:root {
  --sr-w: 44px;
  --sr-h: 240px;
  --sr-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --sr-dur: var(--sb-collapse-dur, 400ms);
  --sr-sb-ease: var(--sb-collapse-ease, cubic-bezier(0.4, 0, 0.2, 1));
}

.sess-rail {
  position: fixed;
  top: 50%;
  inset-inline-start: calc(var(--sidebar-w, 264px) + 3px);
  z-index: calc(var(--z-sidebar) - 1);
  width: var(--sr-w);
  height: var(--sr-h);
  margin-top: calc(var(--sr-h) / -2);
  overflow: hidden; /* جایگزین clip-path — ارزان و روی compositor */
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    inset-inline-start var(--sr-dur) var(--sr-sb-ease),
    opacity 0.35s var(--ease),
    visibility 0s linear 0.35s;
}
.sess-rail.on {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition:
    inset-inline-start var(--sr-dur) var(--sr-sb-ease),
    opacity 0.35s var(--ease),
    visibility 0s;
}

.sr-body {
  position: absolute;
  inset: 0;
  transform: translateX(-20px);
  opacity: 0;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.35s ease;
  will-change: transform, opacity;
}
.sess-rail.on .sr-body {
  transform: none;
  opacity: 1;
}

.sr-face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  /* scaleX animation حذف شد — با translateX والد ترکیب و روی compositor انجام می‌شود */
}
.sr-face path {
  fill: var(--surf-solid, var(--bg-2));
  stroke: none;
}


.sr-wheel {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  scrollbar-width: none;
  -ms-overflow-style: none;
  touch-action: pan-y;
  -webkit-overflow-scrolling: touch;
  clip-path: var(--sr-clip);
  -webkit-mask-image: linear-gradient(
    to bottom,
    transparent 0%,
    #000 20%,
    #000 80%,
    transparent 100%
  );
  mask-image: linear-gradient(to bottom, transparent 0%, #000 20%, #000 80%, transparent 100%);
}
.sr-wheel::-webkit-scrollbar {
  display: none;
}
.sr-list {
  position: relative;
  margin: 0;
  padding: 0 4px 0 0;
  list-style: none;
}
.sr-li {
  height: 30px;
}
.sr-i {
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: var(--text-tertiary);
  transition:
    opacity 0.6s var(--sr-ease),
    color 0.3s var(--ease);
}
.sr-i span {
  position: relative;
  isolation: isolate;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 9px;
  font-size: 11px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  transition:
    transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
    color 0.3s var(--ease),
    box-shadow 0.42s var(--ease);
}
.sr-i span::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--ac), var(--ac-2));
  opacity: 0;
  z-index: -1;
  transition: opacity 0.32s var(--ease);
}
.sr-i.is-cur span::before {
  opacity: 1;
}
.sr-i:hover {
  color: var(--text-primary);
}
.sr-i:hover span {
  transform: scale(1.06);
}
.sr-i:focus-visible {
  outline: none;
}
.sr-i:focus-visible span {
  outline: var(--ring-width) solid var(--focus-ring);
  outline-offset: 2px;
}
.sr-i.is-cur {
  color: var(--text-on-accent);
}
.sr-i.is-cur span {
  font-weight: 700;
  box-shadow:
    0 0 0 4px color-mix(in srgb, var(--ac) 14%, transparent),
    0 8px 16px -8px var(--ac);
}

@media (max-width: 1000px) {
  .sess-rail {
    display: none;
  }
}
.sr-i--dummy {
  pointer-events: none;
  cursor: default;
}
.sr-i--dummy span {
  width: 6px !important;
  height: 6px !important;
  border-radius: 50%;
  background: var(--text-tertiary);
  opacity: 0.3;
  box-shadow: none !important;
  transition: opacity 0.3s ease;
}

@media (prefers-reduced-motion: reduce) {
  .sess-rail,
  .sr-face,
  .sr-list,
  .sr-i {
    transition-duration: 0.01ms !important;
  }
}