:root{--c-red: #d2232a;--c-red-strong: #a61b21;--c-red-tint: #fbedee;--c-red-hot: #e8353c;--c-ok-hot: #2fa35b;--c-accent-theory: var(--c-red);--c-accent-practical: #17171a;--c-text: #17171a;--c-text-muted: #6a655e;--c-text-on-dark: #ffffff;--c-ground: #faf7f4;--c-surface: #ffffff;--c-surface-raised: #fdfbf9;--c-surface-sunken: #f5f1ec;--c-surface-inverse: #17171a;--g-card: linear-gradient(180deg, #ffffff 0%, #fdfbf9 100%);--g-panel: linear-gradient(180deg, #fdfbf9 0%, #f8f4ef 100%);--c-inverse-raised: #222226;--c-inverse-hover: #33333a;--c-inverse-line: #44444c;--c-text-muted-on-dark: #c9c9d0;--c-line: #e7e1da;--c-line-strong: #d5cec5;--c-line-card: #9c9083;--c-edge-hard: rgba(23, 23, 26, .85);--c-edge-soft: rgba(23, 23, 26, .16);--c-line-control: #8b857c;--c-ok: #2c7743;--c-ok-bg: #e6f4ea;--c-ok-line: #7fb897;--c-danger: #a61b21;--c-danger-bg: #fce8e6;--c-danger-line: #e08b91;--c-warn: #8a5b00;--c-warn-bg: #fff7e6;--c-warn-line: #d0a752;--font-sans: "Segoe UI", Arial, Helvetica, sans-serif;--font-display: "Archivo", "Segoe UI", Arial, Helvetica, sans-serif;--font-mono: "IBM Plex Mono", Consolas, "Courier New", monospace;--t-xs: 12px;--t-sm: 13px;--t-base: 15px;--t-md: 17px;--t-lg: 20px;--t-xl: 24px;--t-2xl: 30px;--lh-tight: 1.25;--lh-base: 1.5;--lh-loose: 1.65;--fw-normal: 400;--fw-semi: 600;--fw-bold: 700;--track-caps: .08em;--track-tight: -.01em;--t-display: 38px;--t-hero: 60px;--t-giant: 92px;--t-numeral: 120px;--s-1: 4px;--s-2: 8px;--s-3: 12px;--s-4: 16px;--s-5: 20px;--s-6: 24px;--s-8: 32px;--s-10: 40px;--s-12: 48px;--r-sm: 4px;--r-md: 6px;--r-lg: 10px;--r-card: 16px;--r-pill: 999px;--e-1: 0 1px 2px rgba(23, 23, 26, .06), 0 1px 3px rgba(23, 23, 26, .08);--e-2: 0 2px 6px rgba(23, 23, 26, .08), 0 8px 20px rgba(23, 23, 26, .08);--e-3: 0 8px 24px rgba(23, 23, 26, .14), 0 24px 48px rgba(23, 23, 26, .16);--e-glow: 0 12px 32px rgba(210, 35, 42, .35);--m-fast: .12s;--m-base: .18s;--m-slow: .26s;--m-ease: cubic-bezier(.2, .6, .3, 1);--tap-min: 44px;--measure: 68ch;--w-reading: 100%;--pad-screen: var(--s-3);--pad-card: var(--s-4);--t-question: var(--t-md);--gap-options: var(--s-2);--row-dir: column;--row-align: stretch;--row-gap: var(--s-3);--grid-2: 1fr;--grid-cards: 1fr;--grid-fields: 1fr;--w-content: 100%;--w-content-wide: 100%}@media (min-width: 640px){:root{--pad-screen: var(--s-6);--pad-card: var(--s-6);--t-question: var(--t-lg);--gap-options: var(--s-3);--row-dir: row;--row-align: center;--row-gap: var(--s-4);--grid-2: 1fr 1fr;--grid-fields: 1fr 1fr;--w-content: min(80%, 1010px);--w-content-wide: min(80%, 1250px);--w-reading: min(100%, 720px)}}@media (min-width: 1024px){:root{--pad-screen: var(--s-8);--pad-card: var(--s-6);--grid-cards: repeat(auto-fill, minmax(300px, 1fr));--grid-fields: repeat(4, 1fr);--w-content: min(80%, 1180px);--w-content-wide: min(80%, 1420px);--w-reading: min(100%, 800px)}}@media (min-width: 1440px){:root{--pad-screen: var(--s-10);--grid-cards: repeat(auto-fill, minmax(340px, 1fr));--w-content: min(78%, 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var(--c-line-card);border-left-width:5px}.side-rail-layout>nav .rail-item[data-state=active]{border-left-color:var(--c-red);border-bottom-color:var(--c-surface-inverse)}.rail-menu-toggle{display:flex;align-items:center;justify-content:space-between;gap:var(--s-3);width:100%;min-height:52px;margin-top:var(--s-3);padding:var(--s-2) var(--s-3);text-align:left;font-family:var(--font-sans);color:var(--c-text);background:var(--c-surface);border:2px solid var(--c-line-card);border-radius:var(--r-md);cursor:pointer}.rail-menu-where{display:flex;flex-direction:column;gap:2px;min-width:0}.rail-menu-group{font-size:var(--t-xs);font-weight:var(--fw-semi);letter-spacing:var(--track-caps);text-transform:uppercase;color:var(--c-text-muted)}.rail-menu-page{font-size:var(--t-base);font-weight:var(--fw-semi);line-height:var(--lh-tight);overflow-wrap:anywhere}.rail-menu-word{display:inline-flex;align-items:center;gap:var(--s-2);flex:none;font-size:var(--t-sm);font-weight:var(--fw-semi)}.rail-body{display:flex;flex-direction:column}.rail-body[data-open=false]{display:none}.rail-body[data-open=true]{margin-top:var(--s-3)}.rail-dark .rail-menu-toggle{background:var(--c-inverse-raised);border-color:var(--c-inverse-line);color:var(--c-text-on-dark)}.rail-dark .rail-menu-toggle[aria-expanded=true]{border-color:var(--c-red-hot)}.rail-dark .rail-menu-group{color:var(--c-text-muted-on-dark)}@media (max-width: 639.98px){table.ltable-stack,table.ltable-grid{width:100%!important;min-width:0!important}table.ltable-stack>thead,table.ltable-grid>thead{display:none}table.ltable-stack>tbody,table.ltable-stack>tbody>tr,table.ltable-grid>tbody{display:block}table.ltable-stack>tbody>tr{padding:var(--s-2) 0}table.ltable-stack>tbody>tr>td{display:block;padding:var(--s-1) var(--s-2)!important;text-align:left!important;white-space:normal!important;overflow-wrap:anywhere}table.ltable-stack>tbody>tr>td:before,table.ltable-grid>tbody>tr>td:before{content:attr(data-label);font-family:var(--font-mono);font-size:11px;font-weight:var(--fw-semi);letter-spacing:var(--track-caps);text-transform:uppercase;color:var(--c-text-muted)}table.ltable-stack>tbody>tr>td:before{display:inline-block;width:38%;padding-right:var(--s-2);vertical-align:top}table.ltable-stack>tbody>tr>td[data-label=""]:before,table.ltable-grid>tbody>tr>td[data-label=""]:before,table.ltable-grid>tbody>tr>td:first-child:before{content:none}table.ltable-grid>tbody>tr{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:var(--s-1);padding:var(--s-3) 0;border-bottom:1.5px solid var(--c-edge-soft)}table.ltable-grid>tbody>tr>td{display:block;position:static!important;padding:var(--s-1)!important}table.ltable-grid>tbody>tr>td:first-child{grid-column:1 / -1;text-align:left!important}table.ltable-grid>tbody>tr>td:before{display:block}}.rail-head{display:flex;flex-direction:row;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:var(--s-3)}.rail-head>.lhome{align-self:center}.rail-group-block{display:flex;flex-direction:column;border:2px solid var(--c-line-card);border-radius:var(--r-md);background:var(--c-surface);overflow:hidden}.rail-group-block+.rail-group-block{margin-top:var(--s-4)}.rail-group{display:flex;align-items:center;justify-content:space-between;gap:var(--s-2);width:100%;text-align:left;font-family:var(--font-sans);font-size:var(--t-xs);font-weight:var(--fw-semi);letter-spacing:var(--track-caps);text-transform:uppercase;background:var(--c-text-muted);color:var(--c-text-on-dark);border:0;border-left:6px solid var(--c-line-strong);border-radius:0;padding:var(--s-2);cursor:pointer;transition:background-color var(--m-fast) var(--m-ease),border-color var(--m-fast) var(--m-ease)}.rail-group[data-here=true]{background:var(--c-red-strong);border-left-color:var(--c-red)}.rail-group:hover{background:var(--c-text);border-left-color:var(--c-red)}.rail-group-items{display:flex;flex-direction:column;gap:var(--s-1);padding:var(--s-2);background:var(--c-surface-sunken);border-top:2px solid var(--c-line-card)}.rail-item-block{display:flex;flex-direction:column;gap:var(--s-1)}.rail-item{display:block;width:100%;text-align:left;font-family:var(--font-sans);line-height:var(--lh-tight);border:2px solid var(--c-line-card);border-left:5px solid var(--c-line-card);border-radius:var(--r-sm);background:var(--c-surface);color:var(--c-text);cursor:pointer;transition:background-color var(--m-fast) var(--m-ease),border-color var(--m-fast) var(--m-ease),box-shadow var(--m-fast) var(--m-ease),transform var(--m-fast) var(--m-ease)}.rail-item[data-level="0"]{padding:var(--s-2) var(--s-3);font-size:var(--t-base);font-weight:var(--fw-semi)}.rail-item[data-level="1"]{padding:var(--s-1) 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var(--c-line-strong);border-radius:var(--r-pill);padding:0 var(--s-2)}.rail-item[data-state=active] .rail-count{color:var(--c-text-muted-on-dark);background:var(--c-inverse-raised);border-color:var(--c-inverse-line)}.rail-hint{display:block;margin-top:var(--s-1);font-size:var(--t-xs);font-weight:var(--fw-normal);line-height:var(--lh-base);color:var(--c-text-muted-on-dark)}.rail-children{display:flex;flex-direction:column;gap:var(--s-1);margin-left:var(--s-3);padding:var(--s-1) var(--s-1) var(--s-1) var(--s-2);border-left:3px solid var(--c-red);background:var(--c-red-tint);border-radius:0 var(--r-sm) var(--r-sm) 0}.rail-chevron{display:inline-grid;place-items:center;width:20px;height:20px;flex-shrink:0;border:2px solid currentColor;border-radius:var(--r-sm);font-size:0;line-height:0;transition:transform