/* ── Reset & Base ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:   #0a1628;
  --ink:    #111827;
  --blue:   #1a56db;
  --blue-l: #3b82f6;
  --amber:  #d97706;
  --amber-l:#fbbf24;
  --green:  #15803d;
  --red:    #b91c1c;
  --cream:  #fdf8f0;
  --warm:   #f5f0e8;
  --border: rgba(0,0,0,0.10);
  --border-l: rgba(255,255,255,0.10);
  --mono: 'IBM Plex Mono', monospace;
  --serif: 'Source Serif 4', Georgia, serif;
  --display: 'Playfair Display', Georgia, serif;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--serif);
  background: var(--cream);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ── NAV ──────────────────────────────────────────────────────────── */
#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10,22,40,0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-l);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 2rem;
  display: flex; align-items: center; height: 56px; gap: 2rem;
}
.nav-logo {
  font-family: var(--mono); font-size: 13px; font-weight: 600;
  color: var(--blue-l); letter-spacing: 0.02em; white-space: nowrap;
}
.nav-links {
  display: flex; gap: 0; margin-left: auto;
}
.nav-links a {
  font-family: var(--mono); font-size: 11.5px; font-weight: 500;
  color: rgba(255,255,255,0.65); text-decoration: none;
  padding: 0 14px; height: 56px; display: flex; align-items: center;
  border-left: 1px solid rgba(255,255,255,0.06);
  transition: color var(--transition), background var(--transition);
  letter-spacing: 0.03em;
}
.nav-links a:hover { color: #fff; background: rgba(255,255,255,0.06); }
.nav-burger { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-burger span { display: block; width: 22px; height: 1.5px; background: #fff; margin: 5px 0; transition: var(--transition); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-burger { display: block; margin-left: auto; }
}

/* ── HERO ─────────────────────────────────────────────────────────── */
#hero {
  min-height: 100vh;
  background: var(--navy);
  display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding-top: 56px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
}
#hero-canvas { width: 100%; height: 100%; opacity: 0.12; }

.hero-grid {
  position: relative; z-index: 1;
  max-width: 900px; margin: 0 auto; padding: 5rem 2rem 4rem;
}
.hero-tag {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  color: var(--blue-l); letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 1.5rem; opacity: 0; animation: fadeUp 0.8s 0.1s forwards;
}
.hero-title {
  display: flex; flex-direction: column; gap: 0.5rem;
  margin-bottom: 2rem;
}
.hero-eq {
  font-family: var(--mono); font-size: clamp(1.6rem, 5vw, 3.8rem);
  font-weight: 600; color: #fff; line-height: 1.1;
  letter-spacing: -0.02em;
  opacity: 0; animation: fadeUp 0.8s 0.2s forwards;
}
.hero-subtitle {
  font-family: var(--display); font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 400; color: rgba(255,255,255,0.5); font-style: italic;
  opacity: 0; animation: fadeUp 0.8s 0.3s forwards;
}
.hero-desc {
  font-family: var(--serif); font-size: 1.1rem; color: rgba(255,255,255,0.65);
  line-height: 1.8; max-width: 680px; margin-bottom: 2.5rem;
  opacity: 0; animation: fadeUp 0.8s 0.4s forwards;
}
.hero-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px; background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.08); border-radius: 4px;
  margin-bottom: 2.5rem;
  opacity: 0; animation: fadeUp 0.8s 0.5s forwards;
}
.stat {
  background: rgba(10,22,40,0.8); padding: 1.25rem 1rem;
  display: flex; flex-direction: column; gap: 4px;
}
.stat-val {
  font-family: var(--mono); font-size: 1.6rem; font-weight: 600;
  color: var(--blue-l); line-height: 1;
}
.stat-label { font-family: var(--mono); font-size: 10.5px; color: rgba(255,255,255,0.45); letter-spacing: 0.04em; }

