/* =========================================================
   ID Engineering — Design System
   Navy / Engineering Blue / Silver — blueprint-inspired
   ========================================================= */

:root {
  --navy-900: #0A1E3D;
  --navy-800: #123058;
  --navy-700: #1A3D6E;
  --blue-600: #0B5FA8;
  --blue-500: #1C74C4;
  --blue-100: #E7F0FA;
  --silver-500: #9AA1AA;
  --silver-300: #C7CCD2;
  --silver-100: #F2F4F6;
  --white: #FFFFFF;
  --ink-900: #16202E;
  --ink-600: #4A5568;
  --ink-400: #7C8898;
  --border: #E2E6EA;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Inter", sans-serif;

  --container: 1200px;
  --radius: 10px;
  --shadow-sm: 0 1px 3px rgba(10, 30, 61, 0.08);
  --shadow-md: 0 8px 24px rgba(10, 30, 61, 0.10);
  --shadow-lg: 0 20px 48px rgba(10, 30, 61, 0.16);
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink-900);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--navy-900);
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 4.5vw, 3.4rem); font-weight: 700; }
h2 { font-size: clamp(1.7rem, 3vw, 2.3rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }

p { margin: 0 0 1em; color: var(--ink-600); }

a { color: var(--blue-600); text-decoration: none; }
a:hover { color: var(--blue-500); }

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

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

/* Skip link / accessibility */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--navy-900);
  color: var(--white);
  padding: 12px 20px;
  z-index: 1000;
}
.skip-link:focus { left: 16px; top: 16px; }

:focus-visible {
  outline: 3px solid var(--blue-500);
  outline-offset: 2px;
}

/* =========================
   Eyebrow / blueprint labels
   ========================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue-600);
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--blue-600);
}
.eyebrow .coord {
  color: var(--silver-500);
  font-weight: 500;
  letter-spacing: 0.05em;
}

/* =========================
   Buttons
   ========================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 14px 26px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--blue-600);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--blue-500);
  color: var(--white);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.35);
  color: var(--white);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  color: var(--white);
}
.btn-outline-navy {
  background: transparent;
  border-color: var(--border);
  color: var(--navy-900);
}
.btn-outline-navy:hover {
  border-color: var(--blue-600);
  color: var(--blue-600);
}

/* =========================
   Header / Nav
   ========================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: var(--container);
  margin: 0 auto;
  gap: 24px;
}
.logo-link { display: flex; align-items: center; }
.logo-link img { height: 34px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 500;
}
.nav-links a {
  color: var(--ink-900);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--blue-600);
  border-bottom-color: var(--blue-600);
}

.nav-cta { display: flex; align-items: center; gap: 16px; }
.nav-cta .btn { padding: 11px 20px; font-size: 0.9rem; }
.nav-cta .btn-primary { background: var(--navy-900); }
.nav-cta .btn-primary:hover { background: var(--blue-600); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle svg { width: 26px; height: 26px; color: var(--navy-900); }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-cta .btn-label { display: none; }
  .nav-toggle { display: block; }
}

/* Mobile menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px 20px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--navy-900);
  font-family: var(--font-display);
  font-weight: 500;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

/* =========================
   Hero
   ========================= */
.hero {
  position: relative;
  background: linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 55%, var(--navy-700) 100%);
  color: var(--white);
  overflow: hidden;
}
.hero-grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.9), transparent 85%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding: 90px 24px 80px;
  max-width: var(--container);
  margin: 0 auto;
}
.hero h1 { color: var(--white); margin-bottom: 20px; }
.hero .eyebrow { color: var(--silver-300); }
.hero .eyebrow::before { background: var(--blue-500); }
.hero-lead {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.78);
  max-width: 46ch;
  margin-bottom: 32px;
}
.hero-cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 40px; }

