:root {
  --deep-navy: #1E3A5F;
  --engineering-blue: #2563EB;
  --cyan: #06B6D4;
  --off-white: #F8FAFC;
  --graphite: #111827;
  --white: #ffffff;
  --text-muted: #4B5563;
  --border: #E5E7EB;
  --shadow: 0 4px 24px rgba(30, 58, 95, 0.08);
  --radius: 8px;
  --header-h: 72px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--graphite);
  background: var(--white);
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--engineering-blue); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--deep-navy); }

.container {
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

.section { padding: 5rem 0; }
.section-alt { padding: 5rem 0; background: var(--off-white); }

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  color: var(--deep-navy);
  margin: 0 0 0.75rem;
  font-weight: 700;
}

.section-header p {
  color: var(--text-muted);
  margin: 0;
  font-size: 1.05rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  font-family: inherit;
}

.btn-primary {
  background: var(--engineering-blue);
  color: var(--white);
}
.btn-primary:hover {
  background: #1d4ed8;
  color: var(--white);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.35);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: var(--white);
  border-color: rgba(255,255,255,0.6);
}

.btn-sm { padding: 0.5rem 1.25rem; font-size: 0.875rem; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1rem;
}

.logo { height: 32px; width: auto; }

.main-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: var(--graphite);
  font-weight: 500;
  font-size: 0.9rem;
}
.main-nav a:hover { color: var(--engineering-blue); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.lang-btn {
  padding: 0.35rem 0.65rem;
  border: none;
  background: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  font-family: inherit;
  transition: background var(--transition), color var(--transition);
}

.lang-btn.active,
.lang-btn:hover {
  background: var(--deep-navy);
  color: var(--white);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--graphite);
  transition: transform var(--transition), opacity var(--transition);
}

/* Hero */
.hero {
  position: relative;
  background: var(--deep-navy);
  color: var(--white);
  padding: 5rem 0 6rem;
  overflow: hidden;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, transparent 50%),
    linear-gradient(225deg, rgba(6, 182, 212, 0.06) 0%, transparent 40%);
  pointer-events: none;
}

.hero-grid-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 65% 50%, black 20%, transparent 70%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-tagline {
  color: var(--cyan);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 1.25rem;
}

.hero-sub {
  font-size: 1.1rem;
  opacity: 0.9;
  margin: 0 0 2rem;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-diagram {
  position: relative;
  width: min(400px, 100%);
  aspect-ratio: 1;
}

.diagram-orbit {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(6, 182, 212, 0.15);
  border-radius: 50%;
  animation: orbit-pulse 6s ease-in-out infinite;
}

.diagram-orbit--2 {
  inset: 12%;
  border-color: rgba(37, 99, 235, 0.2);
  animation-delay: -3s;
}

@keyframes orbit-pulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.02); }
}

.diagram-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--engineering-blue), var(--cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 40px rgba(6, 182, 212, 0.35), 0 0 80px rgba(37, 99, 235, 0.2);
  z-index: 2;
}

.diagram-core-label {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.05em;
}

.diagram-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.diagram-line {
  stroke: rgba(6, 182, 212, 0.25);
  stroke-width: 1.5;
  stroke-dasharray: 6 4;
}

.diagram-node {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  z-index: 3;
  transform: translate(-50%, -50%);
}

.diagram-node-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  color: var(--cyan);
}

.diagram-node-icon i {
  font-size: 1.25rem;
}

.diagram-node-icon svg {
  width: 22px;
  height: 22px;
}

.diagram-node-text {
  font-size: 0.7rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.diagram-node--1 { top: 8%;  left: 50%; }
.diagram-node--2 { top: 50%; left: 92%; }
.diagram-node--3 { top: 92%; left: 50%; }
.diagram-node--4 { top: 50%; left: 8%;  }

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.card {
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  background: var(--white);
  transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.card-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--engineering-blue);
  margin-bottom: 1.25rem;
  font-size: 1.75rem;
}

.card-icon svg { width: 100%; height: 100%; }

.card h3 {
  font-size: 1.15rem;
  color: var(--deep-navy);
  margin: 0 0 0.75rem;
}

.card p {
  color: var(--text-muted);
  margin: 0;
  font-size: 0.95rem;
}

/* Stats */
.stats-title {
  text-align: center;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--deep-navy);
  margin: 0 0 3rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-number {
  display: block;
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  color: var(--deep-navy);
  line-height: 1.1;
}

.stat-label {
  display: block;
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Solutions */
.solution-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.solution-item {
  padding: 1.75rem;
  border-left: 3px solid var(--engineering-blue);
  background: var(--off-white);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.solution-icon {
  color: var(--engineering-blue);
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.solution-item h3 {
  margin: 0 0 0.5rem;
  color: var(--deep-navy);
  font-size: 1.1rem;
}

.solution-item p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* About */
.about-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  color: var(--deep-navy);
  margin: 0 0 1.5rem;
}

.about-quote {
  font-size: 1.2rem;
  font-style: italic;
  color: var(--engineering-blue);
  border-left: 3px solid var(--cyan);
  margin: 0 0 1.5rem;
  padding-left: 1.25rem;
}

.about-content p {
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.highlight {
  padding: 1.25rem 1.5rem;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.highlight-icon {
  display: block;
  color: var(--engineering-blue);
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.highlight strong {
  display: block;
  color: var(--deep-navy);
  margin-bottom: 0.25rem;
}

.highlight span {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--white);
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.project-media {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--deep-navy);
}

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.project-card:hover .project-media img {
  transform: scale(1.05);
}

