/*
 * HeatCoolFix. Three colours only: white, grey and blue.
 * White page, grey lines and grey bands, navy and blue for anything that leads
 * the eye. Nothing decorative.
 */
:root{
  --ink:#16202e;        /* body text, a near black with a blue cast */
  --soft:#5b6775;       /* grey text */
  --line:#dbe3ec;       /* hairline */
  --line-2:#c3d2e4;     /* stronger hairline, form fields */
  --bg:#fff;
  --tint:#f2f5f9;       /* light grey band */
  --tint-2:#e7eef7;     /* grey blue block, table heads */
  --navy:#0b2e5e;       /* hero, footer, headings */
  --on-navy:#c6d8f0;    /* text on navy */
  --link:#0b5cc4; --link-dark:#0a4ea6;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --wrap:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:18px;line-height:1.7;-webkit-font-smoothing:antialiased}
img,svg,iframe,video{max-width:100%;height:auto}
a{color:var(--link)}
a:hover{color:var(--link-dark)}
.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:20px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:#fff;padding:10px 14px;border:1px solid var(--line);z-index:99}

/* header: a thin top bar, the main row, then the menu row.
   The whole header is sticky with a negative top, so the first two rows scroll
   away and the menu row stays pinned. On a phone nothing sticks, a small screen
   has no room to give away. */
.site-head{background:#fff;position:sticky;top:-137px;z-index:30}

.topbar{background:var(--navy);color:var(--on-navy);font-size:14px}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:40px}
.topbar .tag{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.top-nav{display:flex;gap:22px;white-space:nowrap;list-style:none;margin:0;padding:0}
.top-nav li{list-style:none;margin:0}
.top-nav a{color:#cfe0f5;text-decoration:none}
.top-nav a:hover{color:#fff;text-decoration:underline}

.head-main .wrap{display:flex;align-items:center;gap:26px;height:96px}
.brand{display:inline-flex;align-items:center;gap:12px;font-weight:700;font-size:26px;letter-spacing:-.025em;text-decoration:none;color:var(--navy);white-space:nowrap}
.brand .mk{flex:none;display:block}
.brand i{font-style:normal;color:var(--link)}
.head-search{margin-left:auto;width:360px;flex:none}
.head-search .hcf-search{border-radius:7px}
.head-search .hcf-search input[type=search]{padding:12px 15px;font-size:16px}
.head-search .hcf-search button{padding:0 20px;font-size:15.5px}

.head-nav{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.main-nav{display:flex;align-items:center;gap:30px;height:52px;font-size:16px;overflow-x:auto;scrollbar-width:none}
.main-nav::-webkit-scrollbar{display:none}
.main-nav a{color:var(--soft);text-decoration:none;white-space:nowrap}
.main-nav a:hover,.main-nav .current-menu-item>a{color:var(--link)}

@media (max-width:1180px){.head-search{width:300px}.main-nav{gap:26px}}
@media (max-width:1000px){.head-search{width:250px}.main-nav{gap:22px;font-size:15.5px}}
@media (max-width:880px){
  .site-head{position:static}
  .topbar{display:none}
  .head-main .wrap{height:auto;flex-wrap:wrap;padding-block:16px;gap:14px}
  .brand{font-size:23px}
  .head-search{width:100%;margin-left:0}
  .main-nav{height:48px;gap:20px}
}

/* search */
.hcf-search{display:flex;border:1px solid var(--line-2);border-radius:8px;overflow:hidden;background:#fff}
.hcf-search:focus-within{border-color:var(--link)}
.hcf-search input[type=search]{flex:1;border:0;padding:13px 15px;font:inherit;font-size:17px;outline:none;min-width:0;background:transparent;color:var(--ink)}
.hcf-search input[type=search]::placeholder{color:#8d99a8}
.hcf-search button{border:0;background:var(--link);color:#fff;font:inherit;font-size:16px;padding:0 20px;cursor:pointer}
.hcf-search button:hover{background:var(--link-dark)}

