/* BirdWatchingTowers — shared stylesheet
   Base design ported from the v1 single-page artifact; extended for
   multi-page site (subpages, breadcrumbs, specs, language switcher). */

:root{
  --bg:#EDEFE6;
  --surface:#F6F7F0;
  --surface-2:#E2E6D8;
  --surface-3:#D7DCC8;
  --text:#16211C;
  --text-muted:#4A564C;
  --text-faint:#7C8A79;
  --border:#C7CDB6;
  --border-strong:#A9B294;
  --accent:#B85E17;
  --accent-strong:#8F4710;
  --accent-tint:#F0DCC3;
  --canopy:#2E4A34;
  --canopy-tint:#DCE6D4;
  --shadow: 0 1px 2px rgba(22,33,28,0.06), 0 8px 24px -12px rgba(22,33,28,0.18);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#121A14; --surface:#182219; --surface-2:#20291E; --surface-3:#2A3526;
    --text:#E9ECDD; --text-muted:#AAB89D; --text-faint:#7C8B75;
    --border:#324033; --border-strong:#455242;
    --accent:#E79A45; --accent-strong:#F4B266; --accent-tint:#3A2E1C;
    --canopy:#8FBB8A; --canopy-tint:#243A29;
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 12px 32px -14px rgba(0,0,0,0.55);
  }
}
:root[data-theme="dark"]{
  --bg:#121A14; --surface:#182219; --surface-2:#20291E; --surface-3:#2A3526;
  --text:#E9ECDD; --text-muted:#AAB89D; --text-faint:#7C8B75;
  --border:#324033; --border-strong:#455242;
  --accent:#E79A45; --accent-strong:#F4B266; --accent-tint:#3A2E1C;
  --canopy:#8FBB8A; --canopy-tint:#243A29;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 12px 32px -14px rgba(0,0,0,0.55);
}

*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:"Public Sans", -apple-system, "Segoe UI", sans-serif;
  font-size:16px; line-height:1.55; -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;}
h1,h2,h3{font-family:"Fraunces", Georgia, serif; text-wrap:balance; margin:0; font-weight:560;}
.mono{font-family:"IBM Plex Mono", ui-monospace, monospace;}
.eyebrow{
  font-family:"IBM Plex Mono", monospace; font-size:0.72rem; letter-spacing:0.12em;
  text-transform:uppercase; color:var(--accent-strong); font-weight:600;
}
.wrap{max-width:1180px; margin:0 auto; padding:0 28px;}
@media (max-width:640px){ .wrap{padding:0 18px;} }

/* ---------- header ---------- */
header.site{
  position:relative; z-index:5; display:flex; align-items:center; justify-content:space-between;
  padding:22px 28px; max-width:1180px; margin:0 auto; gap:20px; flex-wrap:wrap;
}
.brand{
  display:flex; align-items:baseline; gap:9px;
  font-family:"Fraunces", serif; font-weight:560; font-size:1.18rem; letter-spacing:-0.01em;
  text-decoration:none; color:var(--text);
}
.brand em{font-style:italic; font-weight:440; color:var(--accent);}
.head-right{display:flex; align-items:center; gap:26px; flex-wrap:wrap;}
nav.site a{font-size:0.86rem; font-weight:600; text-decoration:none; margin-left:26px; color:var(--text-muted);}
nav.site a:first-child{margin-left:0;}
nav.site a:hover, nav.site a.active{color:var(--accent-strong);}
@media (max-width:760px){ nav.site{display:none;} }
.lang-switch{display:flex; gap:10px; font-family:"IBM Plex Mono",monospace; font-size:0.74rem;}
.lang-switch a{text-decoration:none; color:var(--text-faint); padding:3px 7px; border:1px solid var(--border); border-radius:2px;}
.lang-switch a.active{color:var(--accent-strong); border-color:var(--accent-strong);}
.lang-switch a:hover{color:var(--accent-strong); border-color:var(--border-strong);}

