:root {
  --primary: #0f4c81;
  --secondary: #2a9d8f;
  --accent: #e9c46a;
  --background: #f8f9fa;
  --text: #1a2530;
}

body {
  color: var(--text);
  background: var(--background);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topographic-bg {
  background-color: var(--background);
  background-image:
    linear-gradient(rgba(15, 76, 129, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 76, 129, 0.05) 1px, transparent 1px),
    radial-gradient(circle at 20% 15%, rgba(42, 157, 143, 0.13), transparent 28%),
    radial-gradient(circle at 80% 0%, rgba(233, 196, 106, 0.16), transparent 24%);
  background-size: 36px 36px, 36px 36px, 100% 100%, 100% 100%;
}

.contour-panel {
  position: relative;
  overflow: hidden;
}

.contour-panel::before {
  background:
    repeating-radial-gradient(
      circle at 25% 30%,
      rgba(42, 157, 143, 0.13) 0,
      rgba(42, 157, 143, 0.13) 1px,
      transparent 2px,
      transparent 18px
    );
  content: "";
  inset: 0;
  opacity: 0.55;
  pointer-events: none;
  position: absolute;
}

.engineering-card {
  background: #ffffff;
  border: 1px solid rgba(15, 76, 129, 0.1);
  border-radius: 8px;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05);
}

.image-placeholder {
  align-items: center;
  background:
    linear-gradient(135deg, rgba(15, 76, 129, 0.14), rgba(42, 157, 143, 0.12)),
    linear-gradient(rgba(255, 255, 255, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.3) 1px, transparent 1px);
  background-size: auto, 22px 22px, 22px 22px;
  color: var(--primary);
  display: flex;
  font-weight: 700;
  justify-content: center;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-link {
  color: rgba(26, 37, 48, 0.8);
  font-weight: 600;
  transition: color 160ms ease;
}

.nav-link:hover {
  color: var(--secondary);
}

.btn-primary {
  background: var(--accent);
  border-radius: 8px;
  color: var(--text);
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.btn-primary:hover {
  box-shadow: 0 12px 24px -16px rgba(26, 37, 48, 0.5);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--primary);
  border-radius: 8px;
  color: #ffffff;
  font-weight: 700;
  transition: background 160ms ease;
}

.btn-secondary:hover {
  background: #0b3c66;
}

.form-field {
  border: 1px solid rgba(15, 76, 129, 0.18);
  border-radius: 8px;
  color: var(--text);
  outline: none;
  padding: 0.75rem 0.9rem;
  width: 100%;
}

.form-field:focus {
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(42, 157, 143, 0.15);
}

.file-upload-control {
  align-items: center;
  background: #ffffff;
  border: 1px solid rgba(15, 76, 129, 0.1);
  border-radius: 8px;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.04);
  color: var(--primary);
  cursor: pointer;
  display: inline-flex;
  font-size: 0.875rem;
  font-weight: 700;
  justify-content: center;
  overflow: hidden;
  padding: 0.75rem 1rem;
  position: relative;
}

.file-upload-control:hover {
  color: var(--secondary);
}

.file-upload-control input[type="file"] {
  cursor: pointer;
  inset: 0;
  opacity: 0;
  position: absolute;
  width: 100%;
}