/* ===== 二级页 / 展会页样式（原 build_products.py 的 PAGE_CSS + EXHIBITION_CSS 合并去重） ===== */

        /* ===== 二级页面 ===== */
        main { padding-top: 76px; }
        .page-hero {
            background: var(--bg-dark);
            color: #f5f5f7;
            padding: 96px 48px 80px;
            position: relative;
            overflow: hidden;
        }
        .page-hero::after {
            content: '';
            position: absolute; inset: 0;
            background: radial-gradient(60% 80% at 80% 10%, rgba(0,102,204,0.25), transparent 60%),
                        radial-gradient(40% 60% at 10% 90%, rgba(212,160,23,0.12), transparent 60%);
            pointer-events: none;
        }
        .page-hero-inner { max-width: var(--max-width); margin: 0 auto; position: relative; z-index: 1; }
        .breadcrumb { font-size: 13px; color: rgba(245,245,247,0.55); margin-bottom: 24px; }
        .breadcrumb a { color: rgba(245,245,247,0.75); text-decoration: none; }
        .breadcrumb a:hover { color: #fff; }
        .breadcrumb span { margin: 0 8px; color: rgba(245,245,247,0.35); }
        .page-hero h1 { font-size: clamp(30px, 4.4vw, 52px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.15; text-wrap: balance; }
        .page-hero .en { color: rgba(245,245,247,0.5); font-size: 15px; letter-spacing: 0.06em; text-transform: uppercase; margin-top: 10px; }
        .page-hero .lead { margin-top: 24px; max-width: 760px; color: rgba(245,245,247,0.82); font-size: 17px; line-height: 1.8; }
        .hero-tags { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 10px; }
        .hero-tag {
            font-size: 13px; color: #f5f5f7;
            border: 1px solid rgba(245,245,247,0.25);
            padding: 6px 14px; border-radius: 999px;
        }
        .page-section { padding: 80px 48px; }
        .page-section:nth-of-type(even) { background: var(--bg-light); }

        /* 采购供应信息条（非 section，避免打乱 nth-of-type 节奏） */
        .supply-section {
            padding: 0 48px;
            margin-top: -48px;
            position: relative;
            z-index: 3;
        }
        .supply-section .page-section-inner { max-width: var(--max-width); margin: 0 auto; }
        .supply-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: 20px;
            box-shadow: 0 24px 60px -20px rgba(0,0,0,0.18), 0 4px 16px rgba(0,0,0,0.05);
            overflow: hidden;
        }
        .supply-item {
            display: flex; align-items: center; gap: 14px;
            padding: 22px 24px;
            border-left: 1px solid var(--border-light);
        }
        .supply-item:first-child { border-left: none; }
        .supply-icon {
            flex: none; width: 40px; height: 40px; border-radius: 12px;
            background: rgba(0,102,204,0.08); color: var(--accent-blue);
            display: flex; align-items: center; justify-content: center;
        }
        .supply-item .k { display: block; font-size: 12px; font-weight: 500; color: var(--text-tertiary); letter-spacing: 0.04em; margin-bottom: 3px; }
        .supply-item .v { display: block; font-size: 15px; font-weight: 600; color: var(--text-primary); text-wrap: pretty; }
        .supply-note { margin: 14px 4px 0; font-size: 14px; line-height: 1.65; color: var(--text-secondary); }
        @media (max-width: 768px) {
            .supply-section { padding: 0 20px; margin-top: -32px; }
            .supply-bar { grid-template-columns: repeat(2, 1fr); border-radius: 16px; }
            .supply-item { padding: 15px 16px; gap: 11px; }
            .supply-item:nth-child(odd) { border-left: none; }
            .supply-item:nth-child(n+3) { border-top: 1px solid var(--border-light); }
            .supply-icon { width: 34px; height: 34px; border-radius: 10px; }
            .supply-item .v { font-size: 14px; }
        }

        .page-section-inner { max-width: var(--max-width); margin: 0 auto; }
        .page-section h2 { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 8px; }
        .page-section .sub { color: var(--text-secondary); font-size: 15px; margin-bottom: 32px; }
        .table-block { margin-bottom: 48px; }
