/* ==========================================================================
   Alborz Industrial Group — shared stylesheet (fa + en)
   Concept: the site is a set of construction drawings. A visible 12-column
   hairline grid; every block is a rectangular cell; each branch is a sheet
   with a title block; line drawings resolve into built work on scroll.
   Logical properties (inline-start/end) keep RTL and LTR in one file.
   ========================================================================== */

/* ---------- fonts (self-hosted: Google Fonts is unreliable from Iran) ---------- */
@font-face{font-family:"Vazirmatn";font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/vazirmatn-arabic-400-normal.woff2) format("woff2");unicode-range:U+0600-06FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE80-FEFC}
@font-face{font-family:"Vazirmatn";font-style:normal;font-weight:500;font-display:swap;src:url(../fonts/vazirmatn-arabic-500-normal.woff2) format("woff2");unicode-range:U+0600-06FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE80-FEFC}
@font-face{font-family:"Vazirmatn";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/vazirmatn-arabic-700-normal.woff2) format("woff2");unicode-range:U+0600-06FF,U+200C-200E,U+2010-2011,U+204F,U+2E41,U+FB50-FDFF,U+FE80-FEFC}
@font-face{font-family:"Vazirmatn";font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/vazirmatn-latin-400-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Vazirmatn";font-style:normal;font-weight:500;font-display:swap;src:url(../fonts/vazirmatn-latin-500-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Vazirmatn";font-style:normal;font-weight:700;font-display:swap;src:url(../fonts/vazirmatn-latin-700-normal.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url(../fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url(../fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2")}

/* ---------- tokens ---------- */
:root{
  --paper:#F1EEE6; --paper-2:#E8E4DA; --ink:#0F1C2E; --ink-2:#55606F; --rule:rgba(15,28,46,.17);
  --steel:#566A7D; --oak:#A87A4C; --navy:#15294A; --gold:#A8823F; --on-block:#F4F1EA;
  --sans:"Vazirmatn", Tahoma, system-ui, sans-serif;
  --mono:"IBM Plex Mono", "Vazirmatn", ui-monospace, monospace;
  --pad:clamp(16px,2.2vw,30px);
  --gap:clamp(40px,7vw,96px);
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#0C1624; --paper-2:#111E30; --ink:#E8E3D6; --ink-2:#97A2B2; --rule:rgba(232,227,214,.14);
  --steel:#4A5F74; --oak:#8C6640; --navy:#21406E; --gold:#C9A462; --on-block:#F4F1EA; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0C1624; --paper-2:#111E30; --ink:#E8E3D6; --ink-2:#97A2B2; --rule:rgba(232,227,214,.14);
  --steel:#4A5F74; --oak:#8C6640; --navy:#21406E; --gold:#C9A462; --on-block:#F4F1EA; color-scheme:dark}

/* ---------- base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:72px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));
  padding-block:0 32px;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--paper)}
html[lang="en"] body{line-height:1.6}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{text-wrap:balance}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;line-height:1.5}
.muted{color:var(--ink-2)}
.ltr{direction:ltr;unicode-bidi:isolate;display:inline-block}
.skip{position:absolute;inset-inline-start:16px;top:-60px;background:var(--ink);color:var(--paper);padding:8px 14px;z-index:20}
.skip:focus{top:8px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- grid ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));border-inline-start:1px solid var(--rule);border-block-start:1px solid var(--rule)}
.cell{border-inline-end:1px solid var(--rule);border-block-end:1px solid var(--rule);padding:var(--pad);min-width:0}
.s2{grid-column:span 2}.s3{grid-column:span 3}.s4{grid-column:span 4}.s5{grid-column:span 5}.s6{grid-column:span 6}
.s7{grid-column:span 7}.s8{grid-column:span 8}.s9{grid-column:span 9}.s12{grid-column:span 12}
.gap{height:var(--gap);border-inline:1px solid var(--rule)}
.eyebrow{display:flex;flex-direction:column;gap:6px}
.eyebrow.row{flex-direction:row;justify-content:space-between;flex-wrap:wrap}

