:root{
  --blue:#1B3A5C;
  --blue-deep:#142C46;
  --cyan:#BFE3F0;
  --cyan-line:#8FC9DE;
  --cream:#FAF7F1;
  --ink:#2B2B2F;
  --ink-soft:#5A5A62;
  --rule:#D8D2C6;
  --mono:"Overpass Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:"Archivo",system-ui,-apple-system,Segoe UI,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--cream);color:var(--ink);
  font-family:var(--sans);font-size:17px;line-height:1.68;
}
a{color:var(--blue);text-underline-offset:3px}
img{max-width:100%}
h1,h2,h3{font-family:var(--sans);font-weight:600;letter-spacing:-.015em;line-height:1.15;margin:0}
.tb-key{
  font-family:var(--mono);font-size:10px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan-line);
  display:block;
}
main .tb-key,.planhead .tb-key,.closing .tb-key,.sheet .tb-key,.diagram-head .tb-key,.prose-head .tb-key,.chapnote .tb-key{color:#7C94AB}

/* ---------- title block header ---------- */
.titleblock{background:var(--blue);border-bottom:2px solid var(--cyan-line)}
.tb-inner{
  max-width:1160px;margin:0 auto;padding:0 20px;
  display:flex;flex-wrap:wrap;align-items:stretch;
}
.tb-project{
  padding:16px 26px 14px 0;border-right:1px solid rgba(191,227,240,.35);
  display:flex;flex-direction:column;justify-content:center;min-width:240px;
}
.tb-title{
  font-family:var(--sans);font-weight:700;font-size:19px;letter-spacing:-.01em;
  color:#fff;text-decoration:none;margin-top:5px;
}
.tb-sub{font-family:var(--mono);font-size:11px;color:var(--cyan);opacity:.75;margin-top:3px}
.tb-scale{
  padding:16px 26px;border-right:1px solid rgba(191,227,240,.35);
  display:flex;flex-direction:column;justify-content:center;
}
.tb-scale .tb-val{font-family:var(--mono);font-size:12px;color:var(--cyan);margin-top:5px}
.tb-fields{display:flex;margin-left:auto}
.tb-field{
  display:flex;flex-direction:column;justify-content:center;
  padding:16px 18px;text-decoration:none;
  border-left:1px solid rgba(191,227,240,.35);
}
.tb-field .tb-val{
  font-family:var(--sans);font-weight:500;font-size:14px;color:#fff;margin-top:5px;white-space:nowrap;
}
.tb-field:hover{background:var(--blue-deep)}
.tb-field.is-active{background:var(--blue-deep);box-shadow:inset 0 -3px 0 var(--cyan)}
.navtoggle,.navburger{display:none}

/* ---------- hero sheet ---------- */
main{max-width:1160px;margin:0 auto;padding:0 20px}
.sheet{padding:46px 0 10px}
.sheet-frame{position:relative;border:1px solid var(--cyan-line);padding:38px 40px 42px;background:#fff}
.sheet-inner{max-width:830px}
.sheet-hero-layout{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:36px 42px;
  align-items:center;
}
.sheet-copy{max-width:560px}
.tick{position:absolute;width:20px;height:20px}
.tick-tl{top:-1px;left:-1px;border-top:3px solid var(--blue);border-left:3px solid var(--blue)}
.tick-tr{top:-1px;right:-1px;border-top:3px solid var(--blue);border-right:3px solid var(--blue)}
.tick-bl{bottom:-1px;left:-1px;border-bottom:3px solid var(--blue);border-left:3px solid var(--blue)}
.tick-br{bottom:-1px;right:-1px;border-bottom:3px solid var(--blue);border-right:3px solid var(--blue)}
.sheet h1{font-size:clamp(30px,4.4vw,50px);margin:12px 0 0;color:var(--blue)}
.standfirst{font-size:18.5px;color:var(--ink-soft);max-width:66ch;margin:16px 0 0}
.hero-meta{
  display:flex;align-items:center;flex-wrap:wrap;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  color:#7C94AB;margin:22px 0 0;
}
.plate{margin:0}
.plate-live{margin:0}
.plate-frame{
  position:relative;aspect-ratio:1/1;width:100%;
  border:1px solid var(--cyan-line);background:#0F1C2A;overflow:hidden;
}
.plate-frame::before{
  content:"";position:absolute;inset:10px;border:1px solid rgba(191,227,240,.35);
  pointer-events:none;z-index:2;
}
.plate-frame::after{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:
    linear-gradient(180deg,rgba(20,44,70,.08) 0%,transparent 28%,rgba(20,44,70,.18) 100%),
    radial-gradient(ellipse at 50% 20%,transparent 40%,rgba(15,28,42,.22) 100%);
}
.plate-frame img{
  display:block;width:100%;height:100%;object-fit:cover;object-position:center;
  transform:scale(1.02);
  animation:plate-in 1.1s cubic-bezier(.22,1,.36,1) both;
}
@keyframes plate-in{
  from{opacity:0;transform:scale(1.06)}
  to{opacity:1;transform:scale(1.02)}
}
.plate-box{
  position:relative;aspect-ratio:3/2;width:100%;
  border:1px solid var(--cyan-line);background:
    repeating-linear-gradient(135deg,rgba(191,227,240,.30) 0 1px,transparent 1px 13px), #F7FBFD;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
}
.plate-mark{font-family:var(--mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--blue)}
.plate-dim{font-family:var(--mono);font-size:11px;color:#7C94AB}
.plate figcaption{
  font-family:var(--mono);font-size:11.5px;color:var(--ink-soft);
  margin-top:12px;line-height:1.6;letter-spacing:.04em;
}
.sheet-copy .standfirst,.sheet-copy h1{
  animation:copy-in .8s cubic-bezier(.22,1,.36,1) both;
}
.sheet-copy h1{animation-delay:.08s}
.sheet-copy .standfirst{animation-delay:.16s}
.sheet-copy .hero-meta,.sheet-copy .planscale{animation:copy-in .8s cubic-bezier(.22,1,.36,1) .24s both}
@keyframes copy-in{
  from{opacity:0;transform:translateY(10px)}
  to{opacity:1;transform:none}
}
@media (prefers-reduced-motion:reduce){
  .plate-frame img,.sheet-copy h1,.sheet-copy .standfirst,
  .sheet-copy .hero-meta,.sheet-copy .planscale{animation:none}
}

