.subject-labels{position:absolute;inset:0;pointer-events:none}.subject-caption{position:absolute;display:inline-flex;align-items:baseline;gap:6px;padding:0 0 1px;border:0;border-bottom:1px solid var(--fg-edge);background:none;color:var(--muted);font-family:var(--font-body);font-size:11px;line-height:1;letter-spacing:.08em;text-transform:uppercase;white-space:nowrap;pointer-events:auto;cursor:pointer}.subject-caption:hover{color:var(--fg);border-bottom-color:var(--accent-edge)}.subject-caption:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.subject-caption[data-done=true]{color:var(--accent-strong);border-bottom-color:var(--accent-edge)}.route-menu{position:relative}.route-menu .btn{white-space:nowrap}.route-menu-panel{position:absolute;top:calc(100% + 6px);right:0;z-index:40;min-width:280px;max-width:360px;padding:6px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);box-shadow:0 10px 30px var(--shadow)}.route-menu-panel[hidden]{display:none}.route-menu-panel ul{margin:0;padding:0;list-style:none}.route-row{display:block;width:100%;padding:7px 8px;border:0;border-radius:calc(var(--radius) - 2px);background:none;color:var(--fg);font-family:var(--font-body);text-align:left;cursor:pointer}.route-row:hover{background:var(--accent-soft)}.route-row:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.route-row[data-state=done] .route-label,.route-row[aria-disabled=true] .route-label{color:var(--muted)}.route-row[aria-disabled=true]{cursor:default}.route-row[aria-disabled=true]:hover{background:none}.route-label{display:block;font-weight:500}.route-meta{display:block;color:var(--muted)}:root{--bg: #ffffff;--surface: #f7f8fa;--fg: #111111;--muted: #6b7280;--border: #d9dee7;--accent: #1677ff;--accent-soft: color-mix(in oklch, var(--accent) 12%, transparent);--accent-strong: color-mix(in oklch, var(--accent) 84%, black);--accent-edge: color-mix(in oklch, var(--accent) 42%, transparent);--fg-soft: color-mix(in oklch, var(--fg) 5%, transparent);--fg-edge: color-mix(in oklch, var(--fg) 14%, transparent);--muted-strong: color-mix(in oklch, var(--fg) 12%, var(--muted));--shadow: color-mix(in oklch, var(--fg) 16%, transparent);--scrim: color-mix(in oklch, var(--fg) 52%, transparent);--grid: color-mix(in oklch, var(--border) 85%, transparent);--font-display: "Inter", system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;--font-body: "Inter", system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;--font-mono: ui-monospace, "SF Mono", Menlo, monospace;--fs-body: 16px;--fs-meta: 13px;--gap-xs: 8px;--gap-sm: 12px;--gap-md: 20px;--gap-lg: 32px;--gap-xl: 56px;--radius: 8px;--nav-h: 64px}*,*:before,*:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}svg{display:block}button{font:inherit;color:inherit;cursor:pointer}p{text-wrap:pretty;margin:0}h1,h2,h3,h4{text-wrap:balance;margin:0;font-family:var(--font-display)}ul,ol{margin:0;padding:0}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}a{color:var(--accent-strong)}.h1{font-size:clamp(28px,2.5vw,36px);line-height:1.1;letter-spacing:-.024em;font-weight:600}.h2{font-size:21px;line-height:1.2;letter-spacing:-.016em;font-weight:600}.h3{font-size:15px;line-height:1.3;font-weight:600;letter-spacing:-.008em}.lead{font-size:15px;line-height:1.58;color:var(--muted)}.eyebrow{font-family:var(--font-mono);font-size:11px;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}.meta{font-family:var(--font-mono);font-size:var(--fs-meta);color:var(--muted)}.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.topnav{position:sticky;top:0;z-index:40;background:color-mix(in oklch,var(--bg) 94%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.topnav-inner{display:flex;flex-wrap:wrap;align-items:center;column-gap:18px;row-gap:8px;padding:11px 22px;min-height:var(--nav-h)}.brand{display:flex;align-items:baseline;gap:9px;min-width:0;flex:1 1 auto;background:none;border:0;padding:0;text-align:left}.brand .logo{font-family:var(--font-display);font-size:16.5px;font-weight:600;letter-spacing:-.015em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand .sub{font-family:var(--font-mono);font-size:11px;color:var(--muted);white-space:nowrap;flex:none}.brand:hover .logo{color:var(--accent-strong)}.crumbs{display:flex;align-items:center;gap:9px;min-width:0;flex:0 1 auto;font-family:var(--font-mono);font-size:11px;color:var(--muted)}.crumbs[hidden]{display:none}.crumbs .cn{padding:3px 7px;border-radius:5px;background:var(--fg);color:var(--bg);font-variant-numeric:tabular-nums}.crumbs .ct{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:30ch;color:var(--fg)}.crumbs .cs:before{content:"/"}.nav-right{display:flex;align-items:center;gap:12px;margin-left:auto;flex:0 1 auto;min-width:0}#about-btn{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:34vw}.meter{display:flex;align-items:center;gap:10px;padding:5px 