:root {
  --primary: #4834d4;
  --primary-dark: #372bb2;
  --primary-light: #6c5ce7;
  --accent: #00cec9;
  --dark: #2d3436;
  --light: #ffffff;
  --gray: #636e72;
  --light-gray: #dfe6e9;
  --hover-bg: rgba(72, 52, 212, 0.08);
  --active-bg: rgba(72, 52, 212, 0.15);
  --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --transition: all 0.2s ease;

  --topbar-height: 56px;
  --sidebar-width: 260px;
}

/* 顶栏 */
.app-topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  background: var(--light);
  border-bottom: 1px solid var(--light-gray);
}

.sidebar-toggle {
  width: 40px;
  height: 40px;
  border: 1px solid var(--light-gray);
  background: transparent;
  border-radius: 10px;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.sidebar-toggle:hover {
  background: var(--hover-bg);
}

.topbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.2px;
}

.topbar-brand img {
  width: 24px;
  height: 24px;
}

.topbar-actions {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.topbar-action {
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--light-gray);
  color: var(--primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 12px;
  transition: var(--transition);
}

.topbar-action:hover {
  background: var(--hover-bg);
}

.topbar-action-text {
  font-size: 13px;
  font-weight: 700;
  color: inherit;
}

/* 登出：更明确的危险色提示 */
.topbar-action.topbar-logout {
  border-color: rgba(214, 48, 49, 0.35);
  color: #d63031;
}

.topbar-action.topbar-logout:hover {
  background: rgba(214, 48, 49, 0.10);
}

/* 侧边栏 */
.app-sidebar {
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--light);
  border-right: 1px solid var(--light-gray);
  z-index: 150;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  transform: translateX(0);
  transition: transform 0.25s ease;
}

/* 桌面端折叠：隐藏侧栏并收回内容区边距 */
body.has-sidebar.sidebar-collapsed .app-sidebar {
  transform: translateX(calc(-1 * var(--sidebar-width)));
}

body.has-sidebar.sidebar-collapsed .app-main {
  margin-left: 0;
}

.sidebar-scroll {
  height: 100%;
  overflow-y: auto;
  padding: 12px;
}

.sidebar-group {
  margin-bottom: 14px;
}

.sidebar-group-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 10px 8px;
}

.sidebar-icon {
  width: 18px;
  text-align: center;
  margin-right: 10px;
  font-size: 14px;
  opacity: 0.9;
}

.sidebar-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-link,
.sidebar-sublink,
.sidebar-section-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0;
  padding: 10px 10px;
  border-radius: 10px;
  color: var(--dark);
  text-decoration: none;
  transition: var(--transition);
  border: 1px solid transparent;
}

.sidebar-link:hover,
.sidebar-sublink:hover,
.sidebar-section-toggle:hover {
  background: var(--hover-bg);
  color: var(--primary);
}

.sidebar-link.active,
.sidebar-sublink.active {
  background: var(--active-bg);
  border-color: rgba(72, 52, 212, 0.18);
  color: var(--primary);
  font-weight: 700;
}

.sidebar-section {
  margin: 2px 0;
}

.sidebar-section-toggle {
  background: transparent;
  cursor: pointer;
  justify-content: space-between;
}

.sidebar-section-label {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.sidebar-chevron {
  margin-left: 10px;
  color: var(--gray);
  transition: transform 0.2s ease;
}

.sidebar-section-body {
  display: none;
  padding-left: 10px;
  margin: 4px 0 8px;
  border-left: 1px dashed rgba(99, 110, 114, 0.25);
}

.sidebar-section.open .sidebar-section-body {
  display: block;
}

.sidebar-section.open .sidebar-chevron {
  transform: rotate(180deg);
}

.sidebar-sublink {
  padding: 8px 10px;
  font-size: 13px;
  color: var(--gray);
}

.sidebar-footer {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--light-gray);
}

.sidebar-logout {
  color: var(--primary);
  border: 1px solid rgba(72, 52, 212, 0.25);
}

.sidebar-logout:hover {
  background: var(--primary);
  color: var(--light);
  border-color: var(--primary);
}

/* 主内容区：仅在存在侧边栏时留出空间 */
body.has-sidebar .app-main {
  margin-left: var(--sidebar-width);
}

/* 小屏：侧边栏改为抽屉 */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: var(--topbar-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.35);
  z-index: 140;
}

@media (max-width: 991px) {
  body.has-sidebar .app-main {
    margin-left: 0;
  }

  .app-sidebar {
    transform: translateX(-110%);
  }

  body.sidebar-open .app-sidebar {
    transform: translateX(0);
  }

  body.sidebar-open .sidebar-overlay {
    display: block;
  }

  /* 小屏顶栏按钮更紧凑：隐藏文字 */
  .topbar-action-text {
    display: none;
  }
}

/* 兼容：防止侧边栏遮挡浮动消息 */
@media (min-width: 992px) {
  body.has-sidebar .notification {
    left: calc(var(--sidebar-width) + 10px) !important;
    right: 10px;
  }

  body.has-sidebar.sidebar-collapsed .notification {
    left: 10px !important;
    right: 10px;
  }
}