var(--m-fast) var(--m-ease)}.rail-chevron:before{content:"";width:6px;height:6px;border-right:2.5px solid currentColor;border-bottom:2.5px solid currentColor;transform:translateY(-1px) rotate(45deg)}.rail-chevron[data-open=true]{transform:rotate(180deg)}.rail-dark{background:radial-gradient(400px 300px at 110% -8%,rgba(210,35,42,.28),transparent 60%),var(--c-surface-inverse)!important;border:none!important;border-radius:22px;box-shadow:var(--e-2);color:var(--c-text-on-dark)}.rail-dark .rail-group-block{background:var(--c-inverse-raised);border-color:var(--c-inverse-line)}.rail-dark .rail-group{background:var(--c-inverse-raised);color:var(--c-text-on-dark);border-left-color:var(--c-inverse-line)}.rail-dark .rail-group[data-here=true]{background:#d2232a40;border-left-color:var(--c-red-hot)}.rail-dark .rail-group:hover{background:var(--c-inverse-hover);border-left-color:var(--c-red-hot)}.rail-dark .rail-group-items{background:var(--c-surface-inverse);border-top-color:var(--c-inverse-line)}.rail-dark .rail-item{background:var(--c-inverse-raised);color:#ffffffc7;border-color:var(--c-inverse-line);border-left-color:var(--c-inverse-line)}.rail-dark .rail-item:hover{background:var(--c-inverse-hover);border-top-color:#fff6;border-right-color:#fff6;border-bottom-color:#fff6;border-left-color:var(--c-red-hot);color:var(--c-text-on-dark)}.rail-dark .rail-item[data-state=here],.rail-dark .rail-item[data-state=here]:hover{background:#d2232a2e;border-color:var(--c-red);border-left-color:var(--c-red-hot);color:var(--c-text-on-dark)}.rail-dark .rail-item[data-state=active],.rail-dark .rail-item[data-state=active]:hover{background:var(--c-surface);color:var(--c-text);border-color:var(--c-surface);border-left-color:var(--c-red);box-shadow:var(--e-2)}.rail-dark .rail-children{background:#d2232a1f;border-left-color:var(--c-red-hot)}.rail-dark .rail-count{background:var(--c-inverse-hover);border-color:var(--c-inverse-line);color:var(--c-text-muted-on-dark)}.rail-dark .rail-item[data-state=active] .rail-count{background:var(--c-surface-sunken);border-color:var(--c-line-strong);color:var(--c-text-muted)}.lhome{display:inline-flex;align-items:center;gap:var(--s-2);align-self:flex-start;width:auto;padding:7px 14px 7px 11px;font-family:var(--font-display);font-size:13px;font-weight:var(--fw-semi);line-height:1.2;color:#ffffffe6;background:var(--c-inverse-hover);border:1.5px solid rgba(255,255,255,.16);border-radius:11px;text-decoration:none;cursor:pointer;transition:background-color var(--m-fast) var(--m-ease),color var(--m-fast) var(--m-ease)}.lhome:hover{background:var(--c-inverse-line);color:var(--c-text-on-dark)}.lhome svg{flex:none;color:var(--c-red-hot)}@media (min-width: 1024px){.lhome{margin-bottom:var(--s-4)}}.ltile{background:var(--c-surface);border:2px solid var(--c-edge-soft);border-radius:var(--r-card);overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--e-1);transition:box-shadow var(--m-fast) var(--m-ease),transform var(--m-fast) var(--m-ease)}.ltile[data-hover=lift]:hover{box-shadow:var(--e-2);transform:translateY(-2px)}.lrow{cursor:pointer;transition:background-color var(--m-fast) var(--m-ease)}.lrow:hover{background-color:var(--c-surface-sunken)}.lband{border:2px solid var(--c-edge-hard);border-radius:24px;overflow:hidden;display:flex;flex-direction:column;background:var(--c-surface);box-shadow:var(--e-2)}.lband[data-locked=true]{border-style:dashed;border-color:var(--c-line-card);box-shadow:none}.lband-cover{flex-shrink:0;padding:var(--s-8);display:flex;flex-direction:column;gap:var(--s-3)}.lband-grid{flex:1;background:var(--c-ground);padding:var(--s-5);display:grid;grid-template-columns:1fr;gap:var(--s-5);align-content:start}@media (min-width: 720px){.lband{flex-direction:row;align-items:stretch}.lband-cover{width:300px}.lband-grid{grid-template-columns:repeat(2,minmax(0,1fr));padding:var(--s-6);gap:var(--s-6)}}@media (min-width: 1280px){.lband-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}.lbtn{display:inline-flex;align-items:center;justify-content:center;gap:var(--s-2);font-family:var(--font-display);font-weight:700;border-radius:12px;cursor:pointer;border:none;transition:transform var(--m-fast) var(--m-ease),box-shadow var(--m-fast) var(--m-ease),filter