/* Self-hosted fonts (woff2, latin) — replaces Google Fonts CDN. */
@font-face{font-family:'Archivo';font-style:normal;font-weight:500;font-display:swap;src:url('/assets/fonts/archivo-latin-500-normal.woff2') format('woff2')}
@font-face{font-family:'Archivo';font-style:normal;font-weight:600;font-display:swap;src:url('/assets/fonts/archivo-latin-600-normal.woff2') format('woff2')}
@font-face{font-family:'Archivo';font-style:normal;font-weight:700;font-display:swap;src:url('/assets/fonts/archivo-latin-700-normal.woff2') format('woff2')}
@font-face{font-family:'Archivo';font-style:normal;font-weight:800;font-display:swap;src:url('/assets/fonts/archivo-latin-800-normal.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:400;font-display:swap;src:url('/assets/fonts/inter-latin-400-normal.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:500;font-display:swap;src:url('/assets/fonts/inter-latin-500-normal.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:600;font-display:swap;src:url('/assets/fonts/inter-latin-600-normal.woff2') format('woff2')}
@font-face{font-family:'JetBrains Mono';font-style:normal;font-weight:400;font-display:swap;src:url('/assets/fonts/jetbrains-mono-latin-400-normal.woff2') format('woff2')}
@font-face{font-family:'JetBrains Mono';font-style:normal;font-weight:500;font-display:swap;src:url('/assets/fonts/jetbrains-mono-latin-500-normal.woff2') format('woff2')}
@font-face{font-family:'JetBrains Mono';font-style:normal;font-weight:600;font-display:swap;src:url('/assets/fonts/jetbrains-mono-latin-600-normal.woff2') format('woff2')}
/* concretematerialcalc.com — main stylesheet
   Palette: slate-ink, rebar-steel, wet-concrete, safety-amber, mix-line.
   Type: Archivo (display) / Inter (body) / JetBrains Mono (data). Self-host at launch. */

:root{
  --ink:#1C2127; --steel:#3A4654; --steel-soft:#5A6675;
  --concrete:#E8E6E1; --concrete-2:#F2F0EC; --grey:#C9C5BC;
  --line:#D7D3CA; --amber:#E8893A; --mix:#D14F2A;
  --cement:#9AA3AE; --sand:#D9A441; --agg:#6B7480;
  --white:#FBFAF8; --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;font-size:16.5px;background:var(--concrete);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
img{max-width:100%}

/* ---- Header ---- */
header.bar{position:sticky;top:0;z-index:50;background:rgba(28,33,39,0.97);backdrop-filter:saturate(140%) blur(6px);color:var(--white);border-bottom:1px solid #2A313A}
.bar-inner{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{display:flex;align-items:center;gap:10px;font-family:'Archivo';font-weight:800;letter-spacing:-0.02em;font-size:18px}
.logo .mark{width:26px;height:26px;border-radius:5px;background:linear-gradient(135deg,var(--amber),var(--mix));display:grid;place-items:center;color:#fff;font-size:13px;font-weight:800}
.logo .tld{color:var(--grey);font-weight:600}
nav.top{display:flex;gap:26px;align-items:center}
nav.top a{font-size:14px;color:#EDEBE6;font-weight:500;transition:color .15s}
nav.top a:hover{color:var(--white)}
nav.top a.cta{background:var(--amber);color:var(--ink);padding:8px 15px;border-radius:7px;font-weight:600}
nav.top a.cta:hover{background:#f0a25c}
.burger{display:none;background:none;border:0;color:var(--white);font-size:22px;cursor:pointer}
@media(max-width:820px){nav.top{display:none}.burger{display:block}nav.top.open{display:flex;flex-direction:column;position:absolute;top:62px;left:0;right:0;background:var(--ink);padding:18px 24px;gap:16px;border-bottom:1px solid #2A313A}}

