.topbar-tools{display:flex;align-items:center;gap:24px}
.lang-switch{display:flex;align-items:center;gap:6px;color:var(--muted);font:500 10px 'DM Mono',monospace;letter-spacing:.1em}
.lang-switch button{padding:0;border:0;color:inherit;background:transparent;font:inherit;cursor:pointer}
.lang-switch button.active{color:var(--ink);font-weight:700}
.lang-switch button:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
@media(max-width:800px){.topbar-tools{margin-left:auto}}
@media(max-width:600px){.topbar-tools .edition{display:none}}

/* Interactive operations map */
.interaction-hint{margin-top:24px!important;padding-left:18px;border-left:3px solid var(--gold);font:500 11px/1.6 'DM Mono',monospace!important;color:var(--muted)!important}
button{font-family:inherit}
.worker-card{display:grid;align-content:space-between;gap:20px;min-height:180px;padding:22px;border:0;color:var(--paper);background:var(--ink);text-align:left;cursor:pointer;transition:background .2s ease,transform .2s ease}
.worker-card span{color:#9eabb4;font:500 10px 'DM Mono',monospace;letter-spacing:.1em}
.worker-card strong{font-size:16px;line-height:1.2}.worker-card code{color:var(--gold);font:11px 'DM Mono',monospace}
.worker-card:hover,.worker-card.active{background:#244760}.worker-card.active{box-shadow:inset 0 -4px 0 var(--gold)}.worker-card:active{transform:translateY(2px)}
.worker-detail{display:grid;grid-template-columns:.55fr 1.1fr 1.2fr;gap:1px;margin-top:1px;background:var(--line)}
.worker-detail>*{margin:0;padding:16px 20px;background:#edf0f1}.worker-detail span,.worker-detail small{font:500 10px/1.5 'DM Mono',monospace;letter-spacing:.06em;text-transform:uppercase}.worker-detail span{color:var(--accent)}.worker-detail strong{font-size:13px}.worker-detail small{color:var(--muted);text-transform:none}

.tree-lab{min-width:0;border:1px solid #41596b;background:#0b1b27;box-shadow:18px 18px 0 #081621}
.tree-toolbar{display:flex;justify-content:space-between;padding:14px 18px;border-bottom:1px solid #41596b;color:#9eabb4;font:500 9px 'DM Mono',monospace;letter-spacing:.1em;text-transform:uppercase}
.tree-live{display:flex;align-items:center;gap:8px}.tree-live i{display:block;width:7px;height:7px;border-radius:50%;background:#80c69a;box-shadow:0 0 0 4px #80c69a22}
.tree-stage{position:relative;height:330px;overflow:hidden;background-image:linear-gradient(#ffffff06 1px,transparent 1px),linear-gradient(90deg,#ffffff06 1px,transparent 1px);background-size:24px 24px}
.tree-stage svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}.tree-edge{fill:none;stroke:#527f9f;stroke-width:2;stroke-dasharray:5 5;vector-effect:non-scaling-stroke}.tree-edge.trunk{stroke:var(--gold);stroke-dasharray:none;stroke-width:3}
.tree-node{position:absolute;z-index:2;display:grid;gap:6px;width:164px;padding:13px 15px;border:1px solid #527085;color:var(--paper);background:#112a3b;text-align:left;cursor:pointer;transition:border-color .2s ease,background .2s ease,transform .2s ease,box-shadow .2s ease}
.tree-node span,.tree-node small{font:500 8px 'DM Mono',monospace;letter-spacing:.08em}.tree-node span{color:#8ca1af}.tree-node strong{font:600 12px 'DM Mono',monospace}.tree-node small{color:#a9b6be}
.tree-node.root{top:25px;left:50%;transform:translateX(-50%);border-color:var(--gold)}.tree-node.branch{top:220px}.tree-node.ui{left:3%}.tree-node.tests{left:50%;transform:translateX(-50%)}.tree-node.docs{right:3%}
