/* ============================================================================
   DATUM — The Precision Instrument
   ACE International Consulting Engineers · v3
   100% self-hosted. No external requests. No CDN. No remote fonts or images.
   ========================================================================= */

/* ---------- self-hosted typefaces ---------- */
@import url("fonts/google/oswald.css");
@import url("fonts/google/inter-tight.css");
@import url("fonts/google/ibm-plex-mono.css");

/* ============================== TOKENS ================================== */
:root{
  /* surfaces */
  --ink-0:#020F2B;        /* Abyss Navy   — primary dark surface        */
  --ink-1:#001E4C;        /* Charter Navy — brand navy, raised panels   */
  --vellum:#FFFFFF;       /* White sheet — primary light surface        */
  --vellum-2:#F3F4F6;     /* Sheet Edge   — cards, title-block cells    */

  /* brand + instrument */
  --teal-500:#267F85;     /* ACE Teal     — buttons, active fills       */
  --teal-300:#3FC1CB;     /* Optic Teal   — live readouts on dark only  */
  --datum-red:#C8401F;    /* Benchmark Red — RATIONED, max ~1% viewport */
  --cyanotype:#0A2A52;    /* blueprint duotone shadow                   */

  /* lines + secondary text */
  --line-dark:#8FA0BF;    /* hairlines/mono on dark                     */
  --line-light:#9AA1AA;   /* hairlines on white (neutral, not warm)     */
  --ink-mute:#555D68;     /* body-secondary on white                    */

  /* alpha rules — hairlines are the whole design, keep them exact */
  --rule-dark:rgba(143,160,191,.24);
  --rule-dark-2:rgba(143,160,191,.42);
  --rule-light:rgba(154,161,170,.34);
  --rule-light-2:rgba(154,161,170,.62);

  /* type families
     display : Oswald — heavy condensed industrial grotesque, chosen to match
               the ACE logo lettering (squared terminals, tight condensed caps,
               engineering-signage weight). Nameplate + section H2s.
     sans    : Inter Tight — refined neutral. Body copy, H3s, UI.
     mono    : IBM Plex Mono — the instrument voice: every readout and label. */
  --ff-display:"Oswald","Arial Narrow",Impact,sans-serif;
  --ff-body:"Inter Tight",system-ui,-apple-system,Segoe UI,sans-serif;
  --ff-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,monospace;

  /* type scale — a condensed face fits far more per line, so the nameplate
     can run larger than the serif did without breaking the grid. */
  --fs-nameplate:clamp(2.5rem,.9rem + 5.4vw,6.2rem);
  --fs-h2:clamp(2rem,1.35rem + 2.8vw,4.25rem);
  --fs-h3:clamp(1.375rem,1.2rem + .9vw,2rem);
  --fs-body:clamp(1rem,.96rem + .2vw,1.125rem);
  --fs-data:clamp(.6875rem,.66rem + .15vw,.8125rem);
  --fs-micro:.625rem;

  --lh-nameplate:.98; --lh-display:1.1; --lh-body:1.65; --lh-data:1.5;

  /* grid */
  --maxw:1440px;
  --margin:clamp(20px,4vw,96px);
  --gutter:clamp(16px,1.5vw,24px);
  --rail:56px;                      /* chainage rail width (desktop)    */

  /* button pair — kept explicit so neither theme can break its contrast */
  --btn-bg:var(--teal-500);
  --btn-fg:#ffffff;
  --btn-bg-hover:var(--teal-300);
  --btn-fg-hover:var(--ink-0);

  /* ambient backlight — large soft ellipses, the instrument's glow.
     Same technique as remarketly.io: oversized radial, accent, transparent. */
  --glow-1:rgba(63,193,203,.13);
  --glow-2:rgba(38,127,133,.10);
  --glow-3:rgba(200,64,31,.05);

  /* motion */
  --e-reveal:cubic-bezier(.16,1,.3,1);      /* expo.out    */
  --e-machine:cubic-bezier(.65,0,.35,1);    /* power2.inOut*/
  --d-micro:.22s; --d-std:.6s; --d-major:1s;

  color-scheme:dark;
}

/* ==========================================================================
   LIGHT THEME
   Light the whole way down — white, not an inversion. The band rhythm is kept
   by tinting (white against a faint cool grey) rather than by flipping to
   navy, so the hairline + mono layer does the structural work instead.
   ========================================================================== */
[data-theme="light"]{
  color-scheme:light;

  --ink-0:#FFFFFF;        /* primary band → white                          */
  --vellum:#0E1B2E;       /* TEXT on white. This token also names the alt
                             band, so the band rules are overridden below. */
  --ink-1:#0E1B2E;        /* text on the tinted band                       */
  --vellum-2:#FFFFFF;     /* raised cells                                  */

  --line-dark:#5A6470;    /* mono + hairlines on white                     */
  --line-light:#8A929E;   /* hairlines on the tinted band                  */
  --ink-mute:#5A6470;     /* secondary text                                */

  --rule-dark:rgba(90,100,112,.26);
  --rule-dark-2:rgba(90,100,112,.46);
  --rule-light:rgba(90,100,112,.22);
  --rule-light-2:rgba(90,100,112,.40);