/* ---------- hero (home) ---------- */
.hero{position:relative; margin:8px 16px 0; border-radius:2px; overflow:hidden; isolation:isolate;}
@media (max-width:640px){ .hero{margin:8px 8px 0;} }
.hero img{width:100%; height:min(78vh,640px); min-height:420px; object-fit:cover; object-position:58% 40%; filter:saturate(1.03);}
.hero::after{content:""; position:absolute; inset:0; background:linear-gradient(180deg, rgba(10,14,10,0.15) 0%, rgba(10,14,10,0.18) 35%, rgba(9,13,8,0.88) 100%);}
.hero-copy{position:absolute; left:0; right:0; bottom:0; padding:38px 40px 34px; color:#F2F3E9; text-shadow:0 1px 3px rgba(0,0,0,0.55);}
@media (max-width:640px){ .hero-copy{padding:26px 20px 24px;} }
.hero-copy .eyebrow{color:#F4C88C;}
.hero-copy h1{font-size:clamp(2.3rem, 5.4vw, 4.1rem); color:#FBFBF3; margin:10px 0 14px; max-width:14ch; line-height:1.02;}
.hero-copy h1 em{color:#F4B266; font-style:italic; font-weight:440;}
.hero-copy p.lede{max-width:46ch; font-size:1.05rem; color:#DCE0CE; margin:0;}
.hero-stats{display:flex; flex-wrap:wrap; gap:26px 40px; margin-top:26px; padding-top:20px; border-top:1px solid rgba(242,243,233,0.35);}
.hero-stats .stat b{display:block; font-family:"IBM Plex Mono",monospace; font-size:1.5rem; color:#FBFBF3; font-weight:600; font-variant-numeric:tabular-nums;}
.hero-stats .stat span{font-size:0.72rem; letter-spacing:0.08em; text-transform:uppercase; color:#E4E8D6;}

/* ---------- sub-hero (inner pages) ---------- */
.subhero{position:relative; margin:8px 16px 0; border-radius:2px; overflow:hidden; isolation:isolate;}
@media (max-width:640px){ .subhero{margin:8px 8px 0;} }
.subhero img{width:100%; height:min(52vh,440px); min-height:280px; object-fit:cover; filter:saturate(1.02);}
.subhero::after{content:""; position:absolute; inset:0; background:linear-gradient(180deg, rgba(10,14,10,0.08) 0%, rgba(9,13,8,0.66) 100%);}
.subhero-copy{position:absolute; left:0; right:0; bottom:0; padding:30px 36px 26px; color:#F2F3E9;}
@media (max-width:640px){ .subhero-copy{padding:22px 18px 20px;} }
.subhero-copy .eyebrow{color:#F4C88C;}
.subhero-copy h1{font-size:clamp(1.8rem, 4vw, 2.8rem); color:#FBFBF3; margin:8px 0 0; line-height:1.08; max-width:24ch;}
.subhero-copy .loc{font-size:0.92rem; color:#DCE0CE; margin-top:8px;}
.subhero-diagram{position:relative; background:var(--surface-2); border-radius:2px; overflow:hidden; height:min(46vh,380px); min-height:240px; display:flex; align-items:center; justify-content:center; color:var(--text-faint); margin:8px 16px 0;}
@media (max-width:640px){ .subhero-diagram{margin:8px 8px 0;} }
.subhero-diagram svg{width:60%; height:60%;}
.subhero-diagram .concept-tag{position:absolute; top:16px; left:16px; font-family:"IBM Plex Mono",monospace; font-size:0.68rem; letter-spacing:0.08em; text-transform:uppercase; color:var(--text-faint); border:1px solid var(--border-strong); padding:4px 9px; border-radius:2px; background:var(--surface);}
.subhero-diagram .diagram-copy{position:absolute; left:0; right:0; bottom:0; padding:22px 30px; }
.subhero-diagram .diagram-copy .eyebrow{color:var(--accent-strong);}
.subhero-diagram .diagram-copy h1{font-size:clamp(1.6rem,3.6vw,2.4rem); color:var(--text); margin-top:6px;}

/* ---------- breadcrumb ---------- */
.crumb{padding:20px 0 0; font-family:"IBM Plex Mono",monospace; font-size:0.76rem; color:var(--text-faint);}
.crumb a{text-decoration:none; color:var(--text-faint);}
.crumb a:hover{color:var(--accent-strong);}
.crumb span.sep{margin:0 8px; opacity:0.5;}
.crumb span.here{color:var(--text-muted);}

