:root{
  --bg:#FAF5F2; --bg2:#F3ECE6; --card:#FFFFFF;
  --ink:#191512; --ink2:#3F3833; --muted:#7A726C;
  --line:#E6DDD5; --line2:#D9CDC2;
  --accent:#C07A12; --accent2:#D97706; --brass:#B08D57;
  --dark:#17130F; --dark2:#221B15;
  --display:'Reem Kufi',system-ui,sans-serif;
  --body:'IBM Plex Sans Arabic',system-ui,sans-serif;
  --r:18px; --r-sm:12px;
  --sh:0 1px 2px rgba(25,21,18,.04),0 12px 32px -12px rgba(25,21,18,.14);
  --sh-lg:0 24px 60px -20px rgba(25,21,18,.28);
  --max:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--body);font-size:16.5px;line-height:1.85;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--display);font-weight:600;line-height:1.3;margin:0;letter-spacing:-.01em}
p{margin:0}
a{color:inherit;text-decoration:none}
ul{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer}
.eyebrow{
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--accent);font-weight:600;margin-bottom:.5rem
}
.section{max-width:var(--max);margin:0 auto;padding:clamp(3.5rem,7vw,6rem) clamp(1.1rem,4vw,2rem)}
.section.alt{background:var(--bg2);max-width:none}
.section.alt>*{max-width:var(--max);margin-inline:auto}
.section-head{max-width:760px;margin-bottom:clamp(2rem,4vw,3.2rem)}
.section-head h2{font-size:clamp(1.7rem,3.6vw,2.6rem);margin-bottom:.85rem}
.section-lede{color:var(--ink2);font-size:1.02rem}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:60;display:flex;align-items:center;justify-content:space-between;
  gap:1rem;padding:.7rem clamp(1.1rem,4vw,2rem);
  background:rgba(250,245,242,.82);backdrop-filter:blur(16px) saturate(1.4);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:.7rem}
.brand-mark{
  width:34px;height:34px;border-radius:10px;flex:none;
  background:linear-gradient(140deg,var(--brass),var(--accent) 60%,#8a5310);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.35),0 6px 16px -6px rgba(192,122,18,.7);
  position:relative;
}
.brand-mark::after{
  content:"";position:absolute;inset:9px;border-radius:3px;
  border:1.6px solid rgba(255,255,255,.75);border-top-color:transparent;transform:rotate(45deg)
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-family:var(--display);font-size:1rem;font-weight:600}
.brand-text small{font-size:.7rem;color:var(--muted);letter-spacing:.06em}
.nav-links{display:flex;gap:.35rem;flex-wrap:wrap}
.nav-links a{
  font-size:.86rem;color:var(--ink2);padding:.42rem .8rem;border-radius:999px;
  transition:background .22s ease,color .22s ease
}
.nav-links a:hover{background:rgba(192,122,18,.1);color:var(--accent)}

/* ---------- hero / viewer ---------- */
.hero{max-width:var(--max);margin:0 auto;padding:clamp(1rem,2.5vw,1.8rem) clamp(1.1rem,4vw,2rem) 0}
.viewer-wrap{
  position:relative;border-radius:var(--r);overflow:hidden;background:var(--dark);
  box-shadow:var(--sh-lg);border:1px solid rgba(255,255,255,.06)
}
#viewer{position:relative;width:100%;height:clamp(420px,64vh,720px);touch-action:none;cursor:grab}
#viewer:active{cursor:grabbing}
#viewer canvas{display:block;width:100%;height:100%}
.viewer-wrap::after{
  content:"";position:absolute;inset:0;pointer-events:none;border-radius:var(--r);
  background:linear-gradient(to top,rgba(23,19,15,.72) 0%,rgba(23,19,15,0) 34%),
             linear-gradient(to bottom,rgba(23,19,15,.6) 0%,rgba(23,19,15,0) 30%)
}
.viewer-top,.viewer-bottom{position:absolute;left:0;right:0;z-index:5;padding:clamp(1.1rem,2.6vw,2rem);pointer-events:none}
.viewer-top{top:0}
.viewer-bottom{bottom:0;display:flex;flex-wrap:wrap;gap:.6rem;align-items:flex-end;justify-content:space-between}
.hero-copy{color:#F6F0E8;max-width:640px}
.hero-copy .eyebrow{color:#E4B978}
.hero-copy h1{font-size:clamp(1.55rem,4.2vw,2.7rem);font-weight:600;text-shadow:0 2px 20px rgba(0,0,0,.5)}
.hero-copy h1 span{color:#E4B978}
.hero-copy .lede{margin-top:.6rem;font-size:clamp(.88rem,1.6vw,1rem);color:rgba(246,240,232,.82);max-width:520px}