        .table-block h3 { font-size: 19px; font-weight: 600; margin-bottom: 16px; }
        .grade-search-left { margin: 0 0 24px; max-width: 420px; }
        .grade-search-left input { background: #fff; }
        .sub-tel { color: var(--accent-blue); text-decoration: none; }
        .table-wrap { overflow: auto; max-height: 78vh; border: 1px solid var(--border-light); border-radius: 16px; background: #fff; -webkit-overflow-scrolling: touch; }
        #specifications { scroll-margin-top: 76px; }
        .spec-summary, .spec-table tr { scroll-margin-top: 96px; }
        .spec-view-toggle, .mobile-spec-list { display: none; }
        .spec-view-toggle[hidden] { display: none; }
        .spec-search-status { color: var(--text-secondary); font-size: 14px; margin-bottom: 20px; }
        .spec-search-status:empty { display: none; }
        .table-wrap:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: 4px; }
        .table-hint {
            display: none;
            margin: 0 0 12px;
            font-size: 12px;
            color: var(--text-secondary);
            text-align: center;
            letter-spacing: 0.05em;
        }
        .table-block.is-scrollable > .table-hint { display: block; }
        .spec-table {
            --spec-model-width: 160px; --spec-docs-width: 104px;
            width: 100%; table-layout: auto; border-collapse: separate; border-spacing: 0; font-size: 14px;
        }
        /* auto 布局中压缩固定列至其内容下限，让中间参数列接收容器的剩余空间。 */
        .spec-table col.spec-model-col,
        .spec-table col.spec-docs-col,
        .spec-table col.spec-category-col { width: 1px; }
        .spec-table th, .spec-table td { min-width: 88px; }
        .spec-table th.spec-model-col,
        .spec-table td.model { min-width: var(--spec-model-min-width, var(--spec-model-width)); white-space: nowrap; }
        .spec-table.has-cat th:first-child,
        .spec-table.has-cat td:first-child { min-width: var(--spec-category-min-width, 88px); }
        .spec-table th {
            text-align: left; padding: 14px 16px;
            background: #fafafc; color: var(--text-tertiary);
            font-weight: 500; font-size: 13px; white-space: nowrap; line-height: 1.6;
            border-bottom: 1px solid var(--border-light);
            position: sticky; top: 0; z-index: 4;
        }
        .spec-table td { padding: 13px 16px; border-bottom: 1px solid var(--border-light); color: var(--text-primary); white-space: nowrap; background: #fff; }
        .spec-table td.spec-text { min-width: 220px; max-width: 340px; white-space: normal; line-height: 1.7; overflow-wrap: anywhere; }
        .spec-table tr:last-child td { border-bottom: none; }
        .spec-table tbody tr:hover td { background: #f8f8fa; }
        .spec-table th:first-child, .spec-table td:first-child {
            position: sticky; left: 0; z-index: 2;
            box-shadow: 1px 0 0 var(--border-light), 6px 0 12px -6px rgba(0,0,0,0.08);
        }
        .spec-table th:first-child { z-index: 5; background: #fafafc; }
        /* 含「类别」列的表格：类别+型号两列同时固定，型号列位置由 JS 实测第一列宽度写入 --catw */
        .spec-table.has-cat th:first-child, .spec-table.has-cat td:first-child {
            box-shadow: 1px 0 0 var(--border-light);
        }
        .spec-table.has-cat th:nth-child(2), .spec-table.has-cat td:nth-child(2) {
            position: sticky; left: var(--catw, 92px); z-index: 2;
            box-shadow: 1px 0 0 var(--border-light), 6px 0 12px -6px rgba(0,0,0,0.08);
        }
        .spec-table.has-cat th:nth-child(2) { z-index: 5; background: #fafafc; }
        /* 技术资料固定右侧；实色背景和分隔阴影覆盖横向滚动的参数。 */
        .spec-table .spec-docs {
            position: sticky; right: 0; z-index: 3;
            min-width: var(--spec-docs-min-width, var(--spec-docs-width));
            box-shadow: -1px 0 0 var(--border-light), -6px 0 12px -6px rgba(0,0,0,0.08);
        }
        .spec-table th.spec-docs { z-index: 6; background: #fafafc; }
        .spec-table td.model { font-weight: 600; }
        .tds-link {
            color: var(--accent-blue); text-decoration: none; font-size: 13px; font-weight: 500;
            display: inline-flex; align-items: center; gap: 5px;
