/* =========================================================
   BTC website styles
   Brand colors and fonts live in :root below. Change them
   here and the whole site updates.
   ========================================================= */
:root{
  --navy:#061c48;        /* top bar, dark sections */
  --navy-deep:#030f27;   /* footer */
  --blue:#2c5eb1;        /* headings, buttons */
  --blue-light:#5b7fc7;  /* core values panel */
  --text:#4d4d4f;        /* body text */
  --white:#fff;
  --gray-bg:#f4f6fa;
  --font-head:"Roboto Condensed","Helvetica Neue",Arial,sans-serif;
  --font-body:"Roboto Condensed","Helvetica Neue",Arial,sans-serif;
  --max:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:18px;line-height:1.7;color:var(--text);background:var(--white)}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
h1,h2,h3,h4,h5,h6{font-family:var(--font-head);font-weight:500;line-height:1.2;margin:0 0 .6em}
h1{font-size:clamp(2rem,4vw,2.8rem)}
h2{font-size:clamp(1.8rem,3.6vw,2.6rem);color:var(--blue)}
h3{font-size:clamp(1.6rem,3vw,2.3rem);color:var(--blue)}
h4{font-size:1.35rem;color:var(--navy)}
h6{font-size:1.15rem;color:var(--navy);font-weight:500}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.section{padding:80px 0}
.section.gray{background:var(--gray-bg)}
.center{text-align:center}
.skip{position:absolute;left:-9999px}.skip:focus{left:10px;top:10px;z-index:999;background:#fff;padding:8px}

/* ---------- Header ---------- */
.topbar{background:var(--navy);color:#fff;font-size:1rem}
.topbar .container{display:flex;justify-content:flex-end;align-items:center;height:40px}
.topbar a{color:#fff;text-decoration:none;letter-spacing:.03em}
.topbar a:before{content:"\260E";margin-right:8px}
.site-header{position:absolute;top:40px;left:0;right:0;z-index:20}
.site-header .container{display:flex;justify-content:space-between;align-items:flex-start}
.logo{display:block;margin-top:-40px}
.logo img{width:120px}
@media (max-width:900px){.logo img{width:90px}.dots{display:none}}
.nav{display:flex;gap:6px;align-items:center;padding-top:22px}
.nav a{color:#fff;text-decoration:none;font-family:var(--font-head);font-size:1.15rem;padding:6px 14px;text-shadow:0 1px 3px rgba(0,0,0,.5)}
.nav a:hover,.nav a.active{background:rgba(44,94,177,.85)}
.nav .has-sub{position:relative}
.nav .sub{display:none;position:absolute;top:100%;left:0;background:var(--navy);min-width:240px;padding:6px 0}
.nav .has-sub:hover .sub,.nav .has-sub:focus-within .sub{display:block}
.nav .sub a{display:block;font-size:1rem;text-shadow:none}
.menu-btn{display:none;background:none;border:0;padding:24px 0 0;cursor:pointer}
.menu-btn span{display:block;width:36px;height:2px;background:#fff;margin:8px 0}
@media (max-width:900px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:100%;right:0;left:0;flex-direction:column;align-items:stretch;background:var(--navy);padding:10px 20px}
  .nav.open{display:flex}
  .nav .sub{display:block;position:static;background:none;padding-left:16px}
}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:640px;color:#fff;display:flex;align-items:flex-end;background:var(--navy) center/cover no-repeat;padding:180px 0 90px}
.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,28,72,.85),rgba(6,28,72,.35) 70%,rgba(6,28,72,.1))}
.hero .container{position:relative;width:100%}
.hero h1{max-width:720px}
.hero p{max-width:640px;font-size:1.15rem}
.hero .caption{position:absolute;right:20px;bottom:-60px;font-size:.95rem;opacity:.9}
.hero.short{min-height:420px;align-items:flex-end;padding-bottom:60px}
.slides{position:absolute;inset:0}
.slides div{position:absolute;inset:0;background:center/cover no-repeat;opacity:0;transition:opacity 1.2s}
.slides div.on{opacity:1}
.dots{position:absolute;right:30px;top:50%;display:flex;flex-direction:column;gap:12px;z-index:2}
.dots button{width:14px;height:14px;border-radius:50%;border:0;background:rgba(255,255,255,.5);cursor:pointer;padding:0}
.dots button.on{background:#fff}
.slide-cap{position:absolute;right:30px;bottom:20px;z-index:2;font-size:.95rem}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;background:var(--blue);color:#fff;text-decoration:none;font-family:var(--font-head);font-size:1.2rem;padding:0 0 0 18px;height:48px;border:0;margin-top:10px}
.btn:after{content:"\2192";display:flex;align-items:center;justify-content:center;width:56px;height:100%;margin-left:18px;background:linear-gradient(90deg,var(--navy) 0 70%,var(--blue) 70%);font-size:1.4rem}
.btn:hover{filter:brightness(1.1)}
.btn.white{background:#fff;color:var(--navy)}
.btn-outline{display:block;text-align:center;border:2px solid var(--blue);color:var(--blue);text-decoration:none;padding:14px;font-family:var(--font-head);font-size:1.2rem;text-transform:uppercase;margin-top:30px}
.btn-outline:hover{background:var(--blue);color:#fff}

