/* Layout: site header + content column; calculator pages use a two-column quiz with a live estimate panel; guides use a single reading column with data tables. */
:root {
  --paper: #eef3f8;
  --surface: #ffffff;
  --ink: #0f1d2e;
  --muted: #566577;
  --line: #d4dde8;
  --panel: #1b3d6b;
  --on-panel: #ffffff;
  --panel-soft: #e2ebf6;
  --sun: #e99a12;
  --sun-soft: #fdf1da;
  --sun-ink: #7a4800;
  --good: #1d7d52;
  --good-soft: #def2e8;
  --warn: #9a6100;
  --warn-soft: #fbefd9;
  --bad: #b23a30;
  --opt0: #8593a3;
  --opt1: #2f74c8;
  --opt2: #e99a12;
  --roof: #5b6b7d;
  --wall: #dfe6ee;
  --font-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --font-body: "Public Sans", "Segoe UI", system-ui, sans-serif;
  --font-data: "IBM Plex Mono", ui-monospace, Consolas, monospace;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0b1420; --surface: #122031; --ink: #e7eef6; --muted: #9badc0; --line: #243649;
    --panel: #86b4ee; --on-panel: #0b1420; --panel-soft: #1a2f49;
    --sun: #f4b545; --sun-soft: #33270f; --sun-ink: #f8cf85;
    --good: #5cc795; --good-soft: #12301f; --warn: #f0b85a; --warn-soft: #33270f; --bad: #f08379;
    --opt0: #8696a8; --opt1: #6fa6ea; --opt2: #f4b545; --roof: #3b4b5d; --wall: #1d2d40;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font-body); font-size: 16px; line-height: 1.6; }
img { max-width: 100%; }
[hidden] { display: none !important; }
a { color: var(--panel); text-underline-offset: 2px; }
a:hover { color: var(--sun-ink); }
.wrap { max-width: 1120px; margin: 0 auto; padding-inline: 20px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 10; background: var(--surface); padding: 8px 12px; border-radius: 6px; }

/* Header */
.site-head { background: var(--surface); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 24px; padding-block: 14px; }
.brand { display: flex; gap: 10px; align-items: center; font-family: var(--font-display); font-weight: 750; font-size: 1.12rem; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; }
.brand svg { width: 30px; height: 30px; flex: none; }
.brand small { font-family: var(--font-data); font-weight: 500; font-size: 0.72rem; color: var(--muted); letter-spacing: 0; }
.site-nav ul { display: flex; flex-wrap: wrap; gap: 4px 18px; list-style: none; margin: 0; padding: 0; font-size: 0.92rem; font-weight: 600; }
.site-nav a { color: var(--ink); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { border-color: var(--sun); color: var(--ink); }

/* Breadcrumbs */
.crumbs { font-size: 0.82rem; color: var(--muted); padding-top: 18px; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: var(--line); }
.crumbs a { color: var(--muted); }

/* Hero / intro */
.intro { padding-block: 26px 20px; max-width: 48rem; }
h1, h2, h3 { font-family: var(--font-display); letter-spacing: -0.02em; text-wrap: balance; margin: 0; line-height: 1.15; }
h1 { font-size: clamp(1.9rem, 4.2vw, 2.9rem); font-weight: 750; }
h1 em { font-style: normal; color: var(--sun-ink); background: linear-gradient(transparent 62%, var(--sun-soft) 62%); }
.intro p { color: var(--muted); margin: 12px 0 0; font-size: 1.06rem; }
.updated { font-family: var(--font-data); font-size: 0.78rem; color: var(--muted); margin-top: 10px; }
.promise { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 0.88rem; color: var(--muted); list-style: none; margin: 14px 0 0; padding: 0; }
.promise li::before { content: "✓"; color: var(--good); font-weight: 700; margin-right: 6px; }

.example-note { display: flex; gap: 10px; align-items: flex-start; background: var(--sun-soft); color: var(--sun-ink); border-radius: var(--radius); padding: 10px 14px; font-size: 0.9rem; margin-bottom: 18px; }
.example-note b { font-weight: 700; }

