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.reference-quick-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.reference-quick-card,.reference-highlight-card{display:block;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px;transition:transform .18s,box-shadow .18s,border-color .18s}.reference-quick-card:hover,.reference-highlight-card:hover{transform:translateY(-3px);border-color:#9bb091;box-shadow:0 8px 22px #24483c12}.reference-quick-card>span{font:10px var(--mono);color:var(--green);letter-spacing:1px}.reference-quick-card strong{display:block;font-size:16px;margin:9px 0 5px}.reference-quick-card p,.reference-highlight-card p{font-size:12px;color:var(--muted);line-height:1.7;margin:0 0 13px}.reference-quick-card b,.reference-highlight-card small{font-size:11px;color:var(--green)}.reference-highlight-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.reference-highlight-card{padding:15px}.reference-highlight-card strong{font-size:13px;line-height:1.55;display:block}.reference-highlight-card p{font-size:11px;margin:7px 0 13px}@media(max-width:800px){.reference-quick-grid{grid-template-columns:1fr 1fr}.reference-highlight-grid{grid-template-columns:1fr 1fr}}@media(max-width:520px){.reference-quick-grid,.reference-highlight-grid{grid-template-columns:1fr}}
.nav-featured{border:1px solid #bfd39f;background:#edf4e5;border-radius:9px;padding:8px 7px;margin:12px -4px}.nav-featured h3{color:#285b45!important}

.nav-section-link{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 10px;border-radius:7px;text-decoration:none;color:var(--ink);font-size:13px}.nav-section-link small{font:10px var(--mono);color:var(--muted)}.nav-section-link:hover,.nav-section-link.active{background:var(--soft);color:var(--green)}.nav-featured .nav-section-link{background:#dfead5;color:#285b45;font-weight:650}.section-topics{margin-top:30px}
.nav-section{margin:7px 0;border-radius:8px}.nav-section summary{display:flex;align-items:center;justify-content:space-between;gap:8px;cursor:pointer;list-style:none;padding:12px 10px;color:var(--ink);font-size:13px}.nav-section summary::-webkit-details-marker{display:none}.nav-section summary:before{content:'›';display:inline-block;color:var(--muted);font-size:18px;line-height:10px;transition:transform .15s}.nav-section[open] summary:before{transform:rotate(90deg)}.nav-section summary span{flex:1}.nav-section summary small{font:10px var(--mono);color:var(--muted)}.nav-section summary:hover{background:var(--soft)}.nav-featured{border:1px solid #bfd39f;background:#edf4e5;padding:3px}.nav-featured summary{color:#285b45;font-weight:650}.nav-children{padding:0 6px 7px 13px;border-left:1px solid var(--line);margin-left:15px}.nav-children .nav-lesson{margin:2px 0}.home-three-feature{display:grid;grid-template-columns:minmax(0,1fr) minmax(360px,1.15fr);gap:20px;align-items:stretch}.home-three-copy{min-width:0}.home-three-stage{position:relative;min-height:270px}.home-three-stage .three-slot{height:100%;margin:0;min-height:270px}.home-three-stage .three-slot:not([hidden]){min-height:270px}.three-badge{position:absolute;z-index:2;top:12px;right:12px;padding:5px 9px;border:1px solid #78946c;border-radius:5px;background:#14271fdd;color:#d7edb8;font:10px var(--mono)}@media(max-width:800px){.home-three-feature{grid-template-columns:1fr}.home-three-stage{min-height:240px}.home-three-stage .three-slot:not([hidden]){min-height:240px}}

/* 2026-09-24 visual pass: readable active navigation and calmer documentation palette */
:root{
  --paper:#f7f9f8;
  --ink:#20352f;
  --muted:#60736b;
  --line:#d6e2dc;
  --green:#21634d;
  --soft:#e7f1eb;
  --accent:#c6eadb;
  --focus:#2d7dd2;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
body{background:var(--paper);color:var(--ink)}
.topbar{background:rgba(247,249,248,.97);border-color:var(--line)}
.sidebar{background:#f1f6f3;border-color:var(--line)}
.brand-mark,.button.primary,.nav-lesson.active,.toast{background:var(--green);border-color:var(--green)}