/* home hero */
.home-hero{padding:60px 0 54px;background:var(--navy);color:#fff}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:52px;align-items:center}
.home-hero h1{color:#fff;font-size:clamp(30px,4.4vw,46px);line-height:1.14;letter-spacing:-.03em;margin:0 0 14px;max-width:16ch}
.home-hero p.sub{color:var(--on-navy);max-width:52ch;margin:0 0 24px;font-size:18.5px}
.hero-art{justify-self:end;width:100%;max-width:620px}
.hero-art img{width:100%;height:auto;display:block;border-radius:12px;border:1px solid rgba(255,255,255,.25);background:#fff}
.quick{margin:26px 0 0;font-size:16px;color:#a9c3e4;display:flex;flex-wrap:wrap;align-items:center;gap:10px 0}
.quick-lab{margin-right:10px}
.quick a{margin:0 12px 0 0;border:1px solid rgba(255,255,255,.3);border-radius:999px;padding:7px 14px;background:rgba(255,255,255,.08);color:#fff;text-decoration:none;white-space:nowrap;display:inline-block}
.quick a:hover{background:#fff;color:var(--navy);border-color:#fff;text-decoration:none}
@media (max-width:980px){
  .hero-grid{grid-template-columns:minmax(0,1fr);gap:26px}
  .hero-art{justify-self:start;max-width:520px}
  .home-hero{padding:40px 0 36px}
}

/* sections and the grey band */
.section{padding:38px 0}
.band{background:var(--tint);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.band .section{padding:40px 0}
.section-title{font-size:22px;margin:0 0 18px;letter-spacing:-.015em;color:var(--navy)}
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:880px){.cats{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.cats{grid-template-columns:minmax(0,1fr)}}
.cat{background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px 20px;text-decoration:none;color:var(--ink);display:flex;gap:15px;align-items:flex-start;transition:border-color .15s,box-shadow .15s}
.cat .ico{flex:none;width:40px;height:40px;color:var(--navy);margin-top:2px}
.cat .ico .a{stroke:var(--link)}
.cat:hover .ico{color:var(--link)}
.cat-txt{min-width:0}
.cat:hover{border-color:var(--link);box-shadow:0 1px 3px rgba(11,46,94,.08);color:var(--ink)}
.cat b{display:block;font-size:18px;margin-bottom:3px;color:var(--navy)}
.cat .cat-txt>span{display:block;font-size:15px;color:var(--soft);line-height:1.5}

/* post cards with thumbnails */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
@media (max-width:880px){.card-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}}
@media (max-width:560px){.card-grid{grid-template-columns:minmax(0,1fr)}}
.card{display:block;text-decoration:none;color:var(--ink)}
.card .shot{display:block;aspect-ratio:16/9;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--tint)}
.card .shot img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .25s ease}
.card:hover .shot img{transform:scale(1.02)}
.card .tag{display:inline-block;font-size:13px;color:var(--link);margin:10px 0 2px}
.card h3{font-size:19px;line-height:1.3;margin:0;letter-spacing:-.01em;color:var(--navy)}
.card:hover h3{color:var(--link)}
.card p{font-size:16px;color:var(--soft);margin:6px 0 0}

/* post rows with small thumbnails */
.rows{border-top:1px solid var(--line)}
.row{display:grid;grid-template-columns:132px minmax(0,1fr);gap:18px;align-items:start;padding:18px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.row .shot{aspect-ratio:16/9;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--tint)}
.row .shot img{width:100%;height:100%;object-fit:cover;display:block}
.row b{display:block;font-size:19px;font-weight:600;letter-spacing:-.01em;line-height:1.35;color:var(--navy)}
.row .tag{font-size:13px;color:var(--link);display:block;margin-bottom:2px}
.row span.ex{display:block;color:var(--soft);font-size:16.5px;margin-top:3px}
.row:hover b{color:var(--link)}
@media (max-width:560px){.row{grid-template-columns:96px minmax(0,1fr);gap:14px}.row b{font-size:17px}.row span.ex{display:none}}

