:root {
            --question-gap: 6px;
        }
        body {
            font-family: "Noto Serif", "Noto Serif CJK SC", "Noto Sans CJK SC", "Noto Sans", "STSongti-SC", "PingFang SC", "Songti SC", serif;
            line-height: 1.65;
            color: #000;
            background: #fff;
            font-size: 14px;
        }
        .page {
            max-width: 720px;
            margin: 0 auto;
            padding: 0 12px;
        }
        .header { text-align: center; margin-bottom: 1.5rem; border-bottom: 2px solid #000; padding-bottom: 1rem; }
        /* 大题标题：不与后面内容分开 */
        .section-title {
            font-size: 16px;
            font-weight: bold;
            margin-top: 16px;
            margin-bottom: 10px;
            page-break-after: avoid;
            break-after: avoid;
        }
        /* 题目整体：不分页 */
        .question {
            margin-bottom: 14px;
            page-break-inside: avoid;
            break-inside: avoid;
            -webkit-column-break-inside: avoid;
        }
        /* 题目网格：不分页 */
        .question-grid {
            display: grid;
            grid-template-columns: auto 1fr;
            column-gap: 4px;
            row-gap: 6px;
            align-items: flex-start;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .question-lead {
            display: flex;
            gap: 4px;
            align-items: flex-start;
            font-weight: 600;
            font-size: 14px;
            line-height: 1.65;
            margin-top: 1px;
        }
        .question-lead.spacer { visibility: hidden; }
        .question-number { white-space: nowrap; margin-right: 2px; }
        .grading-boxes { gap: 4px; flex-wrap: wrap; align-items: center; }
        .grading-boxes span { vertical-align: middle; }
        /* 题目内容：防止孤行 */
        .question-main {
            font-size: 14px;
            line-height: 1.65;
            font-family: inherit;
            display: block;
            orphans: 3;
            widows: 3;
        }
        .question-score { margin-right: 6px; font-weight: 600; }
        .question-stem {
            display: inline-block;
            font-size: 14px;
            font-family: inherit;
            orphans: 3;
            widows: 3;
        }
        /* 选项容器：不分页 */
        .options {
            display: grid;
            row-gap: 8px;
            margin-top: 8px;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .options-grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 8px 12px;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .options-grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 8px 20px;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .options-grid-1 {
            display: grid;
            grid-template-columns: 1fr;
            gap: 8px;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        /* 单个选项：不分页 */
        .option {
            display: flex;
            align-items: baseline;
            font-size: 13.2px;
            line-height: 1.6;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .option strong { margin-right: 4px; flex: 0 0 auto; line-height: 1.6; }
        .option-value { display: inline; }
        .option-short { white-space: nowrap; }
        .option-long { white-space: normal; word-break: break-word; }
        .option-compact { line-height: inherit; }
        .option p, .option div { margin: 0; display: inline; }
        .option .katex {
            font-size: 1em !important;
            vertical-align: 0;
        }
        /* 仅提升分式可读性（不放大整行选项） */
        .option .katex .mfrac {
            font-size: 1em !important;
        }
        /* 选项里的分子分母保持可读且不挤压横线 */
        .option .katex .mfrac .mtight {
            font-size: 1em !important;
        }
        /* 分数线稍加粗 */
        .option .katex .frac-line {
            border-bottom-width: 0.055em !important;
        }
        /* 自动化实测后的分式微调：分母下移、分子上移，避免贴线 */
        .option .katex .mfrac .vlist > span:nth-child(1) {
            transform: translateY(0.24em) !important;
        }
        .option .katex .mfrac .vlist > span:nth-child(3) {
            transform: translateY(-0.16em) !important;
        }
        .option .katex-display {
            display: inline;
            margin: 0 !important;
            vertical-align: baseline;
        }
        /* 答案区域：不分页 */
        .answer-area {
            position: relative;
            margin-top: 4px;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .answer-area.boxy {
            min-height: 150px;
            border: 1.5px solid #444;