.hero-cta {
  display: inline-block;
  font-family: var(--mono); font-size: 13px; font-weight: 500;
  color: var(--blue-l); text-decoration: none; letter-spacing: 0.06em;
  border-bottom: 1px solid var(--blue); padding-bottom: 2px;
  opacity: 0; animation: fadeUp 0.8s 0.6s forwards;
  transition: color var(--transition);
}
.hero-cta:hover { color: #fff; border-color: #fff; }

/* ── SECTIONS ─────────────────────────────────────────────────────── */
.section { padding: 6rem 0; }
.section-dark { background: var(--navy); color: #fff; }
.section-inner { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

.section-tag {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--blue);
  margin-bottom: 0.75rem;
}
.section-dark .section-tag { color: var(--blue-l); }

.section-title {
  font-family: var(--display); font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700; line-height: 1.2; margin-bottom: 2.5rem;
  color: var(--ink);
}
.section-dark .section-title { color: #fff; }
.section-lead {
  font-size: 1.1rem; color: rgba(255,255,255,0.65); max-width: 680px;
  margin-bottom: 2.5rem; line-height: 1.7;
}

/* ── EQUATION DISPLAY ─────────────────────────────────────────────── */
.eq-display { margin-bottom: 3rem; }
.eq-main {
  font-family: var(--mono); font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  font-weight: 600; color: var(--navy);
  background: var(--warm); border-left: 4px solid var(--blue);
  padding: 1.5rem 2rem; margin-bottom: 2rem;
  letter-spacing: -0.01em;
}
.eq-terms {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
  gap: 1px; background: var(--border-l);
  border: 1px solid var(--border-l);
}
.term {
  background: rgba(255,255,255,0.04); padding: 1.25rem;
  transition: background var(--transition);
}
.term:hover { background: rgba(255,255,255,0.08); }
.term-sym {
  font-family: var(--mono); font-size: 2rem; font-weight: 600;
  color: var(--amber-l); line-height: 1; margin-bottom: 0.5rem;
}
.term-name {
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: rgba(255,255,255,0.7); margin-bottom: 0.5rem;
}
.term-desc { font-size: 0.875rem; color: rgba(255,255,255,0.5); line-height: 1.6; }

/* Insights strip */
.insight-strip {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr));
  gap: 1px; background: var(--border-l); border: 1px solid var(--border-l);
}
.insight { background: rgba(255,255,255,0.04); padding: 1.5rem; color: #fff; }
.insight-icon {
  font-family: var(--mono); font-size: 13px; font-weight: 600;
  color: var(--blue-l); margin-bottom: 0.5rem;
}
.insight-text { font-size: 0.875rem; color: rgba(255,255,255,0.6); line-height: 1.6; }

/* ── PIPELINE GRID ────────────────────────────────────────────────── */
.pipeline-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem; margin-bottom: 2rem;
}
.pipeline-card {
  background: #fff; border: 1px solid var(--border);
  padding: 1.25rem; border-radius: 2px;
  cursor: pointer; transition: all var(--transition);
  position: relative;
}
.pipeline-card.active {
  border-color: var(--blue);
  box-shadow: 0 0 0 1px var(--blue);
}
.pipeline-card.red-sea.active {
  border-color: var(--amber);
  box-shadow: 0 0 0 1px var(--amber);
}
.pipeline-card.omani.active {
  border-color: var(--green);
  box-shadow: 0 0 0 1px #22c55e;
}
.pipeline-card .pc-toggle {
  position: absolute; top: 1rem; right: 1rem;
  width: 20px; height: 20px; border-radius: 3px;
  border: 2px solid #ccc; display: flex; align-items: center; justify-content: center;
  font-size: 14px; color: transparent; transition: all var(--transition);
}
.pipeline-card.active .pc-toggle {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}
.pipeline-card.red-sea.active .pc-toggle {
  border-color: var(--amber);
  background: var(--amber);
}
.pipeline-card.omani.active .pc-toggle {
  border-color: var(--green);
  background: var(--green);
}
.pc-name {
  font-family: var(--mono); font-size: 13px; font-weight: 700;
  color: var(--ink); margin-bottom: 0.4rem; padding-right: 2rem;
}
.pc-cap {
  font-family: var(--mono); font-size: 11px; color: var(--blue);
  margin-bottom: 0.3rem;
}
.pc-meta {
  font-size: 0.8rem; color: #888; line-height: 1.5;
}
.pc-route {
  display: inline-block; font-family: var(--mono); font-size: 10px;
  padding: 2px 6px; border-radius: 2px; margin-top: 0.5rem;
  font-weight: 600; letter-spacing: 0.04em;
}
.pc-route.rs {
  background: rgba(251,191,36,0.12); color: var(--amber);
  border: 1px solid rgba(251,191,36,0.3);
}
.pc-route.om {
  background: rgba(34,197,94,0.12); color: var(--green);
  border: 1px solid rgba(34,197,94,0.3);
}
.pc-route.go {
  background: rgba(59,130,246,0.12); color: var(--blue-l);
  border: 1px solid rgba(59,130,246,0.3);
}