12px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}.meter .xp{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:13px;font-weight:600;color:var(--fg);letter-spacing:-.02em}.meter .xp em{font-style:normal;color:var(--muted-strong);font-weight:400}.meter .bar{position:relative;width:96px;height:5px;background:var(--border);border-radius:999px;overflow:hidden}.meter .bar i{position:absolute;inset:0 auto 0 0;background:var(--accent);border-radius:999px;transition:width .35s ease}.chip{display:inline-flex;align-items:center;gap:7px;min-height:40px;padding:0 12px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;text-transform:uppercase;color:var(--fg);transition:background .15s ease,border-color .15s ease;cursor:pointer}.chip:hover{background:var(--fg-soft);border-color:var(--muted)}.chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.chip .dot{width:6px;height:6px;border-radius:999px;background:var(--accent);flex:none}.chip .n{font-size:13px;font-weight:600;letter-spacing:-.02em}.seg{display:flex;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.seg button{background:var(--bg);border:0;padding:0 13px;min-height:40px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--muted);transition:background .15s ease,color .15s ease}.seg button+button{border-left:1px solid var(--border)}.seg button:hover{background:var(--fg-soft);color:var(--fg)}.seg button[aria-pressed=true]{background:var(--fg);color:var(--bg)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 17px;min-height:44px;border-radius:var(--radius);border:1px solid transparent;font-size:15px;font-weight:500;letter-spacing:-.005em;transition:background .15s ease,border-color .15s ease,color .15s ease}.btn-primary{background:var(--accent-strong);color:var(--bg);border-color:var(--accent-strong)}.btn-primary:hover{background:color-mix(in oklch,var(--accent-strong) 84%,black);border-color:color-mix(in oklch,var(--accent-strong) 84%,black);color:var(--bg)}.btn-secondary{background:var(--bg);color:var(--fg);border-color:var(--border)}.btn-secondary:hover{border-color:var(--fg);background:var(--surface);color:var(--fg)}.btn-ghost{background:transparent;color:var(--fg);border-color:transparent;padding-inline:10px;min-height:40px;font-size:14px}.btn-ghost:hover{color:var(--accent-strong);background:var(--fg-soft)}.btn[disabled]{background:var(--surface);color:var(--muted);border-color:var(--border);cursor:not-allowed}.btn-sm{padding:8px 13px;min-height:40px;font-size:13.5px}.btn-block{width:100%}.arrow:after{content:"→"}.arrow-l:before{content:"←"}.stage{position:relative;display:flex;flex-direction:column;height:calc(100vh - var(--nav-h));min-height:560px;overflow:hidden}.canvas-wrap{position:relative;flex:1 1 auto;min-height:260px;background:var(--bg)}.canvas{position:absolute;inset:0;overflow:hidden;cursor:grab;touch-action:none;background-image:radial-gradient(var(--grid) 1px,transparent 1px);background-size:26px 26px}.canvas.dragging{cursor:grabbing}.world{position:absolute;left:0;top:0;transform-origin:0 0}.edges{position:absolute;left:0;top:0;overflow:visible;pointer-events:none}.edges path{fill:none;stroke-width:1.6;stroke-linecap:round;transition:stroke .3s ease,stroke-width .3s ease}.edges path[data-state=locked]{stroke:var(--border);stroke-width:1.4;stroke-dasharray:2 7}.edges path[data-state=open]{stroke:var(--muted)}.edges path[data-state=done]{stroke:var(--fg);stroke-width:2.2}.edges path[data-extra=true]{opacity:.62}.edges path[data-next=true]{stroke:var(--accent);stroke-width:2;stroke-dasharray:3 7;opacity:1;animation:walk .9s linear infinite}.edges path[data-ignite=true]{stroke:var(--fg);stroke-width:2.2;animation:ink .62s cubic-bezier(.2,.7,.2,1) both}@keyframes walk{to{stroke-dashoffset:-10}}@keyframes ink{0%{opacity:0}to{opacity:1}}.canvas-tools{position:absolute;right:20px;bottom:20px;display:flex;flex-direction:column;align-items:flex-end;gap:10px}.zoom{display:flex;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--border);box-shadow:0 10px 24px -20px var(--shadow)}.zoom button{display:flex;align-items:center;justify-content:center;width:44px;height:44px;background:var(--bg);border:0;color:var(--fg)}.zoom button+button{border-left:1px solid var(--border)}.zoom svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.zoom button:hover{background:var(--fg-soft);color:var(--fg)}.minimap{width:186px;height:116px;border:1px solid var(--border);border-radius:var(--radius);background:color-mix(in oklch,var(--bg) 90%,transparent);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);box-shadow:0 10px 24px -20px var(--shadow);cursor:pointer;touch-action:none}.minimap rect.mn{fill:var(--fg-edge);stroke:var(--fg-edge)}.minimap