/* ---------- header ---------- */
.site-header{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--paper);border-block-start:0}
.site-header .cell{padding-block:12px;display:flex;align-items:center;gap:20px}
.brand{gap:10px!important;font-weight:700;font-size:16px;white-space:nowrap}
.brand img{width:30px;height:30px;flex:none;object-fit:contain}
.site-nav{overflow-x:auto;scrollbar-width:none}
.site-nav::-webkit-scrollbar{display:none}
.site-nav a{white-space:nowrap;font-size:15px;position:relative;padding-block:2px;color:var(--ink-2)}
.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--ink)}
.site-nav a::after{content:"";position:absolute;inset-inline:0;bottom:-2px;height:1px;background:var(--ink);transform:scaleX(0);transition:transform .3s}
.site-nav a:hover::after,.site-nav a[aria-current="page"]::after{transform:scaleX(1)}
.clocks{justify-content:space-between}
.clocks b{font-weight:500;color:var(--ink)}
.lang{justify-content:center;background:var(--ink);color:var(--paper);font-family:var(--sans)!important;font-size:14px}
.lang:hover{background:var(--gold);color:var(--ink)}

/* ---------- buttons ---------- */
.btn{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:14px 16px;border:1px solid var(--ink);font-weight:500;transition:background .25s,color .25s}
.btn:hover{background:var(--ink);color:var(--paper)}
.btn.solid{background:var(--ink);color:var(--paper)}
.btn.solid:hover{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.btns{display:grid;gap:8px}
.arrow{display:inline-block;transition:transform .3s}
html[dir="rtl"] .btn:hover .arrow,html[dir="rtl"] a:hover>.arrow{transform:translateX(-6px)}
html[dir="ltr"] .btn:hover .arrow,html[dir="ltr"] a:hover>.arrow{transform:translateX(6px)}

/* ---------- hero (home) ---------- */
.h-word{display:flex;flex-direction:column;justify-content:space-between;gap:24px;padding-block:clamp(20px,3vw,40px) var(--pad)}
.h-word .row{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.wordmark{font-weight:500;font-size:clamp(108px,19vw,300px);line-height:.9;letter-spacing:-.01em;margin:0}
html[lang="en"] .wordmark{font-size:clamp(76px,13.5vw,214px);letter-spacing:-.035em;line-height:.85}
.h-map{grid-row:span 2;position:relative;padding:0;min-height:360px;overflow:hidden;background:var(--paper-2)}
.h-map canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.h-map .tag{position:absolute;padding:10px 12px;background:var(--paper-2)}
.h-map .tl{top:0;inset-inline-start:0;border-inline-end:1px solid var(--rule);border-block-end:1px solid var(--rule)}
.h-map .br{bottom:0;inset-inline-end:0;border-inline-start:1px solid var(--rule);border-block-start:1px solid var(--rule)}
.h-thesis h1{font-size:clamp(30px,3.4vw,50px);line-height:1.15;font-weight:700;margin:0 0 14px}
.h-thesis p{margin:0;max-width:38ch;color:var(--ink-2)}
.tb{display:grid;grid-template-columns:1fr 1fr;padding:0}
.tb>div{padding:14px var(--pad);border-block-end:1px solid var(--rule);display:flex;flex-direction:column;gap:2px;min-width:0}
.tb>div:nth-child(odd){border-inline-end:1px solid var(--rule)}
.tb>div:nth-last-child(-n+2){border-block-end:0}
.tb strong{font-size:clamp(22px,2.3vw,32px);font-weight:500;line-height:1.25}
.branch{color:var(--on-block);display:flex;flex-direction:column;justify-content:space-between;gap:36px;min-height:230px;transition:padding .35s}
.branch h2{font-size:clamp(28px,2.8vw,40px);margin:0;font-weight:700;line-height:1.1}
.branch p{margin:6px 0 0;opacity:.88;max-width:32ch;font-size:15px}
.branch .top,.branch .bot{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.branch .bot{align-items:flex-end}
.branch .arrow{font-size:26px;line-height:1}
.branch:hover{padding-block-start:calc(var(--pad) + 6px)}
.metal-bg{background:var(--steel)}.wood-bg{background:var(--oak)}.inv-bg{background:var(--navy)}
.metal-p{--br:var(--steel)}.wood-p{--br:var(--oak)}.inv-p{--br:var(--navy)}

