:root {
  --color-icy: #F4F7FA;
  --color-white: #FFFFFF;
  --color-cobalt: #0052CC;
  --color-cobalt-dark: #003d99;
  --color-cobalt-soft: rgba(0, 82, 204, 0.08);
  --color-graphite: #1F2937;
  --color-slate: #374151;
  --color-lime: #84CC16;
  --color-lime-soft: #D9F99D;
  --color-alert: #DC2626;
  --color-warning: #F59E0B;
  --color-border: #E2E8F0;
  --color-muted: #64748B;
  --radius: 8px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --transition-base: 0.3s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--color-graphite);
  background: var(--color-white);
  line-height: 1.6;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--color-graphite);
}

a { color: var(--color-cobalt); text-decoration: none; }

ul { list-style: none; }

img { max-width: 100%; height: auto; display: block; }

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section-padding { padding-block: 5rem; }

.bg-icy { background-color: var(--color-icy); }

.reveal-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  color: var(--color-graphite);
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--color-cobalt);
  color: var(--color-white);
  border-radius: var(--radius);
  font-size: 1.1rem;
}

.main-nav .nav-list { 
  display: flex; 
  gap: 2rem; 
}

.main-nav a {
  color: var(--color-slate);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding-block: 0.25rem;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-lime);
  transition: width var(--transition-base);
}

.main-nav a:hover::after { width: 100%; }
.main-nav a:hover { color: var(--color-cobalt); }

.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger, .hamburger::before, .hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-graphite);
  transition: var(--transition-base);
}

.hamburger {
  position: relative;
}

.hamburger::before, .hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  transform-origin: center;
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.mobile-nav-toggle.is-open .hamburger { background: transparent; }
.mobile-nav-toggle.is-open .hamburger::before { transform: rotate(45deg); top: 0; }
.mobile-nav-toggle.is-open .hamburger::after { transform: rotate(-45deg); top: 0; }

/* Hero */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.55);
}

.hero-content {
  position: relative;
  z-index: 1;
  color: var(--color-white);
}

.hero-text { max-width: 720px; }

.hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  color: var(--color-white);
  margin-bottom: 1.25rem;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  opacity: 0.92;
  margin-bottom: 2rem;
  max-width: 600px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
  text-decoration: none;
}

.btn:active { transform: translateY(1px) scale(0.98); }

.btn-primary {
  background: var(--color-cobalt);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(0,82,204,0.25);
}

.btn-primary:hover { background: var(--color-cobalt-dark); }

.btn-secondary {
  background: var(--color-white);
  color: var(--color-cobalt);
  border-color: var(--color-cobalt);
}

.btn-secondary:hover {
  background: var(--color-cobalt);
  color: var(--color-white);
}

.btn-block { width: 100%; }

/* Overview */
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.overview-media img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.feature-list { margin-top: 1.5rem; }

.feature-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--color-slate);
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-lime);
}

/* Training */
.section-header {
  max-width: 640px;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin-bottom: 0.75rem;
}

.section-header p { color: var(--color-slate); }

.programs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.program-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.program-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.program-icon {
  width: 48px;
  height: 48px;
  color: var(--color-cobalt);
  margin-bottom: 1rem;
}

.program-card h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.program-card p { font-size: 0.95rem; color: var(--color-slate); }

/* Logistics Lab */
.lab-visual {
  margin-bottom: 3rem;
  border-radius: var(--radius);
  overflow: hidden;
}

.lab-visual img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.lab-projects {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.project-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: box-shadow var(--transition-base);
  position: relative;
}

.project-card:hover { box-shadow: var(--shadow-md); }

.project-tag {
  display: inline-block;
  background: var(--color-icy);
  color: var(--color-cobalt);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.project-card h4 { margin-bottom: 1rem; font-size: 1.1rem; }
.project-card dl { font-size: 0.92rem; }
.project-card dt {
  color: var(--color-muted);
  margin-top: 0.75rem;
}
.project-card dd { color: var(--color-graphite); font-weight: 600; }

/* Interactive Lab */
.interactive-lab {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.dashboard-panel, .route-panel {
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  background: var(--color-white);
}

.dashboard-panel h3, .route-panel h3 { margin-bottom: 1.25rem; font-size: 1.15rem; }

.sensor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.sensor-card {
  background: var(--color-icy);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-left: 4px solid var(--color-lime);
  transition: border-color 0.3s ease;
}

.sensor-card.alert { border-left-color: var(--color-alert); }
.sensor-card.warning { border-left-color: var(--color-warning); }

.sensor-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.sensor-zone { font-weight: 600; font-size: 0.9rem; }
.sensor-target { font-size: 0.75rem; color: var(--color-muted); }

.sensor-values {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.sensor-temp {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-graphite);
  font-variant-numeric: tabular-nums;
}

.sensor-unit { font-size: 0.9rem; color: var(--color-muted); }

.sensor-status {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.sensor-status.ok { color: var(--color-lime); }
.sensor-status.warning { color: var(--color-warning); }
.sensor-status.alert { color: var(--color-alert); }

.sensor-graph {
  height: 40px;
  display: flex;
  align-items: flex-end;
  gap: 3px;
  margin-top: 0.25rem;
}