/* ---- Hero ---- */
.hero{background:radial-gradient(900px 400px at 85% -10%, rgba(232,137,58,0.10), transparent 60%),var(--concrete);padding:54px 0 30px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:start}
@media(max-width:920px){.hero-grid{grid-template-columns:1fr;gap:34px}}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:'JetBrains Mono';font-size:12px;font-weight:500;text-transform:uppercase;letter-spacing:0.12em;color:var(--steel);background:var(--white);border:1px solid var(--line);padding:6px 12px;border-radius:100px;margin-bottom:20px}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--amber)}
h1{font-family:'Archivo';font-weight:800;letter-spacing:-0.025em;font-size:clamp(32px,5vw,50px);line-height:1.03;color:var(--ink)}
h1 .accent{color:var(--mix)}
.lede{font-size:17px;color:var(--steel);margin-top:18px;max-width:30em}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.chip{font-family:'JetBrains Mono';font-size:12.5px;font-weight:500;background:var(--white);border:1px solid var(--line);color:var(--steel);padding:6px 11px;border-radius:6px}
.chip b{color:var(--ink);font-weight:600}

/* ---- Calculator card ---- */
.calc{background:var(--white);border:1px solid var(--line);border-radius:14px;box-shadow:0 1px 0 #fff inset,0 18px 40px -24px rgba(28,33,39,0.4);overflow:hidden}
.calc-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--ink);color:var(--white)}
.calc-head .t{font-family:'Archivo';font-weight:700;font-size:15px}
.calc-head .live{font-family:'JetBrains Mono';font-size:11px;color:var(--amber);display:flex;align-items:center;gap:6px}
.calc-head .live::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--amber);animation:pulse 1.8s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.calc-body{padding:22px 20px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:430px){.field-row{grid-template-columns:1fr}}
.field{margin-bottom:15px}
.field label{display:block;font-size:12px;font-weight:600;color:var(--steel);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:6px}
.field input,.field select{width:100%;padding:11px 12px;font-size:15px;font-family:'JetBrains Mono';border:1px solid var(--line);border-radius:8px;background:var(--concrete-2);color:var(--ink);transition:border-color .15s,box-shadow .15s}
.field input:focus,.field select:focus{outline:none;border-color:var(--amber);box-shadow:0 0 0 3px rgba(232,137,58,0.18);background:#fff}
#customWrap{display:none;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-bottom:15px}
.unit-toggle{display:flex;gap:6px;margin-bottom:18px}
.unit-toggle button{flex:1;padding:8px;font-family:'JetBrains Mono';font-size:13px;font-weight:500;border:1px solid var(--line);background:var(--concrete-2);color:var(--steel-soft);border-radius:7px;cursor:pointer;transition:all .15s}
.unit-toggle button.active{background:var(--ink);color:var(--white);border-color:var(--ink)}
.mixbar-wrap{margin:4px 0 18px}
.mixbar-label{display:flex;justify-content:space-between;font-family:'JetBrains Mono';font-size:11px;color:var(--steel-soft);margin-bottom:7px}
.mixbar{height:38px;border-radius:8px;overflow:hidden;display:flex;border:1px solid var(--line);background:var(--concrete-2);font-family:'JetBrains Mono';font-size:11px;font-weight:600}
.mixbar .seg{display:flex;align-items:center;justify-content:center;color:#fff;transition:flex-basis .4s cubic-bezier(.2,.7,.2,1);white-space:nowrap;overflow:hidden}
.seg.cement{background:var(--cement)}.seg.sand{background:var(--sand)}.seg.agg{background:var(--agg)}
.results{border-top:1px dashed var(--line);margin-top:4px;padding-top:18px}
.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.res{background:var(--concrete-2);border:1px solid var(--line);border-radius:9px;padding:12px 13px}
.res .k{font-size:11px;text-transform:uppercase;letter-spacing:0.05em;color:var(--steel-soft);font-weight:600}
.res .v{font-family:'JetBrains Mono';font-weight:600;font-size:20px;color:var(--ink);margin-top:3px;line-height:1.1}
.res .v small{font-size:12px;color:var(--steel-soft);font-weight:500}
.res .sub{font-family:'JetBrains Mono';font-size:11px;color:var(--steel-soft);margin-top:4px}
.res.hero-res{background:var(--ink);border-color:var(--ink)}
.res.hero-res .k{color:var(--grey)}.res.hero-res .v{color:var(--amber)}
.calc-foot{margin-top:16px;padding-top:15px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.calc-foot .note{font-size:12px;color:var(--steel-soft);font-family:'JetBrains Mono'}
.btn-boq{background:var(--mix);color:#fff;font-weight:600;font-size:14px;padding:10px 16px;border-radius:8px;border:0;cursor:pointer;display:inline-flex;align-items:center;gap:8px;transition:background .15s}
.btn-boq:hover{background:#b8431f}

