/* ==========================================================================
   EXOSTACK — design system
   Palette derived from the product itself: anodised aluminium greys, the
   cobalt of the PTFE duct, safety orange reserved exclusively for actions.
   One grotesque superfamily (Archivo) varied by width; IBM Plex Mono for
   every number, dimension and material code.
   ========================================================================== */

:root{
  /* Surfaces — cool aluminium */
  --paper:#FFFFFF;
  --shell:#ECEFF3;
  --shell-2:#F5F7F9;
  --deck:#0B1622;
  --deck-2:#132537;

  /* Ink */
  --ink:#0B1622;
  --ink-2:#4B5D70;
  --ink-3:#8396A8;
  --on-deck:#E9EEF3;
  --on-deck-2:#93A9BD;
  --on-deck-3:#61798E;

  /* Rules */
  --line:#D6DDE4;
  --line-2:#BAC5D0;
  --line-deck:rgba(255,255,255,.13);
  --line-deck-2:rgba(255,255,255,.26);

  /* Brand — the duct */
  --stack:#1B5E8E;
  --stack-deep:#0E3E60;
  --stack-tint:#E8F1F7;
  --stack-line:#B5D0E3;

  /* Signal — actions only */
  --signal:#D2440B;
  --signal-hi:#EE5C18;
  --signal-tint:#FDEDE4;
  --signal-line:#F3C8B1;

  /* Data semantics */
  --pos:#0E6A43; --pos-tint:#E5F2EB; --pos-line:#B2D6C4;
  --neg:#9B2C2C; --neg-tint:#F8EAEA; --neg-line:#E2BEBE;
  --warn:#875000; --warn-tint:#FBF1E1; --warn-line:#EAD3A8;

  /* Type */
  --sans:'Archivo','Helvetica Neue',Helvetica,Arial,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,monospace;

  /* Metrics */
  --r:3px;
  --r-lg:5px;
  --gut:clamp(1.25rem,4vw,2.5rem);
  --max:1280px;
  --max-text:70ch;
  --head-h:64px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ── Reset ─────────────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--head-h) + 16px)}
body{
  background:var(--shell);color:var(--ink);
  font-family:var(--sans);font-size:16.5px;line-height:1.6;
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
[hidden]{display:none!important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}
img,svg{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:2px}
::selection{background:var(--stack);color:#fff}

/* ── Type ──────────────────────────────────────────────────────────────── */
h1,h2,h3,h4,h5{font-family:var(--sans);font-stretch:118%;font-weight:650;line-height:1.06;letter-spacing:-.018em;text-wrap:balance}
h1{font-size:clamp(2.25rem,4.6vw,3.6rem)}
h2{font-size:clamp(1.75rem,3vw,2.5rem);line-height:1.08}
h3{font-size:clamp(1.15rem,1.9vw,1.4rem);line-height:1.18;letter-spacing:-.012em}
h4{font-size:1rem;font-stretch:110%;font-weight:600;line-height:1.25;letter-spacing:-.006em}
h5{font-size:.9rem;font-stretch:105%;font-weight:600;letter-spacing:-.004em}
p{text-wrap:pretty}
strong{font-weight:650}

.lede{font-size:clamp(1.02rem,1.5vw,1.16rem);line-height:1.62;color:var(--ink-2);max-width:60ch}
.body-lg{font-size:1.03rem;line-height:1.68;color:var(--ink-2)}
.muted{color:var(--ink-2)}
.dim{color:var(--ink-3)}

/* Eyebrow — the drawing-sheet label */
.eyebrow{
  display:flex;align-items:center;gap:.6rem;
  font-family:var(--mono);font-size:.665rem;font-weight:500;
  letter-spacing:.19em;text-transform:uppercase;color:var(--stack);
  margin-bottom:1.05rem;
}
.eyebrow::before{content:'';width:22px;height:1px;background:var(--stack);flex:none;opacity:.55}
.eyebrow--deck{color:var(--on-deck-2)}
.eyebrow--deck::before{background:var(--on-deck-2)}

.mono{font-family:var(--mono);font-variant-numeric:tabular-nums slashed-zero}
.num{font-family:var(--mono);font-weight:500;font-variant-numeric:tabular-nums slashed-zero;letter-spacing:-.01em}


/* Heading-level utilities: keep the visual scale when the semantic level
   has to change to avoid skipping a level. */
.hd-2{font-size:clamp(1.75rem,3vw,2.5rem);line-height:1.08;font-stretch:118%;font-weight:650}
.hd-3{font-size:clamp(1.15rem,1.9vw,1.4rem);line-height:1.18;letter-spacing:-.012em;font-stretch:118%;font-weight:650}
.hd-4{font-size:1rem;font-stretch:110%;font-weight:600;line-height:1.25;letter-spacing:-.006em}
.hd-5{font-size:.9rem;font-stretch:105%;font-weight:600;letter-spacing:-.004em}

/* ── Layout ────────────────────────────────────────────────────────────── */
.shell{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gut)}
.shell--narrow{max-width:940px}
.band{padding-block:clamp(3rem,5.4vw,5rem)}
.band--tight{padding-block:clamp(2.25rem,4vw,3.5rem)}
.band--paper{background:var(--paper)}
.band--shell2{background:var(--shell-2)}
.band--deck{background:var(--deck);color:var(--on-deck)}
.band--deck h1,.band--deck h2,.band--deck h3,.band--deck h4{color:var(--on-deck)}
.band--deck .lede,.band--deck .muted{color:var(--on-deck-2)}
.hr{height:1px;background:var(--line);border:0}

