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var(--border-light);margin-bottom:12px;padding:20px}.question-item__q{margin-bottom:12px}.question-item__label{color:var(--accent);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;font-size:12px;font-weight:600}.question-item__text{color:var(--text-primary);white-space:pre-wrap;font-size:15px;line-height:1.6}.question-item__a{border-top:1px solid var(--border-light);padding-top:12px}.question-item__answer{color:var(--text-body);font-size:14px;line-height:1.6}.question-item__time{color:var(--text-tertiary);margin-top:8px;font-size:12px}.question-empty{text-align:center;color:var(--text-tertiary);padding:60px 20px;font-size:15px}.knowledge-header{justify-content:space-between;align-items:center;margin-bottom:20px;display:flex}.knowledge-header__actions{align-items:center;gap:8px;display:flex}.knowledge-add-btn{background:var(--accent);color:var(--text-inverse);border-radius:var(--radius-md);cursor:pointer;border:none;align-items:center;gap:6px;padding:10px 20px;font-size:14px;font-weight:600;transition:background .15s;display:flex}.knowledge-add-btn:hover{background:var(--accent-hover)}.knowledge-form{background:var(--bg-card);border-radius:var(--radius-sm);border:1px solid var(--border-light);margin-bottom:20px;padding:24px}.knowledge-form__group{margin-bottom:16px}.knowledge-form__label{color:var(--text-primary);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.knowledge-form__input,.knowledge-form__select,.knowledge-form__textarea{border:1px solid var(--border);border-radius:var(--radius-sm);box-sizing:border-box;background:var(--bg-card);width:100%;color:var(--text-primary);padding:10px 14px;font-family:inherit;font-size:14px;transition:border-color .2s,box-shadow .2s}.knowledge-form__input:focus,.knowledge-form__select:focus,.knowledge-form__textarea:focus{border-color:var(--accent);box-shadow:var(--focus-ring)}.knowledge-form__textarea{resize:vertical;min-height:120px}.knowledge-form__actions{justify-content:flex-end;gap:10px;display:flex}.knowledge-form__submit{background:var(--accent);color:var(--text-inverse);border-radius:var(--radius-sm);cursor:pointer;border:none;padding:10px 24px;font-size:14px;font-weight:600;transition:background .15s}.knowledge-form__submit:hover{background:var(--accent-hover)}.knowledge-form__cancel{background:var(--bg);color:var(--text-primary);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;padding:10px 24px;font-size:14px;transition:background .15s}.knowledge-form__cancel:hover{background:var(--border-light)}.knowledge-list{flex-direction:column;gap:8px;display:flex}.knowledge-entry{background:var(--bg-card);border-radius:var(--radius-sm);border:1px solid var(--border-light);padding:16px 20px;transition:border-color .15s}.knowledge-entry:hover{border-color:var(--border)}.knowledge-entry__header{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.knowledge-entry__title{color:var(--text-primary);margin-bottom:4px;font-size:15px;font-weight:600}.knowledge-entry__course{color:var(--accent);background:var(--accent-soft);border-radius:var(--radius-sm);margin-bottom:8px;padding:2px 8px;font-size:12px;display:inline-block}.knowledge-entry__content{color:var(--text-body);max-height:80px;font-size:14px;line-height:1.6;transition:max-height .2s;overflow:hidden}.knowledge-entry__content--expanded{max-height:none}.knowledge-entry__expand{color:var(--accent);cursor:pointer;background:0 0;border:none;margin-top:4px;padding:4px 0;font-size:13px}.knowledge-entry__del{border:1px solid var(--danger);color:var(--danger);border-radius:var(--radius-sm);cursor:pointer;white-space:nowrap;background:0 0;padding:4px 12px;font-size:13px;transition:background .15s}.knowledge-entry__del:hover{background:var(--danger-bg)}.knowledge-entry__time{color:var(--text-tertiary);margin-top:8px;font-size:12px}.knowledge-empty{text-align:center;color:var(--text-tertiary);padding:60px 20px;font-size:15px}.teacher-main__header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px;display:flex}.subject-filter{color:var(--text-tertiary);align-items:center;gap:8px;display:flex}.subject-filter__select{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card) url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2375757c' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 10px center;color:var(--text-primary);cursor:pointer;appearance:none;outline:none;min-width:130px;padding:8px 32px 8px 12px;font-size:14px;transition:border-color .2s}.subject-filter__select:focus{border-color:var(--accent);box-shadow:var(--focus-ring)}.teacher-loading{color:var(--text-tertiary);flex:1;justify-content:center;align-items:center;font-size:15px;display:flex}.knowledge-upload-status{border-radius:var(--radius-sm);margin-top:12px;padding:10px 14px;font-size:13px;line-height:1.5}.knowledge-upload-status--success{color:var(--success);background:var(--success-bg);border:1px solid var(--success-border)}.knowledge-upload-status--error{color:var(--danger);background:var(--danger-bg);border:1px solid var(--danger-border)}@media (width<=768px){.teacher-body{flex-direction:column;gap:16px}.teacher-sidebar{border-radius:var(--radius-sm);gap:6px;width:100%;padding:6px;display:flex}.teacher-sidebar__btn{border-radius:var(--radius-sm);flex:1;justify-content:center;width:auto;padding:10px 8px;font-size:13px}.teacher-main{width:100%;overflow-y:visible}.teacher-main__title{font-size:19px}.knowledge-header{flex-direction:column;align-items:stretch;gap:10px}.student-card{flex-wrap:wrap;gap:8px}.question-detail__back{margin-bottom:14px}.knowledge-form{padding:18px 16px}}