/* ---- Sections ---- */
section{padding:62px 0}
.sec-head{margin-bottom:34px;max-width:40em}
.sec-eyebrow{font-family:'JetBrains Mono';font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:0.12em;color:var(--mix);margin-bottom:10px}
.sec-head h2{font-family:'Archivo';font-weight:700;font-size:clamp(25px,3.4vw,33px);letter-spacing:-0.02em;line-height:1.1}
.sec-head p{color:var(--steel);margin-top:12px;font-size:16px}

/* trust strip */
.trust{background:var(--concrete-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:34px 0}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
@media(max-width:680px){.trust-grid{grid-template-columns:repeat(2,1fr);gap:20px}}
.trust-item .big{font-family:'Archivo';font-weight:800;font-size:30px;color:var(--ink);letter-spacing:-0.02em}
.trust-item .sm{font-size:13px;color:var(--steel-soft);margin-top:3px}

/* moat band */
.moat{background:var(--ink);color:var(--white);border-top:1px solid #2A313A;border-bottom:1px solid #2A313A}
.moat .sec-eyebrow{color:var(--amber)}
.moat .sec-head h2{color:var(--white)}
.moat .sec-head p{color:var(--grey)}
.moat-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center}
@media(max-width:820px){.moat-grid{grid-template-columns:1fr;gap:30px}}
.moat-feats{display:grid;gap:14px}
.moat-feat{display:flex;gap:14px;align-items:flex-start}
.moat-feat .n{font-family:'JetBrains Mono';font-size:13px;color:var(--amber);font-weight:600;padding-top:2px;min-width:24px}
.moat-feat .ft{font-family:'Archivo';font-weight:600;font-size:15px;color:var(--white)}
.moat-feat .fd{font-size:14px;color:var(--grey);margin-top:2px}
.moat-cta{display:inline-flex;align-items:center;gap:8px;background:var(--amber);color:var(--ink);font-weight:600;padding:11px 18px;border-radius:8px;margin-top:22px;font-size:14px;border:0;cursor:pointer}
.moat-visual{background:#161A1F;border:1px solid #2A313A;border-radius:12px;padding:20px;font-family:'JetBrains Mono';font-size:12.5px}
.boq-row{display:grid;grid-template-columns:1fr auto auto;gap:10px;padding:9px 0;border-bottom:1px solid #242A31;color:var(--grey)}
.boq-row.h{color:var(--steel-soft);font-size:11px;text-transform:uppercase;letter-spacing:0.05em}
.boq-row.tot{border-bottom:0;color:var(--white);font-weight:600;padding-top:13px}
.boq-row .amt{color:var(--amber)}

