/* ============================================================
   BITUMEN NETWORK (PVT) LTD — DESIGN SYSTEM
   Palette:   Asphalt navy #14213D / Hazard yellow #F4B400 /
              Brand red #D8342B / Steel #5C6B73 / Concrete white #EEF0EF
   Type:      Oswald (display, condensed/signage) + Inter (body) +
              IBM Plex Mono (specs & grade codes)
   Signature: "drum label" tag cards + dashed lane-marker dividers
   ============================================================ */

:root{
  --navy:        #14213D;
  --navy-deep:   #0D1626;
  --yellow:      #F4B400;
  --yellow-deep: #C8930A;
  --red:         #D8342B;
  --steel:       #5C6B73;
  --steel-light: #8A97A0;
  --concrete:    #EEF0EF;
  --concrete-2:  #E2E5E3;
  --white:       #FFFFFF;
  --ink:         #14171A;

  --font-display: 'Oswald', sans-serif;
  --font-body:    'Inter', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  --radius: 2px;
  --container: 1200px;
  --bg: none;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--concrete);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
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(--font-display);
  text-transform:uppercase;
  letter-spacing:.02em;
  line-height:1.15;
  margin:0 0 .5em;
  color:var(--navy);
}
p{ margin:0 0 1em; color:#33393E; }
.container{ max-width:var(--container); margin:0 auto; padding:0 28px; }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible{
  outline:3px solid var(--yellow); outline-offset:2px;
}
@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; scroll-behavior:auto !important; }
}

/* ---------- eyebrow / kicker ---------- */
.eyebrow{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--font-mono); font-size:.72rem; font-weight:600;
  letter-spacing:.18em; text-transform:uppercase; color:var(--red);
  margin-bottom:14px;
}
.eyebrow::before{
  content:""; width:26px; height:3px; background:var(--yellow); display:block;
}

/* ---------- dashed lane-marker divider (signature element) ---------- */
.lane-divider{
  height:6px;
  background-image:repeating-linear-gradient(90deg, var(--yellow) 0 34px, transparent 34px 58px);
  opacity:.9;
}
.lane-divider.dark{
  background-image:repeating-linear-gradient(90deg, var(--concrete) 0 34px, transparent 34px 58px);
  opacity:.25;
}

/* ============================================================
   HEADER / NAV
   ============================================================ */
.topbar{
  background:var(--navy-deep); color:var(--concrete-2);
  font-family:var(--font-mono); font-size:.75rem;
}
.topbar .container{
  display:flex; justify-content:space-between; align-items:center;
  padding-top:8px; padding-bottom:8px; flex-wrap:wrap; gap:6px;
}
.topbar a{ color:var(--concrete-2); }
.topbar .topbar-links{ display:flex; gap:22px; }

.site-header{
  background:var(--navy);
  position:sticky; top:0; z-index:50;
  box-shadow:0 2px 0 var(--yellow);
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  padding-top:14px; padding-bottom:14px;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand-logo{
  width:190px;
  height:auto;
  display:block;
}
.site-header .brand-logo{
  width:230px;
  height:auto;
  max-height:64px;
}
.site-footer .brand-logo{ width:170px; filter:brightness(0) invert(1); }
.main-nav ul{ display:flex; gap:2px; }
.main-nav a{
  font-family:var(--font-display); font-size:.85rem; letter-spacing:.06em;
  text-transform:uppercase; color:var(--concrete-2); padding:10px 16px;
  border-bottom:3px solid transparent; transition:border-color .15s, color .15s;
}
.main-nav a:hover, .main-nav a.active{ color:var(--yellow); border-color:var(--yellow); }
.nav-cta{
  background:var(--red); color:var(--white) !important; border-radius:2px;
  padding:10px 18px !important; margin-left:8px;
}
.nav-cta:hover{ background:#B82920; border-color:transparent !important; color:var(--white) !important; }

.nav-toggle{ display:none; background:none; border:2px solid var(--concrete-2); color:var(--concrete-2); padding:8px 10px; font-size:1.1rem; border-radius:2px; }

