.concept-lesson{container:lesson-page/inline-size}.lesson-hero{position:relative;isolation:isolate;overflow:hidden;display:grid;grid-template-columns:minmax(0,1fr);gap:.6rem;padding:clamp(1.75rem,6%,3.75rem) clamp(1.25rem,6%,4rem) clamp(2.5rem,7%,4.5rem);border-radius:var(--radius-surface);background:var(--color-forest-950);color:var(--color-paper-50)}.lesson-hero-crumbs{position:relative;z-index:2;display:flex;flex-wrap:wrap;align-items:center;gap:.4rem 1.25rem;color:var(--color-sage-200);font-size:.875rem;font-weight:600}.lesson-hero-crumbs .text-link{color:var(--color-sage-200);text-decoration-color:color-mix(in srgb,var(--color-sage-200) 55%,transparent)}.lesson-hero-crumbs .text-link:hover{color:var(--color-white)}.lesson-hero-title{position:relative;z-index:2;max-width:min(13em,58%);margin:0;font-family:var(--font-display);font-size:clamp(2.1rem,1.4rem + 2.6vw,3.5rem);font-weight:600;letter-spacing:-.02em;line-height:1.04;text-wrap:balance;hyphens:auto;overflow-wrap:break-word}.lesson-hero-art{position:absolute;right:-10px;bottom:-6px;z-index:1;width:min(46%,400px);height:auto}.lesson-hero-sprig{position:absolute;left:-16px;top:-14px;z-index:0;width:150px;height:auto;opacity:.55}@container lesson-page (max-width: 560px){.lesson-hero{padding-bottom:6.25rem}.lesson-hero-title{max-width:none}.lesson-hero-art{width:56%}.lesson-hero-sprig{display:none}}.lesson-book{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);border:1px solid var(--color-line-soft);border-radius:var(--radius-surface);background:var(--color-surface);box-shadow:0 1px 0 rgb(16 43 34/4%),4px 5px 0 var(--color-paper-200),4px 5px 0 1px rgb(106 69 43/12%)}.lesson-book>*{min-width:0;padding:clamp(1.1rem,3.5%,2rem)}.lesson-book-goal{display:grid;align-content:start;gap:1rem;border-right:1px solid var(--color-paper-200)}.lesson-book-label{color:var(--color-earth-700);font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase}.lesson-book-objective{margin:0;color:var(--color-ink-secondary);font-family:var(--font-reading);font-size:1.3rem;font-style:italic;line-height:1.5}.lesson-book-facts{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;margin:0;padding-block:.9rem;border-block:1px solid var(--color-paper-200);color:var(--color-ink-muted);font-size:.82rem;font-weight:600}.lesson-book-facts b{color:var(--color-ink)}.lesson-book-contents ol{display:grid;margin:.4rem 0 0;padding:0;list-style:none}.lesson-book-contents a{display:grid;grid-template-columns:1.8em minmax(0,1fr) auto;align-items:center;gap:.5em;min-height:2.75rem;color:var(--color-ink-secondary);font-size:.93rem}.lesson-book-contents a:hover .lesson-book-title{color:var(--color-forest-800);text-decoration:underline;text-underline-offset:3px}.lesson-book-number{color:var(--color-ink-muted);font-weight:600;font-variant-numeric:tabular-nums}.lesson-book-role{color:var(--color-ink-muted);font-size:.8em;font-weight:600}.lesson-book-lessons{display:grid;grid-column:1/-1;gap:.7rem;border-top:1px solid var(--color-paper-200)}.lesson-book-lessons ol{display:grid;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:.625rem;margin:0;padding:0;list-style:none}.lesson-book-lessons a{display:flex;align-items:center;gap:.7em;min-width:0;min-height:2.75rem;padding:.65em .9em;border:1px solid var(--color-line-soft);border-radius:var(--radius-control);background:var(--color-paper-50);color:var(--color-ink)}.lesson-book-lessons a:hover{border-color:var(--color-sage-500);background:var(--color-sage-100)}.lesson-book-lessons a[aria-current]{border-color:var(--color-sage-500);background:var(--color-surface);box-shadow:inset 0 0 0 1px var(--color-sage-500)}.lesson-book-lessons