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4",serif;font-size:21px;font-weight:600}.chapter-link{color:var(--brand-strong);white-space:nowrap;font-size:11.5px;font-weight:600;text-decoration:none}.chapter-link:hover{text-decoration:underline}.chapter-timeline{margin:0;padding:0;list-style:none;position:relative}.chapter-timeline:before{content:"";background:var(--paper-line-strong);width:1px;position:absolute;top:6px;bottom:6px;left:11px}.timeline-item{align-items:center;gap:16px;margin-left:0;padding:14px 0;display:flex;position:relative}.timeline-item+.timeline-item{border-top:1px solid var(--paper-line)}.timeline-dot{z-index:1;border:1.5px solid var(--paper-line-strong);background:var(--surface);width:23px;height:23px;color:var(--ink-muted);border-radius:50%;flex-shrink:0;place-items:center;font-size:10px;font-weight:700;display:grid;position:relative}.timeline-item.passed .timeline-dot{border-color:var(--success);color:var(--success-strong);background:var(--success-soft)}.timeline-item.next .timeline-dot,.timeline-item.retry .timeline-dot{border-color:var(--accent);color:var(--accent-strong);background:var(--accent-soft)}.timeline-item.later{opacity:.55}.timeline-copy{flex:1;min-width:0}.timeline-copy strong{color:var(--ink);font-size:16px;font-weight:600;display:block}.timeline-copy small{color:var(--ink-muted);margin-top:2px;font-size:14px;display:block}.timeline-link{min-height:44px;color:var(--brand-strong);flex-shrink:0;align-items:center;margin:-8px -4px;padding:8px 4px;font-size:11px;font-weight:600;text-decoration:none;display:inline-flex}.timeline-link:hover{text-decoration:underline}.timeline-link span{margin-left:3px}.workbook-footnote{color:var(--ink-muted);text-align:center;margin:0;font-size:14px;line-height:1.7}.workbook-footnote a{color:var(--brand-strong)}@media (max-width:900px){.workbook-nav{flex-wrap:wrap;gap:14px;padding:12px 16px}.workbook-nav-links{border-top:1px solid var(--paper-line);scrollbar-width:none;flex-basis:100%;order:3;gap:2px;padding-top:6px;overflow-x:auto}.workbook-nav-links::-webkit-scrollbar{display:none}.workbook-nav-link{white-space:nowrap;padding:8px 10px}.workbook-streak,.theme-toggle-label{display:none}.theme-toggle{padding:6px 10px}.workbook-sheet{gap:24px;width:auto;padding:20px 16px 60px}.workbook-page{grid-template-columns:1fr}.page-margin{border-right:0;border-bottom:1px solid var(--paper-line-strong);flex-direction:row;justify-content:flex-start;gap:10px;padding:12px 16px}.page-margin-label{writing-mode:horizontal-tb}.page-body{padding:20px 16px 24px}.page-columns{grid-template-columns:1fr;gap:22px}.chapter-section,.track-overview{padding:20px 16px 24px}.track-overview-grid{grid-template-columns:1fr}.track-home-card>p{min-height:0}.continue-cta{justify-content:center;width:100%}}