/* ============================================================
   RAIL TAHAP — dari referensi.
   Menempel di samping saat menggulir, menyala mengikuti posisi.
   Di HP menjadi bar horizontal di bawah nav.
   ============================================================ */

.rail-steps {
  position: sticky;
  top: 84px;
  align-self: start;
  display: grid;
  gap: 4px;
  padding: 10px;
  background: var(--surface);
  border-radius: var(--r-ui);
}

.rail-tag {
  background: var(--ink);
  color: #e8f1f7;
  border-radius: var(--r-ui);
  padding: 10px 12px;
  font-size: var(--t-small);
  margin-bottom: 8px;
}
.rail-tag span { display: block; color: #a9c2d3; font-size: 0.8125rem; font-weight: 600; }
.rail-tag b {
  display: block;
  font-family: var(--f-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-top: 1px;
}

.rail-step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--r-ui);
  color: var(--muted);
  font-size: var(--t-small);
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
  min-height: 44px;
}
.rail-step i {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  flex: none;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--ink);
  font-style: normal;
  font-size: 0.8125rem;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}
.rail-step.is-now {
  background: var(--surface-3);
  color: var(--ink);
}
.rail-step.is-now i {
  background: var(--accent);
  color: #fff;
  transform: scale(1.12);
}
.rail-step.is-done i { background: var(--ok); color: #fff; }
.rail-step:hover { background: var(--surface-2); color: var(--ink); }

/* jadikan dua kolom: rail + isi alur */
.flow-2col {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: clamp(18px, 2.4vw, 40px);
  align-items: start;
}
.flow-2col > .wrap-inner { min-width: 0; }

@media (max-width: 900px) {
  .flow-2col { grid-template-columns: 1fr; }
  .rail-steps {
    position: sticky;
    top: 62px;
    z-index: 40;
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    gap: 2px;
    padding: 6px;
    border-radius: 0;
    box-shadow: 0 8px 18px -14px rgba(16, 40, 58, 0.5);
  }
  .rail-tag { display: none; }
  .rail-step { padding: 7px 10px; font-size: 0.8125rem; }
}

@media (prefers-reduced-motion: reduce) {
  .rail-step, .rail-step i { transition: none; }
}