/* Calculator */
.layout { display: grid; gap: 24px; align-items: start; }
@media (min-width: 920px) { .layout { grid-template-columns: minmax(0, 1fr) 340px; } }
.flow { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px; min-width: 0; scroll-margin-top: 16px; }
@media (min-width: 600px) { .flow { padding: 30px 32px; } }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; list-style: none; margin: 0 0 26px; padding: 0; counter-reset: s; }
.steps li { counter-increment: s; font-size: 0.78rem; font-weight: 600; color: var(--muted); padding-top: 9px; border-top: 4px solid var(--line); letter-spacing: 0.02em; }
.steps li::before { content: counter(s) " · "; font-family: var(--font-data); }
.steps li.done { border-color: var(--panel); color: var(--ink); }
.steps li.now { border-color: var(--sun); color: var(--ink); }
@media (max-width: 480px) { .steps li span { display: none; } .steps li::before { content: "Step " counter(s); } }

.step h2 { font-size: 1.55rem; font-weight: 750; }
.step p.lede { color: var(--muted); margin: 6px 0 22px; }
.q { border: 0; margin: 0 0 24px; padding: 0; min-width: 0; }
.q legend, .q > label.qlabel { font-weight: 600; margin-bottom: 10px; display: block; padding: 0; }
.q .hint { font-size: 0.85rem; color: var(--muted); margin: -6px 0 10px; }

.chips { display: grid; gap: 8px; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); }
.chips.tight { grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); }
.chip { position: relative; display: flex; flex-direction: column; gap: 2px; border: 1.5px solid var(--line); border-radius: var(--radius); padding: 11px 13px; cursor: pointer; background: var(--surface); transition: border-color .15s, background .15s; }
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip span { font-weight: 600; font-size: 0.95rem; line-height: 1.3; }
.chip small { color: var(--muted); font-size: 0.78rem; line-height: 1.35; }
.chip:hover { border-color: var(--panel); }
.chip:has(input:checked) { border-color: var(--panel); background: var(--panel-soft); box-shadow: inset 0 0 0 1px var(--panel); }
.chip:has(input:focus-visible) { outline: 3px solid var(--sun); outline-offset: 2px; }
.chip .dir { font-family: var(--font-data); font-size: 0.75rem; }

input[type="text"], input[type="email"], input[type="tel"], input[type="number"], select {
  width: 100%; font: inherit; color: var(--ink); background: var(--surface); border: 1.5px solid var(--line); border-radius: var(--radius); padding: 11px 13px;
}
input:focus-visible, select:focus-visible { outline: 3px solid var(--sun); outline-offset: 1px; border-color: var(--panel); }
#postcode { max-width: 14rem; text-transform: uppercase; font-family: var(--font-data); letter-spacing: 0.04em; font-size: 1.1rem; }
.err { color: var(--bad); font-size: 0.85rem; margin-top: 6px; min-height: 1.2em; }
.found { color: var(--good); font-size: 0.85rem; margin-top: 6px; }

.bill-row { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.bill-row input[type="range"] { flex: 1 1 220px; accent-color: var(--panel); height: 28px; }
.bill-out { font-family: var(--font-data); font-size: 1.5rem; min-width: 6.5ch; font-variant-numeric: tabular-nums; }
.bill-out small { font-family: var(--font-body); font-size: 0.8rem; color: var(--muted); }

.nav { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; border-top: 1px solid var(--line); padding-top: 20px; margin-top: 8px; }
.nav .mini { font-size: 0.88rem; color: var(--muted); }
.nav .mini b { color: var(--ink); font-family: var(--font-data); }
.btns { display: flex; gap: 10px; margin-left: auto; }
button { font: inherit; cursor: pointer; }
.btn { display: inline-block; border: 0; border-radius: var(--radius); padding: 12px 22px; font-weight: 700; font-size: 1rem; text-decoration: none; text-align: center; }
.btn-primary { background: var(--panel); color: var(--on-panel); }
.btn-primary:hover { filter: brightness(1.1); color: var(--on-panel); }
.btn-sun { background: var(--sun); color: #2a1900; width: 100%; padding: 15px 22px; font-size: 1.08rem; }
.btn-sun:hover { filter: brightness(1.06); color: #2a1900; }
.btn-sun:disabled { opacity: 0.7; cursor: progress; }
.btn-ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.btn:focus-visible { outline: 3px solid var(--sun); outline-offset: 2px; }

