.zuoekai-sidebar-dock {
  position: fixed;
  left: 16px;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  z-index: var(--zuoekai-z-modal);
  pointer-events: none;
}

.zuoekai-sidebar-dock__rail {
  width: 68px;
  max-height: calc(100vh - 48px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 12px 6px;

  border-radius: var(--zuoekai-radius-xl);
  border: 1px solid var(--zuoekai-color-border);
  background: var(--zuoekai-color-surface-float);
  box-shadow: var(--zuoekai-shadow-md);
  backdrop-filter: blur(10px);

  pointer-events: auto;
}

.zuoekai-sidebar-dock__title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.4px;
  color: var(--zuoekai-color-text-secondary);
  padding: 4px 0 2px;
  user-select: none;
}

.zuoekai-sidebar-dock__divider {
  width: 70%;
  height: 1px;
  background: var(--zuoekai-color-border);
  opacity: 0.9;
}

.zuoekai-sidebar-dock__item {
  width: 48px;
  height: 48px;
  border: 0;
  padding: 0;
  border-radius: 14px;
  background: transparent;
  color: var(--zuoekai-color-text-secondary);
  cursor: pointer;
  position: relative;

  display: flex;
  align-items: center;
  justify-content: center;

  transform-origin: center;
  will-change: transform;
  transition:
    transform var(--zuoekai-motion-duration-normal) var(--zuoekai-motion-ease-out),
    background var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    color var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    box-shadow var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out);
  flex-shrink: 0;
}

.zuoekai-sidebar-dock__item svg {
  width: 22px;
  height: 22px;
  stroke: url(#zuoekai-gradient-primary);
}

.zuoekai-dock-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  border-radius: 8px;
  background-color: var(--zuoekai-color-error-600);
  color: white;
  font-size: 10px;
  font-weight: 700;
  line-height: 16px;
  text-align: center;
  box-shadow: 0 0 0 2px var(--zuoekai-color-surface-float);
  z-index: 10;
  pointer-events: none;
  animation: zuoekai-badge-pop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.zuoekai-dock-badge--dot {
  width: 8px;
  height: 8px;
  min-width: 0;
  padding: 0;
  top: 10px;
  right: 10px;
}

@keyframes zuoekai-badge-pop {
  from { transform: scale(0); }
  to { transform: scale(1); }
}

.zuoekai-sidebar-dock__item:hover {
  background: var(--zuoekai-color-action-hover-bg);
  color: var(--zuoekai-color-text);
}

.zuoekai-sidebar-dock__item--active {
  color: var(--zuoekai-color-text-inverse);
  background: linear-gradient(135deg, var(--zuoekai-color-theme-gradient-start), var(--zuoekai-color-theme-gradient-end));
  box-shadow: var(--zuoekai-shadow-brand-glow);
  border-color: transparent;
}

.zuoekai-sidebar-dock__item--active svg {
  stroke: var(--zuoekai-color-text-inverse);
}

.zuoekai-sidebar-dock__label {
  position: fixed;
  left: 0;
  top: 0;
  transform: translateY(-50%);

  padding: 8px 12px;
  border-radius: var(--zuoekai-radius-sm);
  border: 1px solid var(--zuoekai-color-border);
  background: var(--zuoekai-color-surface-float);
  box-shadow: var(--zuoekai-shadow-md);
  backdrop-filter: blur(10px);

  font-size: 13px;
  line-height: 1.2;
  font-weight: 600;
  color: var(--zuoekai-color-text);

  opacity: 0;
  visibility: hidden;
  pointer-events: none;

  transition:
    opacity var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    visibility var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out),
    transform var(--zuoekai-motion-duration-fast) var(--zuoekai-motion-ease-out);
}

.zuoekai-sidebar-dock__label--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(8px);
}

.zuoekai-sidebar-dock__toggle {
  display: none;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] {
  top: auto;
  left: 16px;
  bottom: 100px;
  width: 52px;
  height: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
  z-index: 2000;
  padding-bottom: 0;
  padding-left: 0;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--zuoekai-color-surface-float);
  border: 1px solid var(--zuoekai-color-border);
  box-shadow: var(--zuoekai-shadow-lg);
  color: var(--zuoekai-color-text);
  cursor: pointer;
  pointer-events: auto;
  backdrop-filter: blur(10px);
  z-index: 2;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__toggle svg {
  width: 24px;
  height: 24px;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"].zuoekai-sidebar-dock--expanded .zuoekai-sidebar-dock__toggle {
  transform: rotate(180deg);
  background: var(--zuoekai-color-surface-panel);
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__rail {
  display: flex;
  flex-direction: column;
  width: 52px;
  max-height: 0;
  padding: 0;
  gap: 8px;
  margin-bottom: 12px;
  border: none;
  background: transparent;
  box-shadow: none;
  border-radius: 0;
  backdrop-filter: none;
  overflow-y: hidden;
  opacity: 0;
  transform: translateY(20px) scale(0.9);
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    max-height 0.3s ease;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"].zuoekai-sidebar-dock--expanded .zuoekai-sidebar-dock__rail {
  max-height: 60vh;
  pointer-events: auto;
  opacity: 1;
  transform: translateY(0) scale(1);
  overflow-y: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__rail::-webkit-scrollbar {
  display: none;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__item {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--zuoekai-color-surface-float);
  box-shadow: var(--zuoekai-shadow-sm);
  border: 1px solid var(--zuoekai-color-border);
  margin: 0 auto;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__item--active {
  background: linear-gradient(135deg, var(--zuoekai-color-theme-gradient-start), var(--zuoekai-color-theme-gradient-end));
  border-color: transparent;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__title,
.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__divider {
  display: none;
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__label {
  transform: translateY(-50%);
}

.zuoekai-sidebar-dock[data-dock-mode="compact"] .zuoekai-sidebar-dock__label--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(8px);
}