/* ===========================
   VARIABLES
=========================== */
:root {
  --navy-deep:   #080f1e;
  --navy:        #0c1628;
  --navy-mid:    #111f3a;
  --navy-raised: #162240;
  --navy-border-soft: rgba(255,255,255,0.08);
  --white:       #ffffff;
  --off-white:   #e8e4dc;
  --text-primary:   #f0eee8;
  --text-secondary: rgba(224,218,208,0.65);
  --text-muted:     rgba(224,218,208,0.35);
  --gold:        #5e9e7e;
  --gold-muted:  rgba(94,158,126,0.15);
  --gold-border: rgba(94,158,126,0.28);
  --teal:        #4db89a;
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --max:  1100px;
  --ease: 0.25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  font-weight: 300;
  background: var(--navy-deep);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

/* ===========================
   NAV
=========================== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 3rem; height: 58px;
  background: rgba(8,15,30,0.94);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--navy-border-soft);
}

.nav-name {
  font-family: var(--font-display);
  font-size: 17px; font-weight: 400;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

.nav-links { display: flex; align-items: center; gap: 2.5rem; }
.nav-links a {
  font-size: 12px; font-weight: 400;
  letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--text-muted); transition: color var(--ease);
}
.nav-links a:hover,
.nav-links a.nav-active { color: var(--text-primary); }

.nav-cta {
  color: var(--gold) !important;
  border: 1px solid var(--gold-border);
  padding: 5px 14px; border-radius: 2px;
  transition: all var(--ease) !important;
}
.nav-cta:hover { background: var(--gold-muted); border-color: var(--gold); }

/* ===========================
   PAGE HERO (inner pages)
=========================== */
.page-hero {
  padding: 100px 3rem 56px;
  background: var(--navy-deep);
  border-bottom: 1px solid var(--navy-border-soft);
  position: relative;
}

.page-hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
}

.page-hero .container { position: relative; z-index: 1; }

.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 2rem;
  transition: color var(--ease);
}
.back-link:hover { color: var(--gold); }

.page-hero-grid {
  display: flex; gap: 24px; align-items: flex-start;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 68px);
  font-weight: 300; line-height: 1;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.page-title em { font-style: italic; color: var(--text-muted); }

.page-subtitle {
  font-size: 15px; line-height: 1.75;
  color: var(--text-secondary); max-width: 560px;
}

/* ===========================
   PAGE BODY
=========================== */
.page-body {
  padding: 72px 3rem 96px;
  background: var(--navy-deep);
}

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

/* ===========================
   SECTION NUM
=========================== */
.section-num {
  font-family: var(--font-display);
  font-size: 80px; font-weight: 300; line-height: 1;
  color: rgba(255,255,255,0.04);
  flex-shrink: 0; margin-top: -8px;
}

/* ===========================
   SUBSECTIONS
=========================== */
.subsection { margin-bottom: 52px; }
.subsection:last-child { margin-bottom: 0; }

.subsection-label {
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--navy-border-soft);
}

/* ===========================
   CARDS
=========================== */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.cards-grid--wide { grid-template-columns: 1fr; }

.card {
  background: var(--navy-mid);
  border: 1px solid var(--navy-border-soft);
  border-radius: 3px;
  padding: 24px 26px;
  display: flex; flex-direction: column; gap: 12px;
  transition: border-color var(--ease), background var(--ease), transform var(--ease);
}
.card:hover {
  border-color: rgba(255,255,255,0.15);
  background: var(--navy-raised);
  transform: translateY(-2px);
}

.card--accent {
  border-color: var(--gold-border);
  background: rgba(94,158,126,0.05);
}
.card--accent:hover {
  border-color: var(--gold);
  background: rgba(94,158,126,0.08);
}

.card-top {
  display: flex; justify-content: space-between; align-items: center;
}

.card-org {
  font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gold);
}
.card-type {
  font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted);
}
.card-link {
  font-size: 11px; color: var(--teal); letter-spacing: 0.04em;
  transition: opacity var(--ease);
}
.card-link:hover { opacity: 0.7; }

.card h3 {
  font-family: var(--font-display);
  font-size: 21px; font-weight: 400; line-height: 1.2;
  color: var(--text-primary);
}
.card p {
  font-size: 13px; line-height: 1.78;
  color: var(--text-secondary); flex: 1;
}

.card-contact {
  font-size: 11px !important;
  color: var(--gold) !important;
  letter-spacing: 0.04em;
  border-top: 1px solid var(--navy-border-soft);
  padding-top: 10px !important;
  margin-top: 4px;
  flex: 0 !important;
}

.card-tags {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px;
}
.card-tags span {
  font-size: 10px; padding: 3px 9px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 2px; color: var(--text-muted);
  letter-spacing: 0.04em;
}