/* ---------- dimension lines ---------- */
.dimline{
  display:inline-block;height:1px;background:var(--cyan-line);
  vertical-align:middle;position:relative;
  width:34px;margin:0 12px;
}
.dimline::before,.dimline::after{
  content:"";position:absolute;top:-4px;width:1px;height:9px;background:var(--cyan-line);
}
.dimline::before{left:0}
.dimline::after{right:0}
.tickmark{color:var(--cyan-line);padding:0 4px}
.room-dims,.planscale,.zone-dim{display:flex;align-items:center}
.room-dims .dimline:last-child,
.planscale .dimline:last-child,
.zone-dim .dimline:last-child{flex:1 1 auto;width:auto;min-width:24px}

/* ---------- zone diagram ---------- */
.diagram{padding:58px 0 8px}
.diagram-head{max-width:70ch}
.diagram-head h2{font-size:clamp(24px,3vw,33px);color:var(--blue);margin:10px 0 0}
.diagram-note{color:var(--ink-soft);margin:12px 0 0}
.origin{display:flex;flex-direction:column;align-items:center;margin:34px 0 0;position:relative}
.origin-dot{width:9px;height:9px;border:2px solid var(--blue);border-radius:50%;background:var(--cream)}
.origin-dot::after{content:"";display:block;width:1px;height:26px;background:var(--cyan-line);margin:9px auto 0}
.origin-label{font-family:var(--mono);font-size:10px;letter-spacing:.18em;color:#7C94AB;margin-top:32px}
.zones{margin-top:14px}
.zone-row{
  display:grid;grid-template-columns:repeat(2,1fr);gap:0;
  border-top:1px solid var(--cyan-line);position:relative;
}
.zone-row + .zone-row{margin-top:26px}
.zone-row + .zone-row::before{
  content:"";position:absolute;left:50%;top:-27px;width:1px;height:27px;background:var(--cyan-line);
}
.zone{
  position:relative;border:1px solid var(--blue);margin:26px;padding:26px 24px 24px;background:#fff;
}
.zone::before{
  content:"";position:absolute;top:-27px;left:50%;width:1px;height:26px;background:var(--cyan-line);
}
.zone::after{
  content:"";position:absolute;top:-27px;left:calc(50% - 6px);width:13px;height:1px;background:var(--cyan-line);
}
.zone-tag{
  font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.16em;
  color:#fff;background:var(--blue);padding:3px 8px;display:inline-block;
}
.zone h3{font-size:22px;margin:14px 0 0}
.zone h3 a{color:var(--blue);text-decoration:none}
.zone h3 a:hover{text-decoration:underline}
.zone p{color:var(--ink-soft);font-size:15.5px;margin:10px 0 0}
.zone-dim{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:#7C94AB !important;margin-top:16px !important}
.zone-link{
  display:inline-block;margin-top:14px;font-family:var(--mono);font-size:11.5px;
  letter-spacing:.12em;text-transform:uppercase;color:var(--blue);text-decoration:none;
  border-bottom:1px solid var(--cyan-line);padding-bottom:3px;
}
.zone-link:hover{border-bottom-color:var(--blue)}

/* ---------- closing ---------- */
.closing{margin:52px 0 70px;border-top:1px solid var(--rule);padding-top:22px;max-width:74ch}
.closing p{margin:10px 0 0;color:var(--ink-soft)}