svg{flex:0 0 auto;width:34px;height:26px}.lesson-book-lessons small{display:block;color:var(--color-ink-muted);font-size:.75rem;font-weight:700}.lesson-book-lessons strong{display:block;overflow:hidden;font-size:.95rem;text-overflow:ellipsis;white-space:nowrap}@container lesson-page (max-width: 720px){.lesson-book{grid-template-columns:minmax(0,1fr)}.lesson-book-goal{border-right:0;border-bottom:1px solid var(--color-paper-200)}}.lesson-next{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:.75rem;margin-top:1rem}.lesson-next a{display:grid;align-content:center;gap:.25em;min-height:2.75rem;padding:1em 1.2em;border:1px solid var(--color-line);border-radius:var(--radius-surface);background:var(--color-surface);color:var(--color-ink)}.lesson-next small{color:var(--color-ink-muted);font-size:.78rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.lesson-next span{color:var(--color-forest-900);font-family:var(--font-display);font-size:1.2rem;font-weight:600;line-height:1.25}.lesson-next a:hover{border-color:var(--color-sage-500);background:var(--color-sage-100)}.lesson-next a[data-primary]{border-color:var(--color-forest-900);background:var(--color-forest-900)}.lesson-next a[data-primary] small{color:var(--color-sage-200)}.lesson-next a[data-primary] span{color:var(--color-white)}.lesson-next a[data-primary]:hover{background:var(--color-forest-950)}@container lesson-page (max-width: 520px){.lesson-next{grid-template-columns:minmax(0,1fr)}}.concept-lesson .learning-section{--sheet-pad:clamp(1.25rem,4cqi,2.5rem);position:relative;padding:var(--sheet-pad);border-inline:1px solid rgb(87 54 32/14%);background:var(--color-surface)}.concept-lesson .learning-section:not(.learning-section+.learning-section){border-top:1px solid rgb(87 54 32/14%);border-start-start-radius:.375rem;border-start-end-radius:.375rem}.concept-lesson .learning-section+.learning-section{margin-top:-2.75rem;padding-top:2.75rem}.concept-lesson .learning-section+.learning-section:after,.concept-lesson .learning-section+.learning-section:before{content:"";position:absolute;top:calc((2.75rem - var(--sheet-pad)) / 2);pointer-events:none}.concept-lesson .learning-section+.learning-section:before{--sheet-rule:rgb(87 54 32/18%);inset-inline:var(--sheet-pad);height:1px;background:linear-gradient(to right,var(--sheet-rule) calc(50% - 2.5rem),transparent calc(50% - 2.5rem) calc(50% + 2.5rem),var(--sheet-rule) calc(50% + 2.5rem))}.concept-lesson .learning-section+.learning-section:after{left:calc(50% - 1.625rem);width:3.25rem;height:1.25rem;translate:0 -50%;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 40 16'%3E%3Cpath d='M3 8h34' stroke='%23356b4a' stroke-width='1.2' stroke-linecap='round'/%3E%3Cpath d='M11 8C12 3 17 1 22 1C21 6 16 8 11 8Z' fill='%237fae83'/%3E%3Cpath d='M21 8C20 13 15 15 10 15C11 10 16 8 21 8Z' fill='%23356b4a'/%3E%3Cpath d='M25 8C26 4 30 2 34 2C33 6 29 8 25 8Z' fill='%237fae83'/%3E%3C/svg%3E") 50% /contain no-repeat}.concept-lesson .learning-section:not(:has(+.learning-section)){border-bottom:1px solid rgb(87 54 32/14%);border-end-start-radius:.375rem;border-end-end-radius:.375rem;box-shadow:0 1px 1px rgb(87 54 32/12%),0 18px 34px -18px rgb(87 54 32/40%)}.concept-lesson .learning-workshop{--learning-card:var(--color-sage-150);border-color:var(--color-sage-200);box-shadow:0 1px 1px rgb(20 56 43/10%),0 10px 24px -6px rgb(20 56 43/18%)}@layer components{.page-container:has(.course-explorer){max-width:1480px}.course-explorer{--forest-bark:#7b5435;--forest-bark-deep:var(--color-earth-800,#573620);--forest-leaf:#a6c38b;--forest-acorn:#caa880;--forest-leather:var(--color-earth-800,#573620);--forest-leather-deep:var(--color-earth-900,#3f2716);--forest-serif:var(--font-display,"Iowan