:root{
  --paper:#F4F7FA;
  --raised:#FFFFFF;
  --ink:#152A41;
  --ink2:#48607A;
  --line:#C6D3DF;
  --grid:rgba(21,42,65,.055);
  --mark:#E8590C;
  --mark-deep:#BC4409;
  --ok:#1F7F4F;
  --bp:#12365F;
  --bp-line:rgba(214,232,248,.16);
  --bp-ink:#E4EFF9;
  --bp-ink2:#9DB8D2;
  --card-shadow:0 18px 40px -24px rgba(21,42,65,.35);
  --sans:"Avenir Next",Avenir,"Segoe UI Variable Display","Segoe UI",Frutiger,system-ui,"Helvetica Neue",Arial,sans-serif;
  --mono:"SF Mono",ui-monospace,SFMono-Regular,Menlo,"Cascadia Mono","Roboto Mono",Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root{
    --paper:#0C1723;
    --raised:#122232;
    --ink:#DCE8F4;
    --ink2:#8FA9C1;
    --line:#27405A;
    --grid:rgba(220,232,244,.05);
    --mark:#FF7A33;
    --mark-deep:#FF9257;
    --ok:#3BC583;
    --bp:#0D2036;
    --bp-line:rgba(214,232,248,.13);
    --card-shadow:0 18px 40px -24px rgba(0,0,0,.6);
  }
}
:root[data-theme="light"]{
  --paper:#F4F7FA;--raised:#FFFFFF;--ink:#152A41;--ink2:#48607A;--line:#C6D3DF;
  --grid:rgba(21,42,65,.055);--mark:#E8590C;--mark-deep:#BC4409;--ok:#1F7F4F;
  --bp:#12365F;--bp-line:rgba(214,232,248,.16);--card-shadow:0 18px 40px -24px rgba(21,42,65,.35);
}
:root[data-theme="dark"]{
  --paper:#0C1723;--raised:#122232;--ink:#DCE8F4;--ink2:#8FA9C1;--line:#27405A;
  --grid:rgba(220,232,244,.05);--mark:#FF7A33;--mark-deep:#FF9257;--ok:#3BC583;
  --bp:#0D2036;--bp-line:rgba(214,232,248,.13);--card-shadow:0 18px 40px -24px rgba(0,0,0,.6);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  background-image:
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:56px 56px;
}
::selection{background:var(--mark);color:#fff}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
:focus-visible{outline:2px solid var(--mark);outline-offset:3px}

.mono{font-family:var(--mono)}
.wrap{max-width:1180px;margin:0 auto;padding:0 clamp(1.1rem,4vw,2.5rem)}
section{position:relative}

/* ---------- progress tape ---------- */
#tape{position:fixed;top:0;left:0;height:3px;width:0;background:var(--mark);z-index:60}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:color-mix(in srgb,var(--paper) 86%,transparent);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-in{display:flex;align-items:center;gap:2rem;height:64px}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none}
.brand svg{display:block}
.brand-name{font-weight:800;letter-spacing:.02em;font-size:1.02rem}
.brand-tag{font-family:var(--mono);font-size:.6rem;letter-spacing:.16em;color:var(--ink2);text-transform:uppercase;display:block;margin-top:1px}
.nav-links{display:flex;gap:1.6rem;margin-left:auto}
.nav-links a{
  text-decoration:none;font-family:var(--mono);font-size:.72rem;letter-spacing:.13em;
  text-transform:uppercase;color:var(--ink2);padding:.35rem 0;border-bottom:2px solid transparent;
  transition:color .2s,border-color .2s;
}
.nav-links a:hover{color:var(--ink)}
.nav-links a.on{color:var(--ink);border-color:var(--mark)}
.nav-links a b{color:var(--mark);font-weight:600;margin-right:.35em}
.nav-links a.nav-cta{color:#fff;font-family:var(--sans);font-size:.85rem;letter-spacing:.01em;text-transform:none;padding:.55rem 1.05rem;border-bottom:none}
.nav-links a.nav-cta:hover{color:#fff}
.nav-toggle{display:none;padding:.45rem;color:var(--ink)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.55rem;
  padding:.85rem 1.5rem;border-radius:2px;text-decoration:none;
  font-weight:600;font-size:.95rem;letter-spacing:.01em;
  transition:transform .18s,box-shadow .18s,background .18s,color .18s;
}
.btn-primary{background:var(--mark);color:#fff;box-shadow:0 10px 24px -12px var(--mark)}
.btn-primary:hover{background:var(--mark-deep);transform:translateY(-2px)}
.btn-ghost{border:1.5px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-2px)}
.btn .arr{transition:transform .18s;font-family:var(--mono)}
.btn:hover .arr{transform:translateX(4px)}
.btn-sm{padding:.55rem 1.05rem;font-size:.85rem}

