/* ColdRoomKit — industrial B2B theme: white, deep blue, cold accents */
:root{
  --navy:#0b3d66; --blue:#0e7cc4; --sky:#e8f3fb; --ice:#f4f8fb;
  --ink:#1c2b36; --muted:#5a6b78; --line:#d7e3ec; --green:#128c4b; --amber:#b7791f;
  --radius:10px; --maxw:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;line-height:1.6;font-size:16px}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* header / nav */
header.site{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:22px;padding:12px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--navy);white-space:nowrap}
.brand img{width:34px;height:34px}
.brand:hover{text-decoration:none}
nav.main{margin-left:auto;display:flex;align-items:center;gap:4px;flex-wrap:wrap}
nav.main>a,nav.main .drop>span{display:inline-block;padding:8px 12px;color:var(--ink);font-size:15px;border-radius:6px;cursor:pointer}
nav.main>a:hover,nav.main .drop>span:hover{background:var(--sky);text-decoration:none}
.drop{position:relative}
.drop .menu{display:none;position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);border-radius:8px;min-width:230px;box-shadow:0 10px 30px rgba(11,61,102,.12);padding:6px}
.drop:hover .menu{display:block}
.drop.open .menu{display:block}
.drop:focus-within .menu{display:block}
.drop .menu a{display:block;padding:8px 10px;color:var(--ink);border-radius:6px;font-size:14.5px}
.drop .menu a:hover{background:var(--sky);text-decoration:none}
.btn{display:inline-block;padding:10px 20px;border-radius:8px;font-weight:600;font-size:15px;border:1px solid transparent}
.btn:hover{text-decoration:none;filter:brightness(1.06)}
.btn-wa{background:var(--green);color:#fff}
.btn-blue{background:var(--blue);color:#fff}
.btn-ghost{background:#fff;color:var(--navy);border-color:var(--navy)}
.nav .btn{padding:8px 16px}

/* hero */
.hero{background:linear-gradient(135deg,var(--navy),#0a5b8f 60%,var(--blue));color:#fff;padding:56px 0 48px}
.hero h1{font-size:36px;line-height:1.2;margin:0 0 14px}
.hero p{font-size:18px;color:#d8ecf9;max-width:720px;margin:0 0 24px}
.hero .cta-row{display:flex;gap:12px;flex-wrap:wrap}
.hero .btn-ghost{background:transparent;color:#fff;border-color:#fff}

/* sections */
section{padding:44px 0}
section.alt{background:var(--ice)}
h2{font-size:27px;color:var(--navy);margin:0 0 10px;line-height:1.25}
h3{font-size:19px;color:var(--navy);margin:0 0 8px}
.lead{color:var(--muted);max-width:780px;margin:0 0 26px}
.grid{display:grid;gap:18px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin-top:0}
.card p{color:var(--muted);margin:0 0 12px;font-size:15px}
.card .go{font-weight:600;font-size:14.5px}
.tag{display:inline-block;background:var(--sky);color:var(--navy);font-size:12.5px;font-weight:600;padding:3px 10px;border-radius:20px;margin-bottom:10px}

/* tables */
table{width:100%;border-collapse:collapse;background:#fff;font-size:15px;margin:14px 0}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
th{background:var(--navy);color:#fff;font-weight:600}
tr:nth-child(even) td{background:#fbfdfe}

/* FAQ */
details{border:1px solid var(--line);border-radius:8px;background:#fff;margin-bottom:10px;padding:0 18px}
details summary{cursor:pointer;font-weight:600;color:var(--navy);padding:14px 0}
details p{color:var(--muted);margin:0 0 14px}

/* calculator */
.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:start}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.panel h3{margin-top:0}
label{display:block;font-weight:600;font-size:14.5px;margin:14px 0 5px;color:var(--navy)}
label:first-of-type{margin-top:0}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:7px;font-size:15px;font-family:inherit;background:#fff}
input:focus,select:focus,textarea:focus{outline:2px solid var(--sky);border-color:var(--blue)}
.dims{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.hint{font-size:13px;color:var(--muted);margin-top:4px}
.result-row{display:flex;justify-content:space-between;gap:14px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:15px}
.result-row b{color:var(--navy);text-align:right}
.result-row:last-child{border-bottom:none}
.note{background:#fff8e6;border:1px solid #ecd9a0;border-radius:8px;padding:12px 16px;font-size:14px;color:#6b5310;margin:16px 0}
.solar-tip{background:var(--sky);border:1px solid #bcdcf3;border-radius:8px;padding:12px 16px;font-size:14.5px;color:var(--navy);margin:16px 0}
.empty{color:var(--muted);font-size:15px}

/* CTA band */
.cta-band{background:var(--navy);color:#fff;border-radius:var(--radius);padding:30px;text-align:center}
.cta-band h2{color:#fff}
.cta-band p{color:#cfe6f5;margin:0 auto 20px;max-width:640px}
.cta-band .cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* content images */
.page-img{display:block;width:100%;max-width:100%;height:auto;border-radius:var(--radius);margin:8px 0 4px}
.page-img.small{max-width:560px}
.hero-img{display:block;width:100%;height:auto;border-radius:var(--radius);margin-top:30px;box-shadow:0 18px 40px rgba(0,0,0,.28)}
.card-img{display:block;width:100%;height:auto;border-radius:8px;margin-bottom:14px}

/* footer */
footer.site{background:#082c4a;color:#cfe0ee;margin-top:0;padding:38px 0 26px;font-size:14.5px}
footer.site a{color:#9fd0f5}
footer.site h4{color:#fff;margin:0 0 10px;font-size:15px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:26px}
footer.site ul{list-style:none;margin:0;padding:0}
footer.site li{margin-bottom:7px}
.foot-bottom{border-top:1px solid #14507c;margin-top:26px;padding-top:16px;color:#8fb4cf;font-size:13px}

@media (max-width:820px){
  .grid.c2,.grid.c3,.grid.c4,.calc-grid,.foot-grid{grid-template-columns:1fr}
  .hero h1{font-size:29px}
  .hero p{font-size:16px}
  nav.main{gap:0}
  nav.main>a,nav.main .drop>span{padding:7px 8px;font-size:14px}
  .brand{font-size:18px}
}