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.chapter sup a{font-size:11px;text-decoration:none}
.chapter .footnote{font-size:13px;color:var(--muted);border-top:1px solid var(--rule);padding-top:16px;margin-top:28px}
.chapter .footnote hr{display:none}
.chapter :not(pre)>code{font-weight:600;background:var(--code);border:1px solid var(--rule);border-radius:3px;padding:.05em .3em}
.chapter .task-item{display:flex;align-items:baseline;gap:8px}
.chapter .task-text{min-width:0;flex:1}
.chapter .task-item input[data-task]{appearance:none;width:14px;height:14px;flex:none;border:1px solid var(--rule);border-radius:3px;background:var(--paper);transform:translateY(2px)}
.chapter .task-item input[data-task]:checked{background:var(--ink);border-color:var(--ink)}
.chapter .task-item input[data-task]:checked:after{content:'✓';color:var(--paper);font:11px/14px system-ui;text-align:center;display:block}
.chapter ul:has(.task-item){list-style:none;padding-left:4px}
.chapter h3{position:relative;scroll-margin-top:20px}
.chapter h3 .anchor{opacity:0;margin-left:8px;color:var(--muted);text-decoration:none;font-weight:400;transition:opacity .12s}
.chapter h3:hover .anchor,.chapter h3 .anchor:focus-visible{opacity:1}
.handbook-main .chapter-part h3{scroll-margin-top:24px}
.handbook-main .chapter-outline{margin:0 0 26px;border:1px solid var(--rule);border-radius:5px;background:var(--page);font-size:14px}
.handbook-main .chapter-outline summary{cursor:pointer;padding:11px 16px;font:600 13px/1.4 system-ui;color:var(--muted);list-style:none}
.handbook-main .chapter-outline summary:before{content:'+';margin-right:9px;font-family:ui-monospace,monospace}
.handbook-main .chapter-outline[open] summary:before{content:'−'}
.handbook-main .chapter-outline ol{margin:0;padding:0 16px 13px 34px}
.handbook-main .chapter-outline li{margin:0 0 5px}
.handbook-main .chapter-outline a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--rule)}
.handbook-main .chapter-outline a:hover{border-bottom-color:var(--ink)}
@media(min-width:1700px){.guide-layout{grid-template-columns:minmax(0,1.1fr) minmax(560px,1fr)}}
@media(max-width:1000px){body.iso{padding:0 16px 25px}.masthead{gap:20px;min-height:122px}.brand{display:none}.guide-layout{gap:20px;grid-template-columns:minmax(0,.9fr) minmax(420px,1.1fr)}.heading{font-size:7px;padding:15px 12px 0}.reading-pane{padding:25px 20px}.panel-toolbar{padding:16px}.theme-link{font-size:9px}}
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@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.rotor-streak{filter:none}}
@media(pointer:coarse){.rotor-streak{filter:none}.hovercard{box-shadow:0 4px 14px rgba(0,0,0,.18)}}
@media print{.masthead,.guide-layout{display:block}.figure-column{display:none}.guide-panel{display:block;height:auto;max-height:none;border:0;position:static}.panel-toolbar,.chapter-pager,.code-heading button{display:none}.reading-pane{overflow:visible}.chapter[hidden]{display:block}.chapter{break-before:page}.code-block pre{max-height:none;white-space:pre-wrap}body.iso{background:#fff;color:#000}}
body.iso .iso-page{width:100%;max-width:1680px;margin:0 auto}
.hovercard{position:absolute;z-index:30;max-width:300px;pointer-events:none;background:var(--paper);border:1px solid var(--rule);border-radius:4px;padding:9px 12px;display:flex;flex-direction:column;gap:3px;box-shadow:0 6px 24px rgba(0,0,0,.18);font:11px/1.5 system-ui}
.hovercard b{font:600 12px/1.4 system-ui;color:var(--ink)}
.hovercard span{color:var(--muted)}
.hovercard i{font:10px/1.4 ui-monospace,monospace;color:var(--muted);font-style:normal;opacity:.8}
.it[data-hover] .iso-edge{stroke:var(--signal);stroke-width:1px}
.toc a.read span{color:var(--ink)}
.toc a.read:after{content:'✓';margin-left:auto;color:var(--muted);font-size:10px}
[data-read-count]{margin-left:auto;color:var(--muted);font:10px ui-monospace,monospace}