.est { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px; min-width: 0; }
@media (min-width: 920px) { .est { position: sticky; top: 16px; } }
.est-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; color: var(--muted); }
.fit { display: inline-flex; align-items: center; gap: 7px; font-weight: 700; font-size: 0.85rem; border-radius: 999px; padding: 4px 12px 4px 10px; }
.fit::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.fit.great { background: var(--good-soft); color: var(--good); }
.fit.good { background: var(--panel-soft); color: var(--panel); }
.fit.check { background: var(--warn-soft); color: var(--warn); }
.est-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.house { margin: 14px 0 6px; background: var(--paper); border-radius: var(--radius); }
.house svg { display: block; width: 100%; height: auto; }
.big { margin-top: 12px; }
.big .num { font-family: var(--font-display); font-weight: 750; font-size: 2.6rem; line-height: 1; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.big .num small { font-size: 1rem; font-family: var(--font-body); font-weight: 500; color: var(--muted); letter-spacing: 0; }
.big p { margin: 4px 0 0; font-size: 0.85rem; color: var(--muted); }
.kv { list-style: none; margin: 16px 0 0; padding: 0; }
.kv li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-top: 1px solid var(--line); font-size: 0.9rem; }
.kv li span:first-child { color: var(--muted); }
.kv li span:last-child { font-family: var(--font-data); font-variant-numeric: tabular-nums; text-align: right; }

.flags { list-style: none; padding: 0; margin: 0 0 24px; display: grid; gap: 8px; }
.flags li { display: flex; gap: 10px; font-size: 0.92rem; padding: 10px 12px; border-radius: var(--radius); background: var(--paper); }
.flags li::before { flex: none; font-weight: 700; width: 1ch; text-align: center; }
.flags li.ok::before { content: "✓"; color: var(--good); }
.flags li.note::before { content: "!"; color: var(--warn); }
h3.sub { font-size: 1.2rem; }
h3.sub-sm { font-size: 1.05rem; }

.opts { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); margin: 16px 0 6px; }
.opt { border: 1.5px solid var(--line); border-radius: 12px; padding: 16px; display: flex; flex-direction: column; gap: 10px; position: relative; }
.opt.best { border-color: var(--sun); box-shadow: inset 0 0 0 1px var(--sun); }
.opt .tag { position: absolute; top: -11px; left: 14px; background: var(--sun); color: #2a1900; font-size: 0.72rem; font-weight: 700; padding: 2px 9px; border-radius: 999px; letter-spacing: 0.03em; }
.opt h3 { font-size: 1.05rem; font-weight: 750; display: flex; align-items: center; gap: 8px; }
.opt h3 i { width: 12px; height: 12px; border-radius: 3px; flex: none; }
.opt dl { margin: 0; display: grid; grid-template-columns: 1fr auto; gap: 6px 10px; font-size: 0.88rem; }
.opt dt { color: var(--muted); }
.opt dd { margin: 0; font-family: var(--font-data); text-align: right; font-variant-numeric: tabular-nums; }
.opt dd.hi { color: var(--good); font-weight: 600; }

.chart-box { margin: 22px 0 8px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 0.82rem; color: var(--muted); margin: 6px 0 4px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.chart-scroll { overflow-x: auto; }
.chart-scroll svg { display: block; width: 100%; min-width: 460px; height: auto; }
.chart-scroll text { font-family: var(--font-data); font-size: 11px; fill: var(--muted); }

.wait { display: flex; gap: 16px; align-items: center; background: var(--panel); color: var(--on-panel); border-radius: 12px; padding: 16px 20px; margin: 22px 0; flex-wrap: wrap; }
.wait .num { font-family: var(--font-display); font-weight: 750; font-size: 2rem; line-height: 1; font-variant-numeric: tabular-nums; }
.wait p { margin: 0; flex: 1 1 220px; font-size: 0.95rem; }

.lead { border: 1.5px solid var(--line); border-radius: 14px; padding: 22px; background: var(--paper); }
.lead h3 { font-size: 1.35rem; font-weight: 750; }
.lead > p { color: var(--muted); margin: 6px 0 18px; font-size: 0.95rem; }
.fields { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.field label { display: block; font-weight: 600; font-size: 0.88rem; margin-bottom: 5px; }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: 0.85rem; color: var(--muted); margin: 16px 0; }
.consent input { margin-top: 4px; accent-color: var(--panel); width: 18px; height: 18px; flex: none; }
.trust { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 18px; font-size: 0.8rem; color: var(--muted); margin-top: 12px; }
.trust span::before { content: "✓ "; color: var(--good); font-weight: 700; }
.done-card h3 { font-size: 1.5rem; }
.done-card .ref { font-family: var(--font-data); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 2px 8px; }
.done-card ol { padding-left: 1.2rem; margin: 14px 0 0; }
.done-card ol li { margin-bottom: 6px; }

