/* ==========================================================================
   CONTINENTAL PETROLEUM OPERATING LTD
   Stylesheet — editorial/industrial system (navy + rust, serif + grotesk)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,500;0,9..144,600;0,9..144,700;1,9..144,400;1,9..144,500&family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:wght@400;500;600;700&display=swap');

:root{
  --ink:        #0d2032;
  --ink-2:      #123049;
  --ink-soft:   rgba(13,32,50,.68);
  --ink-faint:  rgba(13,32,50,.42);
  --paper:      #f6f1e6;
  --paper-2:    #ede4cf;
  --white:      #fffdf7;
  --rust:       #bd6a2f;
  --rust-dark:  #954f21;
  --rust-soft:  rgba(189,106,47,.14);
  --steel:      #4a7078;
  --line:       rgba(13,32,50,.14);
  --line-soft:  rgba(13,32,50,.08);
  --line-invert:rgba(255,253,247,.18);

  --font-display: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --font-body: 'IBM Plex Sans', 'Segoe UI', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --container: 1180px;
  --gutter: clamp(20px, 4vw, 48px);
}

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -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,h5,p{ margin:0; }
button{ font: inherit; cursor:pointer; background:none; border:0; color:inherit; }
::selection{ background: var(--rust); color: var(--white); }

.wrap{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--rust-dark);
  margin: 0 0 16px;
}
.eyebrow::before{
  content:"";
  width: 26px; height: 1px;
  background: var(--rust);
  display:inline-block;
  vertical-align:middle;
  margin-right:.7em;
}

.icon{ width:1em; height:1em; fill:none; stroke:currentColor; stroke-width:1.5; stroke-linecap:round; stroke-linejoin:round; flex-shrink:0; }

/* ---------- Type ---------- */
h1,h2,h3{ font-family: var(--font-display); font-weight:500; line-height:1.12; letter-spacing:-.01em; }
.section-heading{
  font-size: clamp(28px, 3.4vw, 40px);
  max-width: 22ch;
}
.lede{ font-size: 19px; color: var(--ink-soft); max-width: 62ch; }
p + p{ margin-top: 1.1em; }

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header{ position: sticky; top:0; z-index: 60; }

.topbar{
  background: var(--ink);
  color: rgba(255,253,247,.82);
}
.topbar-inner{
  display:flex; flex-wrap:wrap; gap: 10px 28px;
  justify-content:flex-end;
  padding: 9px var(--gutter);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing:.02em;
}
.topbar-item{ display:flex; align-items:center; gap:8px; overflow-wrap:anywhere; }
.topbar-item .icon{ color: var(--rust); font-size:13px; }
.topbar a:hover{ color: var(--white); }

.navbar{
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s ease;
}
.site-header.is-scrolled .navbar{ box-shadow: 0 8px 24px -14px rgba(13,32,50,.35); }

.navbar-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding: 14px var(--gutter);
  gap: 24px;
}
.brand{ display:inline-flex; align-items:center; padding: 8px 16px; }
.brand img{ height: 65px; width:auto; }

.nav-toggle{
  display:none;
  flex-direction:column; justify-content:center; gap:5px;
  width: 34px; height: 30px;
  padding:0;
}
.nav-toggle span{ display:block; height:2px; width:100%; background: var(--ink); transition: transform .2s ease, opacity .2s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

.primary-nav ul{ display:flex; align-items:center; gap: 2px; }
.primary-nav > ul > li{ position:relative; }
.primary-nav a{
  display:flex; align-items:center; gap:6px;
  padding: 10px 16px;
  font-size: 13.5px; font-weight:600;
  letter-spacing:.05em; text-transform:uppercase;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}
.primary-nav > ul > li > a:hover,
.primary-nav > ul > li > a.current{ color: var(--ink); border-color: var(--rust); }
.primary-nav .icon{ width:11px; height:11px; margin-top:1px; }

.sub-nav{
  position:absolute; top: calc(100% + 1px); left:0;
  min-width: 250px;
  background: var(--ink);
  padding: 8px;
  opacity:0; visibility:hidden; transform: translateY(6px);
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
  box-shadow: 0 18px 34px -16px rgba(13,32,50,.5);
}
.has-sub:hover .sub-nav,
.has-sub.is-open .sub-nav{ opacity:1; visibility:visible; transform:none; }
.sub-nav a{ color: rgba(255,253,247,.78); padding: 11px 14px; border-bottom:0; text-transform:none; letter-spacing:.01em; font-size:14px; }
.sub-nav a:hover{ color: var(--white); background: rgba(255,253,247,.06); }