rect.mn[data-state=locked]{fill:transparent;stroke:var(--border);stroke-dasharray:2 3}.minimap rect.mn[data-state=available]{fill:var(--muted);stroke:var(--muted)}.minimap rect.mn[data-state=done]{fill:var(--fg);stroke:var(--fg)}.minimap rect.mn[data-state=active]{fill:var(--accent);stroke:var(--fg)}.minimap rect.mb{fill:var(--accent-strong)}.minimap rect.vp{fill:color-mix(in oklch,var(--fg) 8%,transparent);stroke:var(--fg);stroke-width:1.4}.hint-strip{position:absolute;left:22px;bottom:24px;font-family:var(--font-mono);font-size:11px;color:var(--muted);pointer-events:none}.nodes{position:absolute;inset:0}.nodes[data-lod=far] .node-sub,.nodes[data-lod=far] .blockmap{display:none}.nodes[data-lod=far] .node-bar{display:block}.node{position:absolute;display:flex;flex-direction:column;gap:6px;padding:12px 14px;text-align:left;background:var(--surface);color:var(--fg);border:1px solid var(--border);border-radius:var(--radius);transition:border-color .15s ease,box-shadow .15s ease,background .15s ease}.node:hover{border-color:var(--fg);box-shadow:0 12px 26px -20px var(--shadow)}.node-line{display:flex;align-items:center;justify-content:space-between;gap:8px}.node-tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.node-idx{font-family:var(--font-mono);font-size:11px;line-height:1;padding:3px 6px;border-radius:5px;background:var(--fg-soft);color:var(--muted-strong)}.node-title{font-size:14px;font-weight:600;line-height:1.22;letter-spacing:-.008em}.node-sub{font-family:var(--font-mono);font-size:11px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.node-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:8px;font-family:var(--font-mono);font-size:11px;color:var(--muted)}.node-open{position:absolute;inset:0;z-index:0;background:none;border:0;border-radius:var(--radius)}.blockmap{position:relative;z-index:2;display:flex;gap:4px}.pip{width:20px;height:8px;padding:0;border-radius:4px;border:1px solid var(--border);background:var(--border);transition:box-shadow .15s ease,background .15s ease}.pip[data-kind=film]{border-radius:999px}.pip[data-kind=tree]{background:transparent;border-style:dashed}.pip[data-kind=options]{border-radius:2px;background:transparent;border-style:dotted}.pip[data-kind=game]{border-radius:999px;border-color:var(--fg)}.pip[data-s=done][data-kind=explain]{background:var(--muted);border-color:var(--muted)}.pip[data-s=done][data-kind=film]{background:var(--fg);border-color:var(--fg)}.pip[data-s=done][data-kind=math],.pip[data-s=done][data-kind=tree]{background:var(--accent-strong);border-color:var(--accent-strong)}.pip[data-s=done][data-kind=check],.pip[data-s=done][data-kind=game]{background:var(--accent);border-color:var(--accent)}.pip[data-s=cur]{box-shadow:0 0 0 2px var(--accent-soft);border-color:var(--fg)}.pip:hover{box-shadow:0 0 0 2px var(--fg-soft)}.pip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.blockmap .pip:after{content:"";position:absolute;left:50%;top:50%;width:24px;height:24px;margin:-12px 0 0 -12px}.node-bar{display:none;height:4px;border-radius:999px;background:var(--border);overflow:hidden}.node-bar i{display:block;height:100%;background:var(--accent-strong)}.node[data-extra=true]{border-style:dashed}.node[data-extra=true] .node-title{font-size:13px}.node[data-bonus=true]{border-style:dashed;border-color:var(--fg-edge)}.node[data-state=locked]{background:transparent}.node[data-state=locked] .node-title{color:var(--muted)}.node[data-state=available]{background:var(--bg);border-color:var(--fg)}.node[data-state=available] .node-idx{background:var(--accent-strong);color:var(--bg)}.node[data-state=available] .node-foot .xp{color:var(--accent-strong)}.node[data-state=done]{background:var(--fg-soft);border-color:var(--fg-edge)}.node[data-state=done] .node-idx{background:var(--fg);color:var(--bg)}.node[data-state=done] .node-foot .xp,.node[data-state=done] .node-tag,.node[data-state=done] .node-sub,.node[data-state=done] .node-foot{color:var(--muted-strong)}.node.is-active{border-color:var(--accent-strong);box-shadow:0 0 0 3px var(--accent-soft)}.node[data-next=true]:after{content:"";position:absolute;inset:-5px;border-radius:12px;border:2px solid var(--accent-strong);opacity:0;animation:ring 2.8s ease-in-out infinite;pointer-events:none}.node[data-ignite=true]{animation:lift .62s cubic-bezier(.2,.7,.2,1) both}@keyframes lift{0%{transform:translateY(5px)}40%{transform:translateY(0);box-shadow:0 0 0 7px var(--accent-soft)}to{box-shadow:0 0 0 0 transparent}}@keyframes ring{0%,70%,to{opacity:0;transform:scale(1)}25%{opacity:.5;transform:scale(1.006)}}.panel{position:absolute;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius)}.panel[data-mode=overview]{position:relative;flex:none;border:0;border-top:1px solid