.treemap-container rect{transition:opacity .25s,filter .25s;will-change:opacity,transform}.treemap-container .treemap-node rect:hover{filter:brightness(1.2);stroke:#ffffff80!important}.treemap-root-bar rect:hover{filter:brightness(1.15)}.treemap-back-btn:hover rect{fill:#ffffff61!important}.treemap-back-btn:active rect{fill:#ffffff80!important}.treemap-cs-btn:hover rect{fill:#ffffff61!important}.treemap-cs-btn:active rect{fill:#ffffff80!important}.treemap-label{transition:opacity .2s ease-out;will-change:opacity}@media(max-width:767px){body:not(.sunburst-mode) .center-label{display:none!important}body:not(.sunburst-mode) .breadcrumb{display:none!important}.grade-selector{order:2;margin-left:auto;flex:0 0 auto}.daily-quiz-btn{order:3}.grade-dropdown{font-family:Inter,sans-serif;font-size:13px;font-weight:500;color:var(--text-primary, #e8e8ed);background:#191b23d9;border:1px solid var(--border, #2a2d3a);border-radius:20px;padding:6px 32px 6px 14px;line-height:1.2;cursor:pointer;transition:all .2s;outline:none;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%239a9aad' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center}.grade-dropdown:hover{background-color:var(--surface-hover, rgba(255,255,255,.06));border-color:#ffffff26}.grade-dropdown:focus{border-color:var(--accent-border, #60a5fa);box-shadow:0 0 0 2px #60a5fa26}.grade-dropdown option{background:var(--bg, #0f1117);color:var(--text-primary, #e8e8ed);font-size:14px;padding:8px 12px}.grade-selector .grade-label{display:none}}