.tree-node:hover,.tree-node.active{border-color:var(--gold);background:#1c425a;box-shadow:0 0 0 4px #efc76b18}.tree-node.root:hover,.tree-node.root.active{transform:translateX(-50%) translateY(-3px)}.tree-node.tests:hover,.tree-node.tests.active{transform:translateX(-50%) translateY(-3px)}.tree-node.ui:hover,.tree-node.ui.active,.tree-node.docs:hover,.tree-node.docs.active{transform:translateY(-3px)}
.tree-detail{display:grid;grid-template-columns:.7fr 1fr 1.6fr;gap:1px;border-top:1px solid #41596b;background:#41596b}.tree-detail>div,.tree-detail>p,.tree-detail>code{margin:0;padding:18px;background:#102536}.tree-detail div{display:grid;gap:8px}.tree-detail span{color:var(--accent);font:500 8px 'DM Mono',monospace;letter-spacing:.1em}.tree-detail strong{color:var(--paper);font:500 11px 'DM Mono',monospace}.tree-detail p{color:#aebbc3;font-size:11px;line-height:1.55}.tree-detail code{grid-column:1/-1;color:var(--gold);font:11px 'DM Mono',monospace}

.route-console{display:grid;gap:14px}.route-table button{display:grid;grid-template-columns:.8fr .9fr 1.4fr;width:100%;padding:0;border:0;color:inherit;background:transparent;text-align:left;cursor:pointer}.route-table button>*{padding:15px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.route-table button:hover,.route-table button.active{background:#e8ecee}.route-table button.active strong{box-shadow:inset 4px 0 0 var(--gold)}
.route-detail{display:grid;grid-template-columns:100px 1fr;gap:22px;align-items:center;padding:22px;color:var(--paper);background:var(--deep)}.route-meter{display:grid;align-items:end;width:76px;height:76px;padding:7px;border:1px solid #496274}.route-meter span{display:block;width:100%;height:var(--score);background:var(--gold);transition:height .35s ease}.route-detail>div:last-child{display:grid;gap:7px}.route-detail small{color:var(--gold);font:500 8px 'DM Mono',monospace;letter-spacing:.08em}.route-detail strong{font-size:17px}.route-detail p{margin:0;color:#b5c0c7;font-size:12px;line-height:1.5}

.skill-explorer{display:grid;grid-template-columns:.9fr 1.1fr;min-height:290px;background:var(--blue)}.skill-package button{display:grid;grid-template-columns:1fr 1fr;gap:15px;padding:17px 20px;border:0;border-bottom:1px solid #ffffff40;color:var(--paper);background:transparent;text-align:left;cursor:pointer}.skill-package button:hover,.skill-package button.active{background:#315f80}.skill-package button.active{box-shadow:inset 4px 0 0 var(--gold)}.skill-package button code{font:12px 'DM Mono',monospace}.skill-package button small{opacity:.7}
.skill-detail{display:grid;grid-template-columns:auto 1fr;gap:18px;align-content:center;padding:28px;color:var(--paper);background:#244760}.skill-detail>span{color:var(--gold);font:42px Georgia,serif}.skill-detail>div{display:grid;gap:13px}.skill-detail strong{font:600 15px 'DM Mono',monospace}.skill-detail p{margin:0;color:#c4cdd3;font-size:12px;line-height:1.65}.skill-detail small{color:var(--gold);font:500 8px 'DM Mono',monospace;letter-spacing:.06em;text-transform:uppercase}

.worker-card:focus-visible,.tree-node:focus-visible,.route-table button:focus-visible,.skill-package button:focus-visible{outline:3px solid var(--gold);outline-offset:-3px}

/* Skill shelf */
.skill-builder{margin-bottom:150px;padding-top:80px;border-top:1px solid var(--line)}