@media (max-width: 960px){
  .main-nav{
    position:absolute; top:100%; left:0; right:0; background:var(--navy);
    flex-direction:column; display:none; border-top:1px solid rgba(255,255,255,.1);
    padding:8px 0 16px;
  }
  .main-nav.open{ display:flex; }
  .main-nav ul{ flex-direction:column; width:100%; }
  .main-nav li{ width:100%; }
  .main-nav a{
    display:block;
    width:100%;
    padding:11px 28px;
    border-bottom:1px solid rgba(255,255,255,.08);
    border-left:4px solid transparent;
  }
  .main-nav a:hover,.main-nav a.active{
    border-left-color:var(--yellow);
    border-bottom-color:rgba(255,255,255,.08);
  }
  .main-nav .nav-cta{
    display:block;
    width:calc(100% - 56px);
    margin:12px 28px 0;
    text-align:center;
    border-left:none;
    border-bottom:none;
  }
  .nav-toggle{ display:block; }
  .topbar .topbar-links{ display:none; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  position:relative; color:var(--white); overflow:hidden;
  min-height:560px; display:flex; align-items:flex-end;
  background-color:var(--navy-deep);
  background-image:linear-gradient(180deg, rgba(13,22,38,.55), rgba(13,22,38,.92)), var(--bg);
  background-size:cover; background-position:center;
  clip-path:polygon(0 0,100% 0,100% 92%,0 100%);
}
.hero-inner{ padding:120px 0 90px; position:relative; z-index:2; max-width:760px; }
.hero .eyebrow{ color:var(--yellow); }
.hero .eyebrow::before{ background:var(--red); }
.hero h1{ color:var(--white); font-size:clamp(2.1rem,4.6vw,3.4rem); margin-bottom:.4em; }
.hero p.lead{ color:var(--concrete-2); font-size:1.08rem; max-width:560px; }
.hero-ctas{ display:flex; gap:16px; margin-top:28px; flex-wrap:wrap; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-display); text-transform:uppercase; letter-spacing:.06em;
  font-size:.85rem; padding:14px 26px; border-radius:2px; border:2px solid transparent;
  cursor:pointer; transition:transform .12s, background .15s, color .15s, border-color .15s;
}
.btn:hover{ transform:translateY(-1px); }
.btn-primary{ background:var(--yellow); color:var(--navy-deep); }
.btn-primary:hover{ background:var(--yellow-deep); }
.btn-outline{ border-color:var(--concrete-2); color:var(--white); }
.btn-outline:hover{ background:rgba(255,255,255,.08); }
.btn-dark{ background:var(--navy); color:var(--white); }
.btn-dark:hover{ background:var(--navy-deep); }

/* stat strip under hero */
.stat-strip{ background:var(--yellow); }
.stat-strip .container{
  display:grid; grid-template-columns:repeat(4,1fr); gap:0;
}
.stat{
  padding:20px 22px; border-left:1px solid rgba(20,33,61,.18);
  font-family:var(--font-mono);
}
.stat:first-child{ border-left:none; }
.stat b{ display:block; font-family:var(--font-display); font-size:1.6rem; color:var(--navy-deep); }
.stat span{ font-size:.72rem; letter-spacing:.04em; color:var(--navy); text-transform:uppercase; }
@media (max-width:800px){ .stat-strip .container{ grid-template-columns:repeat(2,1fr); } .stat{ border-left:none; border-top:1px solid rgba(20,33,61,.18);} .stat:nth-child(odd){border-left:none;} }

/* generic inner page banner (non-home hero) */
.page-banner{
  position:relative; color:var(--white);
  background-color:var(--navy-deep);
  background-image:linear-gradient(180deg, rgba(13,22,38,.6), rgba(13,22,38,.94)), var(--bg);
  background-size:cover; background-position:center;
  padding:80px 0 56px;
  clip-path:polygon(0 0,100% 0,100% 100%,0 92%);
}
.page-banner h1{ color:var(--white); font-size:clamp(1.9rem,4vw,2.7rem); margin-bottom:.2em; }
.breadcrumb{ font-family:var(--font-mono); font-size:.75rem; color:var(--concrete-2); letter-spacing:.05em; text-transform:uppercase; }
.breadcrumb a{ color:var(--yellow); }