/* ===========================
   IOT FLOW
=========================== */
.iot-flow {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  padding: 14px 0;
  border-top: 1px solid var(--navy-border-soft);
  border-bottom: 1px solid var(--navy-border-soft);
}
.flow-node {
  font-size: 11px; padding: 4px 10px; border-radius: 3px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-secondary); white-space: nowrap;
}
.flow-node.node-proto { background: rgba(77,184,154,0.1); border-color: rgba(77,184,154,0.2); color: #4db89a; }
.flow-node.node-cloud { background: rgba(100,140,220,0.1); border-color: rgba(100,140,220,0.2); color: #6a9fdc; }
.flow-node.node-auto  { background: rgba(94,158,126,0.1); border-color: var(--gold-border); color: var(--gold); }
.flow-arrow { color: rgba(255,255,255,0.2); font-size: 12px; }

/* ===========================
   COURSES GRID
=========================== */
.courses-row {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--navy-border-soft);
  border-radius: 3px; overflow: hidden;
}
.course {
  padding: 16px 20px;
  border-right: 1px solid var(--navy-border-soft);
  border-bottom: 1px solid var(--navy-border-soft);
  display: flex; flex-direction: column; gap: 5px;
  transition: background var(--ease);
}
.course:hover { background: var(--navy-mid); }
.course:nth-child(3n) { border-right: none; }
.course:nth-last-child(-n+3) { border-bottom: none; }
.course-name { font-size: 13px; font-weight: 400; color: var(--text-primary); }
.course-detail { font-size: 11px; color: var(--text-muted); line-height: 1.5; }

/* ===========================
   RESEARCH LIST
=========================== */
.research-list {
  border: 1px solid var(--navy-border-soft);
  border-radius: 3px; overflow: hidden;
}
.research-item {
  display: grid; grid-template-columns: 200px 1fr;
  gap: 32px; padding: 28px 30px;
  border-bottom: 1px solid var(--navy-border-soft);
  transition: background var(--ease);
}
.research-item:last-child { border-bottom: none; }
.research-item:hover { background: rgba(255,255,255,0.02); }

.research-meta { display: flex; flex-direction: column; gap: 6px; padding-top: 4px; }
.research-org { font-size: 11px; letter-spacing: 0.09em; text-transform: uppercase; color: var(--gold); }
.research-year { font-size: 12px; color: var(--text-muted); }

.research-body { display: flex; flex-direction: column; gap: 10px; }
.research-body h3 {
  font-family: var(--font-display);
  font-size: 21px; font-weight: 400; line-height: 1.2;
  color: var(--text-primary);
}
.research-body p { font-size: 13px; line-height: 1.78; color: var(--text-secondary); }

.research-link {
  display: inline-block;
  font-size: 12px; color: var(--teal);
  letter-spacing: 0.04em;
  margin-top: 4px;
  transition: opacity var(--ease);
}
.research-link:hover { opacity: 0.7; }

/* ===========================
   FOOTER
=========================== */
.footer {
  background: var(--navy-deep);
  border-top: 1px solid var(--navy-border-soft);
  padding: 40px 3rem;
}
.footer-inner { display: flex; align-items: center; justify-content: space-between; }
.footer-name { font-family: var(--font-display); font-size: 18px; font-weight: 400; color: var(--text-primary); margin-bottom: 4px; }
.footer-sub { font-size: 12px; color: var(--text-muted); letter-spacing: 0.03em; }
.footer-links { display: flex; gap: 2rem; }
.footer-links a {
  font-size: 12px; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--text-muted); transition: color var(--ease);
}
.footer-links a:hover { color: var(--text-primary); }

/* ===========================
   ANIMATIONS
=========================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 900px) {
  .nav { padding: 0 1.5rem; }
  .page-hero { padding: 90px 1.5rem 48px; }
  .page-body { padding: 48px 1.5rem 72px; }
  .cards-grid { grid-template-columns: 1fr; }
  .courses-row { grid-template-columns: repeat(2, 1fr); }
  .courses-row .course:nth-child(3n) { border-right: 1px solid var(--navy-border-soft); }
  .courses-row .course:nth-child(2n) { border-right: none; }
  .research-item { grid-template-columns: 1fr; gap: 10px; }
  .footer-inner { flex-direction: column; gap: 24px; align-items: flex-start; }
  .page-hero-grid { flex-direction: column; gap: 8px; }
  .section-num { display: none; }
}

@media (max-width: 600px) {
  .nav-links a:not(.nav-cta) { display: none; }
  .courses-row { grid-template-columns: 1fr; }
  .courses-row .course { border-right: none; }
  .footer-links { flex-wrap: wrap; gap: 1rem; }
}