/* =========================
   Topics: hero with reading rail
   ========================= */

.topics-hero{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 14px;
  align-items: stretch;
}

.hero-glass--compact{
  padding: 18px 18px;
}

.topics-hero-actions{
  display:flex;
  gap:10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.topics-rail{
  /*display:grid;*/
  grid-template-rows: 1fr 1fr;
  gap: 12px;
}

.rail-card{
  border-radius: var(--radius-xl);
  border: 1px solid rgba(15,23,42,0.10);
  background: rgba(255,255,255,0.85);
  box-shadow: 0 16px 36px rgba(15,23,42,0.08);
  overflow:hidden;
}

.rail-head{
  padding: 12px 14px;
  display:flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid rgba(15,23,42,0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.82));
}

.rail-title{
  font-weight: 950;
  letter-spacing: -0.02em;
}

.rail-sub{
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.rail-list{
  display:grid;
  gap: 0;
}

.rail-item{
  display:block;
  padding: 10px 14px;
  text-decoration:none;
  color: inherit;
  border-top: 1px solid rgba(15,23,42,0.06);
  position: relative;
  transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}

.rail-item:first-child{ border-top: 0; }

.rail-tag{
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted2);
  margin-bottom: 4px;
}

.rail-item-title{
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.25;
  font-size: 13px;
  color: var(--accent);
}

.rail-item:hover,
.rail-item:focus-visible{
  background: rgba(15,98,254,0.06);
  transform: translateY(-1px);
  box-shadow: inset 0 0 0 1px rgba(15,98,254,0.12);
}

.rail-empty{
  padding: 12px 14px;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 980px){
  .topics-hero{
    grid-template-columns: 1fr;
  }
  .topics-rail{
    grid-template-rows: auto;
    grid-template-columns: 1fr;
  }
}
/* =========================
   Topics rail tabs
   ========================= */

.rail-card--tabs{
  overflow: hidden;
}

.rail-tabs{
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid rgba(15,23,42,0.08);
  background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.82));
}

.rail-tab{
  appearance: none;
  border: 0;
  background: transparent;
  padding: 12px 14px;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font-weight: 950;
  letter-spacing: -0.01em;
  position: relative;
  transition: background .18s ease, transform .18s ease;
  outline: none;
}

.rail-tab-sub{
  display: block;
  margin-top: 2px;
  font-weight: 700;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0;
}

.rail-tab:hover{
  background: rgba(15,98,254,0.06);
}

.rail-tab.is-active{
  background: rgba(15,98,254,0.08);
}

.rail-tab.is-active::after{
  content:"";
  position:absolute;
  left: 12px;
  right: 12px;
  bottom: -1px;
  height: 2px;
  border-radius: 999px;
  background: rgba(15,98,254,0.65);
}

.rail-panel{
  display: none;
}

.rail-panel.is-active{
  display: block;
}

/* Mobile polish */
@media (max-width: 980px){
  .topics-hero{
    grid-template-columns: 1fr;
  }
}