/* HVACpayback.com — shared site shell, v2 "warm linen" refresh.
   Identity kept: EnergyGuide-label vernacular, Barlow Condensed display,
   ink navy + guide yellow. Refreshed: warm paper, Source Serif 4 reading
   face, soft layered depth, larger radii, generous spacing. */
:root{
  color-scheme:light;
  --ink:#1b2833;
  --ink-soft:#44525d;
  --ink-faint:#6e7d89;
  --paper:#edf1f5;
  --paper-deep:#e2e8ee;
  --card:#ffffff;
  --line:#d8e0e8;
  --line-strong:#b9c6d2;
  --cool:#2277b5;
  --steel:#5d7386;
  --steel-tint:#e8edf2;
  --cool-deep:#175e92;
  --cool-tint:#e7f1f9;
  --heat:#e2633c;
  --heat-deep:#b84a28;
  --heat-tint:#fdf0ea;
  --guide-yellow:#ffd42e;
  --guide-yellow-deep:#f2c400;
  --ok:#1e8a5a;
  --warn:#b3261e;
  --radius:14px;
  --radius-sm:9px;
  --shadow-sm:0 1px 2px rgba(29,43,54,.05),0 4px 14px rgba(29,43,54,.05);
  --shadow-md:0 2px 6px rgba(29,43,54,.07),0 16px 36px rgba(29,43,54,.10);
  --disp:"Barlow Condensed","Arial Narrow",Arial,sans-serif;
  --body:"Barlow",Arial,sans-serif;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--paper)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{font-family:var(--body);background:var(--paper);color:var(--ink);font-size:17px;line-height:1.6;overflow-x:clip}

/* ---------- generic page scaffolding ---------- */
.page{max-width:1080px;margin:0 auto;padding:0 20px}
.page-narrow{max-width:840px;margin:0 auto;padding:0 20px}
.eyebrow{font-family:var(--disp);font-weight:600;font-size:14.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--cool-deep)}
.eyebrow.heat{color:var(--heat-deep)}
h1.page-title{font-family:var(--disp);font-weight:700;font-size:clamp(36px,5.5vw,54px);line-height:1.02;letter-spacing:.004em;margin:8px 0 14px}
.lede{font-family:var(--serif);font-size:20px;color:var(--ink-soft);line-height:1.65;max-width:64ch}
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.btn{display:inline-block;font-family:var(--disp);font-weight:600;font-size:16.5px;letter-spacing:.07em;text-transform:uppercase;border:none;border-radius:10px;padding:13px 22px 12px;cursor:pointer;background:var(--cool);color:#fff;text-decoration:none;box-shadow:0 2px 0 var(--cool-deep),0 6px 16px rgba(31,127,187,.28);transition:transform .14s,box-shadow .14s,background .14s}
.btn:hover{background:var(--cool-deep);transform:translateY(-1px);box-shadow:0 3px 0 #0a4a70,0 9px 20px rgba(31,127,187,.32)}
.btn.heat{background:var(--heat);box-shadow:0 2px 0 var(--heat-deep),0 6px 16px rgba(226,99,60,.28)}
.btn.heat:hover{background:var(--heat-deep);box-shadow:0 3px 0 #8f3419,0 9px 20px rgba(226,99,60,.32)}
.btn.ghost{background:transparent;border:1.5px solid var(--line-strong);color:var(--ink-soft);box-shadow:none}
.btn.ghost:hover{border-color:var(--ink-soft);color:var(--ink);background:var(--card);transform:none;box-shadow:var(--shadow-sm)}