/* ---------- intro (home) ---------- */
.intro{padding:64px 0 12px; display:grid; grid-template-columns: 1.1fr 1.6fr; gap:56px; align-items:start;}
@media (max-width:820px){ .intro{grid-template-columns:1fr; gap:20px;} }
.intro h2{font-size:1.7rem; line-height:1.18; max-width:16ch;}
.intro .body p{color:var(--text-muted); font-size:1.02rem; max-width:62ch;}
.intro .body p + p{margin-top:14px;}
.intro .body strong{color:var(--text); font-weight:600;}

/* ---------- section shell ---------- */
section{padding:56px 0;}
section.tight{padding:40px 0;}
.section-head{display:flex; align-items:baseline; justify-content:space-between; gap:20px; margin-bottom:30px; border-bottom:1px solid var(--border); padding-bottom:16px;}
.section-head h2{font-size:1.55rem;}
.section-head .count{font-family:"IBM Plex Mono",monospace; font-size:0.82rem; color:var(--text-faint);}

/* ---------- elevation tick (subject motif) ---------- */
.tick{display:flex; align-items:center; gap:8px;}
.tick svg{flex:none; display:block;}
.tick .h{font-family:"IBM Plex Mono",monospace; font-weight:600; font-size:0.95rem; color:var(--text); font-variant-numeric:tabular-nums;}
.tick .h small{color:var(--text-faint); font-weight:500; font-size:0.72em;}

/* ---------- gallery (home towers grid) ---------- */
.gallery{display:grid; grid-template-columns:repeat(2, 1fr); gap:2px; background:var(--border); border:1px solid var(--border);}
@media (max-width:760px){ .gallery{grid-template-columns:1fr;} }
.card{background:var(--surface); display:flex; flex-direction:column; text-decoration:none; color:inherit;}
.card .ph{position:relative; overflow:hidden; background:var(--surface-2);}
.card .ph img{width:100%; height:250px; object-fit:cover; transition:transform .5s cubic-bezier(.2,.7,.2,1);}
.card:hover .ph img{transform:scale(1.035);}
.card .biome{position:absolute; top:12px; left:12px; background:rgba(18,26,20,0.72); color:#EFF2E4; font-family:"IBM Plex Mono",monospace; font-size:0.66rem; letter-spacing:0.08em; text-transform:uppercase; padding:5px 9px; border-radius:2px;}
.card .body{padding:20px 22px 22px; display:flex; flex-direction:column; gap:10px; flex:1;}
.card .name{font-size:1.18rem; font-weight:560; line-height:1.22;}
.card .name i{font-style:italic; color:var(--accent-strong); font-weight:440;}
.card .loc{font-size:0.84rem; color:var(--text-faint);}
.card .note{font-size:0.92rem; color:var(--text-muted); flex:1;}
.card .meta-row{display:flex; align-items:center; justify-content:space-between; padding-top:12px; margin-top:2px; border-top:1px dashed var(--border-strong);}
.card .go{font-family:"IBM Plex Mono",monospace; font-size:0.7rem; letter-spacing:0.06em; text-transform:uppercase; color:var(--accent-strong); margin-top:2px;}

/* ---------- small related grid (subject pages) ---------- */
.related-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:14px;}
@media (max-width:820px){ .related-grid{grid-template-columns:repeat(2,1fr);} }
.rcard{display:block; text-decoration:none; color:inherit; background:var(--surface); border:1px solid var(--border);}
.rcard .ph{height:120px; overflow:hidden; background:var(--surface-2);}
.rcard .ph img{width:100%; height:100%; object-fit:cover; transition:transform .4s;}
.rcard:hover .ph img{transform:scale(1.04);}
.rcard .t{padding:12px 14px 14px;}
.rcard .name{font-size:0.92rem; font-weight:600;}
.rcard .loc{font-size:0.74rem; color:var(--text-faint); margin-top:2px;}

/* ---------- capabilities grid (home) ---------- */
.cap-grid{display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--border); border:1px solid var(--border);}
@media (max-width:900px){ .cap-grid{grid-template-columns:repeat(2,1fr);} }
.cap{background:var(--surface); padding:0; text-decoration:none; color:inherit; display:block;}
.cap img{width:100%; height:150px; object-fit:cover;}
.cap-diagram{position:relative; width:100%; height:150px; background:var(--surface-2); display:flex; align-items:center; justify-content:center; color:var(--text-faint);}
.cap-diagram svg{width:82%; height:70%;}
.cap-diagram .concept-tag{position:absolute; top:12px; left:12px; font-family:"IBM Plex Mono",monospace; font-size:0.62rem; letter-spacing:0.08em; text-transform:uppercase; color:var(--text-faint); border:1px solid var(--border-strong); padding:3px 7px; border-radius:2px;}
.cap .t{padding:16px 18px 20px;}
.cap .t .eyebrow{color:var(--text-faint); font-size:0.66rem;}
.cap .t h3{font-size:1.02rem; font-weight:600; margin-top:6px; font-family:"Public Sans",sans-serif;}
.cap .t p{font-size:0.86rem; color:var(--text-muted); margin:6px 0 0;}
.cap:hover .t h3{color:var(--accent-strong);}

