/* =========================================================
   BuildCalc — site.css (redesign reference)
   One shared stylesheet for every page. Tokens first, then
   base, layout, components. No frameworks.
   ========================================================= */

/* ---------- 1. Design tokens ---------- */
:root{
  /* Brand */
  --blue:#1849D6;          /* primary: hero, links, icons */
  --blue-dark:#0F35A8;     /* link hover */
  --blue-tint:#EEF3FF;     /* formula box, light highlights */
  --yellow:#FFC627;        /* hi-vis: buttons, result number, logo */
  --yellow-hover:#FFB800;
  --yellow-tint:#FFF4CC;   /* result box on light backgrounds */
  --yellow-ink:#3D2D00;    /* body text on yellow */
  --navy:#0B1A3A;          /* footer, result panel */
  --navy-line:#22335C;     /* dividers on navy */
  --navy-muted:#C7D2EA;    /* secondary text on navy */

  /* Neutrals */
  --ink:#111827;           /* headings, body */
  --text:#1F2937;
  --text-2:#374151;
  --muted:#4B5563;         /* secondary text on white (7:1) */
  --muted-2:#5B6472;       /* labels, units (5.6:1 on white) */
  --line:#DCE2EC;          /* borders */
  --line-2:#EEF1F6;        /* row dividers */
  --input-line:#C9D2E0;
  --surface:#F4F6FA;       /* category bar, bands, table heads */
  --bg:#FFFFFF;

  /* Type */
  --font-head:'Archivo',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-body:'Public Sans',system-ui,-apple-system,'Segoe UI',sans-serif;

  /* Shape */
  --r-sm:4px; --r:8px; --r-md:10px; --r-lg:12px;
  --focus:0 0 0 3px rgba(24,73,214,.18);
  --wrap:1200px;
}

/* ---------- 2. Base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-dark);text-decoration:underline}
h1,h2,h3,.h{font-family:var(--font-head);letter-spacing:-0.01em;color:var(--ink)}
h1{font-size:clamp(32px,4vw,46px);font-weight:800;line-height:1.08;margin:0}
h2{font-size:clamp(26px,3vw,32px);font-weight:800;line-height:1.15;margin:0}
h3{font-size:19px;font-weight:700;margin:0}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px;width:100%;box-sizing:border-box}
@media (max-width:480px){.wrap{padding:0 14px}}
html,body{overflow-x:clip;max-width:100%}
@media (max-width:480px){.wrap{padding:0 16px}}
.num{font-variant-numeric:tabular-nums}

/* ---------- 3. Header ---------- */
.site-header{position:relative;background:var(--bg);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:68px;flex-wrap:wrap}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink)}
.logo:hover{text-decoration:none;color:var(--ink)}
.logo-mark{width:34px;height:34px;border-radius:7px;background:var(--yellow);display:flex;align-items:center;justify-content:center;flex:none}
.logo-word{font-family:var(--font-head);font-size:22px;font-weight:800}
.menu-btn{display:none}
.main-nav{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.main-nav a{color:var(--ink);font-weight:600;font-size:15px;padding:10px 4px}
.main-nav a:hover{color:var(--blue);text-decoration:none}
.header-search{flex:1 1 260px;max-width:420px}
.search-box{display:flex;align-items:center;gap:10px;border:1.5px solid var(--input-line);border-radius:var(--r);padding:0 12px;min-height:44px;background:#fff}
.search-box:focus-within{border-color:var(--blue);box-shadow:var(--focus)}
.search-box input{border:0;outline:0;width:100%;font:500 15px var(--font-body);background:transparent;color:var(--ink)}
@media (max-width:760px){
  .menu-btn{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 14px;border:1.5px solid var(--input-line);border-radius:var(--r);background:#fff;font:600 15px var(--font-body);color:var(--ink);cursor:pointer}
  .main-nav{display:none;position:absolute;left:0;right:0;top:100%;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 8px 16px rgba(17,24,39,.08);flex-direction:column;align-items:stretch;gap:0;padding:8px 16px 16px}
  .main-nav.open{display:flex}
  .main-nav a{padding:14px 4px;border-bottom:1px solid var(--line-2)}
  .main-nav .units{margin-top:12px;align-self:flex-start}
  .header-search{order:3;flex-basis:100%;max-width:none;padding-bottom:12px}
}

