/* Heat Pump Running Costs – warm, editorial */
:root{
  --ink:#2b1f1a; --muted:#7a6a60; --bg:#fbf6ee; --card:#fffdf9; --line:#eadfd0;
  --terra:#c8502b; --terra-d:#a53f20; --teal:#0f5c5c; --sand:#f3e7d3; --good:#0f6b4f;
  --r:6px; --wrap:1040px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-font-smoothing:antialiased;scroll-behavior:smooth}
body{font-family:'DM Sans',system-ui,sans-serif;font-size:17.5px;line-height:1.7;color:var(--ink);background:var(--bg)}
h1,h2,h3{font-family:'DM Serif Display',Georgia,serif;font-weight:400;line-height:1.15}
h1{font-size:clamp(2.1rem,5.5vw,3.5rem)}
h2{font-size:clamp(1.5rem,3.2vw,2.1rem);margin:2.75rem 0 .9rem}
h3{font-size:1.25rem;margin-bottom:.4rem}
p{margin-bottom:1rem} a{color:var(--terra-d)}
ul,ol{padding-left:1.3rem;margin-bottom:1rem} li{margin-bottom:.35rem}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1.25rem}
.narrow{max-width:740px;margin:0 auto}

.top{border-bottom:2px solid var(--ink);background:var(--bg);position:sticky;top:0;z-index:20}
.top-in{display:flex;align-items:center;justify-content:space-between;min-height:66px;gap:1rem}
.brand{font-family:'DM Serif Display',serif;font-size:1.25rem;color:var(--ink);text-decoration:none;display:inline-flex;align-items:center;gap:.5rem}
.brand b{font-weight:400;color:var(--terra)}
.brand-mark{background:var(--terra);color:#fff;border-radius:50%;width:32px;height:32px;display:inline-grid;place-items:center;font-size:1rem;font-family:sans-serif}
.nav{display:flex;gap:1.1rem;flex-wrap:wrap}
.nav a{color:var(--ink);text-decoration:none;font-weight:500;font-size:.93rem;padding:.3rem 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.on{border-color:var(--terra)}
.menu-btn{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer;flex-direction:column;justify-content:center;gap:5px;align-items:center}
.menu-btn span{display:block;width:22px;height:2px;background:var(--ink)}

.hero{padding:3.5rem 0 2rem}
.hero p{font-size:1.2rem;max-width:640px;color:var(--muted)}
.hero h1{max-width:820px;margin-bottom:1rem}
.hero h1 em{font-style:italic;color:var(--terra)}
.tag{display:inline-block;border:1.5px solid var(--ink);font-weight:700;font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;padding:.25rem .7rem;border-radius:999px;margin-bottom:1.1rem}
.hero-sm{padding:3rem 0 1rem}
.pull-up{margin-top:0}

.card{background:var(--card);border:2px solid var(--ink);border-radius:var(--r);padding:1.6rem;box-shadow:6px 6px 0 var(--sand)}
.section{padding:2.5rem 0}
.grid{display:grid;gap:1rem}
.g2{grid-template-columns:repeat(2,1fr)} .g3{grid-template-columns:repeat(3,1fr)}

.btn{display:inline-block;font-weight:700;font-size:1rem;padding:.85rem 1.5rem;border-radius:var(--r);text-decoration:none;border:2px solid var(--ink);cursor:pointer;transition:transform .12s,box-shadow .12s;box-shadow:4px 4px 0 var(--ink)}
.btn:hover{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--ink)}
.btn-primary{background:var(--terra);color:#fff}
.btn-light{background:#ffd9a0;color:var(--ink)}
.btn-ghost{background:var(--card);color:var(--ink)}

.calc label{display:block;font-weight:700;font-size:.9rem;margin-bottom:.35rem}
.calc select,.calc input{width:100%;padding:.8rem .9rem;border:2px solid var(--ink);border-radius:var(--r);font:inherit;background:#fff;color:var(--ink)}
.calc select:focus,.calc input:focus{outline:3px solid rgba(200,80,43,.35)}
.calc-fields{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:1rem;margin-bottom:1rem}
.calc-fields.two{grid-template-columns:1fr 1fr}
.hint{font-size:.82rem;color:var(--muted);margin-top:.35rem}
.bars{margin:1.5rem 0 1rem}
.bar-row{display:grid;grid-template-columns:210px 1fr 90px;gap:.75rem;align-items:center;margin-bottom:.7rem}
.bar-row .lbl{font-weight:500;font-size:.95rem;line-height:1.3}
.bar-track{background:var(--sand);border-radius:3px;height:30px;overflow:hidden}
.bar{height:100%;background:var(--muted);border-radius:3px;transition:width .3s}
.bar.gas{background:#8a7a6e} .bar.hp{background:var(--terra)} .bar.cosy{background:var(--teal)}
.bar-row .val{font-family:'DM Serif Display',serif;font-size:1.35rem;text-align:right}
.verdict{background:var(--teal);color:#fff;border-radius:var(--r);padding:1.1rem 1.3rem;display:flex;flex-wrap:wrap;gap:1rem;align-items:center;justify-content:space-between}
.verdict.neg{background:#6b5d53}
.verdict strong{font-family:'DM Serif Display',serif;font-size:1.4rem;font-weight:400;color:#ffd9a0}
.verdict p{margin:0;max-width:560px}