/* ==========================================================================
   HERO (home)
   ========================================================================== */
.hero{ position:relative; overflow:hidden; background: var(--ink); }
.hero-slide{
  position:relative; height: min(84vh, 780px); min-height: 480px;
  background-size: cover; background-position:center;
  display:none;
}
.hero-slide.is-active{ display:block; animation: fade .9s ease; }
@keyframes fade{ from{ opacity:0; } to{ opacity:1; } }
.hero-slide-scrim{
  position:absolute; inset:0;
  background:
    linear-gradient(0deg, rgba(13,20,28,.86) 0%, rgba(13,20,28,.42) 46%, rgba(13,20,28,.55) 100%);
}
.hero-content{ position:relative; height:100%; display:flex; flex-direction:column; justify-content:flex-end; padding-bottom: 92px; color: var(--white); }
.hero-content .eyebrow{ color: #e3a875; }
.hero-content .eyebrow::before{ background: #e3a875; }
.hero h1{ font-size: clamp(38px, 6vw, 68px); max-width: 16ch; font-weight:500; }
.hero-excerpt{ margin-top:18px; font-size:18px; max-width:44ch; color: rgba(255,253,247,.82); }

.hero-controls{
  position:absolute; left:0; right:0; bottom: 26px;
  display:flex; align-items:center; gap:22px;
}
.hero-arrow{ width:42px; height:42px; border:1px solid var(--line-invert); border-radius:50%; display:flex; align-items:center; justify-content:center; color: var(--white); transition: background .2s; }
.hero-arrow:hover{ background: rgba(255,253,247,.12); }
.hero-dots{ display:flex; gap:9px; }
.hero-dot{ width:26px; height:3px; background: rgba(255,253,247,.32); transition: background .2s; }
.hero-dot.is-active{ background: var(--rust); }

/* ==========================================================================
   INTRO NUMBERED LIST
   ========================================================================== */
.intro{ padding: 68px 0 8px; }
.intro-list{ display:grid; grid-template-columns: repeat(3, 1fr); border-top:1px solid var(--line); }
.intro-list li{ display:flex; gap:18px; padding: 34px 26px 34px 0; border-right:1px solid var(--line); }
.intro-list li:last-child{ border-right:0; }
.intro-list .num{ font-family: var(--font-mono); color: var(--rust); font-size:13px; padding-top:3px; }
.intro-list h3{ font-size:17px; font-family: var(--font-body); font-weight:700; letter-spacing:.03em; text-transform:uppercase; margin-bottom:8px; }
.intro-list p{ color: var(--ink-soft); font-size:15px; }

/* ==========================================================================
   ABOUT SPLIT (home)
   ========================================================================== */
.about-split{ padding: 84px 0; }
.grid-split{ display:grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items:start; }
.about-split h2{ font-size: clamp(26px, 3vw, 34px); }
.about-copy p{ color: var(--ink-soft); }
.about-copy .lede{ color: var(--ink); }

/* ==========================================================================
   STATS BAND
   ========================================================================== */
.stats{ background: var(--ink); color: var(--white); padding: 60px 0; }
.stats-grid{ display:grid; grid-template-columns: repeat(4, 1fr); }
.stat{ text-align:center; border-left:1px solid var(--line-invert); padding: 0 18px; }
.stat:first-child{ border-left:0; }
.stat-num{ display:block; font-family: var(--font-display); font-size: clamp(34px,4vw,52px); color: #e3a875; }
.stat-label{ display:block; margin-top:8px; font-family: var(--font-mono); font-size:12.5px; letter-spacing:.08em; text-transform:uppercase; color: rgba(255,253,247,.7); }

/* ==========================================================================
   INFO BAND (call / visit / email)
   ========================================================================== */
.info-band{ padding: 58px 0; background: var(--paper-2); }
.info-grid{ display:grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
.info-item{ display:flex; gap:16px; align-items:flex-start; }
.info-item .icon-badge{
  width:46px; height:46px; flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  background: var(--ink); color: #e3a875;
  font-size:19px;
}
.info-item h4{ font-family: var(--font-mono); font-size:12.5px; letter-spacing:.09em; text-transform:uppercase; color: var(--rust-dark); margin-bottom:6px; }
.info-item p{ color: var(--ink-soft); font-size:15px; }
.info-item a:hover{ color: var(--rust-dark); }

/* ==========================================================================
   PAGE BANNER (interior pages)
   ========================================================================== */
.page-banner{
  position:relative; color: var(--white);
  padding: 74px 0 52px;
  overflow:hidden;
  background: linear-gradient(100deg, var(--ink) 20%, rgba(13,32,50,.55) 100%);
}
.page-banner::before{
  content:""; position:absolute; inset:0;
  background-image: url('../images/banner-page.jpg');
  background-size:cover; background-position:center;
  opacity:.22;
}
.page-banner .wrap{ position:relative; z-index:1; }
.crumbs{ font-family: var(--font-mono); font-size:12.5px; letter-spacing:.06em; text-transform:uppercase; color: rgba(255,253,247,.62); margin-bottom:14px; }
.crumbs a:hover{ color: var(--white); }
.crumbs .sep{ margin:0 8px; color: rgba(255,253,247,.35); }
.page-banner h1{ font-size: clamp(30px, 4vw, 46px); }