.modal-backdrop{position:fixed;inset:0;z-index:100;display:flex;align-items:stretch;justify-content:flex-end;pointer-events:none}
.modal-backdrop[hidden]{display:none}
.modal-card{pointer-events:auto;background:var(--paper);border-left:1px solid var(--rule);width:min(720px,54vw);max-width:100%;height:100dvh;display:flex;flex-direction:column;overflow:hidden;box-shadow:-24px 0 80px rgba(0,0,0,.28)}
.modal-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:18px 24px;border-bottom:1px solid var(--rule);flex:none}
.modal-heading h2{font:500 clamp(19px,2vw,26px)/1.2 system-ui;letter-spacing:-.03em;margin:4px 0 0}
.modal-nav{display:flex;gap:6px;flex:none}
.modal-nav button{border:1px solid var(--rule);background:transparent;padding:7px 11px;border-radius:3px;font-size:12px;color:var(--ink)}
.modal-body{padding:24px 28px 30px;overflow:auto;overscroll-behavior:contain;scrollbar-gutter:stable}
.modal-body p{margin:0 0 15px}
.modal-body h3{font:600 15px/1.4 system-ui;margin:26px 0 11px}
.modal-body .chapter-pager{display:none}
@media(max-width:760px){
.modal-card{width:100%;border:0}
.modal-head{padding:14px 16px}
.modal-body{padding:18px 16px 26px}
.hovercard{max-width:220px}
}
@media print{.modal-backdrop,.hovercard{display:none!important}}

/* Autonomous UAV Lab: preserve the original monochrome engineering style. */
[hidden]{display:none!important}
.topic-tabs{max-width:1680px;margin:16px auto 0;display:flex;gap:7px;overflow-x:auto;padding:0 0 8px;scrollbar-width:thin}
.topic-tabs a{flex:none;border:1px solid var(--rule);border-radius:3px;padding:7px 11px;text-decoration:none;font:11px/1.35 ui-monospace,monospace;white-space:nowrap}
.topic-tabs a[aria-current="page"],.topic-tabs a:hover{background:var(--code);border-color:var(--ink)}
.guide-layout{grid-template-columns:minmax(0,var(--model-width,48%)) 8px minmax(0,1fr);gap:10px}
.layout-splitter{position:relative;min-height:350px;align-self:stretch;cursor:col-resize;touch-action:none;border-radius:4px;outline-offset:3px}
.layout-splitter::after{content:"";position:absolute;left:3px;top:12%;bottom:12%;width:2px;background:var(--rule);border-radius:3px}
.layout-splitter:hover::after,.layout-splitter:focus-visible::after{background:var(--signal);width:4px;left:2px}
.figure-column{min-width:0}
.camera-controls{display:flex;flex-wrap:wrap;gap:5px;padding:10px 13px 6px;align-items:center}
.camera-controls button{border:1px solid var(--rule);background:transparent;border-radius:3px;padding:5px 9px;font:11px/1.4 ui-monospace,monospace}
.camera-controls button:hover,.camera-controls [aria-pressed="true"]{background:var(--code);border-color:var(--ink)}
.stage{cursor:grab;touch-action:none;user-select:none}
.stage:active{cursor:grabbing}
.hovercard{pointer-events:none}
.guide-panel{height:calc(100dvh - 170px)}
.toc nav{grid-template-columns:1fr 1fr;gap:4px 10px;max-height:290px}
.toc-group{grid-column:1/-1;color:var(--muted);font:600 10px/1.5 ui-monospace,monospace;border-top:1px solid var(--rule);padding:9px 5px 2px;margin-top:5px}
.guide-body{display:flex;flex:1;min-height:0}
.guide-body>.toc{flex:0 0 clamp(170px,30%,230px);min-width:0;overflow:auto;border-right:1px solid var(--rule);padding:16px 10px}
.guide-body>.reading-pane,.guide-body>.component-detail{flex:1;min-width:0}
.toc-progress{display:flex;justify-content:space-between;gap:6px;color:var(--muted);font:10px/1.6 ui-monospace,monospace;margin-top:7px}
.toc nav{display:block;max-height:none;overflow:visible;padding-top:8px}
.toc-group{display:block}
.toc-section{margin-left:9px}
.toc-section-title{display:block;color:var(--muted);font:600 11px/1.5 system-ui;padding:8px 5px 3px}
.toc a{min-width:0;word-break:normal}
@media(max-width:760px){.guide-body{display:block}.guide-body>.toc{border-right:0;border-bottom:1px solid var(--rule)}}
@media print{.guide-body{display:block}.guide-body>.toc{display:none}}
.component-detail{display:flex;flex-direction:column;flex:1;min-height:0}
