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var(--accent);background:var(--accent);color:var(--paper);cursor:pointer;white-space:nowrap;justify-content:center;align-items:center;padding:0 1rem;text-decoration:none;display:inline-flex}.vg-button:disabled{opacity:.55;cursor:default}.vg-button--secondary{background:var(--surface-card);color:var(--text-body);border-color:var(--border-hairline)}.vg-button--quiet{color:var(--accent);background:0 0;border-color:#0000}.vg-button--quiet[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent)}.vg-dialog{border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-page);width:calc(100% - 2rem);max-width:26rem;color:var(--text-body);max-height:min(90vh,40rem);margin:auto;padding:1.5rem;overflow-y:auto}.vg-dialog::backdrop{background:#16202b73}.vg-dialog-close{min-height:var(--tap);min-width:var(--tap);color:var(--text-quiet);cursor:pointer;background:0 0;border:0;font-size:1rem;position:absolute;top:.75rem;right:.75rem}.vg-form{gap:var(--space-3);flex-direction:column;display:flex;position:relative}.vg-form h1,.vg-form h2{font-family:var(--font-ui);margin:0 0 var(--space-1)}.vg-field{font-family:var(--font-ui);font-size:var(--text-small-size);color:var(--text-quiet);flex-direction:column;gap:.3rem;display:flex}.vg-field input,.vg-field textarea,.vg-field select{min-height:48px;font-size:var(--text-ui-size);color:var(--text-body);background:var(--surface-page);border:1px solid var(--border-hairline);border-radius:var(--radius-card);padding:0 .75rem}.vg-field textarea{min-height:6rem;padding:.6rem .75rem}.vg-field input:focus-visible,.vg-field textarea:focus-visible,.vg-field select:focus-visible{outline:3px solid var(--accent-soft);outline-offset:0;border-color:var(--accent)}.vg-field--invalid input,.vg-field--invalid textarea{border-color:var(--verdict-fail)}.vg-field-error{font-family:var(--font-ui);font-size:var(--text-small-size);color:var(--verdict-fail);margin:0}.vg-field--choice{border:none;margin:0;padding:0}.vg-field--choice legend{margin:0 0 .3rem;padding:0}.vg-choice{min-height:44px;font-family:var(--font-ui);font-size:var(--text-ui-size);color:var(--text-body);background:var(--surface-page);border:1px solid var(--border-hairline);border-radius:var(--radius-card);cursor:pointer;align-items:center;gap:.6rem;padding:.5rem .75rem;display:flex}.vg-choice+.vg-choice{margin-top:.5rem}.vg-choice input{flex-shrink:0}.vg-choice:has(input:focus-visible){outline:3px solid var(--accent-soft);outline-offset:0;border-color:var(--accent)}.vg-field--invalid .vg-choice{border-color:var(--verdict-fail)}.vg-form-hint{font-family:var(--font-ui);font-size:var(--text-small-size);color:var(--text-quiet);margin:0}.vg-form-rule{border:0;border-top:1px solid var(--border-hairline);width:100%;margin:var(--space-1) 0}.vg-form-success{border:1px solid var(--accent);border-radius:var(--radius-card);background:var(--surface-card-active);font-family:var(--font-ui);padding:1rem 1.1rem}.prose h1,.prose h2,.prose h3{font-family:var(--font-ui);line-height:var(--leading-tight);letter-spacing:var(--tracking-heading)}.prose h1{font-size:var(--text-h1-size);margin:2.5rem 0 .5rem}.prose h3{margin:var(--space-7) 0 .5rem;font-size:1.15rem}.prose h2{font-size:var(--text-h2-size);margin:var(--space-8) 0 var(--space-3);border-top:1px solid var(--border-hairline);padding-top:1.5rem}.prose p,.prose ul,.prose ol{margin:0 0 var(--space-4)}.prose li{margin-bottom:var(--space-1)}.prose strong{font-weight:var(--weight-strong)}.lede{font-size:var(--text-lede-size);color:var(--text-quiet);margin:0 0 var(--space-7)}.vg-callout{border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-card);margin:1.6rem 0;padding:1rem 1.1rem}.vg-callout strong,.vg-keyterm{font-weight:var(--weight-strong)}.vg-keyterm--first{color:var(--accent);box-shadow:0 1px 0 var(--accent-soft)}.prose .katex-display{text-align:center;font-family:var(--font-math);margin:1.6rem 