/* ---------- category ---------- */
.planhead{padding:46px 0 0;max-width:74ch}
.planhead h1{font-size:clamp(28px,4vw,46px);color:var(--blue);margin:12px 0 0}
.planscale{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:#7C94AB;margin-top:18px}
.chapnote{
  margin:26px 0 0;border-left:3px solid var(--cyan);background:#F7FBFD;
  padding:16px 20px;max-width:78ch;
}
.chapnote p{margin:8px 0 0;font-size:16px;color:var(--ink-soft)}
.rooms{margin:40px 0 74px;display:flex;flex-direction:column;gap:46px}
.room{
  position:relative;border:1px solid var(--blue);background:#fff;
  padding:30px 34px 28px;
}
.room-tag{
  position:absolute;top:-12px;left:26px;
  font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.16em;
  background:var(--blue);color:#fff;padding:4px 10px;
}
.room-body{max-width:78ch}
.room h2{font-size:clamp(21px,2.6vw,29px);color:var(--blue);margin-top:6px}
.room-loc{font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:#7C94AB;margin:8px 0 16px}
.room p{margin:0}
.room-dims{
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
  color:#7C94AB;margin-top:22px !important;border-top:1px solid var(--cyan);padding-top:14px;
}

/* ---------- prose pages ---------- */
.prose{max-width:74ch;padding-bottom:74px}
.prose-head{padding:48px 0 0;border-bottom:1px solid var(--rule);padding-bottom:22px}
.prose-head h1{font-size:clamp(28px,4vw,44px);color:var(--blue);margin-top:12px}
.prose h2{font-size:20px;color:var(--blue);margin:34px 0 0}
.prose p{margin:14px 0 0;color:var(--ink-soft)}
.prose p strong{color:var(--ink)}

/* ---------- footer ---------- */
.sheetfoot{background:var(--blue);color:#DCE8F1;margin-top:0;padding:44px 20px 30px}
.foot-grid{
  max-width:1160px;margin:0 auto;display:grid;
  grid-template-columns:2fr 1fr 1fr;gap:38px;
}
.foot-name{font-family:var(--sans);font-weight:700;font-size:17px;color:#fff;margin:10px 0 0}
.foot-col p{font-size:14.5px;line-height:1.65;margin:10px 0 0;color:rgba(220,232,241,.82)}
.foot-col ul{list-style:none;margin:12px 0 0;padding:0}
.foot-col li{margin:0 0 8px}
.foot-col a{color:#DCE8F1;text-decoration:none;font-size:14.5px}
.foot-col a:hover{color:#fff;text-decoration:underline}
.foot-rule{
  max-width:1160px;margin:34px auto 0;padding-top:18px;
  border-top:1px solid rgba(191,227,240,.3);
  font-family:var(--mono);font-size:11px;line-height:1.75;color:rgba(191,227,240,.72);
}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .foot-about{grid-column:1/-1}
}
@media (max-width:860px){
  body{font-size:16.5px}
  .tb-inner{padding:0 16px;position:relative}
  .tb-project{border-right:0;padding:14px 60px 12px 0;min-width:0;flex:1}
  .tb-scale{display:none}
  .navburger{
    display:flex;flex-direction:column;justify-content:center;gap:5px;
    position:absolute;right:16px;top:16px;width:34px;height:30px;cursor:pointer;z-index:5;
  }
  .navburger span{display:block;height:2px;background:var(--cyan)}
  .tb-fields{
    display:none;width:100%;flex-direction:column;margin:0 0 10px;
    border-top:1px solid rgba(191,227,240,.35);
  }
  .navtoggle:checked ~ .tb-fields{display:flex}
  .tb-field{border-left:0;border-bottom:1px solid rgba(191,227,240,.22);padding:12px 0}
  .tb-field.is-active{box-shadow:inset 3px 0 0 var(--cyan);padding-left:12px}
  main{padding:0 16px}
  .sheet{padding:28px 0 0}
  .sheet-frame{padding:24px 20px 26px}
  .sheet-hero-layout{grid-template-columns:1fr;gap:28px}
  .sheet-copy{max-width:none}
  .plate-frame::before{inset:8px}
  .zone-row{grid-template-columns:1fr;border-top:0}
  .zone-row + .zone-row{margin-top:0}
  .zone-row + .zone-row::before{display:none}
  .zone{margin:26px 0 0}
  .zone:first-child::before,.zone:first-child::after{top:-27px}
  .zone::before{left:28px}
  .zone::after{left:22px}
  .origin{margin-top:26px}
  .room{padding:26px 20px 24px}
  .room-tag{left:16px}
  .sheetfoot{padding:34px 16px 26px}
  .foot-grid{grid-template-columns:1fr;gap:26px}
}