/* Units segmented control (used in header on homepage and in calculators) */
.units{display:inline-flex;border:1.5px solid var(--input-line);border-radius:var(--r);overflow:hidden}
.units button{border:0;background:#fff;color:var(--ink);font:600 15px var(--font-body);padding:0 16px;min-height:44px;cursor:pointer}
.units button[aria-pressed="true"]{background:var(--ink);color:#fff;font-weight:700}
.units-label{font-size:13px;font-weight:600;color:var(--muted-2)} /* UK-only pages: "UK calculator · metric" */

/* ---------- 4. Category bar ---------- */
.cat-bar{background:var(--surface);border-bottom:1px solid var(--line)}
.cat-bar .wrap{display:flex;gap:26px;overflow-x:auto;scrollbar-width:thin}
.cat-bar a{color:var(--text);font-weight:600;font-size:14px;white-space:nowrap;padding:12px 2px;border-bottom:3px solid transparent}
.cat-bar a:hover,.cat-bar a[aria-current="page"]{color:var(--blue);border-bottom-color:var(--yellow);text-decoration:none}
.cat-bar a span{color:var(--muted-2);font-weight:500;margin-left:6px}

/* ---------- 5. Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:700 16px var(--font-body);border-radius:var(--r);padding:0 22px;min-height:48px;cursor:pointer;border:0;text-decoration:none}
.btn:hover{text-decoration:none}
.btn-yellow{background:var(--yellow);color:var(--ink);min-height:52px}
.btn-yellow:hover{background:var(--yellow-hover);color:var(--ink)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000;color:#fff}
.btn-outline{background:transparent;color:var(--ink);border:2px solid var(--ink)}
.btn-outline:hover{background:var(--ink);color:#fff}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid #4A5E8C;min-height:44px;font-size:15px;padding:0 16px}
.btn-ghost:hover{background:#16285A;color:#fff}

/* ---------- 6. Hero (homepage) ---------- */
.hero{background:var(--blue);color:#fff}
.hero .wrap{display:flex;flex-wrap:wrap;gap:48px;align-items:center;padding-top:64px;padding-bottom:72px}
.hero-copy{flex:1 1 460px;min-width:0;display:flex;flex-direction:column;gap:22px}
.hero h1{color:#fff;font-size:clamp(36px,5vw,58px);line-height:1.04}
.hero-lede{margin:0;font-size:19px;line-height:1.55;color:#E3EAFF;max-width:560px}
.hero-search label{display:block;font-size:14px;font-weight:600;color:#E3EAFF;margin-bottom:8px}
.hero-search .row{display:flex;gap:8px;flex-wrap:wrap;max-width:580px}
.hero-search .search-box{flex:1 1 280px;border:0;min-height:52px;padding:0 14px}
.hero-search .search-box input{font-size:17px}
.hero-popular{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:15px;color:#E3EAFF}
.hero-popular a{color:#fff;text-decoration:underline;text-underline-offset:3px}
.mini-calc{flex:1 1 380px;min-width:0;max-width:480px;background:#fff;color:var(--ink);border-radius:var(--r-lg);box-shadow:0 18px 40px rgba(6,22,74,.35);overflow:hidden}
.mini-calc-head{display:flex;justify-content:space-between;align-items:center;padding:16px 22px;border-bottom:1px solid var(--line-2)}
.mini-calc-head .tag-try{font-size:12px;font-weight:700;background:var(--yellow-tint);color:#6B4E00;padding:4px 8px;border-radius:var(--r-sm)}
.mini-calc-fields{padding:20px 22px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.mini-result{margin:0 22px;background:var(--yellow-tint);border-radius:var(--r-md);padding:18px 20px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;align-items:flex-end}
.mini-result .big{font-family:var(--font-head);font-size:38px;font-weight:800;line-height:1}
@media (max-width:420px){.mini-calc-fields{grid-template-columns:1fr}}

