.rail {
  --rail-motion-duration: 220ms;
  --rail-motion-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --rail-fade-duration: 110ms;
  --rail-label-delay: 55ms;

  position: sticky;
  top: 0;
  width: 100%;
  height: var(--desktop-stage-height, 100dvh);
  min-height: var(--desktop-stage-height, 100dvh);
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow: visible;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 250, 252, 0.96)), #fff;
  border-right: 1px solid #dbe4ee;
  box-shadow: 1px 0 0 rgba(15, 23, 42, 0.02);
  z-index: 20;
  contain: layout;
  transform: translateZ(0);
  transition:
    background 240ms var(--ease),
    box-shadow 240ms var(--ease);
}

.rail-brand {
  position: relative;
  min-height: 112px;
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 12px;
  padding: 54px 16px 8px;
  overflow: visible;
  transition:
    min-height var(--rail-motion-duration) var(--rail-motion-ease),
    padding var(--rail-motion-duration) var(--rail-motion-ease),
    gap var(--rail-motion-duration) var(--rail-motion-ease);
  will-change: min-height, padding, gap;
}

.brand-mark {
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  color: var(--theme-primary-active);
  border-radius: 4px;
  overflow: hidden;
  transform: translateY(-8px);
  transition:
    color 160ms var(--ease),
    transform var(--rail-motion-duration) var(--rail-motion-ease);
  will-change: transform;
}

.custom-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-mark svg {
  width: 32px;
  height: 32px;
  fill: currentColor;
}

.brand-name {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 124px;
  color: #0f172a;
  font-size: 16px;
  font-weight: 800;
  white-space: nowrap;
  overflow: hidden;
  transform: translateY(-8px);
  transition:
    max-width var(--rail-motion-duration) var(--rail-motion-ease),
    opacity var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay),
    transform var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay);
  will-change: max-width, opacity, transform;
}

.rail-collapse-btn {
  position: absolute;
  right: -14px;
  top: 55px;
  z-index: 30;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border: 1px solid #dbe4ee;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.96);
  color: #64748b;
  box-shadow:
    0 8px 18px rgba(15, 23, 42, 0.12),
    0 0 0 3px rgba(248, 250, 252, 0.92);
  transition:
    top var(--rail-motion-duration) var(--rail-motion-ease),
    right var(--rail-motion-duration) var(--rail-motion-ease),
    width var(--rail-motion-duration) var(--rail-motion-ease),
    height var(--rail-motion-duration) var(--rail-motion-ease),
    transform var(--rail-motion-duration) var(--rail-motion-ease),
    background 180ms var(--ease),
    border-color 180ms var(--ease),
    color 180ms var(--ease),
    box-shadow 180ms var(--ease);
}

.rail-collapse-btn:hover {
  border-color: rgba(var(--theme-primary-rgb, 58, 124, 165), 0.28);
  background: #fff;
  color: var(--theme-primary-active);
  box-shadow:
    0 10px 22px rgba(var(--theme-primary-rgb, 58, 124, 165), 0.16),
    0 0 0 3px rgba(248, 250, 252, 0.96);
}

.rail-collapse-btn .mdi {
  font-size: 17px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.rail-collapse-btn .mdi-chevron-left {
  margin-left: 1px;
}

.rail-collapse-btn .mdi-chevron-right {
  margin-right: 1px;
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 4px 8px 16px;
  overflow-y: auto;
  overflow-x: hidden;
  flex: 1;
  transition:
    padding var(--rail-motion-duration) var(--rail-motion-ease),
    gap var(--rail-motion-duration) var(--rail-motion-ease);
  will-change: padding, gap;
}

.nav-btn {
  width: 100%;
  min-height: 48px;
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: #64748b;
  text-align: left;
  overflow: hidden;
  transition:
    gap var(--rail-motion-duration) var(--rail-motion-ease),
    background 180ms var(--ease),
    border-color 180ms var(--ease),
    color 180ms var(--ease);
  will-change: gap;
}

