/* ==========================================================================
   heatpumpestimate.co.uk — shared stylesheet
   Design tokens. Edit colours/fonts here once.
   ========================================================================== */

:root {
  /* Palette — petrol teal (trust) + warm amber (single CTA) + off-white ground */
  --petrol:      #0E3A3A;  /* deep teal trust anchor */
  --petrol-700:  #12504C;  /* lighter petrol for hovers/links */
  --amber:       #E8954A;  /* the one CTA accent */
  --amber-700:   #D27E33;  /* amber hover */
  --ground:      #FAF8F5;  /* near-white page ground */
  --mist:        #EDF2F1;  /* soft card / panel fill */
  --slate:       #283332;  /* body text */
  --slate-500:   #5C6B69;  /* muted text */
  --line:        #D9E0DE;  /* hairline borders */
  --white:       #FFFFFF;
  --success:     #2E7D5B;  /* confirmation green */
  --success-bg:  #E6F2EC;
  --error:       #B23A2E;
  --error-bg:    #FBEAE7;

  /* Type scale (1.250 major-third-ish) */
  --fs-eyebrow: 0.8125rem;
  --fs-body:    1.0625rem;
  --fs-lead:    1.25rem;
  --fs-h3:      1.4rem;
  --fs-h2:      2rem;
  --fs-h1:      2.85rem;
  --fs-mega:    3.6rem;   /* result-card cost figure */

  --maxw: 1080px;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(14,58,58,.06), 0 8px 24px rgba(14,58,58,.07);
  --shadow-lg: 0 2px 6px rgba(14,58,58,.08), 0 20px 50px rgba(14,58,58,.12);
}

/* ---------- Fonts ---------- */
@font-face {
  font-family: 'Fraunces';
  src: local('Fraunces');
  font-display: swap;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--slate);
  background: var(--ground);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: 'Fraunces', Georgia, 'Times New Roman', serif;
  font-weight: 600;
  line-height: 1.1;
  color: var(--petrol);
  letter-spacing: -0.01em;
  margin: 0 0 .5em;
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); margin-top: 0; }
h3 { font-size: var(--fs-h3); font-weight: 600; }

p { margin: 0 0 1rem; }
a { color: var(--petrol-700); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--amber-700); }

strong { font-weight: 600; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 56px 0; }
.section--tight { padding: 36px 0; }

.eyebrow {
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--amber-700);
  margin: 0 0 .6rem;
}

.lead { font-size: var(--fs-lead); color: var(--slate); max-width: 60ch; }
.muted { color: var(--slate-500); }
.small { font-size: .9rem; }

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--ground);
  position: sticky;
  top: 0;
  z-index: 40;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--petrol);
  text-decoration: none;
}
.brand:hover { color: var(--petrol); }
.brand-mark {
  width: 30px; height: 30px; flex: 0 0 30px;
}
.nav {
  display: flex;
  gap: 22px;
  align-items: center;
}
.nav a {
  font-size: .95rem;
  color: var(--slate);
  text-decoration: none;
  font-weight: 500;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--amber-700); }
.nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 640px) {
  .nav { gap: 14px; }
  .nav a.nav-hide { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--petrol) 0%, #0B2E2E 100%);
  color: #EAF3F1;
  padding: 64px 0 200px;
  position: relative;
}
.hero h1 { color: #FFFFFF; max-width: 16ch; }
.hero .lead { color: #C7DAD6; }
.hero-points {
  list-style: none;
  padding: 0; margin: 24px 0 0;
  display: flex; flex-wrap: wrap; gap: 10px 22px;
}
.hero-points li {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .95rem; color: #D8E7E4;
}
.hero-points svg { flex: 0 0 18px; color: var(--amber); }

/* Calculator pulls up over the hero on calc-led pages */
.pull-up { margin-top: -160px; position: relative; z-index: 2; }

/* ---------- Calculator ---------- */
.calc {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.calc-head {
  padding: 26px 28px 0;
}
.calc-head h2 { margin-bottom: .25rem; }
.calc-verified {
  font-size: .82rem;
  color: var(--slate-500);
  display: inline-flex; align-items: center; gap: 6px;
  margin: 0;
}
.calc-verified::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background: var(--success);
}
.calc-body { padding: 22px 28px 28px; }