.head-block{max-width:58ch;margin-bottom:clamp(1.75rem,3.2vw,2.75rem)}
.head-block p{margin-top:.9rem;color:var(--ink-2);font-size:1.02rem;line-height:1.65}
.band--deck .head-block p{color:var(--on-deck-2)}

.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(2rem,5vw,4.5rem);align-items:start}
.split--center{align-items:center}
.split--40{grid-template-columns:minmax(0,.78fr) minmax(0,1fr)}
.split--form{grid-template-columns:minmax(0,1.55fr) minmax(0,.85fr);gap:clamp(1.5rem,3vw,2.5rem)}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(1rem,1.8vw,1.5rem)}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(1rem,1.8vw,1.5rem)}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(.85rem,1.5vw,1.25rem)}
.stack-y{display:flex;flex-direction:column;gap:1rem}

/* ── Buttons ───────────────────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.78rem 1.4rem;border:1px solid transparent;border-radius:var(--r);
  font-size:.875rem;font-weight:600;font-stretch:104%;letter-spacing:-.004em;
  line-height:1;cursor:pointer;white-space:nowrap;
  transition:background .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease),transform .16s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn .arw{transition:transform .18s var(--ease)}
.btn:hover .arw{transform:translateX(3px)}

.btn--primary{background:var(--signal);color:#fff}
.btn--primary:hover{background:var(--signal-hi)}
.btn--ink{background:var(--ink);color:#fff}
.btn--ink:hover{background:#1d3348}
.btn--outline{border-color:var(--line-2);color:var(--ink);background:transparent}
.btn--outline:hover{border-color:var(--ink);background:var(--paper)}
.btn--ghost-deck{border-color:var(--line-deck-2);color:var(--on-deck);background:transparent}
.btn--ghost-deck:hover{border-color:var(--on-deck);background:rgba(255,255,255,.07)}
.btn--sm{padding:.55rem 1rem;font-size:.8rem}
.btn--lg{padding:.95rem 1.7rem;font-size:.94rem}
.btn--block{width:100%}
.btn[disabled]{opacity:.45;pointer-events:none}

.link-arrow{
  display:inline-flex;align-items:center;gap:.4rem;
  font-family:var(--mono);font-size:.73rem;font-weight:500;letter-spacing:.06em;
  text-transform:uppercase;color:var(--stack);
  border-bottom:1px solid var(--stack-line);padding-bottom:2px;
  transition:border-color .16s var(--ease),gap .16s var(--ease);
}
.link-arrow:hover{border-color:var(--stack);gap:.62rem}
.link-arrow--deck{color:#7FB6DC;border-color:rgba(127,182,220,.35)}
.link-arrow--deck:hover{border-color:#7FB6DC}

/* ── Chips ─────────────────────────────────────────────────────────────── */
.chip{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.2rem .55rem;border-radius:2px;border:1px solid;
  font-family:var(--mono);font-size:.645rem;font-weight:500;letter-spacing:.055em;
  text-transform:uppercase;white-space:nowrap;
}
.chip--stack{background:var(--stack-tint);color:var(--stack);border-color:var(--stack-line)}
.chip--pos{background:var(--pos-tint);color:var(--pos);border-color:var(--pos-line)}
.chip--neg{background:var(--neg-tint);color:var(--neg);border-color:var(--neg-line)}
.chip--warn{background:var(--warn-tint);color:var(--warn);border-color:var(--warn-line)}
.chip--signal{background:var(--signal-tint);color:var(--signal);border-color:var(--signal-line)}
.chip--quiet{background:var(--shell);color:var(--ink-2);border-color:var(--line)}
.chip--deck{background:rgba(255,255,255,.07);color:var(--on-deck-2);border-color:var(--line-deck-2)}
.chip-row{display:flex;flex-wrap:wrap;gap:.35rem}

/* ── Header ────────────────────────────────────────────────────────────── */
.utility{
  background:var(--deck);color:var(--on-deck-3);
  font-family:var(--mono);font-size:.665rem;letter-spacing:.09em;text-transform:uppercase;
}
.utility .shell{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:32px}
.utility-facts{display:flex;gap:1.1rem;align-items:center;min-width:0}
.utility-facts span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.utility-facts b{color:var(--on-deck-2);font-weight:500}
.utility a{color:var(--on-deck-2);transition:color .16s var(--ease)}
.utility a:hover{color:#fff}

.masthead{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.masthead .shell{display:flex;align-items:center;gap:1.5rem;height:var(--head-h)}
.wordmark{display:flex;align-items:baseline;gap:.5rem;flex:none}
.wordmark-txt{font-stretch:122%;font-weight:750;font-size:1.16rem;letter-spacing:-.026em;color:var(--ink)}
.wordmark-txt em{font-style:normal;color:var(--stack)}
.wordmark-rule{width:1px;height:15px;background:var(--line-2);align-self:center}
.wordmark-sub{font-family:var(--mono);font-size:.6rem;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);white-space:nowrap}

.nav{display:flex;align-items:center;gap:.15rem;margin-left:auto}
.nav a{
  padding:.5rem .68rem;border-radius:var(--r);font-size:.855rem;font-weight:500;
  color:var(--ink-2);transition:color .16s var(--ease),background .16s var(--ease);
}
.nav a:hover{color:var(--ink);background:var(--shell)}
.nav a[aria-current="page"]{color:var(--ink);font-weight:600;box-shadow:inset 0 -2px 0 var(--signal)}
.head-cta{display:flex;align-items:center;gap:.55rem;flex:none}

