/* Mbuma Labs Design System — Dense, Documentary, Proof-Oriented */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --color-primary: #1F6B4F;
  --color-primary-hover: #154b37;
  --color-sand: #EADFC8;
  --color-sand-light: #F7F4EC;
  --color-dark: #0F172A;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
  --color-white: #FFFFFF;
  --color-bg-light: #F8FAFC;
  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --radius-sm: 6px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: #FFFFFF;
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-hover);
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: 760px;
}

/* HEADER & NAV */
.site-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.85rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--color-dark);
}

.brand-logo .logo-mark {
  background: var(--color-primary);
  color: var(--color-white);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.brand-logo .labs-tag {
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--color-sand);
  color: var(--color-primary);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  align-items: center;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

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

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

.btn-secondary {
  background: #F1F5F9;
  color: var(--color-dark);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: #E2E8F0;
}

.btn-block {
  width: 100%;
}

.btn-sm {
  font-size: 0.8rem;
  padding: 0.45rem 0.9rem;
}

/* BADGES */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-sand {
  background: var(--color-sand-light);
  color: var(--color-primary);
  border: 1px solid var(--color-sand);
}

.badge-available {
  background: #ECFDF5;
  color: #047857;
  border: 1px solid #A7F3D0;
}

/* SECTIONS & CARDS */
.section {
  padding: 4rem 0;
}

.section-light {
  background: var(--color-bg-light);
}

.section-dark {
  background: var(--color-dark);
  color: var(--color-white);
}

.hero {
  padding: 4rem 0 3rem 0;
}

.hero-title {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-dark);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1.75rem;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.card-sand {
  background: var(--color-sand-light);
  border-color: var(--color-sand);
}

/* FOOTER */
.site-footer {
  background: var(--color-dark);
  color: #94A3B8;
  padding: 3.5rem 0 2rem 0;
  font-size: 0.875rem;
  border-top: 1px solid #1E293B;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-col h5 {
  color: var(--color-white);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: #94A3B8;
}

.footer-links a:hover {
  color: var(--color-sand);
}

.footer-bottom {
  border-top: 1px solid #1E293B;
  padding-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* RESPONSIVE MOBILE (Directive Brief #26) */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
  .nav-links {
    width: 100%;
    justify-content: flex-start;
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 0.25rem;
  }
  .hero-title {
    font-size: 1.85rem;
  }
  .cards-grid {
    grid-template-columns: 1fr;
  }
  .form-group {
    margin-bottom: 1.25rem;
  }
  .form-control, select, textarea {
    width: 100%;
    font-size: 1rem; /* Prevent iOS zoom */
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
}