  --teal-300:#1B6E75;     /* accent — darkened to hold AA on white         */
  --teal-500:#1B6E75;
  --datum-red:#A8331A;

  --btn-bg:#1B6E75;
  --btn-fg:#ffffff;
  --btn-bg-hover:#0E1B2E;
  --btn-fg-hover:#FFFFFF;

  --glow-1:rgba(27,110,117,.09);
  --glow-2:rgba(38,127,133,.06);
  --glow-3:rgba(168,51,26,.035);
}
[data-theme="light"] body{background:#FFFFFF;color:#0E1B2E}
[data-theme="light"] .on-ink,
[data-theme="light"] .hero{background-color:#FFFFFF;color:#0E1B2E}
[data-theme="light"] .on-vellum{background:#F6F7F9;color:#0E1B2E}
[data-theme="light"] .on-charter{background:#EDF0F4;color:#0E1B2E}
[data-theme="light"] .strip{background:#FFFFFF}
[data-theme="light"] .strip li b{color:#0E1B2E}
[data-theme="light"] .hero-figure .plate img{filter:none}
[data-theme="light"] .hero-hud{background:rgba(255,255,255,.92)}
[data-theme="light"] .hero-hud div{color:#5A6470}
[data-theme="light"] .titleblock .v,
[data-theme="light"] .station .yr,
[data-theme="light"] .odo{color:#0E1B2E}
[data-theme="light"] .foot-mark text{stroke:#0E1B2E;opacity:.45}
[data-theme="light"] .stamp text,
[data-theme="light"] .stamp .mark{fill:#0E1B2E}
[data-theme="light"] .stamp circle{stroke:rgba(14,27,46,.3)}
[data-theme="light"] .chainage{
  background:linear-gradient(to left,rgba(0,0,0,.03),transparent);
  border-left-color:rgba(90,100,112,.26);
}
[data-theme="light"] .nav.is-stuck{
  background:rgba(255,255,255,.9);border-bottom-color:rgba(90,100,112,.26);
}
[data-theme="light"] .sheet{background:#FFFFFF}
[data-theme="light"] .theatre-map .land{stroke:rgba(90,100,112,.45)}
[data-theme="light"] .bm text{fill:#5A6470}

/* ============================== RESET =================================== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0}
img,svg,canvas{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,figure,ul{margin:0}
ul{list-style:none;padding:0}
a{color:inherit;text-decoration:none}

html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  background:var(--ink-0);
  color:var(--vellum);
  font-family:var(--ff-body);
  font-size:var(--fs-body);
  line-height:var(--lh-body);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

::selection{background:var(--teal-300);color:var(--ink-0)}

/* focus — visible, instrument-like, never removed */
:focus-visible{
  outline:2px solid var(--teal-300);
  outline-offset:3px;
}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;top:-100%;left:var(--margin);z-index:999;
  background:var(--teal-300);color:var(--ink-0);
  padding:12px 20px;font-family:var(--ff-mono);font-size:var(--fs-data);
  text-transform:uppercase;letter-spacing:.1em;
}
.skip-link:focus{top:12px}

/* ============================== PRIMITIVES ============================== */
.grid{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding-inline:var(--margin);
  display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gutter);
}
.section{position:relative;padding-block:clamp(72px,10vw,160px)}
.on-vellum{background:var(--vellum);color:var(--ink-1)}
.on-ink{background:var(--ink-0);color:var(--vellum)}
.on-charter{background:var(--ink-1);color:var(--vellum)}

/* ---- ambient backlight -------------------------------------------------
   Oversized soft radials layered over the primary surface. Painted on a
   single fixed pseudo-element so it costs one composited layer for the whole
   page rather than one per section, and never repaints on scroll.        */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(1100px 520px at 50% -8%,  var(--glow-1), transparent 62%),
    radial-gradient(760px 420px at 8% 22%,    var(--glow-2), transparent 68%),
    radial-gradient(620px 380px at 96% 68%,   var(--glow-2), transparent 66%),
    radial-gradient(420px 300px at 78% 8%,    var(--glow-3), transparent 70%);
  transition:background .4s ease;
}
/* every band paints above the glow; the dark bands let it through */
.section,.strip,.sheets-viewport,.hero,footer{position:relative;z-index:1}
.on-ink,.hero{background-color:color-mix(in srgb,var(--ink-0) 88%,transparent)}
.on-vellum,.on-charter{isolation:isolate}

/* mono data label — the voice of the instrument */
.mono{
  font-family:var(--ff-mono);font-size:var(--fs-data);font-weight:400;
  text-transform:uppercase;letter-spacing:.1em;line-height:var(--lh-data);
  font-variant-numeric:tabular-nums;
}
.mono-micro{font-size:var(--fs-micro);letter-spacing:.12em}
.num{font-variant-numeric:tabular-nums}

/* section eyebrow: index + rule + label */
.eyebrow{display:flex;align-items:center;gap:14px;margin-bottom:clamp(24px,3vw,48px)}
.eyebrow::after{content:"";flex:1;height:1px;background:var(--rule-dark)}
.on-vellum .eyebrow::after{background:var(--rule-light)}
.eyebrow .idx{color:var(--datum-red)}
.on-vellum .eyebrow .label{color:var(--ink-mute)}
.eyebrow .label{color:var(--line-dark)}

