:root {
  --ink: #0A0E16;
  --surface: #10151F;
  --surface-2: #161C28;
  --line: #232B3A;
  --text: #E7EAF0;
  --muted: #8993A6;
  --blue: #2B6CB8;
  --teal: #1FB6A6;
  --amber: #F2A93B;
  --red: #D6553F;

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --wrap: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

a { color: inherit; }

.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }

::selection { background: var(--amber); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(231,234,240,0.028) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(231,234,240,0.028) 1px, transparent 1px);
  background-size: 48px 48px;
}

#ambientCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.35;
}

/* SCROLL REVEAL */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* HEADER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10,14,22,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 6px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
}
.brand-mark { color: var(--amber); }
.brand-sep { color: var(--line); }
.brand-name { color: var(--text); font-weight: 500; }

.nav { display: flex; align-items: center; gap: 28px; }
.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  transition: color 0.15s ease;
}
.nav a:hover { color: var(--text); }
.nav-cta {
  color: var(--ink) !important;
  background: var(--amber);
  padding: 8px 16px;
  border-radius: 3px;
  font-weight: 600;
}
.nav-cta:hover { background: #f6bc5c; color: var(--ink) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  cursor: pointer;
  padding: 0;
}
.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* HERO */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

#flowViz {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.9;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  /* Light two-axis scrim: keeps the headline column on clean ground while
     leaving the flow legible around the aerofoil on the right. */
  background:
    linear-gradient(90deg, var(--ink) 0%, rgba(10,14,22,0.97) 34%, rgba(10,14,22,0.6) 55%, rgba(10,14,22,0) 76%),
    linear-gradient(180deg, rgba(10,14,22,0.2) 0%, rgba(10,14,22,0.08) 45%, rgba(10,14,22,0.5) 90%, var(--ink) 100%);
  z-index: 1;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  padding-top: 60px;
  padding-bottom: 90px;
  max-width: 760px;
}

.eyebrow {
  color: var(--teal);
  font-size: 0.78rem;
  text-transform: uppercase;
  margin: 0 0 22px;
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 6vw, 4.5rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(90deg, var(--teal), var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 560px;
  margin: 0 0 36px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 3px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--amber); color: var(--ink); }
.btn-primary:hover { background: #f6bc5c; transform: translateY(-1px); }
.btn-ghost {
  color: var(--text);
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); }

.hero-readout {
  position: absolute;
  bottom: 22px;
  right: 28px;
  z-index: 2;
  font-size: 0.75rem;
  color: var(--teal);
  opacity: 0.8;
}

/* CREDENTIAL STRIP */
.strip {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.strip-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 40px 28px;
}
.strip-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-left: 1px solid var(--line);
  padding-left: 18px;
}
.strip-num {
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--amber);
}
.strip-label {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.4;
}

/* SECTIONS */
.section { padding: 96px 0; position: relative; z-index: 1; }
.section-alt { background: var(--surface); }

.section-eyebrow {
  color: var(--teal);
  font-size: 0.78rem;
  margin: 0 0 14px;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  max-width: 720px;
}
.section-lead {
  color: var(--muted);
  max-width: 620px;
  margin: 0 0 48px;
  font-size: 1.02rem;
}

/* SERVICES */
.service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.service-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 32px;
}
.section-alt .service-card,
.section-alt .stack-card,
.section-alt .case-card { background: var(--surface-2); }

.service-tag {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--amber);
  border: 1px solid var(--amber);
  border-radius: 3px;
  padding: 3px 8px;
  margin-bottom: 16px;
}
.service-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0 0 12px;
}
.service-card > p { color: var(--muted); margin: 0 0 18px; }
.service-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.service-list li {
  padding-left: 18px;
  position: relative;
  font-size: 0.94rem;
  color: var(--text);
}
.service-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 2px;
  background: var(--teal);
}

/* STACK */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stack-card {
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 24px;
}
.stack-card h3 {
  font-size: 1rem;
  color: var(--amber);
  margin: 0 0 10px;
}
.stack-card p { color: var(--muted); font-size: 0.88rem; margin: 0; }