/* tool grid */
.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:820px){.tool-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.tool-grid{grid-template-columns:1fr}}
.tool{background:var(--white);border:1px solid var(--line);border-radius:11px;padding:20px;transition:transform .15s,box-shadow .15s,border-color .15s;display:block}
.tool:hover{transform:translateY(-3px);box-shadow:0 14px 30px -20px rgba(28,33,39,0.45);border-color:var(--grey)}
.tool .ic{width:38px;height:38px;border-radius:9px;background:var(--concrete);display:grid;place-items:center;font-size:19px;margin-bottom:13px;border:1px solid var(--line)}
.tool h3{font-family:'Archivo';font-weight:600;font-size:16px}
.tool p{font-size:14.5px;color:var(--steel);margin-top:5px;line-height:1.5}
.tool .tag{display:inline-block;margin-top:11px;font-family:'JetBrains Mono';font-size:10.5px;font-weight:500;text-transform:uppercase;letter-spacing:0.06em;color:var(--mix)}
.tool.feature{border-color:var(--amber);box-shadow:0 0 0 1px var(--amber)}
.tool.feature .ic{background:var(--amber);border-color:var(--amber)}
.tool.soon{opacity:.62}
.tool.soon .tag{color:var(--steel-soft)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
@media(max-width:760px){.steps{grid-template-columns:1fr}}
.step .num{font-family:'Archivo';font-weight:800;font-size:40px;color:var(--grey);line-height:1}
.step h4{font-family:'Archivo';font-weight:600;font-size:17px;margin:10px 0 6px}
.step p{font-size:14px;color:var(--steel)}

/* faq */
.faq-item{border-bottom:1px solid var(--line);padding:18px 0}
.faq-item summary{font-family:'Archivo';font-weight:600;font-size:16px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary .pm{color:var(--mix);font-size:20px;transition:transform .2s}
.faq-item[open] summary .pm{transform:rotate(45deg)}
.faq-item p{font-size:14.5px;color:var(--steel);margin-top:11px;max-width:56em}

/* ---- BOQ page ---- */
.boq-page{padding:40px 0 60px}
.boq-layout{display:grid;grid-template-columns:340px 1fr;gap:28px;align-items:start}
@media(max-width:900px){.boq-layout{grid-template-columns:1fr}}
.panel{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:20px}
.panel h3{font-family:'Archivo';font-weight:700;font-size:15px;margin-bottom:14px}
.bfield{margin-bottom:11px}
.bfield label{display:block;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:0.05em;color:var(--steel);margin-bottom:5px}
.bfield input,.bfield select{width:100%;padding:9px 10px;font-family:'JetBrains Mono';font-size:14px;border:1px solid var(--line);border-radius:7px;background:var(--concrete-2)}
.bfield input:focus,.bfield select:focus{outline:none;border-color:var(--amber);background:#fff}
#dimFields{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}
.btn-primary{width:100%;background:var(--mix);color:#fff;border:0;border-radius:8px;padding:11px;font-weight:600;font-size:14px;cursor:pointer;margin-top:4px}
.btn-primary:hover{background:#b8431f}
.btn-ghost{background:none;border:1px solid var(--line);color:var(--steel);border-radius:7px;padding:8px 12px;font-size:13px;cursor:pointer}
.btn-ghost:hover{border-color:var(--steel-soft)}
/* prominent PDF download button */
.btn-pdf{display:inline-flex;align-items:center;gap:8px;background:var(--ink);color:#fff;border:0;border-radius:8px;padding:11px 18px;font-size:14px;font-weight:600;cursor:pointer;font-family:'Inter',sans-serif;transition:background .15s}
.btn-pdf:hover{background:#2c333c}
.btn-pdf svg{width:16px;height:16px;flex:none}
.btn-pdf .lbl-sub{font-weight:400;opacity:.7;font-size:12px}
.rates{margin-top:18px;padding-top:18px;border-top:1px solid var(--line)}
.rates .bfield{margin-bottom:9px}
.boq-msg{color:var(--mix);font-size:12.5px;min-height:16px;margin-top:8px;font-family:'JetBrains Mono'}
.boq-table-wrap{background:var(--white);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.boq-table-head{display:flex;justify-content:space-between;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line)}
.boq-table-head h3{font-family:'Archivo';font-weight:700;font-size:15px}
table.boq{width:100%;border-collapse:collapse;font-size:14.5px}
table.boq th{text-align:left;font-size:10.5px;text-transform:uppercase;letter-spacing:0.05em;color:var(--steel-soft);font-weight:600;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--concrete-2)}
table.boq td{padding:12px 14px;border-bottom:1px solid var(--line);font-family:'JetBrains Mono';font-size:14px}
table.boq td .g{display:inline-block;margin-left:8px;font-size:10px;color:var(--mix);font-family:'JetBrains Mono'}
table.boq td.empty{text-align:center;color:var(--steel-soft);font-family:'Inter';padding:34px 14px}
table.boq .del{background:none;border:0;color:var(--steel-soft);cursor:pointer;font-size:14px}
table.boq .del:hover{color:var(--mix)}
.boq-totals{display:flex;flex-wrap:wrap;gap:18px;padding:16px 18px;background:var(--ink);color:var(--white)}
.boq-totals .tt{font-family:'JetBrains Mono'}
.boq-totals .tt .k{font-size:10.5px;text-transform:uppercase;letter-spacing:0.05em;color:var(--grey)}
.boq-totals .tt .v{font-size:18px;font-weight:600;color:var(--amber);margin-top:2px}