/* headings
   H2 = the elegant register (serif, single weight, opened line-height).
   H3 = the working register (Inter Tight 600) — holds up at small sizes and
        on dark navy where the serif's thin strokes would go weak. */
.h2{
  font-family:var(--ff-display);font-weight:600;
  font-size:var(--fs-h2);line-height:1.08;letter-spacing:.004em;
  max-width:22ch;
}
.h3{
  font-family:var(--ff-body);font-weight:600;
  font-size:var(--fs-h3);line-height:1.18;letter-spacing:-.015em;
}
/* Accent phrase. Oswald ships no italic and a synthesised oblique on a heavy
   condensed face looks broken — so emphasis is carried by colour + weight,
   which is also more at home in a drawing than italics are. */
.it{color:var(--teal-300);font-weight:500}
.on-vellum .it{color:var(--teal-500)}
.lede{
  font-size:var(--fs-body);line-height:var(--lh-body);max-width:62ch;
  color:color-mix(in srgb,currentColor 78%,transparent);
}

/* dimension underline — hairline + perpendicular end ticks + measured value */
.dim{position:relative;white-space:nowrap}
.dim::after{
  content:"";position:absolute;left:0;right:0;bottom:-.18em;height:7px;
  border-bottom:1px solid var(--datum-red);
  border-left:1px solid var(--datum-red);
  border-right:1px solid var(--datum-red);
  opacity:.9;
}
.dim[data-value]::before{
  content:attr(data-value);
  position:absolute;left:50%;transform:translate(-50%,0);bottom:-1.45em;
  font-family:var(--ff-mono);font-size:var(--fs-micro);letter-spacing:.12em;
  color:var(--datum-red);background:inherit;padding:0 6px;
}

/* hairline frame with corner registration marks */
.frame{position:relative;border:1px solid var(--rule-dark)}
.on-vellum .frame{border-color:var(--rule-light)}
.frame::before,.frame::after{
  content:"";position:absolute;width:12px;height:12px;pointer-events:none;
  border-color:var(--teal-300);
}
.on-vellum .frame::before,.on-vellum .frame::after{border-color:var(--teal-500)}
.frame::before{top:-1px;left:-1px;border-top:1px solid;border-left:1px solid}
.frame::after{bottom:-1px;right:-1px;border-bottom:1px solid;border-right:1px solid}

/* buttons — toolbar controls, never rounded */
.btn{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--ff-mono);font-size:var(--fs-data);font-weight:500;
  text-transform:uppercase;letter-spacing:.1em;
  padding:15px 26px;border:1px solid transparent;cursor:pointer;
  transition:background var(--d-micro) ease,color var(--d-micro) ease,
             border-color var(--d-micro) ease;
}
.btn-fill{background:var(--btn-bg);color:var(--btn-fg)}
.btn-fill:hover,.btn-fill:focus-visible{background:var(--btn-bg-hover);color:var(--btn-fg-hover)}
.btn-ghost{border-color:var(--rule-dark-2);color:currentColor;position:relative}
.btn-ghost:hover,.btn-ghost:focus-visible{border-color:var(--teal-300);color:var(--teal-300)}
.on-vellum .btn-ghost{border-color:var(--rule-light-2)}
.on-vellum .btn-ghost:hover{border-color:var(--teal-500);color:var(--teal-500)}
.btn .arw{transition:transform var(--d-micro) var(--e-machine)}
.btn:hover .arw{transform:translateX(4px)}

/* image plate: LQIP background + fade-in, prevents layout shift */
.plate{position:relative;overflow:hidden;background:var(--cyanotype)}
.plate img{
  width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity .5s ease;
}
.plate img.is-loaded{opacity:1}
.plate .lqip{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  filter:blur(12px);transform:scale(1.06);opacity:1;
  transition:opacity .5s ease;
}
.plate.is-ready .lqip{opacity:0}

/* ============================== 01 · NAV ================================ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;height:64px;
  display:flex;align-items:center;
  transition:background .3s ease,border-color .3s ease;
  border-bottom:1px solid transparent;
}
.nav.is-stuck{
  background:color-mix(in srgb,var(--ink-0) 88%,transparent);
  backdrop-filter:blur(10px);
  border-bottom-color:var(--rule-dark);
}
.nav .grid{align-items:center}
.nav-logo{grid-column:1/span 3;display:flex;align-items:center}
.nav-logo img{height:34px;width:auto}
.nav-list{grid-column:5/span 6;display:flex;gap:clamp(14px,2vw,30px);justify-content:center}
.nav-list a{display:flex;align-items:baseline;gap:6px;position:relative;padding:6px 0}
.nav-list .i{color:var(--line-dark);font-size:var(--fs-micro);transition:color var(--d-micro)}
.nav-list a:hover .i,.nav-list a:focus-visible .i{color:var(--teal-300)}
.nav-list a::before{
  content:"";position:absolute;left:-10px;top:50%;width:0;height:1px;
  background:var(--teal-300);transition:width var(--d-micro) var(--e-machine);
}
.nav-list a:hover::before,.nav-list a:focus-visible::before{width:6px}
.nav-meta{grid-column:11/span 2;text-align:right;color:var(--line-dark)}
.nav-meta .clock{color:var(--teal-300)}
.nav-burger{display:none;grid-column:12;justify-self:end;background:none;border:0;padding:8px;cursor:pointer}
.nav-burger svg{width:26px;height:14px;stroke:currentColor}

