:root {
  --ink: #071018;
  --ink-2: #102033;
  --paper: #f6f3ec;
  --paper-2: #fffdf8;
  --line: rgba(18, 28, 40, 0.1);
  --text: #1b2430;
  --muted: #5d6874;
  --brass: #b8956a;
  --brass-2: #e6d3b1;
  --white: #f7f4ee;
  --header: 78px;
  --shadow: 0 18px 50px rgba(7, 16, 24, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: #fff;
  padding: 8px 12px;
  z-index: 20;
}
.skip:focus { top: 12px; }

.wrap {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 28px;
  background: rgba(7, 16, 24, 0.94);
  backdrop-filter: blur(12px);
  color: var(--white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 180px;
}
.logo-mark {
  width: 58px;
  height: 58px;
  object-fit: contain;
  flex: none;
}
.logo strong { display: block; font-size: 16px; font-weight: 600; letter-spacing: 0.08em; }
.logo small { display: block; color: var(--brass-2); letter-spacing: 0.18em; font-size: 10px; }

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav a {
  color: rgba(247, 244, 238, 0.82);
  font-size: 15px;
  letter-spacing: 0.04em;
}
.nav a:hover, .nav a[aria-current="page"] { color: #fff; }
.nav a[aria-current="page"] { box-shadow: inset 0 -1px 0 var(--brass); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--brass);
  background: var(--brass);
  color: #1c140c;
  letter-spacing: 0.06em;
  cursor: pointer;
}
.btn:hover { background: #c9a87a; }
.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.08); color: #fff; }
.menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: transparent;
  color: #fff;
  border-radius: 8px;
  font-size: 20px;
  line-height: 1;
}

.hero {
  position: relative;
  min-height: calc(100vh - var(--header));
  background: var(--ink);
  color: #fff;
  overflow: hidden;
}
.slide-art {
  position: absolute;
  inset: 0;
  background-position: center;
  background-size: cover;
  opacity: 0;
  transition: opacity 0.6s ease;
}
.slide-art.is-active { opacity: 1; }
.slide-art::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7, 16, 24, 0.82) 0%, rgba(7, 16, 24, 0.45) 48%, rgba(7, 16, 24, 0.2) 100%);
}
.art-port { background-image: url("../img/hero-oil-port.jpg"); }
.art-tanks { background-image: url("../img/hero-oil-tanks.jpg"); }
.art-tanker { background-image: url("../img/hero-oil-tanker.jpg"); }
.slide-copy {
  position: relative;
  z-index: 1;
  width: min(680px, calc(100% - 48px));
  margin-left: max(28px, calc((100% - 1120px) / 2));
  padding-top: 18vh;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--brass-2);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-size: 12px;
}
.slide-copy h1, .page-hero h1, .section h2, .block h2 {
  font-weight: 560;
  letter-spacing: 0.04em;
  line-height: 1.25;
}
.slide-copy h1 { margin: 0 0 16px; font-size: clamp(36px, 5vw, 64px); }
.slide-copy p { margin: 0 0 28px; max-width: 34em; color: rgba(255, 255, 255, 0.82); font-size: 18px; }
.hero-ctrl {
  position: absolute;
  z-index: 2;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 0;
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  cursor: pointer;
}
.hero-ctrl:hover { background: rgba(255, 255, 255, 0.28); }
.hero-ctrl.prev { left: 18px; }
.hero-ctrl.next { right: 18px; }
.dots {
  position: absolute;
  z-index: 2;
  left: 0;
  right: 0;
  bottom: 28px;
  display: flex;
  justify-content: center;
  gap: 10px;
}
.dots button {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 0;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
}
.dots button[aria-selected="true"] { background: var(--brass-2); }

.welcome {
  background: var(--ink);
  color: #fff;
  text-align: center;
  padding: 72px 20px 64px;
}
.welcome h2 {
  margin: 0 0 14px;
  letter-spacing: 0.16em;
  font-weight: 500;
  font-size: clamp(22px, 3vw, 32px);
}
.welcome p { margin: 0 auto; max-width: 760px; color: rgba(255, 255, 255, 0.75); }

.section { padding: 88px 0; }
.section-head { margin-bottom: 36px; }
.section-head h2, .block h2 { margin: 0 0 10px; font-size: clamp(28px, 3vw, 36px); }
.section-head p, .lead { color: var(--muted); margin: 0; }
.kicker {
  margin: 0 0 8px;
  color: var(--brass);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 12px;
}