.component-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;padding:19px 24px;border-bottom:1px solid var(--rule);flex:none}
.component-head h2{font:500 clamp(20px,2vw,26px)/1.25 system-ui;letter-spacing:-.035em;margin:5px 0 0}
.component-head button{white-space:nowrap;border:1px solid var(--rule);border-radius:3px;background:transparent;padding:7px 10px;font-size:11px}
.component-scroll{overflow:auto;min-height:0;flex:1;padding:20px 28px 36px;scrollbar-gutter:stable;overscroll-behavior:contain}
.component-scroll h3{font:600 16px/1.4 system-ui;margin:26px 0 12px}
.component-scroll p{margin:0 0 16px}
.component-scroll .cv-lab,.component-scroll .path-lab,.component-scroll .lidar-lab,.component-scroll .arch-lab{display:none}
.path-lab,.cv-lab,.arch-lab{border:1px solid var(--rule);background:var(--paper);padding:14px;margin:20px 0 24px;border-radius:4px}
.path-toolbar,.path-actions,.cv-toolbar{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-bottom:12px}
.path-toolbar button,.path-actions button,.cv-toolbar button{background:transparent;border:1px solid var(--rule);padding:7px 9px;border-radius:3px;font:11px/1.5 ui-monospace,monospace}
.path-toolbar button[aria-pressed="true"]{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.path-actions label,.cv-toolbar label{font:11px/1.5 ui-monospace,monospace;color:var(--muted);display:flex;align-items:center;gap:5px}
.path-actions input,.cv-toolbar input[type=range]{max-width:85px;accent-color:var(--ink)}
.cv-toolbar input[type=file]{max-width:180px;font:10px/1.4 ui-monospace,monospace}
.path-grid{display:grid;gap:2px;width:100%;max-width:600px;background:var(--rule);padding:2px;border-radius:2px}
.path-cell{aspect-ratio:1/1;min-width:0;min-height:0;padding:0!important;margin:0!important;border:0!important;border-radius:1px;background:var(--paper);color:var(--ink);font:700 clamp(8px,1vw,11px)/1 ui-monospace,monospace;cursor:crosshair}
.path-cell.explored{background:color-mix(in srgb,var(--signal) 9%,var(--paper))}
.path-cell.path{background:color-mix(in srgb,#408a9f 32%,var(--paper))}
.path-cell.wall{background:var(--ink)}
.path-cell.start{background:#83b9a1;color:#142d20}
.path-cell.goal{background:#e3b76b;color:#3e2504}
.path-cell.drone{box-shadow:inset 0 0 0 2px var(--ink);color:var(--ink);font-size:16px}
.path-cell:hover{outline:2px solid var(--ink);outline-offset:-1px}
.path-legend{display:flex;flex-wrap:wrap;gap:7px 12px;color:var(--muted);font:10px ui-monospace,monospace}
.lab-status{font:12px/1.5 ui-monospace,monospace;min-height:3.5em;margin:12px 0!important;padding:8px 10px;background:var(--code)}
.cv-canvases{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.cv-canvases figure{margin:0;min-width:0}
.cv-canvases canvas{width:100%;height:auto;display:block;aspect-ratio:300/190;border:1px solid var(--rule)}
.cv-canvases figcaption{font:10px/1.5 ui-monospace,monospace;color:var(--muted);padding-top:6px}
.arch-lab{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px}
.arch-graph{display:flex;flex-direction:column;gap:0}
.arch-node button{display:flex;flex-direction:column;gap:3px;background:var(--code);border:1px solid var(--rule);border-radius:3px;width:100%;text-align:left;padding:10px 12px;min-width:0;color:var(--ink);font-size:11px}
.arch-node button[aria-pressed="true"]{border-color:var(--ink);box-shadow:inset 3px 0 0 var(--ink)}
.arch-node small{color:var(--muted);font:10px/1.4 ui-monospace,monospace}
.arch-arrow{display:block;text-align:center;color:var(--muted);font-size:16px;line-height:1.2}
.arch-info{align-self:start;position:sticky;top:0;padding:13px;border:1px solid var(--rule);overflow-wrap:anywhere;font-size:12px}
.arch-info h3{margin:0 0 12px;font-size:15px}
.arch-info p{margin:0 0 12px}
.arch-info code{white-space:normal}
@media(max-width:1100px) and (min-width:761px){.guide-layout{gap:8px}.reading-pane{padding:20px 16px}.panel-toolbar{padding:15px}.toc nav{grid-template-columns:1fr}}
@media(max-width:760px){
