:root {
  --bg: #fbfaf7;
  --ink: #0f1d2e;
  --muted: #4a5a6e;
  --accent: #0a6b3b;
  --accent-ink: #ffffff;
  --line: #e7e3d8;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.btn {
  display: inline-block;
  padding: 0.625rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background 120ms ease,
    color 120ms ease,
    border-color 120ms ease;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: #08552f;
}

.btn-secondary {
  background: #fff;
  color: var(--ink);
  border-color: var(--ink);
}

.btn-secondary:hover {
  background: var(--ink);
  color: #fff;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.hero h1 {
  font-size: 2.25rem;
  line-height: 1.15;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero p {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 1.5rem;
  max-width: 60ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.systems {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}

.systems h2 {
  font-size: 1.5rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.systems > p {
  color: var(--muted);
  margin: 0 0 1rem;
  max-width: 65ch;
}

.systems-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.75rem;
}

.systems-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.systems-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--accent);
  letter-spacing: -0.01em;
}

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

@media (max-width: 720px) {
  .systems-grid {
    grid-template-columns: 1fr;
  }
}

.contact {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}

.contact h2 {
  font-size: 1.5rem;
  margin: 0 0 0.5rem;
}

.contact p {
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  background: #fff;
}

.field input:focus,
.field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.hp {
  position: absolute;
  left: -9999px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--ink);
}

@media (max-width: 560px) {
  .site-header {
    padding: 0.75rem 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .brand {
    flex-basis: 100%;
  }
  .header-actions {
    flex-basis: 100%;
    justify-content: flex-start;
  }
  .btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
  }
  .hero h1 {
    font-size: 1.75rem;
  }
}