.burger{display:none;flex:none;width:40px;height:40px;align-items:center;justify-content:center;background:transparent;border:1px solid var(--line);border-radius:var(--r);cursor:pointer;margin-left:auto}
.burger span{display:block;width:17px;height:1.5px;background:var(--ink);position:relative;transition:transform .2s var(--ease),background .2s var(--ease)}
.burger span::before,.burger span::after{content:'';position:absolute;left:0;width:17px;height:1.5px;background:var(--ink);transition:transform .2s var(--ease),top .2s var(--ease)}
.burger span::before{top:-5.5px}.burger span::after{top:5.5px}
.burger[aria-expanded="true"] span{background:transparent}
.burger[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.burger[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

.mobile-nav{display:none;position:fixed;inset:0;z-index:79;background:var(--paper);padding:calc(var(--head-h) + 44px) var(--gut) 2.5rem;overflow-y:auto;flex-direction:column;gap:.15rem}
.mobile-nav.open{display:flex}
.mobile-nav a{padding:.9rem 0;border-bottom:1px solid var(--line);font-size:1.05rem;font-weight:600;font-stretch:108%;display:flex;justify-content:space-between;align-items:center}
.mobile-nav a .mono{font-size:.68rem;color:var(--ink-3);font-weight:400}
.mobile-nav .btn{margin-top:1.25rem}

/* ── Hero ──────────────────────────────────────────────────────────────── */
.hero{position:relative;background:var(--deck);color:var(--on-deck);overflow:hidden}
.hero-media{position:absolute;inset:0}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:58% 42%}
.hero-scrim{
  position:absolute;inset:0;
  background:
    linear-gradient(96deg,rgba(7,16,26,.955) 0%,rgba(7,16,26,.9) 26%,rgba(7,16,26,.6) 50%,rgba(7,16,26,.24) 72%,rgba(7,16,26,.42) 100%),
    linear-gradient(to top,rgba(7,16,26,.88) 0%,rgba(7,16,26,0) 34%);
}
.hero-annotate{position:absolute;inset:0;pointer-events:none}
.hero-body{position:relative;z-index:3;padding-block:clamp(3.5rem,8vw,6.5rem) clamp(2rem,4vw,3rem)}
.hero-inner{max-width:38rem}
.hero h1{color:#fff;margin-bottom:1.15rem;text-shadow:0 1px 30px rgba(7,16,26,.5)}
.hero h1 em{font-style:normal;color:#FF9A5C}
.hero-sub{font-size:clamp(1rem,1.4vw,1.11rem);line-height:1.62;color:#C6D5E2;max-width:34rem;margin-bottom:1.9rem}
.hero-acts{display:flex;flex-wrap:wrap;gap:.7rem;margin-bottom:1.5rem}
.hero-trust{display:flex;flex-wrap:wrap;gap:.6rem 1.15rem;font-family:var(--mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;color:var(--on-deck-2)}
.hero-trust span{display:flex;align-items:center;gap:.4rem}
.hero-trust span::before{content:'';width:4px;height:4px;background:#5BA3D0;border-radius:50%;flex:none}

/* Title block — the drawing-sheet strip under the hero */
.titleblock{position:relative;z-index:3;border-top:1px solid var(--line-deck-2);background:rgba(7,16,26,.55);backdrop-filter:blur(6px)}
.titleblock-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.tb-cell{padding:1.05rem clamp(.9rem,2vw,1.6rem);border-left:1px solid var(--line-deck)}
.tb-cell:first-child{border-left:0;padding-left:0}
.tb-k{font-family:var(--mono);font-size:.615rem;letter-spacing:.14em;text-transform:uppercase;color:var(--on-deck-3);margin-bottom:.4rem}
.tb-v{font-family:var(--mono);font-size:clamp(1.25rem,2.3vw,1.65rem);font-weight:500;color:#fff;line-height:1;letter-spacing:-.02em;margin-bottom:.3rem}
.tb-v small{font-size:.62em;color:var(--on-deck-2);font-weight:400}
.tb-n{font-size:.755rem;line-height:1.35;color:var(--on-deck-2)}

/* CAD annotation styling */
.anno line,.anno path,.anno circle,.anno rect{vector-effect:non-scaling-stroke}
.anno text{font-family:var(--mono);font-weight:500;letter-spacing:.06em}
.anno .a-lead{stroke:#FF9A5C;stroke-width:1}
.anno .a-node{fill:#FF9A5C}
.anno .a-plate{fill:rgba(7,16,26,.8);stroke:rgba(255,154,92,.45);stroke-width:1}
.anno .a-t1{fill:#FFB782;font-size:12.5px}
.anno .a-t2{fill:#9FB6C8;font-size:11px;letter-spacing:.04em}

/* draw-in choreography */
.anno .grp{opacity:0}
.js-ready .anno .grp{animation:annoIn .55s var(--ease) forwards}
.js-ready .anno .grp:nth-child(1){animation-delay:.45s}
.js-ready .anno .grp:nth-child(2){animation-delay:.62s}
.js-ready .anno .grp:nth-child(3){animation-delay:.79s}
@keyframes annoIn{from{opacity:0;transform:translateX(-7px)}to{opacity:1;transform:none}}

