/* ===== House Extension Cost Calculator UK - shared styles v2 ===== */
:root{
  --ink:#132133; --ink-2:#20395B;
  --paper:#F1F4F8; --paper-2:#FFFFFF; --paper-3:#E9EEF4;
  --line:#DCE2EA; --line-2:#C4CDD8;
  --amber:#F5A623; --amber-deep:#D98E10; --amber-soft:#FDF0D6;
  --muted:#5B6A7B; --muted-2:#7C8A9A;
  --ok:#2E7D5B; --err:#C0392B;
  --radius:16px; --radius-sm:11px;
  --shadow-sm:0 1px 2px rgba(19,33,51,.06);
  --shadow:0 2px 4px rgba(19,33,51,.04), 0 10px 34px rgba(19,33,51,.10);
  --shadow-lg:0 4px 8px rgba(19,33,51,.05), 0 24px 60px rgba(19,33,51,.16);
  --maxw:1120px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:'Raleway',system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--paper);line-height:1.62;-webkit-font-smoothing:antialiased;font-size:16px}
h1,h2,h3,h4,.font-head{font-family:'Poppins',system-ui,sans-serif}
a{color:var(--ink-2)}
img,svg{max-width:100%}
::selection{background:var(--amber-soft)}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.narrow{max-width:780px;margin:0 auto;padding:0 22px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--line)}
.hd{display:flex;align-items:center;justify-content:space-between;gap:16px;height:70px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:700;font-family:'Poppins',sans-serif;font-size:15.5px;letter-spacing:-.01em}
.brand svg{width:36px;height:36px;flex:none;filter:drop-shadow(0 2px 4px rgba(19,33,51,.18))}
.brand span b{color:var(--ink);line-height:1.15;display:block}
.brand span i{display:block;font-style:normal;font-weight:500;font-size:11px;color:var(--muted-2);letter-spacing:.03em;margin-top:1px}
.nav{display:flex;align-items:center;gap:2px}
.nav a{font-family:'Raleway',sans-serif;font-size:14px;font-weight:600;color:var(--muted);text-decoration:none;padding:9px 13px;border-radius:9px;transition:.14s}
.nav a:hover{color:var(--ink);background:var(--paper)}
.nav a.active{color:var(--ink-2);background:var(--amber-soft)}
.navtoggle{display:none;background:none;border:1px solid var(--line-2);border-radius:10px;padding:8px 10px;cursor:pointer}
.navtoggle svg{width:20px;height:20px;display:block}
@media (max-width:860px){
  .navtoggle{display:block}
  .nav{position:absolute;top:70px;left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;background:var(--paper-2);border-bottom:1px solid var(--line);padding:12px 16px;box-shadow:var(--shadow);display:none}
  .nav.open{display:flex}
  .nav a{padding:13px}
}

/* hero */
.hero{position:relative;padding:52px 0 12px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(120% 90% at 82% -10%, rgba(245,166,35,.10), transparent 55%),
    repeating-linear-gradient(0deg,transparent,transparent 31px,rgba(32,57,91,.045) 31px,rgba(32,57,91,.045) 32px),
    repeating-linear-gradient(90deg,transparent,transparent 31px,rgba(32,57,91,.045) 31px,rgba(32,57,91,.045) 32px);
  mask-image:linear-gradient(180deg,#000 0%,#000 42%,transparent 78%);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,#000 42%,transparent 78%);}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:12.5px;font-weight:700;color:var(--ink-2);border:1px solid var(--line-2);border-radius:999px;padding:6px 14px;background:var(--paper-2);box-shadow:var(--shadow-sm)}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px rgba(46,125,91,.16)}
h1{font-weight:700;font-size:clamp(31px,5.2vw,52px);line-height:1.05;letter-spacing:-.02em;margin:18px 0 14px;max-width:16ch}
.hero .trust{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0 0 4px;font-size:13.5px;color:var(--muted);font-weight:600}
.hero .trust span{display:inline-flex;align-items:center;gap:7px}
.hero .trust svg{width:16px;height:16px;color:var(--ok)}