/* ---------- sheet headers ---------- */
.sheet{padding:clamp(4.2rem,9vw,7.5rem) 0}
.sheethead{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.4rem 1.4rem;
  border-top:2px solid var(--ink);padding-top:.85rem;margin-bottom:clamp(2.2rem,5vw,3.4rem);
}
.sh-no{font-family:var(--mono);font-size:.75rem;letter-spacing:.18em;color:var(--mark);font-weight:600}
.sh-title{font-size:clamp(1.7rem,3.4vw,2.5rem);font-weight:800;letter-spacing:-.015em;line-height:1.12;text-wrap:balance}
.sh-note{margin-left:auto;font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink2)}
.lede{max-width:56ch;color:var(--ink2);font-size:1.06rem;margin-top:-1.4rem;margin-bottom:2.6rem}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
[data-reveal].in{opacity:1;transform:none}
.stagger>*{opacity:0;transform:translateY(22px);transition:opacity .65s cubic-bezier(.2,.7,.2,1),transform .65s cubic-bezier(.2,.7,.2,1)}
.stagger.in>*{opacity:1;transform:none}
.stagger.in>*:nth-child(2){transition-delay:.09s}
.stagger.in>*:nth-child(3){transition-delay:.18s}
.stagger.in>*:nth-child(4){transition-delay:.27s}
.stagger.in>*:nth-child(5){transition-delay:.36s}
.stagger.in>*:nth-child(6){transition-delay:.45s}

/* ---------- hero ---------- */
.hero{padding:clamp(3.4rem,7vw,6rem) 0 clamp(3rem,6vw,4.5rem)}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:clamp(2rem,5vw,4.5rem);align-items:center}
.eyebrow{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--mark);font-weight:600;display:inline-flex;align-items:center;gap:.7rem;margin-bottom:1.5rem;
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--mark)}
h1{
  font-size:clamp(2.55rem,5.6vw,4.5rem);line-height:1.02;font-weight:800;
  letter-spacing:-.025em;text-wrap:balance;
}
h1 .flip{color:var(--mark)}
.hero-sub{color:var(--ink2);font-size:1.13rem;max-width:52ch;margin:1.6rem 0 2.1rem}
.hero-sub strong{color:var(--ink);font-weight:600}
.hero-ctas{display:flex;gap:.9rem;flex-wrap:wrap}
.hero-proof{
  margin-top:2.2rem;font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--ink2);display:flex;gap:1.5rem;flex-wrap:wrap;
}
.hero-proof span{display:inline-flex;align-items:center;gap:.5rem}
.hero-proof i{width:5px;height:5px;background:var(--mark);display:inline-block;transform:rotate(45deg)}

/* dimension line */
.dim{position:relative;margin:2rem 0 0;max-width:340px}
.dim-line{
  display:block;height:11px;transform-origin:left;transform:scaleX(0);
  transition:transform 1.1s cubic-bezier(.2,.7,.2,1) .3s;
  background:
    linear-gradient(var(--ink2),var(--ink2)) center/100% 1.5px no-repeat,
    linear-gradient(var(--ink2),var(--ink2)) left center/1.5px 100% no-repeat,
    linear-gradient(var(--ink2),var(--ink2)) right center/1.5px 100% no-repeat;
}
.in .dim-line,.dim.in .dim-line{transform:scaleX(1)}
.dim-label{
  font-family:var(--mono);font-size:.64rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink2);display:block;margin-top:.55rem;
}
.dim-label b{color:var(--mark);font-weight:600}

