/* Halvern Industrial — demo B2B export site (fictional brand) */
:root{
  --ink:#14202e; --ink-2:#3b4a5c; --muted:#6b7a8c;
  --steel:#1f3a56; --steel-2:#2c5079; --line:#dde3ea;
  --bg:#ffffff; --bg-2:#f3f6f9; --accent:#e08a1e; --accent-ink:#1a1206;
  --ok:#1f7a4d; --warn-bg:#fff6e6; --warn-line:#f0c27a;
  --radius:10px; --max:1160px;
  --font:"Inter","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px}
img,svg{max-width:100%;display:block}
a{color:var(--steel-2)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* demo notice */
.demo-bar{background:var(--warn-bg);border-bottom:1px solid var(--warn-line);font-size:13px;color:#6a4a10;text-align:center;padding:7px 16px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:700;letter-spacing:.2px}
.brand small{display:block;font-weight:500;color:var(--muted);font-size:11px;letter-spacing:1.2px;text-transform:uppercase}
.nav-links{display:flex;gap:28px;align-items:center;list-style:none;margin:0;padding:0}
.nav-links a{text-decoration:none;color:var(--ink-2);font-weight:500;font-size:15px}
.nav-links a[aria-current="page"]{color:var(--steel)}
.nav-links a[aria-current="page"]::after{content:"";display:block;height:2px;background:var(--accent);margin-top:3px}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font:inherit;cursor:pointer}

/* buttons */
.btn{display:inline-block;padding:12px 22px;border-radius:8px;font-weight:600;text-decoration:none;border:2px solid transparent;font-size:15px;cursor:pointer}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{filter:brightness(1.05)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-outline{border-color:var(--steel);color:var(--steel);background:#fff}

/* hero */
.hero{background:linear-gradient(135deg,var(--steel) 0%,#12263b 100%);color:#fff}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding:72px 0}
.eyebrow{font-size:12px;letter-spacing:1.6px;text-transform:uppercase;color:#f5b968;font-weight:600}
.hero h1{font-size:44px;line-height:1.15;margin:12px 0 16px}
.hero p{color:#cfdae6;font-size:18px;max-width:560px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.hero-facts{display:flex;gap:28px;margin-top:34px;flex-wrap:wrap}
.hero-facts div{font-size:13px;color:#a9bbcf}
.hero-facts strong{display:block;color:#fff;font-size:22px}
.hero-art{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:28px}

/* sections */
section{padding:72px 0}
.alt{background:var(--bg-2)}
.section-head{max-width:680px;margin-bottom:36px}
.section-head h2{font-size:32px;line-height:1.2;margin:8px 0 10px}
.section-head p{color:var(--ink-2);margin:0}
.kicker{font-size:12px;letter-spacing:1.6px;text-transform:uppercase;color:var(--accent);font-weight:700}

.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.card-media{background:var(--bg-2);border-bottom:1px solid var(--line);aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;padding:20px}
.card-body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-body h3{margin:0;font-size:19px}
.card-body p{margin:0;color:var(--ink-2);font-size:15px}
.card-body .more{margin-top:auto;padding-top:8px;font-weight:600;text-decoration:none}
.tag{display:inline-block;font-size:12px;font-weight:600;color:var(--steel);background:#e7eef6;border-radius:999px;padding:3px 10px;align-self:flex-start}

.feature{padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.feature .icon{width:40px;height:40px;border-radius:8px;background:#e7eef6;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.feature h3{margin:0 0 6px;font-size:17px}
.feature p{margin:0;color:var(--ink-2);font-size:15px}

/* process */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:step;list-style:none;padding:0;margin:0}
.steps li{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;font-size:14px;color:var(--ink-2)}
.steps li::before{counter-increment:step;content:"0" counter(step);display:block;font-weight:800;color:var(--accent);font-size:20px;margin-bottom:6px}
.steps strong{display:block;color:var(--ink);font-size:15px;margin-bottom:2px}

/* CTA band */
.cta-band{background:var(--steel);color:#fff;border-radius:16px;padding:40px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.cta-band h2{margin:0 0 6px;font-size:26px}
.cta-band p{margin:0;color:#cfdae6}