.seg{display:flex;flex-wrap:wrap;gap:.3rem;padding:.3rem;border-radius:999px;pointer-events:auto;
  background:rgba(255,255,255,.1);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.16)}
.seg-btn{
  border:0;background:transparent;color:rgba(246,240,232,.8);font-size:.8rem;font-weight:500;
  padding:.44rem .9rem;border-radius:999px;transition:.25s ease;white-space:nowrap
}
.seg-btn:hover{background:rgba(255,255,255,.13);color:#fff}
.seg-btn.is-active{background:#F6F0E8;color:var(--dark);box-shadow:0 4px 14px -4px rgba(0,0,0,.5)}
.toggles{display:flex;gap:.4rem;pointer-events:auto}
.pill{
  border:1px solid rgba(255,255,255,.2);background:rgba(23,19,15,.4);color:rgba(246,240,232,.85);
  font-size:.78rem;padding:.44rem .95rem;border-radius:999px;backdrop-filter:blur(12px);transition:.25s ease
}
.pill:hover{border-color:rgba(228,185,120,.7);color:#fff}
.pill[aria-pressed="true"]{background:#E4B978;border-color:#E4B978;color:#2A1F0E;font-weight:600}
.viewer-hint{
  position:absolute;bottom:.35rem;left:0;right:0;text-align:center;z-index:5;
  font-size:.68rem;color:rgba(246,240,232,.5);pointer-events:none;margin:0
}
.loading{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:.7rem;
  color:rgba(246,240,232,.75);font-size:.85rem;z-index:8;background:var(--dark)
}
.loading.hide{opacity:0;visibility:hidden;transition:opacity .5s ease}
.spinner{width:16px;height:16px;border-radius:50%;border:2px solid rgba(228,185,120,.25);
  border-top-color:#E4B978;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* CSS2D dimension labels */
.dim-label{
  font-family:var(--body);font-size:11px;font-weight:500;color:#fff;white-space:nowrap;
  background:rgba(23,19,15,.82);border:1px solid rgba(228,185,120,.5);color:#E9CE9F;
  padding:2px 8px;border-radius:999px;transform:translate(-50%,-50%);letter-spacing:.02em
}
.dim-label.soft{background:rgba(23,19,15,.6);color:rgba(233,206,159,.9);border-color:rgba(228,185,120,.28)}

/* ---------- stats band ---------- */
.band{background:var(--dark);color:#F3ECE4;margin-top:clamp(1.6rem,3vw,2.6rem)}
.stats{
  max-width:var(--max);margin:0 auto;padding:clamp(1.6rem,3.4vw,2.6rem) clamp(1.1rem,4vw,2rem);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:clamp(1rem,2.4vw,2rem)
}
.stat{border-right:1px solid rgba(255,255,255,.1);padding-right:1.1rem}
.stat:first-child{border-right:0;padding-right:0}
.stat b{display:block;font-family:var(--display);font-size:clamp(1.35rem,2.6vw,1.85rem);color:#E4B978;font-weight:600}
.stat span{font-size:.79rem;color:rgba(243,236,228,.66)}

