body { font-family: 'Inter', sans-serif; background-color: #111827; color: #d1d5db; }
.locked-table { filter: grayscale(100%); pointer-events: none; opacity: 0.5; transition: all 0.3s ease-in-out; }
.unlocked-table { filter: grayscale(0%); pointer-events: auto; opacity: 1; transition: all 0.3s ease-in-out; }
.custom-checkbox:checked { background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M12.207 4.793a1 1 0 010 1.414l-5 5a1 1 0 01-1.414 0l-2-2a1 1 0 011.414-1.414L6.5 9.086l4.293-4.293a1 1 0 011.414 0z'/%3e%3c/svg%3e"); }
.nav-link {
    color: #d1d5db;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color 0.2s, background-color 0.2s;
}
.nav-link:hover,
.nav-link:focus {
    background-color: #374151;
    color: #fff;
}
.nav-link-mobile {
    display: block;
    color: #d1d5db;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    border-radius: 0.375rem;
    font-size: 1rem;
    font-weight: 500;
    transition: color 0.2s, background-color 0.2s;
}
.nav-link-mobile:hover,
.nav-link-mobile:focus {
    background-color: #374151;
    color: #fff;
}
.nav-link.active,
.nav-link-mobile.active {
    background-color: #1f2937;
    color: #fff;
}
#mobile-menu {
    transition: max-height 0.35s ease-in-out;
    overflow: hidden;
    max-height: 0;
}
#mobile-menu.menu-open {
    max-height: 20rem;
}

.centered-video-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 65%;
  max-width: 540px;
  aspect-ratio: 16 / 9;
  margin: 0 auto; /* Horizontally center if in block flow */
}

.centered-video-container video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}