/* ==========================================================================
   ATBOM GROUP — Roofing & Energy Systems
   Design tokens: graphite ink / concrete / steel-blue / patina copper / amber
   Type: Big Shoulders Display (structural headlines) + IBM Plex Sans (body)
         + IBM Plex Mono (specs, data, labels)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Big+Shoulders+Display:wght@500;600;700;800;900&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --ink:        #171D20;   /* graphite — primary dark surface / text */
  --concrete:   #E7E8E1;   /* cool neutral — primary light surface */
  --steel:      #2E4650;   /* steel-blue — secondary dark surface (energy) */
  --patina:     #4F8F76;   /* oxidised copper green — primary accent */
  --amber:      #E8A23B;   /* solar amber — secondary accent */
  --white:      #FFFFFF;
  --ink-70:     rgba(23,29,32,0.70);
  --ink-50:     rgba(23,29,32,0.50);
  --line:       rgba(23,29,32,0.14);
  --line-on-dark: rgba(255,255,255,0.16);

  --display: 'Big Shoulders Display', sans-serif;
  --body:    'IBM Plex Sans', sans-serif;
  --mono:    'IBM Plex Mono', monospace;

  --container: 1200px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--body);
  color:var(--ink);
  background:var(--concrete);
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{ font-family:var(--display); font-weight:800; line-height:1.02; margin:0 0 .4em; letter-spacing:.002em; }
p{ margin:0 0 1em; }
.container{ max-width:var(--container); margin:0 auto; padding:0 28px; }

:focus-visible{ outline:3px solid var(--amber); outline-offset:2px; }

/* ---------- Type scale ---------- */
h1{ font-size:clamp(2.6rem,5.2vw,4.6rem); text-transform:uppercase; }
h2{ font-size:clamp(1.9rem,3.4vw,2.9rem); text-transform:uppercase; }
h3{ font-size:clamp(1.25rem,1.7vw,1.5rem); font-weight:700; text-transform:none; font-family:var(--body); }
.lede{ font-size:1.15rem; color:var(--ink-70); max-width:58ch; }

.eyebrow{
  font-family:var(--mono); font-size:.76rem; font-weight:600; letter-spacing:.14em;
  text-transform:uppercase; color:var(--patina); display:flex; align-items:center; gap:10px; margin-bottom:14px;
}
.eyebrow::before{ content:''; width:22px; height:2px; background:var(--patina); display:inline-block; }
.eyebrow.on-dark{ color:var(--amber); }
.eyebrow.on-dark::before{ background:var(--amber); }
.eyebrow.center{ justify-content:center; }
.eyebrow.center::before{ display:none; }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  font-family:var(--mono); font-weight:600; font-size:.86rem; letter-spacing:.04em; text-transform:uppercase;
  padding:15px 26px; border-radius:2px; border:1px solid transparent; cursor:pointer; transition:transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.btn-primary{ background:var(--amber); color:var(--ink); }
.btn-primary:hover{ background:#f2b45c; transform:translateY(-2px); }
.btn-outline{ background:transparent; color:var(--white); border-color:var(--line-on-dark); }
.btn-outline:hover{ border-color:var(--amber); color:var(--amber); }
.btn-outline-ink{ background:transparent; color:var(--ink); border-color:var(--line); }
.btn-outline-ink:hover{ border-color:var(--patina); color:var(--patina); }
.btn-block{ width:100%; }
.text-link{ font-family:var(--mono); font-size:.85rem; font-weight:600; text-transform:uppercase; letter-spacing:.05em; color:var(--patina); border-bottom:1px solid currentColor; padding-bottom:2px; }
.text-link:hover{ color:var(--steel); }

