-style: dashed; opacity: .68; }
.system-card-placeholder .system-tag { color: var(--danger); }

.spec-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 2.5rem; }
.spec-card { padding: 2rem; border: 1px solid var(--line); background: var(--bg-raised); }
.spec-card h3 { margin: 0 0 1.5rem; font-size: 1.1rem; }
.spec-card ul, .status-block ul { margin: 0; padding: 0; list-style: none; }
.spec-card li, .status-block li { position: relative; padding: .65rem 0 .65rem 1.45rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .91rem; }
.spec-card li::before, .status-block li::before { content: ""; position: absolute; left: 0; top: 1.22rem; width: 6px; height: 6px; background: var(--accent); }
.final-prose { padding: clamp(2rem, 5vw, 4rem); border: 1px solid var(--line-bright); background: var(--bg-raised); box-shadow: var(--shadow); }

.tunnel-diagram { display: grid; grid-template-columns: 1fr 45px 1.1fr 45px 1fr; align-items: center; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.diagram-client, .diagram-core { min-height: 145px; padding: 1rem; border: 1px solid var(--line-bright); background: var(--bg-raised); display: flex; flex-direction: column; justify-content: center; }
.diagram-core { min-height: 185px; border-color: var(--accent); box-shadow: 0 0 40px rgba(255,176,0,.08); }
.diagram-client span, .diagram-core span { color: var(--accent); font-size: .62rem; letter-spacing: .12em; }
.diagram-client strong, .diagram-core strong { margin: .5rem 0; font-size: .85rem; }
.diagram-client small, .diagram-core small { color: var(--muted); font-size: .62rem; }
.diagram-line { height: 1px; background: var(--accent-2); position: relative; }
.diagram-line::after { content: ""; position: absolute; right: 0; top: -3px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 12px var(--accent-2); }

.architecture-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin-top: 2.7rem; background: var(--line); border: 1px solid var(--line); }
.architecture-grid article { padding: 2rem; background: var(--bg-raised); }
.architecture-grid article:last-child { grid-column: 1 / -1; }
.architecture-grid article > span { display: inline-grid; place-items: center; min-width: 42px; height: 28px; padding-inline: .5rem; border: 1px solid rgba(255,176,0,.4); color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .67rem; }
.architecture-grid h3 { margin: 2.8rem 0 1rem; }
.architecture-grid p { margin: 0; color: var(--muted); font-size: .91rem; }

.status-columns { display: grid; gap: 1rem; margin-top: 2.7rem; }
.status-block { padding: 1.6rem 1.8rem; border: 1px solid var(--line); background: var(--bg-raised); }
.status-block h3 { display: flex; align-items: center; gap: .7rem; margin: 0 0 1rem; font-size: 1rem; }
.status-block h3 span { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.status-done h3 span { background: var(--accent-2); box-shadow: 0 0 12px rgba(120,224,211,.7); }
.status-progress h3 span { background: var(--accent); box-shadow: 0 0 12px rgba(255,176,0,.6); }
.status-planned h3 span { background: var(--muted); }
.status-block li::before { background: currentColor; opacity: .5; }
.faq-chapter { border-bottom: 0; padding-bottom: 0; }

.site-footer { border-top: 1px solid var(--line); background: #080b0e; }
.footer-inner { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; padding: 3.2rem 0; display: grid; grid-template-columns: 1.4fr 1fr auto; gap: 3rem; align-items: start; }
.footer-inner p { max-width: 550px; margin: .55rem 0 0; color: var(--muted); font-size: .82rem; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: .5rem 1.2rem; }
.footer-inner nav a { color: var(--muted); font-size: .82rem; text-decoration: none; }
.footer-inner nav a:hover { color: var(--accent); }
.footer-inner .copyright { margin: 0; white-space: nowrap; }

:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 4px; }

@media (max-width: 960px) {
    .hero { min-height: auto; grid-template-columns: 1fr; }
    .signal-board { max-width: 600px; transform: none; }
    .split-heading, .faq-heading, .principles-layout, .page-hero-grid { grid-template-columns: 1fr; gap: 2rem; }
    .manifesto-grid { grid-template-columns: 1fr; }
    .manifesto-grid article { min-height: auto; }
    .manifesto-grid h3 { margin-top: 2rem; }
    .route-card { grid-template-columns: 120px 1fr 40px; }
    .route-card p { grid-column: 2 / 3; }
    .chapter-layout { grid-template-columns: 1fr; }
    .chapter-nav { position: static; display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 1.5rem; }
    .chapter-nav p { grid-column: 1 / -1; }
    .system-card { grid-template-columns: 120px 1fr; }
    .system-card p { grid-column: 2; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .footer-inner .copyright { grid-column: 1 / -1; }
    .tunnel-diagram { margin-top: 1rem; }
}

@media (max-width: 680px) {
    body { font-size: 16px; }
    .shell, .header-inner, .footer-inner { width: min(calc(100% - 28px), var(--max)); }
    .site-header { position: static; }
    .header-inner { padding-block: 1rem; align-items: flex-start; flex-direction: column; gap: 1rem; }
    .main-nav { width: 100%; display: grid; grid-template-columns: repeat(3, 1fr); }
    .main-nav a { padding-inline: .55rem; text-align: center; font-size: .75rem; }
    .brand-copy small { font-size: .61rem; }
    .hero { padding-block: 4.5rem; gap: 3rem; }
    .hero h1, .page-hero h1 { font-size: clamp(3.1rem, 17vw, 5rem); }
    .kicker { flex-wrap: wrap; gap: .35rem 1rem; }
    .button-row, .button { width: 100%; }
    .signal-board dl div { grid-template-columns: 1fr; gap: .2rem; }
    .signal-board dd { text-align: left; }
    .manifesto-section, .route-section, .principles-section, .faq-section { padding-block: 4.5rem; }
    .route-card { grid-template-columns: 1fr 32px; gap: .7rem 1rem; padding-inline: .2rem; }
    .route-card .route-meta, .route-card strong, .route-card p { grid-column: 1; }
    .route-card .route-arrow { grid-column: 2; grid-row: 1 / 4; align-self: center; }
    .route-card:hover { padding-inline: .5rem; }
    .chapter-layout { padding-block: 3.5rem 5rem; }
    .chapter-nav { grid-template-columns: 1fr; }
    .chapter { padding-bottom: 4rem; margin-bottom: 4rem; }
    .system-card { grid-template-columns: 1fr; gap: .6rem; }
    .system-card p { grid-column: 1; }
    .spec-grid, .architecture-grid { grid-template-columns: 1fr; }
    .architecture-grid article:last-child { grid-column: auto; }
    .tunnel-diagram { grid-template-columns: 1fr; gap: 0; }
    .diagram-line { width: 1px; height: 35px; margin-inline: auto; }
    .diagram-line::after { right: -3px; top: auto; bottom: 0; }
    .diagram-client, .diagram-core { min-height: 120px; }
    .footer-inner { grid-template-columns: 1fr; gap: 2rem; }
    .footer-inner .copyright { grid-column: auto; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}