/* ---------- 7. Form fields ---------- */
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field label{font-size:14px;font-weight:600;color:var(--text-2)}
.input{display:flex;align-items:center;gap:8px;border:1.5px solid var(--input-line);border-radius:var(--r);background:#fff;height:50px;padding:0 14px}
.input:focus-within{border-color:var(--blue);box-shadow:var(--focus)}
.input input,.input select{border:0;outline:0;width:100%;min-width:0;font:600 18px var(--font-body);color:var(--ink);background:transparent;font-variant-numeric:tabular-nums}
.input .unit{color:var(--muted-2);font-size:15px;font-weight:500;white-space:nowrap}
.fields-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:16px}

/* ---------- 8. Trust row / bands ---------- */
.trust{border-bottom:1px solid var(--line)}
.trust .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:28px;padding-top:36px;padding-bottom:36px}
.trust-item{display:flex;gap:14px}
.trust-item svg{flex:none;color:var(--blue)}
.trust-item b{display:block;font-size:16px}
.trust-item p{margin:4px 0 0;font-size:15px;color:var(--muted);line-height:1.5}
.band{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.method-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px}
.method{border-top:4px solid var(--blue);padding-top:18px}
.method h3{font-size:20px;margin-bottom:8px}
.method p{margin:0;font-size:16px;line-height:1.6;color:var(--text-2)}
.pro-band{background:var(--yellow)}
.pro-band .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;padding-top:36px;padding-bottom:36px}
.pro-band h2{font-size:28px}
.pro-band p{margin:6px 0 0;color:var(--yellow-ink)}

/* ---------- 9. Section headings ---------- */
.section{padding-top:64px;padding-bottom:64px}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.section-head p{margin:8px 0 0;color:var(--muted)}
.section-head a{font-weight:700}

/* ---------- 10. Quick-start cards ---------- */
.qgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.qcard{display:flex;flex-direction:column;gap:8px;padding:20px;border:1px solid var(--line);border-radius:var(--r-md);background:#fff;color:var(--ink);min-height:132px}
.qcard:hover{border-color:var(--blue);box-shadow:0 2px 0 var(--blue);text-decoration:none;color:var(--ink)}
.qcard .kicker{font-size:13px;font-weight:700;color:var(--blue);text-transform:uppercase}
.qcard .title{font-family:var(--font-head);font-size:20px;font-weight:700}
.qcard .desc{font-size:15px;color:var(--muted);line-height:1.45}

/* ---------- 11. Directory (all calculators) ---------- */
.dir-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px;align-items:start}
.dir-block{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:20px 20px 8px;scroll-margin-top:16px}
.dir-block-head{display:flex;align-items:center;gap:10px;margin-bottom:12px;color:var(--blue)}
.dir-block-head h3{color:var(--ink)}
.dir-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 0;border-top:1px solid var(--line-2);font-size:15px}
.dir-row a{color:var(--ink);font-weight:500}
.dir-row a:hover{color:var(--blue)}
.dir-row .chev{color:var(--blue);font-weight:700}
.dir-row .soon{color:var(--muted-2)}
.tag{font-size:12px;font-weight:600;color:var(--muted-2);background:var(--line-2);border-radius:var(--r-sm);padding:2px 7px;white-space:nowrap}
.dir-row[hidden]{display:none}

/* ---------- 12. FAQ ---------- */
.faq-wrap{display:flex;flex-wrap:wrap;gap:48px}
.faq-intro{flex:1 1 280px;min-width:0}
.faq-list{flex:2 1 520px;min-width:0}
details.faq{border-top:1px solid var(--line);padding:18px 0}
details.faq:last-child{border-bottom:1px solid var(--line)}
details.faq summary{cursor:pointer;font-weight:700;font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:16px}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:'+';color:var(--blue);font-size:22px;line-height:1}
details.faq[open] summary::after{content:'\2212'}
details.faq p{margin:12px 0 0;font-size:16px;line-height:1.6;color:var(--text-2)}