0;padding:.25rem 0;font-size:1.25rem;overflow:auto hidden}.prose .katex-display>.katex{font-size:1em}.prose figure{margin:var(--space-6) 0}.vg-figure .vg-stage{width:calc(.8 * (100% + 2 * min(var(--breakout), var(--space-5))));border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-page);margin-inline:auto}.vg-figure figcaption{margin-top:var(--space-2);font-family:var(--font-ui);font-size:var(--text-caption-size);color:var(--text-quiet)}.vg-figure .vg-readout{margin:var(--space-3) 0 0;font-family:var(--font-ui);font-size:var(--text-ui-size);font-variant-numeric:var(--numerals-live);color:var(--text-body)}.vg-figure .vg-fallback{border:2px dashed var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-card);min-height:10rem;color:var(--text-quiet);font-family:var(--font-ui);font-size:var(--text-small-size);text-align:center;place-items:center;margin:0;padding:1rem;display:grid}.lesson-shell{gap:var(--space-7);max-width:58rem;padding:0 var(--space-5) 4rem;grid-template-columns:1fr;margin:0 auto;display:grid}.lesson-shell>article{margin:0 auto}.lesson-rail{display:none}@media (width>=1100px){.lesson-shell{grid-template-columns:17rem 1fr;gap:5rem;max-width:68rem}.lesson-shell>article{margin:0}.lesson-rail{align-self:start;max-height:calc(100vh - 8rem);margin-top:4.5rem;display:block;position:sticky;top:76px;overflow-y:auto}.lesson-shell .vg-figure .vg-stage{width:calc(.8 * (100% + 2 * var(--breakout)));margin-inline:auto}}.lesson-rail{font-family:var(--font-ui)}.rail-chapter-link{font-size:var(--text-small-size);font-weight:var(--weight-ui);color:var(--text-link);margin-bottom:var(--space-2);text-decoration:none;display:block}.rail-progress{border-radius:var(--radius-card);background:var(--surface-card);height:5px;overflow:hidden}.rail-progress-fill{background:var(--accent);height:100%}.rail-progress-label{margin:.4rem 0 var(--space-3);font-size:var(--text-caption-size);color:var(--text-quiet)}.rail-list{margin:0;padding:0;list-style:none}.rail-row{min-height:var(--tap);padding:0 var(--space-2);border-radius:var(--radius-card);color:var(--text-body);font-size:var(--text-small-size);align-items:center;gap:.5rem;text-decoration:none;display:flex}.rail-row:hover,.rail-row:focus-visible{background:var(--surface-card)}.rail-row--current{background:var(--surface-card-active);border:1px solid var(--accent);font-weight:var(--weight-ui)}.rail-mark{text-align:center;width:1.1rem;color:var(--text-quiet);flex:none}.rail-row--current .rail-mark{color:var(--accent)}.lesson-exercise-cta{margin:var(--space-8) 0 var(--space-2)}.lesson-neighbours{justify-content:space-between;gap:var(--space-4);margin-top:var(--space-8);border-top:1px solid var(--border-hairline);font-family:var(--font-ui);font-size:var(--text-small-size);padding-top:1.5rem;display:flex}.lesson-neighbours a{min-height:var(--tap);align-items:center;text-decoration:none;display:inline-flex}.lesson-neighbours .next{text-align:right;margin-left:auto}.page-h1{font-family:var(--font-ui);font-size:2.2rem;line-height:var(--leading-tight);letter-spacing:var(--tracking-heading);margin:var(--space-8) 0 .5rem}.page-lede{max-width:var(--measure)}.chapter-list{margin:var(--space-7) 0 0;gap:var(--space-4);padding:0;list-style:none;display:grid}.chapter-card{gap:var(--space-4);padding:var(--space-5) var(--space-6);border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-card);color:inherit;grid-template-columns:3rem 1fr;text-decoration:none;display:grid;position:relative}a.chapter-card:hover,a.chapter-card:focus-visible{border-color:var(--border-active);background:var(--surface-card-active)}.chapter-card--inert{cursor:default}.chapter-sign{border-radius:var(--radius-card);background:var(--surface-page);border:1px solid var(--border-hairline);width:1.75rem;height:1.75rem;font-family:var(--font-ui);font-weight:var(--weight-strong);color:var(--text-quiet);justify-content:center;align-items:center;display:flex;position:absolute;top:.9rem;right:1rem}.chapter-chip{border-radius:var(--radius-card);background:var(--surface-page);border:1px