.nav-btn:hover {
  background: rgba(var(--theme-primary-rgb, 58, 124, 165), 0.08);
  color: var(--theme-primary-active);
}

.nav-btn.active {
  background: var(--theme-primary-soft);
  border-color: rgba(var(--theme-primary-rgb, 58, 124, 165), 0.18);
  color: var(--theme-primary-active);
}

.nav-icon {
  flex: 0 0 48px;
  width: 48px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 4px;
  color: currentColor;
  transition: color 180ms var(--ease);
}

.nav-btn :deep(svg) {
  width: 19px;
  height: 19px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-label {
  flex: 1;
  min-width: 0;
  max-width: 128px;
  color: currentColor;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  opacity: 1;
  transition:
    max-width var(--rail-motion-duration) var(--rail-motion-ease),
    opacity var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay),
    transform var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay);
  will-change: max-width, opacity, transform;
}

.nav-badge {
  flex: 0 0 auto;
  min-width: 34px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 8px;
  border-radius: 999px;
  background: #ff5b67;
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  transition:
    min-width var(--rail-motion-duration) var(--rail-motion-ease),
    max-width var(--rail-motion-duration) var(--rail-motion-ease),
    padding var(--rail-motion-duration) var(--rail-motion-ease),
    opacity var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay);
  will-change: min-width, max-width, padding, opacity;
}

.nav-unread-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border: 2px solid #fff;
  border-radius: 999px;
  background: #ef4444;
  box-shadow: 0 6px 14px rgba(239, 68, 68, 0.26);
}

.rail-user {
  position: relative;
  min-width: 0;
  min-height: 78px;
  margin: 0;
  padding: 16px 20px 18px;
  border-top: 1px solid #edf2f7;
  transition: padding var(--rail-motion-duration) var(--rail-motion-ease);
}

.user-summary {
  position: relative;
  min-width: 0;
  min-height: 42px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px;
  color: #64748b;
  border-radius: 4px;
  cursor: pointer;
  transition:
    gap var(--rail-motion-duration) var(--rail-motion-ease),
    padding var(--rail-motion-duration) var(--rail-motion-ease),
    background 180ms var(--ease);
}

.rail-user:hover .user-summary {
  background: rgba(255, 255, 255, 0.72);
}

.user-avatar {
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 2px solid #fff;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--theme-primary), var(--theme-primary-active));
  box-shadow: 0 6px 14px rgba(var(--theme-primary-rgb, 58, 124, 165), 0.18);
  color: #fff;
  font-size: 14px;
  font-weight: 800;
  transition:
    flex-basis var(--rail-motion-duration) var(--rail-motion-ease),
    width var(--rail-motion-duration) var(--rail-motion-ease),
    height var(--rail-motion-duration) var(--rail-motion-ease);
}

.user-copy {
  flex: 1;
  min-width: 0;
  max-width: 116px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  opacity: 1;
  transition:
    max-width var(--rail-motion-duration) var(--rail-motion-ease),
    opacity var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay),
    transform var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay);
  will-change: max-width, opacity, transform;
}

.user-copy strong {
  color: #334155;
  font-size: 14px;
  font-weight: 750;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-copy span {
  color: #64748b;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-summary .mdi {
  flex: 0 0 18px;
  font-size: 18px;
  transition:
    max-width var(--rail-motion-duration) var(--rail-motion-ease),
    opacity var(--rail-fade-duration) var(--rail-motion-ease) var(--rail-label-delay);
  will-change: max-width, opacity;
}

.user-menu {
  position: absolute;
  right: 20px;
  bottom: calc(100% - 6px);
  min-width: 132px;
  padding: 8px;
  border: 1px solid rgba(226, 232, 240, 0.96);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.1);
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: all 180ms var(--ease);
  z-index: 4;
}