/* ---------- 13. Calculator page ---------- */
.breadcrumb{font-size:14px;color:var(--muted-2);display:flex;gap:8px;flex-wrap:wrap}
.page-title{padding-top:28px;padding-bottom:8px}
.page-title h1{margin:14px 0 10px}
.page-title .lede{margin:0;font-size:18px;line-height:1.6;color:var(--text-2);max-width:760px}
.page-title .meta{margin:10px 0 0;font-size:14px;color:var(--muted-2)}
.calc{display:flex;flex-wrap:wrap;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;width:100%;max-width:100%;box-sizing:border-box}
.calc > *{min-width:0}
.calc > :not(.calc-inputs):not(.calc-result){flex:1 1 100%}
[hidden]{display:none!important}
.calc-inputs{flex:3 1 520px;min-width:0;padding:28px;display:flex;flex-direction:column;gap:22px}
.calc-inputs-head{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.calc-inputs-head h2{font-size:20px;font-weight:700}
.calc-tabs,.mode-tabs{display:flex;gap:6px;flex-wrap:wrap;border-bottom:1px solid var(--line);width:100%;position:relative;z-index:2}
.calc-tabs button,.mode-tabs button{border:0;background:none;font:600 15px var(--font-body);color:var(--text-2);padding:12px 14px;border-bottom:3px solid transparent;cursor:pointer}
.calc-tabs button[aria-selected="true"],.mode-tabs button[aria-selected="true"],.calc-tabs button.is-active,.mode-tabs button.is-active{color:var(--blue);border-bottom-color:var(--yellow)}
.fields-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;width:100%;min-width:0}
.fields-grid .field,.calc-inputs .field{display:flex;flex-direction:column;gap:6px;min-width:0}
.fields-grid .full,.field.full{grid-column:1/-1}
.field.field-check,.calc-inputs .field:has(> label input[type=checkbox]){flex-direction:row;align-items:center;gap:10px}
.field.field-check label,.calc-inputs .field:has(> label input[type=checkbox]) > label{display:flex;align-items:center;gap:10px;font-weight:500;margin:0}
.field-section{display:flex;flex-direction:column;gap:12px;width:100%}
.field-section + .field-section{margin-top:8px;padding-top:20px;border-top:1px solid var(--line-2)}
.field-section-title{font:700 15px var(--font-body);color:var(--ink);margin:0}
.field-section > .field-section{margin:0;padding:0;border:0}
.calc-inputs #wall-linear-wrap,
.calc-inputs #wall-per-wrap,
.calc-inputs #ceiling-fields,
.calc-inputs #patch-size-wrap,
.calc-inputs [id$="-wrap"]:not(.field):not(.input){
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;width:100%
}
.calc-inputs #wall-per-wrap .field.full,
.calc-inputs [id$="-wrap"] .field.full{grid-column:1/-1}
.calc-note{margin:0;font-size:14px;line-height:1.6;color:var(--muted-2)}
.calc-result{flex:2 1 340px;min-width:0;background:var(--navy);color:#fff;padding:28px;display:flex;flex-direction:column;gap:18px}
.calc-result .label{font-size:14px;font-weight:700;color:var(--navy-muted);letter-spacing:.04em;text-transform:uppercase}
.calc-result .big{font-family:var(--font-head);font-size:clamp(38px,4vw,52px);font-weight:800;line-height:1;color:var(--yellow)}
.calc-result .big-note{font-size:15px;color:var(--navy-muted);margin-top:8px}
.calc-result .empty{color:var(--navy-muted)}
.res-row{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-top:1px solid var(--navy-line);font-size:16px}
.res-row:last-child{border-bottom:1px solid var(--navy-line)}
.res-row span:first-child{color:var(--navy-muted)}
.res-row span:last-child{font-weight:700;text-align:right}
.calc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto}
.ad-slot{min-height:120px;border:1px dashed var(--input-line);border-radius:var(--r);display:flex;align-items:center;justify-content:center;color:var(--muted-2);font-size:13px;background:#FAFBFD}
.content{display:flex;flex-wrap:wrap;gap:56px;padding-top:24px;padding-bottom:64px}
.prose{flex:999 1 560px;min-width:0}
.prose h2{font-size:28px;margin:44px 0 12px;scroll-margin-top:16px}
.prose h2:first-child{margin-top:12px}
.prose h3{font-size:21px;margin:28px 0 8px}
.prose p,.prose li{font-size:17px;line-height:1.7;color:var(--text)}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{padding-left:22px;margin:0 0 16px}
.formula{background:var(--blue-tint);border-radius:var(--r-md);padding:20px 22px;margin:0 0 20px}
.formula .k{font-size:13px;font-weight:700;color:var(--blue);margin-bottom:8px;text-transform:uppercase}
.formula .f{font-family:var(--font-head);font-size:22px;font-weight:700;line-height:1.4}
.table-wrap{overflow-x:auto;margin:0 0 20px}
.prose table{border-collapse:collapse;width:100%;font-size:16px}
.prose th{text-align:left;background:var(--surface);font-weight:700;padding:12px 14px;border-bottom:2px solid var(--line)}
.prose td{padding:12px 14px;border-bottom:1px solid var(--line-2);vertical-align:top}
.callout{background:var(--yellow-tint);border-radius:var(--r-md);padding:16px 18px;color:var(--yellow-ink)}
.sidebar{flex:1 1 260px;min-width:0;display:flex;flex-direction:column;gap:32px}
.side-label{font-size:13px;font-weight:700;color:var(--muted-2);margin-bottom:8px;letter-spacing:.04em;text-transform:uppercase}
.toc a{display:block;color:var(--text-2);font-size:15px;padding:7px 0 7px 12px;border-left:2px solid var(--line)}
.toc a:hover{color:var(--blue);border-left-color:var(--blue);text-decoration:none}
.rel{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-top:1px solid var(--line-2);color:var(--ink);font-weight:500;font-size:15px}
.rel:hover{color:var(--blue);text-decoration:none}
.rel::after{content:'\203A';color:var(--blue);font-weight:700}
.cta-box{background:var(--yellow);border-radius:var(--r-md);padding:20px}
.cta-box h3{font-size:19px;font-weight:800}
.cta-box p{margin:6px 0 14px;font-size:15px;line-height:1.5;color:var(--yellow-ink)}
.cta-box .btn{width:100%;margin-bottom:8px;min-height:46px}