/* ---- generic content pages ---- */
.page-head{background:var(--ink);color:var(--white);padding:46px 0}
.page-head .crumb{font-family:'JetBrains Mono';font-size:12px;color:var(--grey);margin-bottom:10px}
.page-head h1{font-size:clamp(28px,4vw,40px);color:var(--white)}
.page-head p{color:var(--grey);margin-top:12px;max-width:46em}
article.prose{max-width:760px;margin:0 auto;padding:48px 0}
article.prose h2{font-family:'Archivo';font-weight:700;font-size:24px;margin:34px 0 12px;letter-spacing:-0.01em}
article.prose h3{font-family:'Archivo';font-weight:600;font-size:19px;margin:24px 0 8px}
article.prose p{font-size:16.5px;line-height:1.7;margin-bottom:14px;color:var(--steel)}
article.prose ul{margin:0 0 16px 20px;color:var(--steel)}
.page-head p{font-size:16.5px;line-height:1.6}
article.prose li{font-size:16.5px;line-height:1.65;margin-bottom:7px}
article.prose code{font-family:'JetBrains Mono';background:var(--concrete-2);border:1px solid var(--line);padding:1px 6px;border-radius:5px;font-size:14px}
article.prose table{width:100%;border-collapse:collapse;margin:16px 0;font-size:15px}
article.prose th,article.prose td{border:1px solid var(--line);padding:9px 12px;text-align:left}
article.prose th{background:var(--concrete-2);font-family:'Archivo';font-size:14px}
.callout{background:var(--concrete-2);border-left:3px solid var(--amber);border-radius:0 8px 8px 0;padding:14px 16px;margin:18px 0;font-size:14px;color:var(--steel)}

/* ---- standalone tool pages ---- */
.tool-layout{display:grid;grid-template-columns:340px 1fr;gap:28px;align-items:start}
@media(max-width:900px){.tool-layout{grid-template-columns:1fr}}
.tool-results{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:22px}
.tool-results h3{font-family:'Archivo';font-weight:700;font-size:15px;margin-bottom:14px}

/* ---- BBS page ---- */
.bbs-page{display:grid;grid-template-columns:360px 1fr;gap:28px;align-items:start}
@media(max-width:900px){.bbs-page{grid-template-columns:1fr}}
#bbsGrid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:6px 0 12px}

/* ---- wastage toggles + net-vs-recommended ---- */
.waste-toggles{display:flex;gap:5px;margin-top:7px}
.waste-toggles button{flex:1;padding:6px 4px;font-family:'JetBrains Mono';font-size:12px;border:1px solid var(--line);background:var(--concrete-2);color:var(--steel-soft);border-radius:6px;cursor:pointer;transition:all .14s}
.waste-toggles button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.order-line{font-family:'JetBrains Mono';font-size:11px;color:var(--grey);margin-top:5px;line-height:1.4}
.res.hero-res .order-line{color:rgba(255,255,255,0.65)}
.waste-note{font-size:11.5px;color:var(--steel-soft);margin-top:12px;line-height:1.5}
.safe-badge{display:inline-block;font-family:'JetBrains Mono';font-size:12px;font-weight:600;padding:5px 10px;border-radius:7px;margin-top:10px}
.safe-badge.ok{background:rgba(60,150,90,0.12);color:#2c7a4b;border:1px solid rgba(60,150,90,0.4)}
.safe-badge.warn{background:rgba(209,79,42,0.10);color:var(--mix);border:1px solid rgba(209,79,42,0.4)}

