/* =========================================================================
   Mill River Duct & Vent Co. — Editorial Theme
   Class prefix: ldb-  (Lindbergh)
   Fonts: Zilla Slab (headings) + IBM Plex Sans (body) — Google Fonts
   ========================================================================= */

:root{
  --ldb-ink:      #22262B;
  --ldb-graphite: #3C4148;
  --ldb-rust:     #B5502D;
  --ldb-rust-2:   #93401F;
  --ldb-forest:   #2F4F3E;
  --ldb-forest-2: #4C7360;
  --ldb-parchment:#F7F3EC;
  --ldb-sage:     #E7ECE4;
  --ldb-line:     #DCD5C6;
  --ldb-white:    #FFFFFF;
  --ldb-muted:    #6B6459;

  --ldb-head: 'Zilla Slab', Georgia, serif;
  --ldb-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --ldb-shell: 1160px;
  --ldb-shadow: 0 22px 46px -22px rgba(34,38,43,0.32);
  --ldb-shadow-sm: 0 6px 18px -8px rgba(34,38,43,0.22);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0; font-family:var(--ldb-body); color:var(--ldb-graphite);
  background:var(--ldb-white); line-height:1.7; font-size:16.5px;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--ldb-head); color:var(--ldb-ink); line-height:1.2; margin:0 0 .5em; font-weight:600; }
h1{ font-size:clamp(2.3rem,4.6vw,3.6rem); font-weight:700; }
h2{ font-size:clamp(1.7rem,3vw,2.3rem); }
h3{ font-size:1.3rem; }
p{ margin:0 0 1.15em; }
ul{ margin:0; padding:0; list-style:none; }

.ldb-shell{ max-width:var(--ldb-shell); margin:0 auto; padding:0 26px; }
.ldb-block{ padding:80px 0; }
.ldb-block--tight{ padding:50px 0; }
.ldb-block--parchment{ background:var(--ldb-parchment); }
.ldb-block--sage{ background:var(--ldb-sage); }
.ldb-block--ink{ background:var(--ldb-ink); color:#C7CDD1; }
.ldb-block--ink h2, .ldb-block--ink h3{ color:var(--ldb-white); }

.ldb-tag{
  display:inline-block; text-transform:uppercase; letter-spacing:.18em; font-size:.72rem;
  font-weight:700; color:var(--ldb-rust); border-bottom:2px solid var(--ldb-rust);
  padding-bottom:5px; margin-bottom:18px;
}
.ldb-lede{ font-size:1.12rem; color:var(--ldb-muted); max-width:68ch; }

/* ---------------- Utility bar + header ---------------- */
.ldb-utility{ background:var(--ldb-ink); color:#B7BDC1; font-size:.8rem; }
.ldb-utility .ldb-shell{ display:flex; justify-content:space-between; padding:8px 0; flex-wrap:wrap; gap:6px; }
.ldb-utility a{ color:#B7BDC1; }
.ldb-utility a:hover{ color:var(--ldb-white); }

.ldb-header{ border-bottom:1px solid var(--ldb-line); background:var(--ldb-white); position:sticky; top:0; z-index:70; }
.ldb-header .ldb-shell{ display:flex; align-items:center; justify-content:space-between; padding:16px 0; gap:20px; }
.ldb-brand{ display:flex; align-items:center; gap:12px; }
.ldb-brand img{ height:50px; }
.ldb-brand-copy strong{ font-family:var(--ldb-head); font-size:1.15rem; color:var(--ldb-ink); display:block; }
.ldb-brand-copy span{ font-size:.7rem; letter-spacing:.12em; text-transform:uppercase; color:var(--ldb-rust); }

.ldb-menu{ display:flex; align-items:center; gap:34px; }
.ldb-menu-list{ display:flex; gap:26px; }
.ldb-menu-list > li{ position:relative; }
.ldb-menu-list a{ font-weight:600; font-size:.92rem; color:var(--ldb-ink); }
.ldb-menu-list a:hover{ color:var(--ldb-rust); }
.ldb-menu-list li[aria-current="page"] > a{ color:var(--ldb-rust); }
.ldb-has-drop > .ldb-dropdown{
  display:none; position:absolute; top:100%; left:0; background:var(--ldb-white);
  border:1px solid var(--ldb-line); box-shadow:var(--ldb-shadow-sm); min-width:230px; padding:10px; margin-top:14px;
}
.ldb-has-drop:hover > .ldb-dropdown{ display:block; }
.ldb-dropdown li{ padding:2px; }
.ldb-dropdown a{ display:block; padding:9px 12px; font-size:.85rem; font-weight:500; }
.ldb-dropdown a:hover{ background:var(--ldb-parchment); }

