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.acad-tree{opacity:0;pointer-events:none;border-right:0;width:0;min-width:0}.acad[data-tree=collapsed] .acad-tree-toggle{display:flex}}@media (min-width:1180px){#app[data-page=academy]:has(#rightPanel.is-rail) .acad-ctx-toggle{display:flex}}@media (min-width:768px){#app[data-page=academy] .right .support-close{display:none}}@media (min-width:768px) and (max-width:1179px){#app[data-page=academy] .right{width:var(--right-rail)}#app[data-page=academy] .right .right-head,#app[data-page=academy] .right .right-body{display:none}#app[data-page=academy] .right .right-rail{display:flex}}@media (max-width:1179px){.acad-tree{width:296px}.acad-detail-head{z-index:3;padding:0 16px;position:sticky;top:0}.detail{gap:22px;padding:30px 30px 56px}.acad-stage{display:block;overflow-y:auto}.acad-detail{display:block}.acad-detail-scroll{overflow:visible}.acad-ctx-m{border-top:1px solid var(--border-subtle);max-width:700px;padding:22px 30px 8px;display:block}}@media (max-width:767px){.acad-mswitch{background:var(--canvas);border-bottom:1px solid var(--border-subtle);z-index:5;gap:3px;padding:8px 12px;display:flex;position:sticky;top:0}.acad-mswitch button{border:1px solid var(--border-subtle);background:var(--surface);height:34px;color:var(--muted);cursor:pointer;border-radius:9px;flex:1;justify-content:center;align-items:center;gap:7px;font-size:12.5px;font-weight:560;display:inline-flex}.acad-mswitch button svg{width:15px;height:15px}.acad-mswitch button.active{background:var(--ink);color:var(--inverse);border-color:var(--ink)}.acad{min-height:0;display:block;position:relative}.acad-tree{border-right:0;width:100%;height:100%}.acad-tree-collapse{display:none}.acad-ctx-m{max-width:none;padding:20px 18px 8px}.acad-stage{height:100%}.acad[data-mview=curriculum] .acad-stage{display:none}.acad[data-mview=curriculum] .acad-tree{display:flex}.acad[data-mview=lesson] .acad-tree{display:none}.acad[data-mview=lesson] .acad-stage{display:block}.acad-tree-scroll,.acad-stage{padding-bottom:calc(96px + env(safe-area-inset-bottom))}.acad-detail-head{display:none}.detail{gap:22px;padding:22px 18px 30px}.detail h1{font-size:25px}.d-lead{font-size:15px}.d-grid2{grid-template-columns:1fr}.acad-ctx-head{display:none}.acad-ctx-scroll{padding:18px 18px 22px}.stepbar{gap:8px}.step .st-meta b{font-size:12px}.acad[data-mview=lesson] .acad-mcont{z-index:28;padding:10px 14px calc(10px + env(safe-area-inset-bottom));background:var(--topbar-bg);-webkit-backdrop-filter:blur(14px)saturate(1.4);border-top:1px solid var(--border-subtle);align-items:center;gap:10px;display:flex;position:fixed;bottom:0;left:0;right:0}.acad[data-mview=lesson] .acad-stage{padding-bottom:calc(150px + env(safe-area-inset-bottom))}.acad-mcont .mc-meta{flex:1;min-width:0}.acad-mcont .mc-meta .k{letter-spacing:.07em;text-transform:uppercase;color:var(--muted);font-size:9.5px;font-weight:700;display:block}.acad-mcont .mc-meta b{color:var(--ink);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:580;display:block;overflow:hidden}.acad-mcont{bottom:calc(58px + env(safe-area-inset-bottom))}}.d-mcrumb{display:none}@media (max-width:767px){.d-mcrumb{display:flex}}