/* ==========================================================================
   HEADER / NAV
   ========================================================================== */
.site-header{ position:sticky; top:0; z-index:100; background:var(--ink); border-bottom:1px solid var(--line-on-dark); }
.nav{ max-width:var(--container); margin:0 auto; padding:0 28px; display:flex; align-items:center; justify-content:space-between; height:78px; }
.logo{ font-family:var(--display); font-weight:900; font-size:1.55rem; color:var(--white); letter-spacing:.01em; display:flex; align-items:baseline; gap:2px; }
.logo span{ color:var(--amber); }
.logo small{ font-family:var(--mono); font-size:.6rem; font-weight:500; letter-spacing:.18em; color:var(--patina); text-transform:uppercase; margin-left:8px; }
.nav-links{ display:flex; align-items:center; gap:34px; }
.nav-links a{ font-family:var(--mono); font-size:.82rem; font-weight:500; letter-spacing:.04em; text-transform:uppercase; color:rgba(255,255,255,0.75); padding:8px 0; border-bottom:2px solid transparent; }
.nav-links a:hover, .nav-links a.active{ color:var(--white); border-bottom-color:var(--amber); }
.nav-cta{ display:flex; align-items:center; gap:18px; }
.nav-toggle{ display:none; flex-direction:column; gap:5px; background:none; border:0; cursor:pointer; padding:6px; }
.nav-toggle span{ width:24px; height:2px; background:var(--white); display:block; transition:.2s; }

@media (max-width:900px){
  .nav-links{
    position:absolute; top:78px; left:0; right:0; background:var(--ink); flex-direction:column; align-items:flex-start;
    padding:8px 28px 24px; gap:4px; border-bottom:1px solid var(--line-on-dark);
    transform:translateY(-8px); opacity:0; pointer-events:none; transition:.2s ease;
  }
  .nav-links.open{ transform:translateY(0); opacity:1; pointer-events:auto; }
  .nav-links a{ width:100%; padding:12px 0; border-bottom:1px solid var(--line-on-dark); }
  .nav-cta .btn-primary{ display:none; }
  .nav-toggle{ display:flex; }
}

/* ==========================================================================
   SECTIONS
   ========================================================================== */
.section{ padding:96px 0; }
.section.tight{ padding:56px 0; }
.bg-paper{ background:var(--concrete); }
.bg-white{ background:var(--white); }
.bg-ink{ background:var(--ink); color:var(--white); }
.bg-ink .lede{ color:rgba(255,255,255,0.66); }
.bg-steel{ background:var(--steel); color:var(--white); }
.bg-steel .lede{ color:rgba(255,255,255,0.7); }
.section-head{ max-width:680px; margin-bottom:52px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }

/* ==========================================================================
   HERO — with exploded build-stack diagram (signature element)
   ========================================================================== */
.hero{ background:var(--ink); color:var(--white); position:relative; overflow:hidden; padding:64px 0 0; }
.hero-grid{ max-width:var(--container); margin:0 auto; padding:0 28px; display:grid; grid-template-columns:1.05fr .95fr; gap:40px; align-items:center; }
.hero-copy p.eyebrow{ margin-bottom:20px; }
.hero h1{ color:var(--white); }
.hero h1 em{ font-style:normal; color:var(--amber); }
.hero-sub{ color:rgba(255,255,255,0.68); font-size:1.08rem; max-width:50ch; margin-bottom:30px; }
.hero-actions{ display:flex; align-items:center; gap:26px; flex-wrap:wrap; margin-bottom:56px; }
.hero-link{ font-family:var(--mono); font-size:.85rem; font-weight:600; text-transform:uppercase; letter-spacing:.04em; color:var(--white); border-bottom:1px solid var(--line-on-dark); padding-bottom:3px; }
.hero-link:hover{ color:var(--amber); border-color:var(--amber); }

/* build-stack diagram */
.stack{ display:flex; flex-direction:column; gap:3px; padding-bottom:8px; }
.stack-layer{
  display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding:15px 20px; border-radius:2px; font-family:var(--mono); font-size:.78rem; letter-spacing:.03em;
  transform:translateX(0); transition:transform .25s ease;
  border-left:3px solid transparent;
}
.stack-layer:hover{ transform:translateX(10px); }
.stack-layer b{ font-family:var(--body); font-weight:600; font-size:.92rem; letter-spacing:0; text-transform:none; }
.stack-layer span.tag{ opacity:.65; text-transform:uppercase; }
.stack-layer.l1{ background:#3E7A63; border-left-color:var(--amber); width:100%; }
.stack-layer.l2{ background:#356B58; width:94%; }
.stack-layer.l3{ background:#2C5C4C; width:88%; }
.stack-layer.l4{ background:#264F41; width:82%; }
.stack-layer.l5{ background:#213F35; width:76%; }
.stack-caption{ font-family:var(--mono); font-size:.72rem; color:rgba(255,255,255,0.45); letter-spacing:.06em; text-transform:uppercase; margin-top:14px; }