.ldb-cta-btn{
  display:inline-flex; align-items:center; gap:8px; background:var(--ldb-rust); color:var(--ldb-white);
  padding:12px 22px; font-weight:700; font-size:.85rem; text-transform:uppercase; letter-spacing:.06em;
  border-radius:3px; transition:background .15s ease;
}
.ldb-cta-btn:hover{ background:var(--ldb-rust-2); }
.ldb-cta-btn--line{ background:transparent; border:1.5px solid currentColor; }
.ldb-cta-btn--line:hover{ background:rgba(255,255,255,0.08); }

.ldb-burger{ display:none; flex-direction:column; gap:5px; background:none; border:0; cursor:pointer; }
.ldb-burger span{ width:25px; height:2px; background:var(--ldb-ink); display:block; }

/* ---------------- Buttons (rectangular, editorial) ---------------- */
.ldb-btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  padding:15px 30px; border-radius:3px; font-weight:700; font-size:.86rem;
  text-transform:uppercase; letter-spacing:.07em; cursor:pointer; border:1.5px solid transparent;
}
.ldb-btn--solid{ background:var(--ldb-rust); color:var(--ldb-white); }
.ldb-btn--solid:hover{ background:var(--ldb-rust-2); }
.ldb-btn--forest{ background:var(--ldb-forest); color:var(--ldb-white); }
.ldb-btn--forest:hover{ background:#25402f; }
.ldb-btn--outline{ border-color:var(--ldb-ink); color:var(--ldb-ink); }
.ldb-btn--outline:hover{ background:var(--ldb-ink); color:var(--ldb-white); }
.ldb-btn--outline-light{ border-color:#fff; color:#fff; }
.ldb-btn--outline-light:hover{ background:rgba(255,255,255,0.12); }
.ldb-btn-row{ display:flex; gap:16px; flex-wrap:wrap; }

/* ---------------- Full-bleed hero ---------------- */
.ldb-hero{ position:relative; min-height:640px; display:flex; align-items:center; background-size:cover; background-position:center; }
.ldb-hero::before{ content:""; position:absolute; inset:0; background:linear-gradient(100deg, rgba(34,38,43,0.92) 15%, rgba(34,38,43,0.55) 55%, rgba(34,38,43,0.35) 100%); }
.ldb-hero-inner{ position:relative; z-index:2; color:#fff; padding:100px 0 130px; }
.ldb-hero-inner .ldb-tag{ color:#E9A57F; border-color:#E9A57F; }
.ldb-hero-inner h1{ color:#fff; max-width:16ch; }
.ldb-hero-inner p.ldb-lede{ color:#D9DCDD; }

.ldb-stat-strip{
  position:relative; z-index:3; background:var(--ldb-white); box-shadow:var(--ldb-shadow);
  margin-top:-70px; border-radius:4px;
}
.ldb-stat-strip .ldb-shell{ display:grid; grid-template-columns:repeat(4,1fr); }
.ldb-stat{ padding:26px 20px; text-align:center; border-right:1px solid var(--ldb-line); }
.ldb-stat:last-child{ border-right:none; }
.ldb-stat b{ display:block; font-family:var(--ldb-head); font-size:1.8rem; color:var(--ldb-rust); }
.ldb-stat span{ font-size:.78rem; text-transform:uppercase; letter-spacing:.06em; color:var(--ldb-muted); }

/* ---------------- Service rows (list, not cards) ---------------- */
.ldb-service-row{
  display:grid; grid-template-columns:80px 1fr auto; gap:26px; align-items:center;
  padding:30px 0; border-top:1px solid var(--ldb-line);
}
.ldb-service-row:last-child{ border-bottom:1px solid var(--ldb-line); }
.ldb-service-icon{
  width:64px; height:64px; border:1.5px solid var(--ldb-ink); border-radius:3px;
  display:flex; align-items:center; justify-content:center;
}
.ldb-service-icon svg{ width:30px; height:30px; stroke:var(--ldb-ink); }
.ldb-service-row h3{ margin-bottom:6px; }
.ldb-service-row p{ margin-bottom:0; color:var(--ldb-muted); max-width:62ch; }
.ldb-service-row .ldb-row-link{ font-weight:700; font-size:.85rem; color:var(--ldb-rust); white-space:nowrap; }