.builder-intro{display:grid;grid-template-columns:.95fr 1.05fr;gap:70px;align-items:end;margin:45px 0}.builder-intro h2{margin-bottom:0}.builder-intro>p{max-width:620px;margin:0;color:var(--muted);font-size:14px;line-height:1.75}
.builder-workbench{display:grid;grid-template-columns:minmax(220px,.65fr) minmax(380px,1.35fr) minmax(270px,.85fr);min-height:570px;border:1px solid var(--line);background:var(--line)}
.builder-steps{display:grid;grid-template-rows:repeat(5,1fr);gap:1px;background:var(--line)}.builder-steps button{display:grid;grid-template-columns:42px 1fr;grid-template-rows:auto auto;align-content:center;column-gap:13px;padding:18px;border:0;color:var(--ink);background:var(--paper);text-align:left;cursor:pointer}.builder-steps button b{grid-row:1/-1;align-self:center;color:var(--accent);font:500 11px 'DM Mono',monospace}.builder-steps button span{font:700 12px 'DM Mono',monospace}.builder-steps button small{margin-top:5px;color:var(--muted);font-size:10px}.builder-steps button:hover{background:#eceff0}.builder-steps button.active{color:var(--paper);background:var(--blue);box-shadow:inset 5px 0 0 var(--gold)}.builder-steps button.active b,.builder-steps button.active small{color:var(--gold)}
.builder-detail{display:grid;grid-template-rows:auto auto auto 1fr auto;align-content:start;padding:38px clamp(28px,4vw,58px);color:var(--paper);background:var(--deep)}.builder-detail header{display:flex;justify-content:space-between;align-items:center}.builder-detail header span{color:#ffffff30;font:500 54px 'DM Mono',monospace}.builder-detail header small,.builder-action span,.builder-detail footer span{color:var(--gold);font:500 8px 'DM Mono',monospace;letter-spacing:.1em}.builder-detail h3{margin:27px 0 14px;font-size:clamp(26px,3vw,44px);line-height:1.05;letter-spacing:-.05em}.builder-detail blockquote{margin:0;padding:0;color:#a9bcc8;font:italic 20px/1.35 Georgia,serif}.builder-action{align-self:center;margin:34px 0}.builder-action p{margin:11px 0 0;color:#d5dde2;font-size:13px;line-height:1.7}.builder-detail footer{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:#ffffff2b}.builder-detail footer>div{display:grid;gap:10px;padding:17px;background:#18364a}.builder-detail footer strong{font-size:11px;line-height:1.5}
.builder-artifact{display:grid;grid-template-rows:auto 1fr auto;color:var(--paper);background:#0b1b27}.artifact-head{display:flex;justify-content:space-between;padding:17px;border-bottom:1px solid #344c5d;font:500 8px 'DM Mono',monospace;letter-spacing:.09em}.artifact-head i{width:8px;height:8px;border-radius:50%;background:#80c69a;box-shadow:0 0 0 4px #80c69a20}.builder-artifact pre{display:grid;align-items:center;margin:0;padding:28px;overflow:auto;color:#bed0dc;background-image:linear-gradient(#ffffff05 1px,transparent 1px),linear-gradient(90deg,#ffffff05 1px,transparent 1px);background-size:22px 22px}.builder-artifact pre code{font:12px/1.9 'DM Mono',monospace}.artifact-command{display:grid;gap:9px;padding:18px;border-top:1px solid #344c5d}.artifact-command span{color:var(--gold);font:500 8px 'DM Mono',monospace;letter-spacing:.09em}.artifact-command code{font:10px 'DM Mono',monospace}
.builder-loop{display:grid;grid-template-columns:200px 1fr;gap:25px;padding:23px 28px;color:var(--ink);background:var(--gold)}.builder-loop>span{font:700 9px 'DM Mono',monospace;letter-spacing:.09em}.builder-loop>div{font:600 11px 'DM Mono',monospace}.builder-loop i{margin:0 12px;color:var(--accent);font-style:normal}.builder-steps button:focus-visible{position:relative;z-index:2;outline:3px solid var(--gold);outline-offset:-3px}