            min-height: 44px; padding: 10px 6px; margin: -10px -6px;
        }
        .tds-link:hover { text-decoration: underline; }
        @media (max-width: 768px) {
            .spec-table { --spec-model-width: 88px; --spec-docs-width: 92px; }
            .spec-table .spec-docs { padding-inline: 12px; }
            /* 手机保留型号与资料两端固定，类别随参数滚动，给中间阅读区留出空间。 */
            .spec-table.has-cat td:first-child { position: static; box-shadow: none; }
            .spec-table.has-cat th:first-child { left: auto; z-index: 4; box-shadow: none; }
            .spec-table.has-cat th:nth-child(2), .spec-table.has-cat td:nth-child(2) { left: 0; }
            .spec-view-toggle:not([hidden]) {
                display: flex; width: fit-content; max-width: 100%; gap: 4px;
                padding: 4px; margin-bottom: 20px;
                background: #e8e8ed; border-radius: 12px;
            }
            .spec-view-toggle button {
                min-height: 44px; padding: 10px 16px; border: 0; border-radius: 8px;
                background: transparent; color: var(--text-secondary);
                font: inherit; font-size: 14px; font-weight: 500; cursor: pointer;
            }
            .spec-view-toggle button[aria-pressed="true"] { background: #fff; color: var(--text-primary); }
            .spec-view-toggle button:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: 2px; }
            .mobile-spec-list { display: block; margin-bottom: 24px; border-top: 1px solid var(--border-light); }
            .spec-summary { border-bottom: 1px solid var(--border-light); background: #fff; }
            .spec-summary summary { padding: 18px 16px 8px; cursor: pointer; list-style: none; min-height: 44px; }
            .spec-summary summary::-webkit-details-marker { display: none; }
            .spec-summary summary:focus-visible { outline: 2px solid var(--accent-blue); outline-offset: -2px; }
            .spec-model { display: block; color: var(--text-primary); font-size: 17px; font-weight: 600; overflow-wrap: anywhere; }
            .spec-preview { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-top: 7px; color: var(--text-secondary); font-size: 14px; line-height: 1.65; overflow-wrap: anywhere; }
            .spec-preview-tags { display: flex; flex-wrap: wrap; gap: 4px 12px; margin-top: 7px; font-size: 14px; color: var(--text-secondary); }
            .spec-expand-label { display: inline-flex; align-items: center; gap: 5px; min-height: 36px; color: var(--accent-blue); font-size: 14px; }
            .spec-expand-label svg { transition: transform .2s var(--transition-smooth); }
            .spec-summary details[open] .spec-expand-label svg { transform: rotate(180deg); }
            .spec-properties { margin: 0 16px; border-top: 1px solid var(--border-light); }
            .spec-property-title { margin: 20px 16px 8px; color: var(--text-primary); font-size: 14px; font-weight: 600; }
            .spec-properties > div { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 16px; padding: 11px 0; border-bottom: 1px solid var(--border-light); font-size: 15px; line-height: 1.7; overflow-wrap: anywhere; }
            .spec-properties dt { color: var(--text-secondary); }
            .spec-properties dd { color: var(--text-primary); font-variant-numeric: tabular-nums; }
            .spec-model-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; padding: 0 16px 12px; }
            .spec-model-actions a { display: inline-flex; align-items: center; min-width: 44px; min-height: 44px; padding: 10px 0; margin: 0; font-size: 14px; text-decoration: none; color: var(--accent-blue); }
            .spec-model-actions a:hover { text-decoration: underline; text-underline-offset: 3px; }
            #specifications.spec-enhanced:not(.show-full-table) .table-wrap,
            #specifications.spec-enhanced:not(.show-full-table) .table-hint { display: none; }
            #specifications.spec-enhanced.show-full-table .mobile-spec-list { display: none; }
        }
        .dl-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
        .dl-card {