/* ---------- 14. Footer ---------- */
.site-footer{background:var(--navy);color:#fff}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px;padding-top:56px;padding-bottom:40px}
.footer-col{display:flex;flex-direction:column;gap:10px}
.footer-col b{font-size:14px}
.site-footer a{color:var(--navy-muted);font-size:14px}
.site-footer a:hover{color:#fff}
.site-footer p{margin:0;font-size:14px;line-height:1.6;color:var(--navy-muted)}
.footer-bottom{border-top:1px solid var(--navy-line);padding-top:20px;padding-bottom:28px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:13px;color:var(--navy-muted)}

/* ---------- 15. Info pages (About, Contact, legal) ---------- */
.info{max-width:760px;padding-top:40px;padding-bottom:72px}
.info h1{margin-bottom:16px}

/* ---------- 15b. Legacy calculator helpers (migrated pages) ---------- */
.calc-inputs .input{display:flex;align-items:center;gap:8px;border:1px solid var(--input-line);border-radius:var(--r);background:#fff;padding:0 12px;min-height:48px;min-width:0;width:100%;box-sizing:border-box}
.calc-inputs .input input,.calc-inputs .input select,.calc-inputs .input textarea{border:0;background:transparent;width:100%;font:500 16px var(--font-body);padding:10px 0;outline:none;min-width:0}
.calc-inputs .unit,.calc-inputs .dim-unit{color:var(--muted-2);font-size:14px;font-weight:600;white-space:nowrap;flex:0 1 auto;max-width:40%;overflow:hidden;text-overflow:ellipsis}
@media (max-width:480px){
  .calc-inputs .unit,.calc-inputs .dim-unit{max-width:30%;font-size:12px}
  .fields-grid{grid-template-columns:1fr}
}
.calc-inputs select.dim-unit{width:auto;flex:0 0 auto;max-width:7rem;color:var(--muted-2)}
.calc-diagram-large,.calc-diagram{margin-bottom:8px;width:100%;max-width:100%;overflow:hidden}
.calc-diagram-large svg,.diagram-panel-large{width:100%;max-width:420px;height:auto;display:block}
.units-label{font-size:14px;font-weight:700;color:var(--muted-2);background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:8px 12px}
.calc-result .result-grid{display:flex;flex-direction:column;gap:0}
.calc-result .result-item{padding:12px 0;border-top:1px solid var(--navy-line)}
.calc-result .result-item .label{font-size:13px;color:var(--navy-muted);margin-bottom:6px;text-transform:none;letter-spacing:0}
.calc-result .result-item .value{font-weight:700;font-size:16px}
.calc-result .bags-table{width:100%;border-collapse:collapse;font-size:14px}
.calc-result .bags-table th,.calc-result .bags-table td{padding:4px 0;text-align:left;color:#fff}
.calc-result .bags-table th{color:var(--navy-muted);font-weight:600}
.field-hint,.preset-row,.field-help{margin:2px 0 0;font-size:14px;line-height:1.5;color:var(--muted-2)}
.field-label{display:block;font:600 15px var(--font-body);color:var(--ink);margin:0 0 6px}
/* Repeatable rows (rooms, areas, walls, sections) */
.repeat,.extra-area-list{display:flex;flex-direction:column;gap:10px;width:100%;min-width:0}
.repeat-row,.extra-area-row,.room-row,.wall-row,.area-row,.section-row{display:grid;grid-template-columns:auto minmax(0,1fr) auto minmax(0,1fr) auto;align-items:center;gap:10px;width:100%;min-width:0;position:relative;z-index:0}
.repeat-name,.room-label{font-weight:600;font-size:14px;color:var(--text-2);min-width:60px}
.repeat-x,.times{color:var(--muted-2);font-weight:600}