/* ---------- Layout helpers ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
@media (max-width:900px){.split{grid-template-columns:1fr;gap:30px}}
.values-panel{background:var(--blue-light);color:#fff;padding:50px}
.values-panel h3{color:#fff}

/* ---------- Project cards ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px;list-style:none;padding:0;margin:30px 0 0}
.card{position:relative;overflow:hidden;aspect-ratio:4/3;background:#ddd}
.card a{display:block;height:100%;color:#fff;text-decoration:none}
.card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.card:hover img{transform:scale(1.05)}
.card h4{position:absolute;left:0;right:0;bottom:0;margin:0;padding:40px 18px 16px;color:#fff;font-size:1.2rem;background:linear-gradient(transparent,rgba(6,28,72,.9))}
.filters{display:flex;flex-wrap:wrap;gap:10px;list-style:none;padding:0;justify-content:center}
.filters button{background:none;border:2px solid var(--blue);color:var(--blue);font-family:var(--font-head);font-size:1.05rem;padding:8px 18px;cursor:pointer}
.filters button.on,.filters button:hover{background:var(--blue);color:#fff}
.card.hide{display:none}

/* ---------- Core values / team ---------- */
.values{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:30px;list-style:none;padding:0}
.values li{text-align:center}
.values img{width:80px;margin:0 auto 14px}
.values strong{display:block;font-family:var(--font-head);font-size:1.4rem;color:var(--blue);font-weight:500}
.team{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:30px;list-style:none;padding:0;margin-top:40px}
.team img{aspect-ratio:4/5;object-fit:cover;width:100%}
.team .name{font-family:var(--font-head);font-size:1.3rem;color:var(--navy);margin-top:12px;line-height:1.3}
.team .title{font-size:1rem;line-height:1.4}

/* ---------- Project detail ---------- */
.facts{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px 30px}
.facts li{border-left:4px solid var(--blue);padding-left:14px}
.facts strong{color:var(--navy)}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;list-style:none;padding:0;margin:30px 0 0}
.gallery a{display:block;aspect-ratio:4/3;overflow:hidden;background:#ddd}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.gallery a:hover img{transform:scale(1.05)}
.video{position:relative;aspect-ratio:16/9;margin-top:30px}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.92);display:none;align-items:center;justify-content:center;z-index:100}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:88vh}
.lightbox button{position:absolute;background:none;border:0;color:#fff;font-size:3rem;cursor:pointer;padding:10px 20px}
.lightbox .close{top:10px;right:10px}.lightbox .prev{left:10px}.lightbox .next{right:10px}

/* ---------- Careers ---------- */
.job{border-top:1px solid #ddd;padding:30px 0}
.job h5{font-size:1rem;letter-spacing:.08em;color:var(--blue);margin:20px 0 6px}

/* ---------- Bidders band / contact band ---------- */
.band{background:var(--navy) center/cover no-repeat;color:#fff;text-align:center;padding:90px 0;position:relative}
.band:before{content:"";position:absolute;inset:0;background:rgba(6,28,72,.75)}
.band .container{position:relative}
.band h3,.band h6{color:#fff}
.contact-band{background:var(--navy-deep) center/cover no-repeat;color:#fff;padding:80px 0 40px;position:relative}
.contact-band:before{content:"";position:absolute;inset:0;background:rgba(3,15,39,.8)}
.contact-band .container{position:relative}
.contact-band h2{color:#fff;font-size:clamp(2.2rem,5vw,3.6rem)}
.form-wrap{background:#fff;padding:20px;color:var(--text)}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-deep);color:#fff;padding:60px 0 30px;font-size:1rem}
.site-footer a{color:#fff}
.footer-grid{display:grid;grid-template-columns:200px 1fr 1fr auto;gap:40px;align-items:start}
.footer-grid h4{color:#fff;font-size:1.1rem;text-transform:uppercase}
.footer-grid p{margin:0}
.social{display:flex;gap:14px}
.social a{display:inline-flex;width:40px;height:40px;border:1px solid rgba(255,255,255,.4);align-items:center;justify-content:center;text-decoration:none;font-weight:700}
.copyright{border-top:1px solid rgba(255,255,255,.15);margin-top:40px;padding-top:20px;font-size:.9rem;opacity:.8}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr;text-align:center}.footer-grid img{margin:0 auto}.social{justify-content:center}}
.to-top{position:fixed;right:20px;bottom:20px;width:46px;height:46px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;text-decoration:none;font-size:1.4rem;z-index:30}
.map{width:100%;height:320px;border:0}