/* night shift log card */
.log{
  background:var(--bp);border:1px solid var(--bp-line);border-radius:4px;
  box-shadow:var(--card-shadow);overflow:hidden;position:relative;
  background-image:
    linear-gradient(var(--bp-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--bp-line) 1px,transparent 1px);
  background-size:28px 28px;
}
.log-head{
  display:flex;align-items:center;gap:.65rem;padding:.9rem 1.2rem;
  border-bottom:1px solid var(--bp-line);
  font-family:var(--mono);font-size:.68rem;letter-spacing:.18em;color:var(--bp-ink2);text-transform:uppercase;
}
.log-dot{width:8px;height:8px;border-radius:50%;background:#3BC583;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(59,197,131,.5)}50%{box-shadow:0 0 0 7px rgba(59,197,131,0)}}
.log-head .lh-r{margin-left:auto;color:var(--bp-ink2)}
.log-body{padding:1.25rem 1.3rem 1.5rem;min-height:238px;font-family:var(--mono);font-size:.82rem;line-height:1.9;color:var(--bp-ink)}
.log-body .lt{color:var(--bp-ink2);letter-spacing:.08em}
.log-body .lg{color:#4ADE94;font-weight:600}
.log-body .lo{color:#FFA96B}
.log-body div{white-space:pre-wrap;word-break:break-word}
.cursor{display:inline-block;width:8px;height:15px;background:var(--mark);vertical-align:-2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.log-foot{
  border-top:1px solid var(--bp-line);padding:.7rem 1.2rem;display:flex;gap:1rem;
  font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--bp-ink2);
}

/* ---------- ticker ---------- */
.ticker{border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;background:var(--raised)}
.ticker-track{display:flex;width:max-content;animation:tick 46s linear infinite;padding:.85rem 0}
.ticker:hover .ticker-track{animation-play-state:paused}
.ticker-track span{
  font-family:var(--mono);font-size:.7rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--ink2);padding:0 1.6rem;display:inline-flex;align-items:center;gap:1.6rem;white-space:nowrap;
}
.ticker-track span::after{content:"";width:6px;height:6px;background:var(--mark);transform:rotate(45deg);flex:none}
@keyframes tick{to{transform:translateX(-50%)}}

