.brikks-rail {
     --rail-top-offset: 120px;
  --rail-bottom-offset: 120px;
  --rail-collapsed-width: 62px;
  --rail-expanded-width: 208px;
  --rail-item-gap: 10px;
  position: fixed;
   top: var(--rail-top-offset, 30px);
  bottom: var(--rail-bottom-offset, 30px);
  left: 0;
  width: var(--rail-collapsed-width);
  box-sizing: border-box;
  background: rgba(2, 6, 23, 0.92);
  border: none;
  border-radius: 0 16px 16px 0;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(6px);
  z-index: 950;
  display: none;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
  transition:
    width 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

.brikks-rail.is-visible {
  display: flex;
}

.brikks-rail.is-expanded {
  width: var(--rail-expanded-width);
}

.rail-inner {
  display: flex;
  flex-direction: column;
   justify-content: flex-start;
  align-items: stretch;
  gap: var(--rail-item-gap);
  padding: 16px 0 18px;
  height: 100%;
  border-right: 1px solid rgba(148,163,184,0.35);
border-radius: 0 16px 16px 0;
border-top: 1px solid rgba(148,163,184,0.35);
border-bottom: 1px solid rgba(148,163,184,0.35);
 overflow: hidden;
}

.rail-items {
  display: flex;
  flex-direction: column;
   gap: var(--rail-item-gap);
  padding: 0 10px;
  margin: 0;
}

.rail-item {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  color: #e5e7eb;
  text-decoration: none;
   border: 1px solid rgba(148, 163, 184, 0.26);
  background: rgba(15, 23, 42, 0.88);
  border-radius: 14px;
  position: relative;
  cursor: pointer;
   width: 100%;
   box-sizing: border-box;
  overflow: hidden;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    box-shadow 160ms ease,
    transform 120ms ease;
}

.brikks-rail:not(.is-expanded) .rail-item {
  grid-template-columns: 1fr;
  justify-items: center;
  gap: 0;
  padding: 10px 8px;
}

.rail-item:hover {
  background: rgba(148, 163, 184, 0.12);
  border-color: rgba(148, 163, 184, 0.16);
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.6);
  transform: translateY(-0.5px);
}

.rail-item.is-active {
  background: rgba(148, 163, 184, 0.12);
  border-color: #22d3ee;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.6);
  transform: translateY(-0.5px);
}

.rail-icon {

  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #0ea5e9;
  font-size: 18px;
  transition:
    color 140ms ease,
    text-shadow 140ms ease;
}

.rail-icon.rail-icon-letter {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: #e5e7eb;
}

.rail-item:hover .rail-icon,
.rail-item.is-active .rail-icon {
  color: hsl(200, 95%, 82%);
  text-shadow:
    0 0 4px rgba(56, 189, 248, 0.45),
    0 0 6px rgba(168, 85, 247, 0.35);
}

.rail-label {
  opacity: 0;
  transform: translateX(-6px);
  white-space: nowrap;
  font-weight: 600;
  letter-spacing: 0.01em;
  font-size: 12px;
  transition:
    opacity 140ms ease,
    transform 140ms ease;
}

.brikks-rail.is-expanded .rail-label {
  opacity: 1;
  transform: translateX(0);
}

.brikks-rail:not(.is-expanded) .rail-label,
.brikks-rail:not(.is-expanded) .rail-pill {
  display: none;
}

.rail-pill {
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(14, 165, 233, 0.16);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: #cffafe;
  font-size: 11px;
  text-align: center;
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateX(-4px);
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.brikks-rail.is-expanded .rail-pill {
  opacity: 1;
  transform: translateX(0);
}

.rail-footer {
  margin-top: auto;
  padding: 8px 10px;
  display: flex;
  justify-content: flex-start;
}

.rail-collapsed .rail-label,
.rail-collapsed .rail-pill {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 1024px) {
  .brikks-rail {
    display: none !important;
  }
}