/* ==========================================================================
   LAYOUT — navigation, page headers, section dividers, footer, transitions
   ========================================================================== */

/* ---------------- scroll progress rail (top of viewport) ---------------- */
.rail { position: fixed; inset: 0 0 auto; height: 2px; z-index: 80; background: transparent; }
.rail i { display: block; height: 100%; width: 0; background: var(--ember); box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 60%, transparent); }

/* ---------------- navigation ----------------
   TOP BAR — brand · numbered links in a console strip (sliding accent
   indicator, Programmes drop-down) · live status · Engage.
   Sizes: --nav-h in tokens.css · link text: .nav-t · colours from tokens. */
.site-nav {
  position: fixed; inset: 0 0 auto; z-index: 70; height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding-inline: var(--gut);
  /* always a soft dark band so the links read over the live 3D */
  background: linear-gradient(to bottom, color-mix(in srgb, var(--deep) 88%, transparent), color-mix(in srgb, var(--deep) 0%, transparent));
  transition: background var(--d-mid), box-shadow var(--d-mid), transform var(--d-mid) var(--e-out), height var(--d-mid) var(--e-out);
}
.site-nav::after { /* hairline that lights up as you scroll */
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; opacity: 0; transition: opacity var(--d-mid);
  background: linear-gradient(90deg, transparent, var(--line-2) 12%, var(--line-2) 88%, transparent);
}
.site-nav.is-stuck {
  height: calc(var(--nav-h) - 8px);
  background: color-mix(in srgb, var(--deep) 84%, transparent); backdrop-filter: blur(18px) saturate(1.2); -webkit-backdrop-filter: blur(18px) saturate(1.2);
}
.site-nav.is-stuck::after { opacity: 1; }
.site-nav.is-away { transform: translateY(-101%); }

.brand { display: flex; align-items: center; gap: 13px; z-index: 2; }
.brand__mark { width: 33px; height: 45px; flex: none; transition: transform .45s var(--e-out), filter .45s var(--e-out); transform-origin: 50% 50%; }
.brand__mark svg { width: 100%; height: 100%; display: block; }
.brand__mark svg path { fill: var(--bone); transition: fill var(--d-fast); }
/* logo: glows and grows a little on hover, keyboard focus and click */
.brand:hover .brand__mark, .brand:focus-visible .brand__mark {
  transform: scale(1.12);
  filter: drop-shadow(0 0 6px color-mix(in srgb, var(--accent) 75%, transparent)) drop-shadow(0 0 16px color-mix(in srgb, var(--accent) 40%, transparent));
}
.brand:active .brand__mark { transform: scale(1.18); filter: drop-shadow(0 0 10px var(--accent)) drop-shadow(0 0 24px color-mix(in srgb, var(--accent) 55%, transparent)); transition-duration: .12s; }
.brand:hover .brand__mark svg path, .brand:focus-visible .brand__mark svg path, .brand:active .brand__mark svg path { fill: var(--accent); }
.brand__text { line-height: 1; }
.brand__name { font: var(--w-heading) 22px/1 var(--f-display); letter-spacing: .14em; text-transform: uppercase; }
.brand__sub { display: block; margin-top: 6px; font-family: var(--f-mono); font-size: 9.5px; letter-spacing: .24em; text-transform: uppercase; color: var(--bone-3); }

/* console strip */
/* links: open (no box), centred in the bar */
.nav-links { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: flex; align-items: stretch; height: 44px; }
.nav-a { position: relative; z-index: 1; display: flex; align-items: center; gap: 9px; height: 100%; padding: 0 18px;
  font-family: var(--f-mono); font-size: 12px; font-weight: 500; letter-spacing: .14em; text-transform: uppercase;
  color: var(--bone); transition: color var(--d-fast), background var(--d-fast); }
.nav-n { font-size: 9px; letter-spacing: .1em; color: var(--accent); opacity: .75; transition: opacity var(--d-fast); }
/* label rolls up to a second copy on hover */
.nav-t { position: relative; display: inline-block; overflow: hidden; line-height: 1.3; vertical-align: middle; }
.nav-r { position: relative; display: block; transition: transform .45s var(--e-out); }
.nav-r::after { content: attr(data-t); position: absolute; left: 0; top: 100%; color: var(--accent); }
.nav-a:hover .nav-r, .nav-a:focus-visible .nav-r { transform: translateY(-100%); }
.nav-a:hover .nav-n { opacity: 1; }
.nav-a[aria-current="page"] .nav-r { color: var(--bone); }
.nav-a[aria-current="page"] .nav-n { opacity: 1; }
.nav-caret { width: 6px; height: 6px; border: solid var(--bone-3); border-width: 0 1px 1px 0; transform: translateY(-2px) rotate(45deg); transition: transform var(--d-mid) var(--e-out), border-color var(--d-fast); }
.nav-dd.is-open .nav-caret { transform: translateY(1px) rotate(225deg); border-color: var(--accent); }
/* sliding indicator */
.nav-ind { position: absolute; left: 0; bottom: 0; height: 2px; width: 0; background: var(--accent); opacity: 0; z-index: 2;
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 70%, transparent);
  transition: transform .5s var(--e-out), width .5s var(--e-out), opacity var(--d-fast); pointer-events: none; }

