:root{--bg:#fff;--bg-soft:#f4f7f8;--ink:#12242b;--ink-soft:#405158;--muted:#6b7b80;--line:#dce5e7;--line-strong:#c4d1d4;--accent:#0b596b;--accent-hover:#083f4d;--accent-soft:#e5f2f4;--orange:#ed9b42;--danger:#8a1f1f;--white:#fff;--topbar:#092f3b;--footer:#102b33;--footer-text:#c4d1d4;--radius:6px;--content:1200px;--font:"Source Sans 3", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--display:"DM Sans", "Segoe UI", Roboto, Arial, sans-serif}*,:before,:after{box-sizing:border-box}html{background:var(--bg);scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;margin:0;font-size:17px;line-height:1.7}img,svg{max-width:100%;display:block}a{color:var(--accent);text-underline-offset:.15em;text-decoration-thickness:1px}a:hover{color:var(--accent-hover)}:focus-visible{outline:3px solid var(--orange);outline-offset:3px}h1,h2,h3,h4{font-family:var(--display);color:var(--ink);letter-spacing:-.025em;font-weight:700;line-height:1.2}h1{margin:0 0 .6rem;font-size:clamp(2rem,4.5vw,3.8rem)}h2{margin:2rem 0 .7rem;font-size:clamp(1.45rem,2.6vw,2rem)}h3{margin:1.45rem 0 .4rem;font-size:1.15rem}p{margin:0 0 1rem}ul,ol{margin:0 0 1.1rem;padding-left:1.2rem}li+li{margin-top:.28rem}code{background:var(--bg-soft);border:1px solid var(--line);border-radius:3px;padding:.05em .35em;font-size:.9em}table{border-collapse:collapse;width:100%;margin:0 0 1.25rem;font-size:.95rem}th,td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:.5rem .65rem}th{background:var(--bg-soft);font-weight:650}.skip{position:absolute;top:0;left:-999px}.skip:focus{z-index:80;background:var(--white);padding:.45rem .7rem;top:12px;left:12px}.wrap{width:min(var(--content), calc(100% - 3rem));margin-inline:auto}.top-bar{background:var(--topbar);color:#d9e5e7;font-size:.8rem}.top-bar-inner{justify-content:space-between;align-items:center;gap:1rem;min-height:36px;padding:.25rem 0;display:flex}.top-bar a{color:#fff;font-weight:600;text-decoration:none}.top-bar a:hover{color:#fff;text-decoration:underline}.top-dot{background:var(--orange);border-radius:50%;width:7px;height:7px;margin:0 .45rem .05rem 0;display:inline-block}.site-header{background:var(--white);box-shadow:0 1px #092f3b14}.inside-header{justify-content:space-between;align-items:center;gap:1.25rem;padding:1rem 0;display:flex}.brand{color:var(--ink);align-items:center;min-width:0;text-decoration:none;display:flex}.brand:hover{color:var(--ink)}.brand-logo{object-fit:contain;width:clamp(220px,24vw,275px);height:auto}.nav-drop{margin:0 auto}.nav-drop summary{cursor:pointer;border:1px solid var(--line);border-radius:var(--radius);padding:.35rem .55rem;font-size:.9rem;font-weight:650;list-style:none}.nav-drop summary::-webkit-details-marker{display:none}.site-nav{align-items:center;gap:1.15rem;display:flex}.site-nav a{color:var(--ink-soft);font-size:.88rem;font-weight:600;text-decoration:none}.site-nav a:hover,.site-nav a[aria-current=page]{color:var(--accent)}.header-cta,.button{border-radius:var(--radius);font-family:var(--display);white-space:nowrap;justify-content:center;align-items:center;gap:.4rem;font-weight:700;text-decoration:none;display:inline-flex}.header-cta{background:var(--accent);color:#fff;padding:.55rem .85rem;font-size:.84rem}.header-cta:hover{background:var(--accent-hover);color:#fff}.button{min-height:44px;padding:.65rem 1rem}.button-primary{background:var(--orange);color:#1d2b2d}.button-primary:hover{color:#1d2b2d;background:#f2b15f}.button-quiet{color:#fff;border:1px solid #ffffff59}.button-quiet:hover{color:#fff;background:#ffffff1a}.button-light{color:var(--accent);background:#fff}.button-light:hover{background:var(--accent-soft);color:var(--accent-hover)}.eyebrow,.kicker{color:var(--accent);letter-spacing:.13em;text-transform:uppercase;margin:0 