/* sidenav.css —— 左侧抽屉式分组导航:默认收起为左缘竖条,点击滑出展开 */
/* 收起态按钮(左缘竖条) */
.side-tab {
  position: fixed; left: 0; top: 50%; transform: translateY(-50%);
  z-index: 41; width: 26px; padding: 14px 5px;
  writing-mode: vertical-rl; letter-spacing: 3px;
  background: rgba(21,23,41,.92); color: var(--accent);
  border: 1px solid var(--border); border-left: none;
  border-radius: 0 10px 10px 0;
  font-size: 12px; cursor: pointer;
  transition: left .25s, background .15s;
}
.side-tab:hover { background: var(--card-hover); }
body.side-open .side-tab { left: 132px; border-radius: 10px 0 0 10px; border-left: 1px solid var(--border); border-right: none; }

/* "全部展开/收起"竖条:与"分组导航"同款,叠在其下方(抽屉展开时一同让位) */
.side-all-tab { top: calc(50% + 112px); color: var(--text-dim); }
.side-all-tab:hover { color: var(--accent); }

/* 抽屉面板:默认收起(滑出左侧),展开时滑入 */
.side-nav {
  position: fixed; left: 10px; top: 50%; transform: translateY(-50%) translateX(-130%);
  z-index: 40; width: 118px;
  display: flex; flex-direction: column; gap: 4px;
  background: rgba(21,23,41,.92); backdrop-filter: blur(6px);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 8px 6px; opacity: 0; pointer-events: none;
  max-height: calc(100vh - 160px); overflow-y: auto;
  transition: transform .25s ease, opacity .2s ease;
}
body.side-open .side-nav { transform: translateY(-50%) translateX(0); opacity: 1; pointer-events: auto; }
.side-nav::-webkit-scrollbar { width: 4px; }
.side-nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.sn-item {
  display: flex; align-items: center; gap: 6px;
  background: transparent; border: none; border-radius: 8px;
  color: var(--text-dim); font-size: 12px; cursor: pointer;
  padding: 7px 9px; text-align: left; transition: all .13s;
}
.sn-item .sn-name {
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0;
}
.sn-item i { font-style: normal; font-size: 10px; opacity: .75; }
.sn-item:hover { color: var(--text); background: rgba(255,255,255,.05); }
.sn-item.on { color: var(--accent); }
.sn-item.cur { color: var(--accent); background: rgba(230,180,90,.13); font-weight: 600; }

/* 展开时主内容让位;收起时不写 main 规则,保留 base.css 的 margin:0 auto 居中(避免右侧空白) */
body.side-open main { margin-left: 142px; }
@media (max-width: 960px) {
  .side-nav, .side-tab { display: none; }
  body.side-open main { margin-left: 0; }
}