/* Swamp Cooler Guide: mobile-first, system fonts, no external requests */
:root{
 --ink:#14232a;--ink-2:#3c4d55;--muted:#5f6f76;--line:#dde3e1;--bg:#fbfaf7;--card:#fff;
 --teal:#0f5c63;--teal-2:#0b474d;--teal-soft:#e4f2f0;--sand:#f5ecdc;--sun:#e39a2d;--sun-soft:#fdf2e0;
 --red:#a63a2a;--red-soft:#fbeae6;--green:#2c6e3f;--green-soft:#e6f3e9;
 --radius:12px;--shadow:0 1px 2px rgba(20,35,42,.06),0 4px 16px rgba(20,35,42,.06);
 --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
 --serif:Charter,"Bitstream Charter","Sitka Text",Cambria,Georgia,serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:5rem}
body{margin:0;font-family:var(--font);font-size:1.0625rem;line-height:1.65;color:var(--ink);background:var(--bg)}
img,svg{max-width:100%}
a{color:var(--teal);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--teal-2);text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px;border-radius:4px}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em;color:var(--ink)}
h1{font-size:clamp(1.85rem,5.5vw,2.75rem);margin:.2em 0 .35em}
h2{font-size:clamp(1.4rem,3.6vw,1.75rem);margin:2em 0 .6em}
h3{font-size:1.2rem;margin:1.6em 0 .4em}
p{margin:0 0 1em}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 1.1rem}
.narrow{max-width:820px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:100}
.skip:focus{left:.5rem;top:.5rem}
.muted{color:var(--muted)}
.ico{width:1.15em;height:1.15em;flex:none;vertical-align:-.2em}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(251,250,247,.96);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:1rem;min-height:3.75rem}
.brand{display:flex;align-items:center;gap:.55rem;text-decoration:none;color:var(--ink);font-size:1.08rem;letter-spacing:-.01em;white-space:nowrap}
.brand b{color:var(--teal)}
.logo-mark{width:2rem;height:2rem}
.main-nav{display:none;margin-left:auto}
.main-nav ul{display:flex;gap:.25rem;list-style:none;margin:0;padding:0}
.main-nav a{display:block;padding:.45rem .7rem;border-radius:8px;text-decoration:none;color:var(--ink-2);font-weight:550;font-size:.97rem}
.main-nav a:hover,.main-nav a[aria-current]{background:var(--teal-soft);color:var(--teal-2)}
.header-actions{display:flex;align-items:center;gap:.35rem;margin-left:auto}
.search-link{display:grid;place-items:center;width:2.6rem;height:2.6rem;border-radius:10px;color:var(--ink-2)}
.search-link:hover{background:var(--teal-soft)}
.topics-menu{position:relative}
.topics-menu summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:.5rem;padding:.5rem .7rem;border:1px solid var(--line);border-radius:10px;font-weight:600;font-size:.95rem;background:#fff;min-height:2.6rem}
.topics-menu summary::-webkit-details-marker{display:none}
.burger,.burger::before,.burger::after{display:block;width:16px;height:2px;background:var(--ink);border-radius:2px;position:relative}
.burger::before,.burger::after{content:"";position:absolute;left:0}
.burger::before{top:-5px}.burger::after{top:5px}
.topics-menu .label{display:none}
.topics-panel{position:absolute;right:0;top:calc(100% + .5rem);width:min(92vw,560px);background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 40px rgba(20,35,42,.18);padding:1rem}
.panel-title{margin:0 0 .5rem;font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700}
.topic-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr;gap:.15rem}
.topic-list a{display:flex;gap:.6rem;align-items:center;padding:.55rem .6rem;border-radius:8px;text-decoration:none;color:var(--ink);font-weight:550}
.topic-list a:hover{background:var(--teal-soft)}
.topic-list .ico{color:var(--teal)}
@media (min-width:560px){.topic-list{grid-template-columns:1fr 1fr}.topics-menu .label{display:inline}}
@media (min-width:980px){.main-nav{display:block}.header-actions{margin-left:0}}

/* breadcrumbs */
.crumbs ol{display:flex;flex-wrap:wrap;gap:.25rem;list-style:none;padding:0;margin:1rem 0 .5rem;font-size:.88rem;color:var(--muted)}
.crumbs li+li::before{content:"/";margin-right:.3rem;color:#a9b3b0}
.crumbs a{color:var(--muted)}