/* Programmes drop-down */
.nav-dd { position: relative; display: flex; }
.nav-dd__panel { position: absolute; left: 50%; top: calc(100% + 10px); width: 420px; padding: 8px;
  background: color-mix(in srgb, var(--deep) 94%, transparent); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  box-shadow: inset 0 0 0 1px var(--line-2), 0 30px 60px -20px rgba(0,0,0,.7);
  opacity: 0; visibility: hidden; transform: translate(-50%, -8px); transition: opacity .25s, transform .4s var(--e-out), visibility 0s .25s; }
.nav-dd__panel::before { content: ""; position: absolute; left: 0; right: 0; top: -12px; height: 12px; } /* hover bridge */
.nav-dd.is-open .nav-dd__panel { opacity: 1; visibility: visible; transform: translate(-50%, 0); transition: opacity .25s, transform .4s var(--e-out), visibility 0s; }
.nav-dd__head { display: flex; justify-content: space-between; padding: 8px 10px 10px; font-size: 9px; letter-spacing: .2em; text-transform: uppercase; color: var(--bone-3); border-bottom: 1px solid var(--line); margin-bottom: 4px; }
.nav-dd__item { display: grid; grid-template-columns: 34px 1fr 16px; gap: 12px; align-items: center; padding: 11px 10px; position: relative;
  opacity: 0; transform: translateY(6px); transition: background var(--d-fast), opacity .35s var(--e-out), transform .35s var(--e-out); }
.nav-dd.is-open .nav-dd__item { opacity: 1; transform: none; transition-delay: calc(var(--k) * .05s); }
.nav-dd__item:hover { background: color-mix(in srgb, var(--bone) 6%, transparent); }
.nav-dd__l { font: var(--w-display) 26px/1 var(--f-display); color: transparent; -webkit-text-stroke: 1px var(--bone-3); transition: -webkit-text-stroke-color var(--d-fast); }
.nav-dd__item:hover .nav-dd__l { -webkit-text-stroke-color: var(--accent); }
.nav-dd__item strong { display: block; font: var(--w-heading) 15px/1.2 var(--f-display); text-transform: uppercase; letter-spacing: .04em; color: var(--bone); }
.nav-dd__item em { display: block; margin-top: 4px; font-style: normal; font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--bone-3); }
.nav-dd__item > i { font-style: normal; color: var(--bone-3); transform: translateX(-4px); opacity: 0; transition: transform var(--d-mid) var(--e-out), opacity var(--d-fast), color var(--d-fast); }
.nav-dd__item:hover > i { transform: none; opacity: 1; color: var(--accent); }

/* right side: live status + Engage */
.nav-right { display: flex; align-items: center; gap: 14px; z-index: 2; }
.nav-status { display: inline-flex; align-items: center; gap: 8px; font-size: 10px; letter-spacing: .18em; text-transform: uppercase; color: var(--bone-2); }
.nav-status > i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent); animation: navPing 2.2s infinite; }
.nav-status__t { color: var(--bone-3); font-variant-numeric: tabular-nums; padding-left: 8px; box-shadow: inset 1px 0 0 var(--line-2); }
@keyframes navPing { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent); } 80%, 100% { box-shadow: 0 0 0 7px transparent; } }
.nav-cta { overflow: hidden; isolation: isolate; }
.nav-cta::before { content: ""; position: absolute; inset: 0; z-index: -1; background: var(--accent); transform: translateY(101%); transition: transform .45s var(--e-out); }
.nav-cta:hover::before { transform: none; }
.nav-cta:hover { color: var(--accent-ink); }
.nav-cta i { transition: transform .45s var(--e-out); }
.nav-cta:hover i { transform: translate(2px, -2px); }
@media (max-width: 1320px) { .nav-a { padding: 0 13px; } }
/* mid-size screens: links sit between logo and Engage (still centred in the free space) so they never overlap the logo */
@media (min-width: 1081px) and (max-width: 1380px) { .nav-links { position: relative; left: auto; top: auto; transform: none; margin-inline: auto; } }

