/* ==========================================================================
   STARR TRUSS AND LUMBER INC.
   starr.css  —  drawing-sheet design system
   Palette: ink / paper / rule / graphite / mist  + signal orange, blueprint blue
   Type:    Archivo (display) · IBM Plex Sans (body) · IBM Plex Mono (data)
   ========================================================================== */

/* ---------------------------------------------------------------- tokens */
:root{
  --ink:#0B0B0C;
  --paper:#FFFFFF;
  --rule:#D8DADE;
  --graphite:#6A6E75;
  --mist:#F3F4F6;
  --signal:#FF4A00;      /* construction side */
  --blueprint:#1B39FF;   /* technology side  */
  --accent:var(--signal);

  --display:"Archivo","Helvetica Neue",Arial,sans-serif;
  --body:"IBM Plex Sans","Segoe UI",Helvetica,Arial,sans-serif;
  --data:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Consolas,monospace;

  --shell:1280px;
  --gut:clamp(20px,4vw,64px);
  --hair:1px solid var(--rule);
}

/* per-page accent flip: technology sheets run blueprint blue */
body[data-accent="blueprint"]{--accent:var(--blueprint);}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;}}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body);
  font-size:17px;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,svg{max-width:100%;display:block;}
a{color:inherit;}

/* the sheet frame: a hairline border that sits over the whole page,
   the way a title-block border sits on a shop drawing */
.sheetframe{
  position:fixed;inset:14px;border:var(--hair);
  pointer-events:none;z-index:60;
}
.sheetframe::before,.sheetframe::after{
  content:"";position:absolute;width:13px;height:13px;
  border:2px solid var(--ink);
}
.sheetframe::before{top:-1px;left:-1px;border-right:0;border-bottom:0;}
.sheetframe::after{bottom:-1px;right:-1px;border-left:0;border-top:0;}
@media (max-width:900px){.sheetframe{display:none;}}

/* ------------------------------------------------------------ typography */
h1,h2,h3,h4{
  font-family:var(--display);
  font-weight:800;
  line-height:0.94;
  letter-spacing:-0.025em;
  text-transform:uppercase;
  margin:0 0 .5em;
}
h1{font-size:clamp(2.9rem,7.4vw,6.4rem);}
h2{font-size:clamp(2rem,4.4vw,3.6rem);}
h3{font-size:clamp(1.15rem,1.7vw,1.5rem);letter-spacing:-0.01em;}
h4{font-size:1rem;letter-spacing:.02em;}
p{margin:0 0 1.1em;max-width:66ch;}
p:last-child{margin-bottom:0;}
strong{font-weight:600;}

.eyebrow{
  font-family:var(--data);
  font-size:.72rem;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--graphite);
  margin:0 0 1.4rem;
  display:flex;align-items:center;gap:.7rem;
}
.eyebrow::before{
  content:"";width:26px;height:2px;background:var(--accent);flex:none;
}
.lede{font-size:clamp(1.08rem,1.5vw,1.32rem);line-height:1.5;max-width:60ch;color:#2B2E33;}
.kicker{font-family:var(--data);font-size:.74rem;letter-spacing:.2em;text-transform:uppercase;color:var(--graphite);}

/* ---------------------------------------------------------------- layout */
.shell{max-width:var(--shell);margin:0 auto;padding-inline:var(--gut);}
.band{padding-block:clamp(64px,9vw,124px);}
.band--mist{background:var(--mist);}
.band--ink{background:var(--ink);color:#F5F5F6;}
.band--ink .lede{color:#B9BCC2;}
.band--ink .eyebrow{color:#8A8E96;}
.band--tight{padding-block:clamp(44px,6vw,76px);}

.split{display:grid;gap:clamp(28px,4vw,64px);grid-template-columns:minmax(0,1fr);}
@media (min-width:900px){
  .split{grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:start;}
  .split--even{grid-template-columns:repeat(2,minmax(0,1fr));}
  .split--flip>*:first-child{order:2;}
}

/* dimension-line divider — the section rule, drawn like a drawing callout */
.dim{
  display:flex;align-items:center;gap:1rem;
  margin:clamp(48px,6vw,84px) 0 clamp(28px,3vw,44px);
  color:var(--graphite);
}
.dim::before,.dim::after{content:"";height:1px;background:var(--rule);flex:1;}
.dim__label{
  font-family:var(--data);font-size:.72rem;letter-spacing:.22em;
  text-transform:uppercase;white-space:nowrap;
}
.dim__label b{color:var(--accent);font-weight:500;}