/* mobile sheet */
.sheet{
  position:fixed;inset:0;z-index:99;background:var(--vellum);color:var(--ink-1);
  display:flex;flex-direction:column;justify-content:center;gap:8px;
  padding:var(--margin);
  clip-path:inset(0 0 100% 0);transition:clip-path .5s var(--e-machine);
  visibility:hidden;
}
.sheet.is-open{clip-path:inset(0 0 0 0);visibility:visible}
.sheet a{
  font-family:var(--ff-display);font-weight:600;text-transform:uppercase;font-size:calc(var(--fs-h3)*1.1);
  display:flex;gap:16px;align-items:baseline;
  padding:14px 0;border-bottom:1px solid var(--rule-light);
}
.sheet a .i{font-family:var(--ff-mono);font-size:var(--fs-micro);color:var(--datum-red)}

/* ============================== 02 · HERO =============================== */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;
  padding-top:64px;overflow:hidden}
.hero .grid{width:100%;align-items:center;row-gap:clamp(28px,5vw,56px)}
.hero-copy{grid-column:1/span 6;position:relative;z-index:2}
.hero-kicker{color:var(--teal-300);margin-bottom:22px}
.hero-title{
  font-family:var(--ff-display);font-weight:700;
  font-size:var(--fs-nameplate);line-height:.96;
  letter-spacing:.005em;text-transform:uppercase;margin-bottom:26px;
}
.hero-title .ln{display:block;overflow:hidden;white-space:nowrap}
.hero-title .ln>span{display:block}
.hero-lede{max-width:44ch;margin-bottom:34px;color:color-mix(in srgb,var(--vellum) 74%,transparent)}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px}

.hero-plate{grid-column:7/span 6;position:relative}
.hero-figure{position:relative;aspect-ratio:16/11}
.hero-figure .plate{position:absolute;inset:0}
.hero-figure .plate img{filter:brightness(.8)}
/* faint blueprint grid over the photo */
.hero-figure .netgrid{
  position:absolute;inset:0;pointer-events:none;opacity:.04;
  background-image:linear-gradient(var(--teal-300) 1px,transparent 1px),
                   linear-gradient(90deg,var(--teal-300) 1px,transparent 1px);
  background-size:40px 40px;
}
/* live theodolite canvas */
.hero-canvas{position:absolute;inset:0;pointer-events:none;z-index:3}
/* dimension callout overlay */
.hero-dims{position:absolute;inset:0;pointer-events:none;z-index:4;overflow:visible}
.hero-dims line,.hero-dims path{stroke:var(--teal-300);stroke-width:1;fill:none;vector-effect:non-scaling-stroke}
.hero-dims text{font-family:var(--ff-mono);font-size:9px;letter-spacing:.12em;fill:var(--teal-300)}
/* HUD readout — DOM, not canvas, so it is selectable + accessible */
.hero-hud{
  position:absolute;right:0;bottom:0;z-index:5;
  background:color-mix(in srgb,var(--ink-0) 82%,transparent);
  border:1px solid var(--rule-dark);border-right:0;border-bottom:0;
  padding:12px 16px;display:grid;gap:4px;min-width:210px;
}
.hero-hud div{display:flex;justify-content:space-between;gap:18px;color:var(--line-dark)}
.hero-hud b{font-weight:400;color:var(--teal-300)}

/* ============================== 03 · DATUM STRIP ======================== */
.strip{border-block:1px solid var(--rule-dark);background:var(--ink-0)}
.strip .grid{padding-block:22px}
.strip ul{grid-column:1/-1;display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px 26px}
.strip li{display:flex;align-items:center;gap:12px;color:var(--line-dark)}
.strip li b{font-weight:400;color:var(--vellum)}
.strip li::before{content:"";width:5px;height:5px;background:var(--teal-300);transform:rotate(45deg);flex:none}