/* ---------------- Long-form essay blocks ---------------- */
.ldb-essay{ max-width:760px; }
.ldb-essay h2{ margin-top:1.3em; }
.ldb-essay h3{ color:var(--ldb-forest); margin-top:1.1em; }
.ldb-two-col{ display:grid; grid-template-columns:1fr 1fr; gap:50px; }
.ldb-two-col--essay-media{ display:grid; grid-template-columns: 1.15fr .85fr; gap:50px; align-items:center; }

/* ---------------- Alternating timeline ---------------- */
.ldb-timeline{ position:relative; margin-top:40px; }
.ldb-timeline::before{ content:""; position:absolute; left:50%; top:0; bottom:0; width:2px; background:var(--ldb-line); transform:translateX(-50%); }
.ldb-tl-item{ display:grid; grid-template-columns:1fr 60px 1fr; align-items:center; gap:0; margin-bottom:10px; }
.ldb-tl-item .ldb-tl-copy{ padding:26px; }
.ldb-tl-item:nth-child(odd) .ldb-tl-copy{ grid-column:1; text-align:right; }
.ldb-tl-item:nth-child(even) .ldb-tl-copy{ grid-column:3; text-align:left; }
.ldb-tl-node{
  grid-column:2; width:46px; height:46px; border-radius:50%; background:var(--ldb-forest); color:#fff;
  display:flex; align-items:center; justify-content:center; font-family:var(--ldb-head); font-weight:700; margin:0 auto;
  position:relative; z-index:2;
}

/* ---------------- Pull-quote testimonials ---------------- */
.ldb-quote-layout{ display:grid; grid-template-columns:1.3fr 1fr; gap:56px; align-items:start; }
.ldb-pullquote{ position:relative; padding-left:40px; }
.ldb-pullquote .ldb-mark{ font-family:var(--ldb-head); font-size:5rem; color:var(--ldb-rust); position:absolute; left:-14px; top:-30px; opacity:.5; }
.ldb-pullquote p{ font-family:var(--ldb-head); font-size:1.5rem; color:var(--ldb-ink); line-height:1.45; }
.ldb-pullquote cite{ display:block; font-style:normal; font-weight:700; font-size:.88rem; color:var(--ldb-rust); margin-top:14px; }
.ldb-mini-quote{ border-top:1px solid var(--ldb-line); padding:18px 0; }
.ldb-mini-quote p{ margin-bottom:6px; font-size:.94rem; }
.ldb-mini-quote span{ font-size:.8rem; color:var(--ldb-muted); font-weight:600; }

/* ---------------- Masonry-ish gallery ---------------- */
.ldb-masonry{ display:grid; grid-template-columns:repeat(4,1fr); grid-auto-rows:120px; gap:14px; }
.ldb-masonry figure{ margin:0; overflow:hidden; border-radius:3px; position:relative; }
.ldb-masonry img{ width:100%; height:100%; object-fit:cover; }
.ldb-masonry figcaption{ position:absolute; left:0; right:0; bottom:0; background:linear-gradient(0deg,rgba(34,38,43,0.85),transparent); color:#fff; padding:22px 12px 10px; font-size:.8rem; font-weight:600; }
.ldb-m-a{ grid-column:span 2; grid-row:span 3; }
.ldb-m-b{ grid-column:span 2; grid-row:span 2; }
.ldb-m-c{ grid-column:span 1; grid-row:span 2; }
.ldb-m-d{ grid-column:span 3; grid-row:span 2; }
.ldb-m-e{ grid-column:span 1; grid-row:span 2; }

/* ---------------- Articles / Learning Center ---------------- */
.ldb-article-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:28px; }
.ldb-article-card{ border:1px solid var(--ldb-line); border-radius:4px; overflow:hidden; background:var(--ldb-white); display:flex; flex-direction:column; }
.ldb-article-thumb{ background:var(--ldb-forest); color:#fff; padding:30px 24px; }
.ldb-article-thumb .ldb-cat{ font-size:.7rem; text-transform:uppercase; letter-spacing:.1em; opacity:.8; }
.ldb-article-card .ldb-article-body{ padding:22px 24px 26px; flex:1; display:flex; flex-direction:column; }
.ldb-article-card h3{ font-size:1.12rem; }
.ldb-article-card p{ color:var(--ldb-muted); font-size:.92rem; flex:1; }
.ldb-article-meta{ font-size:.78rem; color:var(--ldb-rust); font-weight:700; text-transform:uppercase; letter-spacing:.05em; margin-top:auto; }