/* -------------------------------------------------------------- masthead */
.masthead{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:var(--hair);
}
.masthead__in{
  max-width:var(--shell);margin:0 auto;padding:0 var(--gut);
  height:74px;display:flex;align-items:center;gap:clamp(16px,3vw,44px);
}
.mark{display:flex;align-items:center;gap:.65rem;text-decoration:none;flex:none;}
.mark svg{width:34px;height:26px;}
.mark__name{
  font-family:var(--display);font-weight:800;text-transform:uppercase;
  letter-spacing:-0.02em;font-size:1.02rem;line-height:1;
}
.mark__name span{display:block;font-family:var(--data);font-weight:400;
  font-size:.56rem;letter-spacing:.22em;color:var(--graphite);margin-top:3px;}

.nav{display:flex;gap:clamp(10px,1.8vw,26px);margin-left:auto;}
.nav a{
  font-family:var(--data);font-size:.76rem;letter-spacing:.1em;
  text-transform:uppercase;text-decoration:none;color:var(--graphite);
  padding:6px 0;position:relative;white-space:nowrap;
}
.nav a sup{font-size:.6em;color:var(--rule);margin-right:3px;}
.nav a:hover{color:var(--ink);}
.nav a[aria-current="page"]{color:var(--ink);}
.nav a[aria-current="page"]::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--accent);
}
.masthead .btn{margin-left:clamp(10px,2vw,24px);}
.navtoggle{display:none;}

@media (max-width:1040px){
  .masthead .btn--nav{display:none;}
}
@media (max-width:880px){
  .nav{
    position:fixed;inset:74px 0 auto;background:var(--paper);
    border-bottom:var(--hair);flex-direction:column;gap:0;padding:8px var(--gut) 22px;
    transform:translateY(-120%);transition:transform .32s cubic-bezier(.4,0,.2,1);
  }
  .nav[data-open="true"]{transform:translateY(0);}
  .nav a{padding:14px 0;border-bottom:var(--hair);font-size:.92rem;}
  .navtoggle{
    display:flex;flex-direction:column;justify-content:center;gap:5px;
    margin-left:auto;width:42px;height:42px;background:none;border:var(--hair);
    cursor:pointer;padding:0 10px;
  }
  .navtoggle i{display:block;height:2px;background:var(--ink);transition:transform .25s;}
}

/* --------------------------------------------------------------- buttons */
.btn{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--data);font-size:.76rem;letter-spacing:.13em;text-transform:uppercase;
  text-decoration:none;padding:13px 20px;border:1.5px solid var(--ink);
  background:var(--paper);color:var(--ink);cursor:pointer;
  transition:background .18s,color .18s,border-color .18s,transform .18s;
}
.btn:hover{background:var(--ink);color:var(--paper);transform:translateY(-1px);}
.btn--solid{background:var(--ink);color:var(--paper);}
.btn--solid:hover{background:var(--accent);border-color:var(--accent);color:var(--paper);}
.btn--accent{background:var(--accent);border-color:var(--accent);color:#fff;}
.btn--accent:hover{background:var(--ink);border-color:var(--ink);}
.btn--ghost{border-color:var(--rule);color:var(--graphite);}
.btn--ghost:hover{border-color:var(--ink);}
.band--ink .btn{background:transparent;color:#fff;border-color:#3A3D44;}
.band--ink .btn:hover{background:#fff;color:var(--ink);border-color:#fff;}
.btnrow{display:flex;flex-wrap:wrap;gap:12px;margin-top:2rem;}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;}

/* ------------------------------------------------------------------ hero */
.hero{position:relative;border-bottom:var(--hair);overflow:hidden;}
.hero__in{
  max-width:var(--shell);margin:0 auto;padding:clamp(48px,7vw,88px) var(--gut) 0;
  display:grid;gap:clamp(24px,4vw,48px);
}
@media (min-width:1000px){
  .hero__in{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;
    padding-bottom:clamp(24px,3vw,40px);}
}
.hero h1 em{font-style:normal;color:var(--signal);}
.hero h1 i{font-style:normal;color:var(--blueprint);}
.hero__meta{
  display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:2.2rem;padding-top:1.1rem;
  border-top:var(--hair);font-family:var(--data);font-size:.7rem;
  letter-spacing:.18em;text-transform:uppercase;color:var(--graphite);
}
.hero__art{position:relative;}