/* calculator */
.calc{margin:26px 0 0;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden;scroll-margin-top:88px}
.stepbar{display:flex;align-items:center;gap:14px;padding:17px 26px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,#FBFCFE,var(--paper-2))}
.sdot{display:flex;align-items:center;gap:9px;font-size:13px;font-weight:600;color:var(--muted);font-family:'Poppins',sans-serif}
.sdot .n{width:25px;height:25px;border-radius:50%;display:grid;place-items:center;font-size:12.5px;background:var(--paper);border:1px solid var(--line-2);color:var(--muted);transition:.2s}
.sdot.on{color:var(--ink)} .sdot.on .n{background:var(--ink);border-color:var(--ink);color:#fff;box-shadow:0 0 0 4px rgba(19,33,51,.08)}
.sdot.done .n{background:var(--ok);border-color:var(--ok);color:#fff}
.sline{flex:1;height:2px;background:var(--line);border-radius:2px}
.step{padding:26px}
.step.hidden{display:none}
.step h2{font-weight:600;font-size:21px;margin:0 0 4px;letter-spacing:-.01em}
.step p.sub{margin:0 0 22px;color:var(--muted);font-size:14px}
.field{margin-bottom:19px}
label.lab{display:block;font-size:13.5px;font-weight:700;color:var(--ink);margin-bottom:8px;font-family:'Raleway',sans-serif}
.hint{font-size:12.5px;color:var(--muted);margin-top:7px}
select,input[type=number],input[type=text],input[type=email],input[type=tel]{width:100%;font:inherit;font-size:15px;color:var(--ink);background:var(--paper-2);border:1.5px solid var(--line-2);border-radius:var(--radius-sm);padding:12.5px 14px;appearance:none;transition:border-color .14s,box-shadow .14s;font-family:'Raleway',sans-serif}
select{background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%235B6A7B' stroke-width='2.4'><path d='M6 9l6 6 6-6'/></svg>");background-repeat:no-repeat;background-position:right 13px center;padding-right:40px;cursor:pointer}
select:hover{border-color:var(--muted-2)}
select:focus,input:focus{outline:none;border-color:var(--ink-2);box-shadow:0 0 0 4px rgba(32,57,91,.13)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:13px}
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.seg button{font:inherit;font-family:'Raleway',sans-serif;font-size:13.5px;font-weight:700;cursor:pointer;padding:12px 6px;border:1.5px solid var(--line-2);border-radius:var(--radius-sm);background:var(--paper-2);color:var(--muted);transition:.14s;line-height:1.2}
.seg button:hover{border-color:var(--muted-2);color:var(--ink)}
.seg button .sub2{display:block;font-weight:600;font-size:11.5px;margin-top:3px;color:var(--muted-2)}
.seg button[aria-pressed=true]{border-color:var(--ink);background:var(--ink);color:#fff;box-shadow:0 6px 16px rgba(19,33,51,.20)}
.seg button[aria-pressed=true] .sub2{color:#AEBCCB}
.seg button:focus-visible{outline:none;box-shadow:0 0 0 4px rgba(32,57,91,.18)}
.linkbtn{background:none;border:none;padding:0;color:var(--ink-2);font:inherit;font-family:'Raleway',sans-serif;font-size:13px;font-weight:700;cursor:pointer;text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--amber)}
.dims{margin-top:12px;display:none}.dims.open{display:block}
.row-check{display:flex;align-items:flex-start;gap:11px;padding:14px;border:1.5px solid var(--line);border-radius:var(--radius-sm);background:#FBFCFE}
.row-check input{width:19px;height:19px;margin-top:1px;accent-color:var(--ink)}
.row-check label{font-size:14px;color:var(--ink);font-weight:600}
.errmsg{color:var(--err);font-size:12.5px;margin-top:6px;display:none;font-weight:600}
.field.invalid input{border-color:var(--err);box-shadow:0 0 0 4px rgba(192,57,43,.10)}
.field.invalid .errmsg{display:block}
.req{color:var(--err)}
.consent{display:flex;align-items:flex-start;gap:12px;margin:4px 0 0}
.consent input{width:19px;height:19px;margin-top:2px;accent-color:var(--ink);flex:none}
.consent label{font-size:13px;color:var(--muted);line-height:1.55}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.actions{display:flex;gap:12px;align-items:center;margin-top:26px}
.btn{font:inherit;font-family:'Poppins',sans-serif;font-weight:600;font-size:15px;cursor:pointer;border:none;border-radius:var(--radius-sm);padding:14px 26px;transition:.14s;text-decoration:none;display:inline-block;text-align:center;letter-spacing:.01em}
.btn-primary{background:var(--amber);color:#231A05;box-shadow:0 8px 20px rgba(245,166,35,.34)}
.btn-primary:hover{background:var(--amber-deep);transform:translateY(-1px);box-shadow:0 12px 26px rgba(245,166,35,.42)}
.btn-primary:focus-visible{outline:none;box-shadow:0 0 0 4px rgba(245,166,35,.45)}
.btn-ink{background:var(--ink);color:#fff;box-shadow:0 8px 20px rgba(19,33,51,.24)}
.btn-ink:hover{background:var(--ink-2);transform:translateY(-1px)}
.btn-ghost{background:none;color:var(--muted);padding:14px 10px;box-shadow:none}
.btn-ghost:hover{color:var(--ink)}
.spacer{flex:1}
.result{padding:0}.result.hidden{display:none}
.rtop{background:linear-gradient(155deg,#1B2E49 0%,#132133 60%);color:#fff;padding:30px 26px;position:relative;overflow:hidden}
.rtop::after{content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,rgba(245,166,35,.22),transparent 68%)}
.rtop .cap{font-size:12.5px;color:#9DB0C6;margin:0 0 8px;font-weight:600;letter-spacing:.03em;position:relative}
.figure{font-family:'Poppins',sans-serif;font-weight:700;font-size:clamp(32px,5.4vw,46px);line-height:1.02;letter-spacing:-.02em;position:relative}
.figure .amb{color:var(--amber)}
.basis{font-size:13px;color:#9DB0C6;margin:12px 0 0;position:relative}
.brk{padding:22px 26px 8px;font-size:13.5px}
.brk .li{display:flex;justify-content:space-between;gap:14px;padding:10px 0;border-bottom:1px solid var(--line)}
.brk .li span:first-child{color:var(--muted)}
.brk .li span:last-child{font-weight:600;font-variant-numeric:tabular-nums}
.brk .li.total{font-weight:700;color:var(--ink);font-size:16px;border-bottom:none;padding-top:14px;font-family:'Poppins',sans-serif}
.brk .li.total span:first-child{color:var(--ink)}
.brk .li.total span:last-child{color:var(--ink-2)}
.vat{padding:2px 26px 0;font-size:12px;color:var(--muted);line-height:1.55}
.rfoot{padding:18px 26px 26px}
.sent{background:#EAF5EF;border:1px solid #BCDECB;border-radius:var(--radius-sm);padding:15px 17px;color:#1C5A3E;font-size:13.5px;margin-bottom:16px;font-weight:600}

