/* ==========================================================================
   GSL public site - "survey sheet" visual system.
   Geometric type, hairline drafting grid, framed photographic plates.
   Palette is taken from the logo: #B00000 red, ink black, paper white.
   ========================================================================== */
@import url('https://fonts.googleapis.com/css2?family=Jost:wght@300;400;500;600&display=swap');

:root{
  --red:#B00000;
  --red-dark:#8a0000;
  --ink:#121212;
  --copy:#33322f;
  --muted:#6d6a63;
  --paper:#f7f5f0;
  --paper-deep:#efece4;
  --white:#ffffff;
  --line:#d9d4c9;
  --line-strong:#b9b3a6;
  --shadow:0 18px 50px rgba(18,18,18,.10);
  color-scheme:light;
}
html[data-theme=dark]{
  --ink:#f5f2ea;
  --copy:#ddd8cd;
  --muted:#a8a29a;
  --paper:#171614;
  --paper-deep:#201e1b;
  --white:#242220;
  --line:#3b3833;
  --line-strong:#5a564e;
  --shadow:0 18px 50px rgba(0,0,0,.45);
  color-scheme:dark;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Century Gothic","CenturyGothic","AppleGothic",Jost,Futura,"Trebuchet MS",sans-serif;
  font-size:18px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
button{font:inherit}
.wrap{width:min(1240px,calc(100% - 72px));margin:0 auto}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:40;background:var(--paper);border-bottom:1px solid var(--line)}
.header-rule{height:5px;background:var(--red)}
.nav-wrap{height:92px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center}
.brand img{display:block;width:min(330px,32vw);height:auto;max-height:58px;object-fit:contain;background:#fff;padding:5px 7px;border:1px solid #e7e2d8}
.main-nav{display:flex;align-items:center;gap:4px}
.main-nav>a{
  padding:10px 13px;font-size:12.5px;letter-spacing:.13em;color:var(--copy);
  border-bottom:1px solid transparent;transition:color .18s,border-color .18s;
}
.main-nav>a:hover,.main-nav>a:focus{color:var(--red);border-bottom-color:var(--red)}
.theme-toggle{
  margin-left:12px;display:flex;align-items:center;gap:7px;padding:9px 12px;cursor:pointer;
  background:transparent;color:var(--copy);border:1px solid var(--line-strong);
  font-size:10.5px;letter-spacing:.14em;
}
.theme-toggle:hover{color:var(--red);border-color:var(--red)}
.theme-dot{width:11px;height:11px;border-radius:50%;background:var(--red);box-shadow:inset 0 0 0 3px var(--paper)}
.menu-toggle,.menu-close,.menu-backdrop{display:none}

/* ---------- Home hero ---------- */
.hero{
  border-bottom:1px solid var(--line);
  background:
    linear-gradient(to right,var(--line) 1px,transparent 1px) 0 0/96px 96px,
    linear-gradient(to bottom,var(--line) 1px,transparent 1px) 0 0/96px 96px,
    var(--paper);
}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;align-items:stretch;gap:0;min-height:600px}
.hero-copy{padding:86px 64px 86px 0;display:flex;flex-direction:column;justify-content:center}
.hero-copy h1{
  margin:0;font-size:clamp(44px,6.4vw,86px);line-height:.94;letter-spacing:-.035em;
  font-weight:400;text-transform:uppercase;max-width:11ch;
}
.hero-tagline{
  margin:34px 0 0;padding-left:22px;border-left:5px solid var(--red);
  font-size:clamp(18px,1.55vw,22px);line-height:1.6;max-width:34ch;color:var(--copy);
}
.hero-nav{display:flex;gap:10px;margin-top:42px}
.hero-nav button{
  width:52px;height:46px;border:1px solid var(--line-strong);background:var(--white);color:var(--ink);
  cursor:pointer;font-size:19px;line-height:1;transition:.18s;
}
.hero-nav button:hover{background:var(--red);border-color:var(--red);color:#fff}
.hero-plate{padding:44px 0 44px 44px;display:flex}
.plate-frame{position:relative;flex:1;background:var(--white);padding:14px;border:1px solid var(--line-strong)}
.plate-frame:after{content:"";position:absolute;left:14px;top:14px;width:58px;height:6px;background:var(--red)}
.plate-slides{position:relative;height:100%;min-height:420px;overflow:hidden;background:var(--paper-deep)}
.plate-slides img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:0;transition:opacity .55s;filter:saturate(.85) contrast(1.02)}
.plate-slides img:first-child{opacity:1}