/* the truss drawing — the signature element */
.truss{width:100%;height:auto;overflow:visible;}
.truss .member{fill:none;stroke:var(--ink);stroke-width:3;stroke-linecap:square;}
.truss .web{stroke-width:2;}
.truss .plate{fill:var(--paper);stroke:var(--ink);stroke-width:2;}
.truss .dimline{stroke:var(--graphite);stroke-width:1;}
.truss .load{stroke:var(--signal);stroke-width:2.5;}
.truss .loadhead{fill:var(--signal);}
.truss .note{font-family:var(--data);font-size:13px;letter-spacing:.14em;fill:var(--graphite);text-transform:uppercase;}
.truss .joint{font-family:var(--data);font-size:12px;fill:var(--ink);font-weight:500;}
.truss .callout{fill:var(--paper);stroke:var(--accent);stroke-width:1.5;}

.truss--draw .member,.truss--draw .web,.truss--draw .dimline{
  stroke-dasharray:var(--len,1400);stroke-dashoffset:var(--len,1400);
  animation:draw 1.5s cubic-bezier(.5,0,.2,1) forwards;
}
.truss--draw .web{animation-delay:.55s;}
.truss--draw .dimline{animation-delay:1s;animation-duration:.7s;}
.truss--draw .plate,.truss--draw .callout,.truss--draw .joint,
.truss--draw .note,.truss--draw .load,.truss--draw .loadhead{
  opacity:0;animation:fade .5s ease forwards;animation-delay:1.25s;
}
@keyframes draw{to{stroke-dashoffset:0;}}
@keyframes fade{to{opacity:1;}}
@media (prefers-reduced-motion:reduce){
  .truss--draw .member,.truss--draw .web,.truss--draw .dimline{stroke-dashoffset:0;animation:none;}
  .truss--draw .plate,.truss--draw .callout,.truss--draw .joint,
  .truss--draw .note,.truss--draw .load,.truss--draw .loadhead{opacity:1;animation:none;}
}

/* ------------------------------------------------------------ page intro */
.pagehead{border-bottom:var(--hair);padding-block:clamp(46px,6vw,86px);}
.pagehead h1{font-size:clamp(2.3rem,5.4vw,4.6rem);max-width:16ch;}

/* ----------------------------------------------------------------- cards */
.grid{display:grid;gap:1px;background:var(--rule);border:var(--hair);}
@media (min-width:700px){.grid--2{grid-template-columns:repeat(2,1fr);}}
@media (min-width:920px){.grid--3{grid-template-columns:repeat(3,1fr);}}
@media (min-width:700px){.grid--4{grid-template-columns:repeat(2,1fr);}}
@media (min-width:1080px){.grid--4{grid-template-columns:repeat(4,1fr);}}

.cell{background:var(--paper);padding:clamp(24px,3vw,38px);position:relative;}
.cell__no{
  font-family:var(--data);font-size:.7rem;letter-spacing:.18em;color:var(--graphite);
  display:block;margin-bottom:1.1rem;
}
.cell__no b{color:var(--accent);font-weight:500;}
.cell h3{margin-bottom:.6rem;}
.cell p{font-size:.95rem;color:#33363B;}
.cell--hover{transition:background .2s;}
.cell--hover:hover{background:var(--mist);}
.band--mist .cell{background:var(--paper);}
.band--ink .grid{background:#26282D;border-color:#26282D;}
.band--ink .cell{background:var(--ink);}
.band--ink .cell p{color:#A9ADB4;}

/* list of capabilities, set like a parts schedule */
.schedule{border-top:var(--hair);margin:0;padding:0;list-style:none;}
.schedule li{
  border-bottom:var(--hair);padding:14px 0;display:flex;gap:1rem;align-items:baseline;
  font-size:.96rem;
}
.schedule li span{
  font-family:var(--data);font-size:.68rem;letter-spacing:.14em;color:var(--graphite);
  flex:none;width:44px;
}
.schedule li:hover span{color:var(--accent);}

/* pill row */
.pills{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;}
.pills li{
  font-family:var(--data);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  border:var(--hair);padding:7px 12px;color:#3A3D42;
}
.band--ink .pills li{border-color:#33363C;color:#B4B8BE;}

/* callout / quote block */
.thesis{
  border-left:3px solid var(--accent);padding:6px 0 6px 26px;
  font-family:var(--display);font-weight:700;text-transform:uppercase;
  font-size:clamp(1.3rem,2.6vw,2.1rem);line-height:1.06;letter-spacing:-0.02em;
  max-width:24ch;
}