var(--m-fast) var(--m-ease)}.lbtn-hero{background:linear-gradient(135deg,var(--c-red-hot),var(--c-red-strong));color:var(--c-text-on-dark);font-size:var(--t-base);min-height:52px;padding:0 var(--s-8);box-shadow:var(--e-glow)}.lbtn-hero:hover{transform:translateY(-1px);filter:brightness(1.05)}.lbtn-quiet{background:var(--c-surface);color:var(--c-text);font-size:var(--t-sm);min-height:48px;padding:0 var(--s-6);border:2px solid var(--c-edge-soft)}.lbtn-quiet:hover{border-color:var(--c-edge-hard)}.rail-group .rail-chevron{width:18px;height:18px}@media (min-width: 1024px){:root{--grid-side-rail: minmax(232px, 232px) minmax(0, 1fr)}.side-rail-layout>nav{position:sticky;max-height:calc(100vh - var(--s-8));overflow-y:auto}.rail-menu-toggle{display:none}.rail-body[data-open=false],.rail-body[data-open=true]{display:flex;margin-top:0}.rail-head{flex-direction:column;align-items:flex-start;justify-content:flex-start;flex-wrap:nowrap;gap:var(--s-4)}.rail-head>.lhome{align-self:flex-start}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.u-skeleton{background-image:none;background-color:var(--c-surface-sunken)}}.pathline{--path-accent: var(--c-ok);--path-halo: var(--c-ok-bg);--path-dot: 34px;--path-track: 4px;display:block;min-width:0}.pathline.is-ac{--path-accent: var(--c-red);--path-halo: var(--c-red-tint)}.pathline.is-fittings{--path-accent: var(--c-accent-practical);--path-halo: var(--c-surface-sunken)}.pathline-head{display:flex;align-items:baseline;gap:var(--s-3);margin-bottom:var(--s-3)}.pathline-heading{font-family:var(--font-mono);font-size:var(--t-xs);font-weight:var(--fw-semi);letter-spacing:var(--track-caps);text-transform:uppercase;color:var(--c-text-muted)}.pathline-aside{margin-left:auto;font-size:var(--t-sm);color:var(--c-text-muted)}.pathline-track{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;align-items:flex-start;row-gap:var(--s-4)}.pathline-node{position:relative;display:flex;min-width:96px;flex:1 1 96px}.pathline-node:before,.pathline-node:after{content:"";position:absolute;top:calc(var(--path-dot) / 2 - var(--path-track) / 2);height:var(--path-track);background:var(--c-line-strong)}.pathline-node:before{left:0;right:50%}.pathline-node:after{left:50%;right:0}.pathline-node[data-in=none]:before{content:none}.pathline-node[data-out=none]:after{content:none}.pathline-node[data-in=walked]:before,.pathline-node[data-out=walked]:after{background:var(--path-accent)}.pathline-node[data-state=current][data-in=walked]:before{background:var(--path-accent)}.pathline-hit{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;gap:var(--s-2);width:100%;padding:0 var(--s-1);background:none;border:0;font:inherit;color:var(--c-text);text-align:center}button.pathline-hit{cursor:pointer}button.pathline-hit:focus-visible{outline:none}button.pathline-hit:focus-visible .pathline-dot{box-shadow:var(--focus-ring)}.pathline-dot{display:flex;align-items:center;justify-content:center;flex:none;width:var(--path-dot);height:var(--path-dot);border-radius:var(--r-pill);background:var(--c-surface);border:3px solid var(--c-line-strong);font-family:var(--font-mono);font-size:var(--t-base);font-weight:var(--fw-bold);color:var(--c-text-muted);transition:transform var(--m-fast) var(--m-ease),box-shadow var(--m-fast) var(--m-ease)}.pathline-dot[data-figure=pct]{font-size:var(--t-xs);letter-spacing:-.02em}button.pathline-hit:hover .pathline-dot{transform:translateY(-2px)}.pathline-text{display:flex;flex-direction:column;align-items:center;gap:3px;min-width:0;max-width:100%}.pathline-label{font-family:var(--font-mono);font-size:var(--t-xs);font-weight:var(--fw-semi);letter-spacing:var(--track-caps);text-transform:uppercase;color:var(--c-text-muted);white-space:nowrap}.pathline-caption{font-size:var(--t-sm);font-weight:var(--fw-semi);line-height:var(--lh-tight);color:var(--c-text);max-width:15ch;text-wrap:balance}.pathline-meta{font-size:var(--t-xs);line-height:1.3;color:var(--c-text-muted);font-variant-numeric:tabular-nums;max-width:16ch;text-wrap:balance}.pathline-node[data-state=done] .pathline-dot{background:var(--path-accent);border-color:var(--path-accent);color:var(--c-text-on-dark);font-size:var(--t-lg)}.pathline-node[data-state=done] .pathline-label{color:var(--path-accent)}.pathline-node[data-state=star] .pathline-dot{background:var(--path-accent);border-color:var(--path-accent);color:var(--c-text-on-dark);font-size:var(--t-xl);box-shadow:0 