.sensor-bar {
  flex: 1;
  background: var(--color-lime);
  opacity: 0.7;
  border-radius: 2px 2px 0 0;
  transition: height 0.4s ease, background 0.3s ease;
}

/* Route */
.route-visual { margin-bottom: 1rem; }

.route-visual svg { width: 100%; height: auto; }

.route-node {
  cursor: pointer;
  stroke: var(--color-white);
  stroke-width: 2px;
  transition: r 0.2s ease, fill 0.2s ease;
}

.route-node:hover, .route-node:focus {
  r: 8;
  fill: var(--color-cobalt);
  outline: none;
}

.route-path {
  stroke-dasharray: 600;
  stroke-dashoffset: 600;
  animation: drawRoute 1.2s ease forwards;
}

@keyframes drawRoute {
  to { stroke-dashoffset: 0; }
}

.route-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1rem;
}

.metric {
  background: var(--color-icy);
  border-radius: var(--radius);
  padding: 0.875rem;
}

.metric-label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-muted);
  margin-bottom: 0.25rem;
}

.metric-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-graphite);
}

.route-controls { text-align: center; }

/* Timeline */
.timeline-section { margin-bottom: 4rem; }
.timeline-section h3 { margin-bottom: 2rem; font-size: 1.35rem; }

.timeline { position: relative; }

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-left: 64px;
  padding-bottom: 2.5rem;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-white);
  border: 2px solid var(--color-cobalt);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-cobalt);
  box-shadow: var(--shadow-sm);
  transition: background 0.3s ease, color 0.3s ease;
}

.timeline-item.active-step .timeline-marker {
  background: var(--color-cobalt);
  color: var(--color-white);
}

.timeline-content h4 { margin-bottom: 0.5rem; font-size: 1.1rem; }
.timeline-content p { color: var(--color-slate); font-size: 0.95rem; }

/* Case Studies */
.case-studies h3 { margin-bottom: 1.5rem; font-size: 1.35rem; }

.case-list {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.case-item + .case-item { border-top: 1px solid var(--color-border); }

.case-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  background: var(--color-white);
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-graphite);
  font-family: inherit;
}

.case-header:hover { background: var(--color-icy); }

.case-icon::after {
  content: '+';
  display: block;
  font-size: 1.25rem;
  color: var(--color-cobalt);
  transition: transform 0.2s ease;
}

.case-header[aria-expanded="true"] .case-icon::after { content: '−'; }

.case-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: var(--color-white);
}

.case-header[aria-expanded="true"] + .case-body {
  max-height: 300px;
  padding: 0 1.5rem 1.25rem;
}

.case-body p { color: var(--color-slate); font-size: 0.95rem; line-height: 1.6; }

/* Enrollment */
.enrollment-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.contact-block img {
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.contact-list .contact-item { margin-bottom: 1.25rem; }
.contact-list dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: 0.25rem;
}
.contact-list dd { font-weight: 600; color: var(--color-graphite); }
.contact-list a:hover { text-decoration: underline; }

.application-form {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
}

.application-form h3 { margin-bottom: 1.25rem; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }

.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--color-slate); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font: inherit;
  color: var(--color-graphite);
  background: var(--color-white);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-cobalt);
  box-shadow: 0 0 0 3px rgba(0,82,204,0.1);
}

.form-disclaimer { font-size: 0.85rem; color: var(--color-muted); margin-top: 0.75rem; }

.form-status { margin-top: 1rem; font-weight: 600; min-height: 1.5em; }
.form-status.success { color: #059669; }
.form-status.error { color: var(--color-alert); }

/* Footer */
.site-footer {
  background: var(--color-graphite);
  color: var(--color-white);
  padding-block: 3rem;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.footer-brand .logo-mark {
  display: inline-grid;
}

.footer-brand p { opacity: 0.8; font-size: 0.95rem; max-width: 320px; }

.footer-nav ul { display: flex; gap: 1.5rem; }
.footer-nav a { color: rgba(255,255,255,0.85); font-size: 0.95rem; }
.footer-nav a:hover { color: var(--color-white); text-decoration: underline; }

.footer-meta { font-size: 0.9rem; opacity: 0.7; width: 100%; text-align: center; margin-top: 1rem; }

/* Responsive */
@media (max-width: 1024px) {
  .programs-grid { grid-template-columns: repeat(2, 1fr); }
  .lab-projects { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem;
  }
  .main-nav.open { display: block; }
  .main-nav .nav-list { flex-direction: column; gap: 1rem; }

  .mobile-nav-toggle { display: block; }

  .hero { min-height: 88vh; }

  .overview-grid { grid-template-columns: 1fr; }
  .programs-grid { grid-template-columns: 1fr; }
  .lab-projects { grid-template-columns: 1fr; }
  .interactive-lab { grid-template-columns: 1fr; }
  .enrollment-grid { grid-template-columns: 1fr; }
  .route-metrics { grid-template-columns: 1fr; }

  .timeline::before { left: 16px; }
  .timeline-item { padding-left: 48px; }
  .timeline-marker { width: 36px; height: 36px; font-size: 0.75rem; }

  .form-row { grid-template-columns: 1fr; }

  .footer-grid { flex-direction: column; text-align: center; }
  .footer-nav ul { flex-wrap: wrap; justify-content: center; }
}