:root {
  --blue: #2f5bea;
  --blue-dark: #1e3fae;
  --green: #2fbf8f;
  --dark: #11151c;
  --gray: #5b6472;
  --light-bg: #f6f8fc;
  --border: #e6eaf2;
  --radius: 14px;
  --max-w: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: var(--dark);
  line-height: 1.6;
  background: #fff;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); }
h1.section-label, h2.section-label {
  color: var(--green);
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-size: 1.68rem;
  margin-bottom: 12px;
  display: block;
}
.section-title {
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.2;
  margin: 0 0 16px;
  color: var(--dark);
}
.lead { color: var(--gray); font-size: .98rem; max-width: 680px; }

/* Buttons */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--dark); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }

/* Header */
header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
}
.logo {
  display: flex;
  align-items: center;
}
.logo-img { height: 28px; width: auto; display: block; }
.footer-grid .logo-img { height: 26px; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--dark); font-weight: 500; font-size: .95rem; }
.nav-links a:hover { color: var(--blue); }
.nav-links .btn-primary, .nav-links .btn-primary:hover { color: #fff; }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; }

/* Hero */
.hero {
  background: radial-gradient(1200px 600px at 80% -10%, #eaf0ff 0%, #ffffff 60%);
  padding: 72px 0 40px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 48px;
  align-items: center;
}
.hero-grid > div:first-child { display: flex; flex-direction: column; }
.hero-grid > div:first-child .section-label { order: -1; }
.hero h1.hero-tagline { font-size: 1.5rem; font-weight: 500; color: var(--dark); margin: 0 0 14px; }
.hero .lead { margin-bottom: 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-image {
  display: flex;
  justify-content: center;
}
.hero-image img { border-radius: 8px; height: auto; }

.stat-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}
.stat-bar div { text-align: left; }
.stat-bar strong { display: block; font-size: 1.5rem; color: var(--blue); }
.stat-bar span { color: var(--gray); font-size: .85rem; }

/* Generic section */
section { padding: 48px 0; scroll-margin-top: 80px; }
.alt-bg { background: var(--light-bg); }

/* Feature grid */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 36px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 36px; }
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.card .icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: #e3f2fd;
  margin-bottom: 16px;
  display: flex; align-items: center; justify-content: center;
  color: var(--blue); font-size: 1.3rem;
}
.card h3 { font-size: 1.25rem; }
.card p { color: var(--gray); font-size: .9rem; margin: 0; }

/* Models */
.model-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
}
.model-card .badge {
  align-self: flex-start;
  background: #eaf0ff;
  color: var(--blue);
  font-size: .75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.model-card h3 { font-size: 1.4rem; }
.model-card p { color: var(--gray); font-size: .9rem; margin: 0; }
.model-card ul { padding-left: 18px; color: var(--gray); font-size: .9rem; margin: 14px 0 0; }
.model-card li { margin-bottom: 6px; }

/* Sensor pills */
.pill-grid { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: .9rem;
  font-weight: 600;
  color: var(--dark);
  background: #fff;
}
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); display: inline-block; margin-right: 8px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 36px; counter-reset: step; }
.step { position: relative; padding-top: 8px; }
.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--dark);
  color: #fff;
  font-weight: 700;
  margin-bottom: 14px;
}
.step h3 { font-size: 1.1rem; }
.step p { color: var(--gray); font-size: .88rem; }

/* CTA / Contact */
.cta-box {
  background: linear-gradient(135deg, var(--blue), #18307f);
  border-radius: 20px;
  padding: 48px;
  color: #fff;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 32px;
  align-items: center;
}
.cta-box h2 { color: #fff; }
.cta-box .lead { color: #d8e1ff; }
.cta-box .btn-primary { background: #fff; color: var(--blue-dark); }
.cta-box .btn-primary:hover { background: #eef2ff; }

.contact-form { display: flex; flex-direction: column; gap: 12px; }
.contact-form input, .contact-form textarea {
  padding: 12px 14px;
  border-radius: 10px;
  border: none;
  font-family: inherit;
  font-size: .95rem;
}
.contact-form textarea { resize: vertical; min-height: 80px; }

/* Footer */
footer { background: var(--light-bg); color: var(--gray); padding: 56px 0 28px; border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr 1fr; gap: 32px; }
.footer-grid h4 { color: var(--dark); font-size: .95rem; margin-bottom: 14px; }
.footer-grid a { color: var(--gray); display: block; margin-bottom: 8px; font-size: .9rem; }
.footer-grid a:hover { color: var(--blue); }
.footer-bottom {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding-top: 20px;
  font-size: .85rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* Blog */
.blog-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 36px; }
.blog-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  background: #fff;
}
.blog-card .tag { color: var(--green); font-size: .78rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; }
.blog-card h3 { margin: 10px 0; font-size: 1.25rem; }
.blog-card p { color: var(--gray); font-size: .9rem; }
.article { max-width: 740px; margin: 0 auto; padding: 56px 24px 80px; }
.article h1 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); }
.article .meta { color: var(--gray); font-size: .88rem; margin-bottom: 28px; }
.article h2 { font-size: 1.4rem; margin-top: 36px; }
.article p { color: #333a47; }
.article ul { color: #333a47; }
.back-link { display: inline-block; margin-bottom: 20px; font-weight: 600; }

.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--dark); padding: 8px; }

@media (max-width: 900px) {
  .hero-grid, .grid-3, .grid-2, .steps, .footer-grid, .cta-box, .blog-grid { grid-template-columns: 1fr; }
  .stat-bar { grid-template-columns: repeat(2, 1fr); }
  .nav-toggle { display: block; }
  .nav-links { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: #fff; padding: 20px 24px; border-bottom: 1px solid var(--border); box-shadow: 0 4px 12px rgba(0,0,0,.08); gap: 16px; }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1rem; }
}

/* Contact form extras */
.captcha-row { display: flex; align-items: center; gap: 12px; background: rgba(0,0,0,.08); padding: 12px; border-radius: 8px; margin-bottom: 12px; }
.captcha-row span { font-weight: 700; font-size: 1.1rem; color: #fff; white-space: nowrap; }
.captcha-row input { max-width: 80px; padding: 10px; border-radius: 8px; border: none; font-size: 1rem; text-align: center; }
.contact-form select { padding: 12px 14px; border-radius: 10px; border: none; font-family: inherit; font-size: .95rem; width: 100%; margin-bottom: 12px; }
.form-msg { margin-top: 12px; padding: 12px; border-radius: 8px; font-size: .9rem; }
.form-msg.success { background: #d4edda; color: #155724; }
.form-msg.error { background: #f8d7da; color: #721c24; }