/* ---------- leak / calculator ---------- */
.leak-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:clamp(2rem,5vw,4rem);align-items:start}
.leak-copy p{color:var(--ink2);margin-bottom:1.1rem;max-width:52ch}
.leak-copy p strong{color:var(--ink);font-weight:600}
.leak-fact{
  border-left:2px solid var(--mark);padding:.35rem 0 .35rem 1.1rem;margin:1.8rem 0;
}
.leak-fact .lf-big{font-size:1.35rem;font-weight:700;letter-spacing:-.01em;line-height:1.3;text-wrap:balance}
.leak-fact .lf-src{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--ink2);display:block;margin-top:.5rem}
.calc{
  background:var(--raised);border:1px solid var(--line);border-radius:4px;
  box-shadow:var(--card-shadow);padding:clamp(1.4rem,3vw,2.2rem);position:relative;
}
.calc::before,.calc::after,
.card::before,.card::after{
  content:"";position:absolute;width:12px;height:12px;pointer-events:none;
  transition:border-color .25s;
}
.calc::before{top:-1px;left:-1px;border-top:2px solid var(--ink);border-left:2px solid var(--ink)}
.calc::after{bottom:-1px;right:-1px;border-bottom:2px solid var(--ink);border-right:2px solid var(--ink)}
.calc-title{font-family:var(--mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:var(--ink2);margin-bottom:1.6rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.calc-title b{color:var(--mark);font-weight:600}
.ctrl{margin-bottom:1.5rem}
.ctrl-row{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:.55rem}
.ctrl-row label{font-weight:600;font-size:.95rem}
.ctrl-row output{font-family:var(--mono);font-size:.95rem;font-weight:600;color:var(--mark);font-variant-numeric:tabular-nums}
input[type=range]{
  -webkit-appearance:none;appearance:none;width:100%;height:26px;background:transparent;cursor:pointer;
}
input[type=range]::-webkit-slider-runnable-track{
  height:10px;
  background:
    linear-gradient(var(--line),var(--line)) center/100% 1.5px no-repeat,
    repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 10%) center/100% 7px no-repeat;
}
input[type=range]::-moz-range-track{
  height:10px;
  background:linear-gradient(var(--line),var(--line)) center/100% 1.5px no-repeat;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;background:var(--mark);
  border:2.5px solid var(--paper);box-shadow:0 0 0 1.5px var(--mark);margin-top:-4px;
  transition:transform .15s;
}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.15)}
input[type=range]::-moz-range-thumb{
  width:14px;height:14px;border-radius:0;background:var(--mark);
  border:2.5px solid var(--paper);box-shadow:0 0 0 1.5px var(--mark);
}
.calc-eq{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:var(--ink2);
  border-top:1px dashed var(--line);padding-top:1.2rem;margin-top:.4rem;
  font-variant-numeric:tabular-nums;overflow-x:auto;white-space:nowrap;
}
.calc-out{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem;margin-top:1.3rem}
.co-cell .co-label{font-family:var(--mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink2);display:block;margin-bottom:.3rem}
.co-cell .co-val{font-size:clamp(1.6rem,3.2vw,2.3rem);font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums;line-height:1.1}
.co-leak .co-val{color:var(--mark)}
.co-rec .co-val{color:var(--ok)}
.co-cell .co-sub{font-size:.78rem;color:var(--ink2);display:block;margin-top:.25rem}

/* ---------- systems ---------- */
.sys-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.card{
  position:relative;background:var(--raised);border:1px solid var(--line);border-radius:4px;
  padding:1.7rem 1.5rem 1.6rem;display:flex;flex-direction:column;gap:.8rem;
  transition:transform .25s cubic-bezier(.2,.7,.2,1),box-shadow .25s,border-color .25s;
}
.card::before{top:-1px;left:-1px;border-top:2px solid var(--line);border-left:2px solid var(--line)}
.card::after{bottom:-1px;right:-1px;border-bottom:2px solid var(--line);border-right:2px solid var(--line)}
.card:hover{transform:translateY(-5px);box-shadow:var(--card-shadow);border-color:color-mix(in srgb,var(--mark) 45%,var(--line))}
.card:hover::before,.card:hover::after{border-color:var(--mark)}
.card-no{font-family:var(--mono);font-size:.66rem;letter-spacing:.2em;color:var(--mark);font-weight:600}
.card h3{font-size:1.22rem;font-weight:700;letter-spacing:-.01em;line-height:1.25}
.card .card-out{color:var(--ink2);font-size:.92rem}
.card ul{list-style:none;margin-top:.2rem;display:flex;flex-direction:column;gap:.45rem}
.card li{
  font-size:.85rem;color:var(--ink2);padding-left:1.1rem;position:relative;
}
.card li::before{content:"";position:absolute;left:0;top:.52em;width:6px;height:6px;background:var(--mark);transform:rotate(45deg)}