/* ---------- article / learn pages ---------- */
.article{padding-top:44px;padding-bottom:20px}
.article-body{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px clamp(20px,4.5vw,48px) 36px;margin-top:26px;box-shadow:var(--shadow-sm)}
.article-body h2{font-family:var(--disp);font-weight:700;font-size:28px;letter-spacing:.03em;text-transform:uppercase;margin:34px 0 10px;padding-top:22px;border-top:2px solid var(--ink)}
.article-body h2:first-child{margin-top:0;border-top:none;padding-top:0}
.article-body h3{font-family:var(--disp);font-weight:700;font-size:20px;letter-spacing:.04em;text-transform:uppercase;margin:22px 0 6px;color:var(--ink)}
.article-body p{font-family:var(--serif);font-size:17.5px;line-height:1.72;margin:0 0 14px;color:#3a4550;max-width:70ch}
.article-body p b,.article-body p strong{color:var(--ink)}
.article-body a{color:var(--cool-deep);font-weight:600;text-decoration-thickness:1.5px;text-underline-offset:3px}
.article-body a:hover{color:var(--cool)}
.article-body code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.82em;background:var(--paper);padding:2px 7px;border-radius:5px;border:1px solid var(--line)}
.article-body table{border-collapse:separate;border-spacing:0;width:100%;margin:12px 0 18px;font-size:15.5px;border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden}
.article-body th{font-family:var(--disp);font-weight:700;font-size:14.5px;letter-spacing:.07em;text-transform:uppercase;text-align:left;background:var(--ink);color:#fff;padding:10px 13px}
.article-body td{border-top:1px solid var(--line);padding:10px 13px;color:var(--ink-soft)}
.article-body td b{color:var(--ink)}
.article-body tr:nth-child(even) td{background:#f6f9fb}
.callout{border:1px solid var(--line);border-left:8px solid var(--cool);border-radius:10px;background:#f3f7fb;padding:15px 18px;margin:16px 0 18px;font-size:15.5px;color:var(--ink-soft);max-width:72ch;box-shadow:var(--shadow-sm)}
.callout b{color:var(--ink)}
.callout.cool{background:var(--cool-tint);border-left-color:var(--cool)}
.rule-of-thumb{background:var(--guide-yellow);border:3px solid var(--ink);border-radius:11px;margin:18px 0;overflow:hidden;max-width:72ch;box-shadow:5px 5px 0 rgba(27,40,51,.12)}
.rule-of-thumb .rt-bar{background:var(--ink);color:var(--guide-yellow);font-family:var(--disp);font-weight:700;font-size:14px;letter-spacing:.22em;text-transform:uppercase;padding:7px 15px 6px}
.rule-of-thumb .rt-body{padding:13px 17px 14px;font-size:17px;font-weight:600;color:#3c3303}
.faq-block{margin-top:10px}
.faq-block details{border:1px solid var(--line);border-radius:var(--radius-sm);background:#f5f8fb;margin-bottom:10px;transition:box-shadow .15s}
.faq-block details[open]{background:var(--card);box-shadow:var(--shadow-sm)}
.faq-block summary{list-style:none;cursor:pointer;padding:14px 18px;font-weight:700;font-size:16px;color:var(--ink);display:flex;justify-content:space-between;align-items:center;gap:10px;min-height:50px}
.faq-block summary::-webkit-details-marker{display:none}
.faq-block summary::after{content:"+";font-family:var(--disp);font-size:24px;color:var(--ink-faint);flex:0 0 auto}
.faq-block details[open] summary::after{content:"–"}
.faq-block .faq-a{padding:0 18px 15px}
.faq-block .faq-a p{font-family:var(--serif);font-size:16px;line-height:1.68;color:var(--ink-soft);max-width:70ch;margin:0}
.next-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(235px,1fr));gap:14px;margin:30px 0 10px}
.next-links a{display:block;background:var(--card);border:1px solid var(--line);border-top:5px solid var(--cool);border-radius:var(--radius);padding:16px 17px;text-decoration:none;color:var(--ink);box-shadow:var(--shadow-sm);transition:box-shadow .16s,transform .16s}
.next-links a:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.next-links a.heat{border-top-color:var(--heat)}
.next-links a.gold{border-top-color:var(--steel)}
.next-links .nl-kicker{font-family:var(--disp);font-weight:600;font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-faint)}
.next-links .nl-title{display:block;font-family:var(--disp);font-weight:700;font-size:20px;letter-spacing:.02em;line-height:1.14;margin-top:3px}
.next-links .nl-sub{display:block;font-size:14px;color:var(--ink-soft);margin-top:5px;line-height:1.5}

