.esp-header{box-sizing:border-box;width:100%;max-width:56rem;margin:0 auto;padding:1.25rem 1.25rem .75rem;display:flex;justify-content:space-between;align-items:center}.esp-back{font-size:.7rem;text-transform:uppercase;letter-spacing:.2em;color:var(--muted);text-decoration:none}.esp-back:hover{color:var(--accent)}.esp-article{box-sizing:border-box;width:100%;max-width:46rem;margin:0 auto;padding:.75rem 1rem 4rem}.lesson-progress-rail{box-sizing:border-box;width:100%;display:flex;gap:.45rem;align-items:center;justify-content:space-between;margin:.5rem 0 1rem;padding:.55rem 0 .8rem;border-bottom:1px solid var(--border);overflow-x:auto;scrollbar-width:none}.lesson-progress-rail::-webkit-scrollbar{display:none}.progress-bubble{flex:0 0 auto;width:2.05rem;height:2.05rem;display:grid;place-items:center;border:1px solid var(--border);border-radius:999px;color:var(--muted);background:var(--surface);text-decoration:none;font-size:.78rem;font-weight:600;font-variant-numeric:tabular-nums}.progress-bubble.completed{border-color:color-mix(in srgb,var(--accent) 42%,var(--border));background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent)}.progress-bubble.current{border-color:var(--accent);background:var(--accent);color:var(--bg);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 18%,transparent)}.progress-ellipsis{flex:0 0 auto;color:var(--muted);font-size:1rem;line-height:1;padding:0 .1rem}.lesson-hero{display:grid;grid-template-columns:auto minmax(0,1fr);gap:1rem;align-items:center;margin:1rem 0 1.25rem;padding:1rem;border:1px solid var(--border);border-radius:8px;background:color-mix(in srgb,var(--accent) 6%,var(--surface))}.lesson-hero-copy{min-width:0}.lesson-hero .esp-title-icon{width:3.25rem;height:3.25rem;display:grid;place-items:center;border-radius:8px;background:color-mix(in srgb,var(--accent) 14%,transparent);border:1px solid color-mix(in srgb,var(--accent) 26%,var(--border))}.esp-crumb{font-size:.7rem;text-transform:uppercase;letter-spacing:.16em;color:var(--muted);font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.esp-crumb-dot{margin:0 .45rem}.esp-crumb-num{white-space:nowrap}.esp-title{font-size:2rem;font-weight:600;line-height:1.15;letter-spacing:-.02em;margin:.45rem 0 .35rem;overflow-wrap:anywhere}.esp-title-icon{font-size:1.8rem}.esp-subtitle{color:var(--muted);font-size:1rem;margin:0;line-height:1.4}.esp-prose{display:grid;gap:1rem;max-width:100%;min-width:0;font-size:.97rem;line-height:1.6;overflow-wrap:break-word}.lesson-section,.lesson-details{box-sizing:border-box;width:100%;min-width:0}.lesson-details,.lesson-hook,.lesson-idea,.lesson-concepts,.lesson-takeaways{border:1px solid var(--border);border-radius:8px;background:var(--surface)}.lesson-section{padding:.35rem 0 .15rem}.lesson-hook{padding:1rem;border-left:4px solid var(--accent);background:color-mix(in srgb,var(--accent) 8%,var(--surface))}.lesson-idea{padding:1rem;border-color:color-mix(in srgb,var(--accent) 32%,var(--border))}.lesson-concepts,.lesson-takeaways{padding:1rem;background:var(--surface-soft, var(--surface))}.esp-prose h2{margin:0 0 .65rem;font-size:1.12rem;font-weight:600;letter-spacing:0;border-top:none;padding-top:0}.esp-prose h2:first-of-type{border-top:none;padding-top:0}.lesson-section:not(.lesson-hook):not(.lesson-idea):not(.lesson-concepts):not(.lesson-takeaways) h2{display:flex;align-items:center;gap:.65rem;color:var(--fg)}.lesson-section:not(.lesson-hook):not(.lesson-idea):not(.lesson-concepts):not(.lesson-takeaways) h2:before{content:"";width:.45rem;height:1.55rem;border-radius:999px;background:var(--accent);opacity:.8;flex:0 0 auto}.esp-prose h3{margin:1.1rem 0 .45rem;font-size:1rem;font-weight:600}.esp-prose h4{margin:1.2rem 0 .4rem;font-size:.95rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.esp-prose p{margin:.65rem 0}.esp-prose h2+p,.esp-prose h3+p{margin-top:0}.esp-prose ul,.esp-prose ol{margin:.7rem 0;padding-left:1.35rem}.esp-prose li{margin:.3rem 0}.esp-prose strong{color:var(--fg);font-weight:600}.esp-prose a{color:var(--accent);text-decoration-color:color-mix(in srgb,var(--accent) 45%,transparent);text-underline-offset:.18em}.esp-prose blockquote{margin:1rem 0;padding:.15rem 0 .15rem 1rem;border-left:3px solid var(--accent);color:var(--muted)}.esp-prose code{font-family:var(--font-mono);background:var(--surface);color:var(--fg);padding:.1rem .35rem;border-radius:3px;font-size:.9em}.esp-prose