.pipeline-summary {
  background: var(--navy); padding: 1.5rem; border-radius: 2px;
  border: 1px solid rgba(255,255,255,0.1);
}
.ps-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.06);
  font-family: var(--mono); font-size: 13px;
}
.ps-row:last-child { border-bottom: none; }
.ps-label { color: rgba(255,255,255,0.55); }
.ps-val { color: #fff; font-weight: 600; }
.ps-val.highlight { color: var(--blue-l); font-size: 1.1rem; }
.ps-val.warn { color: var(--amber-l); }

/* ── SIMULATOR ────────────────────────────────────────────────────── */
.sim-layout { display: grid; grid-template-columns: 340px 1fr; gap: 2rem; margin-bottom: 2rem; }
@media (max-width: 900px) { .sim-layout { grid-template-columns: 1fr; } }

.sim-controls { display: flex; flex-direction: column; gap: 1.25rem; }
.sim-param label { display: block; font-family: var(--mono); font-size: 10.5px; font-weight: 600; letter-spacing: 0.05em; color: rgba(255,255,255,0.55); text-transform: uppercase; margin-bottom: 6px; }
.sim-param { display: flex; flex-direction: column; }
input[type=range] {
  flex: 1; -webkit-appearance: none; height: 3px;
  background: rgba(255,255,255,0.15); border-radius: 2px; outline: none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px;
  border-radius: 50%; background: var(--blue-l); cursor: pointer;
  border: 2px solid var(--navy);
}
input[type=range]:disabled {
  opacity: 0.4;
}
input[type=range]:disabled::-webkit-slider-thumb {
  background: #666;
}
.sim-val { font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--blue-l); min-width: 36px; text-align: right; }

.sim-eq-display {
  font-family: var(--mono); font-size: 13px; font-weight: 600;
  color: var(--blue-l); background: rgba(255,255,255,0.05);
  padding: 1rem 1.25rem; border-left: 3px solid var(--blue);
  margin-bottom: 1.25rem; border-radius: 0 4px 4px 0;
  word-break: break-all; line-height: 1.5;
}

.sim-metrics {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 8px; margin-bottom: 1.25rem;
}
.sim-met {
  background: rgba(255,255,255,0.05); padding: 0.75rem;
  border-radius: 2px; border: 1px solid rgba(255,255,255,0.08);
}
.sm-label { font-family: var(--mono); font-size: 10px; color: rgba(255,255,255,0.45); margin-bottom: 4px; letter-spacing: 0.04em; }
.sm-val { font-family: var(--mono); font-size: 1.1rem; font-weight: 700; color: #fff; }
.sm-val.accent { color: var(--blue-l); }
.sm-val.red { color: #f87171; }
.sm-val.green { color: #86efac; }
.sm-val.amber { color: #fde68a; }

