html {
  scroll-behavior: smooth;
}

:root {
  --bg: #0a0d12;
  --bg-deep: #05070a;
  --bg-panel: #13181f;
  --bg-panel-hi: #1b2230;
  --border: #282f3c;
  --border-hi: #3a4356;
  --text: #eef0f5;
  --text-dim: #a4abbb;
  --text-mute: #6b7488;

  /* yellow-amber primary — refinery flare */
  --accent: #f0a730;
  --accent-hi: #ffcc4e;
  --accent-deep: #8c5510;
  --flame: #ffd666;

  /* signal colours */
  --warn: #ffcc4e;
  --coastal: #8ab4d8;
  --offshore: #6592c4;
  --town: #b5d18a;
  --feedback: #e56ab5;
  --steel: #8691a7;

  --radius: 3px;
  --radius-lg: 6px;
  --fs-base: 16px;

  --font-display: "Big Shoulders Display", "Oswald", "Impact", sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -5%, rgba(240, 167, 48, 0.07), transparent 60%),
    linear-gradient(180deg, var(--bg), var(--bg-deep));
  background-attachment: fixed;
}

a { color: var(--accent-hi); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--flame); }

code {
  font-family: var(--font-mono);
  background: var(--bg-panel-hi);
  color: var(--accent-hi);
  padding: 0.1em 0.4em;
  border-radius: var(--radius);
  font-size: 0.88em;
  border: 1px solid var(--border);
}

pre {
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.1em 1.3em;
  overflow-x: auto;
  line-height: 1.55;
  font-size: 0.9rem;
}
pre code { background: transparent; padding: 0; border: none; color: var(--text); }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.05;
  color: var(--text);
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* ============== HERO ============== */
.hero {
  padding: 7rem 0 6rem;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(ellipse 70% 50% at 85% 15%, rgba(240, 167, 48, 0.2), transparent 62%),
    radial-gradient(ellipse 60% 45% at 5% 85%, rgba(240, 167, 48, 0.06), transparent 62%),
    linear-gradient(180deg, #0f141d, #0a0d12 80%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(240, 167, 48, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 167, 48, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 25%, transparent 75%);
  pointer-events: none;
}
.hero > .container { position: relative; z-index: 1; }

.hero h1 {
  font-size: clamp(3.5rem, 9vw, 6.5rem);
  font-weight: 900;
  text-transform: uppercase;
  margin: 0.4em 0 0.3em;
  letter-spacing: -0.01em;
  line-height: 0.9;
}
.hero h1 .accent {
  color: var(--accent);
  text-shadow: 0 0 38px rgba(240, 167, 48, 0.55);
}
.hero .tag {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  background: rgba(240, 167, 48, 0.08);
  color: var(--accent-hi);
  padding: 0.45em 0.95em;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  border: 1px solid rgba(240, 167, 48, 0.3);
}
.hero .tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
.hero .lede {
  font-size: 1.22rem;
  max-width: 46em;
  color: var(--text-dim);
  margin: 0 0 2.5rem;
  font-weight: 400;
}
.cta-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.cta {
  display: inline-flex;
  align-items: center;
  padding: 0.85em 1.6em;
  border-radius: 2px;
  background: var(--accent);
  color: #1a1002;
  font-weight: 700;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--accent);
  transition: all 0.15s;
  box-shadow: 0 2px 0 var(--accent-deep);
}
.cta:hover {
  background: var(--accent-hi);
  border-color: var(--accent-hi);
  color: #1a1002;
  transform: translateY(-1px);
  box-shadow: 0 3px 0 var(--accent-deep);
}
.cta:active { transform: translateY(1px); box-shadow: 0 1px 0 var(--accent-deep); }
.cta-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-hi);
  box-shadow: none;
}
.cta-ghost:hover {
  background: var(--bg-panel);
  color: var(--accent-hi);
  border-color: var(--accent);
  box-shadow: none;
}