/* ============================================================
   SECTIONS
   ============================================================ */
.section{ padding:76px 0; }
.section.tight{ padding:56px 0; }
.section.on-navy{ background:var(--navy); color:var(--concrete-2); }
.section.on-navy h2, .section.on-navy h3{ color:var(--white); }
.section.on-navy p{ color:var(--concrete-2); }
.section.on-navy .drum-card h3{ color:var(--navy); }
.section.on-navy .drum-card p{ color:#33393E; }
.section.on-navy .drum-card .grades{ color:var(--red); }
.section.on-concrete-2{ background:var(--concrete-2); }
.section-head{ max-width:640px; margin-bottom:44px; }
.section-head h2{ font-size:clamp(1.6rem,3vw,2.2rem); }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }
.section-head.center .eyebrow::before{ display:none; }

.two-col{ display:grid; grid-template-columns:1.1fr .9fr; gap:56px; align-items:center; }
@media (max-width:880px){ .two-col{ grid-template-columns:1fr; } }

/* ---------- DRUM-LABEL CARD (signature component) ---------- */
.drum-card{
  background:var(--white); border:1px solid var(--concrete-2);
  position:relative; padding:26px 24px 24px; border-radius:2px;
  box-shadow:0 1px 0 rgba(20,33,61,.05);
  transition:transform .15s, box-shadow .15s;
}
.drum-card:hover{ transform:translateY(-3px); box-shadow:0 10px 24px rgba(20,33,61,.12); }
.drum-card::before{ /* label tab */
  content:""; position:absolute; top:0; left:24px; width:38px; height:8px;
  background:var(--yellow);
}
.drum-card .tag{
  display:inline-block; font-family:var(--font-mono); font-size:.68rem; font-weight:600;
  letter-spacing:.08em; text-transform:uppercase; color:var(--navy-deep);
  background:var(--yellow); padding:3px 9px; border-radius:2px; margin-bottom:14px;
}
.drum-card h3{ font-size:1.15rem; margin-bottom:.35em; }
.drum-card p{ font-size:.92rem; margin-bottom:.6em; }
.drum-card .grades{ font-family:var(--font-mono); font-size:.78rem; color:var(--red); font-weight:600; letter-spacing:.02em; }
.card-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.card-grid.cols-4{ grid-template-columns:repeat(4,1fr); }
.card-grid.cols-2{ grid-template-columns:repeat(2,1fr); }
@media (max-width:900px){ .card-grid, .card-grid.cols-4, .card-grid.cols-2{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:600px){ .card-grid, .card-grid.cols-4, .card-grid.cols-2{ grid-template-columns:1fr; } }

/* ---------- vision / mission red blocks ---------- */
.vm-grid{ display:grid; grid-template-columns:1fr 1fr; gap:2px; background:var(--red); }
.vm-panel{ background:var(--red); color:var(--white); padding:36px 34px; }
.vm-panel h3{ color:var(--white); font-size:1.2rem; display:flex; align-items:center; gap:12px; }
.vm-panel p{ color:rgba(255,255,255,.92); margin:0; }
@media (max-width:760px){ .vm-grid{ grid-template-columns:1fr; } }

/* ---------- numbered process steps ---------- */
.process{ display:grid; grid-template-columns:repeat(5,1fr); gap:0; position:relative; }
.process::before{
  content:""; position:absolute; top:26px; left:5%; right:5%; height:2px;
  background-image:repeating-linear-gradient(90deg,var(--steel-light) 0 10px, transparent 10px 20px);
}
.p-step{ position:relative; padding:0 16px; text-align:left; }
.p-step .num{
  width:52px; height:52px; border-radius:50%; background:var(--navy); color:var(--yellow);
  font-family:var(--font-display); font-size:1.2rem; display:flex; align-items:center; justify-content:center;
  margin-bottom:16px; position:relative; z-index:2; border:4px solid var(--concrete);
}
.p-step h4{ font-size:.95rem; margin-bottom:6px; }
.p-step p{ font-size:.85rem; }
@media (max-width:900px){ .process{ grid-template-columns:repeat(2,1fr); gap:28px; } .process::before{ display:none; } }
@media (max-width:560px){ .process{ grid-template-columns:1fr; } }