/* ── Page header (interior pages) ──────────────────────────────────────── */
.pagehead{background:var(--deck);color:var(--on-deck);padding-block:clamp(2.25rem,4vw,3.25rem) clamp(2.25rem,4vw,3.25rem);position:relative;overflow:hidden}
.pagehead::after{
  content:'';position:absolute;inset:0;pointer-events:none;opacity:.9;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(120% 90% at 78% 20%,#000 0%,transparent 72%);
  mask-image:radial-gradient(120% 90% at 78% 20%,#000 0%,transparent 72%);
}
.pagehead .shell{position:relative;z-index:2}
.pagehead h1{color:#fff;max-width:20ch;margin-bottom:1rem}
.pagehead .lede{color:var(--on-deck-2);max-width:58ch}
.crumbs{display:flex;align-items:center;gap:.5rem;font-family:var(--mono);font-size:.665rem;letter-spacing:.13em;text-transform:uppercase;color:var(--on-deck-3);margin-bottom:1.35rem}
.crumbs a{transition:color .16s var(--ease)}
.crumbs a:hover{color:var(--on-deck)}
.crumbs span{opacity:.5}

/* ── Cards ─────────────────────────────────────────────────────────────── */
.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(1.25rem,2.2vw,1.75rem);
  transition:border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.card--hover:hover{border-color:var(--line-2);transform:translateY(-2px);box-shadow:0 8px 24px -14px rgba(11,22,34,.28)}
.card--deck{background:rgba(255,255,255,.038);border-color:var(--line-deck)}
.card--deck:hover{border-color:var(--line-deck-2)}
.card h3{margin-bottom:.5rem}
.card h4{margin-bottom:.45rem}
.card p{font-size:.905rem;line-height:1.62;color:var(--ink-2)}
.card--deck p{color:var(--on-deck-2)}
.card-top{border-top:2px solid var(--stack)}
.card-top--neg{border-top-color:var(--neg)}
.card-top--pos{border-top-color:var(--pos)}
.card-top--signal{border-top-color:var(--signal)}

.card-tag{
  font-family:var(--mono);font-size:.615rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink-3);margin-bottom:.85rem;display:block;
}
.card--deck .card-tag{color:var(--on-deck-3)}

.cost-flag{
  display:inline-flex;align-items:center;gap:.4rem;margin-top:1rem;
  font-family:var(--mono);font-size:.735rem;font-weight:500;
  padding:.3rem .6rem;border-radius:2px;
  background:var(--neg-tint);color:var(--neg);border:1px solid var(--neg-line);
}
.cost-flag--pos{background:var(--pos-tint);color:var(--pos);border-color:var(--pos-line)}

/* ── Data rows & tables ────────────────────────────────────────────────── */
.datarow{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;padding:.6rem 0;border-bottom:1px solid var(--line);font-size:.885rem}
.datarow:last-child{border-bottom:0}
.datarow dt,.datarow .k{color:var(--ink-2);min-width:0}
.datarow dd,.datarow .v{font-family:var(--mono);font-size:.815rem;font-weight:500;text-align:right;letter-spacing:-.01em;white-space:nowrap;flex:none}
.datarow .v--pos{color:var(--pos)}
.datarow .v--stack{color:var(--stack)}
.datarow .v--neg{color:var(--neg)}
.datarow--total{border-top:1px solid var(--line-2);border-bottom:0;margin-top:.4rem;padding-top:.85rem}
.datarow--total .k{color:var(--ink);font-weight:650}
.datarow--total .v{font-size:1.08rem;color:var(--pos);font-weight:600}

.table-wrap{border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:var(--paper)}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
table.data{width:100%;border-collapse:collapse;min-width:640px}
table.data.is-compact{min-width:0}
table.data.is-compact th,table.data.is-compact td{padding-inline:.85rem}
table.data th{
  text-align:left;padding:.7rem 1.1rem;background:var(--shell-2);
  font-family:var(--mono);font-size:.625rem;font-weight:500;letter-spacing:.13em;
  text-transform:uppercase;color:var(--ink-3);border-bottom:1px solid var(--line);white-space:nowrap;
}
table.data th.is-rec{color:var(--stack);background:var(--stack-tint)}
table.data td{padding:.7rem 1.1rem;font-size:.875rem;border-bottom:1px solid var(--line);vertical-align:top}
table.data tbody tr:last-child td{border-bottom:0}
table.data tbody tr:nth-child(even) td{background:rgba(11,22,34,.014)}
table.data td:first-child{color:var(--ink-2)}
table.data td:not(:first-child){font-family:var(--mono);font-size:.795rem;letter-spacing:-.01em}
table.data td.is-rec{background:var(--stack-tint)!important;color:var(--stack)}
table.data .t-pos{color:var(--pos);font-weight:500}
table.data .t-neg{color:var(--neg)}
table.data caption{caption-side:bottom;padding:.75rem 1.1rem;font-size:.755rem;color:var(--ink-3);text-align:left;border-top:1px solid var(--line);background:var(--shell-2)}

/* ── Callouts ──────────────────────────────────────────────────────────── */
.note{border:1px solid var(--line);border-left:2px solid var(--stack);border-radius:var(--r);padding:1rem 1.15rem;background:var(--shell-2)}
.note h4{font-size:.87rem;margin-bottom:.35rem;color:var(--stack)}
.note p{font-size:.855rem;line-height:1.6;color:var(--ink-2)}
.note--pos{border-left-color:var(--pos);background:var(--pos-tint)}
.note--pos h4{color:var(--pos)}
.note--neg{border-left-color:var(--neg);background:var(--neg-tint)}
.note--neg h4{color:var(--neg)}
.note--warn{border-left-color:var(--warn);background:var(--warn-tint)}
.note--warn h4{color:var(--warn)}