.split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}
.tags { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.tag {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 18px 16px;
  box-shadow: var(--shadow);
}
.tag b { display: block; font-size: 18px; letter-spacing: 0.06em; }
.tag span { color: var(--muted); font-size: 13px; letter-spacing: 0.08em; }

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 28px 26px 24px;
}
.card .num {
  margin: 0;
  color: var(--brass);
  font-size: 28px;
  letter-spacing: 0.08em;
}
.card h3 { margin: 8px 0; font-size: 22px; font-weight: 600; }
.card p { margin: 0 0 16px; color: var(--muted); }
.more { color: #8a6a3d; letter-spacing: 0.08em; font-size: 14px; }
.more:hover { color: #5e4524; }

.steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.step {
  background: var(--ink);
  color: #fff;
  padding: 22px 16px;
  min-height: 180px;
}
.step b { display: block; color: var(--brass-2); letter-spacing: 0.12em; font-size: 13px; }
.step h3 { margin: 10px 0; font-size: 18px; }
.step p { margin: 0; color: rgba(255, 255, 255, 0.72); font-size: 14px; }

.reasons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.reason {
  padding: 8px 8px 0 0;
}
.reason h3 { margin: 0 0 8px; font-size: 20px; }
.reason p { margin: 0; color: var(--muted); }

.cta {
  background:
    linear-gradient(100deg, rgba(7, 16, 24, 0.92), rgba(16, 32, 51, 0.78)),
    url("../img/hero-oil-tanker.jpg") center/cover;
  color: #fff;
  padding: 72px 0;
}
.cta h2 { margin: 0 0 10px; font-size: clamp(28px, 3vw, 40px); }
.cta p { margin: 0 0 22px; max-width: 640px; color: rgba(255, 255, 255, 0.78); }

.page-hero {
  background:
    linear-gradient(90deg, rgba(7, 16, 24, 0.88), rgba(7, 16, 24, 0.45)),
    url("../img/hero-oil-tanks.jpg") center/cover;
  color: #fff;
  padding: 72px 0 64px;
}
.page-hero h1 { margin: 0 0 8px; font-size: clamp(32px, 4vw, 52px); }
.page-hero p { margin: 0; max-width: 640px; color: rgba(255, 255, 255, 0.78); }

.prose { max-width: 760px; }
.prose p { margin: 0 0 16px; }
.panel {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 28px;
}
.service-block {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}
.service-block .num { margin: 0; color: var(--brass); font-size: 32px; }
.service-block h2 { margin: 0 0 8px; font-size: 28px; }
.service-block p { margin: 0; color: var(--muted); }

.form {
  display: grid;
  gap: 16px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
label { display: grid; gap: 6px; font-size: 14px; }
input, select, textarea {
  width: 100%;
  border: 1px solid rgba(18, 28, 40, 0.16);
  background: #fff;
  padding: 12px 12px;
  color: var(--text);
}
textarea { min-height: 140px; resize: vertical; }
.hp { position: absolute; left: -9999px; }
.note {
  padding: 12px 14px;
  background: #eef6f1;
  border: 1px solid #cfe3d6;
  color: #1d4a32;
}
.note.err { background: #fbf1f1; border-color: #efd0d0; color: #7a2e2e; }
.contact-side { color: var(--muted); }
.contact-side strong { color: var(--text); }
.contact-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(260px, 0.95fr);
  gap: 24px;
  align-items: stretch;
}
.contact-details { max-width: none; height: 100%; }
.contact-details p:last-child { margin-bottom: 0; }
.enquiry-form { max-width: 760px; }
.map-wrap { margin: 0; display: flex; flex-direction: column; min-height: 100%; }
.map-frame { height: 280px; flex: 1; border: 1px solid var(--line); background: #e7eef2; }
.map-note { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.site-footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.75);
  padding: 48px 0 28px;
}
.foot {
  display: flex;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.foot nav { display: flex; gap: 18px; flex-wrap: wrap; }
.foot a:hover { color: #fff; }
.legal { margin: 18px 0 0; font-size: 13px; color: rgba(255, 255, 255, 0.5); }

@media (max-width: 900px) {
  .menu-btn { display: grid; place-items: center; }
  .nav {
    display: none;
    position: absolute;
    top: var(--header);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 20px 16px;
    background: #071018;
  }
  .nav.open { display: flex; }
  .nav a, .nav .btn { width: 100%; padding: 12px 0; }
  .split, .cards, .reasons, .form-row, .service-block, .contact-layout { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .slide-copy { padding-top: 12vh; }
  .foot { flex-direction: column; }
  .site-header .btn-nav { display: none; }
}