/* Elk River Water Heater Pros: "hot over cold" system
   navy #13223F · flame #FF6B1A (calls only) · ember #FFE6D5 · cold #2E6BD8 · frost #EAF1FB · white · ink #1A2233 */
:root{--navy:#13223F;--navy-2:#1E3260;--flame:#FF6B1A;--flame-ink:#2B1100;--ember:#FFE6D5;--cold:#2E6BD8;--frost:#EAF1FB;--ink:#1A2233;--ink-2:#4A5568;--line:#D9E1EC;
--display:"Bricolage Grotesque","Trebuchet MS",sans-serif;--body:"Public Sans","Segoe UI",system-ui,sans-serif;--wrap:1180px;--r:28px;--r-sm:14px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{margin:0;background:#fff;color:var(--ink);font:400 1.0625rem/1.68 var(--body)}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--cold);text-underline-offset:3px}
:focus-visible{outline:3px solid var(--flame);outline-offset:2px;border-radius:6px}
.skip{position:absolute;left:-999px;top:0;background:var(--flame);color:var(--flame-ink);padding:.6rem 1rem;z-index:99}.skip:focus{left:1rem}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}.narrow{max-width:740px}
h1,h2,h3{font-family:var(--display);font-weight:800;line-height:1.02;letter-spacing:-.02em;color:var(--navy);margin:0 0 .45em}
h1{font-size:clamp(2.5rem,5.4vw,4.3rem)}h2{font-size:clamp(1.9rem,3.4vw,2.8rem)}h3{font-size:1.35rem;font-weight:600;letter-spacing:-.01em}
p{margin:0 0 1em}.lead{font-size:1.2rem;color:var(--ink-2);max-width:34em}

.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}
.nav-row{display:flex;align-items:center;gap:26px;min-height:74px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy)}
.logo svg{width:34px;height:40px;flex:none}
.logo-text{font:800 1.3rem/1 var(--display);letter-spacing:-.02em}
.logo-text small{display:block;font:600 .78rem/1.3 var(--body);color:var(--ink-2);letter-spacing:0}
.nav{display:flex;gap:22px;margin-left:auto}.nav a{color:var(--ink);text-decoration:none;font-weight:600}.nav a:hover,.nav a[aria-current]{color:var(--cold)}
.menu-toggle{display:none;margin-left:auto;background:var(--frost);border:0;border-radius:12px;width:46px;height:46px;font-size:1.3rem;color:var(--navy)}
.mobile-menu{padding:8px 20px 16px;border-top:1px solid var(--line)}.mobile-menu a{display:block;padding:12px 0;color:var(--ink);font-weight:600;text-decoration:none}

.btn{display:inline-flex;align-items:center;gap:.55em;font:700 1.05rem/1 var(--body);text-decoration:none;border-radius:14px;padding:1em 1.35em;border:2px solid transparent;cursor:pointer}
.btn-call{background:var(--flame);color:var(--flame-ink)}.btn-call:hover{background:#FF8640}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}.btn-ghost:hover{border-color:#fff}
.js-call svg{width:1.05em;height:1.05em;flex:none}
.inline-call{display:inline-flex;align-items:center;gap:.35em;font-weight:700;color:var(--flame)}

/* hero: dark, with the tank */
.hero{background:var(--navy);color:#DCE5F3;padding:64px 0 0;overflow:hidden}
.hero h1{color:#fff}.hero .lead{color:#B9C7DD}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:end}
.hero-copy{padding-bottom:64px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:1.6em 0 1.4em}
.facts{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.facts li{background:rgba(255,255,255,.08);border-radius:999px;padding:.35em .9em;font-size:.95rem;color:#DCE5F3}
.tank-wrap{position:relative;align-self:end}
.tank-wrap svg{width:100%;max-width:400px;margin:0 auto}

/* symptom tabs */
.section{padding:84px 0}.section-frost{background:var(--frost)}.section-ember{background:var(--ember)}
.section-head{max-width:700px;margin-bottom:34px}
.tabs{display:grid;grid-template-columns:260px 1fr;gap:28px;align-items:start}
.tablist{display:flex;flex-direction:column;gap:6px}
.tablist button{text-align:left;font:600 1.05rem var(--body);background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:14px 16px;color:var(--ink);cursor:pointer}
.tablist button[aria-selected=true]{background:var(--navy);color:#fff;border-color:var(--navy)}
.tabpanel{background:#fff;border-radius:var(--r);padding:32px 34px;border:1px solid var(--line)}
.tabpanel h3{font-size:1.7rem;font-weight:800}
.tabpanel .verdict{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:18px}
.tabpanel .verdict div{border-radius:var(--r-sm);padding:16px 18px}
.v-diy{background:var(--frost)}.v-call{background:var(--ember)}
.tabpanel .verdict h4{margin:0 0 .3em;font:700 1rem var(--body)}
.tabpanel .verdict p{margin:0;font-size:.98rem}

/* safety strip */
.danger{display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;background:var(--navy);color:#DCE5F3;border-radius:var(--r);padding:28px 32px}
.danger h2{color:#fff;font-size:1.7rem;margin:0 0 .2em}.danger p{margin:0}
.danger .ico{width:56px;height:56px;border-radius:50%;background:var(--flame);display:grid;place-items:center;color:var(--flame-ink);font:800 1.8rem var(--display)}