/* ---------- specs strip (tower pages) ---------- */
.specs-strip{display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--border); border:1px solid var(--border); margin-top:8px;}
@media (max-width:760px){ .specs-strip{grid-template-columns:repeat(2,1fr);} }
.specs-strip .spec{background:var(--surface); padding:18px 20px;}
.specs-strip .spec .k{font-family:"IBM Plex Mono",monospace; font-size:0.66rem; letter-spacing:0.08em; text-transform:uppercase; color:var(--text-faint);}
.specs-strip .spec .v{font-size:1.05rem; margin-top:6px; font-weight:560; font-family:"Fraunces",serif;}

/* ---------- article body (tower & subject pages) ---------- */
.article-grid{display:grid; grid-template-columns:1.5fr 1fr; gap:56px; align-items:start;}
@media (max-width:900px){ .article-grid{grid-template-columns:1fr; gap:30px;} }
.article-body p{color:var(--text-muted); font-size:1.02rem; max-width:66ch;}
.article-body p + p{margin-top:16px;}
.article-body strong{color:var(--text); font-weight:600;}
.article-body h3{font-size:1.15rem; margin:28px 0 10px; font-weight:560;}
.pull{border-left:3px solid var(--accent); padding:4px 0 4px 22px; margin:26px 0; font-family:"Fraunces",serif; font-style:italic; font-size:1.15rem; line-height:1.4; color:var(--text); max-width:52ch;}
.side-note{background:var(--canopy-tint); border:1px solid var(--border); padding:22px 24px; font-size:0.9rem; color:var(--text);}
.side-note .eyebrow{color:var(--canopy); display:block; margin-bottom:10px;}
.side-note ul{margin:0; padding-left:18px;}
.side-note li{margin:6px 0; color:var(--text-muted);}
.side-note p{color:var(--text-muted); margin:0 0 10px;}

/* ---------- planning ---------- */
.plan-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--border); border:1px solid var(--border);}
@media (max-width:820px){ .plan-grid{grid-template-columns:1fr;} }
.plan-col{background:var(--surface); padding:26px 26px 28px;}
.plan-col .eyebrow{display:block; margin-bottom:12px;}
.plan-col h3{font-size:1.12rem; font-weight:600; font-family:"Public Sans",sans-serif; margin-bottom:14px;}
.plan-col ul{margin:0; padding:0; list-style:none;}
.plan-col li{font-size:0.9rem; color:var(--text-muted); padding:9px 0; border-top:1px solid var(--border);}
.plan-col li:first-child{border-top:none;}
.cost-strip{margin-top:1px; background:var(--canopy-tint); border:1px solid var(--border); border-top:none; padding:22px 26px; display:flex; flex-wrap:wrap; gap:10px 28px; align-items:center;}
.cost-strip .eyebrow{color:var(--canopy); flex-basis:100%;}
.cost-strip .item{font-size:0.86rem; color:var(--text); display:flex; align-items:center; gap:7px;}
.cost-strip .item::before{content:""; width:5px; height:5px; background:var(--accent); border-radius:50%; flex:none;}

/* ---------- prev/next tower nav ---------- */
.prevnext{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--border); border:1px solid var(--border); margin-top:40px;}
@media (max-width:640px){ .prevnext{grid-template-columns:1fr;} }
.prevnext a{background:var(--surface); padding:20px 24px; text-decoration:none; color:inherit; display:block;}
.prevnext a:hover{background:var(--surface-2);}
.prevnext .dir{font-family:"IBM Plex Mono",monospace; font-size:0.68rem; letter-spacing:0.08em; text-transform:uppercase; color:var(--text-faint);}
.prevnext .name{margin-top:6px; font-family:"Fraunces",serif; font-size:1.08rem; font-weight:560;}
.prevnext .next{text-align:right;}