.burger { display: none; width: 44px; height: 44px; position: relative; z-index: 2; }
.burger span { position: absolute; left: 11px; right: 11px; height: 1.5px; background: var(--bone); transition: transform var(--d-mid) var(--e-out), top var(--d-mid) var(--e-out), width var(--d-mid); }
.burger span:nth-child(1) { top: 18px; } .burger span:nth-child(2) { top: 25px; width: 14px; }
.menu-open .burger span:nth-child(1) { top: 21px; transform: rotate(45deg); }
.menu-open .burger span:nth-child(2) { top: 21px; width: 22px; transform: rotate(-45deg); }

.nav-a--m { display: none; }   /* "Engage" inside the phone menu (desktop shows the button instead) */
/* phones / tablets: full-screen menu */
@media (max-width: 1080px) {
  .burger { display: block; }
  .nav-links {
    position: fixed; inset: 0; height: auto; transform: none; flex-direction: column; align-items: stretch; justify-content: center;
    gap: 0; padding: 100px var(--gut) 48px; background: var(--deep); box-shadow: none; backdrop-filter: none;
    clip-path: inset(0 0 100% 0); transition: clip-path .7s var(--e-io); visibility: hidden;
  }
  .nav-links::before, .nav-links::after, .nav-ind { display: none; }
  .menu-open .nav-links { clip-path: inset(0); visibility: visible; }
  .nav-dd { display: block; }
  .nav-dd__panel { display: none; }
  .nav-a {
    width: 100%; height: auto; padding: 16px 0; border-bottom: 1px solid var(--line); color: var(--bone); box-shadow: none !important; background: none !important;
    font-family: var(--f-display); font-size: clamp(30px, 8vw, 54px); font-weight: 300; letter-spacing: var(--track-display);
    opacity: 0; transform: translateY(20px); transition: opacity .5s var(--e-out), transform .5s var(--e-out);
  }
  .nav-caret { display: none; }
  .menu-open .nav-a { opacity: 1; transform: none; transition-delay: calc(.12s + var(--i, 0) * .045s); }
  .nav-a[aria-current="page"] { color: var(--accent); }
  .nav-a--m { display: flex; color: var(--accent); }
  .nav-right .btn, .nav-status { display: none; }
}

/* ---------------- HUD micro-telemetry ---------------- */
.hud { position: fixed; z-index: 60; color: var(--bone-3); pointer-events: none; display: flex; align-items: center; gap: 9px; }
.hud--bl { left: var(--gut); bottom: 22px; }
.hud--br { right: var(--gut); bottom: 22px; }
.blip { width: 6px; height: 6px; border-radius: 50%; background: var(--nvg); box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 55%, transparent); animation: blip 2.4s infinite; }
@keyframes blip { 70% { box-shadow: 0 0 0 8px color-mix(in srgb, var(--ok) 0%, transparent); } 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 0%, transparent); } }
@media (max-width: 860px) { .hud { display: none; } }

/* ---------------- section divider (the page's connective tissue) ------- */
.divider { display: grid; grid-template-columns: auto auto 1fr auto; align-items: center; gap: 20px; padding-block: 22px; }
.divider__idx { font-family: var(--f-mono); font-size: var(--t-mono); letter-spacing: .14em; color: var(--ember); }
.divider__label { font-family: var(--f-mono); font-size: var(--t-mono); letter-spacing: .2em; text-transform: uppercase; color: var(--bone); }
.divider__rule { position: relative; height: 1px; background: linear-gradient(90deg, var(--line-2), var(--line) 70%, transparent); }
.divider__rule::after { content: ""; position: absolute; top: -2px; left: 0; width: 5px; height: 5px; background: var(--ember); box-shadow: 0 0 10px var(--ember); animation: runDot 5.5s var(--e-io) infinite; }
@keyframes runDot { 0% { left: 0; opacity: 0; } 12% { opacity: 1; } 86% { opacity: 1; } 100% { left: 100%; opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .divider__rule::after { animation: none; opacity: .6; } }
.divider__meta { font-family: var(--f-mono); font-size: var(--t-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--bone-3); text-align: right; }
.divider--ticked { position: relative; }
.divider--ticked::before, .divider--ticked::after { content: ""; position: absolute; top: 50%; width: 9px; height: 9px; border: 1px solid var(--line-2); transform: translateY(-50%) rotate(45deg); }
.divider--ticked::before { left: -4px; } .divider--ticked::after { right: -4px; }
@media (max-width: 720px) { .divider { grid-template-columns: auto 1fr; gap: 12px; } .divider__meta { display: none; } }