0 .45rem;font-size:.7rem;font-weight:700;line-height:1.3;display:inline-block}.home-hero{isolation:isolate;color:#fff;background:#092f3b url(/water-heater-answers-hero.webp) 50%/cover no-repeat;position:relative;overflow:hidden}.home-hero:before{z-index:-1;content:"";background:linear-gradient(90deg,#041f27f7 0%,#041f27e0 34%,#041f2785 64%,#041f274d 100%);position:absolute;inset:0}.home-hero:after{z-index:-1;content:"";pointer-events:none;background:linear-gradient(#ffffff14,#0000 65%,#041f275c);position:absolute;inset:0}.home-hero-grid{grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);align-items:center;gap:4rem;min-height:550px;padding:5.2rem 0;display:grid}.hero-copy h1{color:#fff;max-width:700px;font-size:clamp(2.45rem,5vw,4.35rem)}.hero-copy .eyebrow,.home-hero .eyebrow{color:#b9e3e8}.hero-lede{color:#dceff1;max-width:620px;font-size:1.15rem;line-height:1.55}.hero-actions{flex-wrap:wrap;gap:.7rem;margin:1.55rem 0 1rem;display:flex}.hero-proof{color:#b9d7da;margin:0;font-size:.87rem}.hero-proof span{color:var(--orange);margin-right:.3rem;font-weight:700}.hero-route{backdrop-filter:blur(7px);background:#041f27c2;border:0;border-radius:16px;padding:1.5rem;box-shadow:0 18px 45px #0003}.hero-route-label{color:#b9e3e8;letter-spacing:.13em;text-transform:uppercase;margin:0 0 1.25rem;font-size:.72rem;font-weight:700}.route-step{align-items:flex-start;gap:.9rem;display:flex}.route-step>span{color:var(--orange);font-family:var(--display);padding-top:.15rem;font-size:.75rem;font-weight:700}.route-step strong,.route-step small{display:block}.route-step strong{color:#fff;font-family:var(--display);font-size:1rem}.route-step small{color:#b9d7da;font-size:.9rem}.route-line{background:#ffffff4d;width:1px;height:24px;margin:.25rem 0 .25rem .22rem}.home-explainer{grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr);align-items:center;gap:4rem;display:grid}.explainer-copy{max-width:650px}.explainer-copy h2{margin:0 0 .8rem;font-size:clamp(1.7rem,3vw,2.35rem)}.explainer-copy p{color:var(--ink-soft);max-width:620px}.explainer-copy .text-link{margin-top:.25rem;display:inline-block}.explainer-panel{background:var(--bg-soft);border-radius:16px;padding:1.5rem 1.6rem}.panel-label{color:var(--accent);letter-spacing:.12em;text-transform:uppercase;margin:0 0 1.15rem;font-size:.72rem;font-weight:700}.diagnosis-list{counter-reset:diagnosis;gap:1.1rem;margin:0;padding:0;list-style:none;display:grid}.diagnosis-list li{counter-increment:diagnosis;grid-template-columns:2rem 1fr;align-items:start;gap:.7rem;display:grid}.diagnosis-list li:before{background:var(--accent);color:#fff;content:counter(diagnosis, decimal-leading-zero);width:2rem;height:2rem;font-family:var(--display);border-radius:50%;place-items:center;font-size:.7rem;font-weight:700;display:grid}.diagnosis-list strong,.diagnosis-list span{display:block}.diagnosis-list strong{color:var(--ink);font-family:var(--display);font-size:1rem}.diagnosis-list span{color:var(--ink-soft);margin-top:.08rem;font-size:.92rem;line-height:1.4}.home-library-overview{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:start;gap:4rem;display:grid}.overview-intro{max-width:560px}.overview-intro h2{margin:0 0 .8rem;font-size:clamp(1.7rem,3vw,2.35rem)}.overview-intro p{color:var(--ink-soft)}.overview-intro .text-link{margin-top:.25rem;display:inline-block}.overview-topics{grid-template-columns:repeat(2,1fr);gap:1.4rem 1.1rem;display:grid}.overview-topics article{background:var(--bg-soft);border-radius:14px;padding:1.15rem 1.2rem}.overview-topics h3{margin:0 0 .45rem;font-size:1.08rem}.overview-topics p{color:var(--ink-soft);margin:0 0 .55rem;font-size:.92rem;line-height:1.5}.overview-topics .text-link{font-size:.8rem}.home-section{padding:4.8rem 0 0}.section-heading{justify-content:space-between;align-items:end;gap:1rem;margin-bottom:1.5rem;display:flex}.section-heading h2{border:0;margin:0;padding:0}.text-link{font-family:var(--display);font-size:.86rem;font-weight:700;text-decoration:none}.text-link span{margin-left:.2rem}.symptom-grid{grid-template-columns:repeat(3,1fr);gap:.85rem;display:grid}.symptom-card{background:var(--bg-soft);min-height:98px;color:var(--ink);border-radius:10px;grid-template-columns:auto 1fr auto;align-items:center;gap:.8rem;padding:1rem;text-decoration:none;transition:box-shadow .15s,transform .15s,background .15s;display:grid}.symptom-card:hover{color:var(--ink);background:#fff;transform:translateY(-2px);box-shadow:0 10px 24px #092f3b1a}.symptom-icon{background:var(--accent-soft);width:39px;height:39px;color:var(--accent);font-family:var(--display);border-radius:50%;place-items:center;font-size:1.15rem;font-weight:700;display:grid}.symptom-card strong,.symptom-card small{display:block}.symptom-card strong{font-family:var(--display);font-size:1rem}.symptom-card small{color:var(--muted);margin-top:.15rem;font-size:.84rem;line-height:1.3}.card-arrow{color:var(--accent);font-size:1.15rem}.category-section{padding-top:4.2rem}.category-grid{grid-template-columns:repeat(5,1fr);gap:.85rem;display:grid}.category-card{background:var(--bg-soft);border-radius:var(--radius);min-height:225px;color:var(--ink);border:1px solid #0000;padding:1.15rem;text-decoration:none}.category-card:hover{border-color:var(--line-strong);color:var(--ink);background:#fff}.category-card h3{margin:.35rem 0 .5rem;font-size:1.18rem}.category-card p{color:var(--ink-soft);min-height:82px;font-size:.92rem;line-height:1.45}.category-count{color:var(--accent);letter-spacing:.08em;text-transform:uppercase;font-size:.71rem;font-weight:700}.featured-section{padding-bottom:4.8rem}.home-layout{grid-template-columns:minmax(0,1fr) 300px}.featured-list{grid-template-columns:repeat(2,1fr);align-content:start;gap:1rem;display:grid}.featured-item{background:var(--bg-soft);color:inherit;border-radius:10px;padding:1.25rem;text-decoration:none;transition:box-shadow .15s,transform .15s;display:block}.featured-item:hover{transform:translateY(-2px);box-shadow:0 10px 24px #092f3b14}.featured-item h3{margin:.25rem 0 .35rem;font-size:1.22rem}.featured-item p{color:var(--ink-soft);margin:0;font-size:.93rem;line-height:1.5}.featured-item:hover h3{color:var(--accent)}.read-more{color:var(--accent);font-family:var(--display);margin-top:.55rem;font-size:.82rem;font-weight:700;display:inline-block}.chip{color:var(--accent);text-transform:uppercase;letter-spacing:.08em;font-size:.7rem;font-weight:700;text-decoration:none}.home-callout{background:var(--accent-soft);margin-top:0}.callout-inner{justify-content:space-between;align-items:center;gap:2rem;padding:2.4rem 0;display:flex}.callout-inner h2{border:0;margin:0 0 .35rem;padding:0;font-size:1.55rem}.callout-inner p:last-child{color:var(--ink-soft);max-width:650px;margin:0}.callout-inner .eyebrow{margin-bottom:.3rem}.home-lead-section{padding-top:3.3rem;padding-bottom:4.5rem}.home-faq{padding-bottom:4.8rem}.faq-list{grid-template-columns:repeat(2,1fr);gap:.75rem;display:grid}.faq-list details{background:var(--bg-soft);border-radius:12px;padding:1rem 1.1rem}.faq-list summary{cursor:pointer;color:var(--ink);font-family:var(--display);padding-right:1.5rem;font-weight:700;list-style:none;position:relative}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary:after{color:var(--accent);content:"+";font-size:1.25rem;line-height:1;position:absolute;top:0;right:0}.faq-list details[open] summary:after{content:"−"}.faq-list details