/* ============== SECTIONS ==============
   Use .container here (not `main section`) to beat the
   class-vs-element specificity of the shared .container rule. */
main section.container {
  padding-top: 6rem;
  padding-bottom: 5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}
main section.container:last-of-type { border-bottom: none; }

h2 {
  font-size: clamp(2.2rem, 4.5vw, 3rem);
  font-weight: 700;
  text-transform: uppercase;
  margin: 0 0 1.5rem;
  padding-bottom: 0.7rem;
  position: relative;
}
h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 3rem;
  height: 3px;
  background: var(--accent);
}
h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.5em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
p {
  margin: 0 0 1rem;
  color: var(--text-dim);
  font-size: 1.02rem;
}
p strong, p em { color: var(--text); }
.note { color: var(--text-mute); font-size: 0.95rem; font-style: italic; }

/* ============== TIERS ============== */
.tiers { display: flex; flex-direction: column; gap: 1.25rem; margin-top: 1.75rem; }
.tier {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  position: relative;
}
.tier-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.1rem;
}
.tier-header h3 {
  margin: 0;
  font-size: 1.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text);
}
.tier-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.4rem;
  height: 2.4rem;
  padding: 0 0.55em;
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}
.tier-num::before {
  content: "TIER ";
  font-size: 0.65rem;
  opacity: 0.75;
  margin-right: 0.3em;
}
.industry-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.6rem;
}
.industry-grid li {
  background: var(--bg-panel-hi);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.94rem;
  transition: border-color 0.15s, background 0.15s;
}
.industry-grid li:hover {
  border-color: var(--border-hi);
  background: #1f2634;
}
.industry-grid li strong {
  color: var(--text);
  font-size: 1rem;
  font-weight: 600;
}
.industry-grid li span {
  color: var(--text-dim);
  font-size: 0.9rem;
}
.industry-grid li .coastal,
.industry-grid li .offshore,
.industry-grid li .town,
.industry-grid li .warn {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.18em 0.55em;
  border-radius: 2px;
  background: rgba(0,0,0,0.35);
  margin-top: 0.05rem;
}
.industry-grid li .coastal  { color: var(--coastal);  border: 1px solid rgba(138,180,216,0.35); }
.industry-grid li .offshore { color: var(--offshore); border: 1px solid rgba(101,146,196,0.4); }
.industry-grid li .town     { color: var(--town);     border: 1px solid rgba(181,209,138,0.35); }
.industry-grid li .warn     { color: var(--warn);     border: 1px solid rgba(255,204,78,0.35); }

/* chip-shaped anchors that jump to a feature card (e.g. "gated", "requires fluid") */
.industry-grid li a.chip-link {
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}
.industry-grid li a.chip-link:hover,
.industry-grid li a.chip-link:focus {
  background: rgba(255,204,78,0.12);
  border-color: rgba(255,204,78,0.6);
  outline: none;
}

/* ============== CARGO CHIPS & FILTER ==============
   Colours grouped by tier so cargos produced in the same tier share a hue family:
   Tier 1 = earth browns + anomaly blue for water
   Tier 2 = gold / yellow / olive
   Tier 3 = green
   Tier 4 = blue / purple / pink
   Tier 5 = warm orange
*/

/* Palette normalised to ~L 62-72 in HSL so every chip reads with similar
   contrast against the dark background; hue families group cargos by tier. */

/* Tier 1 — extraction (earth tones) */
.chip[data-cargo="crude-oil"]             { --c: #c28566; --c-text: #1a0e08; }
.chip[data-cargo="raw-gas"]               { --c: #ccb28e; --c-text: #1a1308; }
.chip[data-cargo="coal"]                  { --c: #9a8e80; --c-text: #120e08; }
.chip[data-cargo="treated-water"]         { --c: #92aec0; --c-text: #081220; }
.chip[data-cargo="condensate"]            { --c: #dcb878; --c-text: #1a1208; }
.chip[data-cargo="passengers"]            { --c: #b8b0d8; --c-text: #120e1f; }