/* the writer */
.hcf-writer{float:right;width:172px;margin:2px 0 18px 26px;text-align:center}
.hcf-writer img{width:172px;height:172px;border-radius:10px;display:block;border:1px solid var(--line);object-fit:cover}
.hcf-writer>span{display:block;font-size:14px;color:var(--soft);margin-top:9px}
@media (max-width:560px){.hcf-writer{float:none;width:150px;margin:0 0 16px}.hcf-writer img{width:150px;height:150px}}
.entry .meta img.byface{width:26px;height:26px;border-radius:50%;object-fit:cover;vertical-align:-8px;margin-right:8px}

/* placeholder thumbnail */
.ph{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:var(--tint-2);color:var(--navy);font-size:13px;letter-spacing:.02em;text-align:center;padding:8px}

/* article */
.crumbs{font-size:14px;color:var(--soft);padding:18px 0 0}
.crumbs a{color:var(--soft);text-decoration:none}
.crumbs a:hover{color:var(--link);text-decoration:underline}
.cols{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:48px;padding:6px 0 40px}
@media (max-width:920px){.cols{grid-template-columns:minmax(0,1fr);gap:28px}}
.entry{max-width:740px;min-width:0}
.entry h1{font-size:clamp(28px,4.4vw,40px);line-height:1.2;letter-spacing:-.02em;margin:12px 0 10px;color:var(--navy)}
.entry .meta{font-size:14px;color:var(--soft);border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:22px}
.entry p{margin:0 0 18px}
.entry h2{font-size:clamp(22px,3vw,27px);line-height:1.25;letter-spacing:-.015em;margin:36px 0 10px;scroll-margin-top:66px;color:var(--navy)}
.entry h3{font-size:19px;margin:26px 0 6px;scroll-margin-top:66px;color:var(--navy)}
.entry ul,.entry ol{margin:0 0 18px;padding-left:22px}
.entry li{margin-bottom:8px}
.entry img{border-radius:6px}
.entry figure{margin:26px 0}
.entry figure img{border:1px solid var(--line)}
.entry figcaption{font-size:14px;color:var(--soft);padding-top:8px}
.entry table{width:100%;border-collapse:collapse;font-size:16px;margin:22px 0;display:block;overflow-x:auto;white-space:nowrap}
@media (min-width:640px){.entry table{display:table;white-space:normal}}
.entry th{text-align:left;background:var(--tint-2);border:1px solid var(--line);padding:10px 12px;font-size:15px;color:var(--navy)}
.entry td{border:1px solid var(--line);padding:10px 12px;vertical-align:top}
.entry blockquote{margin:22px 0;padding-left:16px;border-left:2px solid var(--line-2);color:var(--soft)}

.hero-shot{margin:0 0 22px}
.hero-shot img{width:100%;border:1px solid var(--line);border-radius:8px;display:block}
.hero-shot figcaption{font-size:14px;color:var(--soft);padding-top:8px}

.answer{background:var(--tint);border:1px solid var(--line);border-radius:6px;padding:16px 18px;margin:0 0 26px}
.answer b{display:block;font-size:14px;color:var(--link);font-weight:600;margin-bottom:4px}
.answer p{margin:0;font-size:18.5px}

.toc{background:var(--tint);border:1px solid var(--line);border-radius:6px;padding:14px 18px;margin:0 0 30px}
.toc b{font-size:15px;color:var(--navy)}
.toc ol{margin:8px 0 0;padding-left:20px;font-size:16px}
.toc li{margin-bottom:5px}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}

.hcf-step{border-top:1px solid var(--line);padding:22px 0}
.hcf-step .lab{font-size:14px;color:var(--link);margin-bottom:4px}
.hcf-step h3{margin:0 0 6px}
.hcf-step p:last-child{margin-bottom:0}
.hcf-step .means{font-size:15px;color:var(--link);font-weight:600}
.hcf-warn{background:var(--tint-2);border:1px solid var(--line-2);border-radius:6px;padding:14px 16px;margin:26px 0;font-size:17px}
.hcf-warn b{color:var(--navy)}