/* ---------- Home index cells ---------- */
.index-section{border-bottom:1px solid var(--line)}
.index-grid{display:grid;grid-template-columns:repeat(3,1fr)}
.index-cell{padding:56px 38px 58px;border-left:1px solid var(--line);display:flex;flex-direction:column}
.index-cell:first-child{border-left:0;padding-left:0}
.index-cell:last-child{padding-right:0}
.index-cell h2{margin:0 0 16px;font-size:22px;letter-spacing:.02em;font-weight:600}
.index-cell p{margin:0 0 22px;font-size:16.5px;line-height:1.75;color:var(--muted)}
.ledger-link{
  margin-top:auto;align-self:flex-start;font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--red);border-bottom:2px solid var(--red);padding-bottom:4px;
}
.ledger-link:hover{color:var(--red-dark)}

/* ---------- Services ledger ---------- */
.ledger-section{padding:84px 0 90px;background:var(--white);border-bottom:1px solid var(--line)}
.section-title{
  margin:0 0 26px;font-size:13px;letter-spacing:.22em;text-transform:uppercase;font-weight:500;color:var(--muted);
  display:flex;align-items:center;gap:18px;
}
.section-title:after{content:"";flex:1;height:1px;background:var(--line)}
.ledger{border-top:1px solid var(--ink)}
.ledger-row{
  display:grid;grid-template-columns:minmax(210px,.85fr) 1.5fr 34px;gap:30px;align-items:center;
  padding:28px 6px;border-bottom:1px solid var(--line);transition:background .18s,padding .18s;
}
.ledger-row:hover{background:var(--paper);padding-left:16px}
.row-name{font-size:21px;letter-spacing:.01em;font-weight:600}
.row-copy{font-size:16px;line-height:1.7;color:var(--muted)}
.row-arrow{color:var(--red);font-size:19px;text-align:right}
.ledger-row:hover .row-name{color:var(--red)}

/* ---------- Plates strip ---------- */
.plates-section{padding:72px 0 90px}
.plates{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;align-items:start}
.plate{margin:0;background:var(--white);padding:10px;border:1px solid var(--line-strong)}
.plate img{display:block;width:100%;height:250px;object-fit:cover;filter:saturate(.82)}
.plates .plate:nth-child(2){margin-top:34px}
.plates .plate:nth-child(3){margin-top:12px}
.plates .plate:nth-child(4){margin-top:46px}