0 0 5px var(--path-halo)}.pathline-node[data-state=star] .pathline-label{color:var(--path-accent)}.pathline-node[data-state=current] .pathline-dot{background:var(--c-surface);border-color:var(--path-accent);border-width:3.5px;color:var(--path-accent);box-shadow:0 0 0 6px var(--path-halo),var(--e-2)}.pathline-node[data-state=current] .pathline-label,.pathline-node[data-state=current] .pathline-caption{color:var(--path-accent)}.pathline-node[data-state=locked] .pathline-dot{background:var(--c-surface-sunken);border-color:var(--c-line-strong);color:var(--c-text-muted)}.pathline-node[data-state=later] .pathline-dot{background:transparent;border-style:dashed;border-width:2px;border-color:var(--c-line-strong);color:var(--c-text-muted);font-weight:var(--fw-semi)}.pathline-node[data-state=later] .pathline-caption,.pathline-node[data-state=later] .pathline-meta{color:var(--c-text-muted)}.pathline-node[data-state=later]:before,.pathline-node[data-state=later]:after,.pathline-node[data-state=later]+.pathline-node:before{background:repeating-linear-gradient(90deg,var(--c-line-strong) 0 6px,transparent 6px 11px)}.pathline.is-compact{--path-dot: 36px;--path-track: 4px}.pathline.is-compact .pathline-dot{font-size:var(--t-sm);border-width:2.5px}.pathline.is-compact .pathline-node{min-width:72px;flex-basis:72px}.pathline.is-compact .pathline-node[data-state=current] .pathline-dot{box-shadow:0 0 0 4px var(--path-halo)}.pathline-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.pathframe{border:2px solid var(--c-red);border-radius:var(--r-card);background:var(--c-surface);margin:var(--s-3) 0}.pathframe-head{display:flex;align-items:baseline;gap:var(--s-3);padding:var(--s-3) var(--s-4);border-bottom:1px solid var(--c-line)}.pathframe-heading{font-family:var(--font-mono);font-size:var(--t-xs);font-weight:var(--fw-semi);letter-spacing:var(--track-caps);text-transform:uppercase;color:var(--c-red-strong)}.pathframe-aside{margin-left:auto;font-size:var(--t-sm);color:var(--c-text-muted)}.pathframe-body{display:grid;gap:var(--s-4);padding:var(--s-4)}.pathframe .pathline,.graft-zone .pathline{--path-dot: 30px;--path-track: 4px}.pathframe .pathline-node{min-width:82px;flex-basis:82px}.pathframe .pathline-dot{font-size:var(--t-sm)}.pathframe .pathline-node[data-state=done] .pathline-dot{font-size:var(--t-base)}.pathframe .pathline-node[data-state=star] .pathline-dot{font-size:var(--t-lg)}.pathframe .pathline-caption{max-width:13ch}@media (max-width: 640px){.pathline{--path-dot: 44px}.pathline-node{flex-basis:84px;min-width:84px}.pathline-dot{font-size:var(--t-sm)}.pathline-caption{max-width:12ch}.pathline-meta{display:none}}@media (prefers-reduced-motion: reduce){.pathline-dot{transition:none}button.pathline-hit:hover .pathline-dot{transform:none}}.stairs{display:grid;grid-template-columns:repeat(var(--stair-n, 6),minmax(0,1fr));gap:0;align-items:stretch;margin-top:var(--s-6)}.stair{position:relative;display:flex;flex-direction:column;gap:6px;min-width:0;padding:26px 14px 16px;background:var(--c-surface);color:var(--c-text);border:1px solid var(--c-line-strong);border-right:none;text-align:left;font:inherit;margin-top:calc((var(--stair-n, 6) - 1 - var(--stair-i, 0)) * (250px / (var(--stair-n, 6) - 1)))}.stair:last-child{border-right:1px solid var(--c-line-strong)}.stair:first-child{background:var(--c-surface-sunken)}.stair-tag{position:absolute;top:-12px;left:14px;padding:3px 10px;border-radius:var(--r-sm);font-family:var(--font-mono);font-size:var(--t-xs);font-weight:var(--fw-bold);letter-spacing:.08em;text-transform:uppercase;color:var(--c-text-on-dark);background:var(--c-text-muted)}.stair:not(:first-child) .stair-tag{background:var(--c-accent-practical)}.stair-name{margin:4px 0 0;font-family:var(--font-display);font-size:var(--t-md);font-weight:800;line-height:var(--lh-tight)}.stair-summary{margin:0;font-size:var(--t-sm);color:var(--c-text-muted);line-height:1.4}.stair-fact{display:flex;gap:6px;align-items:baseline;padding-top:5px;border-top:1px dashed var(--c-line-strong);font-size:var(--t-sm);color:var(--c-text-muted)}.stair-fact b{flex:0 0 62px;font-family:var(--font-mono);font-size:11px;font-weight:var(--fw-bold);letter-spacing:.05em;text-transform:uppercase;color:var(--c-text)}.stair-chip{align-self:flex-start;margin-top:4px;padding:3px 