/**
 * 布局：顶栏、侧栏、主内容区
 */
* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
}

.app {
  display: flex;
  height: 100%;
  min-width: 0;
}

/* ---------- 左侧菜单 ---------- */
.sidebar {
  width: var(--sidebar-w);
  background: var(--card);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 10;
  transition: width 0.2s ease;
  overflow: hidden;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-w);
}

.sidebar .logo-wrap {
  height: var(--header-h);
  padding: 0 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar .logo {
  font-weight: 700;
  font-size: 16px;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}

.sidebar .logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  flex-shrink: 0;
}

.sidebar .logo-text {
  white-space: nowrap;
  overflow: hidden;
  transition: opacity 0.2s ease;
}

.sidebar.collapsed .logo-text {
  opacity: 0;
  width: 0;
  overflow: hidden;
  padding: 0;
}

.sidebar.collapsed .logo {
  flex: 0;
}

.sidebar-toggle {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: background 0.2s, color 0.2s;
  flex-shrink: 0;
}

.sidebar-toggle:hover {
  background: #F5F6FA;
  color: var(--primary);
}

.sidebar.collapsed .sidebar-toggle .icon-expand {
  display: inline;
}
.sidebar.collapsed .sidebar-toggle .icon-collapse {
  display: none;
}
.sidebar-toggle .icon-expand {
  display: none;
}
.sidebar .sidebar-toggle .icon-collapse {
  display: inline;
}

.nav-list {
  padding: 16px 0;
  overflow-y: auto;
  overflow-x: hidden;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--text-muted);
  text-decoration: none;
  transition: background .2s, color .2s;
  border-left: 3px solid transparent;
  font-size: 14px;
}

.nav-item:hover { background: #F5F6FA; color: var(--text); }
.nav-item.active { background: var(--primary-light); color: var(--primary); font-weight: 600; border-left-color: var(--primary); }
.nav-item .icon {
  font-size: 18px;
  width: 22px;
  min-width: 22px;
  text-align: center;
  flex-shrink: 0;
}
.nav-item .nav-text {
  white-space: nowrap;
  overflow: hidden;
  transition: opacity 0.2s ease;
}

.sidebar.collapsed .nav-item {
  padding: 10px 0;
  justify-content: center;
}
.sidebar.collapsed .nav-item .nav-text {
  opacity: 0;
  width: 0;
  overflow: hidden;
  padding: 0;
}

/* 分组：带图标的一级标题 + 右侧折叠按钮 */
.nav-group {
  margin-bottom: 4px;
}

.nav-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--text-muted);
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: background .2s, color .2s;
  user-select: none;
  cursor: pointer;
}

.nav-group-header:hover {
  background: #F5F6FA;
  color: var(--primary);
}

.nav-group-header .icon {
  font-size: 18px;
  width: 22px;
  min-width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.nav-group-header .nav-text {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  transition: opacity 0.2s ease;
}

.nav-group-toggle {
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
  transition: transform 0.2s ease, background 0.2s, color 0.2s;
}

.nav-group-toggle:hover {
  background: #F5F6FA;
  color: var(--primary);
}

.nav-group-toggle .arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}

.nav-group.collapsed .nav-group-toggle .arrow {
  transform: rotate(-90deg);
}

.nav-sub {
  list-style: none;
  padding-left: 0;
  overflow: hidden;
  max-height: 400px;
  transition: max-height 0.25s ease;
}

.nav-group.collapsed .nav-sub {
  max-height: 0;
  margin: 0;
  padding: 0;
}

.nav-sub .nav-item {
  padding-left: 48px;
  font-size: 13px;
}
.sidebar.collapsed .nav-sub .nav-item {
  padding-left: 0;
  justify-content: center;
}

.sidebar.collapsed .nav-group-header {
  padding: 10px 0;
  justify-content: center;
}
.sidebar.collapsed .nav-group-header .nav-text {
  opacity: 0;
  width: 0;
  overflow: hidden;
  padding: 0;
}
.sidebar.collapsed .nav-group-toggle {
  display: none;
}

/* ---------- 主内容区 ---------- */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.header {
  height: var(--header-h);
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-shrink: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-user {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .2s;
}
.header-user:hover { background: #F5F6FA; }

.header-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  overflow: hidden;
  flex-shrink: 0;
}
.header-avatar img { width: 100%; height: 100%; object-fit: cover; display: block; }

.header-nickname {
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.content {
  flex: 1;
  overflow: auto;
  padding: 24px;
}

.page {
  display: none;
  height: 100%;
}
.page.active { display: block; }

.content-inner {
  max-width: 1400px;
  margin: 0 auto;
}

/* 面包屑：在每页内容上方 */
.breadcrumb {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding: 0;
  background: none;
}
.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 8px; color: var(--border); }
.breadcrumb .current { color: var(--text); font-weight: 500; }