@charset "utf-8";
:root{--ink:#325d71;--text:#3a596a;--muted:#607d8b;--line:#c9dce1;--mist:#eef6f8;--paper:#f9fcfd;--blue:#dfeef2;--aqua:#cce8e5;--accent:#e96950;--accent-hover:#d95b42;--white:#fff;--width:1280px;--round:13px}
*{box-sizing:border-box}
html{scroll-behavior:auto}
body{margin:0;background:var(--paper);color:var(--text);font:16px/1.68 system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--ink);text-decoration-color:#78aab7;text-underline-offset:3px}
a:hover{color:#bf523b;text-decoration-color:currentColor}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{outline:3px solid #df684e;outline-offset:3px}
button,input{font:inherit}
button{cursor:pointer}
h1,h2,h3,p,ol,ul{margin-top:0}
h1{font-size:40px;line-height:1.16;letter-spacing:-.045em;color:var(--ink);font-weight:780}
h2{font-size:28px;line-height:1.26;letter-spacing:-.028em;color:var(--ink);font-weight:730}
h3{font-size:20px;color:var(--ink)}
p{font-size:16px;line-height:1.7}
.wrap{width:calc(100% - 64px);max-width:var(--width);margin-inline:auto}
.skip-link{position:fixed;top:-100px;left:16px;z-index:100;background:var(--ink);color:white;padding:8px 16px}
.skip-link:focus{top:12px;color:white}
.site-header{background:var(--white);border-bottom:1px solid var(--line)}
.site-header__main{min-height:84px;display:flex;align-items:center;gap:26px;justify-content:space-between}
.wordmark{display:flex;flex:0 0 auto;align-items:center;gap:10px;font-size:21px;font-weight:850;line-height:1;letter-spacing:-.065em;text-decoration:none;color:var(--ink)}
.wordmark small{display:block;font-size:10px;letter-spacing:.3em;margin-top:6px;font-weight:750}
.wordmark__mark{width:41px;height:42px;display:grid;place-items:center;border-radius:10px;background:var(--ink)}
.wordmark__mark::before{content:"";display:block;width:21px;height:21px;border:3px solid var(--white);border-radius:50%;box-shadow:inset 0 0 0 3px #75b9bc}
.main-nav{display:flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.main-nav a,.sub-nav a{color:var(--ink);text-decoration:none;white-space:nowrap}
.main-nav a{padding:7px 12px;font-size:14px;font-weight:650;border-radius:7px}
.main-nav a:hover,.main-nav a[aria-current=page]{background:var(--mist)}
.sub-nav{display:flex;align-items:center;flex-wrap:wrap;gap:2px 24px;padding:12px 0 15px;border-top:1px solid var(--line)}
.sub-nav a{font-size:13px;font-weight:600;padding:2px 0;color:var(--muted)}
.sub-nav a:hover,.sub-nav a[aria-current=page]{color:var(--accent)}
.mobile-nav{display:none}
.hero{background:linear-gradient(135deg,#e7f2f3 0%,#f2faf9 65%,#deeff1 100%);border-bottom:1px solid var(--line)}
.hero--front{background:linear-gradient(124deg,#e0f0f1 0%,#f1faf8 60%,#d8eaf0 100%)}
.hero--answer{background:linear-gradient(120deg,#e7f3f6 0%,#f4f9fa 50%,#e3efec 100%)}
.hero__inner{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:42px;align-items:stretch;padding-top:54px;padding-bottom:52px}
.hero__copy{display:flex;flex-direction:column;align-items:flex-start;justify-content:center}
.eyebrow{font-size:12px;color:#578392;font-weight:800;letter-spacing:.17em;line-height:1.5;margin-bottom:22px}
.hero h1{max-width:720px;margin-bottom:25px}
.hero__lead{font-size:19px;line-height:1.58;color:#496b79;margin-bottom:25px;max-width:730px}
.hero__actions{display:flex;align-items:center;flex-wrap:wrap;gap:11px}
.button{text-decoration:none;display:inline-flex;align-items:center;justify-content:center;min-height:46px;font-size:14px;font-weight:750;padding:10px 17px;border-radius:8px;transition:background .12s,border-color .12s}
.button--primary{background:var(--accent);color:var(--white)}
.button--primary:hover{background:var(--accent-hover);color:var(--white)}
.button--quiet{background:rgba(255,255,255,.65);border:1px solid #afcbd0}
.button--quiet:hover{background:var(--white)}
.hero__aside{position:relative;border:1px solid #bbd7dc;border-radius:var(--round);background:rgba(255,255,255,.74);padding:22px 25px 22px;align-self:center;overflow:hidden}