            display: flex; align-items: center; gap: 14px;
            background: #fff; border: 1px solid var(--border-light); border-radius: 14px;
            padding: 16px 18px; text-decoration: none; color: var(--text-primary);
            transition: transform 0.3s var(--transition-smooth), box-shadow 0.3s var(--transition-smooth);
        }
        .dl-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
        .dl-icon {
            flex: none; width: 40px; height: 40px; border-radius: 10px;
            background: rgba(0,102,204,0.08); color: var(--accent-blue);
            display: flex; align-items: center; justify-content: center;
        }
        .dl-name { font-size: 14px; font-weight: 600; line-height: 1.35; }
        .dl-meta { font-size: 12px; color: var(--text-secondary); margin-top: 2px; }
        .notes { background: #fff; border: 1px solid var(--border-light); border-radius: 16px; padding: 28px 32px; }
        #test-notes { scroll-margin-top: 76px; }
        .notes-group + .notes-group { margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--border-light); }
        .notes-group h3 { font-size: 15px; font-weight: 600; color: var(--text-primary); line-height: 1.6; margin-bottom: 8px; overflow-wrap: anywhere; }
        .notes-scope { font-size: 13px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 8px; overflow-wrap: anywhere; }
        .notes li { font-size: 14px; color: var(--text-secondary); line-height: 1.9; margin-left: 18px; overflow-wrap: anywhere; }
        .notes li + li { margin-top: 5px; }
        .cta-band {
            background: var(--bg-dark); color: #f5f5f7;
            padding: 72px 48px; text-align: center;
        }
        .cta-band h2 { font-size: 26px; font-weight: 700; margin-bottom: 12px; }
        .cta-band p { color: rgba(245,245,247,0.65); font-size: 15px; margin-bottom: 28px; }
        .cta-band .btn-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
        .btn-light {
            display: inline-block; background: #fff; color: #000; text-decoration: none;
            font-size: 14px; font-weight: 500; padding: 12px 28px; border-radius: 999px;
        }
        .btn-ghost {
            display: inline-block; color: #f5f5f7; text-decoration: none;
            font-size: 14px; padding: 12px 28px; border-radius: 999px;
            border: 1px solid rgba(245,245,247,0.35);
        }
        @media (max-width: 768px) {
            .page-hero { padding: 72px 24px 56px; }
            .page-section { padding: 56px 24px; }
            .cta-band { padding: 56px 24px; }
            .notes { padding: 20px 22px; }
            .supply-item .k { font-size: 14px; letter-spacing: 0; }
            .table-hint, .dl-meta, .notes-scope { font-size: 14px; line-height: 1.7; }
            .tds-link { font-size: 14px; }
            .notes li { font-size: 15px; line-height: 1.85; }
            /* 仅收紧产品内容；导航与页脚保持原有字号及触摸尺寸。 */
            main[data-product-title] .page-hero { padding: 48px 20px; }
            main[data-product-title] .breadcrumb { margin-bottom: 20px; line-height: 1.6; }
            main[data-product-title] .page-hero h1 { font-size: clamp(28px, 6.6vw, 36px); line-height: 1.2; }
            main[data-product-title] .page-hero .en { margin-top: 8px; font-size: 13px; line-height: 1.55; letter-spacing: 0.04em; }
            main[data-product-title] .page-hero .lead { margin-top: 20px; font-size: 16px; line-height: 1.75; }
            main[data-product-title] .hero-tags { margin-top: 20px; gap: 8px; }
            main[data-product-title] .hero-tag { padding: 5px 12px; }
            main[data-product-title] .supply-item .k { font-size: 13px; letter-spacing: 0; }
            main[data-product-title] .supply-note { margin-top: 12px; font-size: 13px; }
            main[data-product-title] .page-section { padding: 44px 20px; }
            main[data-product-title] .page-section h2 { font-size: clamp(24px, 4.5vw, 28px); line-height: 1.3; }
            main[data-product-title] .page-section .sub { margin-bottom: 24px; font-size: 14px; line-height: 1.65; }
            main[data-product-title] .table-block { margin-bottom: 36px; }