var(--border);border-radius:0;max-height:54vh;overflow-y:auto}.panel[data-mode=chapter]{position:static;inset:auto;width:auto;border:0;border-radius:0;padding:0;overflow:visible;background:var(--bg);box-shadow:none}.stage[data-view=lesson]{display:block;height:auto;min-height:calc(100vh - var(--nav-h));overflow:visible}.stage[data-view=lesson] .canvas-wrap{display:none}.lesson{display:grid;grid-template-columns:264px minmax(0,1fr);gap:44px;max-width:1240px;margin:0 auto;padding:30px 28px 0}.lesson-rail{position:sticky;top:calc(var(--nav-h) + 22px);align-self:start;max-height:calc(100vh - var(--nav-h) - 44px);overflow-y:auto;display:flex;flex-direction:column;gap:24px}.rail-group{display:flex;flex-direction:column;gap:4px}.rail-row{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:7px 9px;border:1px solid transparent;border-radius:6px;background:none;color:var(--fg);font-size:13px;line-height:1.3;transition:background .15s ease,border-color .15s ease}.rail-row .rn{font-family:var(--font-mono);font-size:11px;color:var(--muted-strong);flex:none;font-variant-numeric:tabular-nums}.rail-row .rt{min-width:0;display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.rail-row .rp{margin-left:auto;font-family:var(--font-mono);font-size:11px;color:var(--muted-strong);flex:none;font-variant-numeric:tabular-nums}.rail-row:hover{background:var(--fg-soft)}.rail-row[aria-current=true]{background:var(--surface);border-color:var(--fg)}.rail-row[data-done=true] .rp{color:var(--accent-strong)}.rail-row[data-due=true]{box-shadow:inset 2px 0 0 var(--accent)}.rail-row[data-due=true] .rp{color:var(--fg)}.rail-row[disabled],.rail-row[aria-disabled=true]{color:var(--muted);cursor:not-allowed}.rail-row[aria-disabled=true]:hover{background:none}.lesson-main{display:flex;flex-direction:column;gap:26px;min-width:0;padding-bottom:8px}.lesson-head{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding-bottom:20px;border-bottom:1px solid var(--border)}.lesson-head .sym{display:flex;align-items:center;gap:10px;margin-bottom:9px}.reader{width:100%;max-width:42rem;margin:0 auto;display:flex;flex-direction:column;gap:26px}.lesson-foot{position:sticky;bottom:0;z-index:4;width:100%;max-width:42rem;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 0;border-top:1px solid var(--border);background:color-mix(in oklch,var(--bg) 94%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.lesson-foot .btn{flex:1 1 auto}.game{display:flex;flex-direction:column;gap:16px}.g-top{display:flex;align-items:center;gap:22px;flex-wrap:wrap}.g-stat .k{font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}.g-stat .v{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:21px;font-weight:600;letter-spacing:-.02em}.g-board{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:8px;width:100%;max-width:404px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);touch-action:none}.g-cell{aspect-ratio:1 / 1;display:flex;align-items:center;justify-content:center;padding:3px;border-radius:6px;background:var(--bg);border:1px solid var(--border);overflow:hidden}.g-cell[data-l="1"]{background:var(--bg);border-color:var(--border)}.g-cell[data-l="2"]{background:color-mix(in oklch,var(--accent) 10%,var(--bg));border-color:transparent}.g-cell[data-l="3"]{background:color-mix(in oklch,var(--accent) 22%,var(--bg));border-color:transparent}.g-cell[data-l="4"]{background:color-mix(in oklch,var(--accent) 34%,var(--bg));border-color:transparent}.g-cell[data-l="5"]{background:color-mix(in oklch,var(--accent) 46%,var(--bg));border-color:transparent}.g-cell[data-l="6"]{background:color-mix(in oklch,var(--accent) 62%,var(--bg));border-color:transparent}.g-cell[data-l="7"]{background:color-mix(in oklch,var(--accent) 82%,var(--bg));border-color:var(--accent-strong);border-width:2px}.g-lbl{font-family:var(--font-mono);font-size:clamp(11px,2.1vw,12.5px);line-height:1.15;letter-spacing:-.02em;color:var(--fg);text-align:center;word-break:break-word}.g-cell[data-new=true]{animation:tile .18s ease-out}@keyframes tile{0%{transform:scale(.86)}to{transform:scale(1)}}.g-pad{display:grid;grid-template-columns:repeat(3,44px);grid-template-rows:repeat(2,44px);gap:6px}.g-pad button[data-dir=up]{grid-column:2;grid-row:1}.g-pad button[data-dir=left]{grid-column:1;grid-row:2}.g-pad button[data-dir=down]{grid-column:2;grid-row:2}.g-pad button[data-dir=right]{grid-column:3;grid-row:2}.g-pad button{display:flex;align-items:center;justify-content:center;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);color:var(--fg);transition:background .15s ease,border-color .15s ease}.g-pad button:hover{background:var(--surface);border-color:var(--fg)}.g-pad svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.g-pad .gu{grid-column:2;grid-row:1}.g-pad .gl{grid-column:1;grid-row:2}.g-pad .gd{grid-column:2;grid-row:2}.g-pad .gr{grid-column:3;grid-row:2}.g-cap{font-size:13.5px;line-height:1.5;min-height:44px;color:var(--fg)}.g-cap:empty:before{content:"—";color:var(--muted)}.g-play{display:flex;align-items:flex-start;gap:24px;flex-wrap:wrap}.g-side{display:flex;flex-direction:column;gap:10px}.ladder{display:flex;flex-wrap:wrap;gap:6px}.rung{display:inline-flex;align-items:center;gap:6px;padding:5px 9px;border:1px dashed var(--border);border-radius:999px;font-family:var(--font-mono);font-size:11px;color:var(--muted)}.rung i{width:9px;height:9px;border-radius:2px;border:1px solid currentColor}.rung[data-reached=true]{border-style:solid;border-color:var(--accent-strong);color:var(--fg)}.rung[data-reached=true] i{background:var(--accent-strong);border-color:var(--accent-strong)}.panel-head{position:sticky;top:0;z-index:3;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 20px;background:var(--bg);border-bottom:1px solid var(--border)}.panel-head-l{display:flex;align-items:center;gap:9px;min-width:0}.panel-head-r{display:flex;align-items:center;gap:6px;flex:none}.panel-body{padding:20px;display:flex;flex-direction:column;gap:var(--gap-md)}.panel[data-mode=overview] .panel-body{padding:18px 22px;display:grid;align-items:start;gap:20px 28px;grid-template-columns:minmax(250px,1.45fr) minmax(215px,1fr) minmax(196px,.8fr)}.rail-main{display:flex;flex-direction:column;gap:7px}.rail-stats{display:flex;flex-direction:column;gap:13px}.stat-pair{display:flex;gap:26px}.rail-act{display:flex;flex-direction:column;gap:9px}.rail-title{font-size:clamp(21px,1.9vw,27px)}.rail-lead{font-size:13.5px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:15px 17px}.card-flat{background:transparent;border:0;border-top:1px solid var(--border);border-radius:0;padding:16px 0 0}.stat-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:24px;font-weight:600;letter-spacing:-.03em;line-height:1.1}.stat-label{font-size:12px;color:var(--muted);line-height:1.35}.legend{display:flex;flex-wrap:wrap;gap:13px}.legend span{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:var(--muted)}.legend .legend-n{font-style:normal;color:var(--fg)}.swatch{display:inline-block;width:13px;height:13px;border-radius:4px;border:1px solid var(--border)}.swatch.locked{border-style:dashed;background:transparent}.swatch.available{border-color:var(--fg);background:var(--bg)}.swatch.done{border-color:var(--fg-edge);background:var(--fg-edge)}.swatch.next{border-color:var(--accent);background:var(--bg);box-shadow:0 0 0 2px var(--accent-soft)}.swatch.extra{border-style:dashed;border-color:var(--muted);background:transparent}.swatch.bonus{border-style:dashed;border-color:var(--fg-edge);background:transparent}.bmap-legend{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.bmap-legend .bm-item{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--muted)}.bmap-legend .pip{width:16px;height:7px;cursor:default}.bmap-legend .pip:hover{box-shadow:none}.stack-chips{display:flex;flex-wrap:wrap;gap:6px}.stack-chip{display:inline-flex;align-items:center;gap:6px;padding:5px 9px;border:1px solid var(--border);border-radius:999px;background:var(--bg);font-family:var(--font-mono);font-size:11px;color:var(--muted-strong)}.stack-chip svg{width:13px;height:13px;fill:currentColor}.row{display:flex;align-items:center;gap:12px}.row-between{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.stack{display:flex;flex-direction:column;gap:10px}.prose{font-size:15px;line-height:1.62;color:var(--fg)}.prose+.prose{margin-top:12px}.concepts{display:flex;flex-direction:column;gap:13px}.concept{display:flex;flex-direction:column;gap:4px}.concept .k{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--accent-strong)}.concept .v{font-size:14.5px;line-height:1.55;color:var(--fg)}.flowlist{display:flex;flex-direction:column}.flowlist li{display:flex;gap:11px;padding:11px 0;border-top:1px solid var(--border);font-size:14px;line-height:1.55;list-style:none}.flowlist li:first-child{border-top:0;padding-top:4px}.flowlist .fn{font-family:var(--font-mono);font-size:11px;color:var(--accent-strong);flex:none;padding-top:2px}.stepper{display:flex;flex-direction:column;gap:2px}.step{display:flex;align-items:center;gap:11px;width:100%;text-align:left;padding:9px 11px;border:1px solid transparent;border-radius:6px;background:none;color:var(--fg);transition:background .15s ease,border-color .15s ease}.step+.step{margin-top:0}.step .sn{font-family:var(--font-mono);font-size:11px;color:var(--muted-strong);flex:none;width:18px}.step .st{font-size:13.5px;line-height:1.35;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.step .sm{margin-left:auto;font-family:var(--font-mono);font-size:11px;color:var(--muted-strong);flex:none}.step .sdot{width:9px;height:9px;border-radius:999px;border:1px