html { scroll-behavior: smooth; }
.nav-link.active { color: #6BA5F2; }

/* Modal overlay */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0,0,0,0.5);
  align-items: center;
  justify-content: center;
}
.modal-overlay.open {
  display: flex;
}
.modal-card {
  background: white;
  border-radius: 0.75rem;
  max-width: 640px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2rem;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #999;
  line-height: 1;
  padding: 0.25rem;
}
.modal-close:hover { color: #333; }
.modal-card h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; }
.modal-card h3 { font-size: 1.1rem; font-weight: 600; margin-top: 1.25rem; margin-bottom: 0.5rem; }
.modal-card p, .modal-card li { font-size: 0.875rem; color: #555; line-height: 1.7; }
.modal-card ul { list-style: disc; padding-left: 1.25rem; margin-bottom: 0.75rem; }

/* Language dropdown */
.lang-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.25rem;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  overflow: hidden;
  z-index: 60;
}
.lang-dropdown.open { display: block; }
.lang-option {
  display: block;
  width: 100%;
  padding: 0.5rem 1.25rem;
  text-align: left;
  font-size: 0.875rem;
  font-weight: 500;
  color: #555;
  background: none;
  border: none;
  cursor: pointer;
  white-space: nowrap;
}
.lang-option:hover { background: #F0F6FF; color: #1A1A1A; }
.lang-option.active { color: #6BA5F2; font-weight: 600; }

/* Stack section */
.stack-bubble {
  border-radius: 1.75rem;
}
.stack-detail {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
}