.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:2px solid var(--ink);border-radius:var(--r);background:var(--card);margin:1.5rem 0}
.stat{padding:1.2rem 1.3rem;border-right:2px solid var(--ink)}
.stat:last-child{border-right:0}
.stat small{display:block;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}
.stat .big{font-family:'DM Serif Display',serif;font-size:2rem;line-height:1.2;display:block}
.stat .sub{font-size:.85rem;color:var(--muted)}

.tbl-wrap{overflow-x:auto;border:2px solid var(--ink);border-radius:var(--r);background:var(--card);margin:1rem 0 1.5rem}
table{width:100%;border-collapse:collapse;font-size:.95rem;min-width:500px}
th,td{padding:.75rem 1rem;text-align:left;border-bottom:1px solid var(--line)}
th{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;background:var(--sand)}
tr:last-child td{border-bottom:0}
td.n{font-variant-numeric:tabular-nums;white-space:nowrap;font-weight:700}
tr.best td{background:#e6f2ee}
.good{color:var(--good)} .bad{color:var(--terra-d)}

.home-list{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
.home-link{display:block;background:var(--card);border:2px solid var(--ink);border-radius:var(--r);padding:1.1rem 1.2rem;text-decoration:none;color:var(--ink);box-shadow:4px 4px 0 var(--sand)}
.home-link:hover{box-shadow:4px 4px 0 var(--terra)}
.home-link b{font-family:'DM Serif Display',serif;font-weight:400;font-size:1.2rem;display:block}
.home-link span{font-size:.88rem;color:var(--muted)}

.note{background:var(--sand);border-left:4px solid var(--terra);border-radius:var(--r);padding:1rem 1.2rem;margin:1.25rem 0;font-size:.96rem}
.note p:last-child{margin:0}
.src{font-size:.83rem;color:var(--muted)} .src a{color:var(--muted)}
.faq{border-bottom:1px solid var(--ink)}
.faq:first-of-type{border-top:1px solid var(--ink)}
.faq summary{cursor:pointer;font-weight:700;padding:1rem 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';float:right;color:var(--terra);font-size:1.2rem}
.faq[open] summary::after{content:'–'}
.faq div{padding:0 0 .75rem}

.cta-band{background:var(--teal);color:#fff;text-align:center;padding:3.5rem 0;margin-top:3rem}
.cta-band h2{margin-top:0} .cta-band p{max-width:620px;margin:0 auto 1.5rem;opacity:.92}
.fine{font-size:.8rem;opacity:.7;margin-top:1.2rem!important}
.foot{border-top:2px solid var(--ink);padding:2.5rem 0 2rem;font-size:.9rem;color:var(--muted)}
.foot-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:2rem;margin-bottom:1.5rem}
.foot nav{display:grid;grid-template-columns:1fr 1fr;gap:.3rem 1rem}
.foot nav a{color:var(--ink);text-decoration:none} .foot nav a:hover{color:var(--terra)}
.foot-note{border-top:1px solid var(--line);padding-top:1.25rem;font-size:.82rem}

@media(max-width:900px){
  .menu-btn{display:flex}
  .nav{display:none;position:absolute;left:0;right:0;top:66px;background:var(--bg);border-bottom:2px solid var(--ink);padding:.75rem 1.25rem;flex-direction:column;gap:.4rem}
  .nav.open{display:flex}
  .calc-fields,.calc-fields.two{grid-template-columns:1fr}
  .home-list,.g3{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr}
  .bar-row{grid-template-columns:1fr 80px}
  .bar-row .lbl{grid-column:1/-1;margin-bottom:-.4rem}
}
@media(max-width:560px){
  body{font-size:16.5px}
  .g2,.g3,.home-list,.stats{grid-template-columns:1fr}
  .stat{border-right:0;border-bottom:2px solid var(--ink)} .stat:last-child{border-bottom:0}
  .card{padding:1.1rem;box-shadow:4px 4px 0 var(--sand)}
  .brand{font-size:1.05rem}
}