.btn-add,.calc-inputs .btn-add{align-self:flex-start;display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 16px;border:1.5px dashed var(--input-line);border-radius:var(--r);background:#fff;color:var(--blue);font:700 15px var(--font-body);cursor:pointer}
.btn-add:hover{border-color:var(--blue);background:var(--blue-tint)}
.btn-remove{min-height:44px;padding:0 8px;border:0;background:none;color:var(--muted-2);font:600 14px var(--font-body);text-decoration:underline;cursor:pointer}
.btn-remove:hover{color:#B42318}
.repeat-row:only-child .btn-remove,.extra-area-list > :only-child .btn-remove{visibility:hidden}
@media (max-width:560px){
  .repeat-row,.extra-area-row,.room-row,.wall-row,.area-row,.section-row{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .repeat-name,.room-label{grid-column:1/-1}
  .repeat-x,.times{display:none}
  .btn-remove{grid-column:1/-1;justify-self:start;min-height:36px}
}
.check{display:flex;align-items:flex-start;gap:10px;min-height:44px;font-size:15px;color:var(--text);cursor:pointer}
.check input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--blue);flex:none}
.options{display:flex;flex-wrap:wrap;gap:8px}
.options button,.options label{min-height:44px;padding:0 14px;border:1.5px solid var(--input-line);border-radius:var(--r);background:#fff;font:600 15px var(--font-body);color:var(--ink);display:inline-flex;align-items:center;cursor:pointer}
.options [aria-pressed="true"],.options button.is-active,.options input:checked + span{border-color:var(--ink);background:var(--ink);color:#fff}
.field:has(> .repeat),.field:has(> .btn-add),.field:has(> .options){display:flex;flex-direction:column;gap:10px;align-items:stretch}
.calc-inputs details{width:100%;min-width:0}
.calc-inputs details .field{width:100%}
.calc-inputs #wall-list,.calc-inputs #gable-list,.calc-inputs .repeat{width:100%;min-width:0}
.field input[type=range]{width:100%;accent-color:var(--blue)}
.res-table{width:100%;border-collapse:collapse;font-size:15px}
.res-table th,.res-table td{padding:8px 0;border-top:1px solid var(--navy-line);text-align:left}
.res-table td:last-child,.res-table th:last-child{text-align:right;font-weight:700}
.input > * + input,.input > * + select{flex:1}
.calc-inputs .module-panel{display:none}
.calc-inputs .module-panel.is-active{display:block}
.shape-selector{width:100%;max-width:100%;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-bottom:8px;box-sizing:border-box}
@media (min-width:480px){.shape-selector{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (min-width:768px){.shape-selector{grid-template-columns:repeat(5,minmax(0,1fr))}}
.shape-card{position:relative;display:flex;flex-direction:column;align-items:center;gap:6px;padding:10px 6px;border:2px solid var(--line);border-radius:var(--r);background:var(--surface);cursor:pointer;min-width:0}
.shape-card.is-active{border-color:var(--yellow);background:var(--yellow-tint)}
.shape-card-icon{width:64px;height:64px;max-width:100%}
.shape-card-label{font-size:12px;font-weight:600;text-align:center;line-height:1.25}
.shape-card-check{display:none}
.shape-card.is-active .shape-card-check{display:flex;position:absolute;top:4px;right:4px;width:18px;height:18px;align-items:center;justify-content:center;background:var(--yellow);border-radius:50%;font-size:11px;font-weight:800}