/* how it works */
.hiw{margin:26px 0 0;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.hiw .card{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:22px 20px;box-shadow:var(--shadow-sm);transition:.16s}
.hiw .card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.hiw .ic{width:44px;height:44px;border-radius:12px;background:var(--amber-soft);display:grid;place-items:center;margin-bottom:14px}
.hiw .ic svg{width:23px;height:23px;color:var(--amber-deep)}
.hiw h3{font-size:15.5px;margin:0 0 5px;letter-spacing:-.01em}
.hiw p{font-size:13.5px;color:var(--muted);margin:0;line-height:1.55}
@media (max-width:720px){.hiw{grid-template-columns:1fr}}

/* stats strip */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:30px 0 0;background:var(--ink);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.stats .s{padding:24px 22px;border-right:1px solid rgba(255,255,255,.10)}
.stats .s:last-child{border-right:none}
.stats .v{font-family:'Poppins',sans-serif;font-weight:700;font-size:clamp(22px,3vw,29px);color:#fff;letter-spacing:-.01em;line-height:1}
.stats .v em{color:var(--amber);font-style:normal}
.stats .k{font-size:12.5px;color:#9DB0C6;margin-top:7px;font-weight:600}
@media (max-width:620px){.stats{grid-template-columns:1fr}.stats .s{border-right:none;border-bottom:1px solid rgba(255,255,255,.10)}.stats .s:last-child{border-bottom:none}}

/* table of contents layout */
.layout{display:grid;grid-template-columns:230px 1fr;gap:42px;align-items:start}
.toc{position:sticky;top:88px;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:20px 18px;box-shadow:var(--shadow-sm)}
.toc h4{font-family:'Poppins',sans-serif;font-size:12px;font-weight:700;color:var(--muted-2);letter-spacing:.06em;text-transform:uppercase;margin:0 0 12px}
.toc ul{list-style:none;margin:0;padding:0}
.toc a{display:block;font-size:13.5px;color:var(--muted);text-decoration:none;padding:7px 10px;border-radius:8px;border-left:2px solid transparent;transition:.14s;font-weight:600}
.toc a:hover{background:var(--paper);color:var(--ink)}
.toc a.active{color:var(--ink-2);background:var(--amber-soft);border-left-color:var(--amber)}
@media (max-width:900px){.layout{grid-template-columns:1fr;gap:0}.toc{display:none}}