/* hero */
.hero{background:linear-gradient(160deg,#0f5c63 0%,#0b474d 55%,#173a3f 100%);color:#fff;padding:2.5rem 0 2.75rem;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-120px;width:380px;height:380px;border-radius:50%;background:radial-gradient(circle,rgba(242,180,90,.35),rgba(242,180,90,0) 70%)}
.hero-inner{display:grid;gap:2rem;position:relative;z-index:1}
.hero h1{color:#fff;font-size:clamp(2rem,6vw,3.1rem);max-width:16ch}
.hero .lede{color:#d8ecea;font-size:1.15rem;max-width:56ch}
.eyebrow{display:inline-flex;align-items:center;gap:.4rem;font-size:.8rem;text-transform:uppercase;letter-spacing:.09em;font-weight:700;color:var(--teal);text-decoration:none;margin:0 0 .35rem}
.eyebrow.light{color:#f2c27e}
.hero-cta{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.4rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;background:var(--sun);color:#1d1606;font-weight:700;text-decoration:none;padding:.8rem 1.15rem;border-radius:10px;border:0;font-size:1rem;cursor:pointer;min-height:2.9rem;font-family:inherit}
.btn:hover{background:#f0ab45;color:#1d1606}
.btn.ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.55)}
.btn.ghost:hover{background:rgba(255,255,255,.1)}
.btn.small{padding:.6rem .9rem;min-height:2.6rem;font-size:.95rem}
.quick-calc{background:#fff;color:var(--ink);border-radius:16px;padding:1.25rem;box-shadow:0 20px 50px rgba(0,0,0,.25);align-self:center}
.qc-title{font-weight:750;margin:0 0 .8rem;font-size:1.05rem}
.qc-row{display:flex;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:.6rem}
.qc-row label{font-size:.95rem;color:var(--ink-2)}
.qc-row input{width:6.5rem}
.qc-out{display:block;background:var(--teal-soft);border-radius:10px;padding:.75rem .9rem;margin:.6rem 0 .9rem;color:var(--teal-2)}
@media (min-width:860px){.hero{padding:4rem 0}.hero-inner{grid-template-columns:1.35fr 1fr;align-items:center}}

/* inputs */
input[type=number],input[type=search],input[type=text],select{font:inherit;font-size:1rem;padding:.6rem .7rem;border:1.5px solid #c6cfcc;border-radius:9px;background:#fff;color:var(--ink);min-height:2.75rem;width:100%}
input:focus,select:focus{border-color:var(--teal);outline:none;box-shadow:0 0 0 3px rgba(15,92,99,.18)}

