/* ConcreteCalcTools — rugged industrial theme */
:root{
  --charcoal:#1d1d1f;
  --concrete:#2a2b2e;
  --steel:#3a3c41;
  --ash:#6c7077;
  --fog:#edebe6;
  --paper:#f6f5f1;
  --white:#ffffff;
  --orange:#e8602c;
  --orange-dark:#c44a1c;
  --amber:#f6a623;
  --line:rgba(20,20,22,.12);
  --line-strong:rgba(20,20,22,.22);
  --good:#2f7d4f;
  --shadow:0 1px 0 rgba(0,0,0,.04), 0 8px 24px rgba(20,20,22,.08);
  --shadow-lg:0 18px 50px rgba(20,20,22,.18);
  --radius:14px;
  --radius-sm:9px;
  --maxw:1120px;
  --head:'Oswald',system-ui,Impact,sans-serif;
  --body:'Inter',system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--body);color:var(--charcoal);
  background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--orange-dark);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
h1,h2,h3,h4{font-family:var(--head);font-weight:600;line-height:1.08;letter-spacing:.2px;margin:0 0 .5em}
h1{font-size:clamp(2.1rem,5vw,3.5rem);text-transform:uppercase;letter-spacing:.5px}
h2{font-size:clamp(1.5rem,3vw,2.1rem);text-transform:uppercase}
h3{font-size:1.15rem;font-weight:500;text-transform:uppercase;letter-spacing:.4px}
p{margin:0 0 1rem}

/* ---- Header ---- */
.site-header{position:sticky;top:0;z-index:50;background:var(--charcoal);
  border-bottom:3px solid var(--orange)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:11px}
.brand:hover{text-decoration:none}
.brand .mark{flex:0 0 auto}
.brand .name{font-family:var(--head);font-weight:600;font-size:1.32rem;
  text-transform:uppercase;letter-spacing:.5px;line-height:1;color:#fff}
.brand .name .accent{color:var(--orange)}
.brand .tag{display:block;font-family:var(--body);font-weight:500;font-size:.62rem;
  letter-spacing:2.5px;text-transform:uppercase;color:var(--ash);margin-top:3px}
.nav{display:flex;align-items:center;gap:6px}
.nav a{color:#d7d8db;font-weight:600;font-size:.82rem;text-transform:uppercase;
  letter-spacing:.6px;padding:9px 13px;border-radius:8px}
.nav a:hover{color:#fff;background:rgba(255,255,255,.08);text-decoration:none}
.nav a.cta{background:var(--orange);color:#fff}
.nav a.cta:hover{background:var(--orange-dark)}
.menu-btn{display:none;background:none;border:1px solid #4a4b4f;border-radius:8px;
  width:42px;height:38px;color:#fff;font-size:1.2rem;cursor:pointer}
@media(max-width:760px){
  .menu-btn{display:block}
  .nav{position:absolute;top:68px;left:0;right:0;background:var(--charcoal);
    flex-direction:column;align-items:stretch;gap:0;padding:8px 14px 16px;
    border-bottom:3px solid var(--orange);display:none}
  .nav.open{display:flex}
  .nav a{padding:13px 12px;border-radius:0;border-bottom:1px solid rgba(255,255,255,.06)}
  .nav a.cta{margin-top:8px;border-radius:8px;text-align:center}
}

/* ---- Hero ---- */
.hero{position:relative;background:var(--concrete);color:#fff;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;opacity:.5;
  background:
    repeating-linear-gradient(135deg,rgba(255,255,255,.018) 0 2px,transparent 2px 9px),
    radial-gradient(1200px 400px at 80% -10%,rgba(232,96,44,.28),transparent 60%)}
.hero .wrap{position:relative;padding:64px 22px 60px}
.hero .eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--head);
  font-weight:500;text-transform:uppercase;letter-spacing:2px;font-size:.78rem;
  color:var(--amber);margin-bottom:14px}
.hero .eyebrow::before{content:"";width:26px;height:3px;background:var(--orange);display:inline-block}
.hero h1{color:#fff;max-width:14ch}
.hero h1 em{color:var(--orange);font-style:normal}
.hero p.sub{font-size:1.15rem;color:#d6d7da;max-width:52ch;margin:6px 0 26px}
.hero .actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:30px;align-items:center}
.hero-art{width:100%;max-width:520px;margin-left:auto;filter:drop-shadow(0 20px 40px rgba(0,0,0,.35))}
@media(max-width:820px){
  .hero-grid{grid-template-columns:1fr}
  .hero-art{max-width:420px;margin:6px auto 0}
}
.tool-hero .wrap{position:relative}
.tool-art{position:absolute;right:24px;bottom:-2px;width:150px;opacity:.92;pointer-events:none}
@media(max-width:760px){.tool-art{display:none}}