  .guide-layout{display:block}.layout-splitter{display:none}
  .topic-tabs{gap:4px}.topic-tabs a{padding:6px 8px}
  .guide-panel{height:auto;max-height:none;min-height:0}
  .component-detail{min-height:400px}.component-scroll{padding:18px 16px;max-height:75dvh}
  .camera-controls{padding:8px}.camera-controls button{font-size:10px}
  .path-cell{font-size:9px}.cv-canvases{grid-template-columns:1fr 1fr}
  .arch-lab{grid-template-columns:1fr}.arch-info{position:static}
}
@media print{.topic-tabs,.layout-splitter,.camera-controls,.component-detail{display:none!important}.path-lab,.cv-lab{break-inside:avoid}}

/* Study checkpoints, distinct from simply opening a chapter. */
.study-actions{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:26px 0 12px;padding:13px 0;border-top:1px solid var(--rule)}
.study-actions button,.self-check>button,.path-scenarios button,.path-sharing button{font:11px/1.4 ui-monospace,monospace;padding:8px 11px;border:1px solid var(--rule);border-radius:3px;background:transparent;color:var(--ink);cursor:pointer}
.study-actions button[aria-pressed="true"]{background:var(--code);border-color:var(--signal)}
.study-actions small{font:10px/1.4 ui-monospace,monospace;color:var(--muted)}
.self-check{margin:26px 0;border:1px solid var(--rule);border-radius:4px;padding:16px}
.self-check h3{font:600 16px/1.3 system-ui;margin:0 0 8px}
.self-check p{color:var(--muted);font-size:12px;margin:0 0 14px}
.self-check fieldset{padding:10px 12px;margin:0 0 14px;border:1px solid var(--rule);min-width:0}
.self-check legend{font:600 12px/1.5 system-ui;padding:0 4px}
.self-check label{display:flex;align-items:baseline;gap:8px;margin:8px 0;font:12px/1.5 system-ui;cursor:pointer}
.self-check label input{flex:none;accent-color:var(--signal)}
.self-check label>span{min-width:0;overflow-wrap:anywhere}
.self-check [data-check-result]{display:block;white-space:pre-line;line-height:1.65;font:11px/1.65 ui-monospace,monospace;color:var(--ink);background:var(--code);margin-top:12px;padding:9px 11px;border-radius:3px}
.path-scenarios{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:12px}
.path-scenarios label{font:11px/1.6 ui-monospace,monospace;color:var(--muted)}
.path-scenarios select{margin-left:5px;padding:7px 8px;max-width:190px;border:1px solid var(--rule);border-radius:3px;background:var(--paper);color:var(--ink);font:11px ui-monospace,monospace}
.path-stats{color:var(--muted);font:11px/1.6 ui-monospace,monospace;margin:8px 0 12px!important}
.path-sharing{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-start}
.path-sharing details{flex:1 1 210px;min-width:0;font:11px/1.5 ui-monospace,monospace}
.path-sharing summary{padding:8px 0;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.path-sharing p,.path-tip{color:var(--muted);font:10px/1.6 ui-monospace,monospace}
.path-sharing textarea{width:100%;box-sizing:border-box;display:block;resize:vertical;margin:7px 0 9px;padding:9px;border:1px solid var(--rule);border-radius:3px;background:var(--code);color:var(--ink);font:10px/1.5 ui-monospace,monospace}
.path-tip{margin:12px 0 0!important}
.path-cell:focus-visible{outline:2px solid var(--signal);outline-offset:-2px;z-index:1}
@media(max-width:760px){.self-check{padding:12px}.path-scenarios{align-items:flex-start}.path-sharing{display:block}}
@media print{.self-check button,.study-actions,.path-sharing,.path-scenarios{display:none!important}.self-check{break-inside:avoid}}

/* Indoor 2D LiDAR teaching canvas; visual system consistent with the existing labs. */
.lidar-lab{border:1px solid var(--rule);background:var(--paper);padding:14px;margin:20px 0 24px;border-radius:4px}
.lidar-toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.lidar-toolbar label{font:11px/1.5 ui-monospace,monospace;display:flex;align-items:center;gap:6px;color:var(--muted)}
.lidar-toolbar input{max-width:85px;accent-color:var(--signal)}
.lidar-toolbar output{min-width:32px;font:11px ui-monospace,monospace}
