/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */
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minmax(0,1fr);align-items:start;display:grid}.rail-ranked-item:last-child{border-bottom:0}.rail-ranked-num{font-family:var(--oct-font-mono);font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--sem-content-subtle);line-height:1.5}.rail-ranked-title{font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content);transition:color var(--oct-duration-fast) var(--oct-ease);line-height:1.45}.rail-ranked-item:hover .rail-ranked-title{color:var(--sem-accent)}.rail-ranked-meta{margin-top:var(--oct-space-1);font-size:var(--oct-text-2xs);color:var(--sem-content-subtle)}.promo{border-radius:var(--sem-card-radius);border:1px solid var(--sem-card-border);background:var(--sem-card-bg);box-shadow:var(--sem-card-shadow);transition:border-color var(--oct-duration-normal) var(--oct-ease), transform var(--oct-duration-normal) var(--oct-ease);display:block;overflow:hidden}.promo:hover{border-color:var(--promo-hue)}@supports (color:color-mix(in lab, red, red)){.promo:hover{border-color:color-mix(in srgb, var(--promo-hue) 40%, transparent)}}.promo:hover{transform:translateY(-2px)}.promo-art{aspect-ratio:16/9;color:var(--promo-hue);opacity:var(--sem-art-opacity);background:linear-gradient(150deg, var(--promo-hue), transparent 70%), var(--sem-surface-inset);display:block}@supports (color:color-mix(in lab, red, red)){.promo-art{background:linear-gradient(150deg, color-mix(in srgb, var(--promo-hue) 20%, transparent), transparent 70%), var(--sem-surface-inset)}}.promo-art{border-bottom:1px solid var(--promo-hue)}@supports (color:color-mix(in lab, red, red)){.promo-art{border-bottom:1px solid color-mix(in srgb, var(--promo-hue) 22%, transparent)}}.promo-art svg{width:100%;height:100%}.promo-body-wrap{padding:var(--oct-space-4) var(--oct-space-5) var(--oct-space-5);display:block}.promo-kicker{font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--promo-hue);display:block}.promo-title{margin-top:var(--oct-space-2);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-lg);font-weight:var(--oct-weight-semibold);line-height:var(--oct-leading-snug);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading);text-wrap:balance;display:block}.promo-body{margin-top:var(--oct-space-2);font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content-muted);line-height:1.55;display:block}.promo-cta{align-items:center;gap:var(--oct-space-2);margin-top:var(--oct-space-4);font-size:var(--oct-text-xs);font-weight:var(--oct-weight-semibold);color:var(--promo-hue);display:inline-flex}.promo-cta svg{width:13px;height:13px;transition:transform var(--oct-duration-fast) var(--oct-ease)}.promo:hover .promo-cta svg{transform:translate(3px)}.series-box{margin-bottom:var(--oct-space-8);padding:var(--oct-space-4) var(--oct-space-5);border:1px solid var(--series-hue)}@supports (color:color-mix(in lab, red, red)){.series-box{border:1px solid color-mix(in srgb, var(--series-hue) 28%, transparent)}}.series-box{border-radius:var(--oct-radius-md);background:var(--series-hue);border-left-width:3px}@supports (color:color-mix(in lab, red, red)){.series-box{background:color-mix(in srgb, var(--series-hue) 7%, transparent)}}.series-box-head{align-items:baseline;gap:var(--oct-space-3);flex-wrap:wrap;justify-content:space-between;display:flex}.series-box-name{font-family:var(--oct-font-sans);font-size:var(--oct-text-xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--series-hue)}.series-box-count{font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--sem-content-muted)}.series-track{margin-top:var(--oct-space-3);gap:4px;display:flex}.series-tick{border-radius:var(--oct-radius-full);background:var(--series-hue);flex:1;height:4px}@supports (color:color-mix(in lab, red, red)){.series-tick{background:color-mix(in srgb, var(--series-hue) 16%, transparent)}}.series-tick.is-published{background:var(--series-hue)}@supports (color:color-mix(in lab, red, red)){.series-tick.is-published{background:color-mix(in srgb, var(--series-hue) 45%, transparent)}}.series-tick.is-here{background:var(--series-hue)}.series-tick a,.series-tick span{height:100%;display:block}.series-box-nav{gap:var(--oct-space-5);margin-top:var(--oct-space-4);justify-content:space-between;display:flex}.series-step{min-width:0;max-width:22ch;display:block}.series-step-next{text-align:right;margin-left:auto}.series-step-label{font-size:var(--oct-text-2xs);letter-spacing:var(--oct-tracking-wider);text-transform:uppercase;color:var(--sem-content-subtle);display:block}.series-step-title{font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content);margin-top:2px;line-height:1.35;display:block}.series-step:hover .series-step-title{color:var(--series-hue)}.series-header{padding-bottom:var(--oct-space-8);border-bottom:1px solid var(--sem-line)}.series-header-kicker{font-size:var(--oct-text-xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--series-hue)}.series-header-title{margin-top:var(--oct-space-3);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-feature);font-weight:var(--oct-weight-bold);line-height:var(--oct-leading-tight);letter-spacing:var(--oct-tracking-tighter);color:var(--sem-heading)}.series-header-blurb{margin-top:var(--oct-space-4);font-family:var(--oct-font-reading);font-size:var(--oct-text-lg);color:var(--sem-content-muted);max-width:var(--oct-measure-narrow);line-height:1.55}.series-header-meta{margin-top:var(--oct-space-5);font-size:var(--oct-text-sm);color:var(--sem-content-subtle)}.series-header-meta strong{color:var(--sem-content-strong);font-variant-numeric:tabular-nums}.series-part{gap:var(--oct-space-4);grid-template-columns:2.5rem minmax(0,1fr);align-items:start;display:grid}.series-part-num{padding-top:var(--oct-space-6);font-family:var(--oct-font-mono);font-size:var(--oct-text-sm);font-variant-numeric:tabular-nums;color:var(--series-hue)}.series-part-pending{opacity:.75}.series-pending-body{padding:var(--oct-space-6) 0;border-top:1px dashed var(--sem-line)}.series-pending-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-xl);color:var(--sem-content-muted)}.series-pending-note{margin-top:var(--oct-space-2);font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content-subtle);max-width:var(--oct-measure-narrow)}.series-pending-note a{color:var(--sem-accent);text-underline-offset:.18em;text-decoration:underline}@media (width<=40rem){.series-part{grid-template-columns:minmax(0,1fr);gap:0}.series-part-num{padding-top:var(--oct-space-6);padding-bottom:0}}.filters{gap:var(--oct-space-4);padding:var(--oct-space-6) 0;border-bottom:1px solid var(--sem-line-muted);top:var(--oct-header-h);z-index:var(--oct-z-raised);background:var(--sem-surface-glass);-webkit-backdrop-filter:blur(12px);flex-direction:column;display:flex;position:sticky}.filter-group{align-items:center;gap:var(--oct-space-2);flex-wrap:wrap;display:flex}.filter-label{min-width:4.5rem;font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--sem-content-subtle)}.filter{align-items:center;gap:var(--oct-space-2);padding:var(--oct-space-1) var(--oct-space-3);border:1px solid var(--sem-line);border-radius:var(--oct-radius-full);font-size:var(--oct-text-xs);font-weight:var(--oct-weight-medium);color:var(--sem-content-muted);transition:color var(--oct-duration-fast) var(--oct-ease), border-color var(--oct-duration-fast) var(--oct-ease), background-color var(--oct-duration-fast) var(--oct-ease);display:inline-flex}.filter:hover{color:var(--sem-content-strong);border-color:var(--sem-line-strong)}.filter.is-on{--on:var(--filter-hue,var(--sem-accent));color:var(--on);border-color:var(--on)}@supports (color:color-mix(in lab, red, red)){.filter.is-on{border-color:color-mix(in srgb, var(--on) 45%, transparent)}}.filter.is-on{background:var(--on)}@supports (color:color-mix(in lab, red, red)){.filter.is-on{background:color-mix(in srgb, var(--on) 12%, transparent)}}.filter-count{font-variant-numeric:tabular-nums;font-size:var(--oct-text-2xs);opacity:.7}.filter-empty{padding:var(--oct-space-16) 0;text-align:center;color:var(--sem-content-muted)}.filter-reset{margin-left:var(--oct-space-2);color:var(--sem-accent);text-underline-offset:.18em;font-size:inherit;text-decoration:underline}[data-item][hidden]{display:none}@media (width<=40rem){.filters{position:static}.filter-label{min-width:100%}}.wire-item{padding:var(--oct-space-3) 0;border-bottom:1px solid var(--sem-line-muted)}.wire-item:last-child{border-bottom:0}.wire-time{font-family:var(--oct-font-mono);font-size:var(--oct-text-2xs);font-variant-numeric:tabular-nums;letter-spacing:var(--oct-tracking-wide);color:var(--sem-content-subtle)}.wire-text{margin-top:var(--oct-space-1);font-size:var(--oct-text-sm);color:var(--sem-content);line-height:1.5}.wire-text strong{color:var(--sem-content-strong);font-weight:var(--oct-weight-semibold)}.rail-card{padding:var(--oct-space-5);background:var(--sem-card-bg);border:1px solid var(--sem-card-border);border-radius:var(--sem-card-radius);box-shadow:var(--sem-card-shadow);position:relative;overflow:hidden}.rail-card:before{content:"";background:var(--sem-gradient);opacity:.7;height:1px;position:absolute;inset:0 0 auto}.rail-card-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-lg);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading)}.rail-card-body{margin-top:var(--oct-space-2);font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content-muted);line-height:1.55}.field{width:100%;padding:var(--oct-space-2) var(--oct-space-3);background:var(--sem-surface);border:1px solid var(--sem-line);border-radius:var(--oct-radius-sm);font-size:var(--oct-text-sm);color:var(--sem-content-strong);transition:border-color var(--oct-duration-fast) var(--oct-ease)}.field::placeholder{color:var(--sem-content-subtle)}.field:focus{border-color:var(--sem-line-accent)}.article-header{padding-bottom:var(--oct-space-8);margin-bottom:var(--oct-space-8);border-bottom:1px solid var(--sem-line)}.article-title{margin-top:var(--oct-space-4);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-feature);font-weight:var(--oct-weight-bold);line-height:var(--oct-leading-tight);letter-spacing:var(--oct-tracking-tighter);color:var(--sem-heading);text-wrap:pretty}.article-byline{align-items:center;gap:var(--oct-space-2) var(--oct-space-4);margin-top:var(--oct-space-6);font-size:var(--oct-text-sm);color:var(--sem-content-muted);flex-wrap:wrap;display:flex}.article-byline strong{color:var(--sem-content-strong);font-weight:var(--oct-weight-medium)}.read-progress{transform-origin:0;width:100%;height:2px;transform:scaleX(var(--progress,0));background:var(--sem-accent);z-index:var(--oct-z-toast);pointer-events:none;position:fixed;top:0;left:0}.toc-link{padding:var(--oct-space-2) var(--oct-space-3);margin-left:calc(var(--oct-space-3) * -1);border-left:2px solid var(--sem-line-muted);font-size:var(--oct-text-sm);color:var(--sem-content-muted);transition:color var(--oct-duration-fast) var(--oct-ease), border-color var(--oct-duration-fast) var(--oct-ease);line-height:1.4;display:block}.toc-link:hover{color:var(--sem-content-strong)}.toc-link.is-active{color:var(--sem-accent);border-left-color:var(--sem-accent)}.toc-link-h3{padding-left:var(--oct-space-6);font-size:var(--oct-text-xs)}.section-rule{align-items:baseline;gap:var(--oct-space-4);margin:var(--oct-space-12) 0 var(--oct-space-2);display:flex}.section-rule:first-child{margin-top:0}.section-rule-title{font-family:var(--oct-font-sans);font-size:var(--oct-text-xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--sem-content-muted);white-space:nowrap}.section-rule:after{content:"";background:var(--sem-line);flex:1;height:1px}.section-rule-action{font-size:var(--oct-text-xs);color:var(--sem-accent);white-space:nowrap;order:3}.drawer-trigger{display:none}@media (width<=56.25rem){.drawer-trigger{display:inline-flex}}.drawer{z-index:var(--oct-z-dialog);display:none;position:fixed;inset:0}.drawer[open]{display:block}.drawer-scrim{background:var(--sem-scrim);border:0;width:100%;position:absolute;inset:0}.drawer-panel{width:min(20rem,82vw);padding:var(--oct-space-6);background:var(--sem-surface-overlay);border-right:1px solid var(--sem-line);box-shadow:var(--sem-shadow-dialog);animation:drawer-in var(--oct-duration-slow) var(--oct-ease-out);position:absolute;inset:0 auto 0 0;overflow-y:auto}@keyframes drawer-in{0%{transform:translate(-100%)}to{transform:none}}.scroll-x{max-width:100%;overflow-x:auto}.spec-row{align-items:baseline;gap:var(--oct-space-5);padding-bottom:var(--oct-space-3);border-bottom:1px solid var(--sem-line-muted);display:flex}.spec-row-meta{text-align:right;white-space:nowrap;min-width:7rem;font-size:var(--oct-text-xs);color:var(--sem-content-subtle)}.line-row{align-items:center;gap:var(--oct-space-4);display:flex}.line-row-rule{flex:1;min-width:2rem;height:1px}.line-row-token{min-width:12rem}.line-row-use{min-width:9rem;font-size:var(--oct-text-xs);color:var(--sem-content-subtle)}@media (width<=34rem){.spec-row{gap:var(--oct-space-2);flex-wrap:wrap}.spec-row-meta{text-align:left;min-width:0}.line-row{gap:var(--oct-space-2) var(--oct-space-3);flex-wrap:wrap}.line-row-rule{flex-basis:100%;order:-1}.line-row-token,.line-row-use{min-width:0}}.site-footer{border-top:1px solid var(--sem-line);margin-top:var(--oct-space-16)}.site-footer-inner{justify-content:space-between;align-items:center;gap:var(--oct-space-6);max-width:var(--oct-shell-max);padding:var(--oct-space-10) var(--oct-gutter);font-size:var(--oct-text-sm);color:var(--sem-content-muted);flex-wrap:wrap;margin:0 auto;display:flex}.footer-links{gap:var(--oct-space-5);flex-wrap:wrap;display:flex}.footer-links a:hover{color:var(--sem-accent)}.contact-row{gap:var(--oct-space-4);padding-bottom:var(--oct-space-5);border-bottom:1px solid var(--sem-line-muted);flex-wrap:wrap;justify-content:space-between;align-items:baseline;display:flex}.contact-what{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-lg);font-weight:var(--oct-weight-semibold);color:var(--sem-heading)}.contact-why{font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content-muted);margin-top:2px}.contact-where{font-family:var(--oct-font-mono);font-size:var(--oct-text-sm);color:var(--sem-accent);text-underline-offset:.2em;text-decoration:underline;-webkit-text-decoration-color:var(--sem-accent-muted);-webkit-text-decoration-color:var(--sem-accent-muted);text-decoration-color:var(--sem-accent-muted)}.contact-where:hover{-webkit-text-decoration-color:var(--sem-accent);-webkit-text-decoration-color:var(--sem-accent);text-decoration-color:var(--sem-accent)}.contact-form{align-items:flex-start;gap:var(--oct-space-4);max-width:var(--oct-measure-narrow);margin-top:var(--oct-space-6);flex-direction:column;display:flex}.contact-field{width:100%}.contact-field label{margin-bottom:var(--oct-space-2);font-size:var(--oct-text-xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-wider);text-transform:uppercase;color:var(--sem-content-subtle);display:block}.contact-field textarea{resize:vertical;font-family:var(--oct-font-sans)}.contact-note{font-size:var(--oct-text-xs);color:var(--sem-content-subtle)}.contact-optional{margin-left:var(--oct-space-2);font-weight:var(--oct-weight-normal);letter-spacing:0;text-transform:none;color:var(--sem-content-subtle)}.contact-hp{width:1px;height:1px;position:absolute;left:-9999px;overflow:hidden}.contact-turnstile{min-height:65px}.contact-actions{align-items:center;gap:var(--oct-space-4);margin-top:var(--oct-space-2);flex-wrap:wrap;display:flex}.contact-status{font-size:var(--oct-text-sm);color:var(--sem-content-muted)}.contact-status[data-kind=ok]{color:var(--sem-ok)}.contact-status[data-kind=error]{color:var(--sem-bad)}.subscribe-form{margin-top:var(--oct-space-4);gap:var(--oct-space-2);flex-direction:column;display:flex}.subscribe-status{font-size:var(--oct-text-sm);line-height:var(--oct-leading-snug);color:var(--sem-content-muted)}.subscribe-status:empty{display:none}.subscribe-status[data-kind=ok]{color:var(--sem-ok)}.subscribe-status[data-kind=error]{color:var(--sem-bad)}.series-next{padding:var(--oct-space-5);border:1px solid var(--sem-card-border);border-radius:var(--sem-card-radius);background:linear-gradient(150deg, var(--promo-hue), transparent 70%), var(--sem-card-bg)}@supports (color:color-mix(in lab, red, red)){.series-next{background:linear-gradient(150deg, color-mix(in srgb, var(--promo-hue) var(--sem-card-wash), transparent), transparent 70%), var(--sem-card-bg)}}.series-next{box-shadow:var(--sem-card-shadow)}.series-next-name{margin-top:var(--oct-space-2);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-lg);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading);display:block}.series-next-name:hover{color:var(--promo-hue)}.series-next-list{margin-top:var(--oct-space-4);flex-direction:column;display:flex}.series-next-item{gap:var(--oct-space-2) var(--oct-space-3);padding:var(--oct-space-3) 0;border-top:1px solid var(--sem-line-muted);grid-template-columns:1.5rem 2.5rem minmax(0,1fr);align-items:start;display:grid}.series-next-num{font-family:var(--oct-font-mono);font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--promo-hue);line-height:1.45}.series-next-title{font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content);line-height:1.45}.series-next-title:hover{color:var(--promo-hue)}.series-next-foot{margin-top:var(--oct-space-3);padding-top:var(--oct-space-3);border-top:1px solid var(--sem-line-muted);font-size:var(--oct-text-2xs);letter-spacing:var(--oct-tracking-wide);text-transform:uppercase;color:var(--sem-content-subtle)}.filter-rail-group+.filter-rail-group{margin-top:var(--oct-space-6)}.filter-rail-list{gap:var(--oct-space-2);flex-wrap:wrap;display:flex}.rail-thumb{border:1px solid var(--sem-card-border);border-radius:var(--oct-radius-md);background:linear-gradient(140deg, currentColor, transparent 70%), var(--sem-card-bg);flex:none;width:3rem;height:3rem;display:block}@supports (color:color-mix(in lab, red, red)){.rail-thumb{background:linear-gradient(140deg, color-mix(in srgb, currentColor var(--sem-card-wash), transparent), transparent 70%), var(--sem-card-bg)}}.rail-thumb{box-shadow:var(--sem-card-shadow);opacity:var(--sem-art-opacity);transition:border-color var(--oct-duration-fast) var(--oct-ease);overflow:hidden}.rail-thumb:hover{border-color:currentColor}@supports (color:color-mix(in lab, red, red)){.rail-thumb:hover{border-color:color-mix(in srgb, currentColor 55%, transparent)}}.rail-thumb-sm{width:2.5rem;height:2.5rem}.rail-thumb svg{width:100%;height:100%}.series-next{padding:0 0 var(--oct-space-5);overflow:hidden}.series-next>:not(.promo-art){margin-left:var(--oct-space-5);margin-right:var(--oct-space-5)}.series-next-kicker{margin-top:var(--oct-space-4);display:block}.rail-toggle{flex:none}@media (width<=56.25rem){.rail-toggle{display:none}}@media (width>=56.3125rem){html.rail-collapsed .shell{grid-template-columns:minmax(0, 1fr) var(--oct-rail-right)}html.rail-collapsed .shell-rail-left{display:none}}@media (width>=56.3125rem) and (width<=75rem){html.rail-collapsed .shell{grid-template-columns:minmax(0,1fr)}}.reader-controls{right:var(--oct-space-5);bottom:var(--oct-space-5);z-index:var(--oct-z-header);gap:var(--oct-space-1);padding:var(--oct-space-1);border:1px solid var(--sem-line);border-radius:var(--oct-radius-full);background:var(--sem-surface-glass);-webkit-backdrop-filter:blur(14px);box-shadow:var(--sem-shadow-overlay);display:flex;position:fixed}.reader-controls .btn-icon{border-radius:var(--oct-radius-full)}.reader-hint{right:0;bottom:calc(100% + var(--oct-space-2));padding:var(--oct-space-1) var(--oct-space-3);border-radius:var(--oct-radius-full);background:var(--sem-surface-overlay);border:1px solid var(--sem-line);font-size:var(--oct-text-2xs);color:var(--sem-content-muted);white-space:nowrap;opacity:0;transition:opacity var(--oct-duration-normal) var(--oct-ease);pointer-events:none;position:absolute}.reader-hint.is-shown{opacity:1}html.focus-mode .site-header,html.focus-mode .shell-rail-left,html.focus-mode .shell-rail-right,html.focus-mode .site-footer,html.focus-mode .vshell-nav,html.focus-mode .vshell-aside,html.focus-mode .vfoot,html.focus-mode .mobilenav,html.focus-mode .ambient{display:none}html.focus-mode .shell,html.focus-mode .vshell{max-width:none;padding-top:var(--oct-space-16);grid-template-columns:minmax(0,1fr)}html.focus-mode .vshell-main{border-inline:0;max-width:54rem;margin:0 auto;padding-inline:0}html.focus-mode .shell-stream{max-width:54rem;margin:0 auto}html.focus-mode .prose{font-size:1.3125rem;line-height:1.72}html.focus-mode .prose .lede{font-size:1.5rem}html.focus-mode .prose>h2{font-size:2.125rem}html.focus-mode .prose>h3{font-size:1.6875rem}html.focus-mode .prose .pull-quote{font-size:1.75rem}html.focus-mode .prose .code-block,html.focus-mode .prose table{font-size:1rem}html.focus-mode .article-title{max-width:none;font-size:clamp(2.5rem,1.7rem + 3.2vw,4.25rem)}html.focus-mode .article-header{padding-bottom:var(--oct-space-10)}html.focus-mode .read-progress{top:0}.site-header-inner{position:relative}.spotlight-trigger{align-items:center;gap:var(--oct-space-3);width:min(24rem,30vw);padding:var(--oct-space-2) var(--oct-space-3);border:1px solid var(--sem-card-border);border-radius:var(--oct-radius-md);background:var(--sem-card-bg);box-shadow:var(--sem-card-shadow);color:var(--sem-content-subtle);font-size:var(--oct-text-sm);text-align:left;transition:border-color var(--oct-duration-fast) var(--oct-ease), color var(--oct-duration-fast) var(--oct-ease);display:flex;position:absolute;left:50%;transform:translate(-50%)}.spotlight-trigger:hover{border-color:var(--sem-line-accent);color:var(--sem-content)}.spotlight-trigger svg{flex:none;width:14px;height:14px}.spotlight-trigger-label{flex:1}.spotlight-kbd{font-family:var(--oct-font-mono);font-size:var(--oct-text-2xs);border:1px solid var(--sem-line);border-radius:var(--oct-radius-xs);color:var(--sem-content-subtle);background:0 0;padding:.05rem .3rem;line-height:1.5}.spotlight-trigger-sm{display:none}@media (width<=56.25rem){.spotlight-trigger{display:none}.spotlight-trigger-sm{display:inline-flex}}.spotlight{z-index:var(--oct-z-dialog);padding:12vh var(--oct-gutter) var(--oct-gutter);place-items:start center;display:grid;position:fixed;inset:0}.spotlight[hidden]{display:none}.spotlight-scrim{background:var(--sem-scrim);-webkit-backdrop-filter:blur(2px);border:0;width:100%;position:absolute;inset:0}.spotlight-panel{border:1px solid var(--sem-card-border);border-radius:var(--sem-card-radius);background:var(--sem-surface-overlay);width:min(38rem,100%);max-height:70vh;box-shadow:var(--sem-shadow-dialog);animation:spotlight-in var(--oct-duration-slow) var(--oct-ease-out);flex-direction:column;display:flex;position:relative;overflow:hidden}.spotlight-panel:before{content:"";background:var(--sem-gradient);opacity:.8;z-index:1;height:1px;position:absolute;inset:0 0 auto}@keyframes spotlight-in{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}.spotlight-field{align-items:center;gap:var(--oct-space-3);padding:var(--oct-space-4) var(--oct-space-5);border-bottom:1px solid var(--sem-line);display:flex}.spotlight-field svg{width:16px;height:16px;color:var(--sem-content-subtle);flex:none}.spotlight-field input{min-width:0;font-family:var(--oct-font-sans);font-size:var(--oct-text-lg);color:var(--sem-content-strong);background:0 0;border:0;outline:none;flex:1}.spotlight-field input::placeholder{color:var(--sem-content-subtle)}.spotlight-results{overflow-y:auto}.spotlight-item{align-items:baseline;gap:var(--oct-space-4);padding:var(--oct-space-3) var(--oct-space-5);border-bottom:1px solid var(--sem-line-muted);cursor:pointer;transition:background-color var(--oct-duration-fast) var(--oct-ease);grid-template-columns:minmax(0,1fr) auto;display:grid;box-shadow:inset 2px 0 #0000}.spotlight-item:last-child{border-bottom:0}.spotlight-item.is-active{background:var(--sem-accent-wash);box-shadow:inset 2px 0 0 var(--sem-accent)}.spotlight-item-title{font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content-strong);line-height:1.35}.spotlight-item-sub{font-size:var(--oct-text-xs);color:var(--sem-content-subtle);text-overflow:ellipsis;white-space:nowrap;margin-top:2px;display:block;overflow:hidden}.spotlight-item mark{color:var(--sem-accent);font-weight:var(--oct-weight-semibold);background:0 0}.spotlight-item-kind{font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;white-space:nowrap}.spotlight-empty{padding:var(--oct-space-10) var(--oct-space-5);text-align:center;color:var(--sem-content-muted);font-family:var(--oct-font-reading);font-size:var(--oct-text-base)}.spotlight-foot{gap:var(--oct-space-5);padding:var(--oct-space-3) var(--oct-space-5);border-top:1px solid var(--sem-line);background:var(--sem-surface-raised);font-size:var(--oct-text-2xs);letter-spacing:var(--oct-tracking-wide);color:var(--sem-content-subtle);flex-wrap:wrap;display:flex}.spotlight-foot span{align-items:center;gap:var(--oct-space-2);display:inline-flex}@media (width<=40rem){.spotlight-foot{display:none}}.vshell{grid-template-columns:var(--oct-nav-w) minmax(0, var(--oct-main-w)) var(--oct-aside-w);gap:var(--oct-space-6);max-width:var(--oct-vshell-max);padding:0 var(--oct-gutter);align-items:start;margin:0 auto;display:grid}.vshell-nav,.vshell-aside{overscroll-behavior:contain;scrollbar-width:none;height:100vh;padding:var(--oct-space-6) 0;position:sticky;top:0;overflow-y:auto}.vshell-nav::-webkit-scrollbar{display:none}.vshell-aside::-webkit-scrollbar{display:none}.vshell-main{min-width:0;padding:var(--oct-space-8) 0 var(--oct-space-24);background:var(--sem-reading-ground);border-inline:1px solid var(--sem-line-muted);min-height:100vh;padding-inline:var(--oct-space-7)}.navrail{gap:var(--oct-space-2);min-height:calc(100vh - var(--oct-space-12));flex-direction:column;display:flex}.navrail-logo{padding:var(--sem-mark-plate-pad);background:var(--sem-mark-plate);border-radius:var(--sem-mark-plate-radius);margin-left:calc(var(--oct-space-4) + 1px - var(--sem-mark-plate-pad));margin-bottom:var(--oct-space-5);align-self:flex-start;display:inline-flex}.navrail-list{flex-direction:column;gap:2px;display:flex}.navrail-list-tight{gap:0}.navrow{align-items:center;gap:var(--oct-space-4);padding:var(--oct-space-3) var(--oct-space-4);border-radius:var(--oct-radius-full);font-size:var(--oct-text-lg);color:var(--sem-content);white-space:nowrap;transition:background-color var(--oct-duration-fast) var(--oct-ease), color var(--oct-duration-fast) var(--oct-ease);display:flex}.navrow:hover{background:var(--sem-surface-hover);color:var(--sem-content-strong)}.navrow[aria-current=page]{color:var(--sem-content-strong);font-weight:var(--oct-weight-semibold)}.navrow-icon{flex:none;place-items:center;width:24px;height:24px;display:grid}.navrow-icon svg{width:22px;height:22px}.navrow[aria-current=page] .navrow-icon{color:var(--sem-accent)}.navrow-sm{padding:var(--oct-space-2) var(--oct-space-4);font-size:var(--oct-text-sm);color:var(--sem-content-muted)}.navrow-dot{border-radius:var(--oct-radius-full);background:var(--chip-hue,var(--sem-content-subtle));flex:none;width:.4rem;height:.4rem;margin-left:.55rem;margin-right:.55rem}.navrow-soon{color:var(--sem-content-subtle);cursor:default}.navrow-soon:hover{color:var(--sem-content-subtle);background:0 0}.navrow-tag{font-size:var(--oct-text-2xs);letter-spacing:var(--oct-tracking-wider);text-transform:uppercase;color:var(--sem-content-subtle);border:1px solid var(--sem-line);border-radius:var(--oct-radius-full);margin-left:auto;padding:.05rem .45rem}.navrail-group{margin-top:var(--oct-space-5)}.navrail-heading{padding:0 var(--oct-space-4);margin-bottom:var(--oct-space-2);font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--sem-content-subtle)}.navrail-sep{border:0;border-top:1px solid var(--sem-line-muted);height:0;margin:var(--oct-space-3) var(--oct-space-4)}.navrail-tail{margin-top:auto}.navrail-foot{margin-top:2px}.vshell-aside .shell-rail-right{position:static;top:auto;bottom:auto}.vsearch{width:100%;margin-bottom:var(--oct-space-6);position:static;transform:none}.vfoot{margin-top:var(--oct-space-16);padding-top:var(--oct-space-6);border-top:1px solid var(--sem-line-muted);font-size:var(--oct-text-sm);color:var(--sem-content-subtle)}.vfoot-bottom{justify-content:space-between;align-items:center;gap:var(--oct-space-5);margin-top:var(--oct-space-5);flex-wrap:wrap;display:flex}.vfoot-legal{font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--sem-content-subtle)}.site-footer-inner>.vfoot-legal{margin-top:var(--oct-space-3)}.stream-lead-figure svg,.stream-figure svg,.article-art svg,.rail-thumb svg,.promo-art svg,.cover-art svg,.course-art svg,.course-hero-art svg,.series-row-art svg{stroke-width:var(--sem-art-stroke)}.math-block{margin:var(--oct-space-8) 0}.math-scroll{padding:var(--oct-space-2) 0;overflow:auto hidden}.math-block figcaption{margin-top:var(--oct-space-3);font-size:var(--oct-text-sm);color:var(--sem-content-subtle);text-align:center}.prose .katex{font-size:1.08em}.prose .katex-display{margin:0}.prose p .katex{font-size:1.02em}.reflist{gap:var(--oct-space-4);margin-top:var(--oct-space-5);counter-reset:ref;max-width:var(--oct-measure-narrow);flex-direction:column;display:flex}.ref{padding-left:var(--oct-space-8);counter-increment:ref;font-size:var(--oct-text-sm);line-height:1.5;position:relative}.ref:before{content:"[" counter(ref) "]";font-family:var(--oct-font-mono);font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--sem-content-subtle);position:absolute;top:0;left:0}.ref-author{color:var(--sem-content-muted)}.ref-author:after{content:". "}.ref-title{font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content-strong)}a.ref-title{color:var(--sem-accent)}a.ref-title:hover{color:var(--sem-accent-hover);text-underline-offset:2px;text-decoration:underline}.ref-meta:before{content:" · ";color:var(--sem-content-subtle)}.ref-meta{color:var(--sem-content-muted);font-variant-numeric:tabular-nums}.ref-note{color:var(--sem-content-subtle);margin-top:2px;display:block}.cite{font-family:var(--oct-font-mono);font-variant-numeric:tabular-nums;color:var(--sem-content-subtle);vertical-align:.28em;padding-inline:1px;font-size:.78em}.cite:hover{color:var(--sem-accent)}.brand-list{margin-top:var(--oct-space-10);flex-direction:column;display:flex}.brand{gap:var(--oct-space-8);padding:var(--oct-space-8) 0;border-bottom:1px solid var(--sem-line-muted);grid-template-columns:8.5rem minmax(0,1fr);align-items:start;display:grid}.brand:first-child{padding-top:0}.brand:last-child{border-bottom:0}.brand-mark{aspect-ratio:1;border-radius:var(--sem-card-radius);border:1px solid var(--sem-card-border);box-shadow:var(--sem-card-shadow);background:var(--sem-surface-inset);place-items:center;display:grid;overflow:hidden}.brand-mark img{object-fit:cover;width:100%;height:100%}.brand-domain{font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--sem-content-subtle)}.brand-name{margin-top:var(--oct-space-2);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-2xl);font-weight:var(--oct-weight-bold);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading);line-height:1.15}.brand-desc{max-width:var(--oct-measure-narrow);margin-top:var(--oct-space-3);font-family:var(--oct-font-reading);font-size:var(--oct-text-lg);line-height:var(--oct-leading-loose);color:var(--sem-content)}.brand-products{gap:var(--oct-space-3);margin-top:var(--oct-space-6);flex-direction:column;display:flex}.brand-products>li{padding-left:var(--oct-space-5);border-left:2px solid var(--sem-line);gap:2px;display:grid}.brand-product-name{font-weight:var(--oct-weight-semibold);color:var(--sem-content-strong)}.brand-product-tagline{font-family:var(--oct-font-reading);color:var(--sem-content-muted)}.brand-product-meta{font-size:var(--oct-text-xs);letter-spacing:var(--oct-tracking-wide);text-transform:uppercase;color:var(--sem-content-subtle)}.brand-cta{align-items:center;gap:var(--oct-space-2);margin-top:var(--oct-space-6);font-size:var(--oct-text-base);color:var(--sem-accent);display:inline-flex}.brand-cta:hover{color:var(--sem-accent-hover)}.brand-cta svg{width:16px;height:16px;transition:transform var(--oct-duration-fast) var(--oct-ease)}.brand-cta:hover svg{transform:translate(3px)}@media (width<=48rem){.brand{gap:var(--oct-space-5);grid-template-columns:4.5rem minmax(0,1fr)}}.social-org{gap:var(--oct-space-1);display:flex}.social-org-link{border-radius:var(--oct-radius-full);width:34px;height:34px;color:var(--sem-content-subtle);transition:color var(--oct-duration-fast) var(--oct-ease), background-color var(--oct-duration-fast) var(--oct-ease);place-items:center;display:grid}.social-org-link:hover{color:var(--sem-accent);background:var(--sem-surface-hover)}.social-org-link svg{width:17px;height:17px}@media (width>=75.0625rem){html.rail-collapsed .vshell{grid-template-columns:var(--oct-nav-w-min) minmax(0, var(--oct-main-w)) var(--oct-aside-w)}html.rail-collapsed .vshell-nav .navrow-label,html.rail-collapsed .vshell-nav .navrow-tag,html.rail-collapsed .vshell-nav .navrail-heading{display:none}html.rail-collapsed .vshell-nav .navrow{padding-inline:var(--oct-space-2);justify-content:center}html.rail-collapsed .vshell-nav .navrow-dot{margin-inline:0}}@media (width<=78rem){.vshell{grid-template-columns:var(--oct-nav-w) minmax(0, 1fr)}.vshell-aside{display:none}}@media (width<=64rem){.vshell{grid-template-columns:var(--oct-nav-w-min) minmax(0, 1fr);gap:var(--oct-space-6)}.vshell-nav .navrow-label,.vshell-nav .navrow-tag,.vshell-nav .navrail-heading{display:none}.vshell-nav .navrow{padding-inline:var(--oct-space-2);justify-content:center}.vshell-nav .navrow-dot{margin-inline:0}}@media (width<=48rem){.vshell{padding:0 var(--oct-gutter);grid-template-columns:minmax(0,1fr)}.vshell-nav{display:none}.vshell-main{padding-inline:0;padding-top:var(--oct-space-6);padding-bottom:calc(var(--oct-space-24) + 3.5rem);border-inline:0}}.mobilenav{z-index:var(--oct-z-header);padding:var(--oct-space-2) var(--oct-space-2) calc(var(--oct-space-2) + env(safe-area-inset-bottom,0px));background:var(--sem-surface-glass);-webkit-backdrop-filter:blur(14px)saturate(140%);border-top:1px solid var(--sem-line-muted);display:none;position:fixed;inset:auto 0 0}@media (width<=48rem){.mobilenav{grid-auto-columns:1fr;grid-auto-flow:column;display:grid}}.mobiletab{padding:var(--oct-space-2) 0;border-radius:var(--oct-radius-md);font-size:var(--oct-text-2xs);color:var(--sem-content-muted);justify-items:center;gap:3px;display:grid}.mobiletab svg{width:22px;height:22px}.mobiletab[aria-current=page]{color:var(--sem-accent)}.navrail-drawer{min-height:0}.drawer-head{justify-content:space-between;align-items:center;gap:var(--oct-space-4);padding-bottom:var(--oct-space-5);margin-bottom:var(--oct-space-4);border-bottom:1px solid var(--sem-line-muted);display:flex}.drawer-brand{padding:var(--sem-mark-plate-pad);background:var(--sem-mark-plate);border-radius:var(--sem-mark-plate-radius);display:inline-flex}.drawer-close{width:40px;height:40px;margin-right:calc(var(--oct-space-2) * -1);border-radius:var(--oct-radius-full);color:var(--sem-content-muted);transition:background-color var(--oct-duration-fast) var(--oct-ease), color var(--oct-duration-fast) var(--oct-ease);justify-content:center;align-items:center;display:inline-flex}.drawer-close:hover{background:var(--sem-surface-hover);color:var(--sem-content-strong)}.drawer-close svg{width:22px;height:22px}.topic-grid{gap:var(--oct-space-2);margin-top:var(--oct-space-6);flex-wrap:wrap;display:flex}.topic-chip{align-items:center;gap:var(--oct-space-3);padding:var(--oct-space-2) var(--oct-space-4);border:1px solid var(--sem-card-border);border-radius:var(--oct-radius-full);background:var(--sem-card-bg);box-shadow:var(--sem-card-shadow);font-size:var(--oct-text-sm);color:var(--sem-content);transition:border-color var(--oct-duration-fast) var(--oct-ease);display:inline-flex}.topic-chip:hover{border-color:var(--chip-hue)}@supports (color:color-mix(in lab, red, red)){.topic-chip:hover{border-color:color-mix(in srgb, var(--chip-hue) 45%, transparent)}}.topic-chip:hover{color:var(--sem-content-strong)}.topic-chip-count{font-family:var(--oct-font-mono);font-size:var(--oct-text-2xs);font-variant-numeric:tabular-nums;color:var(--chip-hue)}.filter-panel{margin-bottom:var(--oct-space-8)}.shop-head{padding-bottom:var(--oct-space-6);border-bottom:1px solid var(--sem-line)}.shop-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-feature);font-weight:var(--oct-weight-bold);letter-spacing:var(--oct-tracking-tighter);color:var(--sem-heading)}.shop-lede{margin-top:var(--oct-space-3);font-family:var(--oct-font-reading);font-size:var(--oct-text-lg);color:var(--sem-content-muted);max-width:var(--oct-measure-narrow);line-height:1.55}.cover{aspect-ratio:3/4;border-radius:var(--oct-radius-sm);background:linear-gradient(160deg, var(--cover-hue), transparent 62%), var(--sem-surface-inset);position:relative;overflow:hidden;container-type:inline-size}@supports (color:color-mix(in lab, red, red)){.cover{background:linear-gradient(160deg, color-mix(in srgb, var(--cover-hue) 26%, transparent), transparent 62%), var(--sem-surface-inset)}}.cover{border:1px solid var(--sem-card-border);box-shadow:var(--sem-card-shadow);flex-direction:column;justify-content:flex-end;display:flex}.cover-photo{aspect-ratio:825/1018;background:var(--sem-surface-inset);display:block}.cover-photo img{object-fit:cover;width:100%;height:100%;display:block}.cover-art{color:var(--cover-hue);opacity:.5;position:absolute;inset:0}.cover-art svg{width:100%;height:100%}.cover-spine{background:var(--cover-hue);width:1px;position:absolute;inset:0 auto 0 7%}@supports (color:color-mix(in lab, red, red)){.cover-spine{background:color-mix(in srgb, var(--cover-hue) 40%, transparent)}}.cover-type{border-top:1px solid var(--cover-hue);flex-direction:column;gap:.25em;padding:8% 10% 11% 12%;display:flex;position:relative}@supports (color:color-mix(in lab, red, red)){.cover-type{border-top:1px solid color-mix(in srgb, var(--cover-hue) 30%, transparent)}}.cover-type{background:linear-gradient(to top, var(--sem-surface-inset) 70%, transparent)}@supports (color:color-mix(in lab, red, red)){.cover-type{background:linear-gradient(to top, color-mix(in srgb, var(--sem-surface-inset) 92%, transparent) 70%, transparent)}}.cover-imprint{letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--cover-hue);font-size:3.8cqw}.cover-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:8cqw;font-weight:var(--oct-weight-bold);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading);text-wrap:balance;line-height:1.1}.cover-sub{font-family:var(--oct-font-reading);color:var(--sem-content-muted);font-size:5.2cqw;line-height:1.3}@container (width<=100px){.cover-type{display:none}}.book-grid{gap:var(--oct-space-8) var(--oct-space-6);margin-top:var(--oct-space-8);grid-template-columns:repeat(auto-fill,minmax(190px,1fr));display:grid}.book-grid-sm{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.book-card{display:block}.book-card .cover{transition:transform var(--oct-duration-normal) var(--oct-ease)}.book-card:hover .cover{transform:translateY(-3px)}.book-card-body{margin-top:var(--oct-space-3)}.book-card-kind{font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase}.book-card-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-base);font-weight:var(--oct-weight-semibold);color:var(--sem-heading);margin-top:2px;line-height:1.25}.book-card-sub{font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content-muted);line-height:1.4}.book-card-price{margin-top:var(--oct-space-2);font-size:var(--oct-text-sm);color:var(--sem-content-muted);font-variant-numeric:tabular-nums}.book-card-price strong{color:var(--sem-content-strong)}.book-card-meta{color:var(--sem-content-subtle)}.book-hero{gap:var(--oct-space-8);padding-bottom:var(--oct-space-8);border-bottom:1px solid var(--sem-line);grid-template-columns:210px minmax(0,1fr);align-items:start;display:grid}.book-kind{font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase}.book-title{margin-top:var(--oct-space-2);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-3xl);font-weight:var(--oct-weight-bold);line-height:var(--oct-leading-tight);letter-spacing:var(--oct-tracking-tighter);color:var(--sem-heading)}.book-subtitle{margin-top:var(--oct-space-1);font-family:var(--oct-font-reading);font-size:var(--oct-text-lg);color:var(--sem-content-muted)}.book-pitch{margin-top:var(--oct-space-5);font-family:var(--oct-font-reading);font-size:var(--oct-text-md);line-height:var(--oct-leading-prose);color:var(--sem-content);max-width:var(--oct-measure)}.book-facts{gap:var(--oct-space-6);margin-top:var(--oct-space-6);flex-wrap:wrap;display:flex}.book-facts dt{font-size:var(--oct-text-2xs);letter-spacing:var(--oct-tracking-wider);text-transform:uppercase;color:var(--sem-content-subtle)}.book-facts dd{font-size:var(--oct-text-sm);color:var(--sem-content-strong);font-variant-numeric:tabular-nums;margin:2px 0 0}.book-about{margin-top:var(--oct-space-10);font-family:var(--oct-font-reading);font-size:var(--oct-text-md);line-height:var(--oct-leading-prose);color:var(--sem-content);max-width:var(--oct-measure)}.book-about p+p{margin-top:var(--oct-prose-para)}.book-contents{margin-top:var(--oct-space-4);max-width:var(--oct-measure)}.book-contents li{gap:var(--oct-space-3);padding:var(--oct-space-3) 0;border-bottom:1px solid var(--sem-line-muted);font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content);grid-template-columns:2rem minmax(0,1fr);display:grid}.book-contents-num{font-family:var(--oct-font-mono);font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--sem-content-subtle);line-height:1.7}.buybox{padding:var(--oct-space-5);border:1px solid var(--cover-hue)}@supports (color:color-mix(in lab, red, red)){.buybox{border:1px solid color-mix(in srgb, var(--cover-hue) 30%, var(--sem-card-border))}}.buybox{border-radius:var(--sem-card-radius);background:var(--sem-card-bg);box-shadow:var(--sem-card-shadow)}.buybox-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-lg);font-weight:var(--oct-weight-semibold);color:var(--sem-heading)}.buybox-formats{margin-top:var(--oct-space-3);flex-direction:column;display:flex}.buybox-format{align-items:center;gap:var(--oct-space-3);padding:var(--oct-space-3) 0;border-bottom:1px solid var(--sem-line-muted);font-size:var(--oct-text-sm);color:var(--sem-content);cursor:pointer;grid-template-columns:auto minmax(0,1fr) auto;display:grid}.buybox-formats li:last-child .buybox-format{border-bottom:0}.buybox-format input{accent-color:var(--sem-accent)}.buybox-format-name{align-items:center;gap:var(--oct-space-2);display:flex}.buybox-price{font-variant-numeric:tabular-nums;color:var(--sem-content-strong);font-weight:var(--oct-weight-medium)}.buybox-tag{font-size:var(--oct-text-2xs);letter-spacing:var(--oct-tracking-wide);text-transform:uppercase;color:var(--cover-hue);border-radius:var(--oct-radius-full);border:1px solid;padding:0 .4rem}.buybox-cta{width:100%;margin-top:var(--oct-space-4);padding-block:var(--oct-space-3)}.buybox-note{margin-top:var(--oct-space-3);font-size:var(--oct-text-2xs);color:var(--sem-content-subtle);line-height:1.5}.ship-list{gap:var(--oct-space-2);font-size:var(--oct-text-sm);color:var(--sem-content-muted);flex-direction:column;display:flex}.ship-list li{padding-left:var(--oct-space-4);position:relative}.ship-list li:before{content:"";background:var(--sem-line-strong);width:.5rem;height:1px;position:absolute;top:.68em;left:0}@media (width<=48rem){.book-hero{gap:var(--oct-space-6);grid-template-columns:minmax(0,1fr)}.book-hero .cover{max-width:190px}}.book>section+section{margin-top:var(--oct-space-12)}.rail-card+.rail-block,.buybox+.rail-block{margin-top:var(--oct-space-8)}.navrow-count{border-radius:var(--oct-radius-full);background:var(--sem-accent);min-width:1.35rem;color:var(--sem-accent-contrast);font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);font-variant-numeric:tabular-nums;text-align:center;margin-left:auto;padding:0 .35rem;line-height:1.35rem}.basket-empty{padding:var(--oct-space-16) 0;font-family:var(--oct-font-reading);font-size:var(--oct-text-lg);color:var(--sem-content-muted)}.basket-empty a{color:var(--sem-accent);text-underline-offset:.18em;text-decoration:underline}.basket-lines{margin-top:var(--oct-space-6)}.basket-line{align-items:center;gap:var(--oct-space-5);padding:var(--oct-space-5) 0;border-bottom:1px solid var(--sem-line-muted);grid-template-columns:minmax(0,1fr) auto auto auto;display:grid}.basket-line-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-lg);font-weight:var(--oct-weight-semibold);color:var(--sem-heading)}.basket-line-sub{font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content-muted)}.basket-line-fmt{font-size:var(--oct-text-xs);letter-spacing:var(--oct-tracking-wide);text-transform:uppercase;color:var(--sem-content-subtle);margin-top:2px}.basket-qty{align-items:center;gap:var(--oct-space-3);border:1px solid var(--sem-line);border-radius:var(--oct-radius-full);padding:.15rem var(--oct-space-3);font-variant-numeric:tabular-nums;display:inline-flex}.basket-qty button{color:var(--sem-content-muted);font-size:var(--oct-text-base);padding:.15rem;line-height:1}.basket-qty button:hover{color:var(--sem-accent)}.basket-line-price{font-variant-numeric:tabular-nums;color:var(--sem-content-strong);font-weight:var(--oct-weight-medium);text-align:right;min-width:4rem}.basket-remove{font-size:var(--oct-text-xs);color:var(--sem-content-subtle);text-underline-offset:.18em;text-decoration:underline}.basket-remove:hover{color:var(--sem-bad)}.basket-totals{margin-top:var(--oct-space-3)}.basket-totals>div{justify-content:space-between;gap:var(--oct-space-4);padding:var(--oct-space-2) 0;border-bottom:1px solid var(--sem-line-muted);font-size:var(--oct-text-sm);display:flex}.basket-totals dt{color:var(--sem-content-muted)}.basket-totals dd{color:var(--sem-content-strong);font-variant-numeric:tabular-nums;margin:0}@media (width<=48rem){.basket-line{row-gap:var(--oct-space-3);grid-template-columns:minmax(0,1fr) auto}.basket-line-price{text-align:left}}.course-list{margin-top:var(--oct-space-6);flex-direction:column;display:flex}.course-row{gap:var(--oct-space-6);padding:var(--oct-space-6) 0;border-bottom:1px solid var(--sem-line-muted);grid-template-columns:15rem minmax(0,1fr);display:grid}.course-art{aspect-ratio:16/9;border-radius:var(--sem-card-radius);border:1px solid var(--sem-card-border);box-shadow:var(--sem-card-shadow);color:var(--course-hue);background:linear-gradient(150deg, var(--course-hue), transparent 65%), var(--sem-card-bg);display:block;position:relative;overflow:hidden}@supports (color:color-mix(in lab, red, red)){.course-art{background:linear-gradient(150deg, color-mix(in srgb, var(--course-hue) 16%, transparent), transparent 65%), var(--sem-card-bg)}}.course-art svg{opacity:.75;width:100%;height:100%}.course-play{color:var(--course-hue);place-items:center;display:grid;position:absolute;inset:0}.course-play svg{opacity:.9;filter:drop-shadow(0 2px 8px #00000059);width:2.6rem;height:2.6rem}.course-kind{font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase}.course-title{margin-top:var(--oct-space-2);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-xl);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading);line-height:var(--oct-leading-snug)}.course-title a:hover{color:var(--course-hue)}.course-sub{margin-top:var(--oct-space-1);font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content-muted)}.course-meta{margin-top:var(--oct-space-3);font-size:var(--oct-text-sm);color:var(--sem-content-subtle);font-variant-numeric:tabular-nums}.course-meta strong{color:var(--sem-content-strong)}.course-hero{padding-bottom:var(--oct-space-8);border-bottom:1px solid var(--sem-line)}.course-hero-art{aspect-ratio:16/7;border-radius:var(--sem-card-radius);border:1px solid var(--sem-card-border);box-shadow:var(--sem-card-shadow);margin-bottom:var(--oct-space-6);color:var(--course-hue);background:linear-gradient(150deg, var(--course-hue), transparent 65%), var(--sem-card-bg);overflow:hidden}@supports (color:color-mix(in lab, red, red)){.course-hero-art{background:linear-gradient(150deg, color-mix(in srgb, var(--course-hue) 16%, transparent), transparent 65%), var(--sem-card-bg)}}.course-hero-art svg{width:100%;height:100%}.course-h1{margin-top:var(--oct-space-2);font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-feature);font-weight:var(--oct-weight-bold);line-height:var(--oct-leading-tight);letter-spacing:var(--oct-tracking-tighter);color:var(--sem-heading)}.course-hero-sub{margin-top:var(--oct-space-2);font-family:var(--oct-font-reading);font-size:var(--oct-text-lg);color:var(--sem-content-muted)}.course-pitch{margin-top:var(--oct-space-5);font-family:var(--oct-font-reading);font-size:var(--oct-text-md);line-height:var(--oct-leading-prose);color:var(--sem-content);max-width:var(--oct-measure)}.course-about{margin-top:var(--oct-space-10);font-family:var(--oct-font-reading);font-size:var(--oct-text-md);line-height:var(--oct-leading-prose);color:var(--sem-content);max-width:var(--oct-measure)}.course-about p+p{margin-top:var(--oct-prose-para)}.course>section+section{margin-top:var(--oct-space-12)}.progress{margin:var(--oct-space-4) 0}.progress-head{justify-content:space-between;align-items:baseline;gap:var(--oct-space-4);margin-bottom:var(--oct-space-2);display:flex}.progress-label{font-size:var(--oct-text-xs);letter-spacing:var(--oct-tracking-wide);color:var(--sem-content-subtle);font-variant-numeric:tabular-nums}.progress-reset{font-size:var(--oct-text-2xs);color:var(--sem-content-subtle);text-underline-offset:.18em;text-decoration:underline}.progress-reset:hover{color:var(--sem-bad)}.progress-track{border-radius:var(--oct-radius-full);background:var(--sem-line-muted);height:3px;overflow:hidden}.progress-fill{border-radius:inherit;background:var(--sem-accent);transform-origin:0;height:100%;transform:scaleX(var(--pct,0));transition:transform var(--oct-duration-normal) var(--oct-ease-out)}.about-intro{gap:var(--oct-space-8);margin-top:var(--oct-space-10);grid-template-columns:11rem minmax(0,1fr);align-items:start;display:grid}.about-portrait{margin:0}.about-portrait img{aspect-ratio:3/4;object-fit:cover;border-radius:var(--sem-card-radius);border:1px solid var(--sem-card-border);width:100%;box-shadow:var(--sem-card-shadow);background:var(--sem-surface-inset);display:block}.about-name{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-2xl);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading);line-height:1.15}.about-role{margin-top:var(--oct-space-2);font-size:var(--oct-text-xs);letter-spacing:var(--oct-tracking-wide);text-transform:uppercase;color:var(--sem-content-subtle)}.about-prose{max-width:var(--oct-measure-narrow);margin-top:var(--oct-space-6);font-family:var(--oct-font-reading);font-size:var(--oct-text-lg);line-height:var(--oct-leading-loose);color:var(--sem-content)}.about-social{margin-top:var(--oct-space-7)}@media (width<=48rem){.about-intro{gap:var(--oct-space-5);grid-template-columns:8rem minmax(0,1fr)}.about-prose{margin-top:var(--oct-space-6);grid-column:1/-1}}.social-row{gap:var(--oct-space-2);flex-wrap:wrap;display:flex}.social-link{align-items:center;gap:var(--oct-space-3);height:40px;padding-inline:var(--oct-space-4);border-radius:var(--oct-radius-full);border:1px solid var(--sem-line);font-size:var(--oct-text-sm);color:var(--sem-content-muted);transition:color var(--oct-duration-fast) var(--oct-ease), border-color var(--oct-duration-fast) var(--oct-ease), background-color var(--oct-duration-fast) var(--oct-ease);display:inline-flex}.social-link:hover{color:var(--sem-accent);border-color:var(--sem-accent);background:var(--sem-accent-wash)}.social-link svg{width:18px;height:18px}.track>.section-rule:first-child{margin-top:var(--oct-space-12)}.section-rule-track .section-rule-title{color:var(--track-hue)}.section-rule-track:before{content:"";border-radius:var(--oct-radius-full);background:var(--track-hue);flex:none;align-self:center;width:9px;height:9px}.section-rule-track:after{background:linear-gradient(to right, var(--track-hue), var(--sem-line) 12rem)}@supports (color:color-mix(in lab, red, red)){.section-rule-track:after{background:linear-gradient(to right, color-mix(in srgb, var(--track-hue) 45%, transparent), var(--sem-line) 12rem)}}.track-blurb{margin-top:var(--oct-space-3);font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content-muted)}.track-title{align-items:center;gap:var(--oct-space-4);display:flex}.track-title:before{content:"";border-radius:var(--oct-radius-full);background:var(--track-hue);flex:none;width:.55em;height:.55em}.progress-quiet{margin-top:var(--oct-space-2)}.topic-list{gap:var(--oct-space-2) var(--oct-space-8);margin-top:var(--oct-space-5);grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));display:grid}.topic-list>li{padding-left:var(--oct-space-5);font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content);line-height:1.5;position:relative}.topic-list>li:before{content:"";border-radius:var(--oct-radius-full);background:var(--course-hue,var(--sem-accent));width:6px;height:6px;position:absolute;top:.62em;left:0}.course-facts{gap:var(--oct-space-6);margin-top:var(--oct-space-10);padding-top:var(--oct-space-6);border-top:1px solid var(--sem-line-muted);grid-template-columns:repeat(auto-fit,minmax(16rem,1fr));display:grid}.course-fact-label{font-size:var(--oct-text-2xs);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-widest);text-transform:uppercase;color:var(--sem-content-subtle)}.course-fact-body{margin-top:var(--oct-space-2);font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content-muted);line-height:1.55}.curriculum{margin-top:var(--oct-space-4)}.lesson{align-items:center;gap:var(--oct-space-3);padding:var(--oct-space-3) var(--oct-space-2);margin-inline:calc(var(--oct-space-2) * -1);border-radius:var(--oct-radius-sm);transition:background-color var(--oct-duration-fast) var(--oct-ease);grid-template-columns:auto minmax(0,1fr) auto;display:grid}.lesson:hover{background:var(--sem-surface-hover)}.lesson[aria-current=page]{background:var(--sem-accent-wash);box-shadow:inset 2px 0 0 var(--sem-accent)}.lesson-tick{border:1.5px solid var(--sem-line-strong);border-radius:var(--oct-radius-full);color:#0000;cursor:pointer;width:1.25rem;height:1.25rem;transition:background-color var(--oct-duration-fast) var(--oct-ease), border-color var(--oct-duration-fast) var(--oct-ease), color var(--oct-duration-fast) var(--oct-ease);place-items:center;display:grid}.lesson-tick svg{width:.7rem;height:.7rem}.lesson-tick:hover{border-color:var(--sem-accent)}.lesson-tick[aria-checked=true]{background:var(--sem-accent);border-color:var(--sem-accent);color:var(--sem-accent-contrast)}.lesson-tick:focus-visible{outline:2px solid var(--sem-focus);outline-offset:2px}.lesson-title{font-family:var(--oct-font-reading);font-size:var(--oct-text-base);color:var(--sem-content-strong);line-height:1.35;display:block}.lesson.is-done .lesson-title{color:var(--sem-content-muted)}.lesson-num{font-family:var(--oct-font-mono);font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--sem-content-subtle)}.curriculum-compact .lesson{padding-block:var(--oct-space-2)}.curriculum-compact .lesson-title{font-size:var(--oct-text-sm)}.player{aspect-ratio:16/9;border-radius:var(--sem-card-radius);border:1px solid var(--sem-card-border);box-shadow:var(--sem-card-shadow);margin:var(--oct-space-5) 0 var(--oct-space-8);color:var(--course-hue);background:linear-gradient(150deg, var(--course-hue), transparent 65%), var(--sem-surface-inset);position:relative;overflow:hidden}@supports (color:color-mix(in lab, red, red)){.player{background:linear-gradient(150deg, color-mix(in srgb, var(--course-hue) 14%, transparent), transparent 65%), var(--sem-surface-inset)}}.player-frame{border:0;width:100%;height:100%;position:absolute;inset:0}.lesson-crumb{align-items:center;gap:var(--oct-space-2);font-size:var(--oct-text-xs);color:var(--sem-content-subtle);flex-wrap:wrap;display:flex}.lesson-crumb a{color:var(--sem-content-muted)}.lesson-crumb a:hover{color:var(--sem-accent)}.lesson-h1{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-3xl);font-weight:var(--oct-weight-bold);line-height:var(--oct-leading-tight);letter-spacing:var(--oct-tracking-tighter);color:var(--sem-heading)}.lesson-actions{align-items:center;gap:var(--oct-space-3);margin-top:var(--oct-space-8);padding-top:var(--oct-space-6);border-top:1px solid var(--sem-line-muted);flex-wrap:wrap;display:flex}.lesson-prev{font-size:var(--oct-text-sm);color:var(--sem-content-subtle);max-width:22ch;margin-left:auto}.lesson-prev:hover{color:var(--sem-accent)}.buybox-sub{font-size:var(--oct-text-sm);color:var(--sem-content-muted);margin-top:2px}.write-progress{margin-top:var(--oct-space-4)}.write-progress-head{justify-content:space-between;align-items:baseline;gap:var(--oct-space-3);margin-bottom:var(--oct-space-2);font-size:var(--oct-text-xs);letter-spacing:var(--oct-tracking-wide);text-transform:uppercase;color:var(--sem-content-subtle);display:flex}.write-progress-pct{font-family:var(--oct-font-mono);font-variant-numeric:tabular-nums;text-transform:none;letter-spacing:0;color:var(--sem-content-strong)}.buybox-state{padding:var(--oct-space-3) 0;font-size:var(--oct-text-sm);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-wide);text-transform:uppercase;color:var(--sem-content-muted);border-top:1px solid var(--sem-line);border-bottom:1px solid var(--sem-line);text-align:center}.buybox-alt{width:100%;margin-top:var(--oct-space-2)}@media (width<=48rem){.course-row{grid-template-columns:minmax(0,1fr)}.lesson{grid-template-columns:auto minmax(0,1fr) auto}}.series-index{margin-top:var(--oct-space-6);flex-direction:column;display:flex}.series-row{gap:var(--oct-space-6);padding:var(--oct-space-6) 0;border-bottom:1px solid var(--sem-line-muted);grid-template-columns:13rem minmax(0,1fr);display:grid}.series-row-art{aspect-ratio:16/9;border-radius:var(--sem-card-radius);border:1px solid var(--sem-card-border);box-shadow:var(--sem-card-shadow);color:var(--series-hue);background:linear-gradient(150deg, var(--series-hue), transparent 65%), var(--sem-card-bg);display:block;overflow:hidden}@supports (color:color-mix(in lab, red, red)){.series-row-art{background:linear-gradient(150deg, color-mix(in srgb, var(--series-hue) 16%, transparent), transparent 65%), var(--sem-card-bg)}}.series-row-art svg{opacity:.8;width:100%;height:100%}.series-track-index{margin-top:var(--oct-space-4);max-width:18rem}@media (width<=48rem){.series-row{grid-template-columns:minmax(0,1fr)}}.rail-product{gap:var(--oct-space-3);padding:var(--oct-space-3) 0;border-bottom:1px solid var(--sem-line-muted);grid-template-columns:auto minmax(0,1fr);align-items:start;display:grid}.rail-product:last-child{border-bottom:0}.rail-product-art{border-radius:var(--oct-radius-sm);color:var(--rp-hue);transition:transform var(--oct-duration-normal) var(--oct-ease);flex:none;display:block;overflow:hidden}.rail-product-art-book{width:3.25rem}.rail-product-art-wide{aspect-ratio:16/9;border:1px solid var(--sem-card-border);width:4.5rem;box-shadow:var(--sem-card-shadow);background:linear-gradient(150deg, var(--rp-hue), transparent 65%), var(--sem-card-bg)}@supports (color:color-mix(in lab, red, red)){.rail-product-art-wide{background:linear-gradient(150deg, color-mix(in srgb, var(--rp-hue) 18%, transparent), transparent 65%), var(--sem-card-bg)}}.rail-product-art-wide svg{width:100%;height:100%}.rail-product:hover .rail-product-art{transform:translateY(-2px)}.rail-product-title{font-family:var(--oct-font-display);font-variation-settings:var(--oct-display-settings);font-size:var(--oct-text-base);font-weight:var(--oct-weight-semibold);letter-spacing:var(--oct-tracking-tight);color:var(--sem-heading);line-height:1.25;display:block}.rail-product:hover .rail-product-title{color:var(--rp-hue)}.rail-product-sub{-webkit-line-clamp:2;font-family:var(--oct-font-reading);font-size:var(--oct-text-sm);color:var(--sem-content-muted);-webkit-box-orient:vertical;margin-top:2px;line-height:1.35;display:-webkit-box;overflow:hidden}.rail-product-meta{margin-top:var(--oct-space-2);font-size:var(--oct-text-xs);font-variant-numeric:tabular-nums;color:var(--rp-hue);display:block}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}