/* ---- Buttons ---- */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--head);
  font-weight:600;text-transform:uppercase;letter-spacing:.7px;font-size:.95rem;
  padding:14px 24px;border-radius:10px;border:0;cursor:pointer;transition:.15s;
  text-decoration:none}
.btn-primary{background:var(--orange);color:#fff;box-shadow:0 6px 0 var(--orange-dark)}
.btn-primary:hover{background:var(--orange-dark);box-shadow:0 4px 0 var(--orange-dark);
  transform:translateY(2px);text-decoration:none}
.btn-ghost{background:transparent;color:#fff;border:2px solid rgba(255,255,255,.35)}
.btn-ghost:hover{border-color:#fff;text-decoration:none}
.btn-dark{background:var(--charcoal);color:#fff}
.btn-dark:hover{background:var(--steel);text-decoration:none}
.btn-block{width:100%;justify-content:center}

/* ---- Trust strip ---- */
.trust{background:var(--charcoal);color:#cfd0d3;border-top:1px solid #333}
.trust .wrap{display:flex;flex-wrap:wrap;justify-content:center;gap:14px 34px;
  padding:16px 22px;font-size:.82rem;font-weight:600;letter-spacing:.5px;
  text-transform:uppercase}
.trust span{display:inline-flex;align-items:center;gap:8px}
.trust .dot{color:var(--orange);font-size:1rem}

/* ---- Sections ---- */
section{padding:62px 0}
.section-head{text-align:center;max-width:62ch;margin:0 auto 38px}
.section-head .kicker{font-family:var(--head);text-transform:uppercase;letter-spacing:2px;
  color:var(--orange-dark);font-size:.82rem;font-weight:600;margin-bottom:8px}
.section-head p{color:var(--ash)}

/* ---- Calculator grid ---- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;transition:.16s;display:flex;flex-direction:column;position:relative;
  box-shadow:var(--shadow)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);
  border-color:var(--line-strong);text-decoration:none}
.card .ico{width:46px;height:46px;border-radius:11px;background:var(--fog);
  display:flex;align-items:center;justify-content:center;margin-bottom:15px;
  border:1px solid var(--line)}
.card .ico svg{width:26px;height:26px}
.card h3{color:var(--charcoal);margin-bottom:7px}
.card p{color:var(--ash);font-size:.92rem;margin:0 0 16px;flex:1}
.card .go{font-family:var(--head);font-weight:600;text-transform:uppercase;
  letter-spacing:.6px;font-size:.85rem;color:var(--orange-dark)}
.card:hover .go{color:var(--orange)}

/* ---- Calculator tool ---- */
.tool-hero{background:var(--concrete);color:#fff;border-bottom:3px solid var(--orange)}
.tool-hero .wrap{padding:44px 22px 40px}
.tool-hero .crumbs{font-size:.8rem;color:var(--ash);margin-bottom:14px;font-weight:600;
  text-transform:uppercase;letter-spacing:.6px}
.tool-hero .crumbs a{color:var(--amber)}
.tool-hero h1{color:#fff;font-size:clamp(1.9rem,4vw,2.8rem)}
.tool-hero p{color:#d6d7da;max-width:60ch;margin:0}
.calc-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:26px;
  margin-top:-44px;position:relative;z-index:5}
@media(max-width:860px){.calc-layout{grid-template-columns:1fr;margin-top:-30px}}
.panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-lg);padding:26px}
.panel h2{font-size:1.2rem;margin-bottom:18px}
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;font-size:.82rem;text-transform:uppercase;
  letter-spacing:.5px;color:var(--steel);margin-bottom:6px}
.field input,.field select{width:100%;padding:13px 14px;border:1.5px solid var(--line-strong);
  border-radius:10px;font-size:1rem;font-family:var(--body);background:var(--white);
  color:var(--charcoal);transition:.15s}
.field input:focus,.field select:focus{outline:none;border-color:var(--orange);
  box-shadow:0 0 0 3px rgba(232,96,44,.18)}
.results .panel{background:var(--charcoal);border:0;color:#fff;height:100%}
.results h2{color:#fff}
.result-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;
  padding:15px 0;border-bottom:1px solid rgba(255,255,255,.1)}
.result-row:last-child{border-bottom:0}
.result-row .lbl{color:#b9bbbf;font-weight:600;font-size:.9rem}
.result-row .val{font-family:var(--head);font-weight:600;font-size:1.6rem;color:var(--amber)}
.result-row.hero-result .val{font-size:2.2rem;color:var(--orange)}
.note{font-size:.82rem;color:var(--ash);margin-top:14px}
.results .note{color:#9a9ca1}