.lidar-toolbar button{background:transparent;border:1px solid var(--rule);padding:7px 9px;border-radius:3px;font:11px/1.5 ui-monospace,monospace}
.lidar-lab canvas{display:block;width:100%;height:auto;border:1px solid var(--rule);cursor:crosshair;touch-action:manipulation}
.lidar-caption{font:10px/1.6 ui-monospace,monospace;color:var(--muted);margin:8px 0 0!important}
@media print{.lidar-lab{break-inside:avoid}}
.handbook-entry{margin-left:auto;border:1px solid var(--ink);border-radius:3px;padding:8px 12px;text-decoration:none;font:11px/1.4 ui-monospace,monospace;white-space:nowrap}
.handbook-entry:hover,.component-more:hover{background:var(--code)}
.masthead .handbook-entry+.theme-link{margin-left:0}
.atlas-overview{flex:1}
.atlas-overview h2,.handbook-intro h2{font:500 clamp(25px,2.25vw,34px)/1.15 system-ui;letter-spacing:-.04em;margin:10px 0 20px}
.atlas-overview>p{max-width:62ch;color:var(--muted)}
.component-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;list-style:none;padding:0;margin:24px 0}
.component-list li{display:flex;flex-direction:column;gap:7px;border:1px solid var(--rule);padding:12px;min-width:0}
.component-list strong{font-size:13px}
.component-list span{color:var(--muted);font-size:12px;line-height:1.5}
.component-list a{font:11px/1.5 ui-monospace,monospace;margin-top:auto}
.component-more{display:inline-block;border:1px solid var(--rule);border-radius:3px;padding:8px 12px;text-decoration:none;font:11px/1.4 ui-monospace,monospace}
.handbook-layout{max-width:1480px;margin:28px auto 0;display:grid;grid-template-columns:minmax(250px,300px) minmax(0,1fr);gap:44px;align-items:start}
.handbook-sidebar{position:sticky;top:20px;max-height:calc(100dvh - 40px);overflow:auto;border:1px solid var(--rule);border-radius:5px;background:var(--paper);padding:18px}
.handbook-contents-link{display:block;font:600 13px/1.4 system-ui;text-decoration:none}
.handbook-progress{color:var(--muted);font:10px/1.5 ui-monospace,monospace;margin:6px 0 15px}
.handbook-group{border-top:1px solid var(--rule)}
.handbook-group summary{display:flex;align-items:baseline;gap:8px;padding:11px 0;cursor:pointer;font:600 12px/1.4 system-ui}
.handbook-group-number{font:10px/1.4 ui-monospace,monospace;color:var(--muted)}
.handbook-group summary small{margin-left:auto;white-space:nowrap;color:var(--muted);font:9px/1.4 ui-monospace,monospace}
.handbook-section{padding:0 0 10px 20px}
.handbook-section strong{display:block;color:var(--muted);font:600 10px/1.5 ui-monospace,monospace;padding:7px 0 4px}
.handbook-section a{display:block;padding:5px 8px;text-decoration:none;font:12px/1.4 system-ui;border-radius:3px}
.handbook-section a:hover,.handbook-section a[aria-current]{background:var(--code)}
.handbook-section a[aria-current]{font-weight:650}
.handbook-section a.read:after{content:' ✓';color:var(--muted)}
.handbook-section a.active{background:var(--code);font-weight:650;border-left:2px solid var(--signal);padding-left:6px}
.handbook-section h3 a{font:inherit;color:inherit;text-decoration:none}
.handbook-section h3 a:hover{color:var(--ink)}
.chapter-part{scroll-margin-top:16px}
.chapter-part,.chapter-part p,.chapter-part li,.chapter-part td,.chapter-part th,.chapter-part .note,.chapter-part .self-check{font-weight:400}
html{scroll-behavior:auto}
.handbook-main{min-width:0;max-width:900px}
.handbook-breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;color:var(--muted);font:11px/1.4 ui-monospace,monospace;margin-bottom:30px}
.handbook-main .chapter{background:var(--paper);border:1px solid var(--rule);border-radius:5px;padding:34px 40px}
.handbook-main .chapter h2{margin-bottom:25px}
.handbook-pager{display:flex;justify-content:space-between;gap:20px;margin:22px 0 40px}
.handbook-pager a{display:flex;flex-direction:column;gap:4px;max-width:48%;text-decoration:none;border:1px solid var(--rule);border-radius:3px;padding:12px 16px}