/* ---- glossary ---- */
.glossary-az-bar{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:30px;position:sticky;top:0;background:var(--paper);padding:10px 0;z-index:5}
.glossary-az{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:7px;background:var(--concrete-2);border:1px solid var(--line);color:var(--mix);font-family:'JetBrains Mono';font-size:13px;font-weight:600;text-decoration:none}
.glossary-az:hover{background:var(--mix);color:#fff}
.glossary-section{margin-bottom:36px}
.glossary-letter{font-family:'Archivo';font-weight:800;font-size:28px;color:var(--mix);border-bottom:2px solid var(--line);padding-bottom:6px;margin-bottom:16px}
.glossary-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.glossary-card{display:block;padding:16px 18px;border:1px solid var(--line);border-radius:11px;background:var(--white);text-decoration:none;transition:all .15s}
.glossary-card:hover{border-color:var(--mix);box-shadow:0 6px 20px -12px rgba(0,0,0,0.25);transform:translateY(-1px)}
.glossary-card h3{font-family:'Archivo';font-weight:700;font-size:17px;color:var(--ink);margin-bottom:5px}
.glossary-card p{font-size:14.5px;color:var(--steel);line-height:1.55}
.glossary-term p{font-size:16.5px;line-height:1.7;margin-bottom:14px}
.glossary-related{margin-top:28px;padding-top:20px;border-top:1px solid var(--line)}
.glossary-related h3{font-family:'Archivo';font-weight:700;font-size:15px;margin-bottom:12px}
.rel-links{display:flex;flex-wrap:wrap;gap:10px}
.rel-link{display:inline-flex;align-items:center;padding:8px 14px;border-radius:8px;background:rgba(209,79,42,0.07);border:1px solid rgba(209,79,42,0.25);color:var(--mix);font-size:14px;font-weight:500;text-decoration:none}
.rel-link:hover{background:var(--mix);color:#fff}

/* ---- stage guides ---- */
.stage-block{margin-bottom:42px}
.stage-block .sec-head{margin-bottom:18px}
.stage-tag{display:inline-block;font-family:'JetBrains Mono';font-size:12px;font-weight:600;color:var(--mix);background:rgba(209,79,42,0.08);border:1px solid rgba(209,79,42,0.3);padding:3px 10px;border-radius:6px;margin-top:6px}

/* ---- FAQ page (100 Qs, always visible) ---- */
.faq-jumpbar{display:flex;flex-wrap:wrap;gap:8px;padding:14px;background:var(--concrete-2);border:1px solid var(--line);border-radius:11px;position:sticky;top:0;z-index:5}
.faq-jump{font-size:13px;font-weight:600;color:var(--mix);text-decoration:none;padding:6px 12px;border-radius:7px;background:var(--white);border:1px solid var(--line)}
.faq-jump:hover{background:var(--mix);color:#fff}
.faq-cluster{padding:34px 0 8px;scroll-margin-top:70px}
.faq-cluster .sec-head{margin-bottom:18px}
.faq-list{display:flex;flex-direction:column;gap:14px;max-width:860px}
.faq-q{padding:18px 20px;border:1px solid var(--line);border-radius:11px;background:var(--white)}
.faq-q h3{font-family:'Archivo';font-weight:700;font-size:17px;color:var(--ink);margin-bottom:8px;line-height:1.4}
.faq-q p{font-size:15.5px;color:var(--steel);line-height:1.65}
.faq-q .formula-block,.faq-q code{font-family:'JetBrains Mono';font-size:13px}
.faq-link{display:inline-block;margin-top:10px;font-size:13px;font-weight:600;color:var(--mix);text-decoration:none;padding:5px 12px;border-radius:7px;background:rgba(209,79,42,0.07);border:1px solid rgba(209,79,42,0.25)}
.faq-link:hover{background:var(--mix);color:#fff}