/* Guide content */
.content { padding-block: 40px 20px; }
.prose { max-width: 46rem; }
.prose h2 { font-size: clamp(1.45rem, 2.6vw, 1.85rem); font-weight: 750; margin: 44px 0 12px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 1.18rem; font-weight: 750; margin: 28px 0 8px; }
.prose p, .prose li { font-size: 1.02rem; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin-bottom: 6px; }
.prose .callout { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--sun); border-radius: 0 var(--radius) var(--radius) 0; padding: 14px 18px; margin: 20px 0; }
.prose .callout p { margin: 0; }
.prose .callout p + p { margin-top: 8px; }

.table-wrap { overflow-x: auto; margin: 18px 0 6px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); background: var(--paper); font-weight: 700; }
td.n, th.n { text-align: right; font-family: var(--font-data); font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: 0; }
.table-note { font-size: 0.82rem; color: var(--muted); margin: 6px 0 0; }

.faq { margin-top: 12px; }
.faq details { border-top: 1px solid var(--line); padding: 14px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 700; font-size: 1.05rem; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::after { content: "+"; font-family: var(--font-data); color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq summary::-webkit-details-marker { display: none; }
.faq details > p, .faq details > ul { margin: 10px 0 0; }

.cta-band { background: var(--panel); color: var(--on-panel); border-radius: 14px; padding: 26px; display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; justify-content: space-between; margin: 40px 0 10px; }
.cta-band h2 { font-size: 1.5rem; margin: 0; }
.cta-band p { margin: 6px 0 0; opacity: 0.9; }
.cta-band .btn { background: var(--sun); color: #2a1900; }

.cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); margin: 18px 0; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 18px; text-decoration: none; color: var(--ink); display: flex; flex-direction: column; gap: 6px; }
.card:hover { border-color: var(--panel); color: var(--ink); }
.card strong { font-family: var(--font-display); font-size: 1.08rem; }
.card span { color: var(--muted); font-size: 0.92rem; }

/* Small tools on guide pages */
.mini-tool { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px; margin: 22px 0; }
.mini-tool h2, .mini-tool h3 { margin-top: 0; }
.mini-tool .q { margin-bottom: 18px; }
.mini-result { border-radius: var(--radius); padding: 14px 16px; margin-top: 8px; font-size: 0.98rem; }
.mini-result.good { background: var(--good-soft); }
.mini-result.maybe { background: var(--warn-soft); }
.mini-result.no { background: var(--paper); }
.mini-result strong { display: block; font-family: var(--font-display); font-size: 1.15rem; margin-bottom: 4px; }
.mini-result .big-n { font-family: var(--font-display); font-weight: 750; font-size: 2.2rem; line-height: 1.1; }

/* Footer */
.site-foot { border-top: 1px solid var(--line); margin-top: 48px; padding-block: 30px 40px; font-size: 0.88rem; color: var(--muted); background: var(--surface); }
.site-foot .cols { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.site-foot h2 { font-size: 0.95rem; color: var(--ink); margin-bottom: 8px; letter-spacing: 0; }
.site-foot ul { list-style: none; margin: 0; padding: 0; }
.site-foot li { margin-bottom: 4px; }
.site-foot a { color: var(--muted); }
.site-foot .small { margin-top: 24px; font-size: 0.8rem; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }

/* Cookie consent bar */
.consent-bar { position: fixed; left: 16px; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom, 0px)); z-index: 20; max-width: 640px; margin: 0 auto; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 8px 30px rgba(15, 29, 46, 0.18); padding: 14px 16px; display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; justify-content: space-between; font-size: 0.9rem; }
.consent-bar p { margin: 0; flex: 1 1 260px; }
.consent-btns { display: flex; gap: 8px; }
.consent-btns .btn { padding: 9px 18px; font-size: 0.92rem; }