/* ============================== 04 · FIRM / BASELINE ==================== */
.firm .eyebrow .label{color:var(--ink-mute)}
.firm-head{grid-column:1/span 8;margin-bottom:clamp(40px,6vw,80px)}
/* The baseline is wider than the viewport by design. It scrolls on its own
   axis so it never depends on a ScrollTrigger pin — which means it still
   works with JS off, under reduced-motion, and for keyboard/touch users. */
.baseline-wrap{
  grid-column:1/-1;position:relative;
  overflow-x:auto;overflow-y:hidden;
  scroll-snap-type:x proximity;
  scrollbar-width:thin;scrollbar-color:var(--line-light) transparent;
  padding-bottom:6px;
}
.baseline-wrap::-webkit-scrollbar{height:3px}
.baseline-wrap::-webkit-scrollbar-thumb{background:var(--line-light)}
.baseline-wrap::-webkit-scrollbar-track{background:var(--rule-light)}
.baseline{
  position:relative;display:flex;gap:clamp(24px,4vw,64px);
  padding-top:56px;padding-bottom:20px;
  width:max-content;min-width:100%;
}
.station{scroll-snap-align:start}
.baseline::before{
  content:"";position:absolute;left:0;right:0;top:56px;height:1px;
  background:var(--rule-light-2);transform-origin:left center;
}
.station{position:relative;flex:1 0 clamp(210px,22vw,290px)}
.station::before{ /* tick riser */
  content:"";position:absolute;left:0;top:-18px;width:1px;height:18px;
  background:var(--line-light);transform-origin:bottom center;
}
.station .yr{
  font-family:var(--ff-display);font-weight:700;font-size:clamp(1.7rem,2.2vw,2.5rem);
  letter-spacing:.01em;color:var(--ink-1);line-height:1;margin-bottom:10px;
}
.station .plate{aspect-ratio:4/3;margin-bottom:12px;filter:grayscale(1);
  transition:filter .5s ease}
.station:hover .plate{filter:grayscale(0)}
.station .cap{color:var(--ink-mute)}

/* ============================== 05 · SERVICES =========================== */
.svc-index{grid-column:1/span 4;position:sticky;top:104px;align-self:start}
.svc-row{
  display:flex;align-items:center;gap:14px;padding:18px 0;
  border-bottom:1px solid var(--rule-dark);color:var(--line-dark);
  cursor:pointer;background:none;border-left:0;border-right:0;border-top:0;
  width:100%;text-align:left;transition:color var(--d-micro);position:relative;
}
.svc-row .dot{
  width:6px;height:6px;border:1px solid var(--line-dark);border-radius:50%;flex:none;
  transition:background var(--d-micro),border-color var(--d-micro),box-shadow var(--d-micro);
}
.svc-row .nm{flex:1}
.svc-row[aria-selected="true"]{color:var(--vellum)}
.svc-row[aria-selected="true"] .dot{background:var(--teal-300);border-color:var(--teal-300);
  box-shadow:0 0 10px var(--teal-300)}
.svc-row[aria-selected="true"]::before{
  content:"";position:absolute;left:-14px;top:50%;width:8px;height:1px;background:var(--teal-300);
}
.svc-panel-wrap{grid-column:6/span 7}
.svc-panel{display:none}
.svc-panel.is-active{display:block}
.svc-panel .h3{margin-bottom:18px}
.svc-panel .lede{margin-bottom:26px}
.svc-specs{display:grid;gap:10px;margin-bottom:30px}
.svc-specs li{display:flex;gap:14px;color:var(--line-dark);padding-bottom:10px;
  border-bottom:1px solid var(--rule-dark)}
.svc-specs li b{font-weight:400;color:var(--teal-300);flex:none;min-width:96px}
.svc-figure{position:relative;aspect-ratio:16/10}
.svc-figure .plate{position:absolute;inset:0}
.svc-diagram{position:absolute;right:14px;bottom:14px;width:clamp(90px,12vw,140px);height:auto;z-index:2}
.svc-diagram *{stroke:var(--teal-300);fill:none;stroke-width:1;vector-effect:non-scaling-stroke}

/* ============================== 06 · SHEETS (projects) ================== */
.sheets-viewport{position:relative;overflow:hidden}
.sheets-track{display:flex;will-change:transform}
.sheet-item{
  flex:0 0 100vw;min-height:100svh;display:flex;align-items:center;
}
.sheet-item .grid{width:100%;align-items:center;row-gap:24px}
.sheet-figure{grid-column:1/span 8;position:relative;aspect-ratio:16/10}
.sheet-figure .plate{position:absolute;inset:0}
/* the duotone copy sits on top and is revealed by the cut line */
.sheet-figure .cut-copy{
  position:absolute;inset:0;overflow:hidden;
  clip-path:inset(0 100% 0 0);           /* JS drives the right inset */
}
.sheet-figure .cut-copy img{filter:url(#blueprint)}
.cutline{
  position:absolute;top:-10px;bottom:-10px;width:1px;background:var(--datum-red);
  left:0;z-index:4;pointer-events:none;
}
.cutline span{
  position:absolute;top:-10px;left:6px;white-space:nowrap;
  font-family:var(--ff-mono);font-size:var(--fs-micro);letter-spacing:.12em;
  color:var(--datum-red);
}
.sheet-block{grid-column:10/span 3;position:relative}
.sheet-ghost{
  position:absolute;right:0;top:-.35em;z-index:0;
  font-family:var(--ff-display);font-weight:700;font-size:24vw;line-height:1;
  color:transparent;-webkit-text-stroke:1px var(--rule-light-2);
  pointer-events:none;user-select:none;
}
.titleblock{position:relative;z-index:1;border:1px solid var(--rule-light-2)}
.titleblock .r{display:grid;grid-template-columns:auto 1fr;gap:10px;
  padding:10px 12px;border-bottom:1px solid var(--rule-light)}
.titleblock .r:last-child{border-bottom:0}
.titleblock .k{color:var(--ink-mute)}
.titleblock .v{color:var(--ink-1);text-align:right}
.titleblock .nm{font-family:var(--ff-display);font-weight:600;text-transform:uppercase;font-size:calc(var(--fs-h3)*1.08);
  letter-spacing:-.015em;text-transform:none;line-height:1.15}