Old Style","Palatino Linotype",Georgia,serif);--forest-italic:var(--font-reading,var(--forest-serif));--explorer-duration:480ms;--motion-reveal:var(--explorer-duration);display:grid;gap:20px;min-width:0;padding-bottom:96px;color:var(--color-ink)}.course-explorer[data-motion=quick]{--explorer-duration:220ms}.course-explorer[data-motion-ready=false],.course-explorer[data-motion=off]{--explorer-duration:0ms}.course-explorer :is(button,a,input,select,summary){-webkit-tap-highlight-color:transparent}.course-explorer :is(button,a,strong,p){overflow-wrap:anywhere}.explorer-controls{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.explorer-controls nav button{min-height:40px;padding-inline:16px}.explorer-search{flex:1 1 300px;position:relative;min-width:0}.explorer-search>svg{position:absolute;left:16px;top:14px;width:18px;height:18px;color:var(--color-ink-muted);pointer-events:none}.explorer-search input{width:100%;padding-left:44px;min-height:48px}.explorer-search-results{position:absolute;top:calc(100% + 8px);left:0;right:0;z-index:12;padding:16px;border-radius:16px;background:var(--color-surface);box-shadow:var(--shadow-overlay)}.explorer-search-results>p{font-size:.875rem;color:var(--color-ink-muted);margin-bottom:12px}.explorer-search-results ul{max-height:min(420px,55vh);overflow:auto;scrollbar-color:var(--color-sage-500) transparent}.explorer-search-results li+li{border-top:1px solid var(--color-line-soft)}.explorer-search-results li :is(a,button){display:grid;gap:4px;width:100%;text-align:left;padding:12px 8px;border-radius:8px}.explorer-search-results small{color:var(--color-ink-muted);font-size:.75rem}.explorer-settings{position:relative}.explorer-settings summary{list-style:none;min-height:48px;display:flex;gap:8px;align-items:center;padding:0 14px;border:1px solid var(--color-line);border-radius:24px;color:var(--color-forest-800);font-weight:700;font-size:.875rem;cursor:pointer}.explorer-settings summary::-webkit-details-marker{display:none}.explorer-settings svg{width:18px;height:18px}.explorer-settings>div{position:absolute;z-index:14;right:0;top:calc(100% + 8px);width:280px;padding:20px;display:grid;gap:12px;background:var(--color-surface);border-radius:16px;box-shadow:var(--shadow-overlay)}.explorer-settings label{font-size:.875rem;font-weight:700}.explorer-sidebar-option{display:flex;gap:10px;align-items:center;min-height:44px}.explorer-sidebar-option input{accent-color:var(--color-forest-800);width:18px;height:18px}.explorer-settings select{min-height:44px;border:1px solid var(--color-line);border-radius:12px;padding:8px 12px;background:var(--color-surface)}.explorer-controls .explorer-collapse{flex-shrink:0;font-size:.875rem}.explorer-surface{min-width:0;border:1px solid var(--color-line-soft);border-radius:16px;background:var(--color-surface)}.explorer-trail{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 24px;min-height:62px;border-bottom:1px solid var(--color-line-soft);font-size:.8125rem}.explorer-trail button{min-height:36px;color:var(--color-forest-800);text-align:left}.explorer-trail>span{color:var(--color-ink-muted)}.explorer-trail strong{font-weight:700}.explorer-body{display:grid;grid-template-columns:minmax(0,1fr)}.explorer-body[data-sidebar=true]{grid-template-columns:minmax(0,1fr) 340px}.explorer-body[data-view=map] .explorer-detail{border-left:0;padding:24px 24px 24px 0}.explorer-body[data-view=map] .explorer-detail-inner{position:sticky;top:16px;border:1px solid var(--color-line);border-radius:20px;background:var(--color-paper-50)}.explorer-detail{min-width:0;border-left:1px