10px;border-radius:var(--r-pill);font-size:var(--t-xs);font-weight:var(--fw-bold);border:1px solid var(--c-line-strong);background:var(--c-surface-sunken);color:var(--c-text-muted)}.stair-chip.is-done{background:var(--c-ok-bg);border-color:var(--c-ok-line);color:var(--c-ok)}.stair-chip.is-current{background:var(--c-red-tint);border-color:var(--c-red);color:var(--c-red-strong)}.stair.is-gate{border:2px solid var(--c-red);box-shadow:0 8px 26px #d2232a24;z-index:2;cursor:pointer;transition:box-shadow var(--m-fast) var(--m-ease)}.stair.is-gate:hover{box-shadow:0 10px 30px #d2232a38}.stair.is-gate .stair-tag{background:var(--c-red)}.stair-kicker{align-self:flex-start;margin-top:2px;padding:3px 10px;border-radius:var(--r-pill);font-family:var(--font-mono);font-size:11px;font-weight:var(--fw-bold);letter-spacing:.08em;text-transform:uppercase;background:var(--c-red);color:var(--c-text-on-dark)}.stair-plates{display:flex;flex-direction:column;gap:7px;margin:4px 0 2px}.stair-plate{display:flex;flex-direction:column;padding:8px 10px;border-radius:8px;color:var(--c-text-on-dark);font-size:var(--t-sm);line-height:1.35;text-align:left}.stair-plate.is-ac,.stair-plate.is-theory{background:var(--c-red)}.stair-plate.is-fittings,.stair-plate.is-practical{background:var(--c-accent-practical)}.stair-plate b{font-size:var(--t-sm);font-weight:var(--fw-bold)}.stair-plate span{opacity:.85;font-size:var(--t-xs)}.stair-toggle{display:flex;align-items:center;justify-content:center;gap:6px;width:100%;margin-top:6px;padding:7px 10px;border-radius:7px;background:var(--c-red);color:var(--c-text-on-dark);font-size:var(--t-xs);font-weight:var(--fw-bold);letter-spacing:.03em}.stair.is-gate:hover .stair-toggle{background:var(--c-red-strong)}.stair.is-done .stair-tag{background:var(--c-ok)}.stair.is-current:not(.is-gate){border-color:var(--c-red);border-width:2px;margin-left:-1px;z-index:1}.stair.is-later{background:var(--c-surface-raised)}.stair.is-later .stair-tag{background:#4a4a52}.l3wrap{position:relative}.l3link{position:relative;height:26px}.l3link:before{content:"";position:absolute;left:var(--l3x, 58.33%);top:0;width:4px;height:26px;background:var(--c-red);transform:translate(-2px)}.l3link:after{content:"";position:absolute;left:var(--l3x, 58.33%);bottom:-1px;border-left:9px solid transparent;border-right:9px solid transparent;border-top:10px solid var(--c-red);transform:translate(-9px)}.l3panel{border:3px solid var(--c-red);border-radius:14px;overflow:hidden;background:var(--c-surface);box-shadow:0 10px 34px #d2232a21}.l3panel-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:13px 20px;background:var(--c-red);color:var(--c-text-on-dark)}.l3panel-tag{padding:4px 12px;border-radius:var(--r-pill);background:#ffffff38;font-family:var(--font-mono);font-size:var(--t-xs);font-weight:var(--fw-bold);letter-spacing:.1em;white-space:nowrap}.l3panel-head>b{flex:1;min-width:220px;font-size:var(--t-base);font-weight:var(--fw-bold)}.l3panel-collapse{padding:6px 12px;border-radius:8px;border:1px solid var(--c-surface);background:var(--c-surface);color:var(--c-red-strong);font:inherit;font-size:var(--t-xs);font-weight:var(--fw-bold);cursor:pointer}.l3panel-collapse:hover{background:var(--c-red-tint)}.l3lane{display:grid;grid-template-columns:160px minmax(0,1fr);border-top:1px solid var(--c-line-strong)}.l3lane:nth-of-type(1){border-top:none}.l3lane-side{display:flex;flex-direction:column;justify-content:center;gap:3px;padding:14px 16px;color:var(--c-text-on-dark);text-decoration:none}.l3lane.is-ac .l3lane-side,.l3lane.is-theory .l3lane-side{background:var(--c-red)}.l3lane.is-fittings .l3lane-side,.l3lane.is-practical .l3lane-side{background:#26262b}a.l3lane-side:hover{filter:brightness(1.08)}.l3lane-side b{font-family:var(--font-display);font-size:var(--t-lg);font-weight:800;line-height:1.1}.l3lane-side small{font-size:var(--t-xs);font-weight:var(--fw-semi);opacity:.82;line-height:1.25}.l3lane-eq{align-self:flex-start;margin-top:4px;padding:3px 8px;border-radius:var(--r-pill);background:#fff3;font-family:var(--font-mono);font-size:11px;font-weight:var(--fw-bold);letter-spacing:.04em}.l3lane-steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr))}.l3step{position:relative;display:flex;flex-direction:column;gap:3px;padding:11px 