.entry details{border-bottom:1px solid var(--line);padding:14px 0}
.entry summary{cursor:pointer;font-weight:600;font-size:17.5px;color:var(--navy)}
.entry details p{margin:8px 0 0;color:var(--soft)}

.related{border-top:1px solid var(--line);margin-top:34px;padding-top:20px}
.related h2{margin:0 0 14px;font-size:20px;color:var(--navy)}

/* sidebar */
.rail{position:sticky;top:70px;align-self:start;font-size:16px}
.rail .card-box{background:var(--tint);border:1px solid var(--line);border-radius:6px;padding:16px 18px;margin-bottom:20px}
.rail b.h{display:block;font-size:15px;margin-bottom:8px;color:var(--navy)}
.rail a{display:block;padding:7px 0;text-decoration:none;color:var(--ink);font-size:16px;border-bottom:1px solid var(--line);line-height:1.4}
.rail a:last-child{border-bottom:0}
.rail a:hover{color:var(--link)}
@media (max-width:920px){.rail{position:static}}

/* page head band on category, search, 404 and the plain list */
.page-head{background:var(--tint);border-bottom:1px solid var(--line);margin-bottom:28px}
.page-head .wrap{padding-block:22px}
.page-head .crumbs{padding:0 0 8px}
.page-head h1{font-size:clamp(26px,4vw,34px);margin:0;letter-spacing:-.02em;color:var(--navy)}
.page-head p{margin:6px 0 0;color:var(--soft)}

/* pagination */
.pager{display:flex;gap:10px;flex-wrap:wrap;margin:30px 0 10px}
.pager a,.pager span{border:1px solid var(--line);border-radius:6px;padding:8px 14px;text-decoration:none;color:var(--ink);font-size:16px}
.pager .current{background:var(--navy);border-color:var(--navy);color:#fff;font-weight:600}
.pager a:hover{border-color:var(--link);color:var(--link)}

/* footer: four columns on navy, then a thin strip */
.site-foot{background:var(--navy);color:var(--on-navy);margin-top:56px;font-size:16px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1.4fr 1.3fr;gap:44px;padding-block:46px 40px}
@media (max-width:940px){.foot-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:36px 32px}}
@media (max-width:560px){.foot-grid{grid-template-columns:minmax(0,1fr);gap:30px}}
.foot-col p{margin:0 0 12px;color:#9dbde3;font-size:15.5px;line-height:1.6}
.foot-col .dom{color:#7fa0c9;font-size:15px}
.foot-col .h{display:block;color:#fff;font-size:16px;margin:0 0 14px}
.foot-col ul{list-style:none;margin:0;padding:0}
.foot-col li{margin-bottom:9px;line-height:1.4}
.site-foot a{color:#cfe0f5;text-decoration:none}
.site-foot a:hover{color:#fff;text-decoration:underline}
.foot-brand{display:inline-flex;align-items:center;gap:11px;font-weight:700;font-size:22px;letter-spacing:-.025em;color:#fff;margin-bottom:14px}
.foot-brand:hover{color:#fff;text-decoration:none}
.foot-brand .mk{flex:none;display:block}
.foot-brand i{font-style:normal;color:#7fb4f2}
.foot-menu{list-style:none;margin:6px 0 0;padding:0}
.foot-menu li{margin-bottom:9px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.16)}
.foot-bottom .wrap{display:flex;flex-wrap:wrap;gap:10px 28px;justify-content:space-between;padding-block:18px;font-size:14.5px;color:#8fb0d8}

/* comments off, misc */
.screen-reader-text{position:absolute;left:-9999px}
.alignleft{float:left;margin:6px 20px 12px 0}
.alignright{float:right;margin:6px 0 12px 20px}
.aligncenter{display:block;margin:12px auto}
.wp-caption{max-width:100%}