/* sections & cards */
.section-h{font-size:1.4rem;margin:2.5rem 0 1rem}
.cards{list-style:none;margin:0;padding:0;display:grid;gap:1rem;grid-template-columns:1fr}
@media (min-width:640px){.cards{grid-template-columns:1fr 1fr}}
@media (min-width:1000px){.cards{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem 1.15rem;box-shadow:var(--shadow);position:relative;transition:border-color .15s,transform .15s}
.card:hover{border-color:#9cc9c4;transform:translateY(-1px)}
.card a{text-decoration:none;color:var(--ink)}
.card a::after{content:"";position:absolute;inset:0;border-radius:inherit}
.card-title{font-weight:700;font-size:1.06rem;line-height:1.3;display:block;margin-bottom:.35rem}
.card p{margin:0;color:var(--muted);font-size:.95rem;line-height:1.5}
.kicker{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.09em;font-weight:700;color:var(--sun);margin-bottom:.25rem}
.chips{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.5rem}
.chips a{display:inline-flex;align-items:center;gap:.4rem;padding:.5rem .85rem;border-radius:999px;background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--ink);font-weight:550;font-size:.95rem}
.chips a:hover{border-color:var(--teal);color:var(--teal)}
.chips.big a{padding:.7rem 1.05rem;font-size:1rem;background:var(--sand);border-color:#eadcc0}
.chips .ico{color:var(--teal)}
.topic-grid{list-style:none;margin:0;padding:0;display:grid;gap:.75rem;grid-template-columns:1fr}
@media (min-width:600px){.topic-grid{grid-template-columns:1fr 1fr}}
@media (min-width:1000px){.topic-grid{grid-template-columns:repeat(3,1fr)}}
.topic-grid a{display:grid;grid-template-columns:auto 1fr;column-gap:.75rem;row-gap:.15rem;padding:1rem;border-radius:var(--radius);background:#fff;border:1px solid var(--line);text-decoration:none;color:var(--ink);height:100%}
.topic-grid a:hover{border-color:var(--teal)}
.topic-grid .ico{grid-row:span 2;width:2.3rem;height:2.3rem;padding:.45rem;border-radius:10px;background:var(--teal-soft);color:var(--teal)}
.t-name{font-weight:700}
.t-desc{color:var(--muted);font-size:.92rem;line-height:1.45}
.feature{margin:3rem 0 1rem;background:var(--sand);border-radius:18px;padding:1.6rem;display:grid;gap:1.5rem}
.feature h2{margin-top:.2rem}
.feature-stats{margin:0;display:grid;gap:.75rem}
.feature-stats div{background:#fff;border-radius:12px;padding:.9rem 1rem}
.feature-stats dt{font-weight:700}
.feature-stats dd{margin:0;color:var(--ink-2)}
@media (min-width:860px){.feature{grid-template-columns:1.5fr 1fr;padding:2.2rem;align-items:center}}
.promise-grid{list-style:none;padding:0;margin:0 0 3rem;display:grid;gap:1rem}
.promise-grid li{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem}
@media (min-width:860px){.promise-grid{grid-template-columns:repeat(3,1fr)}}

/* hub */
.hub-head{padding:.5rem 0 .5rem;max-width:760px}
.lede{font-size:1.15rem;color:var(--ink-2)}
.start-here,.data-callout{background:var(--teal-soft);border:1px solid #bfdeda;border-radius:var(--radius);padding:1.2rem 1.3rem;margin:1rem 0 1.5rem;position:relative;max-width:820px}
.start-here a,.data-callout a{text-decoration:none;color:var(--ink)}
.start-here a::after,.data-callout a::after{content:"";position:absolute;inset:0}
.start-here p:last-child,.data-callout p:last-child{margin:0;color:var(--ink-2)}
.hub-prose{max-width:820px}
.other-topics{margin:2rem 0 3rem}

