:root {
  --navy: #1d2c34;
  --navy-dark: #121c21;
  --steel: #6c7f89;
  --accent: #951a24;
  --accent-dark: #72141c;
  --grey-100: #eef0f1;
  --grey-200: #dfe3e5;
  --grey-500: #66757d;
  --grey-700: #37444a;
  --white: #ffffff;
  --radius: 10px;
  --max-width: 1180px;
  --shadow: 0 10px 30px rgba(29, 44, 52, 0.1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--grey-700);
  background: var(--white);
  line-height: 1.6;
}

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

a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--navy);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 42px;
  width: auto;
  display: block;
}

.footer-logo {
  height: 36px;
  width: auto;
  display: block;
  margin-bottom: 16px;
}

.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav-links a {
  color: var(--grey-200);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 10px 16px;
  border-radius: 6px;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.08);
  color: var(--white);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  margin: 5px 0;
  transition: 0.2s;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: var(--white);
  padding: 96px 0 88px;
}

.hero .eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: 2.75rem;
  line-height: 1.15;
  margin: 0 0 20px;
  max-width: 700px;
}

.hero p {
  font-size: 1.15rem;
  color: var(--grey-200);
  max-width: 600px;
  margin: 0 0 32px;
}

.page-hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-dark) 100%);
  color: var(--white);
  padding: 64px 0;
}

.page-hero .eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.page-hero h1 {
  font-size: 2.25rem;
  margin: 0 0 12px;
}

.page-hero p {
  color: var(--grey-200);
  max-width: 640px;
  margin: 0;
  font-size: 1.05rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.12s ease, background 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
}

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

.btn-secondary {
  background: rgba(255,255,255,0.08);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.25);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.16);
}

.btn-group { display: flex; gap: 14px; flex-wrap: wrap; }

/* Sections */
section { padding: 80px 0; }

.section-alt { background: var(--grey-100); }

.section-header { max-width: 700px; margin: 0 0 48px; }

.section-header .eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 2rem;
  color: var(--navy);
  margin: 0 0 14px;
}

.section-header p { color: var(--grey-500); font-size: 1.05rem; margin: 0; }

/* Cards / grids */
.grid {
  display: grid;
  gap: 28px;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--white);
  border: 1px solid var(--grey-200);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.card .icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(149,26,36,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 1.4rem;
}

.card h3 {
  color: var(--navy);
  font-size: 1.2rem;
  margin: 0 0 10px;
}

.card p { margin: 0; color: var(--grey-500); }

/* Timeline */
.timeline {
  border-left: 2px solid var(--grey-200);
  margin-left: 12px;
  padding-left: 36px;
}

.timeline-item { position: relative; padding-bottom: 44px; }

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

.timeline-item::before {
  content: "";
  position: absolute;
  left: -43px;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--grey-200);
}

.timeline-item .year {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 6px;
}

.timeline-item h3 { color: var(--navy); margin: 0 0 8px; font-size: 1.15rem; }
.timeline-item p { margin: 0; color: var(--grey-500); }

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat .number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--navy);
}

.stat .label {
  color: var(--grey-500);
  font-size: 0.9rem;
  margin-top: 4px;
}

/* Product / project layout */
.product-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0;
  border-bottom: 1px solid var(--grey-200);
}

.product-row:last-child { border-bottom: none; }

.product-row.reverse .product-media { order: 2; }

.product-media {
  background: var(--grey-100);
  border-radius: var(--radius);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--grey-500);
  font-weight: 600;
  border: 1px solid var(--grey-200);
  text-align: center;
  padding: 20px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.product-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.product-tag {
  display: inline-block;
  background: rgba(149,26,36,0.1);
  color: var(--accent-dark);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 20px;
  margin-bottom: 14px;
}

.product-body h3 {
  color: var(--navy);
  font-size: 1.6rem;
  margin: 0 0 14px;
}

.product-body p { color: var(--grey-500); margin: 0 0 18px; }

.product-body ul {
  margin: 0 0 20px;
  padding-left: 20px;
  color: var(--grey-500);
}

.product-body li { margin-bottom: 6px; }

/* Leadership bio */
.leader-row {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 48px;
  align-items: center;
}

.leader-photo {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  max-height: 480px;
}

.leader-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.leader-name {
  color: var(--navy);
  font-size: 1.6rem;
  margin: 0 0 4px;
}

.leader-title {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.leader-bio p { color: var(--grey-500); margin: 0 0 16px; }
.leader-bio p:last-child { margin-bottom: 0; }

@media (max-width: 900px) {
  .leader-row { grid-template-columns: 1fr; }
  .leader-photo { max-height: 420px; }
}

/* Engineering projects grid */
.project-card {
  background: var(--navy);
  color: var(--white);
  border-radius: var(--radius);
  padding: 32px;
}

.project-card h3 { color: var(--white); font-size: 1.15rem; margin: 0 0 10px; }
.project-card p { color: var(--grey-200); margin: 0; font-size: 0.95rem; }
.project-card .tag { color: var(--accent); font-weight: 700; font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 10px; display:block; }

/* CTA band */
.cta-band {
  background: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 72px 0;
}

.cta-band h2 { font-size: 2rem; margin: 0 0 16px; }
.cta-band p { color: var(--grey-200); max-width: 560px; margin: 0 auto 32px; }
.cta-band .btn-group { justify-content: center; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}

.contact-info .item { margin-bottom: 28px; }
.contact-info .item h4 { color: var(--navy); margin: 0 0 6px; font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.04em; }
.contact-info .item p { margin: 0; color: var(--grey-500); }

form.contact-form { display: grid; gap: 18px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }

.form-hp {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.contact-form label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 6px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--grey-200);
  border-radius: 6px;
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--grey-100);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  background: var(--white);
}

.contact-form textarea { min-height: 140px; resize: vertical; }

/* Footer */
.site-footer {
  background: var(--navy-dark);
  color: var(--grey-200);
  padding: 56px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-grid h4 {
  color: var(--white);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 16px;
}

.footer-grid p { color: var(--grey-500); font-size: 0.9rem; max-width: 320px; }

.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a { color: var(--grey-200); font-size: 0.9rem; }
.footer-grid a:hover { color: var(--accent); }

.footer-bottom {
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--grey-500);
}

/* Responsive */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .product-row { grid-template-columns: 1fr; }
  .product-row.reverse .product-media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--navy);
    flex-direction: column;
    align-items: stretch;
    padding: 12px;
    display: none;
    gap: 4px;
    box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .hero h1 { font-size: 2.1rem; }
  .form-row { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  body { background: #10181c; color: #c7d0d4; }
  .section-alt { background: #141f24; }
  .card { background: #182429; border-color: #263237; }
  .card h3 { color: #f7f9f9; }
  .section-header h2 { color: #f7f9f9; }
  .product-media { background: #182429; border-color: #263237; }
  .product-body h3 { color: #f7f9f9; }
  .leader-name { color: #f7f9f9; }
  .contact-form input, .contact-form textarea { background: #182429; border-color: #263237; color: #c7d0d4; }
  .timeline-item h3 { color: #f7f9f9; }
  .contact-info .item h4 { color: #f7f9f9; }
  .stat .number { color: #f7f9f9; }
}