/* big chapter marker */
.chapter-mark { display: flex; align-items: baseline; gap: 26px; border-top: 1px solid var(--line-2); padding-top: 24px; }
.chapter-mark b { font: var(--w-display) clamp(56px, 8vw, 128px)/.8 var(--f-display); color: transparent; -webkit-text-stroke: 1.5px var(--line-2); }
.chapter-mark span { font-family: var(--f-mono); font-size: var(--t-mono); letter-spacing: .2em; text-transform: uppercase; color: var(--bone-3); }

/* ---------------- page header (inner pages) ---------------- */
.phead { padding-top: calc(var(--nav-h) + clamp(52px, 7vw, 104px)); padding-bottom: clamp(40px, 4.4vw, 66px); position: relative; overflow: hidden; }
.crumbs { display: flex; gap: 10px; color: var(--bone-3); margin-bottom: 28px; }
.crumbs a:hover { color: var(--ember); }
.phead__grid { display: grid; grid-template-columns: 1.45fr 1fr; gap: 44px 72px; align-items: end; margin-top: 38px; }
.spec { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--bone-4); }
.spec > div { padding: 15px 0; border-bottom: 1px solid var(--line); }
.spec dt { font-family: var(--f-mono); font-size: var(--t-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--bone-3); margin-bottom: 7px; }
.spec dd { margin: 0; font-size: 15px; font-weight: 500; }
@media (max-width: 900px) { .phead__grid { grid-template-columns: 1fr; } }

/* ---------------- footer ---------------- */
.site-footer { background: var(--deep); border-top: 1px solid var(--line); padding-top: clamp(60px, 7vw, 110px); overflow: hidden; }
.foot-top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.1fr; gap: 44px; padding-bottom: 56px; }
.foot-top h5 { margin: 0 0 18px; font-family: var(--f-mono); font-size: var(--t-mono); letter-spacing: .18em; text-transform: uppercase; color: var(--bone-3); font-weight: 500; }
.foot-top ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 11px; }
.foot-top a { color: var(--bone-2); transition: color var(--d-fast), padding-left var(--d-fast); }
.foot-top a:hover { color: var(--ember); padding-left: 5px; }
.foot-blurb { margin-top: 20px; max-width: 36ch; color: var(--bone-2); font-size: 15px; }
.foot-word { font: var(--w-display) clamp(70px, 17.5vw, 290px)/.78 var(--f-display); letter-spacing: var(--track-display); color: transparent; -webkit-text-stroke: 1px var(--line); white-space: nowrap; text-align: center; user-select: none; margin-block: 10px -.1em; }
.foot-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; padding-block: 24px; border-top: 1px solid var(--line); color: var(--bone-3); }
.foot-status { display: inline-flex; align-items: center; gap: 9px; }
@media (max-width: 980px) { .foot-top { grid-template-columns: 1fr 1fr; } .foot-top > :first-child { grid-column: 1 / -1; } }