/* ============================== 07 · METRICS ============================ */
.metrics .grid{row-gap:clamp(36px,5vw,56px)}
.metric{grid-column:span 3;position:relative;text-align:left}
.metric .dial{position:absolute;left:-6px;top:-16px;width:96px;height:48px;opacity:.35;z-index:0}
.metric .dial line{stroke:var(--line-dark);stroke-width:1}
.odo{
  position:relative;z-index:1;display:flex;align-items:baseline;
  font-family:var(--ff-body);font-weight:600;
  font-size:var(--fs-h2);line-height:1;letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;color:var(--vellum);
}
.odo .cell{display:inline-block;height:1em;overflow:hidden;vertical-align:bottom}
.odo .cell .strip-d{display:block;will-change:transform}
.odo .cell .strip-d i{display:block;height:1em;line-height:1;font-style:normal}
.odo .fix{color:var(--teal-300)}
.metric .lab{margin-top:16px;padding-top:12px;border-top:1px solid var(--rule-dark);
  color:var(--line-dark)}

/* ============================== 08 · THEATRE (offices) ================== */
.theatre-map{grid-column:1/span 9;position:relative}
.theatre-map svg{width:100%;height:auto;overflow:visible}
.theatre-map .land{stroke:var(--rule-dark-2);stroke-width:1;fill:none;vector-effect:non-scaling-stroke}
.theatre-map .arc{stroke:var(--teal-300);stroke-width:1;fill:none;opacity:.45}
.bm{cursor:pointer}
.bm circle{fill:none;stroke:var(--teal-300);stroke-width:1;transition:stroke .25s}
.bm .x{stroke:var(--teal-300);stroke-width:1}
.bm text{font-family:var(--ff-mono);font-size:8px;letter-spacing:.1em;fill:var(--line-dark)}
.bm.is-origin circle,.bm.is-origin .x{stroke:var(--datum-red)}
.bm:hover circle,.bm.is-on circle{stroke:var(--vellum);filter:drop-shadow(0 0 6px var(--teal-300))}
.bm:hover text,.bm.is-on text{fill:var(--vellum)}
.office-reg{grid-column:11/span 2}
.office-reg li{padding:9px 0;border-bottom:1px solid var(--rule-dark)}
.office-reg button{background:none;border:0;padding:0;width:100%;text-align:left;
  cursor:pointer;color:var(--line-dark);display:flex;justify-content:space-between;gap:10px;
  transition:color var(--d-micro)}
.office-reg button:hover,.office-reg button.is-on{color:var(--teal-300)}

/* ============================== 09 · REGISTER (clients) ================= */
.reg-grid{grid-column:1/-1;display:grid;grid-template-columns:repeat(8,1fr);
  border-top:1px solid var(--rule-light);border-left:1px solid var(--rule-light)}
.reg-cell{
  position:relative;aspect-ratio:3/2;display:flex;align-items:center;justify-content:center;
  padding:22px 16px;border-right:1px solid var(--rule-light);
  border-bottom:1px solid var(--rule-light);transition:border-color var(--d-micro);
}
/* --line-light is a hairline colour, not a text colour: at 10px on vellum it
   measures 2.63:1. Index labels use the muted ink instead so the register
   stays readable at AA. */
.reg-cell .ix{position:absolute;top:7px;left:9px;color:var(--ink-mute);
  font-family:var(--ff-mono);font-size:var(--fs-micro);letter-spacing:.1em}
/* Client marks are reproduced in their own colours — no grayscale, no
   opacity veil. A register of real clients should look like the real marks. */
.reg-cell img{max-height:52px;width:auto;object-fit:contain;
  transition:transform var(--d-micro)}
.reg-cell:hover img{transform:scale(1.04)}
.reg-cell:hover{border-color:var(--teal-500)}

/* ============================== 10 · AOR STAMP ========================== */
.aor{min-height:50vh;display:flex;align-items:center}
.aor-copy{grid-column:1/span 7}
.aor-stamp{grid-column:9/span 3;display:flex;justify-content:center;position:relative}
.stamp{width:min(260px,60vw);height:auto;position:relative}
.stamp .ring{animation:spin 120s linear infinite}
.stamp text{font-family:var(--ff-mono);font-size:7.4px;letter-spacing:.24em;
  fill:var(--vellum);opacity:.75;text-transform:uppercase}
.stamp .mark{fill:var(--vellum);opacity:.9}
.stamp .rev{
  font-family:var(--ff-mono);font-size:9px;letter-spacing:.2em;
  fill:var(--datum-red);text-anchor:middle;
}
.stamp .revline{stroke:var(--datum-red);stroke-width:1}
@keyframes spin{to{transform:rotate(360deg)}}