/* ==========================================================================
   GENERIC CONTENT SECTIONS
   ========================================================================== */
.section{ padding: 78px 0; }
.section-tight{ padding: 56px 0; }
.copy-block{ max-width: 74ch; }
.copy-block p{ color: var(--ink-soft); }
.copy-block .section-heading{ color: var(--ink); margin-bottom: 26px; }

/* Numbered editorial blocks (About-us: Logistics/Consulting, Sustainability pillars) */
.stack{ margin-top: 54px; border-top:1px solid var(--line); }
.stack-item{ display:grid; grid-template-columns: 120px 1fr; gap: 24px; padding: 42px 0; border-bottom:1px solid var(--line); }
.stack-item .num{ font-family: var(--font-display); font-size: 30px; color: var(--rust); }
.stack-item h3{ font-size: clamp(20px, 2.4vw, 26px); margin-bottom: 14px; font-weight:500; }
.stack-item p{ color: var(--ink-soft); }
.stack-item p + p{ margin-top:1em; }

/* Two column: sidebar + content (services / contact) */
.split-layout{ display:grid; grid-template-columns: 300px 1fr; gap: 56px; align-items:start; }
.split-layout.reverse{ grid-template-columns: 1fr 300px; }
.split-layout.reverse .sidebar{ order:2; }

.sidebar{ position:sticky; top: 118px; display:flex; flex-direction:column; gap:26px; }
.split-layout > .sidebar:only-child{ grid-column: 1 / -1; max-width: 420px; }
.widget{ background: var(--white); border:1px solid var(--line); padding: 26px; }
.widget-title{ font-family: var(--font-mono); font-size:12.5px; letter-spacing:.09em; text-transform:uppercase; color: var(--rust-dark); margin-bottom:18px; }

.category-nav li + li{ border-top:1px solid var(--line-soft); }
.category-nav a{ display:flex; align-items:center; justify-content:space-between; padding: 13px 2px; font-weight:600; font-size:14.5px; color: var(--ink-soft); }
.category-nav a::after{ content:"→"; opacity:0; transform: translateX(-4px); transition: all .15s ease; color: var(--rust); }
.category-nav li.is-current a,
.category-nav a:hover{ color: var(--ink); }
.category-nav li.is-current a::after,
.category-nav a:hover::after{ opacity:1; transform:none; }

.contact-list li{ display:flex; gap:12px; padding: 12px 0; align-items:flex-start; }
.contact-list li + li{ border-top:1px solid var(--line-soft); }
.contact-list .icon{ color: var(--rust); margin-top:3px; }
.contact-list span{ color: var(--ink-soft); font-size:14.5px; line-height:1.5; }

.single-page .section-heading{ margin-bottom:22px; }
.single-page p{ color: var(--ink-soft); }

.bull{ margin: 28px 0; border-left: 2px solid var(--rust-soft); }
.bull li{ padding: 12px 0 12px 22px; color: var(--ink-soft); font-size:15px; position:relative; }
.bull li::before{ content:""; position:absolute; left:-3px; top:22px; width:5px; height:5px; background: var(--rust); }

/* Accordion (marketing FAQ) */
.accordion{ margin-top: 34px; border-top:1px solid var(--line); }
.accordion-item{ border-bottom:1px solid var(--line); }
.accordion-trigger{
  width:100%; display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding: 22px 2px; text-align:left;
  font-family: var(--font-display); font-size:19px; color: var(--ink);
}
.accordion-trigger .icon{ transition: transform .2s ease; color: var(--rust); flex-shrink:0; }
.accordion-item.is-open .accordion-trigger .icon{ transform: rotate(45deg); }
.accordion-panel{ max-height:0; overflow:hidden; transition: max-height .28s ease; }
.accordion-item.is-open .accordion-panel{ max-height: 480px; }
.accordion-body{ padding: 0 2px 24px; color: var(--ink-soft); font-size:15px; }