.skill-catalog{margin-bottom:130px;padding-top:80px;border-top:1px solid var(--line)}
.catalog-intro{display:grid;grid-template-columns:.9fr 1.1fr;gap:70px;align-items:end;margin:45px 0}.catalog-intro h2{margin-bottom:0}.catalog-intro>p{max-width:620px;margin:0;color:var(--muted);font-size:14px;line-height:1.75}
.skill-deck{display:grid;grid-template-columns:minmax(270px,.8fr) minmax(0,1.7fr);min-height:620px;border:1px solid var(--line);background:var(--line)}
.skill-index{display:grid;grid-template-rows:repeat(7,1fr);gap:1px;background:var(--line)}
.skill-index button{display:grid;grid-template-columns:95px 1fr;grid-template-rows:auto auto;align-content:center;column-gap:18px;padding:16px 20px;border:0;color:var(--ink);background:var(--paper);text-align:left;cursor:pointer;transition:background .2s ease,color .2s ease}
.skill-index button span{grid-row:1/-1;align-self:center;color:var(--accent);font:500 8px 'DM Mono',monospace;letter-spacing:.08em}.skill-index button strong{font:600 13px 'DM Mono',monospace}.skill-index button small{margin-top:5px;color:var(--muted);font-size:10px}.skill-index button:hover{background:#eceff0}.skill-index button.active{color:var(--paper);background:var(--deep);box-shadow:inset 5px 0 0 var(--gold)}.skill-index button.active span,.skill-index button.active small{color:var(--gold)}
.common-skill-detail{display:grid;grid-template-rows:auto auto auto 1fr;align-content:start;padding:44px clamp(30px,5vw,78px);color:var(--paper);background:var(--accent);overflow:hidden}.common-skill-detail header{display:flex;justify-content:space-between;align-items:center;padding-bottom:18px;border-bottom:1px solid #ffffff42}.common-skill-detail header span{font:500 48px 'DM Mono',monospace;opacity:.34}.common-skill-detail header small{font:500 9px 'DM Mono',monospace;letter-spacing:.1em}.common-skill-detail h3{margin:38px 0 18px;font-size:clamp(30px,4vw,60px);letter-spacing:-.06em}.common-skill-detail blockquote{max-width:720px;margin:0 0 38px;padding:0;border:0;color:var(--gold);font:400 clamp(20px,2.5vw,34px)/1.15 Georgia,serif;font-style:italic}.common-skill-notes{display:grid;grid-template-columns:1.45fr .9fr .9fr;gap:1px;align-self:end;background:#ffffff42}.common-skill-notes>div{padding:20px;background:#6c6898}.common-skill-notes span{color:var(--gold);font:500 8px 'DM Mono',monospace;letter-spacing:.08em}.common-skill-notes p{margin:12px 0 0;color:#f1f0f7;font-size:12px;line-height:1.55}.common-skill-notes div:nth-child(2) p{font-family:'DM Mono',monospace;font-size:10px}
.skill-loadout{display:grid;grid-template-columns:210px 1fr;gap:25px;padding:24px 28px;color:var(--paper);background:var(--ink)}.skill-loadout>span{color:var(--gold);font:500 9px 'DM Mono',monospace;letter-spacing:.09em}.skill-loadout>div{font:500 11px 'DM Mono',monospace}.skill-loadout b{color:var(--accent);font-size:9px}.skill-loadout i{margin:0 10px;color:var(--gold);font-style:normal}.skill-index button:focus-visible{position:relative;z-index:2;outline:3px solid var(--gold);outline-offset:-3px}
@media(min-width:1600px){.tree-stage{height:390px}.tree-stage svg{height:330px;top:30px}.tree-node.root{top:45px}.tree-node.branch{top:255px}.tree-node{width:190px;padding:17px}.tree-detail{grid-template-columns:.6fr .8fr 1.8fr}.worker-card{min-height:210px;padding:28px}}