.handbook-pager a:last-child{text-align:right;margin-left:auto}
.handbook-pager small{color:var(--muted);font:10px/1.4 ui-monospace,monospace}
.handbook-pager span{font-size:12px}
.handbook-intro{max-width:780px;padding:24px 0}
.handbook-intro p{color:var(--muted);max-width:70ch}
.handbook-catalog{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding-bottom:45px}
.handbook-catalog>a{display:flex;flex-direction:column;min-height:150px;border:1px solid var(--rule);border-radius:4px;background:var(--paper);padding:18px 20px;text-decoration:none}
.handbook-catalog>a:hover{border-color:var(--ink)}
.handbook-catalog h3{font:500 19px/1.25 system-ui;letter-spacing:-.02em;margin:8px 0}
.handbook-catalog p{color:var(--muted);font-size:12px;line-height:1.5;margin:0 0 20px}
.catalog-action{font:11px/1.4 ui-monospace,monospace;margin-top:auto}
@media(max-width:1000px){.handbook-layout{gap:20px;grid-template-columns:minmax(210px,250px) minmax(0,1fr)}.handbook-main .chapter{padding:28px}}
@media(max-width:760px){.masthead .handbook-entry{font-size:10px;padding:6px 8px;white-space:normal}.component-list{grid-template-columns:1fr}.handbook-layout{display:block;margin-top:18px}.handbook-sidebar{position:static;max-height:280px;margin-bottom:18px}.handbook-main .chapter{padding:22px 18px}.handbook-catalog{grid-template-columns:1fr}}
@media print{.handbook-sidebar,.handbook-entry,.handbook-pager{display:none}.handbook-layout{display:block}.handbook-main .chapter{border:0;padding:0}}
.home-masthead{min-height:88px}
.home-masthead .brand{display:block;max-width:none;font:600 22px/1 system-ui;letter-spacing:-.045em}
.theme-link{display:inline-flex;align-items:center;justify-content:center;flex:none;width:36px;height:36px;border:1px solid var(--rule);border-radius:50%;text-decoration:none;color:var(--ink)}
.theme-link:hover{background:var(--code);border-color:var(--ink)}
.theme-link svg{display:block;width:18px;height:18px;fill:currentColor}
.component-list li{gap:10px;padding:16px}
.component-list span{font-size:13px;line-height:1.6}
.handbook-progress{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0 0 15px;padding:10px 12px;border:1px solid var(--rule);border-radius:4px;background:var(--code);color:var(--ink);font:11px/1.4 ui-monospace,monospace;font-variant-numeric:tabular-nums}
.handbook-progress strong{font-weight:650}
.handbook-progress [data-read-count]{margin:0;color:inherit;font:inherit}
.handbook-contents-link{margin-bottom:12px}
.study-actions button{display:inline-flex;align-items:center;gap:9px}
.study-status{display:inline-grid;place-items:center;flex:none;width:17px;height:17px;border:2px solid #27864e;border-radius:50%;color:#fff;font:700 11px/1 system-ui}
.study-actions button[aria-pressed="true"] .study-status{background:#27864e}
.study-actions button[aria-pressed="true"] .study-status::after{content:'✓'}
@media(max-width:760px){.home-masthead{min-height:72px}.home-masthead .brand{font-size:19px}.theme-link{width:32px;height:32px}.theme-link svg{width:16px;height:16px}}
body.iso{--progress-green:#187d45}
body.iso[data-theme="dark"]{--progress-green:#67d794}
.handbook-masthead{min-height:112px;gap:22px}
.handbook-masthead h1{font-size:clamp(26px,2.5vw,36px)}
.handbook-progress-donut{position:relative;display:grid;place-items:center;width:84px;height:84px;flex:none;font-variant-numeric:tabular-nums}
.handbook-progress-donut svg{display:block;width:100%;height:100%}
.handbook-progress-donut circle{fill:none;stroke-width:7}
.handbook-progress-donut .progress-track{stroke:var(--rule)}
.handbook-progress-donut .progress-ring{stroke:var(--progress-green);stroke-linecap:round;stroke-dasharray:0 100;transform:rotate(-90deg);transform-origin:50% 50%;transition:stroke-dasharray .35s ease}
.progress-fraction{position:absolute;display:flex;align-items:baseline;gap:1px;font:11px/1 ui-monospace,monospace;color:var(--muted)}
.progress-fraction strong{font-size:17px;color:var(--progress-green)}
