/* 骨架: 左侧栏 + 顶栏 + 内容区 */
.app { display: flex; min-height: 100vh; }

.side { width: 200px; flex: none; background: #151a24; color: #c9cfdb; display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.side__brand { padding: 18px 20px; font-weight: 700; color: #fff; letter-spacing: .3px; }
.nav { display: flex; flex-direction: column; padding: 4px 8px; gap: 2px; }
.nav__item { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; border-radius: 6px; color: inherit; }
.nav__item:hover { background: rgba(255, 255, 255, .06); text-decoration: none; }
.nav__item--active { background: var(--primary); color: #fff; }
.nav__badge { background: var(--danger); color: #fff; border-radius: 10px; padding: 0 7px; font-size: 12px; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.top { height: 54px; flex: none; display: flex; align-items: center; justify-content: space-between; padding: 0 24px; background: var(--surface); border-bottom: 1px solid var(--line); }
.top__crumb { font-weight: 600; font-size: 15px; }
.top__user { display: flex; align-items: center; gap: 12px; }
.content { padding: 20px 24px; flex: 1; min-height: 0; }

.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 14px; }
.toolbar__spacer { flex: 1; }
.grid { display: grid; gap: 16px; }
.grid--stats { grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); }
.grid--2 { grid-template-columns: 1fr 1fr; }
.split { display: grid; grid-template-columns: 280px 1fr; gap: 16px; align-items: start; }

/* 窄屏: 侧栏变成顶部横向可滚动的菜单条(没有图标, 不能只缩成一列窄条) */
@media (max-width: 900px) {
  .app { flex-direction: column; }
  .side { width: auto; height: auto; position: sticky; z-index: 10; }
  .side__brand { display: none; }
  .nav { flex-direction: row; overflow-x: auto; padding: 6px 8px; }
  .nav__item { white-space: nowrap; gap: 6px; }
  .content { padding: 14px; }
  .grid--2, .split { grid-template-columns: 1fr; }
}