/* ---------- about ---------- */
.lead{font-size:clamp(21px,2.4vw,34px);line-height:1.6;font-weight:400;margin:0;max-width:32em;text-wrap:pretty}
html[lang="en"] .lead{line-height:1.4}
.lead em{font-style:normal;color:var(--gold)}
.prose{max-width:62ch;color:var(--ink-2);margin:20px 0 0}
.prose p{margin:0 0 1em}
.photo-cell{padding:0;position:relative;min-height:280px;overflow:hidden;background:var(--paper-2)}
.photo-cell img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.photo-cell .tag{position:absolute;bottom:0;inset-inline-start:0;padding:8px 12px;background:var(--paper);border-inline-end:1px solid var(--rule);border-block-start:1px solid var(--rule)}
.quote{display:flex;flex-direction:column;justify-content:space-between;gap:28px;background:var(--navy);color:var(--on-block)}
.quote blockquote{margin:0;font-size:clamp(22px,2.4vw,34px);line-height:1.55;font-weight:500;max-width:30em}
html[lang="en"] .quote blockquote{line-height:1.35}
.quote .mono{opacity:.75}

/* ---------- sheets ---------- */
.s-num{display:flex;flex-direction:column;justify-content:space-between;gap:24px;color:var(--on-block)}
.s-num .big{font-family:var(--mono);font-size:clamp(34px,4vw,60px);font-weight:500;line-height:1;letter-spacing:-.02em;direction:ltr;text-align:start}
.s-title h1,.s-title h2{font-size:clamp(32px,3.8vw,58px);margin:4px 0 0;line-height:1.1;font-weight:700}
.s-title p{margin:12px 0 0;color:var(--ink-2);max-width:48ch}
.s-tb{padding:0;display:grid;grid-template-columns:1fr 1fr}
.s-tb>div{padding:12px 16px;border-block-end:1px solid var(--rule);display:flex;flex-direction:column;gap:2px;min-width:0}
.s-tb>div:nth-child(odd){border-inline-end:1px solid var(--rule)}
.s-tb>div:nth-last-child(-n+2){border-block-end:0}
.s-tb span:last-child{font-size:14px}
.s-list{display:flex;flex-direction:column;justify-content:space-between;gap:32px}
.s-list ul{list-style:none;margin:0;padding:0;border-block-start:1px solid var(--rule)}
.s-list li{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-block-end:1px solid var(--rule);font-size:16px}
.s-list li span{color:var(--ink-2)}
.flip .s-list{order:2}

/* ---------- drawing panel ---------- */
.panel{padding:0;position:relative;display:flex;flex-direction:column}
.panel .bar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;border-block-end:1px solid var(--rule)}
.toggle{display:flex;border:1px solid var(--rule)}
.toggle button{font:inherit;font-size:13px;background:transparent;color:var(--ink-2);border:0;padding:5px 14px;cursor:pointer}
.toggle button+button{border-inline-start:1px solid var(--rule)}
.toggle button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.stage{position:relative;aspect-ratio:600/440;max-width:100%;overflow:hidden;
  background-image:linear-gradient(var(--rule) 1px,transparent 1px),linear-gradient(90deg,var(--rule) 1px,transparent 1px);
  background-size:24px 24px;background-position:-1px -1px}
.stage svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.stage .build{position:absolute;inset:0;background:color-mix(in srgb,var(--br) 22%,var(--paper));clip-path:inset(0 0 0 100%);transition:clip-path 1.3s cubic-bezier(.7,0,.2,1)}
html[dir="ltr"] .stage .build{clip-path:inset(0 100% 0 0)}
.panel[data-state="built"] .build,html[dir="ltr"] .panel[data-state="built"] .build{clip-path:inset(0 0 0 0)}
.build>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.build .photo{position:absolute;inset-inline-start:12px;top:12px;padding:6px 10px;background:var(--paper);border:1px solid var(--rule);z-index:1}