/* Product rows (products.html) */
.product-rows{ margin-top: 56px; display:flex; flex-direction:column; gap: 6px; }
.product-row{ display:grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items:center; padding: 46px 0; border-top:1px solid var(--line); }
.product-row:last-child{ border-bottom:1px solid var(--line); }
.product-row:nth-child(even) .product-media{ order:2; }
.product-media{ position:relative; aspect-ratio: 4/3; overflow:hidden; }
.product-media img{ width:100%; height:100%; object-fit:cover; }
.product-media::after{ content:""; position:absolute; inset:0; box-shadow: inset 0 0 0 1px rgba(13,32,50,.08); }
.product-index{ font-family: var(--font-mono); color: var(--rust); font-size:13px; letter-spacing:.1em; }
.product-row h3{ font-size: clamp(21px, 2.4vw, 27px); margin: 10px 0 16px; font-weight:500; }
.product-row p{ color: var(--ink-soft); font-size:15px; }
.product-row p + p{ margin-top: .9em; }

/* Contact page */
.contact-note{ font-family: var(--font-display); font-size: clamp(20px, 2.4vw, 26px); font-weight:400; color: var(--ink); max-width: 30ch; }
.map-frame{ margin-top: 34px; border:1px solid var(--line); background: var(--paper-2); height: 360px; }
.map-frame iframe{ width:100%; height:100%; border:0; filter: grayscale(.15) contrast(1.02); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer{ background: var(--ink); color: rgba(255,253,247,.72); }
.footer-grid{ display:grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 40px; padding: 72px 0 48px; }
.footer-brand img{ height:80px; margin-bottom:20px; padding:10px 16px; }
.footer-brand p{ font-size:14.5px; color: rgba(255,253,247,.56); max-width:34ch; }
.footer-title{ font-family: var(--font-mono); font-size:12px; letter-spacing:.09em; text-transform:uppercase; color: #e3a875; margin-bottom:20px; }
.footer-col ul li + li{ margin-top:11px; }
.footer-col a{ font-size:14.5px; color: rgba(255,253,247,.66); }
.footer-col a:hover{ color: var(--white); }
.footer-bottom{ border-top:1px solid var(--line-invert); padding: 22px 0; }
.footer-bottom .wrap{ display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between; font-size:13px; font-family: var(--font-mono); color: rgba(255,253,247,.5); }

/* ==========================================================================
   BACK TO TOP
   ========================================================================== */
.to-top{
  position:fixed; right: 22px; bottom: 22px; z-index:70;
  width:46px; height:46px;
  background: var(--ink); color: var(--white);
  display:flex; align-items:center; justify-content:center;
  opacity:0; visibility:hidden; transform: translateY(10px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.to-top.is-visible{ opacity:1; visibility:visible; transform:none; }
.to-top:hover{ background: var(--rust-dark); }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 980px){
  .grid-split{ grid-template-columns:1fr; gap:28px; }
  .split-layout,
  .split-layout.reverse{ grid-template-columns:1fr; }
  .split-layout .sidebar,
  .split-layout.reverse .sidebar{ order:-1; position:static; flex-direction:row; flex-wrap:wrap; }
  .split-layout .sidebar .widget{ flex:1 1 260px; }
  .product-row{ grid-template-columns:1fr; gap:22px; }
  .product-row:nth-child(even) .product-media{ order:0; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px){
  .nav-toggle{ display:flex; }
  .primary-nav{
    position:fixed; inset: 0 0 0 auto; width: min(340px, 84vw);
    background: var(--ink); padding: 100px 28px 40px;
    transform: translateX(100%); transition: transform .28s ease;
    overflow-y:auto;
  }
  .primary-nav.is-open{ transform:none; }
  .primary-nav ul{ flex-direction:column; align-items:stretch; gap:0; }
  .primary-nav a{ color: rgba(255,253,247,.85); padding: 15px 4px; border-bottom:1px solid var(--line-invert); }
  .primary-nav > ul > li > a.current{ color: var(--white); }
  .sub-nav{ position:static; opacity:1; visibility:visible; transform:none; box-shadow:none; padding-left:14px; display:none; }
  .has-sub.is-open .sub-nav{ display:block; }
  .sub-nav a{ color: rgba(255,253,247,.6); border-bottom:1px solid rgba(255,253,247,.08); }
  .topbar-inner{ justify-content:center; }
  .intro-list{ grid-template-columns:1fr; }
  .intro-list li{ border-right:0; border-bottom:1px solid var(--line); }
  .intro-list li:last-child{ border-bottom:0; }
  .stats-grid{ grid-template-columns: 1fr 1fr; row-gap:36px; }
  .stat:nth-child(3){ border-left:0; }
  .info-grid{ grid-template-columns:1fr; gap:30px; }
}

@media (max-width: 600px){
  .footer-grid{ grid-template-columns:1fr; padding-top:52px; }
  .stack-item{ grid-template-columns: 1fr; }
  .hero-content{ padding-bottom:64px; }
  .topbar-inner{ font-size:11px; gap:6px 18px; }
  .topbar-item{ text-align:center; }
}