/* Tier 2 — primary processing (gold / yellow / olive) */
.chip[data-cargo="light-oil"]             { --c: #e8dc52; --c-text: #1a1408; }
.chip[data-cargo="heavy-oil"]             { --c: #c7a565; --c-text: #1a1208; }
.chip[data-cargo="naphtha"]               { --c: #bcd064; --c-text: #0f1808; }
.chip[data-cargo="refinery-gas"]          { --c: #c9bf72; --c-text: #1a1808; }
.chip[data-cargo="lng"]                   { --c: #d9d18c; --c-text: #1a1808; }
.chip[data-cargo="lpg"]                   { --c: #c9a855; --c-text: #1a1208; }
.chip[data-cargo="sulphur"]               { --c: #ecd832; --c-text: #1a1808; }
.chip[data-cargo="coke"]                  { --c: #ad9e8f; --c-text: #120e08; }
.chip[data-cargo="coal-tar"]              { --c: #c29144; --c-text: #1a0e08; }

/* Tier 3 — petrochemistry (green) */
.chip[data-cargo="ethylene"]              { --c: #a2cd62; --c-text: #0a1c0a; }
.chip[data-cargo="chemicals"]             { --c: #65ab81; --c-text: #081a0c; }
.chip[data-cargo="fracking-fluid"]        { --c: #7bcb66; --c-text: #0a1c0a; }

/* Tier 4 — processing & production (blue / purple / pink) */
.chip[data-cargo="lubricants"]            { --c: #82a3d6; --c-text: #080f1e; }
.chip[data-cargo="bitumen"]               { --c: #7785c7; --c-text: #080f1e; }
.chip[data-cargo="plastics"]              { --c: #d499e1; --c-text: #200c20; }
.chip[data-cargo="fertiliser"]            { --c: #80b4cc; --c-text: #081220; }
.chip[data-cargo="petroleum-fuels"]       { --c: #7298d1; --c-text: #080f1e; }
.chip[data-cargo="engineering-supplies"]  { --c: #8782cb; --c-text: #100c20; }

/* Tier 5 — exports (warm orange) */
.chip[data-cargo="food"]                  { --c: #e4a578; --c-text: #1a0e08; }

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.22em 0.65em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: lowercase;
  border-radius: 2px;
  border: 1px solid var(--c, var(--border));
  line-height: 1.3;
  white-space: nowrap;
}
/* Default chip style = outline (transparent bg, --c border + text) */
.chip.in,
.chip.out {
  background: transparent;
  color: var(--c);
}
/* Selected = filled */
.chip.selected {
  background: var(--c);
  color: var(--c-text);
}

/* IN/OUT small-caps badge prefix inside each cargo chip.
   Outline chip: badge uses cargo colour as bg.
   Selected (filled) chip: badge inverts — bg becomes the contrast text colour. */
.chip.in::before,
.chip.out::before {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  font-variant: small-caps;
  letter-spacing: 0.04em;
  line-height: 1;
  margin-right: 0.55em;
  padding: 0.02em 0.4em;
  border-radius: 1px;
  background: var(--c);
  color: var(--c-text);
}
.chip.in::before  { content: "in"; }
.chip.out::before { content: "out"; }

.chip.selected::before {
  background: var(--c-text);
  color: var(--c);
}

.industry-flow {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.4rem;
}
.industry-flow .chip[data-cargo] {
  cursor: pointer;
  transition: opacity 0.12s, box-shadow 0.12s;
}
.industry-flow .chip[data-cargo]:hover {
  box-shadow: 0 0 0 1px var(--c);
}
.flow-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}
.flow-divider {
  width: 100%;
  height: 1px;
  background: var(--border-hi);
  opacity: 0.5;
  margin: 0.1rem 0;
}
.industry-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.industry-grid li.industry {
  gap: 0.35rem;
  transition: opacity 0.2s ease, border-color 0.15s, background 0.15s, box-shadow 0.15s;
}
.industry-grid li.industry.dim { opacity: 0.2; }
.industry-grid li.industry.highlight {
  border-color: var(--accent);
  background: #232937;
  box-shadow: 0 0 0 1px rgba(240, 167, 48, 0.4);
}