svg .l>*{fill:none;stroke:var(--ink);stroke-width:1.5;vector-effect:non-scaling-stroke}
svg .dim>*{fill:none;stroke:var(--ink-2);stroke-width:1;vector-effect:non-scaling-stroke}
svg .d>*{fill:none;stroke:var(--ink-2);stroke-width:1;stroke-dasharray:6 5;vector-effect:non-scaling-stroke}
svg .d>.pl{stroke-dasharray:14 4 2 4;stroke:var(--gold);stroke-width:1.3}
svg text{font-family:var(--mono);font-size:12px;fill:var(--ink-2);letter-spacing:.04em}
svg text.lbl{font-family:var(--sans);font-size:22px;font-weight:700;fill:var(--ink)}
.draw .f{display:none}
.as-built .f>*{stroke:none}
.as-built .fs{fill:var(--br)}
.as-built .fl{fill:color-mix(in srgb,var(--br) 45%,var(--paper))}
.as-built .fd{fill:color-mix(in srgb,var(--br) 60%,#000)}
.as-built .l>*{stroke:color-mix(in srgb,var(--br) 50%,#000);stroke-width:1}
.as-built .d,.as-built .dim,.as-built text:not(.lbl){opacity:.45}
.as-built text.lbl{fill:var(--on-block)}

.anim .draw .l>*{vector-effect:none;stroke-width:1.2;stroke-dasharray:1;stroke-dashoffset:0;transition:stroke-dashoffset 1.5s cubic-bezier(.6,0,.2,1)}
.anim.pending .draw .l>*{stroke-dashoffset:1}
.anim .draw .d,.anim .draw .dim,.anim .draw text{transition:opacity .8s 1.2s}
.anim.pending .draw .d,.anim.pending .draw .dim,.anim.pending .draw text{opacity:0}

/* ---------- services ---------- */
.svc{display:flex;flex-direction:column;gap:10px;min-height:220px}
.svc .code{display:flex;justify-content:space-between}
.svc h3{font-size:clamp(20px,1.8vw,26px);margin:28px 0 0;line-height:1.25;font-weight:700}
.svc p{margin:0;color:var(--ink-2);font-size:15px}

/* ---------- tables (revisions, project schedule) ---------- */
.table-wrap{overflow-x:auto;padding:0}
.sched{width:100%;border-collapse:collapse;min-width:520px}
.sched th,.sched td{text-align:start;padding:14px var(--pad);border-block-end:1px solid var(--rule);vertical-align:top}
.sched th{font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.08em;color:var(--ink-2)}
.sched td.code{font-family:var(--mono);width:5em;direction:ltr;text-align:start}
.sched td.yr{white-space:nowrap;font-weight:500;width:7em}
.sched td.kind{white-space:nowrap;width:9em;color:var(--ink-2)}
.sched td b{font-weight:700;display:block}
.sched td span.desc{color:var(--ink-2)}
.sched tr:last-child td{border-block-end:0}

/* ---------- photo grid / gallery ---------- */
.filters{display:flex;flex-wrap:wrap;gap:0;padding:0}
.filters button{font:inherit;font-size:14px;background:transparent;color:var(--ink-2);border:0;border-inline-end:1px solid var(--rule);padding:14px var(--pad);cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.shot{padding:0;position:relative;overflow:hidden;margin:0;background:var(--paper-2)}
.shot button{all:unset;display:block;cursor:zoom-in;width:100%}
.shot button:focus-visible{outline:2px solid var(--gold);outline-offset:-4px}
.shot .ph{display:block;aspect-ratio:1/1;overflow:hidden}
.shot img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.shot:hover img{transform:scale(1.035)}
.shot figcaption{display:flex;justify-content:space-between;gap:10px;padding:12px 14px;border-block-start:1px solid var(--rule);background:var(--paper)}
.shot figcaption b{font-weight:500;font-size:14px}
.shot[hidden]{display:none!important}

dialog.lightbox{border:1px solid var(--rule);padding:0;background:var(--paper);color:var(--ink);max-width:min(1100px,94vw);width:100%}
dialog.lightbox::backdrop{background:rgba(8,14,24,.82)}
.lightbox .lb-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;border-block-end:1px solid var(--rule)}
.lightbox .lb-bar button{font:inherit;background:transparent;border:1px solid var(--rule);color:var(--ink);padding:4px 12px;cursor:pointer}
.lightbox img{max-height:78vh;width:100%;object-fit:contain;background:var(--paper-2)}
.lightbox .lb-nav{display:flex;border-block-start:1px solid var(--rule)}
.lightbox .lb-nav button{flex:1;font:inherit;background:transparent;border:0;color:var(--ink);padding:12px;cursor:pointer}
.lightbox .lb-nav button+button{border-inline-start:1px solid var(--rule)}