/* ---------- feature list w/ icon chip ---------- */
.feature-list{ display:grid; gap:22px; }
.feature{ display:flex; gap:16px; align-items:flex-start; }
.feature .chip{
  width:38px; height:38px; flex-shrink:0; background:var(--navy); color:var(--yellow);
  display:flex; align-items:center; justify-content:center; border-radius:2px; font-weight:700; font-family:var(--font-mono);
}
.feature h4{ font-size:1rem; margin-bottom:4px; }
.feature p{ font-size:.92rem; margin:0; }

/* ---------- image with caption tag ---------- */
.photo-frame{ position:relative; }
.photo-frame img{ width:100%; height:100%; object-fit:cover; border-radius:2px; }
.photo-frame .tagline{
  position:absolute; left:0; bottom:0; background:var(--yellow); color:var(--navy-deep);
  font-family:var(--font-mono); font-size:.72rem; letter-spacing:.05em; text-transform:uppercase;
  padding:8px 14px; font-weight:600;
}

/* ---------- application tabs (products page) ---------- */
.tabs{ display:flex; gap:6px; flex-wrap:wrap; border-bottom:2px solid var(--concrete-2); margin-bottom:36px; }
.tab-btn{
  font-family:var(--font-display); text-transform:uppercase; letter-spacing:.04em; font-size:.85rem;
  padding:12px 20px; background:none; border:none; cursor:pointer; color:var(--steel);
  border-bottom:3px solid transparent; margin-bottom:-2px;
}
.tab-btn.active, .tab-btn:hover{ color:var(--navy); border-color:var(--yellow); }
.tab-panel{ display:none; }
.tab-panel.active{ display:block; }

.spec-table{ width:100%; border-collapse:collapse; font-size:.92rem; margin-top:18px;}
.spec-table th,.spec-table td{ text-align:left; padding:12px 14px; border-bottom:1px solid var(--concrete-2); }
.spec-table th{ font-family:var(--font-display); text-transform:uppercase; font-size:.78rem; letter-spacing:.05em; color:var(--navy); background:var(--concrete-2); }
.spec-table td.code{ font-family:var(--font-mono); color:var(--red); font-weight:600; }

/* ---------- packaging note strip ---------- */
.note-strip{
  display:flex; gap:18px; align-items:center; background:var(--concrete-2);
  border-left:4px solid var(--yellow); padding:18px 22px; margin-top:20px;
}
.note-strip p{ margin:0; font-size:.92rem; }

/* ---------- testimony / quote block reused as certification callout ---------- */
.callout-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media (max-width:860px){ .callout-grid{ grid-template-columns:1fr; } }
.callout{ background:var(--white); border:1px solid var(--concrete-2); padding:28px; border-radius:2px; }
.callout .big{ font-family:var(--font-display); font-size:2.1rem; color:var(--navy); }
.callout .big span{ color:var(--red); }
.section.on-navy .callout .big,
.section.on-navy .callout .big span{ color:var(--yellow); }
.callout h4{ font-size:.95rem; margin-bottom:8px; }
.callout p{ font-size:.88rem; }

/* ---------- gallery ---------- */
.gallery-filter{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom:32px; }
.filter-btn{
  font-family:var(--font-mono); font-size:.75rem; text-transform:uppercase; letter-spacing:.06em;
  padding:8px 16px; border:1px solid var(--steel-light); border-radius:20px; background:var(--white);
  cursor:pointer; color:var(--steel);
}
.filter-btn.active,.filter-btn:hover{ background:var(--navy); color:var(--white); border-color:var(--navy); }
.masonry{
  display:grid;
  grid-template-columns:repeat(3, minmax(0, 1fr));
  gap:24px;
}
.masonry .g-item{
  margin:0;
  position:relative;
  border-radius:2px;
  overflow:hidden;
  background:var(--white);
  display:flex;
  flex-direction:column;
}
.masonry .g-item img{
  width:100%;
  height:260px;
  display:block;
  object-fit:cover;
  object-position:center;
  flex:0 0 auto;
}
.masonry .g-item figcaption{
  font-family:var(--font-mono); font-size:.7rem; letter-spacing:.04em; text-transform:uppercase;
  background:var(--navy-deep); color:var(--concrete-2); padding:8px 12px;
  min-height:38px;
  display:flex;
  align-items:center;
}
@media (max-width:900px){ .masonry{ grid-template-columns:repeat(2, minmax(0, 1fr)); } }
@media (max-width:600px){
  .masonry{ grid-template-columns:1fr; }
  .masonry .g-item img{ height:240px; }
}