/* ---------- Inner pages ---------- */
.sheet{padding:0 0 96px}
.sheet-head{padding:76px 0 40px;border-bottom:1px solid var(--ink)}
.kicker{font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.kicker a{color:var(--red)}
.sheet-head h1{
  margin:22px 0 0;font-size:clamp(40px,6.2vw,78px);line-height:.98;letter-spacing:-.03em;
  font-weight:400;text-transform:uppercase;
}
.sheet-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(260px,.85fr);gap:0;padding-top:0}
.prose,.sheet-grid>article{padding:52px 56px 0 0}
.sheet-grid>aside{border-left:1px solid var(--line);padding:52px 0 0 42px}
.prose p,.sheet-grid>article>p{font-size:18px;line-height:1.9;color:var(--copy);margin:0 0 26px}
.sheet-grid>article>p:first-child{font-size:20px;line-height:1.8;color:var(--ink)}
.ledger-list{list-style:none;margin:0 0 30px;padding:0;border-top:1px solid var(--line)}
.ledger-list li{padding:12px 4px;border-bottom:1px solid var(--line);font-size:16.5px;line-height:1.6}
.ledger-links li{padding:0;border-bottom:1px solid var(--line)}
.ledger-links a{display:block;padding:13px 4px;font-size:16px;transition:.18s}
.ledger-links a:hover{color:var(--red);padding-left:12px}
.side-note h2{font-size:13px;letter-spacing:.2em;text-transform:uppercase;margin:0 0 18px;color:var(--red)}
.side-note h2+h2,.side-note ul+h2{margin-top:40px}
.side-note p{font-size:16px;line-height:1.75;color:var(--muted);margin:0 0 16px}
.plate-wide{margin:38px 0 0}
.plate-wide img{display:block;width:100%;height:340px;object-fit:cover}
.directors{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--ink)}
.director{padding:28px 26px 30px 0;border-bottom:1px solid var(--line);border-right:1px solid var(--line)}
.director:nth-child(even){padding-left:26px;border-right:0}
.director h3{margin:0 0 14px;font-size:21px;font-weight:600;line-height:1.3}
.director p{margin:0 0 4px;font-size:16px;color:var(--muted)}
.project-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--ink);counter-reset:none}
.project-list li{padding:22px 0;border-bottom:1px solid var(--line)}
.project-list strong{display:block;font-size:17.5px;font-weight:600;line-height:1.55}
.project-list span{display:block;margin-top:8px;font-size:16px;color:var(--muted);line-height:1.65}
.contact-rows p{border-bottom:1px solid var(--line);padding:0 0 18px;margin:0 0 18px}
.contact-rows b{color:var(--ink)}
.contact-rows a{color:var(--red);border-bottom:1px solid var(--red)}
.map-frame{margin-top:34px;padding:12px;background:var(--white);border:1px solid var(--line-strong)}
.map-frame iframe{display:block;width:100%;height:420px;border:0;filter:grayscale(.18)}

/* ---------- Footer ---------- */
.site-footer{background:#141312;color:#f2efe7;padding:0}
.footer-rule{height:7px;background:var(--red)}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;padding:64px 0 46px}
.footer-grid section{padding:0 30px;border-left:1px solid #37342f}
.footer-grid section:first-child{padding-left:0;border-left:0}
.footer-grid section:last-child{padding-right:0}
.footer-grid h2{font-size:12px;letter-spacing:.2em;margin:0 0 18px;color:#f7f4ec;font-weight:600}
.footer-grid p{font-size:15.5px;line-height:1.8;color:#c8c3b8;margin:0 0 12px}
.footer-bottom{
  border-top:1px solid #37342f;min-height:70px;display:flex;align-items:center;justify-content:space-between;
  gap:24px;font-size:11.5px;letter-spacing:.12em;color:#b8b2a7;
}
.footer-bottom nav{display:flex;flex-wrap:wrap;gap:18px}
.footer-bottom nav a{color:#ece7db}
.footer-bottom nav a:hover{color:#ff8a8a}

/* ---------- Utilities ---------- */
.back-top{
  position:fixed;right:22px;bottom:22px;width:50px;height:50px;border:0;background:var(--red);color:#fff;
  font-size:24px;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(10px);transition:.22s;z-index:30;
}
.back-top.visible{opacity:1;pointer-events:auto;transform:none}
.back-top:hover{background:var(--red-dark)}
.form-success{padding:16px;border-left:4px solid var(--red);background:var(--paper-deep);font-size:16px}
.not-found{padding:120px 0}
.not-found h1{font-size:96px;margin:0 0 20px;color:var(--red)}
.sheet-grid .map-frame+*{margin-top:20px}