/* ============================== 11 · CONTACT ============================ */
.tb-form{grid-column:2/span 10;border:1px solid var(--rule-light-2);background:var(--vellum-2)}
.tb-row{display:grid;grid-template-columns:200px 1fr;border-bottom:1px solid var(--rule-light)}
.tb-row:last-of-type{border-bottom:0}
.tb-row label{padding:16px 18px;border-right:1px solid var(--rule-light);
  color:var(--ink-mute);display:flex;align-items:center}
.tb-row .fld{padding:6px 10px;display:flex;align-items:center}
.tb-row input,.tb-row select,.tb-row textarea{
  width:100%;background:transparent;border:0;padding:10px 8px;
  font-family:var(--ff-body);color:var(--ink-1);outline:0;
  border-bottom:1px solid transparent;transition:border-color var(--d-micro);
}
.tb-row textarea{resize:vertical;min-height:96px}
.tb-row input:focus,.tb-row select:focus,.tb-row textarea:focus{border-bottom-color:var(--teal-500)}
.tb-meta{grid-column:2/span 10;display:flex;flex-wrap:wrap;gap:18px 40px;
  margin-top:14px;color:var(--ink-mute)}
.tb-submit{grid-column:2/span 10;margin-top:22px}
.offices-3{grid-column:2/span 10;display:grid;grid-template-columns:repeat(3,1fr);
  gap:var(--gutter);margin-top:clamp(48px,6vw,84px)}
.offices-3 .o{border-top:1px solid var(--rule-light-2);padding-top:16px;color:var(--ink-mute)}
.offices-3 .o b{display:block;color:var(--ink-1);font-weight:400;margin-bottom:8px}

/* ============================== 12 · FOOTER ============================= */
.foot-mark{grid-column:1/-1;margin-bottom:clamp(40px,6vw,72px)}
.foot-mark svg{width:100%;height:auto;overflow:visible}
.foot-mark text{
  font-family:var(--ff-display);font-weight:700;font-size:118px;letter-spacing:.01em;
  fill:transparent;stroke:var(--vellum);stroke-width:1;opacity:.55;
}
.foot-cols{grid-column:1/span 9;display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gutter)}
.foot-cols h4{color:var(--teal-300);margin-bottom:14px}
.foot-cols li{padding:5px 0}
.foot-cols a{color:var(--line-dark);transition:color var(--d-micro)}
.foot-cols a:hover{color:var(--vellum)}
.foot-rail{
  grid-column:1/-1;margin-top:clamp(40px,5vw,64px);padding-top:18px;
  border-top:1px solid var(--rule-dark);
  display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:space-between;
  color:var(--line-dark);
}

/* ============================== CHAINAGE RAIL =========================== */
.chainage{
  position:fixed;top:0;right:0;bottom:0;width:var(--rail);z-index:90;
  pointer-events:none;
  border-left:1px solid var(--rule-dark);
  background:linear-gradient(to left,color-mix(in srgb,var(--ink-0) 55%,transparent),transparent);
}
.chainage .ticks{position:absolute;inset:0;width:100%;height:100%}
.chainage .ticks line{stroke:var(--line-dark);stroke-width:1;opacity:.45}
.chainage .ticks line.maj{opacity:.8;stroke:var(--line-dark)}
.chainage .stations{position:absolute;inset:0;pointer-events:auto}
.chainage .st{
  position:absolute;right:5px;transform:translateY(-50%);
  font-family:var(--ff-mono);font-size:7.5px;letter-spacing:.06em;
  color:var(--line-dark);writing-mode:vertical-rl;white-space:nowrap;
  padding:3px 1px;transition:color var(--d-micro);
  max-height:150px;overflow:hidden;
}
.chainage .st:hover,.chainage .st:focus-visible{color:var(--teal-300)}
.needle{position:absolute;left:0;right:0;height:0;will-change:transform}
.needle::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:var(--datum-red)}
.needle::after{
  content:"";position:absolute;left:2px;top:-3.5px;
  border:3.5px solid transparent;border-left-color:var(--datum-red);
}
.needle .read{
  position:absolute;right:4px;top:4px;white-space:nowrap;
  font-family:var(--ff-mono);font-size:8px;letter-spacing:.1em;color:var(--datum-red);
}
/* the vellum sections need dark-on-light rail ticks */
.chainage.on-light{border-left-color:var(--rule-light)}
.chainage.on-light .ticks line{stroke:var(--line-light)}
.chainage.on-light .st{color:var(--ink-mute)}

/* ============================== BOOT ==================================== */
.boot{
  position:fixed;inset:0;z-index:200;background:var(--vellum);color:var(--ink-1);
  display:flex;align-items:center;justify-content:center;
}
.boot-logo{width:min(300px,55vw);height:auto}
.boot-logo path,.boot-logo polygon,.boot-logo rect,.boot-logo circle{
  fill:none;stroke:var(--ink-1);stroke-width:1;
}
.boot-list{position:absolute;left:var(--margin);bottom:var(--margin);display:grid;gap:6px}
.boot-list li{color:var(--ink-mute);clip-path:inset(0 100% 0 0)}
.boot-list li b{font-weight:400;color:var(--teal-500)}
.boot-dwg{position:absolute;right:var(--margin);bottom:var(--margin);color:var(--line-light)}
.boot-tick{position:absolute;left:50%;top:62%;width:14px;height:14px;opacity:0}
.boot-tick line{stroke:var(--datum-red);stroke-width:1.5}

