/* 左侧功能区：顶部 Logo / 中部导航 / 底部入口 */
.sidebar {
  position: relative;
  z-index: 50;
  display: flex;
  flex-direction: column;
  width: var(--sidebar-w);
  flex-shrink: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: width 0.38s var(--ease-spring);
}

/* 顶部区：Logo + 站名 + 折叠按钮 */
.sidebar-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 16px 14px;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 14px;
  background: var(--grad-brand);
  background-size: 200% 100%;
  color: var(--accent-contrast);
  box-shadow: 0 10px 20px -8px var(--accent-glow);
  cursor: pointer;
  transition: transform var(--dur-mid) var(--ease-spring), box-shadow var(--dur-mid) var(--ease-smooth);
  animation: grad-shift 9s linear infinite;
}

.sidebar-logo:hover {
  transform: scale(1.08) rotate(-3deg);
  box-shadow: 0 14px 26px -8px var(--accent-glow);
}

.sidebar-logo:active {
  transform: scale(0.96) rotate(0deg);
}

.sidebar-logo svg {
  width: 24px;
  height: 24px;
}

.sidebar-title {
  flex: 1;
  min-width: 0;
}

.sidebar-title .site-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 2px;
  background: var(--grad-brand);
  background-size: 200% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  animation: grad-shift 9s linear infinite;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-title .site-sub {
  font-size: 11px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-3);
}

.sidebar-collapse {
  width: 30px;
  height: 30px;
  border-radius: 10px;
}

.sidebar-collapse svg {
  width: 16px;
  height: 16px;
  transition: transform 0.38s var(--ease-spring);
}

/* 中部导航区 */
.sidebar-nav {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: 6px 12px 8px;
}

.nav-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

/* 底部区：主题切换 + 管理入口 */
.sidebar-foot {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-top: 1px solid var(--divider);
}

.admin-entry {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  background: var(--glass-bg);
  border: var(--glass-border);
  box-shadow: var(--shadow-neu-sm);
  transition: all var(--dur-fast) var(--ease-smooth);
}

.admin-entry:hover {
  color: var(--accent);
  transform: translateY(-1px);
}

.admin-entry svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

/* ===== 折叠态（图标模式） ===== */
.sidebar.collapsed {
  width: var(--sidebar-w-collapsed);
}

.sidebar.collapsed .sidebar-head {
  flex-direction: column;
  gap: 10px;
  padding: 18px 0 12px;
}

.sidebar.collapsed .sidebar-title,
.sidebar.collapsed .admin-entry .entry-text,
.sidebar.collapsed .nav-item-label,
.sidebar.collapsed .nav-item-lock-badge,
.sidebar.collapsed .nav-count,
.sidebar.collapsed .nav-pager-label {
  display: none;
}

.sidebar.collapsed .sidebar-collapse svg {
  transform: rotate(180deg);
}

.sidebar.collapsed .admin-entry {
  justify-content: center;
  padding: 10px 0;
}

.sidebar.collapsed .nav-item {
  justify-content: center;
  padding-left: 0;
  padding-right: 0;
}

.sidebar.collapsed .nav-item-chevron {
  display: none;
}

/* 折叠态悬浮提示名称 */
.sidebar.collapsed .nav-item:hover::after {
  content: attr(data-name);
  position: absolute;
  left: calc(100% + 14px);
  top: 50%;
  transform: translateY(-50%);
  padding: 5px 12px;
  font-size: 12px;
  white-space: nowrap;
  border-radius: 8px;
  color: var(--text-1);
  background: var(--glass-bg-strong);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: var(--glass-border);
  box-shadow: var(--shadow-neu-sm);
  z-index: 60;
  pointer-events: none;
  animation: fade-in 0.18s var(--ease-smooth);
}