solid var(--color-line-soft)}.explorer-detail-inner{display:grid;gap:20px;padding:24px}.explorer-detail-context{display:flex;justify-content:space-between;gap:12px;font-size:.75rem;color:var(--color-ink-muted)}.explorer-detail-context span:first-child{color:var(--color-forest-800);font-weight:700}.explorer-detail-context span:last-child{color:var(--forest-bark);font-weight:700;letter-spacing:.06em;text-transform:uppercase}.explorer-detail h2{font-family:var(--forest-serif);font-size:1.5rem;font-weight:700;line-height:1.2}.explorer-detail :is(p,h3){font-size:.875rem;line-height:1.65}.explorer-detail p{color:var(--color-ink-secondary)}.explorer-detail h3{font-weight:700}.explorer-lesson-rows{list-style:none;margin:0;padding:0}.explorer-lesson-rows li+li{border-top:1px solid var(--color-line-soft)}.explorer-lesson-rows a{display:grid;grid-template-columns:22px minmax(0,1fr) 16px;gap:10px;align-items:center;padding:14px 8px 14px 4px;width:100%;text-align:left;border-radius:8px;transition:background-color .16s var(--ease-feedback)}.explorer-lesson-rows strong{display:block;font-size:.9375rem;line-height:1.45;font-weight:700;color:var(--color-forest-950)}.explorer-lesson-rows small{display:block;margin-top:3px;color:var(--color-ink-muted);font-size:.8125rem;line-height:1.5}.explorer-lesson-rows svg{width:16px;height:16px;color:var(--color-forest-800);transition:transform .16s var(--ease-feedback)}.explorer-sequence{color:var(--color-ink-muted);font-size:.75rem;font-variant-numeric:tabular-nums}.explorer-concept-link{min-height:36px;text-align:left;color:var(--color-forest-800);font-size:.8125rem;text-decoration:underline;text-underline-offset:4px}.explorer-relations{border-top:1px solid var(--color-line-soft);padding-top:20px;font-size:.8125rem}.explorer-relations h3{font-size:.8125rem;font-weight:700;margin-bottom:8px}.explorer-relations li{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 8px}.explorer-relations span{color:var(--color-ink-muted);font-size:.75rem}.explorer-relations button{color:var(--color-forest-800);min-height:36px;text-decoration:underline;text-underline-offset:4px;text-align:left}.explorer-empty{color:var(--color-ink-muted);font-size:.875rem;line-height:1.65;padding-block:8px 24px}@media (hover:hover){.explorer-lesson-rows a:hover,.explorer-search-results li :is(a,button):hover{background:var(--color-sage-100)}.explorer-lesson-rows a:hover svg{transform:translateX(3px)}.explorer-settings summary:hover{color:var(--color-sage-700)}.explorer-trail button:hover{text-decoration:underline;text-underline-offset:4px}}.course-explorer[data-compact=true] .explorer-collapse{display:none}@media (max-width:645px){.course-explorer{gap:16px}.explorer-controls{gap:10px}.explorer-search{flex-basis:100%;order:3}.explorer-settings{margin-left:auto}.explorer-settings summary{padding-inline:12px}.explorer-settings summary span{display:none}.explorer-settings summary:after{content:"Val"}.explorer-controls nav button{padding-inline:12px}.explorer-controls .explorer-collapse{font-size:.75rem;padding-inline:8px}.explorer-trail{padding:10px 16px;gap:6px;font-size:.75rem}}@media (prefers-reduced-motion:reduce){.course-explorer{--explorer-duration:0ms!important}}}@layer components{.explorer-tree{min-width:0;display:grid;gap:24px;padding:24px;container-type:inline-size}.forest-crowns{display:grid;grid-template-columns:repeat(auto-fit,minmax(132px,1fr));gap:8px}.forest-crowns .explorer-node{display:flex;flex-direction:column;align-items:center;gap:4px;min-height:44px;padding:12px 8px;text-align:center;border:1px solid