.hero-stats{ border-top:1px solid var(--line-on-dark); margin-top:20px; }
.hero-stats-row{ max-width:var(--container); margin:0 auto; padding:26px 28px; display:grid; grid-template-columns:repeat(4,1fr); gap:20px; }
.hero-stat b{ display:block; font-family:var(--display); font-size:1.9rem; font-weight:800; color:var(--amber); line-height:1; margin-bottom:4px; }
.hero-stat span{ font-family:var(--mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.06em; color:rgba(255,255,255,0.6); }

@media (max-width:900px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero-stats-row{ grid-template-columns:repeat(2,1fr); }
}

/* page header (interior pages) */
.page-header{ background:var(--ink); color:var(--white); padding:64px 0 56px; background-size:cover; background-position:center; }
.breadcrumb{ font-family:var(--mono); font-size:.78rem; color:rgba(255,255,255,0.5); text-transform:uppercase; letter-spacing:.05em; margin-bottom:18px; }
.breadcrumb a{ color:rgba(255,255,255,0.75); }
.page-header h1{ color:var(--white); margin-bottom:14px; }

/* ==========================================================================
   MEDIA SPLIT
   ========================================================================== */
.media-split{ display:grid; grid-template-columns:.9fr 1.1fr; gap:60px; align-items:center; }
.media-split.reverse{ grid-template-columns:1.1fr .9fr; }
.media-split.reverse .split-photo{ order:2; }
.split-photo{ aspect-ratio:4/5; background-size:cover; background-position:center; border-radius:2px; position:relative; }
.split-photo::after{ content:''; position:absolute; inset:0; border:1px solid var(--line); }
@media (max-width:860px){
  .media-split, .media-split.reverse{ grid-template-columns:1fr; }
  .media-split.reverse .split-photo{ order:0; }
  .split-photo{ aspect-ratio:16/9; }
}

/* ==========================================================================
   PRODUCT / SERVICE CARDS
   ========================================================================== */
.card-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:26px; }
@media (max-width:960px){ .card-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:640px){ .card-grid{ grid-template-columns:1fr; } }

.product-card{ background:var(--white); border:1px solid var(--line); display:flex; flex-direction:column; }
.product-photo{ aspect-ratio:4/3; background-size:cover; background-position:center; position:relative; }
.product-cat{ position:absolute; top:14px; left:14px; background:var(--ink); color:var(--white); font-family:var(--mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.06em; padding:5px 10px; }
.product-body{ padding:22px 22px 24px; display:flex; flex-direction:column; flex:1; }
.product-body h3{ margin-bottom:8px; }
.product-body p{ color:var(--ink-70); font-size:.94rem; margin-bottom:16px; }
.spec-strip{ display:flex; border-top:1px solid var(--line); margin-top:auto; padding-top:14px; gap:18px; }
.spec{ font-family:var(--mono); }
.spec b{ display:block; font-size:.98rem; color:var(--patina); }
.spec span{ font-size:.66rem; text-transform:uppercase; letter-spacing:.05em; color:var(--ink-50); }
.product-foot{ display:flex; justify-content:space-between; align-items:center; margin-top:18px; }
.product-price{ font-family:var(--mono); font-weight:600; font-size:1rem; }
.product-price small{ font-weight:400; color:var(--ink-50); font-size:.7rem; text-transform:uppercase; margin-left:4px; }

/* filter bar */
.filter-bar{ display:flex; flex-wrap:wrap; gap:10px; margin-bottom:44px; }
.filter-btn{
  font-family:var(--mono); font-size:.78rem; text-transform:uppercase; letter-spacing:.04em;
  padding:9px 16px; border:1px solid var(--line); background:transparent; cursor:pointer; color:var(--ink-70);
  transition:.15s;
}
.filter-btn:hover{ border-color:var(--patina); color:var(--patina); }
.filter-btn.active{ background:var(--ink); color:var(--white); border-color:var(--ink); }

/* ==========================================================================
   ENERGY BAND
   ========================================================================== */
.energy-band{ background-size:cover; background-position:center; border-radius:2px; padding:64px; display:grid; grid-template-columns:1fr; }
.energy-band-copy{ max-width:560px; }
.energy-band-copy h2{ color:var(--white); }
@media (max-width:640px){ .energy-band{ padding:36px 24px; } }