/* ---------- method (blueprint band) ---------- */
.bp{
  background:var(--bp);color:var(--bp-ink);
  background-image:
    linear-gradient(var(--bp-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--bp-line) 1px,transparent 1px);
  background-size:56px 56px;
}
.bp .sheethead{border-top-color:var(--bp-ink)}
.bp .sh-note,.bp .lede{color:var(--bp-ink2)}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;counter-reset:step}
.step{
  border:1px solid var(--bp-line);border-radius:4px;padding:1.6rem 1.4rem;
  background:rgba(255,255,255,.03);position:relative;
}
.step-no{
  font-family:var(--mono);font-size:2.6rem;font-weight:700;line-height:1;
  color:transparent;-webkit-text-stroke:1.2px var(--bp-ink2);display:block;margin-bottom:1rem;
}
.step h3{font-size:1.12rem;font-weight:700;margin-bottom:.5rem}
.step .step-when{font-family:var(--mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--mark);display:block;margin-bottom:.7rem}
.step p{font-size:.88rem;color:var(--bp-ink2)}
.bp-note{
  margin-top:2.6rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;
  color:var(--bp-ink2);display:flex;align-items:center;gap:.8rem;flex-wrap:wrap;
}
.bp-note b{color:var(--bp-ink);font-weight:600}
.bp-note::before{content:"";width:26px;height:2px;background:var(--mark);flex:none}

/* ---------- spec ---------- */
.dims{display:grid;grid-template-columns:repeat(3,1fr);gap:2.4rem;margin-bottom:clamp(3rem,6vw,4.5rem)}
.dimstat .dim{margin:0 0 .9rem;max-width:none}
.dimstat .ds-val{font-size:clamp(2rem,4.4vw,3.1rem);font-weight:800;letter-spacing:-.025em;font-variant-numeric:tabular-nums;line-height:1.05}
.dimstat .ds-val i{font-style:normal;color:var(--mark)}
.dimstat .ds-label{color:var(--ink2);font-size:.92rem;margin-top:.35rem;display:block;max-width:30ch}
.spec-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(2rem,4vw,3.5rem);align-items:start}
.chip-title{font-family:var(--mono);font-size:.68rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink2);margin-bottom:1.1rem}
.chips{display:flex;flex-wrap:wrap;gap:.55rem}
.chip{
  font-family:var(--mono);font-size:.74rem;letter-spacing:.05em;
  border:1px solid var(--line);padding:.45rem .8rem;border-radius:2px;background:var(--raised);
  transition:border-color .2s,transform .2s;
}
.chip:hover{border-color:var(--mark);transform:translateY(-2px)}
.spec-note{color:var(--ink2);font-size:.9rem;margin-top:1.4rem;max-width:48ch}
.pledge{
  border:1.5px solid var(--ink);border-radius:4px;padding:1.8rem 1.7rem;background:var(--raised);
  position:relative;box-shadow:var(--card-shadow);
}
.pledge-no{font-family:var(--mono);font-size:.64rem;letter-spacing:.2em;color:var(--mark);font-weight:600;text-transform:uppercase}
.pledge h3{font-size:1.45rem;font-weight:800;letter-spacing:-.015em;margin:.6rem 0 .8rem;line-height:1.2;text-wrap:balance}
.pledge p{color:var(--ink2);font-size:.94rem;margin-bottom:.9rem}
.pledge p:last-child{margin-bottom:0}
.pledge p strong{color:var(--ink);font-weight:600}

/* ---------- RFI ---------- */
.rfi-list{max-width:820px}
.rfi{border-bottom:1px solid var(--line)}
.rfi:first-child{border-top:1px solid var(--line)}
.rfi-q{
  width:100%;display:flex;align-items:baseline;gap:1.1rem;text-align:left;
  padding:1.35rem .2rem;font-size:1.08rem;font-weight:600;letter-spacing:-.005em;
  transition:color .2s;
}
.rfi-q:hover{color:var(--mark)}
.rfi-q .rfi-no{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;color:var(--mark);flex:none;font-weight:600}
.rfi-q .rfi-x{
  margin-left:auto;flex:none;font-family:var(--mono);font-size:1.1rem;color:var(--ink2);
  transition:transform .3s cubic-bezier(.2,.7,.2,1);
}
.rfi.open .rfi-x{transform:rotate(45deg);color:var(--mark)}
.rfi-a{max-height:0;overflow:hidden;transition:max-height .45s cubic-bezier(.2,.7,.2,1)}
.rfi-a p{color:var(--ink2);padding:0 .2rem 1.5rem;padding-left:calc(1.1rem + 2.6ch);max-width:68ch;font-size:.97rem}
.rfi-a p strong{color:var(--ink);font-weight:600}