/* ---------- offices ---------- */
.office{display:grid;grid-template-columns:minmax(0,1fr) 120px;gap:20px 24px;align-items:start}
.office h3{font-size:clamp(34px,4vw,58px);margin:0;line-height:1.05;font-weight:700}
.office dl{grid-column:1 / -1;margin:0;display:grid;grid-template-columns:auto 1fr;border-block-start:1px solid var(--rule)}
.office dt,.office dd{margin:0;padding:10px 0;border-block-end:1px solid var(--rule)}
.office dt{padding-inline-end:24px}
.office dd a{border-block-end:1px solid var(--gold)}
.office .x{width:120px;height:120px}
.office .x *{fill:none;stroke:var(--ink-2);stroke-width:1}
.office .x .c{stroke:var(--gold);stroke-width:1.5}
.office .btn{grid-column:1 / -1}

/* ---------- footer / legend ---------- */
.site-footer{margin-top:var(--gap)}
.legend{display:flex;flex-wrap:wrap;gap:12px 32px;align-items:center}
.legend span{display:inline-flex;align-items:center;gap:10px}
.legend i{display:inline-block;width:40px;height:0;border-top:1.5px solid var(--ink)}
.legend i.dash{border-top:1px dashed var(--ink-2)}
.legend i.pl{border-top:1.5px dashed var(--gold)}
.legend i.cr{width:14px;height:14px;border:1.5px solid var(--gold);border-radius:50%}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 24px}
.foot-links a:hover{color:var(--ink)}
.foot-logo{display:flex;align-items:center;justify-content:center}
.foot-logo img{width:150px;height:auto}
.logo-dark{display:none}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .logo-light{display:none}:root:not([data-theme="light"]) .logo-dark{display:block}}
:root[data-theme="dark"] .logo-light{display:none}:root[data-theme="dark"] .logo-dark{display:block}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .clocks{display:none!important}
  .site-header .site-nav{grid-column:span 7}
  .h-word{grid-column:span 12}.h-map{grid-column:span 12;grid-row:auto;min-height:300px}
  .h-thesis{grid-column:span 7}.tb{grid-column:span 5}
  .s-num{grid-column:span 3}.s-title{grid-column:span 9}.s-tb{grid-column:span 12}
  .s-list{grid-column:span 12;order:2}.panel{grid-column:span 12}
  .r-full{grid-column:span 12}
  .r-half{grid-column:span 6}
  .shot{grid-column:span 6}
  .svc{grid-column:span 6}
}
@media (max-width:640px){
  .site-header .brand{grid-column:span 12;border-block-end:1px solid var(--rule)}
  .site-header .site-nav{grid-column:span 9}.site-header .lang{grid-column:span 3}
  .h-thesis,.tb{grid-column:span 12}
  .branch{grid-column:span 12;min-height:170px}
  .s-num{grid-column:span 12;flex-direction:row;align-items:flex-end}
  .s-title{grid-column:span 12}
  .r-half,.shot,.svc{grid-column:span 12}
  .svc{min-height:0}
  .office{grid-template-columns:1fr}.office .x{display:none}
  .filters button{flex:1 1 50%;border-block-end:1px solid var(--rule)}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none!important;animation:none!important}
}
@media print{
  .site-header,.toggle,.filters{display:none}
  .stage .build{clip-path:none!important}
}

/* ==========================================================================
   MOTION & LIFE
   Everything below is an enhancement. html.js is set by an inline script;
   reveal states are only applied by script.js to content below the fold.
   ========================================================================== */
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth [data-lenis-prevent]{overscroll-behavior:contain}
.lenis.lenis-stopped{overflow:clip}

/* ---------- terrain (home hero) ---------- */
.h-map{cursor:grab;touch-action:pan-y}
.h-map.dragging{cursor:grabbing}
.h-map .tr{top:0;inset-inline-end:0;padding:0;border:0;border-inline-start:1px solid var(--rule);border-block-end:1px solid var(--rule);background:var(--paper-2)}
.h-map .tr button{padding:9px 14px}
.h-map .bl{bottom:0;inset-inline-start:0;border-inline-end:1px solid var(--rule);border-block-start:1px solid var(--rule);font-variant-numeric:tabular-nums}
.h-map .peak{position:absolute;left:0;top:0;transform:translate(-50%,-100%);padding:4px 8px;background:var(--ink);color:var(--paper);white-space:nowrap;pointer-events:none;opacity:0;transition:opacity .6s;z-index:1}
.h-map .peak::after{content:"";position:absolute;left:50%;top:100%;width:1px;height:28px;background:var(--gold)}
.h-map.ready .peak{opacity:1}
.h-map .peak b{font-weight:500;font-family:var(--sans)}