var(--color-line);border-radius:16px;background:var(--color-surface);color:var(--color-forest-950);transition:background-color .16s var(--ease-feedback),border-color .16s var(--ease-feedback)}.forest-crowns .explorer-node>svg:last-child{display:none}.forest-crown-icon{color:var(--forest-leaf);margin-bottom:2px}.forest-crowns strong{font-size:.8125rem;line-height:1.3;font-weight:700}.forest-crowns small{font-size:.75rem;color:var(--color-ink-muted)}.forest-crowns .explorer-node[data-selected=true]{background:var(--color-forest-800);border-color:var(--color-forest-800);color:white}.forest-crowns .explorer-node[data-selected=true] small{color:var(--color-sage-200)}.forest-hint{justify-self:center;padding:32px 0 16px;color:var(--color-ink-secondary);font-family:var(--forest-italic);font-style:italic;text-align:center}.forest-trunk{display:flex;flex-direction:column;min-width:0}.forest-plaque{align-self:center;position:relative;z-index:1;padding:8px 20px;border-radius:10px;text-align:center;background:var(--forest-bark);color:#fbf3e3;box-shadow:0 3px 0 var(--forest-bark-deep);font-family:var(--forest-serif);font-size:1.125rem;font-weight:700}.forest-plaque small{display:block;font-family:var(--font-sans);font-size:.75rem;font-weight:500;opacity:.85}.forest-plaque:focus-visible{outline-offset:4px}.forest-branches{position:relative;display:grid;gap:6px;padding:14px 0 6px;list-style:none;margin:0}.forest-branches:before{content:"";position:absolute;top:0;bottom:0;left:calc(50% - 4px);width:8px;border-radius:6px;background:var(--forest-bark)}.forest-branch{display:grid;grid-template-columns:minmax(0,1fr) 56px minmax(0,1fr);align-items:start}.forest-twig{grid-row:1;grid-column:2;width:56px;height:40px;color:var(--forest-bark)}.forest-twig-leaf{fill:var(--forest-leaf)}.forest-leaf{grid-row:1;display:grid;gap:10px;min-width:0;padding:12px 16px;background:var(--color-surface);border:1.5px solid var(--forest-leaf);transition:background-color var(--explorer-duration) var(--ease-feedback),border-color var(--explorer-duration) var(--ease-feedback)}.forest-branch[data-side=right] .forest-leaf{grid-column:3;border-radius:6px 26px 6px 26px}.forest-branch[data-side=left] .forest-leaf{grid-column:1;border-radius:26px 6px 26px 6px}.forest-leaf .explorer-node{display:grid;gap:2px;min-height:40px;color:var(--color-forest-950)}.forest-leaf .explorer-node>svg:last-child{display:none}.forest-leaf .explorer-node strong{font-size:.9375rem;line-height:1.35;font-weight:700}.forest-leaf .explorer-node small{display:flex;align-items:center;gap:6px;font-size:.75rem;color:var(--color-ink-muted)}.forest-acorns{display:inline-flex;gap:3px}.forest-acorns i{display:block;width:7px;height:9px;border-radius:50% 50% 45% 45%;background:var(--forest-acorn)}.forest-branch[data-selected=true] .forest-leaf{background:var(--color-forest-800);border-color:var(--color-forest-800)}.forest-branch[data-selected=true] .forest-leaf .explorer-node{color:white}.forest-lessons{display:grid;gap:10px}.forest-lessons ul{display:grid;gap:4px;list-style:none;margin:0;padding:0}.forest-lessons .lesson-node{display:grid;grid-template-columns:14px minmax(0,1fr) 14px;gap:10px;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:10px;text-align:left;font-size:.875rem;color:white;background:rgb(255 255 255/8%);transition:background-color .16s var(--ease-feedback)}.forest-lessons .lesson-node svg{width:14px;height:14px;opacity:.7;transition:transform .16s var(--ease-feedback)}.forest-acorn{position:relative;width:11px;height:14px;border-radius:50% 50% 45% 45%;background:var(--forest-acorn)}.forest-acorn:before{content:"";position:absolute;top:-1px;left:-1px;right:-1px;height:6px;border-radius:6px 