/* ============================== RESPONSIVE ============================== */
@media(max-width:1200px){
  .hero-copy{grid-column:1/span 6}
  .hero-plate{grid-column:7/span 6}
  .svc-panel-wrap{grid-column:6/span 7}
  .theatre-map{grid-column:1/span 8}
  .office-reg{grid-column:10/span 3}
}
@media(max-width:1023px){
  :root{--rail:0px}
  .chainage{display:none}
  .nav-list{display:none}
  /* The burger needs a real hit area — a single 12th column collapses to
     ~16px at 375px and clips the icon. Give it two columns. */
  .nav-logo{grid-column:1/span 5}
  .nav-meta{grid-column:6/span 5;text-align:right}
  .nav-burger{display:block;grid-column:11/span 2;justify-self:end;width:44px;height:44px}
  .nav-burger svg{width:26px;height:14px;stroke-width:1.5;margin-inline:auto}
  .reg-grid{grid-template-columns:repeat(4,1fr)}
  .foot-cols{grid-column:1/-1;grid-template-columns:repeat(2,1fr);gap:28px}
}
@media(max-width:860px){
  .hero{min-height:auto;padding-block:104px clamp(48px,8vw,80px)}
  .hero-copy{grid-column:1/-1}
  .hero-plate{grid-column:1/-1}
  .hero-figure{aspect-ratio:4/3}
  .svc-index{grid-column:1/-1;position:static}
  .svc-panel-wrap{grid-column:1/-1;margin-top:28px}
  .metric{grid-column:span 6}
  .sheet-item{flex:0 0 100%;min-height:auto;padding-block:44px}
  .sheet-figure{grid-column:1/-1}
  .sheet-block{grid-column:1/-1}
  .sheet-ghost{font-size:34vw;top:auto;bottom:100%}
  .theatre-map{grid-column:1/-1}
  .office-reg{grid-column:1/-1;margin-top:32px;
    display:grid;grid-template-columns:repeat(2,1fr);gap:0 24px}
  .tb-form,.tb-meta,.tb-submit,.offices-3{grid-column:1/-1}
  .tb-row{grid-template-columns:1fr}
  .tb-row label{border-right:0;border-bottom:1px solid var(--rule-light);padding-bottom:8px}
  .offices-3{grid-template-columns:1fr;gap:26px}
  .baseline{flex-direction:column;padding-top:0;padding-left:26px}
  .baseline::before{left:0;right:auto;top:0;bottom:0;width:1px;height:auto}
  .station{flex:none}
  .station::before{left:-26px;top:10px;width:18px;height:1px}
  .foot-mark text{font-size:60px}
}
@media(max-width:560px){
  /* keep the live clock (the heartbeat), drop the site coordinates —
     three wrapped lines will not sit in a 64px bar */
  .nav-meta div:last-child{display:none}
  .hero-cta .btn{flex:1 1 auto;justify-content:center}
  .reg-grid{grid-template-columns:repeat(3,1fr)}
  .metric{grid-column:1/-1}
  .strip ul{flex-direction:column;gap:10px}
  .hero-hud{position:static;margin-top:14px;border:1px solid var(--rule-dark);min-width:0}
}

/* ============================== REDUCED MOTION ==========================
   Not a fallback — a first-class art direction. Everything renders final. */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .boot{display:none}
  .hero-canvas{display:none}
  /* No pin means no horizontal travel — the drawing set becomes a vertical
     stack of sheets rather than a row that runs off the side of the page. */
  .sheets-track{transform:none !important;flex-direction:column}
  .sheet-item{flex:0 0 auto;min-height:auto;padding-block:clamp(40px,6vw,72px)}
  .sheets-viewport{overflow:visible}
  .sheet-figure .cut-copy{clip-path:inset(0 100% 0 0)}
  .stamp .ring{animation:none}
  .boot-list li{clip-path:none}
}

/* ============================== PRINT =================================== */
@media print{
  .chainage,.nav,.boot,.hero-canvas{display:none}
  body{background:#fff;color:#000}
}

/* ---- theme toggle ------------------------------------------------------ */
.theme-btn{
  background:none;border:1px solid var(--rule-dark-2);cursor:pointer;
  width:34px;height:34px;display:grid;place-items:center;flex:none;
  color:currentColor;transition:border-color var(--d-micro),color var(--d-micro);
}
.theme-btn:hover,.theme-btn:focus-visible{border-color:var(--teal-300);color:var(--teal-300)}
.theme-btn svg{width:15px;height:15px;stroke:currentColor;fill:none;stroke-width:1.2}
.theme-btn .sun{display:none}
[data-theme=light] .theme-btn .sun{display:block}
[data-theme=light] .theme-btn .moon{display:none}
.nav-meta{display:flex;align-items:center;justify-content:flex-end;gap:14px}
.nav-meta .readouts{text-align:right}
@media(max-width:1023px){ .nav-meta{grid-column:6/span 4} .theme-btn{width:30px;height:30px} }