/* ── Sequence rail (installation) ──────────────────────────────────────── */
.seq{position:relative;display:flex;flex-direction:column;gap:1rem}
.seq::before{content:'';position:absolute;left:41px;top:14px;bottom:80px;width:1px;background:linear-gradient(var(--line-2) 70%,transparent);z-index:0}
.seq-item{display:grid;grid-template-columns:84px minmax(0,1fr);gap:clamp(.85rem,2vw,1.5rem);position:relative;z-index:1}
.seq-clock{
  font-family:var(--mono);font-size:.83rem;font-weight:600;color:var(--stack);
  background:var(--shell);border:1px solid var(--stack-line);border-radius:2px;
  padding:.32rem 0;text-align:center;height:fit-content;letter-spacing:-.01em;
}
.seq-elapsed{display:block;font-size:.6rem;font-weight:400;color:var(--ink-3);letter-spacing:.1em;text-transform:uppercase;margin-top:.2rem}
.band--paper .seq-clock{background:var(--paper)}
.seq-item--done .seq-clock{background:var(--pos-tint);border-color:var(--pos-line);color:var(--pos)}
.seq-body{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);padding:1.15rem 1.35rem}
.band--paper .seq-body{background:var(--shell-2)}
.seq-body h3{font-size:1.02rem;margin-bottom:.4rem}
.seq-body p{font-size:.895rem;line-height:1.63;color:var(--ink-2);margin-bottom:.8rem}
.seq-meta{display:flex;flex-wrap:wrap;gap:.4rem}

/* ── Anatomy diagram (system page) ─────────────────────────────────────── */
.anatomy{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(1.5rem,4vw,3.5rem);align-items:start}
.anatomy-fig{position:sticky;top:calc(var(--head-h) + 24px);background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);padding:1rem;overflow:hidden}
.anatomy-fig svg{width:100%;height:auto}
.anatomy-cap{display:flex;justify-content:space-between;gap:1rem;border-top:1px solid var(--line);margin-top:.75rem;padding-top:.65rem;font-family:var(--mono);font-size:.63rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3)}
.layer-list{display:flex;flex-direction:column;gap:.6rem}
.layer{
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:1rem;align-items:start;
  background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:1.1rem 1.3rem;cursor:default;
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.layer:hover,.layer.is-active{border-color:var(--stack);box-shadow:0 0 0 1px var(--stack-line)}
.layer-key{
  font-family:var(--mono);font-size:.66rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
  padding:.28rem .5rem;border-radius:2px;white-space:nowrap;border:1px solid;height:fit-content;margin-top:.1rem;
}
.layer h4{margin-bottom:.3rem}
.layer p{font-size:.87rem;line-height:1.6;color:var(--ink-2)}
.layer-spec{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.7rem}

/* diagram part highlight states */
.dwg .part{transition:opacity .22s var(--ease)}
.dwg.is-focus .part{opacity:.16}
.dwg.is-focus .part.is-lit{opacity:1}

/* ── Comparison bars (economics) ───────────────────────────────────────── */
.barset{display:flex;flex-direction:column;gap:1.5rem}
.bar-head{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;margin-bottom:.45rem}
.bar-name{font-size:.9rem;font-weight:600}
.bar-name small{display:block;font-weight:400;font-size:.755rem;color:var(--ink-3);margin-top:.1rem}
.bar-total{font-family:var(--mono);font-size:.95rem;font-weight:600;letter-spacing:-.015em;white-space:nowrap}
.bar-track{height:40px;display:flex;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--shell-2)}
.bar-seg{
  height:100%;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:.63rem;font-weight:500;color:#fff;
  white-space:nowrap;overflow:hidden;width:0;
  transition:width .85s var(--ease);
}
.legend{display:flex;flex-wrap:wrap;gap:.6rem 1.35rem;padding:.9rem 1.1rem;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg)}
.legend-item{display:flex;align-items:center;gap:.45rem;font-size:.78rem;color:var(--ink-2)}
.legend-swatch{width:11px;height:11px;border-radius:2px;flex:none}

/* ── Big figure ────────────────────────────────────────────────────────── */
.figure-block{background:var(--paper);border:1px solid var(--line);border-left:3px solid var(--pos);border-radius:var(--r-lg);padding:clamp(1.4rem,2.6vw,2rem)}
.figure-val{font-family:var(--mono);font-size:clamp(2.4rem,5.5vw,3.5rem);font-weight:600;color:var(--pos);line-height:.95;letter-spacing:-.035em;margin-bottom:.55rem}
.figure-block p{font-size:.93rem;line-height:1.6;color:var(--ink-2);margin-bottom:1.1rem}

/* ── Calculator / selector ─────────────────────────────────────────────── */
.tool{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.tool-head{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;justify-content:space-between;padding:1rem 1.35rem;border-bottom:1px solid var(--line);background:var(--shell-2)}
.tool-head h3{font-size:1.02rem}
.tool-head p{font-size:.8rem;color:var(--ink-3);margin-top:.15rem}
.tool-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.85fr);gap:0}
.tool-inputs{padding:clamp(1.15rem,2.2vw,1.6rem);display:flex;flex-direction:column;gap:1.2rem}
.tool-output{padding:clamp(1.15rem,2.2vw,1.6rem);background:var(--deck);color:var(--on-deck);display:flex;flex-direction:column;gap:1rem}
.tool-output h4{color:#fff}