/* ---------- mobilize ---------- */
.mob{padding:clamp(4.5rem,10vw,8rem) 0}
.mob-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.mob h2{font-size:clamp(2.2rem,4.8vw,3.6rem);font-weight:800;letter-spacing:-.025em;line-height:1.06;text-wrap:balance;margin-bottom:1.4rem}
.mob h2 em{font-style:normal;color:var(--mark)}
.mob p{color:var(--ink2);font-size:1.08rem;max-width:50ch;margin-bottom:2rem}
.mob p strong{color:var(--ink);font-weight:600}
.mob-alt{margin-top:1.6rem;font-size:.9rem;color:var(--ink2)}
.mob-alt a{color:var(--mark);font-weight:600;text-decoration:none;border-bottom:1.5px solid transparent;transition:border-color .2s}
.mob-alt a:hover{border-color:var(--mark)}
.stamp-zone{display:flex;justify-content:center}
.stamp{
  width:min(240px,60vw);aspect-ratio:1;border:3px double var(--mark);border-radius:50%;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.4rem;
  color:var(--mark);transform:rotate(-8deg);text-align:center;padding:1.4rem;
  font-family:var(--mono);letter-spacing:.2em;text-transform:uppercase;
  opacity:0;transition:opacity .4s,transform .5s cubic-bezier(.34,1.4,.4,1);
}
.stamp.in{opacity:.92;transform:rotate(-8deg) scale(1)}
[data-reveal].stamp{transform:rotate(-8deg) scale(1.5)}
.stamp .st-a{font-size:.62rem}
.stamp .st-b{font-size:1.05rem;font-weight:700;letter-spacing:.26em;border-top:1.5px solid var(--mark);border-bottom:1.5px solid var(--mark);padding:.45rem .2rem;width:100%}
.stamp .st-c{font-size:.58rem;letter-spacing:.16em}

/* ---------- footer ---------- */
footer{border-top:2px solid var(--ink);background:var(--raised)}
.tb{
  display:grid;grid-template-columns:repeat(6,1fr);
  border-left:1px solid var(--line);border-right:1px solid var(--line);
}
.tb-cell{border-right:1px solid var(--line);padding:1.1rem 1.2rem;min-width:0}
.tb-cell:last-child{border-right:none}
.tb-k{font-family:var(--mono);font-size:.56rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink2);display:block;margin-bottom:.35rem}
.tb-v{font-size:.86rem;font-weight:600;overflow-wrap:break-word}
.tb-v a{text-decoration:none;color:var(--mark)}
.tb-v a:hover{text-decoration:underline}
.foot-base{
  display:flex;justify-content:space-between;gap:1rem 2rem;flex-wrap:wrap;align-items:center;
  padding:1.1rem 0 1.4rem;font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink2);
}
.foot-links{display:flex;gap:1.4rem;flex-wrap:wrap}
.foot-links a{text-decoration:none;color:var(--ink2);transition:color .2s}
.foot-links a:hover{color:var(--mark)}

