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.2s;display:flex;position:relative}.option-item:hover{border-color:var(--accent,#5ec4a4);background:var(--primary-soft,#eaf5f1)}.option-item:has(input:checked){border-color:var(--primary,#3d9980);background:var(--primary-soft,#eaf5f1);box-shadow:0 0 0 3px #3d99801a}.option-item input{width:auto;accent-color:var(--primary,#3d9980);flex-shrink:0;margin-top:3px}.option-letter{background:var(--panel-soft,#f0f4f2);width:26px;height:26px;color:var(--muted,#6b8f85);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:13px;font-weight:600;transition:all .2s;display:inline-flex}.option-item:has(input:checked) .option-letter{background:var(--primary,#3d9980);color:#fff}.option-text{color:var(--ink,#1a3a34);flex:1;font-size:14px;line-height:1.6}.exam-textarea{border-radius:var(--radius,8px);border:1.5px solid var(--line-soft,#e8ede9);resize:vertical;background:var(--surface-solid);width:100%;min-height:240px;padding:16px;font-family:inherit;font-size:15px;line-height:1.7;transition:border-color .2s}.exam-textarea:focus{border-color:var(--primary,#3d9980);outline:none;box-shadow:0 0 0 3px #3d99801a}.question-card{gap:14px;display:grid}.question-index{border-radius:var(--radius);background:var(--panel-soft);border:1px solid var(--line-soft);min-width:42px;height:42px;color:var(--ink);justify-content:center;align-items:center;font-size:14px;font-weight:500;display:flex}.question-index:hover{border-color:var(--primary);background:var(--primary-soft)}.question-index.answered{background:var(--ok-soft);border-color:var(--accent);color:var(--primary-dark)}.question-index.current{background:var(--primary);border-color:var(--primary);color:#fff;box-shadow:0 2px 8px #3d99804d}.grading-shell{grid-template-columns:240px 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button:hover{color:#fff;background:#ffffff1f;border-color:#fff3}.grading-nav button.scored{color:var(--sidebar-accent,#5ec4a4);background:#5ec4a426;border-color:#5ec4a44d}.grading-nav button.current{background:var(--sidebar-accent,#5ec4a4);border-color:var(--sidebar-accent,#5ec4a4);color:#fff;box-shadow:0 2px 8px #5ec4a44d}.grading-nav button.auto-scored{color:#ffc107;background:#ffc10726;border-color:#ffc1074d}.grading-sidebar-actions{border-top:1px solid #ffffff14;flex-direction:column;gap:8px;margin-top:auto;padding-top:14px;display:flex}.grading-sidebar-actions .primary-btn,.grading-sidebar-actions .ghost-btn{justify-content:center;width:100%}.grading-sidebar-actions .ghost-btn{color:var(--sidebar-text,#a8c5be);background:#ffffff0f;border:1px solid #ffffff1f}.grading-sidebar-actions .ghost-btn:hover{color:#fff;background:#ffffff1f}#gradingMessage{text-align:center;min-height:16px;color:var(--sidebar-accent,#5ec4a4);margin:4px 0 0;font-size:12px}.grading-question-area{background:var(--bg,#f5f7f6);flex-direction:column;height:100dvh;display:flex;overflow:hidden}.grading-question-header{background:var(--surface-solid);border-bottom:1px solid var(--line-soft,#e8ede9);flex-shrink:0;align-items:center;gap:12px;padding:16px 28px;display:flex}.grading-question-number{color:var(--primary,#3d9980);white-space:nowrap;font-size:14px;font-weight:700}.grading-question-type{background:var(--primary-soft,#eaf5f1);color:var(--primary,#3d9980);white-space:nowrap;border-radius:100px;align-items:center;padding:2px 10px;font-size:12px;font-weight:500;display:inline-flex}.grading-question-title{color:var(--ink,#1a3a34);flex:1;margin:0;font-size:15px;font-weight:500;line-height:1.6}.grading-question-body{flex:1;padding:24px 28px;overflow-y:auto}.grading-answer-section{margin-bottom:20px}.grading-answer-label{color:var(--muted,#6b8f85);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px;font-size:13px;font-weight:600}.grading-answer-box{border-radius:var(--radius,8px);border:1.5px solid var(--line-soft,#e8ede9);background:var(--surface-solid);padding:14px 16px;font-size:14px;line-height:1.7}.grading-answer-box.student-answer{border-left:3px solid var(--primary,#3d9980)}.grading-answer-box.reference-answer{background:var(--ref-answer-bg);border-left:3px solid #4a90d9}.grading-answer-box.no-answer{color:var(--muted,#6b8f85);font-style:italic}.grading-score-section{border-top:1px solid var(--line-soft,#e8ede9);margin-top:8px;padding:16px 0}.grading-score-row{align-items:center;gap:12px;display:flex}.grading-score-row label{color:var(--ink,#1a3a34);white-space:nowrap;font-size:14px;font-weight:600}.grading-score-input{border-radius:var(--radius,8px);border:1.5px solid 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