.field{display:flex;flex-direction:column;gap:.45rem}
.field > label,.field-legend{
  font-family:var(--mono);font-size:.655rem;font-weight:500;letter-spacing:.13em;
  text-transform:uppercase;color:var(--ink-3);display:flex;justify-content:space-between;gap:1rem;align-items:baseline;
}
.field-legend b{color:var(--stack);font-weight:600;letter-spacing:-.01em;font-size:.86rem;text-transform:none}
.field-hint{font-size:.775rem;color:var(--ink-3);line-height:1.45}
.field-err{font-size:.775rem;color:var(--neg);display:none}
.field.has-err .field-err{display:block}
.field.has-err input,.field.has-err select,.field.has-err textarea{border-color:var(--neg)}

input[type=text],input[type=email],input[type=tel],input[type=number],select,textarea{
  width:100%;padding:.68rem .8rem;background:var(--paper);
  border:1px solid var(--line-2);border-radius:var(--r);
  font-size:.9rem;transition:border-color .16s var(--ease),box-shadow .16s var(--ease);
}
input:hover,select:hover,textarea:hover{border-color:var(--ink-3)}
input:focus,select:focus,textarea:focus{outline:0;border-color:var(--stack);box-shadow:0 0 0 3px var(--stack-tint)}
textarea{resize:vertical;min-height:104px;line-height:1.55}
select{appearance:none;background-image:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='11' height='7' viewBox='0 0 11 7'%3E%3Cpath d='M1 1l4.5 4.5L10 1' stroke='%234B5D70' stroke-width='1.4' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .8rem center;padding-right:2.1rem}
input[type=range]{width:100%;-webkit-appearance:none;appearance:none;background:transparent;padding:0;border:0;height:22px;cursor:pointer}
input[type=range]::-webkit-slider-runnable-track{height:3px;background:var(--line-2);border-radius:2px}
input[type=range]::-moz-range-track{height:3px;background:var(--line-2);border-radius:2px}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:17px;height:17px;border-radius:50%;background:var(--stack);border:2px solid #fff;box-shadow:0 1px 4px rgba(11,22,34,.3);margin-top:-7px}
input[type=range]::-moz-range-thumb{width:15px;height:15px;border-radius:50%;background:var(--stack);border:2px solid #fff;box-shadow:0 1px 4px rgba(11,22,34,.3)}
input[type=range]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 3px var(--stack-tint)}

/* Segmented radio group */
.seg{display:flex;flex-wrap:wrap;gap:.4rem}
.seg input{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0}
.seg label{
  display:inline-flex;align-items:center;gap:.4rem;padding:.5rem .8rem;
  border:1px solid var(--line-2);border-radius:var(--r);background:var(--paper);
  font-size:.83rem;cursor:pointer;transition:all .16s var(--ease);
}
.seg label:hover{border-color:var(--ink-3)}
.seg input:checked + label{background:var(--stack);border-color:var(--stack);color:#fff;font-weight:500}
.seg input:focus-visible + label{outline:2px solid var(--signal);outline-offset:2px}
.seg--grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.seg--grid label{flex-direction:column;align-items:flex-start;gap:.25rem;padding:.75rem .9rem;text-align:left}
.seg--grid label small{font-size:.735rem;color:var(--ink-3);line-height:1.4;font-weight:400}
.seg--grid input:checked + label small{color:rgba(255,255,255,.78)}

.out-figure{font-family:var(--mono);font-size:clamp(1.9rem,4vw,2.7rem);font-weight:600;color:#6FE0A8;line-height:1;letter-spacing:-.035em}
.out-sub{font-size:.83rem;color:var(--on-deck-2);line-height:1.5}
.out-rows{display:flex;flex-direction:column;gap:0;margin-top:.25rem}
.out-row{display:flex;justify-content:space-between;gap:1rem;padding:.5rem 0;border-bottom:1px solid var(--line-deck);font-size:.83rem;color:var(--on-deck-2)}
.out-row:last-child{border-bottom:0}
.out-row b{font-family:var(--mono);font-weight:500;color:#fff;letter-spacing:-.01em}
.out-note{font-size:.735rem;color:var(--on-deck-3);line-height:1.5;border-top:1px solid var(--line-deck);padding-top:.75rem;margin-bottom:auto}

/* Recommendation panel */
.verdict{background:var(--stack-tint);border:1px solid var(--stack-line);border-radius:var(--r-lg);padding:1.35rem 1.5rem}
.verdict-k{font-family:var(--mono);font-size:.63rem;letter-spacing:.14em;text-transform:uppercase;color:var(--stack);margin-bottom:.5rem}
.verdict h3{color:var(--stack-deep);margin-bottom:.4rem}
.verdict p{font-size:.885rem;color:var(--ink-2);line-height:1.6;margin-bottom:1rem}