/* ==========================================================================
   PROCESS STRIP (build-stack pattern reused, not numbered-badge default)
   ========================================================================== */
.process-strip{ display:grid; grid-template-columns:repeat(4,1fr); gap:2px; background:var(--line); border:1px solid var(--line); }
.process-step{ background:var(--white); padding:32px 26px; }
.process-step .idx{ font-family:var(--mono); font-size:.72rem; color:var(--patina); letter-spacing:.06em; margin-bottom:14px; display:block; }
.process-step h3{ margin-bottom:8px; font-size:1.08rem; }
.process-step p{ color:var(--ink-70); font-size:.92rem; margin:0; }
@media (max-width:860px){ .process-strip{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .process-strip{ grid-template-columns:1fr; } }

/* ==========================================================================
   STATS / VALUES
   ========================================================================== */
.value-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:26px; }
@media (max-width:900px){ .value-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .value-grid{ grid-template-columns:1fr; } }
.value-card{ border-top:3px solid var(--patina); padding-top:18px; }
.value-card h3{ font-size:1.05rem; margin-bottom:8px; }
.value-card p{ font-size:.92rem; color:var(--ink-70); margin:0; }

/* ==========================================================================
   TIMELINE (about)
   ========================================================================== */
.timeline{ display:flex; flex-direction:column; }
.tl-row{ display:grid; grid-template-columns:110px 1fr; gap:26px; padding:26px 0; border-top:1px solid var(--line); }
.tl-row:last-child{ border-bottom:1px solid var(--line); }
.tl-year{ font-family:var(--mono); font-weight:600; color:var(--patina); font-size:1.05rem; }
.tl-body h3{ font-size:1.05rem; margin-bottom:6px; }
.tl-body p{ margin:0; color:var(--ink-70); font-size:.94rem; }
@media (max-width:600px){ .tl-row{ grid-template-columns:1fr; gap:6px; } }

/* ==========================================================================
   TEAM
   ========================================================================== */
.team-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:26px; }
@media (max-width:900px){ .team-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .team-grid{ grid-template-columns:1fr; } }
.team-card .team-photo{ aspect-ratio:1; background-size:cover; background-position:center; margin-bottom:14px; }
.team-card h3{ font-size:1rem; margin-bottom:2px; }
.team-card span{ font-family:var(--mono); font-size:.74rem; text-transform:uppercase; letter-spacing:.05em; color:var(--patina); }

/* ==========================================================================
   CLIENTS
   ========================================================================== */
.clients-strip{ display:flex; flex-wrap:wrap; gap:14px 40px; align-items:center; }
.client-mark{ font-family:var(--mono); font-size:.92rem; color:var(--ink-50); letter-spacing:.02em; }
.client-mark b{ color:var(--ink); font-weight:600; }

/* ==========================================================================
   TESTIMONIALS
   ========================================================================== */
.testimonial-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:26px; }
@media (max-width:860px){ .testimonial-grid{ grid-template-columns:1fr; } }
.testimonial{ background:rgba(255,255,255,0.04); border:1px solid var(--line-on-dark); padding:28px; }
.stars{ color:var(--amber); letter-spacing:2px; margin-bottom:14px; }
.testimonial p{ color:rgba(255,255,255,0.85); font-size:.98rem; }
.testimonial-who b{ display:block; font-size:.94rem; }
.testimonial-who span{ font-family:var(--mono); font-size:.74rem; color:rgba(255,255,255,0.5); text-transform:uppercase; letter-spacing:.04em; }

