.selector{
  background: var(--color-bg);
}
.selector-layout{
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: stretch;
}

.selector-list{
  display: flex;
  flex-direction: column;
  border-top: 1.5px solid var(--color-line-strong);
}
.selector-item{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: clamp(1rem, 2.4vw, 1.6rem) 0.2rem;
  border-bottom: 1.5px solid var(--color-line-strong);
  cursor: pointer;
  background: none;
  border-inline: 0;
  border-top: 0;
  width: 100%;
  text-align: right;
  transition: padding-inline-start var(--dur-fast) var(--ease-out);
}
.selector-item:hover,
.selector-item:focus-visible{ padding-inline-start: 0.8rem; }
.selector-item .num{
  font-size: 0.9rem;
  color: var(--color-muted);
  min-width: 2.4ch;
}
.selector-item .label{
  flex: 1;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.6vw, 2rem);
  letter-spacing: -0.01em;
  color: var(--color-muted);
  transition: color var(--dur-fast);
}
.selector-item.is-active .label,
.selector-item:hover .label{ color: var(--color-black); }
/* The arrow is a REAL link straight to the course page (not just a tab-
   switch indicator) — only interactive/visible/focusable while its item is
   the active tab, so keyboard users don't tab through 5 invisible links. */
.selector-item-link{
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px; height: 26px;
  color: inherit;
  opacity: 0;
  visibility: hidden;
  transform: translateX(6px);
  transition: opacity var(--dur-fast), transform var(--dur-fast), visibility 0s linear var(--dur-fast);
  flex: 0 0 auto;
}
.selector-item-link svg{ width: 100%; height: 100%; }
.selector-item.is-active .selector-item-link{
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  transition: opacity var(--dur-fast), transform var(--dur-fast), visibility 0s;
}
.selector-item.is-active{ padding-inline-start: 0.8rem; }

.selector-visual{
  position: relative;
  overflow: hidden;
  background: var(--color-dark);
  min-height: 340px;
  border-radius: 16px; /* same physical-card language as .lesson-card */
}
.selector-visual-item{
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s var(--ease-out);
}
.selector-visual-item.is-active{
  opacity: 1;
  visibility: visible;
}
.selector-visual-item img{
  width: 100%; height: 100%;
  object-fit: cover;
}
.selector-visual-item::after{
  content:'';
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(17,17,17,0.85), rgba(17,17,17,0) 55%);
}
.selector-visual-meta{
  position: absolute;
  z-index: 2;
  right: 1.4rem; bottom: 1.4rem; left: 1.4rem;
  color: var(--color-white);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}
.selector-visual-meta .course-num{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.85rem;
  color: var(--color-lime);
  letter-spacing: 0.05em;
}
.selector-visual-meta .mini-cta{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1.5px solid currentColor;
}

@media (max-width: 900px){
  .selector-layout{ grid-template-columns: 1fr; }
  .selector-visual{ min-height: 260px; order: -1; }
}