/* ---- Content / prose ---- */
.prose{max-width:760px;margin:0 auto}
.prose h2{margin-top:8px}
.prose p{color:#3a3b3e}
.lead{font-size:1.12rem;color:var(--steel)}
.callout{background:var(--fog);border-left:4px solid var(--orange);border-radius:0 12px 12px 0;
  padding:18px 20px;margin:24px 0}
.callout strong{color:var(--charcoal)}

/* ---- FAQ ---- */
.faq{max-width:760px;margin:0 auto}
.faq details{background:var(--white);border:1px solid var(--line);border-radius:11px;
  padding:2px 20px;margin-bottom:12px;box-shadow:var(--shadow)}
.faq summary{font-family:var(--head);font-weight:500;font-size:1.05rem;cursor:pointer;
  padding:16px 0;list-style:none;display:flex;justify-content:space-between;
  align-items:center;gap:14px;color:var(--charcoal)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.5rem;color:var(--orange);font-weight:300;flex:0 0 auto}
.faq details[open] summary::after{content:"–"}
.faq details p{color:#3a3b3e;margin:0 0 16px}
.alt{background:var(--fog)}

/* ---- Affiliate / supplier block ---- */
.supplier{background:var(--concrete);border-radius:var(--radius);padding:30px;
  text-align:center;color:#fff;margin:36px 0}
.supplier h3{color:#fff;font-size:1.3rem;margin-bottom:8px}
.supplier p{color:#cdced1;max-width:50ch;margin:0 auto 18px}
.supplier .actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}

/* ---- Forms (contact) ---- */
.form-card{max-width:560px;margin:0 auto;background:var(--white);border:1px solid var(--line);
  border-radius:var(--radius);padding:30px;box-shadow:var(--shadow)}
textarea{width:100%;padding:13px 14px;border:1.5px solid var(--line-strong);border-radius:10px;
  font-size:1rem;font-family:var(--body);min-height:130px;resize:vertical}
textarea:focus{outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(232,96,44,.18)}

/* ---- Footer ---- */
.site-footer{background:var(--charcoal);color:#aeb0b4;margin-top:20px}
.site-footer .wrap{padding:48px 22px 26px}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:30px;margin-bottom:32px}
@media(max-width:680px){.foot-grid{grid-template-columns:1fr 1fr}}
.foot-grid .blurb{max-width:34ch;font-size:.9rem;margin-top:12px}
.foot-col h4{font-family:var(--head);text-transform:uppercase;letter-spacing:1px;
  font-size:.85rem;color:#fff;margin-bottom:14px}
.foot-col a{display:block;color:#aeb0b4;font-size:.9rem;padding:5px 0}
.foot-col a:hover{color:var(--orange);text-decoration:none}
.foot-bottom{border-top:1px solid #333;padding-top:20px;display:flex;flex-wrap:wrap;
  justify-content:space-between;gap:12px;font-size:.8rem;color:#85878c}
.disclosure{background:#161617;color:#7f8186;font-size:.76rem;text-align:center;
  padding:14px 22px;line-height:1.5}
.disclosure .wrap{max-width:760px}

/* ---- Utility ---- */
.center{text-align:center}
.mt0{margin-top:0}
.tagline-bar{background:var(--orange);color:#fff;text-align:center;font-family:var(--head);
  font-weight:500;text-transform:uppercase;letter-spacing:1.5px;font-size:.8rem;padding:7px}