/* ---------- footer ---------- */
footer{margin-top:20px; background:var(--surface-2); border-top:1px solid var(--border);}
.foot-wrap{max-width:1180px; margin:0 auto; padding:52px 28px 40px; display:grid; grid-template-columns:1.3fr 1fr 1fr; gap:40px;}
@media (max-width:820px){ .foot-wrap{grid-template-columns:1fr; gap:30px;} }
footer h3{font-family:"Fraunces",serif; font-size:1.3rem; margin-bottom:10px;}
footer p{color:var(--text-muted); font-size:0.92rem; max-width:40ch;}
footer .colhead{font-size:0.72rem; letter-spacing:0.1em; text-transform:uppercase; color:var(--text-faint); font-family:"IBM Plex Mono",monospace; margin-bottom:14px; display:block;}
footer .line{font-size:0.92rem; padding:6px 0; color:var(--text);}
footer a.contact{text-decoration:none; color:var(--text); border-bottom:1px solid var(--border-strong);}
footer a.contact:hover{color:var(--accent-strong); border-color:var(--accent-strong);}
.bottom-bar{border-top:1px solid var(--border); padding:18px 28px; max-width:1180px; margin:0 auto; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; font-size:0.78rem; color:var(--text-faint); font-family:"IBM Plex Mono",monospace;}

/* ---------- photo gallery + lightbox (tower & subject pages) ---------- */
.photo-gallery{margin-top:40px;}
.photo-gallery .section-head{margin-bottom:18px;}
.gallery-grid{display:grid; grid-template-columns:repeat(auto-fill, minmax(160px,1fr)); gap:10px;}
.gallery-grid button.gthumb{border:1px solid var(--border); background:var(--surface-2); padding:0; cursor:zoom-in; overflow:hidden; aspect-ratio:4/3; display:block; width:100%;}
.gallery-grid button.gthumb img{width:100%; height:100%; object-fit:cover; display:block; transition:transform .4s;}
.gallery-grid button.gthumb:hover img{transform:scale(1.045);}
.gallery-grid button.gthumb:focus-visible{outline:2px solid var(--accent-strong); outline-offset:2px;}

.lightbox-overlay{position:fixed; inset:0; z-index:100; background:rgba(9,13,10,0.92); display:none; align-items:center; justify-content:center; padding:min(6vh,60px) min(5vw,60px);}
.lightbox-overlay.open{display:flex;}
.lightbox-figure{max-width:min(1200px,92vw); max-height:88vh; display:flex; flex-direction:column; align-items:center; gap:12px;}
.lightbox-figure img{max-width:100%; max-height:76vh; object-fit:contain; box-shadow:var(--shadow); background:#000;}
.lightbox-caption{color:#EFF2E4; font-size:0.86rem; text-align:center; max-width:70ch; font-family:"IBM Plex Mono",monospace;}
.lightbox-close, .lightbox-prev, .lightbox-next{position:fixed; background:rgba(18,26,20,0.55); color:#F2F3E9; border:1px solid rgba(242,243,233,0.3); cursor:pointer; font-family:"IBM Plex Mono",monospace; border-radius:2px;}
.lightbox-close{top:18px; right:18px; width:40px; height:40px; font-size:1.1rem; line-height:1;}
.lightbox-prev, .lightbox-next{top:50%; transform:translateY(-50%); width:48px; height:56px; font-size:1.4rem;}
.lightbox-prev{left:14px;} .lightbox-next{right:14px;}
.lightbox-close:hover, .lightbox-prev:hover, .lightbox-next:hover{background:rgba(232,150,60,0.85); border-color:transparent; color:#1A1108;}
@media (max-width:640px){ .lightbox-prev, .lightbox-next{width:38px; height:46px;} }

/* ---------- grayscale-to-colour reveal (hero / subhero imagery) ---------- */
.hero img, .subhero img{animation:hwReveal 2.2s ease-out 0.15s both;}
@keyframes hwReveal{
  0%{filter:saturate(0) contrast(1.04) brightness(0.98);}
  100%{filter:saturate(1) contrast(1) brightness(1);}
}
@media (prefers-reduced-motion: reduce){ .hero img, .subhero img{animation:none;} }

@media (prefers-reduced-motion: reduce){ .card .ph img, .rcard .ph img{transition:none;} }