.shell {
  height: 100vh;
  width: 100vw;
}

.app {
  flex: 1;
  min-height: 0;
  min-width: 0;
  display: flex;
}

.sidebar {
  width: var(--cu-rail-width);
  height: 100%;
  background-color: var(--cu-rail-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 12px;
  padding-bottom: 12px;
  flex-shrink: 0;
}

.sidebar__logo {
  margin-bottom: 12px;
  display: flex;
  justify-content: center;
  width: 100%;
}

.sidebar__logo-avatar {
  width: 30px;
  height: 30px;
  border-radius: var(--cu-radius-btn);
  background: linear-gradient(135deg, var(--cu-primary-purple), #9f7aea);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 12px;
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  gap: 2px;
  flex: 1;
  overflow-y: auto;
}

.sidebar__item {
  width: 48px;
  min-height: 40px;
  border-radius: var(--cu-radius-btn);
  border: none;
  background: transparent;
  color: var(--cu-rail-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  cursor: pointer;
  padding: 4px 0;
}

.sidebar__item-icon {
  width: 28px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
}

.sidebar__item:hover .sidebar__item-icon {
  background-color: var(--cu-rail-hover-bg);
  color: #FFFFFF;
}

.sidebar__label {
  display: none;
  font-size: 9px;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
}

.sidebar__item--active {
  color: #FFFFFF;
}

.sidebar__item--active .sidebar__item-icon {
  background-color: var(--cu-rail-active-bg);
  color: var(--cu-rail-text-active);
}

.sidebar__item--active .sidebar__label {
  display: block;
}

.sidebar__bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  gap: 10px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar__user-avatar {
  width: 26px;
  height: 26px;
  border-radius: var(--cu-radius-round);
  background-color: #3b82f6;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}

/* Main content area */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
}