.brand-mark{box-shadow:0 5px 16px rgba(33,99,77,.16)}
.search-open,.exercise,.reference-quick-card,.reference-highlight-card{background:#fff;border-color:var(--line)}
.search-open kbd{background:#e9f0ec;color:var(--green)}
.button{background:#fff;border-color:#bfd1c8;color:var(--ink)}
.button.primary:hover{background:#174f3d;border-color:#174f3d}
.button:hover{border-color:#8fb5a6;background:#f7fbf8;filter:none}
.nav-lesson{color:#415d52;font-size:13px;min-height:38px;align-items:baseline;}
.nav-num{color:#526e63;opacity:1;font-size:11px;}
.nav-lesson > span:last-child{min-width:0;overflow-wrap:anywhere;}
.nav-section summary:focus-visible{outline:3px solid var(--focus);outline-offset:2px;border-radius:6px;}
.nav-lesson:hover,.overview-link:hover,.nav-section summary:hover{background:#e1eee7}
.nav-lesson.active,
.nav-featured .nav-lesson.active{color:#fff;background:#21634d;font-weight:600;text-shadow:none}
.nav-lesson.active:hover,.nav-featured .nav-lesson.active:hover{background:#174f3d;color:#fff}
.nav-lesson.active .nav-num,.nav-featured .nav-lesson.active .nav-num{color:#c6eadb;opacity:1}
.nav-featured{background:#edf5ef;border-color:#b8d6c5}
.nav-featured summary{color:#1e5c47}


.nav-children{border-color:#c6d9cf}
.article-section p{color:#435d53}
.section-index{color:#526e63}
.code-block{background:#edf4f0;border-color:#cbdcd3}
.code-header{border-color:#cbdcd3;color:#557267}
.note{background:#fff7e6;border-color:#eedfb9;color:#6b5835}
.note strong{color:#795e2b}
.sources{border-color:var(--line)}
.sources a,.reference-quick-card>span,.reference-quick-card b,.reference-highlight-card small{color:#1d6b53}
.stage-heading{border-color:var(--line)}
.home-title em{color:#1d6b53}
.home-feature{background:#183b30;border-color:#2c6452}
.home-feature>small{color:var(--accent)}
.home-feature p{color:#c4d9ce}
.home-node{background:#204a3b;border-color:#4e806c}
.home-node.highlight{color:var(--accent);border-color:var(--accent)}
.home-flow>span{color:var(--accent)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline-color:var(--focus)}
#search-input{border-color:#b7cdc2;background:#fff}
.toc a:hover{color:#1d6b53;border-color:#1d6b53}
.pill{background:#e2efe8;color:#1d6b53}
.pill.outline{background:transparent;border:1px solid #9fc4b2}
.lesson-footer{border-color:var(--line)}
.progress-track{background:#dce9e2}.progress-track>span{background:#2c765b}
.download-link{color:#1d6b53}

/* Explicit surface foregrounds keep button text readable inside dark callouts. */
.home-feature .button{background:#eef5f1;color:#20352f;border-color:#bdd3c7;}
.home-feature .button:hover{background:#dcece4;color:#20352f;}
.home-feature .button.primary{background:var(--green);color:#fff;border-color:#7fb49e;}
.home-feature .button.primary:hover{background:#174f3d;color:#fff;}
.toc-label{color:var(--muted);}
.code-block pre{font-size:13px;}
.nav-featured{background:#eaf1ed;border-color:#c4d9ce;}
@media(max-width:800px){.nav-lesson{min-height:44px;}.code-block pre{font-size:12px;}}

/* Full execution atlas: restrained controls around a real depth-lit Three.js scene. */
body.flow-page .page{grid-template-columns:minmax(0,1280px);padding-left:30px;padding-right:30px;}
body.flow-page .toc{display:none;}
.flow-experience{--flow-text:#eaf5fa;--flow-muted:#a6bec9;--flow-line:#29424f;--flow-accent:#82e5c7;color:var(--flow-text);background:#0c1c27;border:1px solid #2c4552;border-radius:18px;overflow:hidden;box-shadow:0 25px 65px #18372c1f;margin:30px 0 48px;font-size:14px;}
.flow-experience *{box-sizing:border-box;}
.flow-experience button,.flow-experience select{font:500 12px/1.45 var(--sans);color:var(--flow-text);background:#1a303d;border:1px solid #425966;border-radius:7px;min-height:38px;padding:8px 13px;}
.flow-experience button:hover:not(:disabled){background:#254858;border-color:#80b5be;}
.flow-experience button:disabled{opacity:.4;}