/* dithered artwork frames */
.plate-img{border:var(--hair);background:var(--paper);padding:10px;}
.plate-img img{width:100%;image-rendering:pixelated;}
.plate-img figcaption{
  font-family:var(--data);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--graphite);padding:12px 4px 2px;border-top:var(--hair);margin-top:10px;
}
.band--ink .plate-img{border-color:#2C2F35;background:var(--ink);}
.band--ink .plate-img img{filter:invert(1);}
.band--ink .plate-img figcaption{border-color:#2C2F35;color:#8B8F96;}

/* stat strip */
.stats{display:grid;gap:1px;background:var(--rule);border:var(--hair);}
@media (min-width:760px){.stats{grid-template-columns:repeat(4,1fr);}}
.stat{background:var(--paper);padding:26px clamp(18px,2vw,30px);}
.stat b{
  display:block;font-family:var(--display);font-weight:800;font-size:clamp(1.9rem,3.4vw,2.9rem);
  line-height:1;letter-spacing:-0.03em;
}
.stat span{
  display:block;margin-top:.7rem;font-family:var(--data);font-size:.68rem;
  letter-spacing:.16em;text-transform:uppercase;color:var(--graphite);
}

/* process rail — a real sequence, so it is numbered */
.rail{list-style:none;margin:0;padding:0;counter-reset:step;}
.rail li{
  counter-increment:step;border-top:var(--hair);padding:20px 0 20px 62px;position:relative;
}
.rail li:last-child{border-bottom:var(--hair);}
.rail li::before{
  content:counter(step,decimal-leading-zero);position:absolute;left:0;top:20px;
  font-family:var(--data);font-size:.74rem;letter-spacing:.1em;color:var(--accent);
}
.rail h4{margin:0 0 .25rem;font-family:var(--display);text-transform:uppercase;}
.rail p{font-size:.94rem;color:#3A3D42;margin:0;}

/* ------------------------------------------------------------------ form */
.form{display:grid;gap:16px;}
@media (min-width:620px){.form__row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}}
.field label{
  display:block;font-family:var(--data);font-size:.68rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--graphite);margin-bottom:7px;
}
.field input,.field select,.field textarea{
  width:100%;font-family:var(--body);font-size:1rem;color:var(--ink);
  background:var(--paper);border:var(--hair);border-radius:0;padding:12px 14px;
}
.field textarea{min-height:130px;resize:vertical;}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent);
}
.formnote{font-family:var(--data);font-size:.68rem;letter-spacing:.1em;color:var(--graphite);line-height:1.6;}
.formstatus{font-family:var(--data);font-size:.74rem;letter-spacing:.1em;color:var(--accent);min-height:1.2em;}

/* ---------------------------------------------------------- title block */
.titleblock{border-top:2px solid var(--ink);background:var(--paper);}
.tb__grid{
  max-width:var(--shell);margin:0 auto;padding:0 var(--gut);
  display:grid;gap:0;
}
@media (min-width:820px){.tb__grid{grid-template-columns:2fr 1fr 1fr 1.2fr;}}
.tb__cell{padding:26px 0;border-bottom:var(--hair);}
@media (min-width:820px){
  .tb__cell{padding:28px 26px;border-right:var(--hair);border-bottom:0;}
  .tb__cell:first-child{padding-left:0;}
  .tb__cell:last-child{border-right:0;padding-right:0;}
}
.tb__cell h5{
  margin:0 0 .8rem;font-family:var(--data);font-size:.64rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--graphite);font-weight:400;
}
.tb__cell p,.tb__cell a{font-size:.92rem;margin:0 0 .3rem;text-decoration:none;display:block;}
.tb__cell a:hover{color:var(--accent);}
.tb__foot{
  border-top:var(--hair);
}
.tb__foot .shell{
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  padding-block:18px;font-family:var(--data);font-size:.64rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--graphite);
}

/* --------------------------------------------------------------- reveals */
/* The hidden state is applied only when JavaScript is running, so the page
   is fully readable if the script never loads. */
.js [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.3,1);}
.js [data-reveal].is-in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  .js [data-reveal]{opacity:1;transform:none;transition:none;}
}

/* ------------------------------------------------------------- utilities */
.halftone{
  background-image:url("../img/halftone-tile.png");
  background-size:120px;opacity:.5;
}
.u-center{text-align:center;}
.u-narrow{max-width:62ch;}
.u-mt{margin-top:2rem;}
.skip{
  position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;
  padding:12px 18px;z-index:99;font-family:var(--data);font-size:.75rem;
}
.skip:focus{left:16px;top:16px;}