            main[data-product-title] .table-block h3 { margin-bottom: 12px; font-size: 17px; line-height: 1.45; }
            main[data-product-title] .grade-search-left { margin-bottom: 16px; }
            /* 保持 16px 输入字号，避免 iOS 聚焦输入时自动放大页面。 */
            main[data-product-title] .grade-search-left input { height: 48px; font-size: 16px; }
            main[data-product-title] .spec-search-status { margin-bottom: 16px; font-size: 13px; line-height: 1.65; }
            main[data-product-title] .spec-view-toggle { margin-bottom: 16px; }
            main[data-product-title] .spec-table th,
            main[data-product-title] .spec-table td { padding: 12px; }
            main[data-product-title] .table-hint,
            main[data-product-title] .dl-meta,
            main[data-product-title] .notes-scope { font-size: 13px; line-height: 1.7; }
            main[data-product-title] .tds-link { font-size: 14px; }
            main[data-product-title] .spec-summary summary { padding: 16px 14px 6px; }
            main[data-product-title] .spec-model { font-size: 16px; line-height: 1.5; }
            main[data-product-title] .spec-preview,
            main[data-product-title] .spec-preview-tags { margin-top: 6px; }
            main[data-product-title] .spec-properties { margin-inline: 14px; }
            main[data-product-title] .spec-property-title { margin: 16px 14px 8px; }
            main[data-product-title] .spec-properties > div { gap: 12px; padding: 10px 0; font-size: 14px; }
            main[data-product-title] .spec-model-actions { padding: 0 14px 10px; }
            main[data-product-title] .dl-grid { gap: 12px; }
            main[data-product-title] .dl-card { padding: 14px; gap: 12px; }
            main[data-product-title] .notes { padding: 18px; }
            main[data-product-title] .notes li { font-size: 14px; line-height: 1.8; }
            main[data-product-title] .notes-group + .notes-group { margin-top: 18px; padding-top: 18px; }
            main[data-product-title] .cta-band { padding: 44px 20px; }
            main[data-product-title] .cta-band h2 { font-size: 24px; line-height: 1.3; }
            main[data-product-title] .cta-band p { margin-bottom: 24px; font-size: 14px; line-height: 1.75; }
            main[data-product-title] .btn-light,
            main[data-product-title] .btn-ghost { min-height: 44px; }
        }
        @media (max-width: 360px) {
            main[data-product-title] .page-hero { padding: 40px 16px 44px; }
            main[data-product-title] .page-hero h1 { font-size: 26px; }
            main[data-product-title] .page-hero .lead { margin-top: 18px; font-size: 15px; }
            main[data-product-title] .breadcrumb { margin-bottom: 18px; }
            main[data-product-title] .breadcrumb span { margin-inline: 5px; }
            main[data-product-title] .supply-section { padding-inline: 16px; }
            main[data-product-title] .supply-item { padding: 13px 12px; gap: 8px; }
            main[data-product-title] .page-section { padding: 40px 16px; }
            /* 窄屏为类别、型号与资料列留出完整空间，正文仍沿用 16px 边距。 */
            main[data-product-title] .table-wrap { margin-inline: -4px; }
            main[data-product-title] .page-section h2,
            main[data-product-title] .cta-band h2 { font-size: 22px; }
            main[data-product-title] .spec-table { font-size: 13px; }
            main[data-product-title] .spec-table th,
            main[data-product-title] .spec-table td { padding: 10px; }
            main[data-product-title] .tds-link { font-size: 13px; }
            main[data-product-title] .notes { padding: 16px; }
            main[data-product-title] .cta-band { padding: 40px 16px; }
        }
        .ex-page-hero {
            background: var(--bg-dark);
            color: #f5f5f7;
            padding: 72px 48px 0;
            position: relative;
            overflow: hidden;
        }
        .ex-page-hero-inner { max-width: var(--max-width); margin: 0 auto; position: relative; z-index: 1; }
        .ex-page-hero h1 { font-size: clamp(28px, 4vw, 46px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.2; }