/* ---- free tools directory ---- */
.ft-cat{margin-bottom:38px}
.ft-cat .sec-head{margin-bottom:16px}
.ft-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.ftool{display:block;padding:16px 18px;border:1px solid var(--line);border-radius:11px;background:var(--white);text-decoration:none;transition:all .15s}
.ftool:hover{border-color:var(--mix);box-shadow:0 6px 20px -12px rgba(0,0,0,0.25);transform:translateY(-1px)}
.ftool h3{font-family:'Archivo';font-weight:700;font-size:16px;color:var(--ink);margin-bottom:4px}
.ftool p{font-size:14.5px;color:var(--steel);line-height:1.55;margin-bottom:8px}
.ftool-url{font-family:'JetBrains Mono';font-size:14px;font-weight:500;color:#4da3ff;text-decoration:underline}
.ftool:hover .ftool-url{color:#4da3ff}

/* ---- optional raw material cost panel ---- */
.costbox{margin-top:14px;border:1px solid var(--line);border-radius:10px;background:var(--concrete-2);overflow:hidden}
.costbox summary{cursor:pointer;padding:12px 14px;font-family:'Archivo',sans-serif;font-weight:600;font-size:13.5px;color:var(--mix);list-style:none;display:flex;align-items:center;gap:8px}
.costbox summary::-webkit-details-marker{display:none}
.costbox summary::before{content:"\002B";font-family:'JetBrains Mono';font-weight:700;font-size:15px}
.costbox[open] summary::before{content:"\2212"}
.cost-inner{padding:0 14px 14px}
.cost-hint{font-size:12px;color:var(--steel-soft);line-height:1.5;margin-bottom:12px}
.cost-hint b{color:var(--ink)}
.cost-fields{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
@media(max-width:480px){.cost-fields{grid-template-columns:1fr}}
.cost-fields .bfield label{font-size:11px;color:var(--steel)}
.cost-summary{margin-top:14px;padding-top:14px;border-top:1px dashed var(--line)}
.cost-rows{display:flex;flex-direction:column;gap:6px;margin-bottom:10px}
.cost-rows .crow{display:flex;justify-content:space-between;font-family:'JetBrains Mono';font-size:12.5px;color:var(--steel)}
.cost-rows .crow b{color:var(--ink);font-weight:600}
.cost-total{display:flex;justify-content:space-between;align-items:center;background:var(--ink);color:#fff;border-radius:8px;padding:11px 13px;font-family:'Archivo';font-weight:600;font-size:14px}
.cost-total b{color:var(--amber);font-size:18px}
.cost-foot{font-size:11px;color:var(--steel-soft);margin-top:9px;line-height:1.5}
.cost-foot a{color:var(--mix)}

/* ---- isometric diagram ---- */
.diagram-card{background:linear-gradient(180deg,var(--concrete-2),var(--white));border:1px solid var(--line);border-radius:11px;padding:8px 8px 6px;margin-bottom:16px;display:flex;flex-direction:column;align-items:center}
.isobox{width:100%;max-width:300px;height:200px;display:block}
.diagram-hint{font-family:'JetBrains Mono';font-size:10.5px;color:var(--steel-soft);padding-bottom:4px}

/* ---- grade presets ---- */
.presets{margin-bottom:15px}
.presets-label{display:block;font-size:12px;font-weight:600;color:var(--steel);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:6px}
.preset-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}
.preset{display:flex;flex-direction:column;align-items:flex-start;gap:1px;padding:9px 11px;border:1px solid var(--line);background:var(--concrete-2);border-radius:9px;cursor:pointer;transition:all .14s;text-align:left;font-family:'Inter',sans-serif}
.preset b{font-family:'Archivo';font-weight:700;font-size:15px;color:var(--ink)}
.preset span{font-family:'JetBrains Mono';font-size:11px;color:var(--steel-soft)}
.preset em{font-style:normal;font-size:10.5px;color:var(--steel-soft);line-height:1.2}
.preset:hover{border-color:var(--grey)}
.preset.active{border-color:var(--mix);background:rgba(209,79,42,0.07);box-shadow:0 0 0 1px var(--mix)}
.preset.active b{color:var(--mix)}
.preset-note{font-size:11.5px;color:var(--steel-soft);margin-top:8px;font-family:'JetBrains Mono';min-height:14px}

