/* ===== PUXIN 教师后台外壳（浅色专业仪表盘） ===== */
:root{--sh-bg:#f5f7fb;--sh-card:#fff;--sh-line:#e6e9f0;--sh-ink:#1f2430;--sh-dim:#7c8494;--sh-acc:#3b5bdb;--sh-acc-soft:#eef1fd;}
body{background:var(--sh-bg)!important;}
/* 顶栏上下文条 */
.topbar .ctx{display:flex;align-items:center;gap:8px;margin-left:16px;}
.topbar .ctx select{border:1px solid var(--sh-line);background:#fff;border-radius:8px;padding:6px 10px;font:inherit;font-size:12.5px;color:var(--sh-ink);cursor:pointer;}
.teacher-tabbar{display:none!important;}
/* 三区栅格 */
.shell{display:grid;grid-template-columns:230px 1fr;align-items:start;}
.shell .side{position:sticky;top:0;align-self:start;height:100vh;overflow-y:auto;background:var(--sh-card);border-right:1px solid var(--sh-line);padding:12px 0;}
.side-cap{font-size:10.5px;color:var(--sh-dim);font-weight:700;letter-spacing:1px;padding:6px 18px 4px;}
.side .grp{width:100%;display:flex;align-items:center;gap:10px;background:none;border:0;padding:11px 16px;font:inherit;font-size:13.5px;font-weight:700;color:var(--sh-ink);cursor:pointer;text-align:left;}
.side .grp .ico{width:20px;text-align:center;}
.side .grp .arw{margin-left:auto;transition:.2s;color:var(--sh-dim);font-size:11px;}
.side .grp:hover{background:#f7f8fc;}
.side .grp.open{color:var(--sh-acc);}
.side .grp.open .arw{transform:rotate(90deg);}
.side .sub{max-height:0;overflow:hidden;transition:max-height .25s ease;}
.side .sub.open{max-height:360px;}
.side .subitem{display:block;padding:9px 16px 9px 46px;font-size:12.8px;color:var(--sh-dim);text-decoration:none;cursor:pointer;border-left:3px solid transparent;}
.side .subitem:hover{background:#f7f8fc;color:var(--sh-ink);}
.side .subitem.active{color:var(--sh-acc);background:var(--sh-acc-soft);border-left-color:var(--sh-acc);font-weight:700;}
.side-foot{margin-top:8px;border-top:1px solid var(--sh-line);padding:12px 16px;font-size:12px;color:var(--sh-dim);cursor:pointer;}
/* 主区 */
.shell > main{min-width:0;padding:8px 6px 40px;}
.shell > main > .hero{display:none;}
.shell .crumb{font-size:12.5px;color:var(--sh-dim);padding:12px 16px 2px;}
.shell .crumb b{color:var(--sh-ink);}
.shell > main .wrap{max-width:100%!important;}
.shell > main > section.block{margin:0 0 14px;}
@media(max-width:900px){.shell{grid-template-columns:1fr;}.shell .side{position:fixed;left:0;top:0;bottom:0;width:230px;transform:translateX(-100%);transition:.2s;z-index:30;box-shadow:2px 0 12px rgba(0,0,0,.12);}.shell .side.show{transform:none;}.sh-menu-btn{display:inline-flex!important;}}
.sh-menu-btn{display:none;align-items:center;border:1px solid var(--sh-line);background:#fff;border-radius:8px;padding:6px 12px;font-size:16px;cursor:pointer;margin-right:8px;}