.handbook-group-progress{font-variant-numeric:tabular-nums}
.handbook-group-progress [data-group-read]{color:var(--progress-green);font-weight:700}
.catalog-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}
.catalog-heading .handbook-group-progress{white-space:nowrap;color:var(--muted);font:11px/1.4 ui-monospace,monospace}
@media(max-width:760px){.handbook-masthead{min-height:88px;flex-wrap:wrap;gap:12px;padding:12px 0}.handbook-progress-donut{width:62px;height:62px}.handbook-masthead h1{font-size:24px}}
@media(prefers-reduced-motion:reduce){.handbook-progress-donut .progress-ring{transition:none}}
.camera-controls{position:absolute;z-index:20;top:8px;left:8px;max-width:calc(100% - 16px);padding:7px;background:color-mix(in srgb,var(--paper) 90%,transparent);border:1px solid var(--rule);border-radius:4px;backdrop-filter:blur(6px)}
.handbook-group-heading{display:flex;align-items:baseline;gap:9px;margin:0;padding:14px 0 9px;font:700 16px/1.4 system-ui}
.handbook-group-heading .handbook-group-number{font-size:11px}
.handbook-group-heading .handbook-group-progress{margin-left:auto;white-space:nowrap;color:var(--muted);font:11px/1.4 ui-monospace,monospace}
.handbook-group>summary.handbook-group-heading{list-style:none;cursor:pointer;align-items:center;padding:14px 0 9px;font:700 16px/1.4 system-ui}
.handbook-group>summary::-webkit-details-marker{display:none}
.handbook-group-arrow{width:7px;height:7px;flex:none;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg);transition:transform .2s ease}
.handbook-group[open] .handbook-group-arrow{transform:rotate(225deg)}
.handbook-group>summary:hover{color:var(--signal)}
.handbook-group>summary:focus-visible{outline:2px solid var(--signal);outline-offset:2px}
.handbook-section{padding:0 0 12px 14px}
.handbook-section h3{margin:7px 0 5px;color:var(--ink);font:700 15px/1.4 system-ui}
.handbook-section a{padding:7px 8px;font-size:13px;line-height:1.45}
.handbook-section a.read:after,.toc a.read:after{color:var(--progress-green);font-weight:700}
.callouts button{visibility:hidden;pointer-events:none;transform:translate(calc(-100% - 6px),-50%);transition:opacity .24s ease,transform .24s ease,visibility .24s}
.callouts button[data-side="right"]{transform:translate(26px,-50%)}
.stage[data-phase="apart"] .callouts button{visibility:visible;pointer-events:auto;transform:translate(-100%,-50%)}
.stage[data-phase="apart"] .callouts button[data-side="right"]{transform:translate(20px,-50%)}
.hovercard:not([hidden]){animation:surface-enter .2s ease-out both}
.modal-backdrop:not([hidden]) .modal-card{animation:surface-enter .25s ease-out both}
.handbook-entry,.theme-link,.component-more,.camera-controls button,.controls button,.component-head button,.handbook-section a,.handbook-catalog>a,.handbook-pager a,.study-actions button{transition:background-color .2s ease,border-color .2s ease,color .2s ease,transform .2s ease,box-shadow .2s ease}
.handbook-catalog>a:hover,.handbook-pager a:hover{transform:translateY(-2px)}
.controls button:hover,.component-head button:hover,.study-actions button:hover{background:var(--code)}
@keyframes surface-enter{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){.callouts button,.handbook-entry,.theme-link,.component-more,.camera-controls button,.controls button,.component-head button,.handbook-section a,.handbook-catalog>a,.handbook-pager a,.study-actions button{transition:none}.hovercard:not([hidden]),.modal-backdrop:not([hidden]) .modal-card{animation:none}}

/* Course reading rhythm: one comfortable text column and clear chapter boundaries. */
.handbook-main{max-width:840px}
.handbook-main .chapter{padding:42px clamp(24px,5vw,64px)}
.handbook-main .chapter-part{font-size:16px;line-height:1.72;overflow-wrap:break-word}
.handbook-main .chapter-part>p,.handbook-main .chapter-part>ul,.handbook-main .chapter-part>ol,.handbook-main .chapter-part>.note{max-width:72ch}