6px 2px 2px;background:var(--forest-bark)}.forest-lessons-empty{color:var(--color-sage-200);font-size:.8125rem}.forest-inline{display:grid;gap:16px;padding:16px;border-radius:14px;background:var(--color-paper-50);color:var(--color-ink)}.forest-roots{align-self:center;margin-top:-2px;color:var(--forest-bark)}@media (hover:hover){.forest-crowns .explorer-node:not([data-selected=true]):hover{background:var(--color-sage-100);border-color:var(--color-sage-500)}.forest-branch:not([data-selected=true]) .forest-leaf:hover{background:var(--color-sage-100)}.forest-lessons .lesson-node:hover{background:rgb(255 255 255/16%)}.forest-lessons .lesson-node:hover svg{transform:translateX(3px);opacity:1}}@container (max-width: 619px){.forest-branches:before{left:14px}.forest-branch{grid-template-columns:36px minmax(0,1fr)}.forest-branch[data-side] .forest-leaf{grid-column:2;position:relative;border-radius:6px 26px 6px 26px}.forest-branch .forest-leaf:before{content:"";position:absolute;left:-22px;top:22px;width:22px;height:4px;border-radius:3px;background:var(--forest-bark)}.forest-twig{display:none}.forest-plaque,.forest-roots{align-self:flex-start}.forest-roots{margin-left:-46px}}}@layer components{.explorer-body[data-view=list]{position:relative;margin:16px;padding:14px;border-radius:18px;background:radial-gradient(120% 90% at 30% 15%,color-mix(in srgb,var(--color-earth-700) 88%,white) 0,var(--forest-leather) 48%,var(--forest-leather-deep) 100%);box-shadow:inset 0 1px 0 rgb(255 230 200/14%),0 18px 36px -20px rgb(0 0 0/55%)}.explorer-body[data-view=list]:after{content:"";position:absolute;inset:6px;border:1.5px dashed rgb(234 206 170/42%);border-radius:13px;pointer-events:none}.explorer-body[data-view=list][data-sidebar=true]{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.book-page{position:relative;z-index:1;min-width:0;padding:32px 36px 40px;border-radius:10px;background:var(--color-paper-50)}.explorer-body[data-sidebar=true] .book-page{border-radius:10px 3px 3px 10px;background-image:linear-gradient(270deg,rgb(106 69 43/13%),transparent 1.75rem)}.explorer-body[data-view=list] .explorer-detail{position:relative;z-index:1;border-left:0;border-radius:3px 10px 10px 3px;background:var(--color-paper-50) linear-gradient(to right,rgb(106 69 43/15%),transparent 1.75rem)}.explorer-body[data-view=list] .explorer-detail:before{content:"";position:absolute;top:-14px;right:40px;width:18px;height:84px;background:linear-gradient(90deg,var(--color-forest-800),var(--color-sage-700) 50%,var(--color-forest-800));clip-path:polygon(0 0,100% 0,100% 100%,50% 82%,0 100%)}.explorer-body[data-view=list] .explorer-detail-inner{position:sticky;top:0;padding:36px 40px 40px}.explorer-body[data-view=list] .explorer-detail-context{padding-right:48px}.book-blank{display:grid;place-items:center;padding:40px}.book-blank p{max-width:26ch;text-align:center;color:var(--color-ink-muted);font-family:var(--forest-italic);font-style:italic;line-height:1.6}.book-title{font-family:var(--forest-serif);font-size:1.5rem;font-weight:700}.book-subtitle{margin:2px 0 18px;font-family:var(--forest-italic);font-style:italic;color:var(--color-ink-muted);font-size:.875rem}.explorer-list-area{border-top:1px solid var(--color-line)}.explorer-list-area:last-child{border-bottom:1px solid var(--color-line)}.explorer-list-area>h2>button{display:grid;grid-template-columns:52px minmax(0,1fr) auto;gap:10px;align-items:baseline;width:100%;min-height:52px;padding:14px 