.ldb-article-layout{ display:grid; grid-template-columns:250px 1fr; gap:56px; align-items:start; }
.ldb-toc{ position:sticky; top:100px; border-left:2px solid var(--ldb-line); padding-left:20px; }
.ldb-toc-label{ font-size:.72rem; text-transform:uppercase; letter-spacing:.14em; color:var(--ldb-rust); font-weight:700; margin-bottom:14px; display:block; }
.ldb-toc a{ display:block; font-size:.86rem; padding:6px 0; color:var(--ldb-muted); font-weight:600; }
.ldb-toc a:hover{ color:var(--ldb-rust); }
.ldb-article-callout{ background:var(--ldb-parchment); border-left:4px solid var(--ldb-rust); padding:22px 26px; margin:32px 0; border-radius:0 3px 3px 0; }
.ldb-article-callout p{ margin-bottom:10px; }
.ldb-byline{ display:flex; align-items:center; gap:14px; padding:20px 0; border-top:1px solid var(--ldb-line); border-bottom:1px solid var(--ldb-line); margin:34px 0; }
.ldb-byline-avatar{ width:46px; height:46px; border-radius:50%; background:var(--ldb-forest); color:#fff; display:flex; align-items:center; justify-content:center; font-family:var(--ldb-head); font-weight:700; }
.ldb-byline strong{ display:block; font-size:.92rem; color:var(--ldb-ink); }
.ldb-byline span{ font-size:.78rem; color:var(--ldb-muted); }
.ldb-related-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin-top:20px; }
.ldb-related-card{ border:1px solid var(--ldb-line); padding:18px 20px; border-radius:4px; }
.ldb-related-card span{ font-size:.72rem; text-transform:uppercase; color:var(--ldb-rust); font-weight:700; letter-spacing:.06em; }
.ldb-related-card h4{ font-family:var(--ldb-head); font-size:1rem; margin:6px 0 0; color:var(--ldb-ink); }

/* ---------------- Area list ---------------- */
.ldb-area-list{ columns:3; column-gap:40px; }
.ldb-area-list li{ break-inside:avoid; padding:9px 0; border-bottom:1px dotted var(--ldb-line); font-weight:600; color:var(--ldb-ink); }

/* ---------------- FAQ ---------------- */
.ldb-faq{ border-bottom:1px solid var(--ldb-line); padding:20px 0; }
.ldb-faq-q{ display:flex; justify-content:space-between; gap:16px; cursor:pointer; font-family:var(--ldb-head); font-weight:600; font-size:1.08rem; }
.ldb-faq-q::after{ content:"+"; font-size:1.4rem; color:var(--ldb-rust); flex-shrink:0; }
.ldb-faq.ldb-open .ldb-faq-q::after{ content:"–"; }
.ldb-faq-a{ max-height:0; overflow:hidden; transition:max-height .25s ease; }
.ldb-faq.ldb-open .ldb-faq-a{ max-height:600px; }
.ldb-faq-a p{ padding-top:12px; }

/* ---------------- Map & contact ---------------- */
.ldb-map-box{ border:1px solid var(--ldb-line); border-radius:4px; overflow:hidden; }
.ldb-map-box iframe{ width:100%; height:400px; border:0; display:block; }
.ldb-contact-layout{ display:grid; grid-template-columns:1fr 1fr; gap:50px; }
.ldb-form{ border:1px solid var(--ldb-line); padding:34px; border-radius:4px; background:var(--ldb-parchment); }
.ldb-field{ margin-bottom:18px; }
.ldb-field label{ display:block; font-weight:700; font-size:.82rem; text-transform:uppercase; letter-spacing:.05em; color:var(--ldb-ink); margin-bottom:7px; }
.ldb-field input, .ldb-field select, .ldb-field textarea{
  width:100%; padding:13px 14px; border:1.5px solid var(--ldb-line); border-radius:3px; font-family:var(--ldb-body);
  font-size:.96rem; background:#fff;
}
.ldb-field textarea{ min-height:120px; resize:vertical; }
.ldb-field input:focus, .ldb-field select:focus, .ldb-field textarea:focus{ outline:2px solid var(--ldb-rust); }
.ldb-form-success{ display:none; background:#E4F0E7; border:1px solid #9CC7A8; color:#2F4F3E; padding:14px 18px; border-radius:3px; font-weight:600; font-size:.9rem; margin-bottom:18px; }
.ldb-form-success.ldb-show{ display:block; }
.ldb-info-rows{ display:flex; flex-direction:column; gap:22px; margin-bottom:26px; }
.ldb-info-row{ display:flex; gap:16px; align-items:flex-start; }
.ldb-info-row svg{ width:24px; height:24px; stroke:var(--ldb-rust); flex-shrink:0; margin-top:2px; }
.ldb-info-row strong{ display:block; color:var(--ldb-ink); }