/* ---------- site footer ---------- */
.site-footer{background:linear-gradient(180deg,var(--ink),#15212b);color:#cfdde8;margin-top:52px;border-top:6px solid var(--cool)}
.footer-inner{max-width:1080px;margin:0 auto;padding:36px 20px 26px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
@media (max-width:820px){.footer-inner{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.footer-inner{grid-template-columns:1fr}}
.footer-inner h4{font-family:var(--disp);font-weight:700;font-size:15.5px;letter-spacing:.15em;text-transform:uppercase;color:#93c5e8;margin-bottom:11px}
.footer-inner ul{list-style:none}
.footer-inner li{margin-bottom:8px}
.footer-inner a{color:#c5d5e1;text-decoration:none;font-size:14.5px;transition:color .12s}
.footer-inner a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.footer-about{font-size:14.5px;line-height:1.65;color:#9db2c0;max-width:40ch}
.footer-legal{border-top:1px solid #2e4152;margin-top:6px}
.footer-legal .fl-inner{max-width:1080px;margin:0 auto;padding:15px 20px 20px;font-size:12.5px;color:#8499a8;line-height:1.65}
a:focus-visible,button:focus-visible{outline:3px solid rgba(31,127,187,.55);outline-offset:2px}

/* ---------- incentive stack cards (rebates page) ---------- */
.stack-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(205px,1fr));gap:14px;margin:16px 0 10px}
.stack-card{background:var(--card);border:1px solid var(--line);border-top:5px solid var(--cool);border-radius:var(--radius);padding:16px 17px 15px;box-shadow:var(--shadow-sm)}
.stack-card.gold{border-top-color:var(--steel)}
.stack-card.heat{border-top-color:var(--heat)}
.stack-card.ok{border-top-color:var(--ok)}
.stack-card .sc-kicker{font-family:var(--disp);font-weight:600;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-faint)}
.stack-card .sc-amt{font-family:var(--disp);font-weight:700;font-size:31px;line-height:1.02;margin:4px 0 3px;color:var(--ink)}
.stack-card .sc-who{display:inline-block;font-family:var(--disp);font-weight:600;font-size:12px;letter-spacing:.08em;text-transform:uppercase;background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:3px 9px 2px;color:var(--ink-soft);margin:2px 0 8px}
.article-body .stack-card p{font-family:var(--body);font-size:14px;line-height:1.55;color:var(--ink-soft);margin:0}
.mini-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:14px 0 8px}
@media (max-width:640px){.mini-steps{grid-template-columns:1fr}}
.mini-steps > div{background:#f5f8fb;border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 15px}
.mini-steps .ms-num{font-family:var(--disp);font-weight:700;font-size:15px;color:#fff;background:var(--cool);border-radius:999px;width:27px;height:27px;display:inline-flex;align-items:center;justify-content:center;margin-bottom:8px;box-shadow:0 2px 0 var(--cool-deep)}
.mini-steps h3{font-family:var(--disp);font-weight:700;font-size:17.5px;letter-spacing:.03em;text-transform:uppercase;margin:0 0 4px}
.article-body .mini-steps p{font-family:var(--body);font-size:13.5px;line-height:1.55;color:var(--ink-soft);margin:0;max-width:none}

/* ---------- benefit tiles (comfort page + homepage band) ---------- */
.benefit-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(205px,1fr));gap:14px;margin:16px 0 8px}
.benefit-tile{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:17px 17px 16px;box-shadow:var(--shadow-sm)}
.benefit-tile .bt-icon{width:42px;height:42px;border-radius:12px;background:var(--cool-tint);display:flex;align-items:center;justify-content:center;margin-bottom:10px}
.benefit-tile.warm .bt-icon{background:var(--heat-tint)}
.benefit-tile.gold .bt-icon{background:var(--steel-tint)}
.benefit-tile h3{font-family:var(--disp);font-weight:700;font-size:19.5px;letter-spacing:.03em;text-transform:uppercase;margin:0 0 4px;line-height:1.12}
.benefit-tile p,.article-body .benefit-tile p{font-family:var(--body);font-size:14px;line-height:1.58;color:var(--ink-soft);margin:0;max-width:none}