/* Filter bar */
.cargo-filter {
  margin: 1.75rem 0 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.cargo-filter-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
}
.cargo-filter-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}
.cargo-filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.chip.filter {
  cursor: pointer;
  background: transparent;
  color: var(--c);
  border-color: var(--c);
  padding: 0.3em 0.75em;
  transition: all 0.12s;
}
.chip.filter::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--c);
  margin-right: 0.45em;
  opacity: 0.6;
}
.chip.filter.selected {
  background: var(--c);
  color: var(--c-text);
  box-shadow: 0 0 0 1px var(--c);
}
.chip.filter.selected::before { opacity: 1; }
.chip.filter:hover { opacity: 0.85; }
.filter-reset {
  background: transparent;
  border: 1px solid var(--border-hi);
  color: var(--text-dim);
  padding: 0.4em 0.9em;
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, opacity 0.15s;
}
.filter-reset:hover:not(:disabled) { color: var(--accent-hi); border-color: var(--accent); }
.filter-reset:disabled {
  cursor: not-allowed;
  opacity: 0.35;
  color: var(--text-mute);
}

.feedback-pill {
  display: inline-block;
  background: rgba(229, 106, 181, 0.1);
  color: var(--feedback);
  padding: 0.1em 0.65em;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.82em;
  border: 1px solid rgba(229, 106, 181, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============== CARDS (features) ============== */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1.75rem;
}
.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.5rem 1.7rem;
}
.card h3 {
  color: var(--accent-hi);
  margin-bottom: 0.7em;
}
.card:target {
  border-color: var(--warn);
  box-shadow: 0 0 0 1px rgba(255,204,78,0.35), 0 0 24px rgba(255,204,78,0.15);
  animation: card-target-pulse 1.2s ease 1;
}
@keyframes card-target-pulse {
  0%   { box-shadow: 0 0 0 3px rgba(255,204,78,0.55), 0 0 32px rgba(255,204,78,0.3); }
  100% { box-shadow: 0 0 0 1px rgba(255,204,78,0.35), 0 0 24px rgba(255,204,78,0.15); }
}

/* ============== CARGOS ============== */
.cargo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.6rem;
  margin: 1.75rem 0 1.25rem;
}
.cargo-grid > div {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.95rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  position: relative;
  overflow: hidden;
}
.cargo-grid > div::before {
  content: "";
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: var(--steel);
  opacity: 0.7;
}
.cargo-grid strong {
  color: var(--text);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-size: 0.95rem;
}
.cargo-grid span {
  color: var(--text-dim);
  font-size: 0.82rem;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* ============== STEPS ============== */
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1.75rem 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.steps > li {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.7rem 1.5rem 4.75rem;
  position: relative;
  counter-increment: step;
}
.steps > li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 1.5rem;
  top: 1.35rem;
  width: 2.3rem;
  height: 2.3rem;
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.steps h3 {
  margin-top: 0;
  color: var(--text);
}
.steps p { margin-bottom: 0.75rem; }
.steps pre { margin: 0.75rem 0 0; }

/* ============== FOOTER ============== */
footer {
  padding: 2.75rem 0;
  border-top: 1px solid var(--border);
  color: var(--text-mute);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ============== RESPONSIVE ============== */
@media (max-width: 600px) {
  .hero { padding: 4.5rem 0 3.5rem; }
  .hero h1 { font-size: 3rem; }
  main section.container { padding-top: 4rem; padding-bottom: 3rem; }
  .steps > li { padding-left: 1.5rem; padding-top: 3.9rem; }
  .steps > li::before { top: 1rem; left: 1.25rem; }
  .tier { padding: 1.25rem 1.35rem; }
}