            border-radius: 6px;
            padding: 14px;
        }
        .answer-label {
            position: absolute;
            top: -10px;
            left: 10px;
            font-size: 10px;
            background: #fff;
            padding: 0 4px;
            color: #555;
            letter-spacing: 1px;
        }
        /* 答案元信息：不分页 */
        .answer-meta {
            font-size: 12px;
            color: #2f2f2f;
            line-height: 1.75;
            margin-top: 4px;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .answer-line + .answer-line { margin-top: 4px; }
        .solution-step {
            align-items: center;
            gap: 6px;
        }
        .step-box { display: inline-block; }
        .step-label { white-space: nowrap; }
        .solution-heading { font-weight: 700; }
        .solution-content { display: inline-block; line-height: 1.75; }
        /* 解析区域：不分页 */
        .solution-section {
            margin-top: 8px;
            padding: 6px 8px;
            page-break-inside: avoid;
            break-inside: avoid;
        }
        .solution-section strong {
            font-size: 13px;
        }
        .solution-parsed {
            margin-top: 6px;
            line-height: 1.8;
        }
        svg, .math-render svg {
            max-width: 100%;
            height: auto;
            display: block;
            /* 确保SVG中的文字和图形元素正确对齐 */
            shape-rendering: geometricPrecision;
            text-rendering: geometricPrecision;
        }
        /* 优化SVG中文字标签的显示 */
        svg text {
            font-family: "Noto Serif", "Noto Serif CJK SC", "Noto Sans CJK SC", "Noto Sans", "STSongti-SC", "PingFang SC", "Songti SC", serif !important;
            font-size: 13px !important;
            font-weight: bold;
            font-style: normal;
            dominant-baseline: middle;
            text-anchor: middle;
            alignment-baseline: central;
            /* 确保文字在点的正中央 */
            paint-order: stroke fill;
            stroke: none;
            fill: #000;
        }
        /* SVG中点标签的精确对齐 */
        svg text.label-point {
            font-size: 14px;
            font-weight: bold;
            dx: 0;
            dy: 0;
        }
        /* 确保SVG中的圆形和线条正确渲染 */
        svg circle, svg line, svg polygon, svg polyline {
            shape-rendering: geometricPrecision;
        }
        /* PDF图片容器：防止图片跨页分割 - 增强版 */
        .pdf-figure {
            break-inside: avoid;
            page-break-inside: avoid;
            -webkit-column-break-inside: avoid;
            break-before: avoid;
            break-after: avoid;
            page-break-before: avoid;
            page-break-after: avoid;
            margin: 8px 0;
            display: block;
            /* 确保图片不会在页面底部被截断 */
            min-height: 30px;
            /* 限制独立图块尺寸，避免图片压过文字 */
            max-height: 82mm;
        }
        .pdf-figure img {
            max-width: min(84%, 420px);
            max-height: 82mm;
            width: auto;
            height: auto;
            display: block;
            margin: 0 auto;
            object-fit: contain;
            box-sizing: border-box;
            -webkit-print-color-adjust: exact;
            print-color-adjust: exact;
            image-rendering: -webkit-optimize-contrast;
        }
        /* 题干中的图片样式（向后兼容） */
        .question-stem img,
        .question-main img,
        .question-content img,
        .answer-meta img,
        .answer-line img,
        .solution-content img,
        .solution-section img,
        .solution-parsed img {
            display: block;
            max-width: 220px;
            max-height: 60mm;
            width: auto;
            height: auto;
            margin: 6px auto;
            box-sizing: border-box;
            object-fit: contain;
            -webkit-print-color-adjust: exact;
            print-color-adjust: exact;
            image-rendering: -webkit-optimize-contrast;
        }
        /* 选项中的图片样式 - 防止超出容器 */
        .option img {
            max-width: 100%;
            height: auto;
            vertical-align: middle;
        }
        .question-stem .katex,
        .question-main .katex,
        .question-content .katex {
            font-size: 1em !important;
            /* 避免题干/解析中的行内公式整体下沉 */
            vertical-align: 0;
        }
        .question-stem .katex-display,
        .question-main .katex-display,
        .question-content .katex-display {
            margin: 0.35em 0 !important;
        }

        @include('pdf.partials.grading-scan-sheet-styles')