/* ---------- repair-or-replace components ---------- */
.benefit-tile[id],.article-body h2[id]{scroll-margin-top:84px}
.cost-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:16px 0 12px}
@media (max-width:760px){.cost-cards{grid-template-columns:1fr}}
.cost-card{background:#f5f8fb;border:1px solid var(--line);border-radius:var(--radius);padding:17px 17px 16px}
.cost-card .cn{font-family:var(--disp);font-weight:700;font-size:15px;color:#fff;background:var(--cool);border-radius:999px;width:27px;height:27px;display:inline-flex;align-items:center;justify-content:center;margin-bottom:9px;box-shadow:0 2px 0 var(--cool-deep)}
.cost-card h3{font-family:var(--disp);font-weight:700;font-size:19px;letter-spacing:.03em;text-transform:uppercase;margin:0 0 6px;line-height:1.12}
.article-body .cost-card p{font-family:var(--body);font-size:14.5px;line-height:1.62;color:var(--ink-soft);margin:0;max-width:none}
.cost-card .cc-big{font-family:var(--disp);font-weight:700;font-size:15px;letter-spacing:.05em;text-transform:uppercase;color:var(--cool-deep);display:block;margin-top:9px}
.verdict{display:grid;gap:11px;margin:16px 0 12px}
.verdict > div{display:grid;grid-template-columns:170px 1fr;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--card);box-shadow:var(--shadow-sm)}
@media (max-width:560px){.verdict > div{grid-template-columns:1fr}}
.verdict .v-band{display:flex;flex-direction:column;justify-content:center;padding:12px 15px;color:#fff}
.verdict .v-band .yrs{font-family:var(--disp);font-weight:700;font-size:22px;line-height:1.05}
.verdict .v-band .lbl{font-family:var(--disp);font-weight:600;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;opacity:.9;margin-top:1px}
.verdict .v-band.go{background:linear-gradient(135deg,#1c7c52,#25995f)}
.verdict .v-band.lean{background:linear-gradient(135deg,var(--cool-deep),var(--cool))}
.verdict .v-band.weigh{background:linear-gradient(135deg,#556b7d,#67808f)}
.verdict .v-band.hold{background:linear-gradient(135deg,#333f49,#465562)}
.article-body .verdict .v-say{font-family:var(--body);font-size:14.5px;line-height:1.6;color:var(--ink-soft);margin:0;padding:12px 16px;align-self:center;max-width:none}
.article-body .verdict .v-say b{color:var(--ink)}
.check-list{display:grid;grid-template-columns:1fr 1fr;gap:11px 14px;margin:14px 0 12px}
@media (max-width:640px){.check-list{grid-template-columns:1fr}}
.check-list > div{display:flex;gap:11px;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:11px;padding:12px 14px;box-shadow:var(--shadow-sm)}
.check-list svg{flex:0 0 19px;margin-top:1px}
.article-body .check-list p{font-family:var(--body);font-size:14.5px;line-height:1.58;color:var(--ink-soft);margin:0;max-width:none}
.article-body .check-list p b{display:block;color:var(--ink);font-family:var(--disp);font-weight:700;font-size:16.5px;letter-spacing:.03em;text-transform:uppercase;margin-bottom:2px}

/* ---------- mobile content polish ---------- */
@media (max-width:740px){
  /* content polish */
  .article{padding-top:28px}
  h1.page-title{font-size:clamp(31px,8.5vw,38px)}
  .lede{font-size:17.5px}
  .article-body{padding:24px 18px 26px}
  .article-body h2{font-size:23px}
  .article-body p{font-size:16.5px}
  .verdict > div{grid-template-columns:1fr}
  .verdict .v-band{flex-direction:row;align-items:baseline;gap:10px;padding:10px 15px 9px}
  .verdict .v-band .lbl{margin-top:0}
  .footer-inner{padding-top:28px;gap:22px}
  .btn{width:100%;text-align:center}
  .next-links a .nl-title{font-size:19px}
}

/* ---------- responsive tables ---------- */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:12px 0 18px;border-radius:var(--radius-sm)}
.table-scroll .article-body-table,.table-scroll table{margin:0;min-width:520px}