/* article */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr);column-gap:3rem}
.article-layout .crumbs,.article-layout .related{grid-column:1/-1}
@media (min-width:1040px){.article-layout{grid-template-columns:minmax(0,1fr) 300px}.sidebar{position:sticky;top:5rem;align-self:start;max-height:calc(100vh - 6rem);overflow:auto}}
.article{max-width:760px;min-width:0}
.article.wide{max-width:none}
.article-head{margin-bottom:1.2rem}
.dek{font-size:1.15rem;color:var(--ink-2);margin:.2rem 0 .8rem}
.byline{font-size:.9rem;color:var(--muted);margin:0}
.byline a{color:var(--ink-2)}
.answer{background:#fff;border:1px solid var(--line);border-left:5px solid var(--teal);border-radius:10px;padding:1rem 1.2rem;margin:1.2rem 0;box-shadow:var(--shadow)}
.answer p{margin:0}
.answer-label,.box-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.09em;font-weight:750;color:var(--teal);margin:0 0 .35rem !important}
.takeaways{background:var(--sun-soft);border-radius:10px;padding:1rem 1.2rem;margin:1.2rem 0}
.takeaways ul{margin:0;padding-left:1.2rem}
.takeaways li{margin:.25rem 0}
.takeaways .box-title{color:#94600f}
.toc{border:1px solid var(--line);border-radius:10px;background:#fff;margin:1.2rem 0;padding:.2rem 1.1rem}
.toc summary{cursor:pointer;font-weight:700;padding:.6rem 0}
.toc ol{margin:0 0 .8rem;padding-left:1.25rem;font-size:.97rem}
.toc li{margin:.25rem 0}
.prose{font-family:var(--serif);font-size:1.125rem;line-height:1.7}
.prose h2,.prose h3,.prose table,.prose .callout,.prose .formula,.prose dl,.prose .example,.prose ol.steps{font-family:var(--font)}
.prose h2{padding-top:.4rem;border-top:1px solid var(--line)}
.prose ul,.prose ol{padding-left:1.4rem;margin:0 0 1.1em}
.prose li{margin:.35em 0}
.prose strong{font-weight:700}
.callout{border-radius:10px;padding:.9rem 1.1rem;margin:1.4rem 0;font-size:1rem;line-height:1.6}
.callout p:last-child{margin:0}
.callout.tip{background:var(--green-soft);border-left:4px solid var(--green)}
.callout.warn{background:var(--red-soft);border-left:4px solid var(--red)}
.callout.note{background:var(--teal-soft);border-left:4px solid var(--teal)}
.formula{background:#102a2e;color:#e6f6f3;border-radius:10px;padding:.9rem 1.1rem;margin:1.2rem 0;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.95rem;overflow-x:auto}
.example{border:1.5px dashed #b9cfcb;border-radius:10px;padding:1rem 1.2rem;margin:1.4rem 0;background:#fff;font-size:1.02rem}
.example-title{font-weight:750;color:var(--teal-2);margin-bottom:.4rem}
.example p:last-child{margin:0}
ol.steps{list-style:none;counter-reset:s;padding:0;font-size:1.02rem}
ol.steps>li{counter-increment:s;position:relative;padding:.1rem 0 .6rem 2.8rem;margin:0 0 .5rem;border-bottom:1px solid #eef1ef}
ol.steps>li::before{content:counter(s);position:absolute;left:0;top:0;width:2rem;height:2rem;border-radius:50%;background:var(--teal);color:#fff;font-weight:700;display:grid;place-items:center;font-size:.92rem}
dl.specs{display:grid;grid-template-columns:minmax(8rem,max-content) 1fr;gap:.35rem 1rem;background:#fff;border:1px solid var(--line);border-radius:10px;padding:.9rem 1.1rem;font-size:1rem}
dl.specs dt{font-weight:700}
dl.specs dd{margin:0}
.table-wrap{overflow-x:auto;margin:1.4rem 0;border:1px solid var(--line);border-radius:10px;background:#fff;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:.95rem;line-height:1.45}
caption{caption-side:top;text-align:left;padding:.75rem .9rem;font-weight:650;color:var(--ink-2);font-size:.92rem}
th,td{text-align:left;padding:.6rem .8rem;border-top:1px solid var(--line);vertical-align:top}
thead th{background:#f2f5f4;font-weight:700;border-top:0;white-space:nowrap}
tbody tr:nth-child(even){background:#fafbfa}
.faq details{border:1px solid var(--line);border-radius:10px;background:#fff;margin:.6rem 0}
.faq summary{cursor:pointer;padding:.85rem 1.1rem;list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--teal);line-height:1}
.faq details[open] summary::after{content:"\2212"}
.faq summary h3{margin:0;font-size:1.05rem;font-weight:650}
.faq details>div{padding:0 1.1rem .9rem}
.faq details>div p{margin:0}
.sources ol{font-size:.95rem;padding-left:1.3rem}
.sources li{margin:.3rem 0}
.trust{margin:2rem 0;padding:1rem 1.2rem;border-radius:10px;background:#f2f5f4;font-size:.95rem}
.trust p{margin:0}
.sidebar{font-size:.95rem;margin-top:2rem}
@media (min-width:1040px){.sidebar{margin-top:0}}
.cluster-nav,.side-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.1rem;margin-bottom:1rem}
.cluster-nav ul,.side-box ul{list-style:none;padding:0;margin:0}
.cluster-nav li,.side-box li{padding:.35rem 0;border-bottom:1px solid #eef1ef;line-height:1.35}
.cluster-nav li:last-child,.side-box li:last-child{border:0}
.cluster-nav a,.side-box a{text-decoration:none}
.cluster-nav a:hover,.side-box a:hover{text-decoration:underline}
.more{display:inline-block;margin-top:.5rem;font-weight:650}
.related{margin:1rem 0 3rem}