pre{box-sizing:border-box;max-width:100%;contain:inline-size;background:var(--surface-soft, var(--surface))!important;color:var(--fg)!important;border:1px solid var(--border);border-radius:8px;padding:1rem;overflow-x:auto;font-size:.85rem;line-height:1.5;margin:1rem 0}.esp-prose pre code{display:block;width:max-content;min-width:100%;background:none!important;color:inherit!important;padding:0}:root:not([data-theme=dark]) .esp-prose pre.astro-code span{color:var(--fg)!important}.esp-prose table{width:100%;table-layout:fixed;border-collapse:collapse;margin:1rem 0 1.2rem;font-size:.92rem}.esp-prose th,.esp-prose td{border:1px solid var(--border);padding:.55rem .65rem;vertical-align:top;overflow-wrap:anywhere}.esp-prose th{background:var(--surface);font-weight:600;text-align:left}.esp-prose hr{border:0;border-top:1px solid var(--border);margin:2rem 0}.lesson-figure{margin:1.25rem 0;display:grid;gap:.5rem;justify-items:center;text-align:center}.lesson-figure img{display:block;max-width:100%;height:auto}.lesson-figure:not(.brand) img{max-width:14rem;border:1px solid var(--border);border-radius:8px;background:var(--surface)}.lesson-figure figcaption{max-width:34rem;color:var(--muted);font-size:.8rem;line-height:1.45}.logo-wall{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:1.1rem 1.75rem;width:100%;padding:1.25rem 1.5rem;border:1px solid var(--border);border-radius:8px;background:#fff}.logo-wall .brand-logo{height:3rem;width:auto;max-width:9rem;border:none}.concept-grid{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr;gap:0;column-gap:1.5rem}@media(min-width:600px){.concept-grid{grid-template-columns:1fr 1fr}.concept-grid>.concept-card:nth-child(2){border-top:none}}.concept-card{display:block;padding:.5rem 0;border-top:1px solid var(--border);line-height:1.5}.concept-card:first-child{border-top:none}.concept-term{color:var(--accent);font-weight:650}.concept-card:has(.concept-detail) .concept-term:after{content:" — ";color:var(--muted);font-weight:400}.concept-detail{color:var(--muted);font-size:.92rem}.lesson-checklist{list-style:none;padding:0;margin:0}.lesson-checklist li{position:relative;padding:.65rem 0 .65rem 1.75rem;border-top:1px solid var(--border)}.lesson-checklist li:first-child{border-top:none}.lesson-checklist li:before{content:"✓";position:absolute;left:0;top:.65rem;color:var(--accent);font-weight:700}.lesson-details{overflow:clip}.lesson-details summary{cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:.75rem;padding:.95rem 1rem;color:var(--fg)}.lesson-details summary::-webkit-details-marker{display:none}.lesson-details summary:after{content:"＋";color:var(--accent);font-weight:700}.lesson-details[open] summary{border-bottom:1px solid var(--border)}.lesson-details[open] summary:after{content:"−"}.lesson-details-title{font-size:1rem;font-weight:650}.lesson-details-body{padding:.85rem 1rem 1rem}.esp-prose .mermaid{display:grid;place-items:center;background:var(--surface-soft, var(--surface));border:1px solid var(--border);border-radius:8px;padding:1rem;margin:1rem 0;overflow-x:auto;color:var(--fg);min-height:10rem;white-space:normal}.esp-prose .mermaid svg{display:block;width:100%;max-width:42rem;height:auto}.esp-prose .mermaid[data-render-error=true]{display:block;font-family:var(--font-mono);font-size:.78rem;color:var(--muted);white-space:pre}.esp-nav{box-sizing:border-box;width:100%;display:grid;grid-template-columns:1fr 1fr;gap:.75rem;margin-top:1.4rem;padding-top:1.2rem;border-top:1px solid var(--border)}.esp-nav-link{min-width:0;display:flex;gap:.6rem;align-items:center;padding:.85rem 1rem;border:1px solid var(--border);border-radius:8px;text-decoration:none;color:var(--fg);min-height:64px;transition:border-color .1s ease,background .1s ease}.esp-nav-link:hover{border-color:var(--accent);background:var(--surface-soft, var(--surface))}.esp-nav-next{justify-content:flex-end;text-align:right}.esp-nav-arrow{color:var(--muted);font-size:1.1rem}.esp-nav-eyebrow{display:block;font-size:.65rem;text-transform:uppercase;letter-spacing:.16em;color:var(--muted)}.esp-nav-title{display:block;font-size:.85rem;font-weight:500;margin-top:.15rem}@media(max-width:520px){.esp-header{padding:.85rem 1rem .35rem}.esp-article{padding-inline:1rem}.lesson-progress-rail{margin-inline:0}.lesson-hero{align-items:start;padding:.85rem}.lesson-hero .esp-title-icon{width:2.65rem;height:2.65rem;font-size:1.45rem}.esp-title{font-size:1.65rem}.esp-nav{grid-template-columns:1fr}.esp-prose pre{padding:.8rem;font-size:.72rem}.esp-nav-next{justify-content:space-between}}