.aside-label{font-size:12px;font-weight:800;color:#6a939e;letter-spacing:.13em;text-transform:uppercase;margin-bottom:12px}
.facts{list-style:none;margin:0;padding:0}
.facts li{display:grid;grid-template-columns:68px 1fr;gap:9px;padding:11px 0;border-top:1px solid #d1e3e6}
.fact-id{font-size:25px;line-height:1.16;font-weight:800;letter-spacing:-.045em;color:var(--accent);white-space:nowrap}
.facts strong{display:block;color:var(--ink);font-size:15px;line-height:1.4;margin-bottom:3px}
.facts p{font-size:14px;line-height:1.51;margin:0;color:#587582}
.appliance{position:absolute;right:-38px;bottom:-45px;opacity:.095;width:180px;height:190px;border:9px solid var(--ink);border-radius:24px;transform:rotate(-8deg);pointer-events:none}
.appliance__top{height:32px;border-bottom:7px solid var(--ink);display:flex;gap:10px;padding:7px 14px}
.appliance__top span{width:10px;height:10px;border:3px solid var(--ink);border-radius:50%}
.appliance__door{width:107px;height:107px;margin:13px auto;border:10px solid var(--ink);border-radius:50%;display:grid;place-items:center}
.appliance__door span{width:65px;height:65px;border:3px solid var(--ink);border-radius:50%}
.body-content{padding-top:8px;padding-bottom:56px}
.essay-section,.evidence-table,.related,.calculator{padding:43px 0;border-bottom:1px solid var(--line)}
.section-heading{display:flex;align-items:flex-start;gap:16px;margin-bottom:22px}
.section-heading h2{margin:0}
.section-number{flex:0 0 36px;width:36px;height:33px;border-radius:5px;display:grid;place-items:center;background:var(--aqua);color:#407884;font-size:12px;font-weight:800}
.essay-columns{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:38px}
.essay-columns p{margin:0;font-size:16px;line-height:1.78}
.essay-columns a{font-weight:400;text-decoration-thickness:1px}
.research-number{margin-top:24px;background:var(--mist);border-left:5px solid var(--accent);display:flex;align-items:center;gap:22px;padding:13px 20px;border-radius:0 8px 8px 0}
.research-number strong{font-size:28px;line-height:1.2;font-weight:850;color:var(--ink);white-space:nowrap}
.research-number p{font-size:15px;margin:0}
.evidence-table table{width:100%;border-collapse:collapse;table-layout:fixed;text-align:left;border-top:2px solid #86b8bd}
.evidence-table thead{background:var(--blue)}
.evidence-table th{font-size:13px;color:var(--ink);font-weight:800;padding:14px 17px}
.evidence-table td{font-size:15px;line-height:1.52;padding:15px 17px;border-bottom:1px solid var(--line);vertical-align:top}
.evidence-table td:first-child{color:var(--ink);font-weight:720}
.evidence-table tbody tr:nth-child(even){background:#f0f7f8}
.related__links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.related__links a{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--white);border:1px solid var(--line);border-radius:7px;min-height:53px;padding:10px 17px;text-decoration:none;font-weight:670;font-size:15px;color:var(--ink)}
.related__links a:hover{border-color:#7aa9b2;background:#f1faf9}
.related__links a span:last-child{font-size:24px;font-weight:400;color:var(--accent)}
.sources{padding:28px 0 12px}
.sources h2{font-size:28px;margin-bottom:10px}
.sources ol{padding-left:20px;margin:0}
.sources li{font-size:13px;line-height:1.66;color:#58727d;margin:8px 0}
.site-footer{background:#dfeff2;border-top:1px solid var(--line)}
.site-footer__inner{min-height:96px;display:flex;justify-content:space-between;align-items:center;gap:20px}
.site-footer p{font-size:14px;font-weight:800;margin:0;color:var(--ink)}
.site-footer nav{display:flex;gap:22px;flex-wrap:wrap}
.site-footer nav a{font-size:13px;font-weight:650;text-decoration:none}
.calculator{background:linear-gradient(115deg,#eef7f6,#e5f1f3);margin-top:28px;padding:26px 24px;border:1px solid #bdd5db;border-radius:10px}
.cost-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 20px}
.cost-form label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:700;color:var(--ink)}