.flow-experience button:focus-visible,.flow-experience select:focus-visible,.flow-experience input:focus-visible,.flow-experience canvas:focus-visible{outline:3px solid #a9f0dc;outline-offset:-3px;}
.flow-experience button[aria-pressed=true]{background:#234f48;border-color:#82e5c7;color:#cffff1;}
.flow-experience [hidden]{display:none!important;}
.flow-mast{padding:28px 30px 22px;display:flex;justify-content:space-between;gap:18px;align-items:center;background:linear-gradient(115deg,#193744,#0e252d 65%,#163c36);}
.flow-mast .flow-kicker{font:10px var(--mono);color:#9de8d0;letter-spacing:2px;margin:0 0 12px;}
.flow-mast h2{color:#f0fafc;font-size:29px;font-weight:650;margin:0 0 8px;letter-spacing:-.035em;}
.flow-mast p{font-size:13px;color:#bfd2d9;margin:0;}
.flow-version{font:11px/1.9 var(--mono);color:#bbd7d7;white-space:nowrap;text-align:right;border-left:1px solid #416168;padding-left:18px;}
.flow-scenario-row{display:flex;align-items:center;gap:22px;padding:17px 26px;border-bottom:1px solid var(--flow-line);}
.flow-scenario-row label{display:flex;flex-direction:column;gap:6px;font:10px var(--mono);color:var(--flow-muted);min-width:235px;}
.flow-scenario-row select{width:100%;}
.flow-scenario-row p{font-size:12px;line-height:1.8;color:var(--flow-muted);margin:0;}
.flow-viewport-wrap{position:relative;background:#08151d;border-bottom:1px solid var(--flow-line);}
.flow-scene{height:clamp(450px,46vw,650px);width:100%;min-width:0;}
.flow-scene canvas{width:100%;height:100%;display:block;touch-action:none;cursor:grab;}
.flow-scene-top{position:absolute;inset:20px 24px auto;display:flex;justify-content:space-between;pointer-events:none;gap:12px;color:#c0d5df;font:10px/1.5 var(--mono);letter-spacing:1px;}
.flow-scene-top i{display:inline-block;width:6px;height:6px;border-radius:50%;background:#86e5be;margin-right:6px;box-shadow:0 0 12px #86e5be;}
.flow-scene-top [data-flow-phase]{border:1px solid #385867;padding:3px 10px;background:#102631dd;border-radius:20px;color:#c1eadc;}
.flow-scene-tools{position:absolute;left:22px;top:52px;display:flex;gap:7px;flex-wrap:wrap;max-width:calc(100% - 44px);}
.flow-scene-tools button{background:#112735e6;border-color:#375967;backdrop-filter:blur(8px);font-size:11px;}
.flow-scene-legend{position:absolute;bottom:42px;left:24px;display:flex;gap:16px;flex-wrap:wrap;color:#c2d5de;font-size:10px;pointer-events:none;}
.flow-scene-legend i{display:inline-block;width:7px;height:7px;border-radius:2px;margin-right:6px;}
.flow-scene-legend .application{background:#76caff}.flow-scene-legend .framework{background:#74e2c3}.flow-scene-legend .provider{background:#c3a2ff}.flow-scene-legend .optional{background:#ffc77e}
.flow-scene-help{position:absolute;bottom:17px;left:24px;font-size:10px;color:#96b3c0;pointer-events:none;}
.flow-loading{position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:40px;color:#cce4e9;background:#08151de6;pointer-events:none;}
.flow-player{display:flex;align-items:center;gap:18px;justify-content:space-between;padding:18px 24px 8px;}
.flow-player-buttons{display:flex;gap:7px;}
.flow-player .flow-play{background:#83e0c4;color:#102b28;border-color:#83e0c4;min-width:100px;font-weight:650;}
.flow-player .flow-play:hover{background:#b5f9e2;color:#102b28;}
.flow-player>[data-flow-position]{font:12px var(--mono);color:#abc4d0;margin-left:auto;white-space:nowrap;}
.flow-player>label{display:flex;align-items:center;gap:8px;font-size:11px;color:#b4cbd5;}
.flow-timeline{padding:0 24px 18px;}
.flow-timeline input{width:100%;height:22px;accent-color:#83e0c4;cursor:pointer;}
.flow-timeline>[data-flow-ticks]{display:flex;gap:4px;overflow-x:auto;padding-bottom:4px;}
.flow-timeline button{flex:1 0 30px;padding:3px;min-height:29px;font:10px var(--mono);background:#132936;border-color:transparent;color:#a0bac6;}
.flow-timeline button.passed{background:#183d3b;color:#91d3c1;}
.flow-timeline button.current{border-color:#83e0c4;background:#224e45;color:#edfff9;}