solid var(--border-hairline);width:3rem;height:3rem;font-family:var(--font-ui);font-size:1.4rem;font-weight:var(--weight-ui);font-variant-numeric:var(--numerals-live);justify-content:center;align-items:center;display:flex}.chapter-body{display:block}.chapter-title{font-family:var(--font-ui);font-size:1.2rem;font-weight:var(--weight-ui);display:block}.chapter-line{margin-top:.3rem;font-size:1.05rem;display:block}.chapter-topics{font-size:var(--text-ui-size);color:var(--text-quiet);max-width:44rem;margin-top:.5rem;display:block}.chapter-meta{font-family:var(--font-ui);color:var(--text-quiet);flex-wrap:wrap;align-items:center;gap:.5rem;margin-top:.75rem;font-size:.78rem;display:flex}.chapter-strand{border-radius:var(--radius-card);background:var(--surface-card-active);border:1px solid var(--border-active);color:var(--ink);font-weight:var(--weight-ui);white-space:nowrap;padding:.15rem .5rem}.chapter-rests{font-family:var(--font-ui);color:var(--text-quiet);margin-top:.4rem;font-size:.85rem;display:block}.chapter-footnote{font-family:var(--font-ui);font-size:var(--text-small-size);color:var(--text-quiet);margin:var(--space-6) 0 0;max-width:var(--measure)}.chapter-empty{padding:var(--space-5);border:2px dashed var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-card);max-width:var(--measure)}.chapter-empty strong{font-family:var(--font-ui);font-size:1.15rem;display:block}.chapter-empty span{font-size:var(--text-ui-size);color:var(--text-quiet);margin-top:.6rem;display:block}.chapter-eyebrow{font-family:var(--font-ui);font-size:var(--text-small-size);color:var(--text-quiet);margin:var(--space-8) 0 .4rem}.item-list{margin:var(--space-7) 0 0;gap:var(--space-4);grid-template-columns:repeat(auto-fit,minmax(min(100%,24rem),1fr));padding:0;list-style:none;display:grid}.item-list--single-column{grid-template-columns:1fr}.item-card{padding:var(--space-5) var(--space-6);border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-card);color:inherit;flex-direction:column;gap:.5rem;text-decoration:none;display:flex;position:relative}a.item-card:hover,a.item-card:focus-visible{border-color:var(--border-active);background:var(--surface-card-active)}.item-card--inert{cursor:default}.item-title{font-family:var(--font-ui);font-size:1.15rem;font-weight:var(--weight-ui)}.item-description{font-size:var(--text-ui-size);color:var(--text-quiet)}.item-meta{font-family:var(--font-ui);color:var(--text-quiet);justify-content:space-between;gap:.5rem;margin-top:auto;font-size:.78rem;display:flex}.item-tag{border-radius:var(--radius-card);background:var(--surface-page);border:1px solid var(--border-hairline);font-weight:var(--weight-ui);white-space:nowrap;padding:.15rem .5rem}.chapter-nav{justify-content:space-between;gap:var(--space-4);margin-top:var(--space-8);border-top:1px solid var(--border-hairline);font-family:var(--font-ui);font-size:var(--text-small-size);padding-top:1.5rem;display:flex}.chapter-nav a{min-height:var(--tap);align-items:center;text-decoration:none;display:inline-flex}.chapter-nav .next{text-align:right;margin-left:auto}.home-hero{margin-top:var(--space-8);grid-template-columns:repeat(auto-fit,minmax(min(100%,22rem),1fr));align-items:center;gap:2rem 3rem;display:grid}.home-h1{font-family:var(--font-ui);letter-spacing:var(--tracking-heading);margin:0 0 .75rem;font-size:2.6rem;line-height:1.1}.home-lede{margin:0 0 var(--space-6)}.home-ctas{gap:var(--space-2);flex-wrap:wrap;display:flex}.home-cards{gap:var(--space-4);margin-top:var(--space-7);grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr));display:grid}.home-card{gap:var(--space-2);padding:var(--space-5);border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-card);flex-direction:column;display:flex}.home-card--accent{border-color:var(--accent);background:var(--surface-card-active)}.home-card--accent .vg-button{align-self:start}.home-card-title{font-family:var(--font-ui);font-size:1.15rem;font-weight:var(--weight-ui)}.home-card-body{font-size:var(--text-ui-size);color:var(--text-quiet)}.subscribe-from{margin:var(--space-4) 0 0;border:1px solid var(--accent);border-radius:var(--radius-card);background:var(--surface-card-active);font-family:var(--font-ui);max-width:var(--measure);padding:1rem 1.1rem}.plan-list{gap:var(--space-4);margin:var(--space-7) 0;grid-template-columns:repeat(auto-fit,minmax(min(100%,14rem),1fr));display:grid}.plan-card{align-items:flex-start;gap:var(--space-3);padding:var(--space-5);border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-card);flex-direction:column;display:flex}.plan-card--highlight{border-color:var(--accent);background:var(--surface-card-active)}.plan-name{font-family:var(--font-ui);font-size:1.1rem;font-weight:var(--weight-ui)}.plan-price{font-family:var(--font-ui);font-variant-numeric:var(--numerals-live);font-size:1.8rem}.tier-table{table-layout:fixed;border-collapse:collapse;width:100%;font-family:var(--font-ui);font-size:var(--text-small-size)}.tier-table th,.tier-table td{text-align:left;border-bottom:1px solid var(--border-hairline);padding:.6rem .75rem}.tier-table thead th:first-child{width:50%}.account-section{margin-top:var(--space-8);border-top:1px solid var(--border-hairline);padding-top:1.5rem}.account-section:first-of-type{margin-top:var(--space-7)}.account-heading{font-family:var(--font-ui);font-size:var(--text-h2-size);margin:0 0 var(--space-3)}.account-progress-row{align-items:center;gap:var(--space-3);margin-bottom:var(--space-2);font-family:var(--font-ui);font-size:var(--text-small-size);grid-template-columns:8rem 1fr auto;display:grid}.account-progress-count{font-variant-numeric:var(--numerals-live);color:var(--text-quiet)}.vg-field--inline{align-items:center;gap:var(--space-2);flex-direction:row}.rating-widget{right:var(--space-4);bottom:var(--space-4);z-index:10;font-family:var(--font-ui);position:fixed}.rating-pill{min-height:var(--tap);border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-page);color:var(--text-body);font-family:var(--font-ui);font-size:var(--text-small-size);font-weight:var(--weight-ui);cursor:pointer;padding:0 1rem}.rating-panel{width:min(20rem,100vw - 2rem);padding:var(--space-4);border:1px solid var(--border-hairline);border-radius:var(--radius-card);background:var(--surface-page)}.rating-stars{gap:.2rem;display:flex}.rating-star{min-width:var(--tap);min-height:var(--tap);color:var(--accent);cursor:pointer;background:0 0;border:0;font-size:1.4rem;line-height:1}.rating-word{margin:.4rem 0 var(--space-3);font-size:var(--text-small-size);color:var(--text-quiet);min-height:1.2rem}.rating-comment{border:1px solid var(--border-hairline);border-radius:var(--radius-card);width:100%;min-height:4.5rem;font-family:var(--font-ui);font-size:var(--text-ui-size);color:var(--text-body);background:var(--surface-page);resize:vertical;padding:.6rem .75rem}.rating-actions{justify-content:flex-end;gap:var(--space-2);margin-top:var(--space-3);display:flex}.rating-thanks{width:min(20rem,100vw - 2rem);padding:var(--space-4);text-align:center;border:1px solid var(--accent);border-radius:var(--radius-card);background:var(--surface-card-active);font-family:var(--font-ui);font-weight:var(--weight-ui)}.exercise-page .vg-form{margin-top:var(--space-7);max-width:20rem}.exercise-feedback{margin-top:var(--space-4);border-radius:var(--radius-card);font-family:var(--font-ui);flex-direction:column;align-items:flex-start;gap:.4rem;max-width:26rem;padding:1rem 1.1rem;display:flex}.exercise-feedback[hidden]{display:none}.exercise-feedback--correct{border:1px solid var(--accent);background:var(--surface-card-active)}.exercise-feedback--incorrect{border:1px solid var(--verdict-fail);background:var(--surface-card)}.exercise-feedback--incorrect strong{color:var(--verdict-fail)}