.rail-user:hover .user-menu {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.user-menu-item {
  width: 100%;
  height: 38px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: #dc2626;
  font-size: 13px;
  font-weight: 700;
  transition: all 180ms var(--ease);
}

/* ========================================= */
/* COLLAPSED STATE                           */
/* ========================================= */

.rail-collapsed .rail-brand {
  min-height: 136px;
  justify-content: flex-start;
  gap: 0;
  padding: 52px 16px 8px;
}

.rail-collapsed .brand-mark {
  width: 32px;
  height: 32px;
  margin: 0;
  transform: translateY(-6px);
}

.rail-collapsed .brand-mark svg {
  width: 32px;
  height: 32px;
}

.rail-collapsed .brand-name {
  position: absolute;
  width: 1px;
  height: 1px;
  max-width: 0;
  margin: 0;
  opacity: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  pointer-events: none;
  transform: translateX(-6px);
  transition-delay: 0ms;
}

.rail-collapsed .rail-collapse-btn {
  top: 96px;
  right: -14px;
  width: 28px;
  height: 28px;
  transform: none;
}

.rail-collapsed .rail-nav {
  gap: 8px;
  padding: 4px 8px 16px;
}

.rail-collapsed .nav-btn {
  justify-content: flex-start;
  gap: 0;
  transform: translateX(0);
}

.rail-collapsed .nav-icon {
  width: 48px;
  height: 36px;
  flex: 0 0 48px;
  transform: translateX(0);
}

.rail-collapsed .nav-label {
  max-width: 0;
  opacity: 0;
  transform: translateX(-6px);
  transition-delay: 0ms;
}

.rail-collapsed .nav-badge {
  max-width: 0;
  min-width: 0;
  padding: 0;
  opacity: 0;
  overflow: hidden;
  transition-delay: 0ms;
}

.rail-collapsed .nav-unread-dot {
  position: absolute;
  top: 10px;
  right: 11px;
  width: 9px;
  height: 9px;
}

.rail-collapsed {
  overflow: visible;
}

.rail-collapsed .rail-user {
  position: relative;
  z-index: 6;
  padding: 14px 8px;
  overflow: visible;
}

.rail-collapsed .user-summary {
  justify-content: center;
  padding: 4px;
  gap: 0;
}

.rail-user-menu-floating {
  position: fixed;
  z-index: 12000;
  min-width: 132px;
  padding: 8px;
  border: 1px solid rgba(226, 232, 240, 0.96);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.14);
  transform: translateY(-50%);
  animation: railUserMenuIn 180ms var(--rail-motion-ease) both;
}

.rail-user-menu-floating .user-menu-item {
  width: 100%;
}

:global(.rail-tooltip-popper) {
  max-width: 180px;
  padding: 7px 10px !important;
  border: 1px solid rgba(var(--theme-primary-rgb, 58, 124, 165), 0.22) !important;
  border-radius: 4px !important;
  background: rgba(255, 255, 255, 0.98) !important;
  color: #1f2937 !important;
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.14) !important;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0;
}

:global(.rail-tooltip-popper.el-popper.is-light) {
  border-color: rgba(var(--theme-primary-rgb, 58, 124, 165), 0.22) !important;
}

:global(.rail-tooltip-popper .el-popper__arrow::before) {
  border-color: rgba(var(--theme-primary-rgb, 58, 124, 165), 0.22) !important;
  background: rgba(255, 255, 255, 0.98) !important;
}

@keyframes railUserMenuIn {
  from {
    opacity: 0;
    transform: translateY(-50%) translateX(-6px);
  }

  to {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
  }
}

.rail-collapsed .user-copy,
.rail-collapsed .user-summary .mdi {
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateX(-6px);
  transition-delay: 0ms;
}

@media (max-width: 980px) {
  .rail {
    position: relative;
    height: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rail *,
  .rail *::before,
  .rail *::after {
    transition-duration: 120ms !important;
    animation-duration: 120ms !important;
  }
}