/* ── Multi-step form ───────────────────────────────────────────────────── */
.wizard{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.wizard-rail{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line);background:var(--shell-2)}
.wz-step{padding:.85rem 1rem;border-left:1px solid var(--line);position:relative;text-align:left}
.wz-step:first-child{border-left:0}
.wz-step::after{content:'';position:absolute;left:0;right:0;bottom:-1px;height:2px;background:transparent;transition:background .2s var(--ease)}
.wz-step[data-state="current"]::after{background:var(--signal)}
.wz-step[data-state="done"]::after{background:var(--pos)}
.wz-n{font-family:var(--mono);font-size:.62rem;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-3);display:block;margin-bottom:.2rem}
.wz-t{font-size:.83rem;font-weight:600;color:var(--ink-3);display:block;line-height:1.25}
.wz-step[data-state="current"] .wz-t{color:var(--ink)}
.wz-step[data-state="current"] .wz-n{color:var(--signal)}
.wz-step[data-state="done"] .wz-t{color:var(--ink-2)}
.wz-step[data-state="done"] .wz-n{color:var(--pos)}

.wizard-panel{padding:clamp(1.35rem,3vw,2.15rem);display:none}
.wizard-panel.is-active{display:block}
.wizard-panel > h3{margin-bottom:.4rem}
.wizard-panel > .field-hint{margin-bottom:1.6rem}
.field-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.15rem}
.field-grid .field--wide{grid-column:1/-1}
.wizard-foot{display:flex;flex-wrap:wrap;gap:.7rem;align-items:center;justify-content:space-between;padding:1.1rem clamp(1.35rem,3vw,2.15rem);border-top:1px solid var(--line);background:var(--shell-2)}
.wizard-foot .mono{font-size:.72rem;color:var(--ink-3);letter-spacing:.07em}

.review-list{display:flex;flex-direction:column;gap:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-bottom:1.5rem}
.review-list .datarow{padding:.62rem .95rem;background:var(--shell-2)}
.review-list .datarow:nth-child(even){background:var(--paper)}

.form-status{display:none;padding:1rem 1.15rem;border-radius:var(--r);font-size:.88rem;line-height:1.55;margin-bottom:1.25rem}
.form-status.is-on{display:block}
.form-status--err{background:var(--neg-tint);border:1px solid var(--neg-line);color:var(--neg)}
.form-status--ok{background:var(--pos-tint);border:1px solid var(--pos-line);color:var(--pos)}

.checkline{display:flex;gap:.65rem;align-items:flex-start;font-size:.83rem;color:var(--ink-2);line-height:1.5}
.checkline input[type=checkbox]{width:16px;height:16px;margin-top:2px;flex:none;accent-color:var(--stack)}
.checkline a{color:var(--stack);border-bottom:1px solid var(--stack-line)}

/* ── CTA band ──────────────────────────────────────────────────────────── */
.cta-band{background:var(--deck);color:var(--on-deck);position:relative;overflow:hidden}
.cta-band::before{
  content:'';position:absolute;inset:0;opacity:.55;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-mask-image:radial-gradient(100% 100% at 88% 50%,#000,transparent 70%);
  mask-image:radial-gradient(100% 100% at 88% 50%,#000,transparent 70%);
}
.cta-band .shell{position:relative;z-index:2}
.cta-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(1.75rem,4vw,3.5rem);align-items:center}
.cta-band h2{color:#fff;margin-bottom:.85rem;max-width:19ch}
.cta-band p{color:var(--on-deck-2);font-size:1rem;line-height:1.62;max-width:46ch}
.cta-acts{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.6rem}
.cta-facts{display:flex;flex-direction:column;gap:0;border:1px solid var(--line-deck);border-radius:var(--r-lg);overflow:hidden}
.cta-fact{display:flex;gap:.9rem;align-items:flex-start;padding:.95rem 1.15rem;border-bottom:1px solid var(--line-deck)}
.cta-fact:last-child{border-bottom:0}
.cta-fact-k{font-family:var(--mono);font-size:.7rem;color:#7FB6DC;letter-spacing:.06em;flex:none;width:4.2rem;padding-top:1px}
.cta-fact-v{font-size:.855rem;color:var(--on-deck-2);line-height:1.5}
.cta-fact-v b{color:#fff;font-weight:600}

/* ── Footer ────────────────────────────────────────────────────────────── */
.foot{background:var(--deck);color:var(--on-deck-2);border-top:1px solid var(--line-deck);padding-block:clamp(2.5rem,5vw,3.5rem) 1.5rem}
.foot-top{display:grid;grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));gap:clamp(1.5rem,3vw,2.5rem);padding-bottom:2.25rem;border-bottom:1px solid var(--line-deck)}
.foot-brand .wordmark-txt{color:#fff;font-size:1.22rem}
.foot-brand p{font-size:.855rem;line-height:1.6;color:var(--on-deck-3);margin-top:.9rem;max-width:34ch}
.foot h5,.foot h3,.foot h2{font-family:var(--mono);font-size:.63rem;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--on-deck-3);margin-bottom:.9rem;font-stretch:100%}
.foot-links{display:flex;flex-direction:column;gap:.55rem}
.foot-links a{font-size:.865rem;color:var(--on-deck-2);transition:color .16s var(--ease)}
.foot-links a:hover{color:#fff}
.foot-bot{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:baseline;padding-top:1.4rem}
.foot-bot p{font-size:.735rem;color:var(--on-deck-3);line-height:1.55;max-width:78ch}
.foot-bot a{color:var(--on-deck-2);border-bottom:1px solid var(--line-deck-2)}

/* ── Mobile action bar ─────────────────────────────────────────────────── */
.mobile-cta{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:70;
  background:rgba(255,255,255,.96);backdrop-filter:blur(12px);
  border-top:1px solid var(--line);padding:.65rem var(--gut);
  padding-bottom:calc(.65rem + env(safe-area-inset-bottom));
  gap:.55rem;
}
.mobile-cta .btn{flex:1}