/* ---------------- CTA strip ---------------- */
.ldb-cta-strip{ background:var(--ldb-forest); color:#fff; padding:56px 0; text-align:center; }
.ldb-cta-strip h2{ color:#fff; }
.ldb-cta-strip .ldb-btn-row{ justify-content:center; margin-top:18px; }

/* ---------------- Page header ---------------- */
.ldb-pagehead{ background:var(--ldb-ink); color:#fff; padding:60px 0 46px; }
.ldb-crumbs{ font-size:.8rem; color:#9DA4A9; margin-bottom:16px; }
.ldb-crumbs a{ color:#D6DADD; font-weight:600; }
.ldb-pagehead h1{ color:#fff; }
.ldb-pagehead p{ color:#C7CDD1; max-width:70ch; }

/* ---------------- Footer ---------------- */
.ldb-precta{ background:var(--ldb-parchment); padding:44px 0; }
.ldb-precta .ldb-shell{ display:flex; justify-content:space-between; align-items:center; gap:26px; flex-wrap:wrap; }
.ldb-precta-form{ display:flex; gap:10px; }
.ldb-precta-form input{ padding:12px 14px; border:1.5px solid var(--ldb-line); border-radius:3px; min-width:240px; }

.ldb-footer{ background:var(--ldb-ink); color:#9DA4A9; padding-top:56px; }
.ldb-footer-grid{ display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:36px; padding-bottom:36px; }
.ldb-footer h4{ color:#fff; font-size:.95rem; text-transform:uppercase; letter-spacing:.06em; margin-bottom:16px; }
.ldb-footer-brand{ display:flex; align-items:center; gap:10px; margin-bottom:14px; }
.ldb-footer-brand img{ height:40px; }
.ldb-footer-brand strong{ color:#fff; font-family:var(--ldb-head); }
.ldb-footer ul li{ padding:5px 0; }
.ldb-footer ul li a:hover{ color:var(--ldb-rust); }
.ldb-footer-bottom{ border-top:1px solid rgba(255,255,255,0.1); padding:18px 0; text-align:center; font-size:.8rem; }

/* ---------------- Responsive ---------------- */
@media (max-width:980px){
  .ldb-two-col, .ldb-two-col--essay-media, .ldb-contact-layout, .ldb-quote-layout{ grid-template-columns:1fr; }
  .ldb-stat-strip .ldb-shell{ grid-template-columns:repeat(2,1fr); }
  .ldb-stat{ border-bottom:1px solid var(--ldb-line); }
  .ldb-article-grid, .ldb-related-grid{ grid-template-columns:repeat(2,1fr); }
  .ldb-article-layout{ grid-template-columns:1fr; }
  .ldb-toc{ position:static; border-left:none; border-top:2px solid var(--ldb-line); padding-left:0; padding-top:16px; }
  .ldb-area-list{ columns:2; }
  .ldb-masonry{ grid-template-columns:repeat(2,1fr); }
  .ldb-m-a,.ldb-m-b,.ldb-m-c,.ldb-m-d,.ldb-m-e{ grid-column:span 1; grid-row:span 2; }
  .ldb-footer-grid{ grid-template-columns:1fr 1fr; }
}
@media (max-width:720px){
  .ldb-menu-list, .ldb-utility{ display:none; }
  .ldb-burger{ display:flex; }
  .ldb-header.ldb-open .ldb-menu-list{
    display:flex; flex-direction:column; position:absolute; left:0; right:0; top:100%; background:#fff;
    border-bottom:1px solid var(--ldb-line); padding:18px 24px; gap:14px;
  }
  .ldb-service-row{ grid-template-columns:56px 1fr; }
  .ldb-service-row .ldb-row-link{ grid-column:2; }
  .ldb-timeline::before{ left:20px; }
  .ldb-tl-item{ grid-template-columns:40px 1fr; }
  .ldb-tl-node{ grid-column:1; width:38px; height:38px; font-size:.85rem; }
  .ldb-tl-item:nth-child(odd) .ldb-tl-copy, .ldb-tl-item:nth-child(even) .ldb-tl-copy{ grid-column:2; text-align:left; }
  .ldb-article-grid, .ldb-related-grid{ grid-template-columns:1fr; }
  .ldb-area-list{ columns:1; }
  .ldb-footer-grid{ grid-template-columns:1fr; }
  .ldb-precta .ldb-shell{ flex-direction:column; align-items:flex-start; }
}