2px;text-align:left}.book-roman{color:var(--forest-bark)}.book-part-title,.book-roman{font-family:var(--forest-serif);font-weight:700}.book-part-title{font-size:1.1875rem;color:var(--color-forest-950)}.explorer-list-area[data-open=true] .book-part-title{color:var(--color-forest-800)}.book-part-count{display:flex;align-items:center;gap:10px;font-size:.75rem;color:var(--color-ink-muted);font-variant-numeric:tabular-nums}.book-part-count svg{width:16px;height:16px;transition:transform var(--explorer-duration) var(--ease-feedback)}.book-part-count svg[data-open=true]{transform:rotate(180deg)}.explorer-list-concepts{list-style:none;margin:0 0 16px 22px;padding:0 0 0 18px;border-left:2px solid var(--forest-leaf)}.explorer-list-concept h3 button{position:relative;display:flex;align-items:baseline;gap:8px;width:100%;min-height:44px;padding:10px 0;text-align:left}.explorer-list-concept h3 button:before{content:"";position:absolute;left:-25px;top:18px;width:10px;height:10px;border-radius:0 8px 0 8px;background:var(--color-paper-50);border:2px solid var(--forest-leaf)}.explorer-list-concept[data-selected=true] h3 button:before{background:var(--color-sage-700);border-color:var(--color-sage-700)}.explorer-list-concept h3 strong{font-family:var(--forest-serif);font-size:1rem;font-weight:500;color:var(--color-ink)}.explorer-list-concept[data-selected=true] h3 strong{font-weight:700;color:var(--color-forest-800)}.book-leader{flex:1;min-width:16px;border-bottom:1.5px dotted var(--forest-acorn);transform:translateY(-4px)}.explorer-list-concept h3 small{flex-shrink:0;font-size:.75rem;color:var(--color-ink-muted);font-variant-numeric:tabular-nums}.explorer-list-expanded{margin:2px 0 10px}.book-lessons{display:grid;gap:2px;list-style:none;margin:0;padding:0 0 0 16px}.book-lessons a{display:grid;grid-template-columns:44px minmax(0,1fr) 14px;gap:8px;align-items:center;width:100%;min-height:40px;padding:8px 10px;border-radius:8px;text-align:left;transition:background-color .16s var(--ease-feedback)}.book-lessons strong{font-size:.875rem;font-weight:600}.book-lessons svg{width:14px;height:14px;color:var(--color-forest-800);opacity:0;transition:opacity .16s var(--ease-feedback),transform .16s var(--ease-feedback)}.book-lessons a:focus-visible svg{opacity:1}.book-number{font-size:.75rem;color:var(--forest-bark);font-variant-numeric:tabular-nums}.book-empty{padding:4px 0 8px 16px;color:var(--color-ink-muted);font-size:.8125rem}.book-inline{display:grid;gap:16px;margin-top:12px;padding:4px 16px 16px;border:1px solid var(--color-line);border-radius:12px;background:var(--color-surface)}@media (hover:hover){.explorer-list-area>h2>button:hover .book-part-title,.explorer-list-concept h3 button:hover strong{color:var(--color-sage-700)}.book-lessons a:hover{background:var(--color-sage-100)}.book-lessons a:hover svg{opacity:1;transform:translateX(3px)}}@media (max-width:860px){.explorer-body[data-view=list]{margin:10px;padding:10px}.book-page{padding:24px 20px 28px}.explorer-list-area>h2>button{grid-template-columns:36px minmax(0,1fr) auto}.explorer-list-concepts{margin-left:8px;padding-left:14px}.explorer-list-concept h3 button:before{left:-21px}}}@layer components{.explorer-path{display:grid;gap:20px;min-width:0}.path-trail{display:grid;gap:4px;list-style:none;margin:0;padding:0}.path-stone{display:flex;align-items:center;gap:10px;width:100%;min-height:48px;padding:6px 14px 6px 6px;border:1px solid transparent;border-radius:999px;text-align:left}.path-stone i{display:grid;place-items:center;flex:none;width:32px;height:32px;border-radius:50%;font-style:normal;font-weight:700;font-size:.8125rem;background:var(--color-sage-100);color:var(--color-sage-700);border:2px solid var(--forest-leaf)}.path-stone span{display:grid;min-width:0;line-height:1.25}.path-stone