/* ---------- header progress (the sheet being read) ---------- */
.site-header{--p:0}
.site-header::after{content:"";position:absolute;inset-inline-start:0;bottom:-1px;height:2px;width:calc(var(--p) * 100%);background:var(--gold);pointer-events:none}

/* ---------- ticker ---------- */
.ticker{overflow:hidden;border-inline:1px solid var(--rule);border-block-end:1px solid var(--rule);padding-block:18px;white-space:nowrap;
  margin-bottom:var(--gap);font-size:clamp(18px,1.8vw,24px);font-weight:500;color:var(--ink)}
.ticker-track{display:inline-flex;gap:0;will-change:transform}
.ticker-track span{padding-inline-end:.6em}
.ticker:hover{color:var(--gold)}

/* ---------- dimension lines in the gaps ---------- */
.gap{position:relative;display:flex;align-items:center;padding-inline:var(--pad)}
.dimline{display:flex;align-items:center;gap:12px;width:100%;color:var(--ink-2)}
.dimline i{flex:1;height:1px;background:var(--rule);position:relative;transform-origin:center;transform:scaleX(var(--d,1));transition:transform 1.2s cubic-bezier(.7,0,.2,1)}
.dimline i:first-child::before,.dimline i:last-child::after{content:"";position:absolute;top:-6px;width:1px;height:13px;background:var(--ink-2);transform:rotate(45deg)}
.dimline i:first-child::before{inset-inline-start:0}
.dimline i:last-child::after{inset-inline-end:0}
.dimline b{font-weight:400;font-size:11px;letter-spacing:.1em;white-space:nowrap}
.dimline b:empty{display:none}
.gap.rv .dimline i{--d:0}

/* ---------- hero intro (CSS only; runs once on load) ---------- */
@keyframes rise{from{transform:translateY(28px);opacity:0}to{transform:none;opacity:1}}
@keyframes mask-up{from{clip-path:inset(100% 0 0 0);transform:translateY(12%)}to{clip-path:inset(-10% 0 -10% 0);transform:none}}
@keyframes rule-in{from{transform:scaleX(0)}to{transform:scaleX(1)}}
html.js .wordmark{animation:mask-up 1.3s cubic-bezier(.7,0,.2,1) .15s both}
html.js .h-word .row,html.js .h-thesis>*,html.js .tb>div,html.js .branch>*{animation:rise .9s cubic-bezier(.2,.7,.2,1) both}
html.js .h-word .row:first-child{animation-delay:.1s}html.js .h-word .row:last-child{animation-delay:.55s}
html.js .h-thesis h1{animation-delay:.45s}html.js .h-thesis p{animation-delay:.6s}
html.js .tb>div:nth-child(1){animation-delay:.6s}html.js .tb>div:nth-child(2){animation-delay:.7s}
html.js .tb>div:nth-child(3){animation-delay:.8s}html.js .tb>div:nth-child(4){animation-delay:.9s}
html.js .branch:nth-of-type(1)>*{animation-delay:.8s}html.js .branch:nth-of-type(2)>*{animation-delay:.92s}html.js .branch:nth-of-type(3)>*{animation-delay:1.04s}
html.js .s-title>*,html.js .s-tb>div{animation:rise .9s cubic-bezier(.2,.7,.2,1) both}
html.js .s-title>*:nth-child(2){animation-delay:.12s}html.js .s-title>*:nth-child(3){animation-delay:.24s}
html.js .s-tb>div:nth-child(2){animation-delay:.1s}html.js .s-tb>div:nth-child(3){animation-delay:.2s}html.js .s-tb>div:nth-child(4){animation-delay:.3s}
html.js .s-num .big{animation:mask-up 1s cubic-bezier(.7,0,.2,1) .1s both}