/* product detail */
.product{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;align-items:start;padding:40px 0;border-top:1px solid var(--line)}
.product:first-of-type{border-top:0}
.product-media{background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius);aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;padding:28px}
.product h2{margin:6px 0 8px;font-size:26px}
.product p{color:var(--ink-2)}
.spec{width:100%;border-collapse:collapse;font-size:14px;margin:14px 0 18px}
.spec th,.spec td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:top}
.spec th{width:38%;color:var(--muted);font-weight:600;background:var(--bg-2)}
.note{font-size:13px;color:var(--muted)}
.subnav{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:8px}
.subnav a{font-size:14px;text-decoration:none;border:1px solid var(--line);border-radius:999px;padding:6px 14px;color:var(--ink-2);background:#fff}

/* page header */
.page-head{background:var(--bg-2);border-bottom:1px solid var(--line);padding:48px 0}
.page-head h1{margin:6px 0 8px;font-size:36px}
.page-head p{margin:0;color:var(--ink-2);max-width:700px}

/* about */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.stat{border:1px solid var(--line);border-radius:var(--radius);padding:18px;background:#fff}
.stat strong{display:block;font-size:26px;color:var(--steel)}
.stat span{font-size:13px;color:var(--muted)}
.placeholder{border:1px dashed #b9c4d1;background:#fafbfd;border-radius:var(--radius);padding:16px;color:var(--muted);font-size:14px}
.checklist{list-style:none;padding:0;margin:0}
.checklist li{padding:8px 0 8px 28px;position:relative;border-bottom:1px solid var(--line);color:var(--ink-2)}
.checklist li::before{content:"";position:absolute;left:4px;top:15px;width:12px;height:7px;border-left:2px solid var(--ok);border-bottom:2px solid var(--ok);transform:rotate(-45deg)}

/* form */
.form-wrap{display:grid;grid-template-columns:1.3fr .7fr;gap:36px;align-items:start}
form.rfq{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{font-weight:600;font-size:14px}
label .req{color:#b4381f}
input,select,textarea{font:inherit;font-size:15px;padding:11px 12px;border:1px solid #c7d0db;border-radius:8px;background:#fff;color:var(--ink);width:100%}
input:focus,select:focus,textarea:focus{outline:2px solid var(--steel-2);outline-offset:1px;border-color:var(--steel-2)}
textarea{min-height:120px;resize:vertical}
.err{display:block;color:#b4381f;font-size:13px;line-height:18px;min-height:18px} /* V1.1: reserve one line so showing/clearing errors never shifts layout */
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:#b4381f}
.consent{display:flex;gap:10px;align-items:flex-start;font-weight:400;font-size:14px;color:var(--ink-2)}
.consent input{width:auto;margin-top:4px}
.demo-result{display:none;border:1px solid var(--warn-line);background:var(--warn-bg);border-radius:var(--radius);padding:18px;margin-top:18px;font-size:14px;color:#5a3e0c}
.demo-result.show{display:block}
.demo-result pre{white-space:pre-wrap;background:#fff;border:1px solid var(--warn-line);border-radius:6px;padding:10px;font-size:12.5px;margin:10px 0 0;color:var(--ink)}
.side-box{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:var(--bg-2)}
.side-box h3{margin:0 0 8px;font-size:17px}
.side-box p,.side-box li{font-size:14px;color:var(--ink-2)}
.side-box ul{padding-left:18px;margin:8px 0 0}

/* footer */
.site-footer{background:#0f1c2b;color:#9fb0c3;font-size:14px;padding:44px 0 24px;margin-top:0}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.site-footer h4{color:#fff;margin:0 0 10px;font-size:15px}
.site-footer a{color:#c9d6e3;text-decoration:none}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.foot-bottom{border-top:1px solid #23354a;margin-top:28px;padding-top:16px;font-size:12.5px;color:#7f93a8}

/* responsive */
@media (max-width:960px){
  .hero-grid,.two-col,.form-wrap,.product{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:36px}
}
@media (max-width:720px){
  .menu-btn{display:block}
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;gap:0;border-bottom:1px solid var(--line);padding:8px 20px 16px}
  .nav-links.open{display:flex}
  .nav-links li a{display:block;padding:12px 0;border-bottom:1px solid var(--line)}
  .nav-links li:last-child a{border:0;margin-top:10px;text-align:center}
  .nav-links a[aria-current="page"]::after{display:none}
  .grid-3,.grid-4,.row,.foot-grid,.stat-grid{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  section{padding:52px 0}
  .hero-grid{padding:48px 0}
  .hero h1{font-size:30px}
  .hero p{font-size:16px}
  .section-head h2{font-size:26px}
  .cta-band{padding:28px}
  .page-head h1{font-size:28px}
  form.rfq{padding:20px}
  .spec th{width:42%}
}