/* calculators */
.calc{background:#fff;border:1px solid var(--line);border-radius:16px;padding:1.2rem;box-shadow:var(--shadow);margin:1.2rem 0 1.5rem;font-family:var(--font);font-size:1rem}
.calc-grid{display:grid;gap:.9rem;grid-template-columns:1fr}
@media (min-width:600px){.calc-grid{grid-template-columns:1fr 1fr}}
.calc label{display:block;font-weight:650;margin-bottom:.3rem;font-size:.95rem}
.calc .hint{display:block;font-weight:400;color:var(--muted);font-size:.85rem;margin-top:.25rem}
.calc fieldset{border:0;padding:0;margin:0}
.calc legend{font-weight:650;margin-bottom:.4rem;font-size:.95rem}
.result{margin-top:1.2rem;border-radius:12px;background:var(--teal-soft);padding:1.1rem 1.2rem}
.result .big{font-size:2rem;font-weight:800;color:var(--teal-2);line-height:1.1;margin:0 0 .3rem}
.result p{margin:.3rem 0}
.result dl{display:grid;grid-template-columns:1fr auto;gap:.3rem 1rem;margin:.8rem 0 0}
.result dt{color:var(--ink-2)}
.result dd{margin:0;font-weight:700;text-align:right}
.verdict{display:inline-block;padding:.2rem .6rem;border-radius:999px;font-weight:700;font-size:.9rem}
.v-ex,.r-ex{background:var(--green-soft);color:var(--green)}
.v-good,.r-good{background:#eef6d9;color:#4f6b12}
.v-marg,.r-marg{background:var(--sun-soft);color:#8a5a0c}
.v-poor,.r-poor{background:var(--red-soft);color:var(--red)}
.rating{display:inline-block;padding:.1rem .5rem;border-radius:999px;font-weight:700;font-size:.85rem;white-space:nowrap}
.index-table td:nth-child(n+2):nth-child(-n+6){font-variant-numeric:tabular-nums;text-align:right}
.filter-row{display:flex;flex-wrap:wrap;gap:.6rem;align-items:end;font-family:var(--font);font-size:.95rem}
.filter-row label{font-weight:650}
.filter-row select{width:auto}

/* search */
.search-form{display:flex;gap:.5rem;margin:1rem 0}
.search-results{list-style:none;padding:0}
.search-results li{padding:.9rem 0;border-bottom:1px solid var(--line)}
.search-results a{font-weight:700;font-size:1.08rem}
.search-results p{margin:.2rem 0 0;color:var(--muted);font-size:.95rem}
.sitemap-grid{display:grid;gap:1.5rem;grid-template-columns:1fr;margin-bottom:3rem}
@media (min-width:760px){.sitemap-grid{grid-template-columns:1fr 1fr}}
@media (min-width:1100px){.sitemap-grid{grid-template-columns:repeat(3,1fr)}}
.sitemap-grid h2{font-size:1.15rem;margin:0 0 .4rem}
.sitemap-grid ul{padding-left:1.1rem;margin:0}
.notfound{padding:3rem 1.1rem 4rem}
dl.glossary dt{font-weight:750;margin-top:1rem;font-family:var(--font);scroll-margin-top:5rem}
dl.glossary dd{margin:.2rem 0 0}
dl.glossary dt:target{background:var(--sun-soft)}

/* footer */
.site-footer{background:#102a2e;color:#c5d6d4;margin-top:3rem;font-size:.95rem}
.site-footer a{color:#e8f3f1;text-decoration:none}
.site-footer a:hover{text-decoration:underline}
.footer-grid{display:grid;gap:2rem;padding:2.5rem 1.1rem 1.5rem}
@media (min-width:860px){.footer-grid{grid-template-columns:1.2fr 2fr 1fr}}
.brand-footer{color:#fff;margin-bottom:.7rem}
.brand-footer b{color:#9fe0dc}
.footer-h{font-weight:700;color:#fff;margin-bottom:.5rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{padding:.2rem 0}
.footer-topics{columns:2;column-gap:1.5rem}
.footer-base{border-top:1px solid rgba(255,255,255,.12);padding:1rem 1.1rem 2rem;font-size:.85rem;color:#9fb4b1}
@media print{.site-header,.site-footer,.sidebar,.related,.toc{display:none}}
@media (prefers-reduced-motion:reduce){*{transition:none !important;scroll-behavior:auto !important}}