@media(min-width:2200px){main{max-width:2880px;padding-inline:clamp(140px,7vw,280px)}.hero{max-width:1420px}.hero h1{font-size:clamp(150px,7vw,220px)}.tree-stage{height:460px}.tree-stage svg{height:380px;top:45px}.tree-node.root{top:65px}.tree-node.branch{top:305px}.tree-node{width:240px;padding:22px}.tree-node strong{font-size:15px}.tree-detail>*{font-size:14px!important}.fleet,.failure-map{margin-bottom:170px}.workflow,.routing,.skills{margin-bottom:180px}}
@media(max-width:1100px){.chapter-links{display:none}.builder-workbench{grid-template-columns:minmax(210px,.65fr) minmax(0,1.35fr)}.builder-artifact{grid-column:1/-1;grid-template-columns:1fr 1fr;grid-template-rows:auto}.builder-artifact .artifact-head{grid-column:1/-1}.artifact-command{align-content:center;border-top:0;border-left:1px solid #344c5d}}
@media(max-width:1050px){.tree-node{width:145px}.tree-detail{grid-template-columns:1fr 1fr}.tree-detail p{grid-column:1/-1}.skill-explorer{grid-template-columns:1fr}}
@media(max-width:800px){.worker-detail{grid-template-columns:1fr}.worktrees{display:block}.worktree-intro{margin-bottom:40px}.tree-lab{box-shadow:9px 9px 0 #081621}.route-table button{min-width:620px}.skill-explorer{grid-template-columns:1fr 1fr}.builder-intro,.catalog-intro{grid-template-columns:1fr;gap:20px}.builder-workbench{grid-template-columns:1fr}.builder-steps{grid-template-columns:1fr 1fr;grid-template-rows:none}.builder-artifact{grid-column:auto}.skill-deck{grid-template-columns:1fr}.skill-index{grid-template-columns:1fr 1fr;grid-template-rows:none}.common-skill-detail{min-height:600px}.common-skill-notes{grid-template-columns:1fr 1fr}.common-skill-notes>div:first-child{grid-column:1/-1}}
@media(max-width:600px){.tree-stage{height:auto;min-height:560px;padding:24px}.tree-stage svg{display:none}.tree-node,.tree-node.root,.tree-node.branch,.tree-node.ui,.tree-node.tests,.tree-node.docs{position:relative;top:auto;right:auto;left:auto;width:100%;margin:0 0 34px;transform:none}.tree-node:not(:last-child)::after{content:'↓';position:absolute;left:50%;bottom:-28px;color:var(--gold)}.tree-node:hover,.tree-node.active,.tree-node.root:hover,.tree-node.root.active,.tree-node.tests:hover,.tree-node.tests.active{transform:translateY(-2px)}.tree-detail{grid-template-columns:1fr}.tree-detail p,.tree-detail code{grid-column:auto}.skill-explorer{grid-template-columns:1fr}.route-detail{grid-template-columns:70px 1fr}.route-meter{width:56px;height:70px}.builder-steps{grid-template-columns:1fr}.builder-steps button{min-height:78px}.builder-detail{padding:28px 24px}.builder-detail footer{grid-template-columns:1fr}.builder-artifact{grid-template-columns:1fr}.builder-artifact .artifact-head{grid-column:auto}.artifact-command{border-left:0;border-top:1px solid #344c5d}.builder-loop{grid-template-columns:1fr}.builder-loop>div{line-height:2}.builder-loop i{margin-inline:4px}.skill-index{grid-template-columns:1fr}.skill-index button{min-height:78px}.common-skill-detail{min-height:0;padding:30px 24px}.common-skill-notes{grid-template-columns:1fr}.common-skill-notes>div:first-child{grid-column:auto}.skill-loadout{grid-template-columns:1fr}.skill-loadout>div{line-height:2}.skill-loadout i{margin-inline:4px}}
@media(prefers-reduced-motion:reduce){.worker-card,.tree-node,.route-meter span{transition:none}.reading-progress span{transition:none}}