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input{width:100%;color:var(--ink);background:0 0;border:0;outline:0;font-size:13px}.hierarchy-empty{text-align:center;color:var(--muted);flex-direction:column;align-items:center;gap:6px;padding:48px 20px;display:flex}.hierarchy-empty strong{color:var(--ink);font-size:16px}.hierarchy-empty p{max-width:440px;margin:0;font-size:13px}.upload-modal-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background:#0f172a73;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.upload-modal-card{box-sizing:border-box;background:#fff;border-radius:16px;width:100%;max-width:620px;max-height:90vh;padding:28px;overflow-y:auto;box-shadow:0 20px 48px #00000029}.upload-modal-head{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:20px;padding-bottom:14px;display:flex}.upload-modal-head h2{color:var(--ink);margin:0 0 4px;font-size:22px;font-weight:750}.upload-modal-head p{color:var(--muted);margin:0;font-size:13px}.upload-modal-close{border:1px solid var(--line);color:#64746b;cursor:pointer;background:#fff;border-radius:50%;flex-shrink:0;place-items:center;width:32px;height:32px;transition:all .15s;display:grid}.upload-modal-close:hover{color:#1a2e22;background:#f1f5f2}.upload-modal-actions{border-top:1px solid var(--line);justify-content:flex-end;align-items:center;gap:10px;margin-top:20px;padding-top:16px;display:flex}.cancel-btn{border:1px solid var(--line);color:#4b5e52;cursor:pointer;background:#fff;border-radius:8px;padding:9px 16px;font-size:13px;font-weight:650;transition:all .15s}.cancel-btn:hover{background:#f1f5f2}@media (max-width:768px){.class-grid-admin,.subject-grid-admin{grid-template-columns:1fr;gap:12px}.content-topbar{flex-direction:row;justify-content:space-between;align-items:center;gap:10px;height:auto;min-height:52px;padding:8px 0}.content-breadcrumbs{white-space:nowrap;flex:1;min-width:0;overflow-x:auto}.topbar-right-actions{flex-shrink:0}.topbar-signout-btn{white-space:nowrap;padding:6px 10px;font-size:12px}.content-intro-bar{flex-direction:column;align-items:stretch;gap:14px;padding:16px 0 14px}.content-intro-actions{flex-direction:column;align-items:stretch;gap:10px;width:100%}.view-mode-switch{grid-template-columns:1fr 1fr;width:100%;display:grid}.view-mode-btn{justify-content:center;padding:8px 10px}.upload-trigger-btn{justify-content:center;width:100%}.chapter-row-admin{flex-direction:column;align-items:stretch;gap:12px}.chapter-action-group{border-top:1px solid var(--line);justify-content:space-between;width:100%;padding-top:10px}.chapter-action-group .review-chapter-btn{flex:1}}