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(max-width:900px){.shell{grid-template-columns:1fr}.sidebar{position:static}.grid,.stat-grid{grid-template-columns:1fr}.admin-user-row{flex-direction:column;align-items:flex-start}.billing-grid,.studio-grid{grid-template-columns:1fr}.settings-rail{position:static}.topbar,.composer-header,.composer-footer,.section-title{flex-direction:column;align-items:flex-start}}@media (max-width:620px){.engine-tabs,.mode-tabs{grid-template-columns:1fr}}.voice-upload h2{align-items:center;gap:8px;display:flex}.upload-hint{color:var(--muted);margin:0 0 14px;font-size:14px}.dropzone{border:2px dashed var(--line);text-align:center;cursor:pointer;border-radius:10px;margin-bottom:14px;padding:28px;transition:border-color .2s,background-color 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