/* ── Reveal ────────────────────────────────────────────────────────────── */
.rv{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.rv.in{opacity:1;transform:none}
html:not(.js-ready) .rv{opacity:1;transform:none}

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width:1080px){
  .nav a{padding:.5rem .5rem;font-size:.815rem}
  .wordmark-rule,.wordmark-sub{display:none}
}
@media (max-width:940px){
  .nav,.head-cta .btn--outline{display:none}
  .burger{display:flex;margin-left:.5rem}
  .head-cta{margin-left:auto}
  .split,.split--40,.split--form,.anatomy,.tool-body,.cta-grid{grid-template-columns:minmax(0,1fr)}
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .anatomy-fig{position:static}
  .foot-top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-brand{grid-column:1/-1}
  .titleblock-grid{grid-template-columns:repeat(2,1fr)}
  .tb-cell{border-left:0;border-top:1px solid var(--line-deck);padding-left:0}
  .tb-cell:nth-child(2){border-left:1px solid var(--line-deck);padding-left:1.2rem}
  .tb-cell:nth-child(4){border-left:1px solid var(--line-deck);padding-left:1.2rem}
  .tb-cell:nth-child(-n+2){border-top:0}
  .hero-media img{object-position:66% 40%}
  .hero-annotate{display:none}
  /* Narrow viewports lose the horizontal gradient's cover, so go vertical. */
  .hero-scrim{background:linear-gradient(to bottom,rgba(7,16,26,.93) 0%,rgba(7,16,26,.82) 42%,rgba(7,16,26,.9) 100%)}
}
@media (max-width:720px){
  body{font-size:16px}
  .grid-3,.grid-2,.grid-4,.field-grid{grid-template-columns:minmax(0,1fr)}
  .utility-facts span:not(:first-child){display:none}
  .mobile-cta{display:flex}
  .foot{padding-bottom:5.5rem}
  .wizard-rail{grid-template-columns:repeat(4,1fr)}
  .wz-step{padding:.7rem .5rem}
  .wz-t{display:none}
  .wz-n{font-size:.58rem;letter-spacing:.06em}
  .seq::before{left:29px}
  .seq-item{grid-template-columns:60px minmax(0,1fr)}
  .seq-clock{font-size:.72rem}
  .legend{gap:.5rem .9rem}
  .bar-seg{font-size:.55rem}
}
@media (max-width:480px){
  .hero-acts .btn,.cta-acts .btn{width:100%}
  .titleblock-grid{grid-template-columns:1fr}
  .tb-cell:nth-child(n){border-left:0;padding-left:0;border-top:1px solid var(--line-deck)}
  .tb-cell:first-child{border-top:0}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .rv{opacity:1;transform:none}
  .js-ready .anno .grp{opacity:1;animation:none}
}


/* ── FAQ disclosure ────────────────────────────────────────────────────── */
details.faq{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg)}
details.faq + details.faq{margin-top:.6rem}
details.faq[open]{border-color:var(--stack-line);box-shadow:0 0 0 1px var(--stack-line)}
details.faq summary{
  list-style:none;cursor:pointer;padding:1.05rem 1.35rem;
  display:flex;justify-content:space-between;gap:1.5rem;align-items:center;
  font-weight:600;font-size:.98rem;font-stretch:108%;letter-spacing:-.008em;
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:'+';font-family:var(--mono);font-size:1.15rem;color:var(--stack);flex:none;line-height:1}
details.faq[open] summary::after{content:'–'}
details.faq summary:hover{color:var(--stack)}
.faq-body{padding:0 1.35rem 1.3rem;font-size:.915rem;line-height:1.66;color:var(--ink-2);max-width:74ch}
.faq-body p + p{margin-top:.8rem}
.faq-body strong{color:var(--ink)}

/* ── Process steps ────────────────────────────────────────────────────── */
.process{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:var(--paper)}
.process-step{padding:1.25rem 1.2rem;border-left:1px solid var(--line)}
.process-step:first-child{border-left:0}
.process-k{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--stack);margin-bottom:.55rem;display:block}
.process-step h4{margin-bottom:.35rem}
.process-step p{font-size:.845rem;line-height:1.55;color:var(--ink-2)}
@media (max-width:940px){.process{grid-template-columns:repeat(2,minmax(0,1fr))}.process-step{border-left:0;border-top:1px solid var(--line)}.process-step:nth-child(odd){border-right:1px solid var(--line)}.process-step:nth-child(-n+2){border-top:0}}
@media (max-width:560px){.process{grid-template-columns:1fr}.process-step{border-right:0!important;border-top:1px solid var(--line)}.process-step:first-child{border-top:0}}

/* ── Print (datasheet) ─────────────────────────────────────────────────── */
@media print{
  .utility,.masthead,.mobile-cta,.mobile-nav,.cta-band,.foot-links,.no-print{display:none!important}
  body{background:#fff;font-size:10.5pt}
  .band{padding-block:0 1.2rem}
  .shell{max-width:none;padding-inline:0}
  .card,.table-wrap,.tool{break-inside:avoid;box-shadow:none}
  table.data{min-width:0}
  a[href^="http"]::after{content:" (" attr(href) ")";font-size:8pt;color:#555}
  .print-only{display:block!important}
}
.print-only{display:none}