p{color:var(--ink-soft);margin:.7rem 0 0;font-size:.94rem;line-height:1.5}.page-header{background:linear-gradient(180deg, var(--bg-soft), #fff);padding:2.3rem 0 .35rem}.page-header .lede{color:var(--ink-soft);max-width:45rem;margin-bottom:1.1rem;font-size:1.06rem}.breadcrumbs{color:var(--muted);margin:0 0 .75rem;font-size:.82rem}.breadcrumbs a{color:var(--muted);text-decoration:none}.breadcrumbs a:hover{color:var(--accent)}.breadcrumbs span{color:#aebcc0;margin:0 .35rem}.site-content{padding:1.5rem 0 4.5rem}.layout{grid-template-columns:minmax(0,1fr) 300px;align-items:start;gap:3.2rem;display:grid}.article-body{min-width:0;max-width:800px}.article-body>p:first-of-type{background:var(--accent-soft);border-radius:8px;margin:0 0 1.3rem;padding:.9rem 1rem}.article-body h2{scroll-margin-top:1rem}.article-body h3{color:var(--accent-hover)}.entry-meta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:.35rem .9rem;margin:0 0 1.25rem;font-size:.84rem;display:flex}.post-list{gap:.8rem;padding-bottom:2rem;display:grid}.category-toolbar{color:var(--muted);justify-content:space-between;align-items:center;gap:1rem;padding:.2rem 0 .9rem;font-size:.88rem;display:flex}.category-toolbar p{margin:0}.post-item{background:var(--bg-soft);color:inherit;border-radius:10px;padding:1.35rem;text-decoration:none;transition:box-shadow .15s,transform .15s;display:block}.post-item:hover{transform:translateY(-2px);box-shadow:0 10px 24px #092f3b14}.post-item h2{border:0;margin:.15rem 0 .4rem;padding:0;font-size:1.28rem}.post-item:hover h2{color:var(--accent)}.post-item p{color:var(--ink-soft);margin:0;font-size:.98rem}.widget-area{flex-direction:column;gap:1.35rem;display:flex}.widget{background:var(--bg-soft);border-radius:10px;padding:1rem 1.05rem 1.1rem}.widget h2,.widget-title{letter-spacing:.1em;text-transform:uppercase;border-bottom:2px solid var(--accent);margin:0 0 .7rem;padding:0 0 .45rem;font-size:.75rem;font-weight:700}.widget ul{margin:0;padding:0;list-style:none}.widget li{border-bottom:1px solid var(--line);margin:0}.widget li:last-child{border-bottom:0}.widget a{color:var(--ink);padding:.4rem 0;font-size:.92rem;text-decoration:none;display:block}.widget a:hover{color:var(--accent)}.widget .count{color:var(--muted);font-size:.8rem}.widget-cta{background:var(--accent);color:#fff;border:0}.widget-cta .widget-title,.widget-cta p,.widget-cta a{color:#fff}.widget-cta .widget-title{border-bottom-color:#ffffff40}.widget-cta p{margin:0 0 .75rem;font-size:.92rem}.widget-cta .header-cta{width:100%;color:var(--accent);background:#fff}.widget-cta .header-cta:hover{background:var(--accent-soft)}.related{margin-top:2.5rem;padding-top:.25rem}.related h2{margin-top:0}.library-header{max-width:760px}.library-search{gap:.65rem;margin:1.4rem 0 .7rem;display:flex}.library-search input{border:1px solid var(--line-strong);background:var(--white);min-width:0;min-height:50px;color:var(--ink);font:inherit;border-radius:10px;flex:1;padding:.72rem .95rem;transition:border-color .15s,box-shadow .15s;box-shadow:0 5px 16px #092f3b0d}.library-search input::placeholder{color:#8a999d}.library-search input:focus{border-color:var(--accent);outline:0;box-shadow:0 0 0 4px #0b596b21,0 5px 16px #092f3b0f}.library-search button{background:var(--accent);color:#fff;min-height:50px;font:inherit;cursor:pointer;border:0;border-radius:10px;padding:.7rem 1.15rem;font-weight:700;transition:background .15s,transform .15s,box-shadow .15s;box-shadow:0 5px 14px #092f3b24}.library-search button:hover{background:var(--accent-hover)}.search-help,.search-count{color:var(--muted);font-size:.88rem}.search-results{grid-template-columns:repeat(2,1fr);gap:1rem;margin-top:1.75rem;display:grid}.search-card{background:var(--bg-soft);color:inherit;border-radius:10px;padding:1.1rem;text-decoration:none;transition:box-shadow .15s,transform .15s}.search-card:hover{color:inherit;transform:translateY(-2px);box-shadow:0 10px 24px #092f3b14}.search-card h2{border:0;margin:.3rem 0 .4rem;padding:0;font-size:1.08rem}.search-card p{color:var(--ink-soft);margin:0;font-size:.9rem;line-height:1.45}.no-results{background:var(--bg-soft);color:var(--ink-soft);padding:1rem}.prose-page{max-width:800px}.prose-page h1{font-size:clamp(2rem,4vw,3rem)}.prose-page h2{margin-top:2.5rem}.trust-grid{grid-template-columns:repeat(3,1fr);gap:1rem;margin:1.6rem 0 2rem;display:grid}.trust-card{background:var(--bg-soft);border-radius:var(--radius);padding:1.1rem}.trust-card h3{margin:0 0 .35rem}.trust-card p{color:var(--ink-soft);margin:0;font-size:.94rem}.safety-list{padding-left:1.2rem}.safety-list li::marker{color:var(--danger)}.emergency-box{background:#fff7f3;border-radius:8px;margin:1.4rem 0 2rem;padding:1.1rem 1.2rem;box-shadow:0 8px 20px #c4522d0f}.emergency-box h2{color:#87351f;border:0;margin:0 0 .5rem;padding:0;font-size:1.2rem}.site-footer{background:var(--footer);color:var(--footer-text);font-size:.9rem}.site-footer a{color:#fff;text-decoration:none}.site-footer a:hover{text-decoration:underline}.footer-widgets{grid-template-columns:1.35fr 1fr 1fr 1fr;gap:2rem;padding:3rem 0 2.2rem;display:grid}.footer-brand{font-family:var(--display);margin-bottom:.7rem;font-size:1.1rem;font-weight:700;display:inline-block}.footer-widgets h2{color:#fff;letter-spacing:.12em;text-transform:uppercase;border-bottom:1px solid #31515a;margin:0 0 .75rem;padding:0 0 .45rem;font-size:.72rem}.footer-widgets ul{margin:0;padding:0;list-style:none}.footer-widgets li+li{margin-top:.35rem}.site-info{color:#9eb1b5;border-top:1px solid #31515a;padding:.85rem 0 1.1rem;font-size:.78rem}.site-info p{margin:0}.disclaimer{color:#9eb1b5;max-width:38rem;margin:0;font-size:.82rem}.empty-note{color:var(--muted);padding:1rem 0 2rem}.lead-paragraph{color:var(--ink-soft);font-size:1.12rem;line-height:1.6}.legal-page{max-width:840px}.legal-page h1{margin-bottom:.35rem}.legal-page h2{margin-top:2.4rem}.legal-page .legal-updated{color:var(--muted);margin-bottom:2rem;font-size:.84rem}.legal-page li+li{margin-top:.5rem}@media (width>=901px){.nav-drop summary{display:none}.nav-drop nav{display:flex!important}}@media (width<=900px){.home-hero-grid{grid-template-columns:1fr;gap:2rem;min-height:0;padding:4rem 0}.home-explainer,.home-library-overview{grid-template-columns:1fr;gap:2rem}.layout,.footer-widgets{grid-template-columns:1fr}.inside-header{flex-wrap:wrap}.nav-drop{order:3;width:100%;margin:0}.nav-drop nav{flex-direction:column;align-items:flex-start;gap:.65rem;padding:.75rem 0 .15rem}.header-cta{margin-left:auto}.home-layout{gap:2rem}.category-grid{grid-template-columns:repeat(3,1fr)}.category-card{min-height:190px}.category-card p{min-height:55px}}@media (width<=620px){.wrap{width:min(var(--content), calc(100% - 2rem))}.top-bar-inner{flex-direction:column;align-items:flex-start;gap:.1rem;padding:.55rem 0;font-size:.74rem}.brand-logo{width:220px}.header-cta{padding-inline:.65rem;font-size:.78rem}.hero-copy h1{font-size:2.45rem}.hero-lede{font-size:1.04rem}.section-heading{flex-direction:column;align-items:flex-start}.category-toolbar{flex-direction:column;align-items:flex-start;gap:.25rem}.symptom-grid,.category-grid,.featured-list,.search-results{grid-template-columns:1fr}.category-card,.category-card p{min-height:0}.callout-inner{flex-direction:column;align-items:flex-start}.library-search{flex-direction:column;align-items:stretch}.trust-grid,.faq-list{grid-template-columns:1fr}.site-content{padding-top:1rem}table{display:block;overflow-x:auto}}