/* ==========================================================================
   QUOTE / CONTACT FORM
   ========================================================================== */
.quote-panel{ background:var(--ink); color:var(--white); border-radius:2px; padding:56px; display:grid; grid-template-columns:.85fr 1.15fr; gap:56px; }
.quote-side-list{ margin-top:22px; display:flex; flex-direction:column; gap:10px; }
.quote-side-list li{ font-size:.92rem; color:rgba(255,255,255,0.75); padding-left:20px; position:relative; }
.quote-side-list li::before{ content:'—'; position:absolute; left:0; color:var(--amber); }
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.field.full{ grid-column:1/-1; }
.field label{ display:block; font-family:var(--mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.05em; color:rgba(255,255,255,0.6); margin-bottom:8px; }
.field input, .field select, .field textarea{
  width:100%; background:rgba(255,255,255,0.06); border:1px solid var(--line-on-dark); color:var(--white);
  padding:13px 14px; font-family:var(--body); font-size:.94rem; border-radius:2px;
}
.field select option{ color:var(--ink); }
.field input::placeholder, .field textarea::placeholder{ color:rgba(255,255,255,0.35); }
.field input:focus, .field select:focus, .field textarea:focus{ border-color:var(--amber); outline:none; }
.field textarea{ min-height:110px; resize:vertical; }
.form-note{ font-size:.76rem; color:rgba(255,255,255,0.45); margin-top:14px; }
.form-success{ display:none; background:rgba(79,143,118,0.18); border:1px solid var(--patina); color:#BFE3D3; padding:16px 18px; font-size:.92rem; margin-bottom:18px; border-radius:2px; }
.form-success.show{ display:block; }
@media (max-width:900px){ .quote-panel{ grid-template-columns:1fr; padding:32px 22px; } .form-grid{ grid-template-columns:1fr; } }

/* ==========================================================================
   CONTACT PAGE — info cards + map band
   ========================================================================== */
.contact-info-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:26px; margin-bottom:64px; }
@media (max-width:860px){ .contact-info-grid{ grid-template-columns:1fr; } }
.contact-info-card{ border:1px solid var(--line); padding:28px; background:var(--white); }
.contact-info-card .eyebrow{ margin-bottom:16px; }
.contact-info-card p{ margin:0 0 4px; font-size:.95rem; }
.contact-info-card a{ color:var(--patina); font-weight:600; }

.map-frame{ border:1px solid var(--line); overflow:hidden; }
.map-frame iframe{ width:100%; height:420px; border:0; display:block; filter:grayscale(.3) contrast(1.05); }

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-item{ border-top:1px solid var(--line); padding:22px 0; }
.faq-item:last-child{ border-bottom:1px solid var(--line); }
.faq-item summary{ cursor:pointer; font-family:var(--body); font-weight:600; font-size:1.02rem; list-style:none; display:flex; justify-content:space-between; align-items:center; gap:20px; }
.faq-item summary::-webkit-details-marker{ display:none; }
.faq-item summary::after{ content:'+'; font-family:var(--mono); font-size:1.3rem; color:var(--patina); flex-shrink:0; transition:transform .2s; }
.faq-item[open] summary::after{ content:'–'; }
.faq-item p{ margin-top:14px; color:var(--ink-70); font-size:.94rem; max-width:64ch; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer{ background:var(--ink); color:rgba(255,255,255,0.72); padding:72px 0 0; }
.footer-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1.2fr; gap:40px; padding-bottom:48px; border-bottom:1px solid var(--line-on-dark); }
.footer-logo{ font-family:var(--display); font-weight:900; font-size:1.5rem; color:var(--white); margin-bottom:14px; }
.footer-logo span{ color:var(--amber); }
.site-footer h4{ font-family:var(--mono); font-size:.76rem; text-transform:uppercase; letter-spacing:.07em; color:rgba(255,255,255,0.5); margin-bottom:16px; font-weight:600; }
.site-footer ul{ display:flex; flex-direction:column; gap:10px; }
.site-footer ul li a, .site-footer ul li{ font-size:.9rem; }
.site-footer ul li a:hover{ color:var(--amber); }
.footer-bottom{ display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; padding:24px 0; font-family:var(--mono); font-size:.75rem; color:rgba(255,255,255,0.4); }
@media (max-width:860px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .footer-grid{ grid-template-columns:1fr; } }

/* ==========================================================================
   MISC UTILITIES
   ========================================================================== */
.tag{ display:inline-block; font-family:var(--mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.06em; color:var(--patina); border:1px solid var(--patina); padding:3px 9px; margin-bottom:12px; }
.center-cta{ text-align:center; }
.reveal{ opacity:0; transform:translateY(18px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:translateY(0); }
@media (prefers-reduced-motion: reduce){
  .reveal{ opacity:1; transform:none; transition:none; }
  html{ scroll-behavior:auto; }
}