/* ---------- scroll reveals (state set by script.js below the fold only) ---------- */
.rv-cell{transition:opacity .9s cubic-bezier(.2,.7,.2,1),transform .9s cubic-bezier(.2,.7,.2,1);transition-delay:var(--dl,0ms)}
.rv-cell.rv{opacity:0;transform:translateY(32px)}
.shot.rv-cell .ph{transition:clip-path 1.1s cubic-bezier(.7,0,.2,1);transition-delay:var(--dl,0ms)}
.shot.rv-cell.rv{transform:none;opacity:1}
.shot.rv-cell.rv .ph{clip-path:inset(0 0 100% 0)}
.photo-cell img,.build>img{will-change:transform}

/* quote words */
[data-words] .w{display:inline-block;transition:opacity .6s,transform .6s cubic-bezier(.2,.7,.2,1),filter .6s;transition-delay:var(--dl,0ms)}
[data-words].rv .w{opacity:.08;transform:translateY(.25em);filter:blur(4px)}

/* ---------- drafting crosshair (fine pointers only) ---------- */
.xh{position:fixed;inset:0;pointer-events:none;z-index:30;opacity:0;transition:opacity .3s}
.xh.on{opacity:1}
.xh i{position:absolute;background:var(--gold);opacity:.35}
.xh .h{left:0;right:0;height:1px;top:0}
.xh .v{top:0;bottom:0;width:1px;left:0}
.xh b{position:absolute;left:0;top:0;font:500 10px/1 var(--mono);letter-spacing:.06em;color:var(--ink);background:var(--paper);border:1px solid var(--rule);padding:4px 6px;white-space:nowrap;font-variant-numeric:tabular-nums}
@media (hover:none),(pointer:coarse){.xh{display:none}}

/* branch blocks: hatch sweeps in on hover */
.branch{position:relative;overflow:hidden;isolation:isolate}
.branch::before{content:"";position:absolute;inset:0;z-index:-1;opacity:0;transition:opacity .5s;
  background:repeating-linear-gradient(45deg,rgba(255,255,255,.09) 0 1px,transparent 1px 9px);background-size:200% 200%;animation:hatch 6s linear infinite paused}
.branch:hover::before{opacity:1;animation-play-state:running}
@keyframes hatch{to{background-position:100% 100%}}

/* magnetic buttons */
.btn{will-change:transform}

@media (prefers-reduced-motion:reduce){
  html.js .wordmark,html.js .h-word .row,html.js .h-thesis>*,html.js .tb>div,html.js .branch>*,html.js .s-title>*,html.js .s-tb>div,html.js .s-num .big{animation:none!important}
  .rv-cell.rv,[data-words].rv .w{opacity:1!important;transform:none!important;filter:none!important}
  .shot.rv-cell.rv .ph{clip-path:none!important}
  .xh{display:none}
}
.h-map .peak span{text-transform:none}
@media (max-width:1000px){.h-map{min-height:min(420px,95vw)}}

/* ---------- 3D models inside the drawing panels ---------- */
.panel .bar{flex-wrap:wrap}
.bar-hint{display:none}
.panel[data-state="model"] .bar-label{display:none}
.panel[data-state="model"] .bar-hint{display:inline}
.explode{font:inherit;font-size:13px;background:transparent;color:var(--ink);border:1px solid var(--ink);padding:5px 12px;cursor:pointer;margin-inline-start:auto;display:none}
.explode[aria-pressed="true"]{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.panel[data-state="model"] .explode{display:inline-block}
.stage .model{position:absolute;inset:0;width:100%;height:100%;display:block;opacity:0;pointer-events:none;transition:opacity .35s;touch-action:pan-y;cursor:grab}
.stage .model.dragging{cursor:grabbing}
.panel[data-state="model"] .model{opacity:1;pointer-events:auto}
.stage .draw{transition:opacity .45s .1s}
.panel[data-state="model"] .draw{opacity:0}
@media (prefers-reduced-motion:reduce){.stage .draw,.stage .model{transition:none}}

/* ---------- 3D only (drawing SVG stays as the no-JS fallback) ---------- */
.panel .explode{display:inline-block}
.panel.has-model .draw{display:none}
.panel.has-model .model{opacity:1;pointer-events:auto}
.explode{position:relative}
.explode.nudge{animation:nudge 1.6s cubic-bezier(.2,.7,.2,1) 2}
@keyframes nudge{0%,100%{box-shadow:0 0 0 0 color-mix(in srgb,var(--gold) 70%,transparent)}50%{box-shadow:0 0 0 7px color-mix(in srgb,var(--gold) 0%,transparent)}}