/* CASE STUDIES */
.case-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.case-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.case-visual {
  height: 140px;
  position: relative;
  background: var(--ink);
  overflow: hidden;
}
.case-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-size: 220px 220px, 100% 100%;
  background-repeat: repeat, no-repeat;
}
.case-visual[data-pattern="airfoil"]::before {
  background-image: repeating-linear-gradient(100deg, transparent 0 18px, rgba(31,182,166,0.35) 18px 19px), linear-gradient(120deg, var(--blue) 0%, transparent 60%);
}
.case-visual[data-pattern="hull"]::before {
  background-image: repeating-linear-gradient(96deg, transparent 0 22px, rgba(43,108,184,0.4) 22px 23px), linear-gradient(200deg, var(--teal) 0%, transparent 55%);
}
.case-visual[data-pattern="riser"]::before {
  background-image: repeating-radial-gradient(circle at 30% 50%, rgba(242,169,59,0.28) 0 2px, transparent 2px 26px), linear-gradient(160deg, var(--amber) 0%, transparent 50%);
}
.case-visual[data-pattern="shock"]::before {
  background-image: repeating-linear-gradient(70deg, transparent 0 10px, rgba(214,85,63,0.4) 10px 11px), linear-gradient(140deg, var(--red) 0%, transparent 55%);
}
.case-visual[data-pattern="plate"]::before {
  background-image: radial-gradient(circle, rgba(31,182,166,0.4) 0 3px, transparent 3px 3px), linear-gradient(180deg, var(--teal) 0%, transparent 60%);
  background-size: 26px 26px, 100% 100%;
}
.case-visual[data-pattern="turbine"]::before {
  background-image: repeating-conic-gradient(from 0deg, rgba(242,169,59,0.32) 0deg 4deg, transparent 4deg 26deg), radial-gradient(circle at 50% 50%, var(--amber) 0%, transparent 60%);
  background-position: center, center;
}
.case-visual[data-pattern="compressor"]::before {
  background-image: repeating-conic-gradient(from 10deg, rgba(43,108,184,0.34) 0deg 3deg, transparent 3deg 18deg), radial-gradient(circle at 50% 50%, var(--blue) 0%, transparent 65%);
  background-position: center, center;
}
.case-visual[data-pattern="inlet"]::before {
  background-image: repeating-linear-gradient(115deg, transparent 0 14px, rgba(214,85,63,0.38) 14px 15px), repeating-linear-gradient(65deg, transparent 0 14px, rgba(242,169,59,0.28) 14px 15px);
}
.case-body { padding: 26px; }
.case-meta {
  font-size: 0.72rem;
  color: var(--teal);
  margin-bottom: 12px;
}
.case-body h3 {
  font-family: var(--font-display);
  font-size: 1.12rem;
  margin: 0 0 10px;
  line-height: 1.3;
}
.case-title-link {
  color: var(--text);
  text-decoration: none;
  background-image: linear-gradient(var(--amber), var(--amber));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: background-size 0.2s ease, color 0.2s ease;
}
.case-title-link:hover { color: var(--amber); background-size: 100% 1px; }
.case-body > p { color: var(--muted); font-size: 0.92rem; margin: 0 0 18px; }
.case-stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.76rem;
  color: var(--text);
}
.case-stats span {
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 8px;
}

/* CONSULTANT */
.consultant-card {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 44px;
  align-items: start;
}
.consultant-mono {
  width: 128px;
  height: 128px;
  border-radius: 6px;
  object-fit: cover;
  border: 1px solid var(--line);
  /* subtle wash so the source thumbnail sits on-brand rather than reading
     as a bare stock photo dropped into a dark UI */
  box-shadow: 0 0 0 1px rgba(31,182,166,0.15) inset;
}
.consultant-title { margin-top: 0; }
.consultant-role {
  color: var(--teal);
  font-size: 0.98rem;
  margin: -8px 0 22px;
}
.consultant-bio { color: var(--muted); margin: 0 0 26px; max-width: 640px; }
.consultant-facts {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.consultant-facts li { font-size: 0.92rem; color: var(--text); }
.consultant-facts .mono { color: var(--amber); margin-right: 10px; }

.consultant-pubs { border-top: 1px solid var(--line); padding-top: 24px; }
.pub-label { color: var(--muted); font-size: 0.72rem; margin: 0 0 14px; }
.consultant-pubs ul { list-style: none; padding: 0; margin: 0 0 18px; display: flex; flex-direction: column; gap: 10px; }
.consultant-pubs li { font-size: 0.9rem; color: var(--text); }
.consultant-pubs .mono { color: var(--muted); font-size: 0.78rem; }
.scholar-link {
  color: var(--amber);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}
.scholar-link:hover { text-decoration: underline; }

/* CONTACT */
.contact-section { text-align: left; }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.contact-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.contact-card:hover { border-color: var(--amber); transform: translateY(-2px); }
.contact-label { color: var(--muted); font-size: 0.72rem; }
.contact-email { color: var(--text); font-size: 1.02rem; font-weight: 600; }

/* CASE DETAIL PAGE */
.case-hero {
  border-bottom: 1px solid var(--line);
  padding: 56px 0 44px;
  background: var(--surface);
}
.back-link {
  display: inline-block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  margin-bottom: 22px;
}
.back-link:hover { color: var(--teal); }
.case-hero-meta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.case-hero-meta span {
  font-size: 0.72rem;
  color: var(--teal);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 9px;
}
.case-hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  max-width: 820px;
}
.case-hero-lead { color: var(--muted); max-width: 680px; font-size: 1.04rem; margin: 0; }

.case-detail-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  align-items: start;
}
.case-detail-main h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin: 36px 0 14px;
}
.case-detail-main h2:first-child { margin-top: 0; }
.case-detail-main p { color: var(--muted); margin: 0 0 14px; }
.case-detail-main ul { margin: 0 0 14px; padding-left: 20px; color: var(--muted); }
.case-detail-main li { margin-bottom: 8px; }