/* ---------- subpages ---------- */
.page-hero .sheethead{margin-bottom:clamp(1.6rem,4vw,2.6rem)}
.prose{max-width:76ch}
.prose>*+*{margin-top:1rem}
.prose h2{font-size:1.4rem;font-weight:800;letter-spacing:-.01em;margin-top:2.4rem;padding-top:1.4rem;border-top:1px solid var(--line)}
.prose h3{font-size:1.12rem;font-weight:700;margin-top:1.8rem}
.prose p,.prose li{color:var(--ink2);font-size:.98rem}
.prose strong{color:var(--ink);font-weight:600}
.prose a{color:var(--mark);font-weight:600;text-decoration:none;border-bottom:1.5px solid transparent;transition:border-color .2s}
.prose a:hover{border-color:var(--mark)}
.prose a.btn{border-bottom:none}
.prose a.btn-primary,.prose a.btn-primary:hover{color:#fff}
.prose ul,.prose ol{padding-left:1.3rem;display:flex;flex-direction:column;gap:.45rem}
.prose blockquote{border-left:2px solid var(--mark);padding:.4rem 0 .4rem 1.1rem;font-size:1.15rem;font-weight:600;color:var(--ink);letter-spacing:-.005em}
.prose code{font-family:var(--mono);font-size:.85em;background:var(--raised);border:1px solid var(--line);padding:.1em .35em;border-radius:2px}
.prose pre{background:var(--bp);color:var(--bp-ink);padding:1.1rem 1.2rem;border-radius:4px;overflow-x:auto}
.prose pre code{background:none;border:none;padding:0;color:inherit;font-size:.82rem}
.prose hr{border:none;border-top:1px dashed var(--line);margin:2rem 0}
.prose img{max-width:100%;border:1px solid var(--line);border-radius:4px}

/* ---------- blog ---------- */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.post-card h3 a{text-decoration:none;transition:color .2s}
.post-card h3 a:hover{color:var(--mark)}
.post-card .post-read{margin-top:auto;padding-top:.6rem;font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--mark);font-weight:600}
.post-meta{display:flex;gap:.55rem;flex-wrap:wrap;margin-bottom:1.4rem}
.post-status{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;color:var(--ink2);padding:2.5rem 0}
.post-nav{margin-top:2.6rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.13em;text-transform:uppercase}
.post-nav a{color:var(--ink2);text-decoration:none;transition:color .2s}
.post-nav a:hover{color:var(--mark)}
.post-foot-cta{margin-top:3rem;max-width:76ch}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .hero-grid,.leak-grid,.spec-grid,.mob-grid{grid-template-columns:1fr}
  .sys-grid,.post-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .dims{grid-template-columns:1fr 1fr}
  .tb{grid-template-columns:repeat(3,1fr)}
  .tb-cell:nth-child(3n){border-right:none}
  .tb-cell{border-bottom:1px solid var(--line)}
  .stamp-zone{justify-content:flex-start}
}
@media (max-width:640px){
  .nav-in{gap:1rem}
  .brand-tag{display:none}
  .brand-name{white-space:nowrap}
  .nav-links a.nav-cta{white-space:nowrap;padding:.5rem .8rem;font-size:.8rem}
  .nav-links a:not(.nav-cta){display:none}
  .nav-toggle{display:inline-flex}
  .nav.nav-open .nav-toggle{margin-left:auto}
  .nav.nav-open .nav-links{
    position:absolute;top:64px;left:0;right:0;display:flex;flex-direction:column;gap:0;
    background:var(--paper);border-bottom:1px solid var(--line);
    padding:.4rem clamp(1.1rem,4vw,2.5rem) 1.2rem;box-shadow:var(--card-shadow);
  }
  .nav.nav-open .nav-links a{display:block;padding:.85rem 0;border-bottom:1px solid var(--line)}
  .nav.nav-open .nav-links a.nav-cta{display:inline-flex;justify-content:center;border-bottom:none;margin-top:.9rem}
  .sys-grid,.steps,.dims,.calc-out,.post-grid{grid-template-columns:1fr}
  .tb{grid-template-columns:1fr 1fr}
  .tb-cell:nth-child(3n){border-right:1px solid var(--line)}
  .tb-cell:nth-child(2n){border-right:none}
  .sh-note{display:none}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important;animation-iteration-count:1!important}
  [data-reveal],.stagger>*{opacity:1;transform:none}
  .dim-line{transform:scaleX(1)}
  .ticker-track{animation:none;flex-wrap:wrap;width:auto}
  .stamp{opacity:.92;transform:rotate(-8deg)}
}