/* checker */
.checker{display:grid;grid-template-columns:1.1fr .9fr;gap:28px;align-items:start}
.checker fieldset{border:0;margin:0 0 18px;padding:0}
.checker legend{font:700 1.15rem var(--body);margin-bottom:10px;color:var(--navy)}
.opts{display:flex;flex-wrap:wrap;gap:8px}
.opts label{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 14px;cursor:pointer;font-weight:600}
.opts input{accent-color:var(--flame);width:18px;height:18px}
.meter{background:#fff;border-radius:var(--r);padding:28px;border:1px solid var(--line);position:sticky;top:96px}
.meter-bar{height:16px;border-radius:999px;background:linear-gradient(90deg,var(--cold),#9AA9C6 50%,var(--flame));position:relative;margin:16px 0 8px}
.meter-dot{position:absolute;top:50%;width:26px;height:26px;border-radius:50%;background:#fff;border:4px solid var(--navy);transform:translate(-50%,-50%);left:20%;transition:left .3s}
.meter-scale{display:flex;justify-content:space-between;font-size:.9rem;color:var(--ink-2)}
.meter h3{margin-top:14px}

/* how-it-works rows */
.rows{display:grid;gap:0}
.row{display:grid;grid-template-columns:220px 1fr;gap:28px;padding:26px 0;border-top:1px solid var(--line)}
.row h3{margin:0}
.row p{margin:0}

.areas{display:flex;flex-wrap:wrap;gap:10px}
.areas span{background:#fff;border:1px solid var(--line);border-radius:999px;padding:.5em 1em;font-weight:600}

.faq details{background:#fff;border-radius:var(--r-sm);margin-bottom:10px;border:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:18px 54px 18px 20px;font-weight:700;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:22px;top:24px;width:12px;height:12px;border-right:3px solid var(--cold);border-bottom:3px solid var(--cold);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(225deg);top:28px}
.faq details>div{padding:0 20px 16px;color:var(--ink-2)}

.final{background:linear-gradient(120deg,var(--navy) 55%,#3A2A52 80%,var(--flame) 140%);border-radius:var(--r);padding:44px;display:flex;flex-wrap:wrap;gap:20px;align-items:center;justify-content:space-between}
.final h2{color:#fff;margin:0;max-width:15em}

.crumbs{font-size:.92rem;color:var(--ink-2);padding:20px 0 0}.crumbs a{color:var(--ink-2)}
.article-head{padding:18px 0 26px;margin-bottom:28px;border-bottom:1px solid var(--line)}.article-head .meta{color:var(--ink-2);font-size:.95rem}
.article{font-size:1.1rem}.article h2{font-size:2rem;margin-top:1.5em}.article h3{margin-top:1.3em}.article li{margin-bottom:.45em}
.answer{background:var(--frost);border-radius:var(--r-sm);padding:20px 24px;margin:0 0 1.6em;font-size:1.12rem;border-left:6px solid var(--cold)}
.inline-cta{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;background:var(--ember);border-radius:var(--r-sm);padding:22px 24px;margin:2em 0}
.inline-cta p{margin:0;max-width:30em}
.post-list a{display:block;padding:24px;margin-bottom:12px;border-radius:var(--r-sm);background:var(--frost);text-decoration:none;color:var(--ink)}
.post-list h2{font-size:1.55rem;margin:0 0 .2em}.post-list p{margin:0;color:var(--ink-2)}
.src{font-size:.88rem;color:var(--ink-2)}

.site-footer{background:#0D1830;color:#AAB8D0;padding:56px 0 96px;font-size:.97rem;margin-top:84px}
.site-footer a{color:#E3EAF6}.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.site-footer h2{font-size:1.15rem;color:#fff;margin-bottom:.6em;letter-spacing:0}.site-footer ul{list-style:none;padding:0;margin:0}.site-footer li{margin-bottom:.4em}
.disclaimer{margin-top:36px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);color:#62728F;font-size:.85rem}
.callbar{display:none}
@media (max-width:920px){.nav,.nav-call{display:none}.menu-toggle{display:block}
 .hero-grid,.checker,.tabs{grid-template-columns:1fr}.hero-copy{padding-bottom:0}.tank-wrap svg{max-width:280px}
 .tablist{flex-direction:row;overflow-x:auto;padding-bottom:4px}.tablist button{white-space:nowrap}
 .row{grid-template-columns:1fr;gap:6px}.danger{grid-template-columns:1fr}.foot-grid{grid-template-columns:1fr}.meter{position:static}
 .callbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:50;padding:10px 14px calc(10px + env(safe-area-inset-bottom));background:rgba(255,255,255,.97);border-top:1px solid var(--line)}.callbar .btn{width:100%;justify-content:center}}
@media (max-width:560px){.section{padding:60px 0}.tabpanel{padding:24px}.tabpanel .verdict{grid-template-columns:1fr}.logo-text small{display:none}.final{padding:30px}}
@media (max-width:560px){.tank-wrap svg{max-width:210px}}