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auto;font-size:16px}.teacher-quiz-input{width:100%;box-sizing:border-box;padding:8px 10px;font-size:15px;border:1px solid rgba(0,0,0,.15);border-radius:8px;outline:none}.teacher-quiz-input:focus{border-color:var(--accent)}.teacher-quiz-ans,.teacher-quiz-brief{font-size:13px;color:var(--muted)}.teacher-explain-btn{align-self:flex-start;font-size:13px;padding:4px 12px;border:1px solid rgba(0,0,0,.15);background:#fff;border-radius:6px;cursor:pointer}.teacher-explain-btn:hover{border-color:var(--accent)}.teacher-explain-panel{border-top:1px solid rgba(0,0,0,.1);padding-top:12px;margin-top:4px}.teacher-explain-head{display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:600;margin-bottom:8px}.teacher-explain-head button{font-size:13px;padding:2px 10px;border:1px solid rgba(0,0,0,.15);background:#fff;border-radius:6px;cursor:pointer}.teacher-explain-body{font-size:15px;line-height:1.75}.teacher-explain-body .markdown :first-child{margin-top:0}.album-toolbar{display:flex;align-items:center;gap:12px;margin-bottom:12px}.album-upload{padding:8px 16px;border:none;background:var(--accent);color:#fff;border-radius:8px;cursor:pointer;font-size:14px}.album-upload:disabled{opacity:.6;cursor:default}.album-hint{font-size:13px;color:var(--muted)}.album-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:8px}.album-cell{padding:0;border:1px solid rgba(0,0,0,.1);border-radius:10px;overflow:hidden;cursor:pointer;background:#fff;aspect-ratio:1}.album-cell:hover{border-color:var(--accent)}.album-cell img{width:100%;height:100%;object-fit:cover;display:block}@media (max-width: 600px){.members{display:none}}