.project-body {
  padding: 1.25rem 1.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-tag {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--white);
  background: rgba(30, 58, 95, 0.85);
  backdrop-filter: blur(4px);
  padding: 0.25rem 0.65rem;
  border-radius: 4px;
}

.project-card h3 {
  font-size: 1.05rem;
  color: var(--deep-navy);
  margin: 0 0 0.5rem;
}

.project-card p {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  flex: 1;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--engineering-blue);
  margin-top: auto;
}

.project-link:hover {
  color: var(--deep-navy);
}

.project-link i {
  font-size: 0.75rem;
}

/* Career */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.benefit {
  padding: 1.5rem;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.benefit-icon {
  display: block;
  color: var(--engineering-blue);
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.benefit h3 {
  font-size: 1rem;
  color: var(--deep-navy);
  margin: 0 0 0.5rem;
}

.benefit p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.jobs-heading {
  font-size: 1.25rem;
  color: var(--deep-navy);
  margin: 0 0 1rem;
}

.job-list { display: flex; flex-direction: column; gap: 0.75rem; }

.job-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.job-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  color: var(--deep-navy);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.job-item summary::-webkit-details-marker { display: none; }

.job-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--engineering-blue);
  transition: transform var(--transition);
}

.job-item[open] summary::after { content: '−'; }

.job-body {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.job-body ul { margin: 0.5rem 0; padding-left: 1.25rem; }
.job-body a { font-weight: 500; }

/* Contact */
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact h2 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  color: var(--deep-navy);
  margin: 0 0 0.75rem;
}

.contact-info > p {
  color: var(--text-muted);
  margin: 0 0 2rem;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--text-muted);
}

.contact-list i {
  width: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--engineering-blue);
  font-size: 1.1rem;
  text-align: center;
}

.contact-list svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--engineering-blue);
}

.contact-form {
  background: var(--off-white);
  padding: 2rem;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--border);
}

.form-group { margin-bottom: 1.25rem; }

.form-group label {
  display: block;
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
  color: var(--graphite);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--engineering-blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.contact-map-wrap {
  margin-top: 3rem;
}

.contact-map {
  height: 360px;
  border-radius: calc(var(--radius) + 4px);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: var(--off-white);
  z-index: 0;
}

.contact-map-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--engineering-blue);
}

.contact-map-link:hover {
  color: var(--deep-navy);
}

.contact-map-link::after {
  content: '\2197';
  font-size: 0.8rem;
}

/* Leaflet palette overrides */
.contact-map .leaflet-tile-pane {
  filter: saturate(0.9) contrast(1.02);
}

.contact-map .leaflet-control-zoom a {
  color: var(--deep-navy);
  border-color: var(--border);
}

.contact-map .leaflet-control-zoom a:hover {
  background: var(--off-white);
  color: var(--engineering-blue);
}

.contact-map .leaflet-control-attribution {
  font-size: 0.65rem;
  background: rgba(248, 250, 252, 0.92);
  color: var(--text-muted);
}

.contact-map .leaflet-control-attribution a {
  color: var(--engineering-blue);
}

.map-marker {
  background: none;
  border: none;
}

.map-marker-pin {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--engineering-blue), var(--cyan));
  border: 3px solid var(--white);
  border-radius: 50% 50% 50% 0;
  transform: rotate(-45deg);
  box-shadow: 0 4px 12px rgba(30, 58, 95, 0.35);
}

.map-marker-pin i {
  transform: rotate(45deg);
  color: var(--white);
  font-size: 0.9rem;
}

.contact-map .leaflet-popup-content-wrapper {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--graphite);
  font-family: var(--font);
  font-size: 0.875rem;
  line-height: 1.5;
}

.contact-map .leaflet-popup-tip {
  background: var(--white);
  border: 1px solid var(--border);
  box-shadow: none;
}

.contact-map .leaflet-popup-close-button {
  color: var(--text-muted);
}

.contact-map .leaflet-popup-close-button:hover {
  color: var(--engineering-blue);
}

/* Footer */
.site-footer {
  background: var(--graphite);
  color: rgba(255,255,255,0.7);
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-logo { filter: brightness(0) invert(1); opacity: 0.9; }

.footer-copy { margin: 0; font-size: 0.85rem; }

.footer-nav {
  display: flex;
  gap: 1.5rem;
}

.footer-nav a {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
}
.footer-nav a:hover { color: var(--white); }

/* Legal pages */
.legal-page {
  padding: 3rem 0 5rem;
  max-width: 800px;
}

.legal-page h1 {
  color: var(--deep-navy);
  font-size: 2rem;
  margin: 0 0 2rem;
}

.legal-page h2 {
  color: var(--deep-navy);
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
}

.legal-page h3 { font-size: 1rem; margin: 1.5rem 0 0.5rem; }

.legal-page p, .legal-page li {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.legal-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
  font-weight: 500;
}

/* Responsive */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-sub { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { max-width: 340px; margin: 2rem auto 0; }
  .card-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-list { grid-template-columns: 1fr; }
  .about-inner { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-inner { grid-template-columns: 1fr; }
  .contact-map { height: 300px; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .hero-visual { display: none; }
  .hero { padding: 4rem 0 5rem; }

  .main-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .main-nav a {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
  }

  .header-actions .btn-primary { display: none; }

  .project-grid { grid-template-columns: 1fr; }
  .benefits-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .section { padding: 3.5rem 0; }
  .section-alt { padding: 3.5rem 0; }
  .hero { padding: 3rem 0 4rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { text-align: center; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}