.hero-stats {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 24px;
}
.hero-stat { display: flex; align-items: flex-start; gap: 10px; max-width: 190px; }
.hero-stat svg { flex-shrink: 0; width: 20px; height: 20px; color: var(--blue-500); margin-top: 2px; }
.hero-stat span { font-size: 0.92rem; color: rgba(255,255,255,0.85); }

.hero-visual {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: var(--shadow-lg);
}
.hero-visual img { width: 100%; height: auto; display: block; }
.hero-visual-tag {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: rgba(10,30,61,0.85);
  backdrop-filter: blur(4px);
  color: var(--white);
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.15);
}

@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; padding-top: 56px; }
}

/* =========================
   Section scaffolding
   ========================= */
section { padding: 88px 0; }
.section-alt { background: var(--silver-100); }
.section-navy { background: var(--navy-900); color: var(--white); }
.section-navy h2 { color: var(--white); }
.section-navy p { color: rgba(255,255,255,0.75); }
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* =========================
   Cards — services
   ========================= */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .grid-3 { grid-template-columns: 1fr; } }

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--blue-100);
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--blue-100);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.card-icon svg { width: 24px; height: 24px; color: var(--blue-600); }
.card h3 { margin-bottom: 10px; }
.card ul { margin: 16px 0 0; padding: 0; list-style: none; }
.card ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 0.95rem;
  color: var(--ink-600);
}
.card ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 1px;
  background: var(--blue-600);
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
}

/* =========================
   Process — numbered steps
   ========================= */
.process-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}
@media (max-width: 900px) { .process-rail { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .process-rail { grid-template-columns: 1fr; } }

.process-step { position: relative; }
.process-num {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--blue-600);
  border: 1px solid var(--blue-100);
  background: var(--blue-100);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.process-step h3 { margin-bottom: 8px; font-size: 1.05rem; }
.process-step p { font-size: 0.92rem; margin-bottom: 0; }

/* =========================
   Why us / features
   ========================= */
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
@media (max-width: 900px) { .grid-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .grid-4 { grid-template-columns: 1fr; } }

.feature-tile {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 22px;
  text-align: left;
}
.feature-tile svg { width: 26px; height: 26px; color: var(--blue-600); margin-bottom: 14px; }
.feature-tile h3 { font-size: 1rem; margin-bottom: 6px; }
.feature-tile p { font-size: 0.9rem; margin-bottom: 0; }

/* =========================
   CTA band
   ========================= */
.cta-band {
  background: linear-gradient(120deg, var(--navy-900), var(--blue-600));
  color: var(--white);
  border-radius: 16px;
  padding: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-band h2 { color: var(--white); margin-bottom: 8px; }
.cta-band p { color: rgba(255,255,255,0.8); margin-bottom: 0; max-width: 46ch; }

/* =========================
   FAQ accordion
   ========================= */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--white);
}
.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--navy-900);
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--blue-600);
  transition: transform 0.2s ease;
  flex-shrink: 0;
  margin-left: 12px;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-answer { padding: 0 22px 20px; color: var(--ink-600); font-size: 0.95rem; }

/* =========================
   Blog cards
   ========================= */
.blog-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  background: var(--white);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.blog-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.blog-card .eyebrow { font-size: 0.7rem; }
.blog-card h3 { margin-bottom: 10px; }
.blog-card p { font-size: 0.92rem; }
.read-more { font-family: var(--font-display); font-weight: 600; font-size: 0.9rem; }

/* =========================
   Footer
   ========================= */
.site-footer { background: var(--navy-900); color: rgba(255,255,255,0.7); padding: 64px 0 28px; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
@media (max-width: 700px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid img { height: 30px; margin-bottom: 16px; }
.footer-grid p { color: rgba(255,255,255,0.6); font-size: 0.92rem; }
.footer-grid h4 {
  color: var(--white);
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a { color: rgba(255,255,255,0.7); font-size: 0.94rem; }
.footer-grid a:hover { color: var(--white); }
.footer-contact-item { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; font-size: 0.94rem; }
.footer-contact-item svg { width: 17px; height: 17px; color: var(--blue-500); flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }