@import url("https://fonts.googleapis.com/css2?family=Manrope:wght@500;600;700;800&family=Source+Serif+4:opsz,wght@8..60,400;8..60,600;8..60,700&display=swap");.bl-page{--bl-bg:#f4f6f9;--bl-bg-accent:#e8eef6;--bl-surface:#fff;--bl-ink:#0f172a;--bl-muted:#4b5568;--bl-faint:#6b7280;--bl-line:rgba(15,23,42,.09);--bl-accent:#0f172a;--bl-accent-soft:#1e293b;--bl-tone:#2563eb;--bl-tone-soft:rgba(37,99,235,.1);--bl-ok:#0f766e;--bl-warn:#b45309;--bl-danger:#b91c1c;--bl-radius:18px;--bl-read:46rem;--bl-max:72rem;--bl-space:clamp(1.1rem,3.5vw,2.25rem);--bl-font-ui:"Manrope",ui-sans-serif,system-ui,sans-serif;--bl-font-body:"Source Serif 4","Iowan Old Style","Palatino Linotype",Georgia,serif;min-height:100vh;color:var(--bl-ink);background:radial-gradient(1200px 500px at 10% -10%,var(--bl-bg-accent),transparent 60%),radial-gradient(900px 420px at 100% 0,#edf2f8,transparent 55%),var(--bl-bg);font-family:var(--bl-font-ui)}.bl-skip{position:absolute;left:-9999px;z-index:50;padding:.55rem .9rem;background:var(--bl-accent);color:#fff;text-decoration:none}.bl-skip:focus{left:1rem;top:1rem}.bl-container{width:100%;max-width:var(--bl-max);margin:0 auto;padding:0 var(--bl-space)}.bl-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;border-bottom:1px solid var(--bl-line);background:hsla(0,0%,100%,.86);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.bl-header-inner{display:flex;align-items:center;justify-content:space-between;gap:1.25rem;padding:1rem 0}.bl-brand{gap:.7rem;text-decoration:none;color:inherit;min-width:0}.bl-brand,.bl-brand-mark{display:inline-flex;align-items:center}.bl-brand-mark{justify-content:center;width:2.25rem;height:2.25rem;border-radius:.55rem;color:#f8fafc;background:#0f172a;flex-shrink:0}.bl-brand-mark svg{width:1.15rem;height:1.15rem}.bl-brand-text{display:flex;flex-direction:column;gap:.12rem;min-width:0}.bl-brand-name{font-weight:800;font-size:clamp(1.05rem,2.4vw,1.22rem);letter-spacing:-.03em;line-height:1.1;color:var(--bl-ink)}.bl-brand-tag{font-size:.75rem;color:var(--bl-faint);letter-spacing:.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bl-nav{display:flex;align-items:center;gap:.15rem 1.35rem;flex-wrap:wrap;justify-content:flex-end}.bl-nav a{position:relative;color:var(--bl-muted);text-decoration:none;font-size:.9rem;font-weight:600;padding:.2rem 0}.bl-nav a:focus-visible,.bl-nav a:hover{color:var(--bl-ink)}.bl-nav a:after{content:"";position:absolute;left:0;right:0;bottom:-.15rem;height:1px;background:currentColor;opacity:0;transform:scaleX(.4);transform-origin:left center;transition:opacity .15s ease,transform .15s ease}.bl-nav a:focus-visible:after,.bl-nav a:hover:after{opacity:.35;transform:scaleX(1)}.bl-nav a.is-active{color:var(--bl-ink)}.bl-nav a.is-active:before{content:"";display:inline-block;width:.35rem;height:.35rem;margin-right:.45rem;border-radius:50%;background:#2563eb;vertical-align:.1rem}.bl-header-actions{display:flex;align-items:center;gap:.85rem 1.25rem;flex-wrap:wrap;justify-content:flex-end;min-width:0}.bl-search-trigger{display:inline-flex;align-items:center;gap:.45rem;margin:0;padding:.38rem .7rem;border:1px solid var(--bl-line);border-radius:999px;background:hsla(0,0%,100%,.92);color:var(--bl-muted);font:inherit;font-size:.86rem;font-weight:600;cursor:pointer;transition:border-color .15s ease,color .15s ease,background .15s ease}.bl-search-trigger:focus-visible,.bl-search-trigger:hover{color:var(--bl-ink);border-color:rgba(37,99,235,.35);background:#fff;outline:none}.bl-search-trigger svg{width:1rem;height:1rem;flex-shrink:0}.bl-search-kbd{display:inline-flex;align-items:center;padding:.12rem .38rem;border:1px solid var(--bl-line);border-radius:.35rem;background:var(--bl-bg);color:var(--bl-faint);font-size:.68rem;font-weight:700;letter-spacing:.02em;line-height:1.2}.bl-search-dialog{width:min(40rem,calc(100vw - 1.5rem));max-width:40rem;margin:min(12vh,5rem) auto auto;padding:0;border:1px solid var(--bl-line);border-radius:1rem;background:transparent;box-shadow:0 24px 60px rgba(15,23,42,.18)}.bl-search-dialog::-webkit-backdrop{background:rgba(15,23,42,.42);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.bl-search-dialog::backdrop{background:rgba(15,23,42,.42);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.bl-search-panel{overflow:hidden;border-radius:1rem;background:var(--bl-surface)}.bl-search-bar{display:flex;align-items:center;gap:.65rem;padding:.95rem 1rem;border-bottom:1px solid var(--bl-line)}.bl-search-bar svg{width:1.15rem;height:1.15rem;color:var(--bl-faint);flex-shrink:0}.bl-search-bar input{flex:1 1;min-width:0;border:0;background:transparent;color:var(--bl-ink);font:inherit;font-size:1.05rem;font-weight:600;outline:none}.bl-search-bar input::placeholder{color:var(--bl-faint);font-weight:500}.bl-search-close{margin:0;padding:.2rem .45rem;border:1px solid var(--bl-line);border-radius:.4rem;background:var(--bl-bg);color:var(--bl-faint);font:inherit;font-size:.72rem;font-weight:700;cursor:pointer}.bl-search-hint{margin:0;padding:.55rem 1rem .15rem;color:var(--bl-faint);font-size:.78rem}.bl-search-results{max-height:min(52vh,24rem);overflow:auto;padding:.35rem .45rem .7rem}.bl-search-empty{margin:.55rem .55rem .35rem;color:var(--bl-muted);font-size:.92rem;line-height:1.45}.bl-search-hit{display:flex;flex-direction:column;gap:.28rem;width:100%;margin:0;padding:.75rem .8rem;border:0;border-radius:.75rem;background:transparent;color:inherit;text-align:left;font:inherit;cursor:pointer}.bl-search-hit.is-active,.bl-search-hit:hover{background:var(--bl-tone-soft)}.bl-search-hit-top{display:flex;align-items:baseline;justify-content:space-between;gap:.75rem}.bl-search-hit-title{font-size:.95rem;font-weight:700;letter-spacing:-.015em;color:var(--bl-ink)}.bl-search-hit-field{flex-shrink:0;color:var(--bl-tone);font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em}.bl-search-hit-snippet{color:var(--bl-muted);font-family:var(--bl-font-body);font-size:.92rem;line-height:1.4}.bl-search-hit-snippet mark,.bl-search-page-snippet mark{padding:0 .12em;border-radius:.2em;background:#fde68a;color:inherit}.bl-search-hit-meta{display:flex;flex-wrap:wrap;gap:.35rem .75rem;color:var(--bl-faint);font-size:.78rem;font-weight:600}.bl-search-footer{display:flex;justify-content:flex-end;padding:.65rem 1rem .9rem;border-top:1px solid var(--bl-line)}.bl-search-all{color:var(--bl-tone);font-size:.86rem;font-weight:700;text-decoration:none}.bl-search-all:focus-visible,.bl-search-all:hover{text-decoration:underline}.bl-search-page-hero{padding-bottom:.5rem}.bl-search-page-form{display:flex;gap:.65rem;align-items:center;margin-top:1.25rem;max-width:40rem}.bl-search-page-form input{flex:1 1;min-width:0;padding:.75rem .95rem;border:1px solid var(--bl-line);border-radius:.85rem;background:var(--bl-surface);color:var(--bl-ink);font:inherit;font-size:1rem;font-weight:600}.bl-search-page-form input:focus-visible{outline:2px solid rgba(37,99,235,.35);outline-offset:1px}.bl-search-count{margin-left:.65rem;color:var(--bl-faint);font-size:.9rem;font-weight:600}.bl-search-page-list{list-style:none;margin:0;padding:0;display:grid;grid-gap:.75rem;gap:.75rem}.bl-search-page-item{display:block;padding:1rem 1.1rem;border:1px solid var(--bl-line);border-radius:1rem;background:var(--bl-surface);text-decoration:none;color:inherit;transition:border-color .15s ease,box-shadow .15s ease}.bl-search-page-item:focus-visible,.bl-search-page-item:hover{border-color:rgba(37,99,235,.35);box-shadow:0 10px 28px rgba(15,23,42,.06);outline:none}.bl-search-page-item-top{display:flex;align-items:baseline;justify-content:space-between;gap:.85rem}.bl-search-page-item h3{margin:0;font-size:1.08rem;letter-spacing:-.02em}.bl-search-page-badge{flex-shrink:0;color:var(--bl-tone);font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em}.bl-search-page-snippet{margin:.45rem 0 .35rem;color:var(--bl-muted);font-family:var(--bl-font-body);font-size:1rem;line-height:1.45}.bl-search-page-meta{margin:0;color:var(--bl-faint);font-size:.82rem;font-weight:600}.bl-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.bl-main{padding:clamp(1.5rem,4vw,2.75rem) 0 4rem}.bl-footer{border-top:1px solid var(--bl-line);padding:1.75rem 0 2.5rem;margin-top:1rem}.bl-footer-inner{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:.55rem 1.5rem}.bl-footer-credit{margin:0;color:var(--bl-muted);font-size:.92rem}.bl-footer-credit a{color:var(--bl-ink);font-weight:700;text-decoration:none}.bl-footer-credit a:hover{text-decoration:underline}.bl-footer-copy{margin:0;color:var(--bl-faint);font-size:.88rem}.bl-footer-muted{color:var(--bl-faint);margin:0;font-size:.92rem}.bl-hero{padding:.5rem 0 2rem;max-width:44rem}.bl-hero h1{font-size:clamp(2rem,5vw,3.1rem);line-height:1.08;letter-spacing:-.04em;margin:0 0 .85rem;font-weight:800}.bl-hero-lead{font-family:var(--bl-font-body);font-size:clamp(1.08rem,2.2vw,1.28rem);line-height:1.55;color:var(--bl-muted);margin:0 0 1.4rem}.bl-hero-actions{display:flex;flex-wrap:wrap;gap:.7rem}.bl-btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;border-radius:999px;padding:.7rem 1.15rem;font-weight:700;font-size:.94rem;text-decoration:none;border:1px solid transparent;transition:transform .15s ease,background .15s ease,color .15s ease}.bl-btn:hover{transform:translateY(-1px)}.bl-btn--primary{background:var(--bl-accent);color:#fff}.bl-btn--primary:hover{background:var(--bl-accent-soft)}.bl-btn--ghost{background:transparent;border-color:var(--bl-line);color:var(--bl-ink)}.bl-btn--ghost:hover{background:var(--bl-surface)}.bl-section{margin-top:2.5rem}.bl-section-title{font-size:1.35rem;letter-spacing:-.02em;margin:0 0 1rem}.bl-section-lead{margin:-.35rem 0 1.25rem;max-width:42rem;color:var(--bl-muted);font-size:1.02rem;line-height:1.55}.bl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,18.5rem),1fr));grid-gap:1rem;gap:1rem}.bl-card{background:var(--bl-surface);border:1px solid var(--bl-line);border-radius:var(--bl-radius);overflow:hidden;display:flex;flex-direction:column;min-height:100%;transition:border-color .15s ease,box-shadow .15s ease;padding:0}.bl-card:hover{border-color:rgba(37,99,235,.28);box-shadow:0 12px 28px rgba(15,23,42,.06)}.bl-card-media{display:block;aspect-ratio:16/9;background:#e2e8f0;overflow:hidden}.bl-card-image{width:100%;height:100%;object-fit:cover;display:block;transition:transform .25s ease}.bl-card:hover .bl-card-image{transform:scale(1.03)}.bl-card-body{display:flex;flex-direction:column;gap:.65rem;padding:1.05rem 1.15rem 1.15rem;flex:1 1}.bl-card-meta{display:flex;flex-wrap:wrap;gap:.45rem;align-items:center}.bl-card-title{margin:0;font-size:1.12rem;letter-spacing:-.02em;line-height:1.3}.bl-card-title a{color:inherit;text-decoration:none}.bl-card-title a:hover{color:var(--bl-tone)}.bl-card-desc{margin:0;color:var(--bl-muted);font-size:.95rem;line-height:1.5;flex:1 1}.bl-card-foot{display:flex;justify-content:space-between;gap:.75rem;color:var(--bl-faint);font-size:.82rem;font-weight:600}.bl-chip,.bl-meta-pill{display:inline-flex;align-items:center;border-radius:999px;padding:.22rem .65rem;font-size:.75rem;font-weight:700;text-decoration:none}.bl-chip{background:var(--bl-tone-soft);color:#1d4ed8}.bl-meta-pill{background:#eef2f7;color:var(--bl-muted)}.bl-cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,15rem),1fr));grid-gap:.75rem;gap:.75rem}.bl-cat-list{display:grid;grid-gap:0;gap:0;border-top:1px solid var(--bl-line)}.bl-cat-row{display:grid;grid-template-columns:2.5rem minmax(0,1fr) auto;grid-gap:.85rem 1rem;gap:.85rem 1rem;align-items:start;padding:1rem .15rem;border-bottom:1px solid var(--bl-line);text-decoration:none;color:inherit;transition:background .15s ease,padding-left .15s ease}.bl-cat-row:hover{background:hsla(0,0%,100%,.55);padding-left:.35rem}.bl-cat-row-num{font-family:var(--bl-font-ui);font-weight:800;font-size:.92rem;color:#1d4ed8;line-height:1.4;padding-top:.1rem}.bl-cat-row-copy{display:flex;flex-direction:column;gap:.28rem;min-width:0}.bl-cat-row-title{font-family:var(--bl-font-ui);font-weight:800;font-size:1.05rem;letter-spacing:-.02em;line-height:1.25;color:var(--bl-ink)}.bl-cat-row:hover .bl-cat-row-title{color:#1d4ed8}.bl-cat-row-desc{color:var(--bl-muted);font-size:.92rem;line-height:1.45}.bl-cat-row-count{display:flex;flex-direction:column;align-items:flex-end;gap:.1rem;font-family:var(--bl-font-ui);font-weight:800;font-size:1.05rem;color:var(--bl-ink);line-height:1.2;padding-top:.1rem;white-space:nowrap}.bl-cat-row-count-label{font-size:.72rem;font-weight:600;color:var(--bl-faint);text-transform:lowercase}.bl-cat-card{display:block;text-decoration:none;color:inherit;background:var(--bl-surface);border:1px solid var(--bl-line);border-radius:16px;overflow:hidden;padding:0;transition:border-color .15s ease,transform .15s ease,box-shadow .15s ease}.bl-cat-card:hover{border-color:rgba(37,99,235,.3);transform:translateY(-1px);box-shadow:0 10px 22px rgba(15,23,42,.05)}.bl-app-card{display:flex;align-items:flex-start;gap:.85rem;padding:1rem 1.05rem 1.1rem}.bl-app-card-icon{flex-shrink:0;width:3rem;height:3rem;border-radius:.8rem;box-shadow:0 6px 14px rgba(15,23,42,.12)}.bl-app-card-copy{display:flex;flex-direction:column;gap:.3rem;min-width:0}.bl-app-card-name{margin:0;font-size:1rem;font-weight:700;line-height:1.25;color:var(--bl-ink)}.bl-app-card-blurb{margin:0;font-size:.88rem;line-height:1.45;color:var(--bl-muted)}.bl-app-card-cta{align-self:flex-start;margin-top:.55rem;padding:.45rem .9rem;font-size:.82rem}.bl-cat-count{display:inline-block;margin-top:.55rem;font-size:.78rem;font-weight:700;color:var(--bl-faint)}.bl-breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:.35rem .45rem;padding:0;margin:0 0 1.25rem;color:var(--bl-faint);font-size:.86rem}.bl-breadcrumbs li:not(:last-child):after{content:"/";margin-left:.45rem;opacity:.55}.bl-breadcrumbs a{color:var(--bl-muted);text-decoration:none}.bl-breadcrumbs a:hover{color:var(--bl-ink)}.bl-article-layout{display:grid;grid-template-columns:minmax(0,1fr);grid-gap:2rem;gap:2rem;align-items:start}@media (min-width:1080px){.bl-article-layout{grid-template-columns:minmax(0,1fr) 15rem}}.bl-article-main{max-width:var(--bl-read)}.bl-article-header h1{font-size:clamp(1.85rem,4.2vw,2.65rem);letter-spacing:-.035em;line-height:1.12;margin:.35rem 0 .85rem}.bl-article-deck{font-family:var(--bl-font-body);font-size:1.15rem;line-height:1.55;color:var(--bl-muted);margin:0 0 1rem}.bl-article-meta{display:flex;flex-wrap:wrap;gap:.45rem .9rem;color:var(--bl-faint);font-size:.88rem;font-weight:600;margin-bottom:1.5rem}.bl-article-cover{margin:0 0 1.75rem}.bl-article-cover-image{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover;display:block;border-radius:16px;background:#e2e8f0}.bl-article-cover-caption{margin:.55rem 0 0;font-size:.86rem;color:var(--bl-faint);line-height:1.4}.bl-toc{position:-webkit-sticky;position:sticky;top:5.5rem;background:var(--bl-surface);border:1px solid var(--bl-line);border-radius:14px;padding:1rem 1.05rem}.bl-toc-title{margin:0 0 .55rem;font-size:.78rem;text-transform:uppercase;letter-spacing:.06em;color:var(--bl-faint);font-weight:800}.bl-toc-list{list-style:none;margin:0;padding:0;display:grid;grid-gap:.4rem;gap:.4rem}.bl-toc-list a{color:var(--bl-muted);text-decoration:none;font-size:.88rem;line-height:1.35}.bl-toc-list a:hover{color:var(--bl-tone)}.bl-toc-list .is-h3{padding-left:.75rem}.bl-prose{font-family:var(--bl-font-body);font-size:1.08rem;line-height:1.75;color:#1f2937}.bl-prose>:first-child{margin-top:0}.bl-prose h2{font-size:1.45rem;letter-spacing:-.025em;margin:2.2rem 0 .8rem}.bl-prose h2,.bl-prose h3{font-family:var(--bl-font-ui);scroll-margin-top:5.5rem}.bl-prose h3{font-size:1.15rem;margin:1.6rem 0 .55rem}.bl-prose ol,.bl-prose p,.bl-prose ul{margin:0 0 1rem}.bl-prose a{color:#1d4ed8}.bl-prose code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;background:#eef2f7;padding:.1rem .35rem;border-radius:.35rem}.bl-callout{border-radius:16px;padding:1rem 1.05rem 1.05rem;margin:1.35rem 0;border:1px solid transparent;background:#f8fafc;box-shadow:0 1px 0 rgba(15,23,42,.03)}.bl-callout-head{display:flex;align-items:center;gap:.55rem;margin-bottom:.45rem}.bl-callout-icon{display:inline-flex;align-items:center;justify-content:center;width:1.7rem;height:1.7rem;border-radius:.55rem;flex-shrink:0;color:inherit;background:rgba(15,23,42,.06)}.bl-callout-icon svg{width:1rem;height:1rem}.bl-icon{display:inline-flex;align-items:center;justify-content:center;vertical-align:-.15em;color:inherit}.bl-icon svg{width:1.05em;height:1.05em}.bl-callout-icon--on-dark{background:hsla(0,0%,100%,.14);color:#fff}.bl-callout-label{margin:0;font-family:var(--bl-font-ui);font-size:.78rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;line-height:1.2}.bl-callout-body{font-size:1rem;padding-left:.1rem}.bl-callout-body>:first-child{margin-top:0}.bl-callout-body>:last-child{margin-bottom:0}.bl-callout--definition{background:#eff6ff;border-color:#dbeafe;color:#1e3a8a}.bl-callout--definition .bl-callout-icon{background:#dbeafe;color:#1d4ed8}.bl-callout--definition .bl-callout-body{color:var(--bl-ink)}.bl-callout--key{background:#f0fdfa;border-color:#ccfbf1;color:#115e59}.bl-callout--key .bl-callout-icon{background:#ccfbf1;color:#0f766e}.bl-callout--key .bl-callout-body{color:var(--bl-ink)}.bl-callout--mistake{background:#fff1f2;border-color:#fecdd3;color:#9f1239}.bl-callout--mistake .bl-callout-icon{background:#fecdd3;color:#be123c}.bl-callout--mistake .bl-callout-body{color:var(--bl-ink)}.bl-callout--tip{background:#fffbeb;border-color:#fde68a;color:#92400e}.bl-callout--tip .bl-callout-icon{background:#fde68a;color:#b45309}.bl-callout--tip .bl-callout-body{color:var(--bl-ink)}.bl-callout--important{background:#f8fafc;border-color:#cbd5e1;color:#0f172a}.bl-callout--important .bl-callout-icon{background:#e2e8f0;color:#334155}.bl-callout--remember{background:#ecfeff;border-color:#a5f3fc;color:#155e75}.bl-callout--remember .bl-callout-icon{background:#a5f3fc;color:#0e7490}.bl-callout--remember .bl-callout-body{color:var(--bl-ink)}.bl-callout--encourage{background:#fff7ed;border-color:#fed7aa;color:#9a3412}.bl-callout--encourage .bl-callout-icon{background:#fed7aa;color:#c2410c}.bl-callout--encourage .bl-callout-body{color:var(--bl-ink)}.bl-callout--example{background:#f0fdf4;border-color:#bbf7d0;color:#166534}.bl-callout--example .bl-callout-icon{background:#bbf7d0;color:#15803d}.bl-callout--example .bl-callout-body{color:var(--bl-ink)}.bl-callout--note{background:#f8fafc;border-color:#e2e8f0;color:#334155}.bl-callout--note .bl-callout-icon{background:#e2e8f0;color:#475569}.bl-callout--note .bl-callout-body{color:var(--bl-ink)}.bl-accordion{margin:1.35rem 0 1.6rem}.bl-accordion-heading{margin:0 0 .65rem;font-family:var(--bl-font-ui);font-size:.82rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--bl-faint)}.bl-accordion-list{display:grid;grid-gap:.55rem;gap:.55rem}.bl-accordion-item{border:1px solid var(--bl-line);border-radius:14px;background:var(--bl-surface);overflow:hidden}.bl-accordion-summary{display:flex;align-items:center;justify-content:space-between;gap:.85rem;list-style:none;cursor:pointer;padding:.95rem 1rem;font-family:var(--bl-font-ui);font-weight:700;font-size:.98rem;line-height:1.35;color:var(--bl-ink);min-height:3.1rem;-webkit-user-select:none;-moz-user-select:none;user-select:none}.bl-accordion-summary::-webkit-details-marker{display:none}.bl-accordion-summary-text{flex:1 1;min-width:0}.bl-accordion-chevron{width:1.55rem;height:1.55rem;border-radius:999px;flex-shrink:0;background:#eef2f7;position:relative}.bl-accordion-chevron:after,.bl-accordion-chevron:before{content:"";position:absolute;inset:50% auto auto 50%;width:.55rem;height:2px;background:#475569;transform:translate(-50%,-50%);border-radius:2px;transition:transform .18s ease}.bl-accordion-chevron:after{transform:translate(-50%,-50%) rotate(90deg)}.bl-accordion-item[open] .bl-accordion-chevron:after{transform:translate(-50%,-50%) rotate(0deg);opacity:0}.bl-accordion-item[open]>.bl-accordion-summary{border-bottom:1px solid var(--bl-line);background:#f8fafc}.bl-accordion-panel{padding:.9rem 1rem 1.05rem;color:var(--bl-muted);font-family:var(--bl-font-body);font-size:1.02rem;line-height:1.6}.bl-accordion-panel>:first-child{margin-top:0}.bl-accordion-panel>:last-child{margin-bottom:0}.bl-concept-grid{display:grid;grid-gap:.75rem;gap:.75rem;margin:1.25rem 0;grid-template-columns:1fr}@media (min-width:560px){.bl-concept-grid{grid-template-columns:repeat(auto-fit,minmax(14.5rem,1fr))}}.bl-concept-card{border-radius:16px;border:1px solid var(--bl-line);background:var(--bl-surface);padding:1rem}.bl-concept-card-head{display:flex;align-items:center;gap:.55rem;margin-bottom:.45rem}.bl-concept-card-title{margin:0;font-family:var(--bl-font-ui);font-size:1rem;font-weight:800;letter-spacing:-.01em;line-height:1.3}.bl-concept-card-body{color:var(--bl-muted);font-size:.98rem;line-height:1.55}.bl-concept-card-body>:last-child{margin-bottom:0}.bl-concept-card--definition{background:#eff6ff;border-color:#dbeafe}.bl-concept-card--example,.bl-concept-card--key{background:#f0fdf4;border-color:#bbf7d0}.bl-concept-card--remember{background:#ecfeff;border-color:#a5f3fc}.bl-concept-card--tip{background:#fffbeb;border-color:#fde68a}.bl-concept-card--mistake{background:#fff1f2;border-color:#fecdd3}.bl-steps{list-style:none;margin:1.25rem 0;padding:0;display:grid;grid-gap:.7rem;gap:.7rem;counter-reset:bl-step}.bl-step{counter-increment:bl-step;display:grid;grid-template-columns:2rem minmax(0,1fr);grid-gap:.75rem;gap:.75rem;align-items:start;padding:.85rem .95rem;border-radius:14px;border:1px solid var(--bl-line);background:var(--bl-surface)}.bl-step:before{content:counter(bl-step);display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border-radius:999px;background:#e0e7ff;color:#3730a9;font-family:var(--bl-font-ui);font-weight:800;font-size:.88rem}.bl-step-content{min-width:0}.bl-step-title{margin:0 0 .25rem;font-family:var(--bl-font-ui);font-weight:800;font-size:.98rem}.bl-step-body{color:var(--bl-muted);font-size:.98rem;line-height:1.55}.bl-step-body>:first-child{margin-top:0}.bl-step-body>:last-child{margin-bottom:0}.bl-summary{margin:1.6rem 0 .5rem;border-radius:18px;border:1px solid #bbf7d0;background:linear-gradient(180deg,#f0fdf4,#fff 70%);padding:1.05rem 1.1rem 1.15rem}.bl-summary-head{display:flex;align-items:center;gap:.55rem;margin-bottom:.55rem}.bl-summary-title{margin:0;font-family:var(--bl-font-ui);font-size:.82rem;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:#166534}.bl-summary-body{color:var(--bl-ink)}.bl-summary-body ul{margin:.35rem 0 0;padding-left:1.15rem}.bl-summary-body li{margin:.35rem 0}.bl-exercise{margin:1.5rem 0;border:1px solid var(--bl-line);border-radius:16px;overflow:hidden;background:var(--bl-surface)}.bl-exercise-head{display:flex;justify-content:space-between;gap:.75rem;align-items:center;padding:.85rem 1.1rem;background:linear-gradient(135deg,#0f172a,#1e293b 70%,#1d4ed8 140%);color:#fff}.bl-exercise-head-main{display:flex;align-items:center;gap:.55rem;min-width:0}.bl-exercise-title{margin:0;font-family:var(--bl-font-ui);font-size:1rem;line-height:1.3}.bl-exercise-meta{font-size:.8rem;opacity:.85;font-family:var(--bl-font-ui);white-space:nowrap;background:hsla(0,0%,100%,.12);border-radius:999px;padding:.28rem .65rem}.bl-exercise-body{padding:1rem 1.1rem 1.15rem}@media (max-width:520px){.bl-callout{padding:.9rem .9rem .95rem}.bl-accordion-summary,.bl-course-accordion-summary{padding:.9rem .85rem;font-size:.95rem}.bl-exercise-head{flex-wrap:wrap;align-items:flex-start}}.bl-progression{margin:1.2rem 0}.bl-progression-label{margin:0 0 .45rem;font-family:var(--bl-font-ui);font-size:.82rem;font-weight:700;color:var(--bl-faint)}.bl-progression-list{list-style:none;display:flex;flex-wrap:wrap;gap:.5rem;margin:0;padding:0}.bl-progression-chord{font-family:var(--bl-font-ui);font-weight:800;background:#0f172a;color:#fff;border-radius:.65rem;padding:.55rem .8rem;min-width:3.2rem;text-align:center}.bl-formula{display:flex;flex-wrap:wrap;align-items:center;gap:.55rem;margin:1.1rem 0;padding:.9rem 1rem;border-radius:12px;background:#eef2f7;font-family:var(--bl-font-ui)}.bl-formula-name{font-weight:800}.bl-formula-sep{color:var(--bl-faint)}.bl-formula-notes{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-weight:600}.bl-formula-intervals{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-weight:700;color:#1d4ed8;letter-spacing:.02em}.bl-fretboard-notes{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:.75rem}.bl-fretboard-note{display:inline-flex;align-items:center;justify-content:center;min-width:2.4rem;padding:.35rem .65rem;border-radius:999px;background:#0f172a;color:#fff;font-family:var(--bl-font-ui);font-weight:800;font-size:.9rem}.bl-table-wrap{overflow-x:auto;margin:1.35rem 0;border:1px solid var(--bl-line);border-radius:14px;background:var(--bl-surface)}.bl-prose table{width:100%;border-collapse:collapse;font-family:var(--bl-font-ui);font-size:.92rem}.bl-prose td,.bl-prose th{padding:.7rem .85rem;border-bottom:1px solid var(--bl-line);text-align:left;vertical-align:top}.bl-prose th{background:#0f172a;color:#fff;font-size:.78rem;letter-spacing:.04em;text-transform:uppercase}.bl-prose tr:last-child td{border-bottom:none}.bl-prose tbody tr:nth-child(2n){background:#f8fafc}.bl-audio,.bl-fretboard{margin:1.4rem 0}.bl-fretboard-board{display:grid;grid-gap:.45rem;gap:.45rem;padding:1rem;border-radius:14px;background:linear-gradient(180deg,#1e293b,#0f172a)}.bl-fretboard-string{display:grid;grid-template-columns:repeat(5,1fr);grid-gap:.35rem;gap:.35rem}.bl-fretboard-dot{height:1.65rem;border-radius:999px;border:1px solid hsla(0,0%,100%,.18);background:hsla(0,0%,100%,.04)}.bl-fretboard-dot.is-active{background:#60a5fa;border-color:#93c5fd;box-shadow:0 0 0 3px rgba(96,165,250,.25)}.bl-audio figcaption,.bl-fretboard figcaption{margin-top:.45rem;font-family:var(--bl-font-ui);font-size:.85rem;color:var(--bl-faint)}.bl-audio-placeholder{border:1px dashed var(--bl-line);border-radius:12px;padding:1.1rem;text-align:center;color:var(--bl-faint);font-family:var(--bl-font-ui)}.bl-youtube{margin:1.6rem 0}.bl-youtube-frame{position:relative;width:100%;aspect-ratio:16/9;border-radius:14px;overflow:hidden;background:#0f172a;border:1px solid var(--bl-line);box-shadow:0 12px 28px rgba(15,23,42,.08)}.bl-youtube-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.bl-youtube figcaption{margin-top:.5rem;font-family:var(--bl-font-ui);font-size:.88rem;color:var(--bl-faint);line-height:1.4}.bl-app-rec{display:grid;grid-gap:1.25rem;gap:1.25rem;margin:2rem 0;padding:1.25rem;border-radius:18px;border:1px solid var(--bl-line);background:linear-gradient(135deg,rgba(37,99,235,.06),transparent 45%),var(--bl-surface)}@media (min-width:800px){.bl-app-rec{grid-template-columns:1.3fr .7fr;align-items:center}}.bl-app-rec-kicker{margin:0 0 .25rem;font-size:.78rem;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:#1d4ed8}.bl-app-rec-title{margin:0 0 .45rem;font-size:1.2rem;letter-spacing:-.02em}.bl-app-rec-text{margin:0 0 1rem;color:var(--bl-muted);line-height:1.5}.bl-app-rec-media{display:flex;align-items:flex-end;justify-content:center;gap:.75rem;position:relative;min-height:10rem}.bl-app-rec-icon{border-radius:14px;position:absolute;left:.5rem;top:.5rem;box-shadow:0 8px 18px rgba(15,23,42,.18)}.bl-app-rec-shot{width:auto;height:220px;object-fit:contain;border-radius:18px}.bl-related{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--bl-line)}.bl-related-list{list-style:none;margin:0;padding:0;display:grid;grid-gap:.65rem;gap:.65rem}.bl-related-link{display:flex;flex-direction:column;gap:.2rem;text-decoration:none;padding:.85rem 1rem;border-radius:12px;border:1px solid var(--bl-line);background:var(--bl-surface)}.bl-related-link:hover{border-color:rgba(37,99,235,.3)}.bl-related-cat{font-size:.75rem;font-weight:700;color:#1d4ed8}.bl-related-title{color:var(--bl-ink);font-weight:700}.bl-lesson-nav{display:grid;grid-template-columns:1fr;grid-gap:.75rem;gap:.75rem;margin:2rem 0}@media (min-width:800px){.bl-lesson-nav{grid-template-columns:1fr auto 1fr;align-items:stretch}}.bl-lesson-nav-course,.bl-lesson-nav-link{text-decoration:none;border:1px solid var(--bl-line);border-radius:14px;padding:.9rem 1rem;background:var(--bl-surface);color:inherit}.bl-lesson-nav-link.is-next{text-align:right}.bl-lesson-nav-dir{display:block;font-size:.78rem;font-weight:700;color:var(--bl-faint);margin-bottom:.2rem}.bl-lesson-nav-title{font-weight:700}.bl-lesson-nav-course{display:inline-flex;align-items:center;justify-content:center;font-weight:700;color:#1d4ed8}.bl-faq{margin-top:2.25rem}.bl-faq>h2{margin:0 0 .85rem}.bl-faq details{border:1px solid var(--bl-line);border-radius:14px;background:var(--bl-surface);padding:0;margin:0 0 .55rem;overflow:hidden}.bl-faq summary{cursor:pointer;list-style:none;font-family:var(--bl-font-ui);font-weight:700;padding:.95rem 1rem;display:flex;align-items:center;justify-content:space-between;gap:.75rem;min-height:3.1rem}.bl-faq summary::-webkit-details-marker{display:none}.bl-faq summary:after{content:"";width:1.55rem;height:1.55rem;border-radius:999px;flex-shrink:0;background:#eef2f7 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M12 7v10M7 12h10' stroke='%23475569' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") 50% /.9rem no-repeat}.bl-faq details[open]>summary{border-bottom:1px solid var(--bl-line);background:#f8fafc}.bl-faq details[open]>summary:after{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M7 12h10' stroke='%23475569' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E")}.bl-faq p{margin:0;padding:.85rem 1rem 1rem;color:var(--bl-muted);font-family:var(--bl-font-body)}.bl-course-list{list-style:none;margin:0;padding:0;display:grid;grid-gap:.55rem;gap:.55rem}.bl-course-groups{display:grid;grid-gap:.75rem;gap:.75rem;margin-bottom:2rem}.bl-course-accordion{border:1px solid var(--bl-line);border-radius:18px;background:var(--bl-surface);overflow:hidden}.bl-course-accordion.is-empty{opacity:.78}.bl-course-accordion-summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:auto 1fr auto;grid-gap:.85rem;gap:.85rem;align-items:center;padding:1rem 1.05rem;min-height:4.1rem;-webkit-user-select:none;-moz-user-select:none;user-select:none}.bl-course-accordion-summary::-webkit-details-marker{display:none}.bl-course-accordion[open]>.bl-course-accordion-summary{border-bottom:1px solid var(--bl-line);background:linear-gradient(180deg,#f8fafc,#fff)}.bl-course-block-num{display:inline-flex;align-items:center;justify-content:center;width:2.4rem;height:2.4rem;border-radius:.8rem;background:#eff6ff;color:#1d4ed8;font-weight:800;font-size:.88rem;flex-shrink:0}.bl-course-accordion-copy{min-width:0}.bl-course-accordion-title{margin:0;font-size:1.05rem;letter-spacing:-.02em;font-weight:800;line-height:1.25}.bl-course-accordion-meta{margin:.2rem 0 0;color:var(--bl-faint);font-size:.86rem;line-height:1.35}.bl-course-accordion-chevron{width:1.7rem;height:1.7rem;border-radius:999px;background:#eef2f7;position:relative;flex-shrink:0}.bl-course-accordion-chevron:after,.bl-course-accordion-chevron:before{content:"";position:absolute;inset:50% auto auto 50%;width:.6rem;height:2px;background:#475569;transform:translate(-50%,-50%);border-radius:2px}.bl-course-accordion-chevron:after{transform:translate(-50%,-50%) rotate(90deg)}.bl-course-accordion[open] .bl-course-accordion-chevron:after{opacity:0}.bl-course-accordion-panel{padding:.95rem 1.05rem 1.15rem}.bl-course-group-desc{margin:0 0 .85rem;color:var(--bl-muted);font-size:.95rem;line-height:1.45;max-width:40rem}.bl-course-group-actions{display:flex;flex-wrap:wrap;gap:.55rem .85rem;margin:0 0 .85rem}.bl-course-group-link{font-size:.88rem;font-weight:700;color:#1d4ed8;text-decoration:none}.bl-course-group-link:hover{text-decoration:underline}.bl-course-empty{margin:0;padding:.95rem 1rem;border-radius:14px;background:#f8fafc;border:1px dashed var(--bl-line);color:var(--bl-faint);font-size:.95rem}.bl-course-item{display:grid;grid-template-columns:3.2rem 1fr;grid-gap:.85rem;gap:.85rem;align-items:start;padding:.95rem 1rem;border-radius:14px;border:1px solid var(--bl-line);background:#fbfcfe;text-decoration:none;color:inherit}.bl-course-item:hover{border-color:rgba(37,99,235,.28);background:#fff}.bl-course-num{font-weight:800;color:#1d4ed8}.bl-course-title{margin:0 0 .25rem;font-weight:700}.bl-course-desc{margin:0;color:var(--bl-muted);font-size:.92rem}.bl-empty{padding:1.25rem 1.35rem;border-radius:14px;border:1px dashed var(--bl-line);background:hsla(0,0%,100%,.55);color:var(--bl-muted)}.bl-admin{overflow-x:auto}.bl-admin table{width:100%;border-collapse:collapse;font-size:.88rem;background:var(--bl-surface);border-radius:14px;overflow:hidden}.bl-admin td,.bl-admin th{text-align:left;padding:.7rem .75rem;border-bottom:1px solid var(--bl-line);vertical-align:top}.bl-admin th{background:#0f172a;color:#fff;font-size:.78rem;text-transform:uppercase;letter-spacing:.04em}.bl-status{display:inline-flex;border-radius:999px;padding:.15rem .55rem;font-weight:700;font-size:.75rem;background:#eef2f7}.bl-status--published{background:#d1fae5;color:#065f46}.bl-status--draft,.bl-status--idea,.bl-status--outline{background:#e2e8f0;color:#334155}.bl-status--review{background:#fef3c7;color:#92400e}.bl-status--update{background:#dbeafe;color:#1e40af}@media (max-width:720px){.bl-header-inner{flex-direction:column;align-items:flex-start;gap:.75rem;padding:.9rem 0}.bl-header-actions{width:100%;justify-content:space-between}.bl-nav{width:auto;justify-content:flex-start;gap:.15rem 1.1rem}.bl-search-trigger-label{display:none}.bl-search-page-form{flex-direction:column;align-items:stretch}.bl-cat-row{grid-template-columns:2.1rem minmax(0,1fr);gap:.55rem .75rem}.bl-cat-row-count{grid-column:2;flex-direction:row;align-items:baseline;gap:.35rem;justify-self:start;padding-top:0;font-size:.88rem}.bl-app-rec-shot{height:180px}}@media (max-width:420px){.bl-brand-tag{max-width:11rem}}