solid var(--border);flex:none}.step:hover{background:var(--fg-soft)}.step[data-state=cur]{background:var(--bg);border-color:var(--fg)}.step[data-state=cur] .sdot{border-color:var(--fg);background:var(--fg)}.step[data-state=done] .sdot{border-color:var(--accent-strong);background:var(--accent-strong)}.step[data-state=done] .st{color:var(--muted)}.step[data-state=wait]{cursor:not-allowed;opacity:.62}.step[data-state=wait] .st{color:var(--muted)}.step[data-kind=check] .sn{color:var(--accent-strong)}.formula{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:15px 16px}.formula .fx{font-family:var(--font-mono);font-size:15px;line-height:1.5;letter-spacing:-.01em;overflow-x:auto}.formula .fx sup,.formula .fx sub{font-size:68%}.tree{display:flex;flex-direction:column;gap:12px}.tnode{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:13px 14px}.tnode .tq{font-size:14px;font-weight:600;line-height:1.35}.tbranches{display:flex;flex-direction:column;gap:7px;margin-top:11px}.tbranch{display:flex;align-items:flex-start;gap:10px;width:100%;text-align:left;padding:10px 12px;min-height:44px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);font-size:13.5px;line-height:1.4;transition:border-color .15s ease,background .15s ease}.tbranch:hover,.tbranch[data-picked=true]{border-color:var(--fg)}.tbranch .bc{font-family:var(--font-mono);font-size:11px;color:var(--muted);flex:none;padding-top:2px}.verdict{display:flex;align-items:flex-start;gap:10px;border-radius:var(--radius);padding:11px 13px;font-size:13.5px;line-height:1.45;border:1px solid var(--border);background:var(--bg)}.verdict[data-tone=stop]{border-color:var(--fg);background:var(--fg-soft)}.verdict[data-tone=pass]{border-color:var(--accent-strong);background:var(--accent-soft)}.verdict[data-tone=warn]{border-color:var(--muted);background:var(--bg)}.verdict .vt{font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;text-transform:uppercase;flex:none;padding-top:2px}.verdict[data-tone=stop] .vt{color:var(--fg)}.verdict[data-tone=pass] .vt{color:var(--accent-strong)}.verdict[data-tone=warn] .vt{color:var(--muted)}.fig{margin:0;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg);overflow:hidden}.fig-head{display:flex;align-items:center;gap:12px;padding:8px 16px;background:var(--surface);border-bottom:1px solid var(--border)}.fig-head .gauge{font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted-strong)}.fig-head .rule{flex:1 1 auto;height:1px;background:var(--border)}.fig-body>.film,.fig-body>.formula,.fig-body>.optlist{border:0;border-radius:0;background:var(--bg)}.optlist{display:flex;flex-direction:column}.optrow{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px;padding:15px 16px;border-bottom:1px solid var(--border)}.optrow:last-child{border-bottom:0}.opt-name{display:block;font-size:10.5px;letter-spacing:.08em;color:var(--muted-strong)}.opt-title{display:block;margin-top:4px;font-size:15px;font-weight:600;color:var(--fg)}.opt-what{margin:6px 0 0;font-size:14px;line-height:1.55;color:var(--fg)}.opt-meta{display:flex;flex-direction:column;gap:11px}.offer{margin-top:14px;padding:13px 14px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);display:flex;align-items:center;justify-content:space-between;gap:16px}.offer-main{min-width:0}.offer-title{margin:5px 0 4px;font-size:15px;font-weight:600;color:var(--fg)}.offer .meta,.offer .eyebrow{color:var(--muted-strong)}@media(max-width:780px){.optrow{grid-template-columns:minmax(0,1fr);gap:11px}}.fig-body>.tree{padding:16px}.fig-body>.tree>.tnode{border:0;background:transparent;padding:0}.fig-foot{display:block;padding:13px 16px;background:var(--surface);border-top:1px solid var(--border)}.fig-cap{display:block;min-height:50px;font-size:15px;line-height:1.62;color:var(--fg)}.fig-src{display:flex;align-items:baseline;gap:9px;flex-wrap:wrap;margin-top:10px;font-family:var(--font-mono);font-size:11px;color:var(--muted-strong)}.fig-src a{color:var(--fg);text-decoration:underline;text-decoration-color:var(--muted-strong);text-underline-offset:2px}.fig-src a:hover{text-decoration-color:var(--accent-strong);text-decoration-thickness:2px}.fig-foot>.fig-src:first-child{margin-top:0}.fig-src b{color:var(--fg);font-weight:600}.fig-src.plain{margin-top:0}.further{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:14px 16px}.further .srcline{color:var(--muted-strong);font-size:12px}.further .srcline+.srcline{margin-top:7px}.srctopic{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted-strong);margin:14px 0 6px}.srctopic:first-of-type{margin-top:4px}.film{overflow:hidden}.film-stage{position:relative;background:var(--bg);border-bottom:1px solid var(--border)}.film-stage svg{width:100%;height:auto}.fi{opacity:.32;transition:opacity .45s ease,transform .45s ease}.fi.on{opacity:1}.fi .fbox{fill:var(--surface);stroke:var(--border);stroke-width:1.4;transition:fill .4s ease,stroke .4s ease}.fi.on .fbox{stroke:var(--fg)}.fi.hot .fbox{fill:var(--accent-soft);stroke:var(--accent-strong);stroke-width:1.8}.fi.dim .fbox{fill:var(--bg);stroke-dasharray:3 4}.fi .flbl{font-family:var(--font-body);font-size:12.5px;font-weight:500;fill:var(--fg)}.fi .fsub{font-family:var(--font-mono);font-size:11px;fill:var(--muted-strong)}.fi .fcap{font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;text-transform:uppercase;fill:var(--muted-strong)}.fi .fwire{fill:none;stroke:var(--border);stroke-width:1.5}.fi.on .fwire{stroke:var(--muted)}.fi.hot .fwire{stroke:var(--accent-strong);stroke-width:2}.fi.hot .fwire.dash{stroke-dasharray:5 5;animation:crawl 1.1s linear infinite}@keyframes crawl{to{stroke-dashoffset:-20}}.fi .fbar-bg{fill:var(--border)}.fi .fbar{fill:var(--fg)}.fi.hot .fbar{fill:var(--accent-strong)}.fi .fframe{fill:none;stroke:var(--border);stroke-dasharray:5 5;stroke-width:1.2}.film-bar{display:flex;align-items:center;gap:11px;padding:9px 13px;border-top:1px solid var(--border);background:var(--bg)}.film-bar .fctl{display:flex;gap:1px;border:1px solid var(--border);border-radius:6px;overflow:hidden;background:var(--border);flex:none}.film-bar .fctl button{display:flex;align-items:center;justify-content:center;width:38px;height:38px;background:var(--bg);border:0;color:var(--fg)}.film-bar .fctl button:hover{background:var(--fg-soft)}.film-bar .fctl button+button{border-left:1px solid var(--border)}@media(hover:none){.film-bar{flex-wrap:wrap;row-gap:8px}.film-bar .fctl button{width:44px;height:44px}.film-bar .dots{display:none}.film-bar .track{height:44px;background:none;overflow:visible}.film-bar .track:before{content:"";position:absolute;left:0;right:0;top:50%;height:5px;margin-top:-2.5px;border-radius:999px;background:var(--border)}.film-bar .track i{top:50%;bottom:auto;height:5px;margin-top:-2.5px}}.film-bar .fctl svg{width:13px;height:13px;fill:currentColor}.film-bar .fctl svg.st{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}.film-bar .track{position:relative;flex:1 1 auto;height:5px;background:var(--border);border-radius:999px;overflow:hidden;cursor:pointer}.film-bar .track i{position:absolute;inset:0 auto 0 0;background:var(--accent);border-radius:999px;transition:width .3s linear}.film-bar .dots{display:flex;gap:0;flex:none}.film-bar .dots button{position:relative;width:24px;height:24px;padding:0;border:0;background:none}.film-bar .dots button:before{content:"";position:absolute;left:50%;top:50%;width:7px;height:7px;margin:-3.5px 0 0 -3.5px;border-radius:999px;border:1px solid var(--border);background:var(--bg)}.film-bar .dots button[aria-current=true]:before{background:var(--fg);border-color:var(--fg)}.film-bar .fc{font-family:var(--font-mono);font-size:11px;color:var(--muted);flex:none;font-variant-numeric:tabular-nums}.ex{display:flex;flex-direction:column;gap:12px}.ex-inst{font-size:13px;color:var(--muted)}.ex-pool{display:flex;flex-direction:column;gap:8px}.ex-opt{display:flex;align-items:flex-start;gap:10px;width:100%;text-align:left;padding:12px 13px;min-height:44px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);font-size:14px;line-height:1.4;transition:border-color .15s ease,background .15s ease}.ex-opt:hover{border-color:var(--fg)}.ex-opt[data-pick=true]{border-color:var(--fg);border-width:2px;padding:11px 12px}.ex-opt[data-result=right]{border-color:var(--accent-strong);background:var(--accent-soft)}.ex-opt[data-result=wrong]{border-color:var(--fg);background:var(--fg-soft)}.ex-opt[data-result]{cursor:default}.ex-opt .mark{font-family:var(--font-mono);font-size:12px;color:var(--muted);flex:none;padding-top:2px}.ex-opt[data-result=right] .mark{color:var(--accent-strong)}.ex-opt[data-result=wrong] .mark{color:var(--fg)}.ex-bins{display:grid;gap:8px}.ex-bin{border:1px dashed var(--border);border-radius:var(--radius);background:var(--bg);padding:10px 12px;text-align:left;display:flex;flex-direction:column;gap:6px;min-height:60px}.ex-bin:hover{border-color:var(--fg);border-style:solid}.ex-bin .lbl{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}.ex-bin .slot{font-size:12.5px;line-height:1.35;padding:6px 8px;border-radius:5px;background:var(--fg-soft)}.ex-fb{font-size:13px;line-height:1.5;min-height:40px;border-top:1px solid var(--border);padding-top:10px}.ex-fb:empty{border-top-color:transparent;min-height:0;padding-top:0}.ex-fb[data-tone=right]{color:var(--accent-strong)}.ex-fb[data-tone=wrong]{color:var(--fg)}.goal{font-size:14.5px;line-height:1.55;color:var(--fg);margin-top:12px;max-width:62ch}.goal .k{display:block;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted-strong);margin-bottom:4px}.ex-opt .rc{display:inline-block;font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted-strong);border:1px solid var(--border);border-radius:4px;padding:1px 5px;margin-right:6px;vertical-align:1px}.ex-passed .meta{color:var(--fg)}.sr-live{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.ex-passed{display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--accent-strong);background:var(--accent-soft);border-radius:var(--radius);padding:11px 13px;font-size:13.5px}.banner{display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--border);background:var(--surface);border-radius:var(--radius);padding:11px 13px;font-size:13.5px}.navrow{display:flex;align-items:center;justify-content:space-between;gap:10px;border-top:1px solid var(--border);padding-top:14px}.navrow .btn{flex:1 1 auto}.scrim{position:fixed;inset:0;z-index:60;background:var(--scrim);display:grid;place-items:center;padding:24px}.modal{width:min(700px,100%);max-height:min(84vh,720px);overflow-y:auto;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 32px 64px -40px var(--scrim)}.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:20px 22px 15px;border-bottom:1px solid var(--border)}.modal-body{padding:19px 22px 22px;display:flex;flex-direction:column;gap:14px;font-size:14.5px;line-height:1.6}.modal-body>p{color:var(--fg)}.modal-body .credit{font-family:var(--font-mono);font-size:11px;line-height:1.6;color:var(--muted);border-top:1px solid var(--border);padding-top:13px}.idcard{display:flex;align-items:center;gap:13px;padding-bottom:15px;border-bottom:1px solid var(--border)}.idmono{flex:none;width:46px;height:46px;display:grid;place-items:center;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);font-family:var(--font-mono);font-size:15px;letter-spacing:.04em;color:var(--fg)}.idname{font-size:19px;font-weight:600;letter-spacing:-.02em;color:var(--fg)}.idrole{margin-top:3px;font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-strong)}.idplace{margin-top:3px;font-size:13px;color:var(--muted-strong)}.profiles{display:flex;flex-wrap:wrap;gap:4px 18px}.profiles a{display:inline-flex;align-items:center;min-height:24px;padding:0 2px;font-family:var(--font-mono);font-size:12px;color:var(--fg);text-decoration:underline;text-decoration-color:var(--border);text-decoration-thickness:1px;text-underline-offset:3px;transition:text-decoration-color .15s ease}.profiles a:hover{text-decoration-color:var(--accent);text-decoration-thickness:2px}.profiles a:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:3px}.stacklabel{font-family:var(--font-mono);font-size:11px;color:var(--muted-strong)}.srcline{display:flex;gap:9px;align-items:baseline;font-family:var(--font-mono);font-size:11px;line-height:1.55;color:var(--muted)}.srcline b{color:var(--fg);font-weight:500;flex:none}.toast{position:fixed;left:50%;bottom:28px;z-index:70;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--fg);color:var(--bg);padding:11px 18px;border-radius:999px;font-size:13.5px;transition:opacity .2s ease,transform .2s ease;max-width:min(560px,calc(100vw - 32px));text-align:center}.toast.show{opacity:1;transform:translate(-50%)}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.node[data-next=true]:after,.node[data-ignite=true],.edges path[data-next=true],.edges path[data-ignite=true]{animation:none}}@media(max-width:1200px){.meter .bar{display:none}.lesson{grid-template-columns:228px minmax(0,1fr);gap:30px}}@media(max-width:1040px){.stage{display:block;height:auto;min-height:0;overflow:visible}.canvas-wrap{position:relative;inset:auto;height:300px;border-bottom:1px solid var(--border)}.canvas{cursor:default;touch-action:pan-y}.zoom,.minimap,.hint-strip{display:none}.panel{position:static;width:auto;max-height:none;border:0;border-top:1px solid var(--border);border-radius:0;box-shadow:none}.panel[data-mode=overview]{max-height:none;overflow:visible}.panel[data-mode=overview] .panel-body{display:block;padding:20px 18px}.panel[data-mode=overview] .panel-body>*+*{margin-top:18px}.lesson{display:block;padding:22px 18px 0}.nodes .blockmap{display:none}.nodes .node-bar{display:block}.lesson-rail{position:static;max-height:none;overflow:visible;gap:20px;margin-bottom:22px}.rail-row,.step{min-height:44px}.lesson-rail .rail-group[data-outline=true]{display:none}.lesson-head{flex-direction:column;gap:14px}.reader,.lesson-foot{max-width:none}.crumbs{display:none}.g-board{max-width:340px}}@media(max-width:860px){.meter{padding:4px 10px}.brand{flex:1 1 100%}.nav-right{margin-left:0;width:100%;justify-content:space-between}.chip{padding:0 10px}#review-word{display:none}.topnav-inner{padding:9px 16px}.panel-body{padding:16px}.panel[data-mode=overview] .panel-body{padding:18px 16px}.lesson{padding:18px 16px 0}.canvas-wrap{height:240px}}