/* ---------- 16. Blog ---------- */
.blog-hub{padding-top:28px;padding-bottom:72px}
.blog-hub .lede{margin:0 0 20px;font-size:18px;line-height:1.6;color:var(--text-2);max-width:760px}
.blog-filters{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 28px}
.blog-filters button{min-height:40px;padding:0 14px;border:1.5px solid var(--input-line);border-radius:var(--r);background:#fff;font:600 14px var(--font-body);color:var(--ink);cursor:pointer}
.blog-filters button:hover{border-color:var(--blue);color:var(--blue)}
.blog-filters button[aria-pressed="true"]{border-color:var(--ink);background:var(--ink);color:#fff}
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.blog-card{display:flex;flex-direction:column;gap:8px;padding:20px;border:1px solid var(--line);border-radius:var(--r-md);background:#fff;color:var(--ink);min-height:160px}
.blog-card:hover{border-color:var(--blue);box-shadow:0 2px 0 var(--blue);text-decoration:none;color:var(--ink)}
.blog-card .kicker{font-size:13px;font-weight:700;color:var(--blue);text-transform:uppercase}
.blog-card .title{font-family:var(--font-head);font-size:20px;font-weight:700;line-height:1.3}
.blog-card .desc{font-size:15px;color:var(--muted);line-height:1.45;flex:1}
.blog-card .meta{font-size:13px;color:var(--muted-2);display:flex;flex-wrap:wrap;gap:8px}
.blog-empty{grid-column:1/-1;padding:28px;border:1px dashed var(--input-line);border-radius:var(--r-md);color:var(--muted-2);text-align:center}
.blog-post-meta{margin:8px 0 20px;font-size:14px;color:var(--muted-2)}
.blog-calc-box{background:var(--blue-tint);border-radius:var(--r-md);padding:20px 22px;margin:0 0 24px}
.blog-calc-box p{margin:0 0 14px;font-size:16px;line-height:1.5;color:var(--text)}
.blog-calc-box .btn{min-height:46px}
.example{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);padding:18px 20px;margin:0 0 20px}
.example .answer{margin:12px 0 0;font-weight:700}
ol.steps{padding-left:22px;margin:0 0 16px}
ol.steps li{margin:0 0 10px}
ul.terms{padding-left:22px;margin:0 0 16px}
.blog-sources{font-size:15px;line-height:1.6}
.blog-sources li{margin:0 0 8px}

/* ---------- 17. Print ---------- */
@media print{
  .site-header,.cat-bar,.ad-slot,.sidebar,.site-footer,.calc-actions,.pro-band{display:none!important}
  .calc-result{background:#fff;color:#000;border-top:2px solid #000}
  .calc-result .big{color:#000}
  .res-row span:first-child,.calc-result .label,.calc-result .big-note{color:#333}
}