        .ex-page-hero .en { color: rgba(245,245,247,0.5); font-size: 14px; letter-spacing: 0.06em; text-transform: uppercase; margin-top: 10px; }
        .ex-countdown {
            display: inline-flex; align-items: baseline; gap: 6px;
            margin-top: 22px; font-size: 14px; font-weight: 500;
            color: #ffb500; background: rgba(255,181,0,0.1);
            border: 1px solid rgba(255,181,0,0.25);
            padding: 8px 18px; border-radius: 999px;
        }
        .ex-countdown strong { font-size: 18px; font-weight: 700; }
        .ex-banner {
            margin: 40px auto 0; max-width: var(--max-width);
            border-radius: 20px; overflow: hidden;
            border: 1px solid rgba(255,255,255,0.1);
            position: relative; z-index: 1;
        }
        .ex-banner img { width: 100%; height: auto; aspect-ratio: 1503/502; display: block; }
        .ex-section { padding: 80px 48px; }
        .ex-section:nth-of-type(even) { background: var(--bg-light); }
        .ex-section-inner { max-width: var(--max-width); margin: 0 auto; }
        .ex-section h2 { font-size: 28px; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 8px; }
        .ex-section .sub { color: var(--text-secondary); font-size: 15px; margin-bottom: 32px; }
        .ex-info-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
        .ex-info-card {
            background: #fff; border: 1px solid var(--border-light); border-radius: 18px;
            padding: 26px 24px; transition: all 0.3s var(--transition-smooth);
        }
        .ex-info-card:hover { transform: translateY(-3px); box-shadow: 0 12px 30px rgba(0,0,0,0.07); }
        .ex-info-card .k {
            font-size: 12px; font-weight: 500; color: var(--text-secondary);
            text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 10px;
            display: flex; align-items: center; gap: 8px;
        }
        .ex-info-card .k svg { width: 15px; height: 15px; color: var(--accent-blue); }
        .ex-info-card .v { font-size: 18px; font-weight: 700; letter-spacing: -0.01em; line-height: 1.4; text-wrap: pretty; }
        .ex-info-card .v small { display: block; font-size: 13px; font-weight: 400; color: var(--text-tertiary); margin-top: 4px; }
        .ex-info-card.highlight { background: #000; border-color: #000; }
        .ex-info-card.highlight .k { color: rgba(245,245,247,0.6); }
        .ex-info-card.highlight .k svg { color: #ffb500; }
        .ex-info-card.highlight .v { color: #ffb500; font-size: 26px; }
        .ex-info-card.highlight .v small { color: rgba(245,245,247,0.55); }
        .ex-concurrent { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
        .ex-concurrent li {
            list-style: none; background: #fff; border: 1px solid var(--border-light);
            border-radius: 12px; padding: 16px 18px; font-size: 14px; line-height: 1.5;
            color: var(--text-primary);
        }
        .ex-past { display: grid; grid-template-columns: 320px 1fr; gap: 40px; align-items: center; }
        .ex-past img {
            width: 100%; height: auto; aspect-ratio: 3/4; object-fit: cover;
            border-radius: 18px; border: 1px solid var(--border-light); display: block;
        }
        .ex-past h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
        .ex-past p { color: var(--text-secondary); font-size: 15px; line-height: 1.8; }
        .ex-past .tag {
            display: inline-block; margin-top: 14px; font-size: 12px; color: var(--text-tertiary);
            border: 1px solid var(--border-light); border-radius: 999px; padding: 5px 14px;
        }
        @media (max-width: 1024px) {
            .ex-info-grid { grid-template-columns: repeat(2, 1fr); }
            .ex-concurrent { grid-template-columns: repeat(2, 1fr); }
            .ex-past { grid-template-columns: 1fr; gap: 24px; }
            .ex-past img { max-width: 360px; }
        }
        @media (max-width: 640px) {
            .ex-page-hero { padding: 56px 20px 0; }
            .ex-section { padding: 56px 20px; }
            .ex-info-grid, .ex-concurrent { grid-template-columns: 1fr; }
        }