/* ---------- form ---------- */
.form-grid{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.form-grid .full{ grid-column:1/-1; }
@media (max-width:760px){ .form-grid{ grid-template-columns:1fr; } }
label{ font-family:var(--font-mono); font-size:.72rem; text-transform:uppercase; letter-spacing:.06em; color:var(--navy); display:block; margin-bottom:6px; }
input,select,textarea{
  width:100%; font-family:var(--font-body); font-size:.95rem; padding:12px 14px;
  border:1px solid var(--steel-light); border-radius:2px; background:var(--white); color:var(--ink);
}
textarea{ min-height:120px; resize:vertical; }
.field{ margin-bottom:0; }
.form-card{ background:var(--white); border:1px solid var(--concrete-2); padding:34px; border-radius:2px; }
.captcha-row{
  display:grid;
  grid-template-columns:auto minmax(120px, 180px);
  gap:12px;
  align-items:center;
}
.captcha-question{
  font-family:var(--font-mono);
  font-size:.85rem;
  color:var(--navy);
  background:var(--concrete-2);
  border-left:4px solid var(--yellow);
  padding:12px 14px;
}
@media (max-width:560px){
  .captcha-row{ grid-template-columns:1fr; }
}

/* ---------- contact info list ---------- */
.info-list{ display:grid; gap:22px; }
.info-item{ display:flex; gap:16px; }
.info-item .chip{ background:var(--yellow); color:var(--navy-deep); }
.info-item h4{ font-size:.85rem; letter-spacing:.04em; margin-bottom:2px; }
.info-item p{ font-size:.95rem; margin:0; font-family:var(--font-mono); }

.map-placeholder{
  height:100%; min-height:280px; background:var(--concrete-2);
  border:1px solid var(--steel-light); overflow:hidden;
}
.map-placeholder iframe{
  width:100%;
  height:100%;
  min-height:inherit;
  border:0;
  display:block;
}

/* ---------- CTA band ---------- */
.cta-band{
  background:var(--red); color:var(--white); text-align:center; padding:64px 0;
  position:relative; overflow:hidden;
}
.cta-band h2{ color:var(--white); font-size:clamp(1.6rem,3.4vw,2.4rem); }
.cta-band p{ color:rgba(255,255,255,.9); max-width:560px; margin:0 auto 26px; }
.cta-band .btn-primary{ background:var(--white); color:var(--red); }
.cta-band .btn-primary:hover{ background:var(--concrete-2); }

/* ---------- FAQ accordion ---------- */
.faq-item{ border-bottom:1px solid var(--concrete-2); }
.faq-q{
  width:100%; text-align:left; background:none; border:none; padding:20px 0; cursor:pointer;
  display:flex; justify-content:space-between; align-items:center; gap:16px;
  font-family:var(--font-display); text-transform:uppercase; letter-spacing:.02em; font-size:1rem; color:var(--navy);
}
.faq-q .plus{ font-family:var(--font-mono); font-size:1.2rem; color:var(--red); flex-shrink:0; }
.faq-a{ max-height:0; overflow:hidden; transition:max-height .25s ease; }
.faq-a p{ padding-bottom:18px; font-size:.92rem; }
.faq-item.open .faq-a{ max-height:400px; }
.faq-item.open .faq-q .plus{ transform:rotate(45deg); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{ background:var(--navy-deep); color:var(--concrete-2); padding-top:56px; }
.footer-grid{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:36px; padding-bottom:40px; }
@media (max-width:880px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .footer-grid{ grid-template-columns:1fr; } }
.site-footer h4{ color:var(--white); font-size:.85rem; letter-spacing:.06em; margin-bottom:16px; }
.site-footer p{ color:var(--steel-light); font-size:.88rem; }
.site-footer ul li{ margin-bottom:10px; }
.site-footer a{ color:var(--concrete-2); font-size:.9rem; }
.site-footer a:hover{ color:var(--yellow); }
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1); padding:20px 0; display:flex; justify-content:space-between;
  font-size:.8rem; color:var(--steel-light); flex-wrap:wrap; gap:10px;
}

/* utility */
.mt-0{margin-top:0;}
.text-center{text-align:center;}