/* ---------- plan ---------- */
.plan-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:clamp(1.3rem,3vw,2.6rem);align-items:start}
.plan-card{
  margin:0;background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:clamp(1rem,2.2vw,1.7rem);box-shadow:var(--sh)
}
.plan-card svg{width:100%;height:auto}
.plan-card figcaption{margin-top:1rem;font-size:.78rem;color:var(--muted);line-height:1.7}
.plabel{font-family:var(--body);font-size:12.5px;fill:#3F3833;font-weight:500}
.plabel.on-dark{fill:#F1E9DF}
.plabel.on-wood{fill:#F6EFE6}
.dim{font-family:var(--body);font-size:13px;fill:#7A726C;font-weight:500}
.plan-notes h3{font-size:1.25rem;margin-bottom:.7rem}
.plan-notes>p{color:var(--ink2);font-size:.95rem;margin-bottom:1.1rem}
.ticks li{position:relative;padding-inline-start:1.6rem;margin-bottom:.7rem;font-size:.92rem;color:var(--ink2)}
.ticks li::before{
  content:"";position:absolute;inset-inline-start:0;top:.72em;width:9px;height:9px;border-radius:2px;
  background:var(--accent);transform:rotate(45deg) translateY(-50%)
}
.ticks b{color:var(--ink);font-weight:600}

/* ---------- zones ---------- */
.zone-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(255px,1fr));gap:1.1rem}
.zone{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:1.5rem 1.4rem;
  position:relative;transition:transform .3s ease,box-shadow .3s ease
}
.zone:hover{transform:translateY(-4px);box-shadow:var(--sh)}
.zone-num{
  position:absolute;top:-14px;inset-inline-start:1.4rem;width:30px;height:30px;border-radius:50%;
  background:var(--dark);color:#E4B978;font-family:var(--display);font-size:.9rem;
  display:flex;align-items:center;justify-content:center
}
.zone h3{font-size:1.08rem;margin:1rem 0 .5rem}
.zone p{font-size:.9rem;color:var(--ink2)}
.zone dl{display:grid;grid-template-columns:auto 1fr;gap:.3rem .8rem;margin:1rem 0 0;
  padding-top:.9rem;border-top:1px dashed var(--line2);font-size:.82rem}
.zone dt{color:var(--muted)}
.zone dd{margin:0;font-weight:500;text-align:end}

.triangle-card{
  margin-top:1.2rem;background:var(--dark);color:#F3ECE4;border-radius:var(--r);
  padding:clamp(1.4rem,3vw,2.1rem);display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);
  gap:clamp(1.2rem,3vw,2.4rem);align-items:center
}
.tri-copy h3{font-size:1.2rem;color:#fff;margin-bottom:.55rem}
.tri-copy p{font-size:.88rem;color:rgba(243,236,228,.66)}
.metrics li{display:flex;align-items:center;gap:.9rem;padding:.68rem 0;border-bottom:1px solid rgba(255,255,255,.09);font-size:.88rem}
.metrics li:last-child{border-bottom:0}
.metrics span{flex:1;color:rgba(243,236,228,.72)}
.metrics b{font-family:var(--display);color:#E4B978;font-size:1rem;font-weight:600;min-width:74px;text-align:end}
.metrics i{font-style:normal;font-size:.68rem;padding:.16rem .55rem;border-radius:999px;
  background:rgba(120,180,120,.16);color:#9AD29A;border:1px solid rgba(120,180,120,.3);white-space:nowrap}