/* ---- dry-volume trust indicator ---- */
.dryflag{display:inline-flex;align-items:center;gap:7px;font-family:'JetBrains Mono';font-size:11.5px;font-weight:500;background:rgba(232,137,58,0.10);border:1px solid rgba(232,137,58,0.4);color:var(--steel);padding:6px 10px;border-radius:7px;position:relative;cursor:help;margin-bottom:14px}
.dryflag .tick{color:var(--mix);font-weight:700}
.dryflag b{color:var(--ink);font-weight:600}
.dryflag .info{display:inline-flex;align-items:center;justify-content:center;width:14px;height:14px;border-radius:50%;border:1px solid var(--steel-soft);color:var(--steel-soft);font-size:9px;font-style:normal}
.dryflag .tip{position:absolute;bottom:calc(100% + 8px);left:0;width:260px;background:var(--ink);color:var(--white);font-family:'Inter',sans-serif;font-size:12px;font-weight:400;line-height:1.5;padding:11px 13px;border-radius:9px;box-shadow:0 10px 30px -10px rgba(0,0,0,0.5);opacity:0;visibility:hidden;transform:translateY(4px);transition:opacity .15s,transform .15s,visibility .15s;z-index:20}
.dryflag .tip::after{content:"";position:absolute;top:100%;left:18px;border:6px solid transparent;border-top-color:var(--ink)}
.dryflag .tip code{font-family:'JetBrains Mono';background:rgba(255,255,255,0.1);color:var(--amber);padding:1px 5px;border-radius:4px;font-size:11px}
.dryflag .tip a{color:var(--amber);text-decoration:underline}
.dryflag:hover .tip,.dryflag:focus-within .tip{opacity:1;visibility:visible;transform:translateY(0)}

/* ad slot */
.ad{max-width:var(--maxw);margin:0 auto;padding:18px 24px 0}
.ad .slot{border:1px dashed var(--grey);border-radius:8px;color:var(--steel-soft);font-family:'JetBrains Mono';font-size:11px;text-align:center;padding:14px;background:var(--concrete-2)}

/* footer */
footer{background:var(--ink);color:var(--grey);padding:52px 0 32px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1.1fr 1.1fr 1fr 1fr;gap:30px}
@media(max-width:980px){.foot-grid{grid-template-columns:1fr 1fr 1fr}.foot-about{grid-column:1/-1}}
@media(max-width:600px){.foot-grid{grid-template-columns:1fr 1fr;gap:24px}}
footer .logo{color:var(--white);margin-bottom:12px}
footer p.about{font-size:15px;color:#C5CBD3;max-width:30em;line-height:1.6}
footer h5{color:var(--white);font-family:'Archivo';font-weight:700;font-size:15px;text-transform:uppercase;letter-spacing:0.06em;margin-bottom:14px}
footer ul{list-style:none}
footer li{margin-bottom:10px}
footer li a{font-size:15px;color:#C5CBD3;transition:color .15s;line-height:1.5}
footer li a:hover{color:var(--amber)}
.foot-bottom{border-top:1px solid #2A313A;margin-top:38px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:14px;color:#AEB6C0;font-family:'JetBrains Mono'}

/* consent bar */
#consentBar{display:none;position:fixed;bottom:0;left:0;right:0;z-index:100;background:var(--ink);color:var(--white);padding:16px 24px;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:2px solid var(--amber)}
#consentBar p{font-size:13px;color:var(--grey);max-width:60ch}
#consentBar .btns{display:flex;gap:10px}
#consentBar button{border:0;border-radius:7px;padding:9px 16px;font-weight:600;font-size:13px;cursor:pointer}
#consentAccept{background:var(--amber);color:var(--ink)}
#consentDecline{background:transparent;color:var(--grey);border:1px solid #3A4654}

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