/* ---------- scroll reveals (active only when reveal.js adds html.rvl) ---------- */
html.rvl .rv{opacity:0;transform:translateY(16px)}
html.rvl .rv.in{opacity:1;transform:none;transition:opacity .55s ease,transform .6s cubic-bezier(.22,.7,.3,1);transition-delay:var(--rd,0ms)}
/* heading underline sweep: homepage section heads */
html.rvl .sec-head h2{border-bottom-color:transparent;background:linear-gradient(var(--cool),var(--cool)) 0 100%/0 4px no-repeat;transition:background-size .65s cubic-bezier(.22,.7,.3,1) .05s}
html.rvl .sec-head.in h2{background-size:100% 4px}
/* article h2 top-rule sweep (first h2 has no rule; keep it that way) */
html.rvl .article-body h2:not(:first-child){border-top-color:transparent;background:linear-gradient(var(--ink),var(--ink)) 0 0/0 2px no-repeat;transition:background-size .65s cubic-bezier(.22,.7,.3,1)}
html.rvl .article-body h2.in:not(:first-child){background-size:100% 2px}
@media (prefers-reduced-motion:reduce){
  html.rvl .rv{opacity:1;transform:none;transition:none}
  html.rvl .sec-head h2{border-bottom-color:var(--cool);background:none}
  html.rvl .article-body h2:not(:first-child){border-top-color:var(--ink);background:none}
}


/* ---------- GEO answer box + freshness line ---------- */
.page-meta{font-size:13.5px;color:var(--ink-faint);margin:10px 0 0;font-family:var(--body)}
.page-meta a{color:var(--cool-deep);font-weight:600}
.at-a-glance{border:2px solid var(--ink);border-radius:12px;overflow:hidden;margin:0 0 22px;background:var(--card);box-shadow:var(--shadow-sm)}
.at-a-glance .ag-bar{background:var(--ink);color:var(--guide-yellow);font-family:var(--disp);font-weight:700;font-size:13.5px;letter-spacing:.2em;text-transform:uppercase;padding:7px 15px 6px}
.at-a-glance ul{list-style:none;margin:0;padding:12px 17px 13px;display:grid;gap:8px}
.at-a-glance li{position:relative;padding-left:21px;font-family:var(--body);font-size:15px;line-height:1.55;color:var(--ink-soft);max-width:72ch}
.at-a-glance li::before{content:"";position:absolute;left:2px;top:.42em;width:9px;height:9px;background:var(--guide-yellow);border:1.5px solid var(--ink);border-radius:2.5px}
.at-a-glance li b,.at-a-glance li code{color:var(--ink)}
.at-a-glance li code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.86em;background:var(--paper);padding:1px 5px;border-radius:4px;border:1px solid var(--line)}

/* ---------- polish layer: typography, micro-interactions ---------- */
::selection{background:var(--guide-yellow);color:var(--ink)}
h1,h2,h3,.nl-title,.page-title{text-wrap:balance}
.lede{text-wrap:pretty}
.article-body p{text-wrap:pretty}

/* prose links: living underline */
.article-body a{text-decoration-thickness:.07em;text-underline-offset:.2em;transition:color .15s,text-decoration-thickness .15s,text-underline-offset .15s}
.article-body a:hover{text-decoration-thickness:.16em;text-underline-offset:.13em}

/* press states (buttons already lift on hover) */
.btn:active{transform:translateY(1px);box-shadow:0 1px 0 rgba(0,0,0,.25)}
.next-links a{transition:box-shadow .18s ease,transform .18s ease}
.next-links a:active{transform:translateY(0)}

/* FAQ: rotating marker + gentle answer entrance */
.faq-block summary::after{transition:transform .22s ease,color .15s ease}
.faq-block summary:hover::after{color:var(--cool-deep)}
.faq-block details[open] summary::after{content:"+";transform:rotate(45deg)}
@keyframes faqIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.faq-block details[open] .faq-a{animation:faqIn .24s ease}

/* wide-table affordances */
.table-scroll{scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent}
.table-scroll::-webkit-scrollbar{height:8px}
.table-scroll::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:99px}
.table-scroll::-webkit-scrollbar-track{background:transparent}
@media (max-width:600px){.table-scroll{box-shadow:inset -16px 0 14px -14px rgba(27,40,51,.22)}}