/* ---------- materials ---------- */
.materials{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}
.mat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r-sm);
  padding:1.1rem;transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease
}
.mat:hover{transform:translateY(-4px);box-shadow:var(--sh);border-color:var(--line2)}
.swatch{
  display:block;height:82px;border-radius:10px;background:var(--c);
  box-shadow:inset 0 0 0 1px rgba(0,0,0,.09),0 6px 18px -8px rgba(25,21,18,.4);
  position:relative;overflow:hidden;margin-bottom:.85rem
}
.swatch.wood{background:
  repeating-linear-gradient(96deg,rgba(0,0,0,.06) 0 3px,transparent 3px 11px),
  linear-gradient(160deg,#8a5f3c,#5f4029)}
.swatch.stone{background:
  radial-gradient(120% 80% at 20% 15%,rgba(150,150,145,.28),transparent 60%),
  linear-gradient(150deg,#f2eee8,#ddd5ca)}
.swatch.metal{background:
  linear-gradient(105deg,#8d7043 0%,#d5b57e 34%,#8d7043 58%,#efd9ae 82%,#9a7c4c 100%)}
.mat h4{font-size:.98rem;margin-bottom:.28rem}
.mat p{font-size:.83rem;color:var(--muted);margin-bottom:.55rem}
.mat code{
  font-family:ui-monospace,Menlo,monospace;font-size:.72rem;color:var(--accent);
  background:rgba(192,122,18,.09);padding:.16rem .5rem;border-radius:6px;direction:ltr;display:inline-block
}

/* ---------- lighting ---------- */
.light-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:1rem}
.light{
  background:var(--card);border:1px solid var(--line);border-left:3px solid var(--accent);
  border-radius:var(--r-sm);padding:1.3rem;transition:transform .3s ease,box-shadow .3s ease
}
.light:hover{transform:translateY(-4px);box-shadow:var(--sh)}
.light b{font-family:var(--display);font-size:.72rem;color:var(--accent);letter-spacing:.1em}
.light h4{font-size:1rem;margin:.4rem 0 .45rem}
.light p{font-size:.86rem;color:var(--ink2)}

/* ---------- table ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--card);box-shadow:var(--sh)}
table{width:100%;border-collapse:collapse;font-size:.89rem;min-width:640px}
thead th{
  background:var(--dark);color:#EDE3D6;font-family:var(--display);font-weight:500;font-size:.86rem;
  text-align:start;padding:.95rem 1.2rem;letter-spacing:.02em
}
tbody td{padding:.85rem 1.2rem;border-bottom:1px solid var(--line);vertical-align:top}
tbody tr:nth-child(even){background:rgba(243,236,230,.5)}
tbody tr:last-child td{border-bottom:0}
tbody td:first-child{font-weight:500;color:var(--ink)}
tbody td:nth-child(2){color:var(--accent);font-weight:500}
tbody td:nth-child(3){color:var(--muted);font-size:.84rem}

.callout{
  margin-top:1.4rem;background:linear-gradient(135deg,rgba(192,122,18,.09),rgba(192,122,18,.03));
  border:1px solid rgba(192,122,18,.28);border-radius:var(--r-sm);padding:1.3rem 1.4rem
}
.callout strong{font-family:var(--display);font-size:.95rem;color:var(--accent);display:block;margin-bottom:.45rem}
.callout p{font-size:.9rem;color:var(--ink2)}

/* ---------- footer ---------- */
.foot{background:var(--dark);color:rgba(243,236,228,.7);padding:clamp(2.6rem,5vw,4rem) clamp(1.1rem,4vw,2rem) 2rem;margin-top:clamp(2rem,4vw,3.5rem)}
.foot-grid{max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:2rem}
.foot h4{color:#F3ECE4;font-size:1.02rem;margin-bottom:.7rem}
.foot p{font-size:.87rem;line-height:1.8}
.foot ul li{margin-bottom:.45rem}
.foot a{font-size:.87rem;transition:color .2s ease}
.foot a:hover{color:#E4B978}
.fine{max-width:var(--max);margin:2.4rem auto 0;padding-top:1.4rem;border-top:1px solid rgba(255,255,255,.1);
  font-size:.76rem;color:rgba(243,236,228,.45)}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .plan-grid,.triangle-card,.foot-grid{grid-template-columns:1fr}
  .nav-links{display:none}
  .stat{padding-inline:.2rem 1.1rem}
}
@media(max-width:560px){
  body{font-size:15.5px}
  .viewer-bottom{flex-direction:column;align-items:stretch}
  .seg,.toggles{justify-content:center}
  #viewer{height:clamp(340px,52vh,480px)}
  .stats{grid-template-columns:1fr 1fr}
}