11px 12px;border-left:1px solid var(--c-line-strong);background:var(--c-surface);min-width:0}.l3step:after{content:"›";position:absolute;right:-7px;top:50%;transform:translateY(-56%);z-index:2;background:var(--c-surface);color:var(--c-line-strong);font-size:21px;font-weight:var(--fw-bold);line-height:1}.l3step:nth-last-child(2):after{display:none}.l3step-badge{align-self:flex-start;min-width:34px;padding:3px 9px;border-radius:var(--r-sm);text-align:center;font-family:var(--font-mono);font-size:var(--t-sm);font-weight:var(--fw-bold);letter-spacing:.05em;color:var(--c-text-on-dark);background:var(--c-red)}.l3lane.is-fittings .l3step-badge,.l3lane.is-practical .l3step-badge{background:var(--c-accent-practical)}.l3step b{font-size:var(--t-sm);font-weight:var(--fw-bold);line-height:1.25}.l3step>span:not(.l3step-badge):not(.l3step-chip){font-size:var(--t-xs);color:var(--c-text-muted);line-height:1.35}.l3step.is-core{background:#fff9f9}.l3lane.is-fittings .l3step.is-core,.l3lane.is-practical .l3step.is-core{background:#fafafb}.l3step.is-beyond{background:#f4f4f6}.l3step.is-beyond .l3step-badge{background:#9c9ca3}.l3step.is-beyond b,.l3step.is-beyond>span{color:#8e8e96}.l3step-chip{align-self:flex-start;margin-top:2px;padding:2px 7px;border-radius:var(--r-pill);background:#e6e6ea;font-size:11px;font-weight:var(--fw-bold);color:var(--c-text-muted)}.l3step.is-done .l3step-chip{background:var(--c-ok-bg);color:var(--c-ok)}.l3step.is-current .l3step-chip{background:var(--c-red-tint);color:var(--c-red-strong)}.l3step.is-done .l3step-badge{background:var(--c-ok)}.l3step.is-current{box-shadow:inset 0 0 0 2px var(--c-red)}.l3lane.is-fittings .l3step.is-current,.l3lane.is-practical .l3step.is-current{box-shadow:inset 0 0 0 2px var(--c-accent-practical)}.l3lane-brace{grid-column:1 / -1;padding:5px 12px;border-top:1px dashed var(--c-red);background:var(--c-red-tint);text-align:center;font-size:var(--t-xs);font-weight:var(--fw-bold);letter-spacing:.02em;color:var(--c-red-strong)}.l3lane.is-fittings .l3lane-brace,.l3lane.is-practical .l3lane-brace{background:#ededf0;border-top-color:var(--c-accent-practical);color:var(--c-text)}.l3panel-foot{padding:11px 20px;border-top:1px solid var(--c-line-strong);background:var(--c-surface-sunken);text-align:center;font-size:var(--t-sm)}.l3panel-foot b{color:var(--c-red-strong)}.hstairs{display:grid;grid-template-columns:repeat(var(--stair-n, 6),minmax(0,1fr));gap:0;align-items:stretch;margin-top:var(--s-5)}.hstair{position:relative;display:flex;flex-direction:column;min-width:0;padding:24px 14px 16px;background:var(--c-surface);color:var(--c-text);text-decoration:none;border:1px solid var(--c-line-strong);border-right:none;margin-top:calc((var(--stair-n, 6) - 1 - var(--stair-i, 0)) * (310px / (var(--stair-n, 6) - 1)));transition:box-shadow var(--m-fast) var(--m-ease),transform var(--m-fast) var(--m-ease)}.hstair:last-child{border-right:1px solid var(--c-line-strong)}.hstair:first-child{background:var(--c-surface-sunken)}.hstair.is-clickable{cursor:pointer}.hstair.is-clickable:hover{box-shadow:0 10px 26px #00000021;transform:translateY(-2px);z-index:5}.hstair-tag{position:absolute;top:-11px;left:14px;padding:3px 10px;border-radius:var(--r-sm);font-family:var(--font-mono);font-size:var(--t-xs);font-weight:var(--fw-bold);letter-spacing:.08em;text-transform:uppercase;color:var(--c-text-on-dark);background:var(--c-red)}.hstairs.is-fittings .hstair-tag,.hstairs.is-practical .hstair-tag{background:var(--c-accent-practical)}.hstair:first-child .hstair-tag{background:var(--c-text-muted)}.hstair.is-later .hstair-tag{background:#4a4a52}.hstair.is-later{background:var(--c-surface-raised)}.hstair-open{position:absolute;top:8px;right:10px;padding:2px 8px;border-radius:var(--r-pill);border:1px solid var(--c-line-strong);background:var(--c-surface-sunken);font-size:var(--t-xs);font-weight:var(--fw-bold);color:var(--c-text-muted)}.hstair.is-clickable:hover .hstair-open{background:var(--c-red);border-color:var(--c-red);color:var(--c-text-on-dark)}.hstair-stars{display:flex;gap:3px;margin:6px 0 4px;font-size:17px;line-height:1}.hstair-stars .on{color:var(--c-red)}.hstairs.is-fittings .hstair-stars .on,.hstairs.is-practical .hstair-stars .on{color:var(--c-accent-practical)}.hstair-stars .off{color:var(--c-line-strong)}.hstair.is-later .hstair-stars .on{color:#4a4a52}.hstair-name{margin:4px 0 2px;font-family:var(--font-display);font-size:var(--t-md);font-weight:800;line-height:var(--lh-tight)}.hstair-desc{margin:0 0 12px;font-size:var(--t-sm);color:var(--c-text-muted);line-height:1.4}.hstair-track{margin-bottom:8px;padding:9px 11px;border-radius:8px;color:var(--c-text-on-dark);font-size:var(--t-sm)}.hstair-track.is-theory{background:var(--c-red)}.hstair-track.is-practical{background:var(--c-accent-practical)}.hstairs.is-fittings .hstair-track.is-theory,.hstairs.is-practical .hstair-track.is-theory{background:#6b6b72}.hstair-track-title{display:block;margin-bottom:3px;font-family:var(--font-mono);font-size:11px;font-weight:var(--fw-bold);letter-spacing:.07em;text-transform:uppercase;opacity:.8}.hstair-track ul{list-style:none;margin:0;padding:0}.hstair-track li{position:relative;padding-left:12px;margin-bottom:2px;line-height:1.35}.hstair-track li:before{content:"";position:absolute;left:0;top:7px;width:5px;height:5px;border-radius:50%;background:#ffffffb3}.hstair-foot{align-self:flex-start;margin-top:auto;padding:3px 11px;border-radius:var(--r-pill);font-size:var(--t-xs);font-weight:var(--fw-bold);border:1px solid var(--c-line-strong);background:#ededf0;color:var(--c-text-muted)}.hstair-foot.is-rule{background:var(--c-red-tint);color:var(--c-red-strong);border-color:var(--c-red)}.hstair-foot.is-done{background:var(--c-ok-bg);color:var(--c-ok);border-color:var(--c-ok-line)}.hstair-foot.is-current{background:var(--c-red-tint);color:var(--c-red-strong);border-color:var(--c-red)}.hstair.is-current{box-shadow:inset 0 0 0 2px var(--c-red);z-index:1}.hstair.is-done .hstair-tag{background:var(--c-ok)}.graft{display:block}.graft-zone{position:relative;margin:22px 0 6px;padding:0 0 16px;border:3px solid var(--c-red);border-radius:14px;background:#fffcfc;box-shadow:0 8px 26px #d2232a1a}.graft-zone:before{content:"";position:absolute;left:var(--l3x, 64%);top:-16px;border-left:10px solid transparent;border-right:10px solid transparent;border-bottom:14px solid var(--c-red);transform:translate(-10px)}.graft-zone-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:10px 18px;border-radius:9px 9px 0 0;background:var(--c-red);color:var(--c-text-on-dark);font-size:var(--t-sm);font-weight:var(--fw-bold)}.graft-zone-tag{padding:3px 11px;border-radius:var(--r-pill);background:#ffffff38;font-family:var(--font-mono);font-size:11px;font-weight:var(--fw-bold);letter-spacing:.1em;white-space:nowrap}.graft-zone-body{padding:6px 18px 0;display:grid;gap:var(--s-4)}.graft-zone-foot{margin:12px 18px 0;padding:9px 14px;border:1px dashed var(--c-red);border-radius:8px;background:var(--c-red-tint);text-align:center;font-size:var(--t-sm)}.graft-zone-foot b{color:var(--c-red-strong)}.graft-legend{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:var(--s-4);padding-top:var(--s-3);border-top:1px solid var(--c-line);font-size:var(--t-xs);color:var(--c-text-muted)}.graft-legend b{display:inline-flex;align-items:center;gap:7px;font-weight:var(--fw-semi);color:var(--c-text)}.graft-legend i{display:inline-block;width:12px;height:12px;border-radius:3px;font-style:normal}.graft-legend i.is-spine{background:var(--c-ok)}.graft-legend i.is-ac,.graft-legend i.is-theory{background:var(--c-red)}.graft-legend i.is-fittings,.graft-legend i.is-practical{background:var(--c-accent-practical)}.graft-legend i.is-beyond{background:#ededf0;border:1px solid #b9b9c0}.pathline-node.is-gate .pathline-dot{--path-dot-here: 1;width:calc(var(--path-dot) + 8px);height:calc(var(--path-dot) + 8px);margin-top:-4px;background:var(--c-red);border-color:var(--c-red);color:var(--c-text-on-dark)}.pathline-node.is-gate .pathline-label,.pathline-node.is-gate .pathline-caption{color:var(--c-red-strong)}.pathline-node.is-gate[data-state=done] .pathline-dot{background:var(--path-accent);border-color:var(--path-accent)}.pathline-node.is-beyond .pathline-dot{background:#ededf0;border-color:#b9b9c0;border-style:solid;color:var(--c-text-muted)}.pathline-node.is-beyond .pathline-label,.pathline-node.is-beyond .pathline-caption,.pathline-node.is-beyond .pathline-meta{color:var(--c-text-muted)}@media 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