/* ---------------- page transition curtain ---------------- */
.curtain { position: fixed; inset: 0; z-index: 100; pointer-events: none; display: grid; grid-template-columns: repeat(7, 1fr); }
.curtain i { background: var(--deep); transform: scaleY(0); transform-origin: top; }
.curtain b { position: absolute; left: 50%; top: 50%; translate: -50% -50%; opacity: 0; color: var(--bone-3); font-weight: 400; }
html.is-exit .curtain i { transform: scaleY(1); transition: transform .5s var(--e-io); }
html.is-exit .curtain i:nth-child(2) { transition-delay: .035s } html.is-exit .curtain i:nth-child(3) { transition-delay: .07s }
html.is-exit .curtain i:nth-child(4) { transition-delay: .105s } html.is-exit .curtain i:nth-child(5) { transition-delay: .14s }
html.is-exit .curtain i:nth-child(6) { transition-delay: .175s } html.is-exit .curtain i:nth-child(7) { transition-delay: .21s }
html.is-exit .curtain b { opacity: 1; transition: opacity .25s .25s; }
html.is-enter .curtain i { transform: scaleY(1); transform-origin: bottom; }
html.is-enter .curtain.go i { transform: scaleY(0); transition: transform .75s var(--e-io); }
html.is-enter .curtain.go i:nth-child(2) { transition-delay: .035s } html.is-enter .curtain.go i:nth-child(3) { transition-delay: .07s }
html.is-enter .curtain.go i:nth-child(4) { transition-delay: .105s } html.is-enter .curtain.go i:nth-child(5) { transition-delay: .14s }
html.is-enter .curtain.go i:nth-child(6) { transition-delay: .175s } html.is-enter .curtain.go i:nth-child(7) { transition-delay: .21s }

/* ---------------- reticle cursor (desktop pointer only) ---------------- */
.cursor { position: fixed; left: 0; top: 0; z-index: 90; pointer-events: none; display: none; mix-blend-mode: difference; }
.cursor__r { position: absolute; width: 30px; height: 30px; margin: -15px 0 0 -15px; border: 1px solid #fff; border-radius: 50%; transition: width var(--d-fast) var(--e-out), height var(--d-fast) var(--e-out), margin var(--d-fast) var(--e-out), opacity var(--d-fast); }
.cursor__d { position: absolute; width: 3px; height: 3px; margin: -1.5px 0 0 -1.5px; background: #fff; }
.cursor__t { position: absolute; left: 26px; top: 12px; white-space: nowrap; font-family: var(--f-mono); font-size: 9.5px; letter-spacing: .14em; text-transform: uppercase; color: #fff; }
.cursor.is-hot .cursor__r { width: 58px; height: 58px; margin: -29px 0 0 -29px; }
@media (hover: hover) and (pointer: fine) {
  .has-cursor .cursor { display: block; }
  .has-cursor, .has-cursor a, .has-cursor button { cursor: none; }
  .has-cursor input, .has-cursor textarea, .has-cursor select { cursor: text; }
}

/* ---------------- boot sequence (home, once per visit) ---------------- */
.boot { position: fixed; inset: 0; z-index: 110; background: var(--deep); display: grid; place-items: center; transition: clip-path .85s var(--e-io); clip-path: inset(0); }
.boot.is-done { clip-path: inset(0 0 100% 0); }
.boot__in { width: min(420px, 82vw); }
.boot__head { display: flex; justify-content: space-between; color: var(--bone-3); margin-bottom: 20px; }
.boot__lines { min-height: 132px; color: var(--bone-2); line-height: 2.05; }
.boot__lines span { display: block; }
.boot__lines em { float: right; font-style: normal; color: var(--nvg); }
.boot__bar { height: 1.5px; background: var(--line-2); margin-top: 16px; }
.boot__bar i { display: block; height: 100%; width: 0; background: var(--ember); transition: width .22s linear; }

/* decorative radar motif behind every inner-page header */
.phead { isolation: isolate; }
.phead .wrap { position: relative; z-index: 2; }
.phead::before, .phead::after {
  content: ""; position: absolute; right: -7vw; top: 22%; width: min(44vw, 580px); aspect-ratio: 1;
  border-radius: 50%; z-index: 0; pointer-events: none;
  -webkit-mask-image: radial-gradient(circle, #000 36%, transparent 70%); mask-image: radial-gradient(circle, #000 36%, transparent 70%);
}
.phead::before { background: repeating-radial-gradient(circle, transparent 0 45px, var(--line-3) 46px 47px); animation: spin 90s linear infinite; }
.phead::after { background: conic-gradient(from 0deg, color-mix(in srgb, var(--accent) 16%, transparent), transparent 58deg); animation: spin 8.5s linear infinite; }
.phead .spec { position: relative; z-index: 2; background: linear-gradient(90deg, color-mix(in srgb, var(--void) 75%, transparent), color-mix(in srgb, var(--void) 30%, transparent)); }
@media (prefers-reduced-motion: reduce) { .phead::before, .phead::after { animation: none; } }
@media (max-width: 760px) { .phead::before, .phead::after { display: none; } }