.sim-verdict {
  padding: 0.875rem 1rem; border-radius: 2px; font-size: 0.84rem; line-height: 1.6;
  border-left: 3px solid var(--blue); background: rgba(59,130,246,0.08); color: rgba(255,255,255,0.75);
  font-family: var(--serif);
}

.sim-chart-wrap { position: relative; height: 260px; margin-bottom: 0.75rem; }
.sim-legend { display: flex; flex-wrap: wrap; gap: 1rem; font-family: var(--mono); font-size: 11px; color: rgba(255,255,255,0.55); margin-top: 0.5rem; }
.sim-legend span { display: flex; align-items: center; gap: 6px; }
.leg-sq { width: 16px; height: 3px; border-radius: 2px; display: inline-block; }

/* ── SCENARIOS ────────────────────────────────────────────────────── */
.scenario-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}
.scenario-card {
  background: #fff; border: 1px solid var(--border);
  padding: 1.5rem; border-radius: 2px;
  cursor: pointer; transition: all var(--transition);
}
.scenario-card:hover {
  border-color: var(--blue);
  box-shadow: 0 2px 12px rgba(26,86,219,0.08);
}
.scenario-card.active {
  border-color: var(--blue);
  background: rgba(59,130,246,0.04);
}
.sc-label {
  font-family: var(--mono); font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--blue); margin-bottom: 0.5rem;
}
.sc-title {
  font-family: var(--display); font-size: 1.1rem; font-weight: 700;
  color: var(--ink); margin-bottom: 0.75rem;
}
.sc-m {
  font-family: var(--mono); font-size: 1.5rem; font-weight: 700;
  color: var(--blue); margin-bottom: 0.25rem;
}
.sc-detail {
  font-size: 0.85rem; color: #666; line-height: 1.6;
}
.sc-bar {
  margin-top: 0.75rem; height: 6px; background: #f0ece4;
  border-radius: 3px; overflow: hidden;
}
.sc-bar-fill {
  height: 100%; background: var(--blue); border-radius: 3px;
  transition: width 0.5s;
}
.sc-bar-fill.warn { background: var(--amber); }
.sc-bar-fill.good { background: var(--green); }

/* ── ANALYSIS ─────────────────────────────────────────────────────── */
.analysis-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px; background: var(--border-l); margin-bottom: 2rem;
}
.analysis-card {
  background: rgba(255,255,255,0.04); padding: 1.5rem;
}
.ac-num {
  font-family: var(--mono); font-size: 2rem; font-weight: 700;
  color: rgba(59,130,246,0.3); line-height: 1; margin-bottom: 0.75rem;
}
.analysis-card h3 {
  font-family: var(--display); font-size: 1rem; font-weight: 700;
  color: #fff; margin-bottom: 0.75rem;
}
.analysis-card p {
  font-size: 0.875rem; color: rgba(255,255,255,0.55); line-height: 1.7;
}

/* ── FOOTER ───────────────────────────────────────────────────────── */
footer { background: var(--navy); border-top: 1px solid rgba(255,255,255,0.08); padding: 3rem 2rem; }
.footer-inner { max-width: 1100px; margin: 0 auto; display: flex; align-items: center; flex-wrap: wrap; gap: 1.5rem; }
.footer-eq { font-family: var(--mono); font-size: 1.1rem; font-weight: 600; color: var(--blue-l); }
.footer-meta { font-family: var(--mono); font-size: 11px; color: rgba(255,255,255,0.35); letter-spacing: 0.06em; }
.footer-links { margin-left: auto; }
.footer-links a { font-family: var(--mono); font-size: 11px; color: rgba(255,255,255,0.45); text-decoration: none; letter-spacing: 0.06em; }
.footer-links a:hover { color: #fff; }

/* ── ANIMATIONS ───────────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── RESPONSIVE ───────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .eq-main { font-size: 1.2rem; padding: 1rem; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .sim-metrics { grid-template-columns: 1fr 1fr; }
  .pipeline-grid { grid-template-columns: 1fr; }
  .scenario-grid { grid-template-columns: 1fr; }
}