small{font-size:.6875rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--color-ink-muted)}.path-stone b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.875rem}.path-stone[aria-current=step]{border-color:var(--color-line);background:var(--color-surface)}.path-stone[aria-current=step] i{background:var(--color-forest-800);border-color:var(--color-forest-800);color:white}.path-stone:disabled{opacity:.45;cursor:default}.path-trail li+li{position:relative}.path-trail li+li:before{content:"";position:absolute;left:21px;top:-6px;height:8px;border-left:2px dashed var(--forest-acorn)}.path-stage{animation:path-in var(--explorer-duration) var(--ease-feedback)}@keyframes path-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}.path-lead{display:grid;gap:6px;margin-bottom:16px}.path-lead h2{font-size:1.5rem;font-weight:700;line-height:1.2}.path-lead h2,.path-lead p{font-family:var(--forest-serif)}.path-lead p{font-size:.9375rem;line-height:1.6;color:var(--color-ink-secondary)}.path-cards{display:grid;gap:12px}.path-card{position:relative;overflow:hidden;display:grid;gap:8px;padding:18px 18px 52px;border:1px solid var(--color-line);border-radius:20px;background:var(--color-surface);text-align:left}.path-card-icon{display:grid;place-items:center;width:44px;height:44px;border-radius:14px;background:var(--color-sage-100)}.path-card-icon svg{width:30px;height:26px}.path-card strong{font-family:var(--forest-serif);font-size:1.125rem;font-weight:700;line-height:1.25;color:var(--color-forest-950)}.path-card-text{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;font-size:.8125rem;line-height:1.55;color:var(--color-ink-secondary)}.path-card small{position:absolute;z-index:1;left:18px;bottom:16px;display:flex;align-items:center;gap:6px;font-size:.75rem;font-weight:700;color:var(--color-forest-800)}.path-hill{position:absolute;right:-30px;bottom:-44px;width:170px;height:88px;border-radius:50%;background:var(--color-sage-100);pointer-events:none}.path-notebook{position:relative;min-width:0;padding:20px 16px 20px 46px;border:1px solid var(--color-line);border-radius:16px;background-color:var(--color-paper-50);background-image:linear-gradient(rgb(52 104 138/12%) 1px,transparent 0),linear-gradient(90deg,rgb(52 104 138/12%) 1px,transparent 0);background-size:22px 22px}.path-notebook:before{content:"";position:absolute;top:0;bottom:0;left:32px;width:2px;background:rgb(211 134 118/70%)}.path-holes{position:absolute;left:9px;top:40px;bottom:40px;display:flex;flex-direction:column;justify-content:space-around}.path-holes i{width:11px;height:11px;border-radius:50%;background:var(--color-paper-200);box-shadow:inset 0 1px 2px rgb(60 45 25/25%)}.path-notebook-title{margin-bottom:8px;font-family:var(--forest-serif);font-size:1.0625rem;font-weight:700;color:var(--color-forest-950)}.path-lessons{display:grid;list-style:none;margin:0;padding:0}.path-lessons li+li{border-top:1px dashed rgb(52 104 138/22%)}.path-lessons a{display:grid;grid-template-columns:minmax(0,1fr) 16px;column-gap:10px;align-items:center;min-height:56px;padding:12px 4px}.path-lessons a>:not(svg){grid-column:1}.path-lessons svg{grid-column:2;grid-row:1/span 3;width:16px;height:16px;color:var(--color-forest-800)}.path-lesson-number{font-size:.6875rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--forest-bark)}.path-lessons strong{font-size:.9375rem;line-height:1.4;color:var(--color-forest-950)}.path-lessons small{margin-top:2px;font-size:.8125rem;line-height:1.5;color:var(--color-ink-secondary)}.path-extras{display:grid;gap:12px;margin-top:16px}@media (prefers-reduced-motion:reduce){.path-stage{animation:none}}}