/* Override theme variables for both light & dark modes */
:root,
[data-theme="light"],
[data-theme="dark"] {
  /* Primary brand color overrides (Jupyter Book / pydata-sphinx-theme) */
  --pst-color-primary: #6b7280;           /* mid grey */
  --pst-color-primary-text: #ffffff;      /* text on primary */
  --pst-color-link: #6b7280;              /* link color */
  --pst-color-link-hover: #374151;        /* darker grey on hover */
  --pst-color-secondary: #6b7280;

  /* Bootstrap variables used by theme */
  --bs-primary: #6b7280;
  --bs-primary-rgb: 107, 114, 128; /* 6b7280 */
  --bs-link-color: #6b7280;
  --bs-link-hover-color: #374151;

  /* Sphinx-design button colors */
  --sd-color-primary: #6b7280;
  --sd-color-primary-text: #ffffff;
}

/* Navbar links */
.navbar .navbar-nav .nav-link,
.bd-header .navbar .nav-link {
  color: var(--bs-link-color) !important;
}

/* Optional: tweak active/hover states in navbar */
.navbar .nav-link:hover,
.navbar .nav-link:focus,
.navbar .nav-link.active,
.bd-sidebar .nav .active > .nav-link,
.bd-sidebar .nav .nav-link:hover {
  color: var(--pst-color-link-hover) !important;
}

a { color: var(--pst-color-link) !important; }
a:hover { color: var(--pst-color-link-hover) !important; }

/* Feature grid on landing page */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1rem 0 2rem 0;
}

.feature-card {
  position: relative;
  padding: 1.25rem 1.5rem;
  border-radius: 14px;
  border: 1px solid rgba(0,0,0,0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.75), rgba(255,255,255,0.55))
              , radial-gradient(1200px 400px at 0% 0%, rgba(107,114,128,0.10), transparent)
              , radial-gradient(900px 300px at 100% 100%, rgba(55,65,81,0.10), transparent);
  box-shadow: 0 8px 18px rgba(0,0,0,0.06);
  transition: transform .12s ease, box-shadow .2s ease;
}

.feature-card:hover { transform: translateY(-2px); box-shadow: 0 14px 26px rgba(0,0,0,0.10); }
.feature-card h3 { margin: 0 0 .35rem 0; font-weight: 700; }
.feature-card p { margin: 0; color: #111827; }
.feature-card .kicker { text-transform: uppercase; letter-spacing: .06em; font-size: .72rem; color: #6b7280; margin-bottom: .2rem; }

.feature-card a.stretched { position: absolute; inset: 0; border-radius: 14px; }

/* Buttons and active pills */
.btn-primary,
.sd-btn.sd-btn-primary,
.btn-outline-primary:hover,
.btn-outline-primary:focus {
  background-color: var(--bs-primary) !important;
  border-color: var(--bs-primary) !important;
  color: var(--pst-color-primary-text) !important;
}

.nav-pills .nav-link.active,
.nav-pills .show > .nav-link {
  background-color: var(--bs-primary) !important;
}

/* Force link colors across content areas */
.bd-content a,
.bd-content a:visited,
.reference.internal,
.reference.external,
.sidebar .nav-link,
.bd-sidebar .nav .nav-link {
  color: #6b7280 !important;
}

.bd-content a:hover,
.bd-content a:focus,
.reference.internal:hover,
.reference.external:hover,
.bd-sidebar .nav .nav-link:hover,
.bd-sidebar .nav .active > .nav-link {
  color: #374151 !important;
  text-decoration-color: #374151 !important;
  background: none !important;
}