.handbook-main .chapter-part a:not(.equation-number){text-decoration-thickness:1px;text-underline-offset:3px}
.handbook-main .chapter-part+ .chapter-part{border-top:1px solid var(--rule);margin-top:54px;padding-top:50px}
.handbook-main .chapter-part h2{font-size:clamp(28px,3vw,36px);line-height:1.2;margin:9px 0 26px}
.handbook-main .chapter-part h3{font-size:21px;line-height:1.35;margin:38px 0 14px}
.handbook-main .chapter-part h3::before{content:"";display:block;width:30px;height:2px;background:var(--signal);margin-bottom:14px}
.handbook-main .chapter-part p{margin:0 0 21px}
.handbook-main .chapter-part li{margin-bottom:9px}
.handbook-main .chapter-part ul,.handbook-main .chapter-part ol{margin:0 0 22px;padding-left:24px}
.handbook-main .chapter-part .note{font-size:15px;line-height:1.65}
.handbook-main .chapter-part .code-block pre{font-size:12px;line-height:1.65}
.handbook-main .chapter-part table{font-size:14px;line-height:1.5}
.handbook-main .chapter-part th{font-weight:600}
.handbook-main .chapter-part .footnote p{margin:0 0 8px;line-height:1.6}
.handbook-main .chapter-part .footnote li{margin-bottom:8px}
.handbook-main .chapter-part .footnote li:last-child p{margin-bottom:0}
.handbook-main .chapter-part .footnote a{overflow-wrap:anywhere}
.handbook-main .chapter>.self-check{margin-top:54px;padding:26px 28px;border-radius:6px;background:var(--code)}
.handbook-main .chapter>.self-check h3{font-size:20px;margin-bottom:10px}
.handbook-main .chapter>.self-check p{font-size:14px;line-height:1.6}
.handbook-main .chapter>.self-check legend,.handbook-main .chapter>.self-check label{font-size:14px;line-height:1.55}
@media(max-width:760px){.handbook-main .chapter{padding:26px 20px}.handbook-main .chapter-part{font-size:15px;line-height:1.67}.handbook-main .chapter-part+ .chapter-part{margin-top:38px;padding-top:34px}.handbook-main .chapter-part h3{font-size:19px}}
.handbook-main .equation{position:relative;display:flex;justify-content:center;align-items:center;min-height:3.5em;margin:24px 0 30px;padding:12px 46px;scroll-margin-top:24px}
.handbook-main .equation-math{display:block;max-width:100%;overflow-x:auto;white-space:pre-wrap;text-align:center;line-height:1.7}
.handbook-main .equation-math .katex-display{margin:0;overflow-x:auto;overflow-y:hidden}
.handbook-main .equation-number{position:absolute;right:0;top:50%;transform:translateY(-50%);font:14px/1.4 ui-monospace,monospace;color:var(--muted);text-decoration:none}
.handbook-main .equation-number:hover{color:var(--ink);text-decoration:underline}
@media(max-width:760px){.handbook-main .equation{padding:10px 34px}.handbook-main .equation-number{font-size:12px}.handbook-main .chapter>.self-check{padding:20px 16px}}
/* Shared account disclosure and control states. */
.account-menu{position:relative;flex:none;font:14px/1.5 system-ui;z-index:20}
.account-menu>summary{display:flex;align-items:center;gap:8px;list-style:none;cursor:pointer;border:1px solid var(--rule);border-radius:8px;padding:10px 12px;min-height:44px;background:var(--paper);color:var(--ink)}
.account-menu>summary::-webkit-details-marker{display:none}.account-name{max-width:120px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.account-panel{position:absolute;right:0;top:calc(100% + 8px);min-width:210px;max-width:calc(100vw - 32px);background:var(--paper);border:1px solid var(--rule);border-radius:8px;padding:16px;box-shadow:0 8px 24px #0002;color:var(--ink)}
.account-panel strong{display:block;overflow-wrap:anywhere}.account-panel a{display:block;margin-top:14px}.account-panel button{width:100%;min-height:44px;margin-top:14px;border:1px solid var(--rule);border-radius:6px;background:var(--code);color:var(--ink);font:inherit;cursor:pointer}
button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible{outline:2px solid var(--signal);outline-offset:3px}
@media(max-width:540px){.account-name{display:none}.account-menu>summary{padding:8px 12px}}