.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px 20px;
}
.field { display: flex; flex-direction: column; gap: 7px; }
.field--full { grid-column: 1 / -1; }
.field label {
  font-weight: 600;
  font-size: .95rem;
  color: var(--petrol);
}
.field .hint { font-size: .82rem; color: var(--slate-500); margin: 0; }

select, input[type="text"], input[type="email"], input[type="tel"] {
  font: inherit;
  font-size: 1rem;
  color: var(--slate);
  background: var(--white);
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px 13px;
  width: 100%;
  appearance: none;
  transition: border-color .15s ease, box-shadow .15s ease;
}
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%235C6B69' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}
select:focus, input:focus {
  outline: none;
  border-color: var(--petrol);
  box-shadow: 0 0 0 3px rgba(14,58,58,.14);
}
:focus-visible {
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

/* Buttons */
.btn {
  font: inherit;
  font-weight: 600;
  font-size: 1.05rem;
  border: none;
  border-radius: var(--radius-sm);
  padding: 14px 22px;
  cursor: pointer;
  transition: background-color .15s ease, transform .05s ease;
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
}
.btn-primary {
  background: var(--amber);
  color: #2A1A06;
}
.btn-primary:hover { background: var(--amber-700); }
.btn-primary:active { transform: translateY(1px); }
.btn-block { width: 100%; }
.btn-ghost {
  background: transparent;
  color: var(--petrol);
  border: 1.5px solid var(--line);
}
.btn-ghost:hover { border-color: var(--petrol); background: var(--mist); }

.calc-actions { margin-top: 24px; }
.calc-disclaimer { font-size: .85rem; color: var(--slate-500); margin: 12px 0 0; }

/* ---------- Result card (the signature element) ---------- */
.result {
  margin-top: 26px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
     radial-gradient(120% 120% at 100% 0%, rgba(232,149,74,.10) 0%, transparent 45%),
     var(--petrol);
  color: #EAF3F1;
  overflow: hidden;
}
.result[hidden] { display: none; }
.result-top {
  padding: 26px 28px 22px;
  border-bottom: 1px solid rgba(255,255,255,.12);
}
.result-eyebrow {
  font-size: var(--fs-eyebrow);
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--amber); font-weight: 600; margin: 0 0 14px;
}
.result-headline { margin: 0; }
.result-headline .label {
  display: block; font-family: 'Inter', sans-serif;
  font-size: .95rem; font-weight: 500; color: #B8CEC9; margin-bottom: 4px;
}
.result-cost {
  font-family: 'Fraunces', Georgia, serif;
  font-weight: 600;
  font-size: var(--fs-mega);
  line-height: 1.02;
  color: #FFFFFF;
  letter-spacing: -0.02em;
}
.result-cost .pre {
  display: block; font-size: 1rem; font-weight: 500; color: #B8CEC9;
  font-family: 'Inter', sans-serif; margin-bottom: 2px;
}
.result-grid {
  padding: 22px 28px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px 24px;
}
.result-row .k {
  font-size: .85rem; color: #B8CEC9; margin: 0 0 3px;
  display: flex; align-items: center; gap: 6px;
}
.result-row .v {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 1.5rem; font-weight: 600; color: #FFFFFF;
}
.result-row .v small { font-size: .9rem; font-weight: 500; color: #C7DAD6; font-family: 'Inter',sans-serif; }
.result-note {
  padding: 0 28px 24px;
  font-size: .88rem; color: #C7DAD6; line-height: 1.55;
}
.result-note p { margin: 0 0 .5rem; }
.result-note p:last-child { margin: 0; }