/* article content */
.content{padding:52px 0 8px}
.content h2{font-weight:600;font-size:clamp(23px,3.1vw,31px);line-height:1.15;letter-spacing:-.015em;margin:52px 0 16px;padding-top:10px;scroll-margin-top:86px}
.content h2::before{content:"";display:block;width:44px;height:3px;background:var(--amber);border-radius:3px;margin-bottom:16px}
.content > h2:first-child{margin-top:0}
.content h3{font-weight:600;font-size:clamp(18px,2.2vw,22px);margin:32px 0 9px;letter-spacing:-.01em;color:var(--ink)}
.content p{margin:0 0 16px;max-width:70ch}
.content ul,.content ol{margin:0 0 18px;padding-left:4px;max-width:70ch;list-style:none}
.content ul li,.content ol li{position:relative;padding-left:30px;margin-bottom:10px}
.content ul li::before{content:"";position:absolute;left:6px;top:10px;width:7px;height:7px;background:var(--amber);border-radius:2px;transform:rotate(45deg)}
.content ol{counter-reset:li}
.content ol li{counter-increment:li}
.content ol li::before{content:counter(li);position:absolute;left:0;top:1px;width:22px;height:22px;background:var(--ink);color:#fff;border-radius:7px;font-size:12px;font-weight:700;font-family:'Poppins',sans-serif;display:grid;place-items:center}
.content strong{font-weight:700;color:var(--ink);background:linear-gradient(180deg,transparent 62%,var(--amber-soft) 62%);padding:0 2px}
.tablewrap{overflow-x:auto;margin:6px 0 22px;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
table{border-collapse:collapse;width:100%;font-size:14px;background:var(--paper-2);min-width:420px}
th,td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--line)}
th{font-family:'Poppins',sans-serif;font-weight:600;font-size:12.5px;color:#fff;background:var(--ink);letter-spacing:.01em}
td:last-child{font-variant-numeric:tabular-nums}
tbody tr:nth-child(even){background:#F7F9FB}
tr:last-child td{border-bottom:none}
.disclaimer{font-size:13px;color:var(--muted);font-style:italic;border-top:1px solid var(--line);padding-top:20px;margin-top:34px;max-width:80ch}

/* FAQ */
.faq{margin-top:8px}
.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--paper-2);margin-bottom:11px;overflow:hidden;transition:.16s;box-shadow:var(--shadow-sm)}
.faq details[open]{box-shadow:var(--shadow)}
.faq summary{cursor:pointer;list-style:none;padding:17px 20px;font-family:'Poppins',sans-serif;font-weight:500;font-size:15.5px;display:flex;justify-content:space-between;gap:14px;align-items:center;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--amber-deep);font-weight:400;line-height:1;flex:none}
.faq details[open] summary::after{content:"\2013"}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq .ans{padding:15px 20px 19px;color:var(--muted);font-size:14.5px}
.faq .ans p{margin:0;max-width:none}

/* lead note */
.lead-note{background:var(--amber-soft);border:1px solid #F0DDB0;border-radius:var(--radius-sm);padding:15px 17px;margin:0 0 20px}
.lead-note p{margin:0;font-size:13px;color:#6B5320;line-height:1.55}

/* legal / simple pages */
.page{padding:52px 0 20px}
.page h1{font-size:clamp(28px,4.4vw,40px);margin-bottom:8px;letter-spacing:-.02em}
.page .updated{color:var(--muted);font-size:13px;margin:0 0 30px}
.page h2{font-family:'Poppins',sans-serif;font-weight:600;font-size:22px;margin:34px 0 11px;letter-spacing:-.01em}
.page h3{font-family:'Poppins',sans-serif;font-weight:600;font-size:17px;margin:24px 0 8px}
.page p,.page li{font-size:15.5px;color:#2A3746}
.page ul{padding-left:20px}
.page li{margin-bottom:7px}
.page a{color:var(--ink-2);text-decoration-color:var(--amber)}
.contact-card{background:var(--paper-2);border:1px solid var(--line);border-left:3px solid var(--amber);border-radius:var(--radius-sm);padding:20px 22px;margin:18px 0;box-shadow:var(--shadow-sm)}
.contact-card a{font-weight:700}

/* footer */
.site-footer{margin-top:64px;background:linear-gradient(180deg,#152437,#101c2c);color:#C3D0DE}
.ft{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:36px;padding:50px 0 34px}
.site-footer .brand{color:#fff}
.site-footer .brand span b{color:#fff}
.site-footer .brand span i{color:#8497AB}
.ft .about{font-size:13.5px;color:#9DB0C6;margin:16px 0 0;max-width:44ch;line-height:1.65}
.ft h4{font-family:'Poppins',sans-serif;color:#fff;font-size:13px;font-weight:600;margin:0 0 14px;letter-spacing:.04em;text-transform:uppercase}
.ft ul{list-style:none;margin:0;padding:0}
.ft li{margin-bottom:10px}
.ft a{color:#9DB0C6;text-decoration:none;font-size:13.5px;transition:.14s}
.ft a:hover{color:var(--amber)}
.ftbar{border-top:1px solid rgba(255,255,255,.12);padding:18px 0;font-size:12.5px;color:#8497AB;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.ftbar a{color:#9DB0C6}
@media (max-width:760px){.ft{grid-template-columns:1fr;gap:28px}}

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