/* ---------- Responsive ---------- */
@media(max-width:1080px){
  .wrap{width:calc(100% - 48px)}
  .main-nav>a{padding:10px 8px;font-size:11.5px}
  .hero-copy{padding:64px 40px 64px 0}
  .hero-plate{padding:34px 0 34px 26px}
  .ledger-row{grid-template-columns:1fr 1.2fr 28px;gap:20px}
  .sheet-grid{grid-template-columns:minmax(0,1.7fr) minmax(230px,.8fr)}
  .prose,.sheet-grid>article{padding-right:34px}
  .sheet-grid>aside{padding-left:28px}
}
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;min-height:0}
  .hero-copy{padding:64px 0 44px}
  .hero-plate{padding:0 0 56px}
  .plate-slides{min-height:340px}
  .index-grid{grid-template-columns:1fr}
  .index-cell{padding:34px 0;border-left:0;border-bottom:1px solid var(--line)}
  .index-cell:last-child{border-bottom:0;padding-bottom:0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:0}
  .footer-grid section{padding:26px 22px;border-left:1px solid #37342f;border-top:1px solid #37342f}
  .footer-grid section:nth-child(odd){padding-left:0;border-left:0}
  .sheet-grid{grid-template-columns:1fr}
  .prose,.sheet-grid>article{padding:40px 0 0}
  .sheet-grid>aside{border-left:0;border-top:1px solid var(--line);padding:34px 0 0;margin-top:38px}
}
@media(max-width:760px){
  body{font-size:17px}
  .wrap{width:calc(100% - 36px)}
  .nav-wrap{height:76px}
  .brand img{width:min(230px,58vw);max-height:48px}
  .menu-toggle{
    display:flex;flex-direction:column;justify-content:center;gap:6px;width:46px;height:42px;
    padding:6px;background:none;border:0;cursor:pointer;margin-left:auto;
  }
  .menu-toggle span{display:block;width:28px;height:2px;background:var(--ink)}
  .main-nav{
    position:fixed;top:0;left:-110%;bottom:0;width:min(84vw,330px);height:100dvh;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    padding:86px 26px 30px;background:var(--paper);border-right:1px solid var(--line);
    box-shadow:16px 0 40px rgba(0,0,0,.22);z-index:60;
    visibility:hidden;transition:left .28s ease,visibility .28s;
  }
  .main-nav.open{left:0;visibility:visible}
  .main-nav>a{padding:16px 2px;font-size:15px;letter-spacing:.12em;border-bottom:1px solid var(--line)}
  .menu-close{
    display:grid;place-items:center;position:absolute;right:18px;top:20px;width:44px;height:44px;
    background:none;border:1px solid var(--line-strong);color:var(--red);font-size:28px;line-height:1;cursor:pointer;
  }
  .menu-backdrop{display:block;position:fixed;inset:0;background:rgba(8,8,8,.55);z-index:55;opacity:0;visibility:hidden;transition:.28s}
  .menu-backdrop.open{opacity:1;visibility:visible}
  .theme-toggle{margin:22px 0 0;align-self:flex-start;padding:11px 14px;font-size:10px}
  .hero-copy{padding:44px 0 32px}
  .hero-copy h1{font-size:clamp(38px,11vw,56px);max-width:none}
  .hero-tagline{margin-top:24px;font-size:17.5px;padding-left:16px;border-left-width:4px}
  .hero-nav{margin-top:28px}
  .hero-plate{padding-bottom:40px}
  .plate-frame{padding:10px}
  .plate-slides{min-height:250px}
  .index-cell h2{font-size:20px}
  .ledger-section{padding:52px 0 56px}
  .ledger-row{grid-template-columns:1fr 26px;gap:10px;padding:20px 2px}
  .row-copy{grid-column:1;grid-row:2;font-size:15.5px}
  .row-arrow{grid-column:2;grid-row:1/3}
  .row-name{font-size:18px}
  .plates-section{padding:44px 0 56px}
  .plates{grid-template-columns:1fr 1fr;gap:12px}
  .plates .plate:nth-child(n){margin-top:0}
  .plate img{height:165px}
  .sheet-head{padding:44px 0 28px}
  .sheet-head h1{font-size:clamp(34px,9.5vw,48px);margin-top:16px}
  .prose p,.sheet-grid>article>p{font-size:17px;line-height:1.8}
  .sheet-grid>article>p:first-child{font-size:18px}
  .directors{grid-template-columns:1fr}
  .director,.director:nth-child(even){padding:24px 0;border-right:0}
  .plate-wide img{height:230px}
  .map-frame iframe{height:300px}
  .project-list strong{font-size:16.5px}
  .footer-grid{grid-template-columns:1fr}
  .footer-grid section,.footer-grid section:nth-child(odd){padding:24px 0;border-left:0;border-top:1px solid #37342f}
  .footer-grid section:first-child{border-top:0;padding-top:0}
  .footer-bottom{padding:18px 0;flex-direction:column;align-items:flex-start;gap:12px}
  .footer-bottom nav{gap:10px 16px}
  .footer-bottom nav a{font-size:11px}
  .back-top{width:44px;height:44px;right:14px;bottom:14px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}