.case-sidebar {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 26px;
  background: var(--surface);
  position: sticky;
  top: 90px;
}
.case-sidebar h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 16px;
}
.case-sidebar-stats { list-style: none; padding: 0; margin: 0 0 24px; display: flex; flex-direction: column; gap: 10px; }
.case-sidebar-stats li {
  display: flex;
  justify-content: space-between;
  font-size: 0.86rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}
.case-sidebar-stats li span:first-child { color: var(--muted); }
.case-sidebar-stats li span:last-child { font-family: var(--font-mono); color: var(--text); }

.refs-section { margin-top: 56px; border-top: 1px solid var(--line); padding-top: 40px; }
.refs-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 20px; }
.refs-list li {
  padding-left: 22px;
  position: relative;
  font-size: 0.94rem;
  color: var(--text);
  line-height: 1.5;
}
.refs-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 2px;
  background: var(--amber);
}
.refs-list .ref-cite { color: var(--muted); }
.refs-list .ref-venue { font-family: var(--font-mono); font-size: 0.78rem; color: var(--teal); }
.refs-note { color: var(--muted); font-size: 0.86rem; margin-top: 18px; }

.case-cta {
  margin-top: 56px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.case-cta p { margin: 0; color: var(--muted); }

@media (max-width: 860px) {
  .case-detail-grid { grid-template-columns: 1fr; }
  .case-sidebar { position: static; }
}

/* RESEARCH PAGE */
.research-hero {
  border-bottom: 1px solid var(--line);
  padding: 64px 0 48px;
  background: var(--surface);
}
.research-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.1rem, 4.6vw, 3.2rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 18px;
  max-width: 780px;
}
.research-hero-lead { color: var(--muted); max-width: 660px; font-size: 1.06rem; margin: 0 0 30px; }
.research-themes { display: flex; gap: 10px; flex-wrap: wrap; }
.research-themes span {
  font-size: 0.76rem;
  color: var(--teal);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 6px 11px;
  font-family: var(--font-mono);
}

.research-timeline {
  position: relative;
  max-width: 880px;
  margin: 0 auto;
  padding-left: 96px;
}
.research-timeline::before {
  content: "";
  position: absolute;
  left: 37px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}
.research-item { position: relative; margin-bottom: 56px; }
.research-item:last-child { margin-bottom: 0; }
.research-year {
  position: absolute;
  left: -96px;
  top: 2px;
  width: 74px;
  text-align: right;
  color: var(--amber);
  font-size: 0.92rem;
  font-weight: 600;
}
.research-year::after {
  content: "";
  position: absolute;
  right: -66px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
}
.research-meta { color: var(--teal); font-size: 0.74rem; margin-bottom: 10px; }
.research-item h3 {
  font-family: var(--font-display);
  font-size: 1.28rem;
  line-height: 1.32;
  margin: 0 0 12px;
  max-width: 640px;
}
.research-item p { color: var(--muted); max-width: 640px; margin: 0 0 16px; }
.research-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.research-tags span {
  font-size: 0.72rem;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 3px 8px;
}
.research-thesis {
  border-left: 2px solid var(--amber);
  padding-left: 20px;
}

@media (max-width: 720px) {
  .research-timeline { padding-left: 28px; }
  .research-timeline::before { left: 4px; }
  .research-year {
    position: static;
    display: block;
    width: auto;
    text-align: left;
    margin-bottom: 8px;
  }
  .research-year::after { left: -28px; right: auto; top: 8px; }
}

/* FOOTER */
.site-footer { border-top: 1px solid var(--line); padding: 28px 0; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.84rem;
  flex-wrap: wrap;
  gap: 10px;
}
.footer-tag { color: var(--teal); }

/* RESPONSIVE */
@media (max-width: 860px) {
  /* No blade cascade at this width, and the copy fills the frame — so the
     scrim fades vertically instead of across the headline column. */
  .hero::after {
    background:
      linear-gradient(180deg, rgba(10,14,22,0.55) 0%, rgba(10,14,22,0.72) 40%, rgba(10,14,22,0.85) 80%, var(--ink) 100%);
  }
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    transition: max-height 0.25s ease;
    z-index: 49;
  }
  .nav.is-open { max-height: 420px; }
  .nav a:not(.nav-cta) {
    display: block;
    padding: 15px 28px;
    border-bottom: 1px solid var(--line);
  }
  .nav-cta { margin: 14px 28px; text-align: center; }
  .strip-inner { grid-template-columns: 1fr 1fr; }
  .service-grid { grid-template-columns: 1fr; }
  .stack-grid { grid-template-columns: 1fr 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .consultant-card { grid-template-columns: 1fr; }
  .consultant-mono { width: 80px; height: 80px; font-size: 1.6rem; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero-readout { display: none; }
}