/* ---------- Lead gate / form ---------- */
.gate {
  margin-top: 22px;
  background: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
}
.gate[hidden] { display: none; }
.gate h3 { margin-top: 0; }
.trust-row {
  list-style: none; padding: 0; margin: 0 0 20px;
  display: flex; flex-wrap: wrap; gap: 8px 18px;
}
.trust-row li {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: .9rem; font-weight: 500; color: var(--petrol);
}
.trust-row svg { flex: 0 0 17px; color: var(--success); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 18px; }
.consent {
  grid-column: 1 / -1;
  display: flex; gap: 11px; align-items: flex-start;
  font-size: .92rem; color: var(--slate);
}
.consent input { margin-top: 3px; width: 18px; height: 18px; flex: 0 0 18px; accent-color: var(--petrol); }
.form-actions { grid-column: 1/-1; margin-top: 4px; }
.form-msg { grid-column: 1/-1; border-radius: var(--radius-sm); padding: 13px 15px; font-size: .95rem; margin: 0; }
.form-msg[hidden] { display: none; }
.form-msg.is-error { background: var(--error-bg); color: var(--error); }

.gate-success {
  text-align: center; padding: 14px 8px;
}
.gate-success[hidden] { display: none; }
.gate-success .check {
  width: 54px; height: 54px; border-radius: 50%;
  background: var(--success-bg); color: var(--success);
  display: grid; place-items: center; margin: 0 auto 16px;
}
.gate-success h3 { color: var(--success); }

/* ---------- Generic content blocks ---------- */
.prose { max-width: 70ch; }
.prose h2 { margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.25em; margin: 0 0 1rem; }
.prose li { margin-bottom: .4rem; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px;
}
.card h3 { margin-top: 0; font-size: 1.2rem; }
.card p:last-child { margin-bottom: 0; }
.card .num {
  font-family: 'Fraunces', serif; font-size: 2rem; color: var(--amber-700);
  display: block; margin-bottom: 6px; line-height: 1;
}

.panel {
  background: var(--mist); border-radius: var(--radius);
  padding: 28px; border: 1px solid var(--line);
}
.callout {
  border-left: 3px solid var(--amber);
  background: var(--white);
  padding: 16px 20px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0; font-size: .96rem;
}

/* comparison table */
.cmp { width: 100%; border-collapse: collapse; margin: 8px 0 4px; font-size: .98rem; }
.cmp caption { text-align: left; color: var(--slate-500); font-size: .85rem; margin-bottom: 10px; }
.cmp th, .cmp td { text-align: left; padding: 13px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.cmp thead th { color: var(--petrol); font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; }
.cmp tbody th { font-weight: 600; color: var(--slate); width: 30%; }

/* FAQ */
.faq { max-width: 760px; }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 6px 0;
}
.faq summary {
  cursor: pointer; list-style: none;
  font-family: 'Fraunces', serif; font-size: 1.15rem; font-weight: 600; color: var(--petrol);
  padding: 14px 36px 14px 0; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 6px; top: 12px;
  font-family: 'Inter',sans-serif; font-size: 1.6rem; font-weight: 400; color: var(--amber-700);
  transition: transform .2s ease;
}
.faq details[open] summary::after { content: "\2013"; }
.faq details p { margin: 0 0 16px; color: var(--slate); }

.section-alt { background: var(--mist); }
.center { text-align: center; }
.center .lead { margin-left: auto; margin-right: auto; }

/* CTA strip */
.cta-strip {
  background: var(--petrol); color: #EAF3F1; text-align: center;
  border-radius: var(--radius); padding: 40px 28px;
}
.cta-strip h2 { color: #fff; }
.cta-strip .lead { color: #C7DAD6; margin: 0 auto 22px; }

/* ---------- Footer ---------- */
.site-footer {
  background: #0B2E2E; color: #A9C2BD;
  padding: 44px 0 36px; margin-top: 40px;
  font-size: .92rem;
}
.site-footer a { color: #CFE0DC; }
.footer-grid { display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; }
.footer-grid nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.footer-brand { font-family: 'Fraunces', serif; color: #fff; font-size: 1.15rem; margin-bottom: 6px; }
.footer-legal { margin-top: 26px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); font-size: .82rem; color: #84A29C; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  :root {
    --fs-h1: 2.1rem;
    --fs-h2: 1.6rem;
    --fs-mega: 2.7rem;
  }
  .calc-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
  .hero { padding: 44px 0 180px; }
  .calc-body, .calc-head { padding-left: 20px; padding-right: 20px; }
  .gate { padding: 22px 20px; }
  .result-top, .result-grid, .result-note { padding-left: 20px; padding-right: 20px; }
}
@media (max-width: 420px) {
  .wrap { padding: 0 16px; }
}