.cost-form input{width:100%;height:47px;background:white;border:1px solid #a8c5cc;border-radius:6px;padding:9px 12px;color:var(--ink)}
.cost-action{display:flex;gap:20px;align-items:center;grid-column:1/-1;padding-top:8px;flex-wrap:wrap}
.cost-action button{border:0;color:white;background:var(--accent);padding:11px 18px;border-radius:7px;font-weight:750}
.cost-action button:hover{background:var(--accent-hover)}
.cost-action output{color:var(--ink);font-size:22px;font-weight:820;line-height:1.35}
@media(max-width:1170px){.wrap{width:calc(100% - 48px)}.hero__inner{gap:26px;grid-template-columns:minmax(0,1fr) minmax(0,.9fr)}.main-nav a{padding:7px 8px;font-size:13px}.sub-nav{gap:4px 17px}.hero__aside{padding:18px}}
@media(max-width:930px){.main-nav,.sub-nav{display:none}.site-header__main{min-height:70px}.mobile-nav{display:block;position:relative;margin-left:auto}.mobile-nav summary{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:8px 13px;border:1px solid #a9c5cd;border-radius:7px;color:var(--ink);font-weight:780;cursor:pointer;list-style:none}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-nav summary span{font-size:18px}.mobile-nav[open] summary{background:var(--mist)}.mobile-nav nav{position:absolute;right:0;top:calc(100% + 9px);width:min(330px,calc(100vw - 48px));z-index:50;display:grid;padding:10px;background:var(--white);border:1px solid var(--line);border-radius:10px;box-shadow:0 15px 25px #7294a42a;max-height:calc(100dvh - 90px);overflow-y:auto}.mobile-nav nav a{padding:8px 11px;text-decoration:none;border-radius:6px;font-size:15px;font-weight:650}.mobile-nav nav a[aria-current=page],.mobile-nav nav a:hover{background:var(--mist)}.hero__inner{grid-template-columns:1fr;gap:25px;padding-top:38px;padding-bottom:36px}.hero__copy{display:block}.hero h1{max-width:780px}.hero__aside{display:block}.facts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.facts li{display:flex;flex-direction:column;gap:8px;border-top:0;border-left:1px solid #d1e3e6;padding:3px 0 3px 12px}.fact-id{font-size:23px}.appliance{width:130px;height:130px}.essay-columns{gap:24px}}
@media(max-width:670px){.wrap{width:calc(100% - 32px)}.hero__inner{padding-top:32px;padding-bottom:33px}.hero__lead{font-size:18px}.eyebrow{font-size:11px;margin-bottom:18px}.hero h1{margin-bottom:20px;overflow-wrap:anywhere}.hero__aside{padding:18px}.facts{grid-template-columns:1fr;gap:0}.facts li{display:grid;grid-template-columns:70px 1fr;padding:9px 0;border-top:1px solid #d1e3e6;border-left:0}.essay-section,.evidence-table,.related,.calculator{padding:30px 0}.essay-columns{grid-template-columns:1fr;gap:14px}.section-heading{gap:12px;margin-bottom:16px}.section-number{flex-basis:30px;width:30px}.research-number{align-items:flex-start;gap:10px;flex-direction:column}.related__links{grid-template-columns:1fr}.evidence-table table,.evidence-table tbody,.evidence-table tr,.evidence-table td{display:block;width:100%}.evidence-table thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.evidence-table tr{border:1px solid var(--line);border-radius:7px;margin-bottom:10px;background:white;overflow:hidden}.evidence-table td{border-bottom:1px solid #dce9eb;padding:9px 12px;font-size:15px}.evidence-table td:last-child{border-bottom:0}.evidence-table td::before{content:attr(data-label);display:block;font-size:11px;text-transform:uppercase;color:#6f909a;letter-spacing:.05em;font-weight:800;margin-bottom:3px}.site-footer__inner{padding:21px 0;min-height:0;align-items:flex-start;flex-direction:column;gap:10px}.cost-form{grid-template-columns:1fr}.calculator{padding:20px 16px}.cost-action{align-items:flex-start;flex-direction:column;gap:13px}}
@media(max-width:370px){.wordmark{font-size:19px}.wordmark__mark{height:36px;width:36px}.hero__actions{flex-direction:column;align-items:stretch}.button{width:100%}.fact-id{font-size:22px}.related__links a{font-size:14px}.site-footer nav{gap:10px 17px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}