.flow-detail-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--flow-line);}
.flow-explanation{padding:25px;min-width:0;}
.flow-step-heading{display:flex;gap:14px;align-items:start;}
.flow-step-heading>span{font:29px var(--mono);line-height:1.35;color:#83e0c4;}
.flow-step-heading p{font:10px var(--mono);color:#9db9c6;margin:0 0 4px;}
.flow-step-heading h3{font-size:18px;font-weight:650;line-height:1.6;margin:0;color:#ecf8fb;letter-spacing:0;}
.flow-description{font-size:13px;line-height:1.85;color:#b6cdd7;min-height:72px;margin:16px 0;}
.flow-payload{padding:12px 14px;background:#102632;border:1px solid #314b58;border-radius:9px;}
.flow-payload>span{font-size:10px;color:#a6c5d2;}
.flow-payload pre{font:12px/1.8 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere;margin:7px 0 0;color:#bfead8;}
.flow-node-chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px;}
.flow-node-chips button{font-size:10px;min-height:30px;border-radius:20px;padding:4px 10px;}
.flow-inspector{margin-top:15px;border-left:2px solid #8ae7cb;padding:12px 16px;background:#193e3a;}
.flow-inspector p{font-size:12px;line-height:1.8;margin:8px 0;color:#c4dfd9;}
.flow-inspector strong{color:#dff8ee;}
.flow-code-panel{background:#0a1821;border-left:1px solid var(--flow-line);min-width:0;}
.flow-panel-head{display:flex;align-items:center;gap:10px;padding:16px 20px;border-bottom:1px solid var(--flow-line);}
.flow-panel-head h3{font-size:12px;letter-spacing:0;margin:0;color:#d3e5ed;}
.flow-panel-head>span{font-size:10px;color:#93afbc;margin-left:auto;}
.flow-panel-head button{font-size:10px;min-height:30px;padding:5px 9px;}
.flow-code-panel>pre{margin:0;padding:20px;min-height:225px;max-height:380px;overflow:auto;font:12px/1.85 var(--mono);color:#c4e8e1;tab-size:2;white-space:pre-wrap;overflow-wrap:anywhere;}
.flow-code-note{padding:0 20px 16px;font-size:10px;line-height:1.8;color:#9bb5c2;margin:0;}
.flow-bottom-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--flow-line);}
.flow-output{min-width:0;background:#10232e;}
.flow-output>p{margin:0;padding:18px 20px;font-size:14px;color:#def0f4;min-height:78px;line-height:1.85;}
.flow-output .flow-panel-head span{color:#9cedc9;background:#23453c;padding:3px 8px;border-radius:20px;}
.flow-output [data-status=failed],.flow-output [data-status=rejected]{background:#4e302a!important;color:#ffc2ac!important;}
.flow-output [data-status=cancelled]{background:#4e4028!important;color:#ffe0a6!important;}
.flow-counters{margin:0;padding:0 20px 10px;display:flex;gap:30px;}
.flow-counters dt{font-size:10px;color:#9ab8c5;}
.flow-counters dd{font:23px var(--mono);color:#a3ead7;margin:4px 0;}
.flow-output>small{display:block;padding:0 20px 18px;color:#9bb5c2;font-size:10px;}
.flow-event-panel{border-left:1px solid var(--flow-line);min-width:0;}
.flow-event-panel ol{margin:0;list-style:none;padding:12px 20px;max-height:210px;overflow:auto;}
.flow-event-panel li{padding:8px 0;border-bottom:1px solid #263f4b;}
.flow-event-panel li>span{font:11px var(--mono);color:#a7ddf6;}
.flow-event-panel li>p{margin:4px 0 0;font-size:11px;line-height:1.6;color:#aec6d0;overflow-wrap:anywhere;}
.flow-empty-event{color:#a6bdc9;font-size:12px;}
.flow-footnote{padding:16px 24px;border-top:1px solid var(--flow-line);font-size:11px;color:#a8c1cd;line-height:1.8;background:#102833;}
.flow-experience:fullscreen,.flow-experience.flow-expanded{margin:0;border-radius:0;overflow:auto;width:100%;height:100%;}
.flow-experience.flow-expanded{position:fixed;inset:0;z-index:1000;}
.flow-experience:fullscreen .flow-scene,.flow-experience.flow-expanded .flow-scene{height:65vh;min-height:440px;}
@media(min-width:1800px){.flow-experience:fullscreen .flow-detail-grid,.flow-experience:fullscreen .flow-bottom-grid{grid-template-columns:1fr 1fr;}}
@media(max-width:800px){body.flow-page .page{padding-left:14px;padding-right:14px;}.flow-experience{border-radius:12px;}.flow-mast{padding:21px 18px;}.flow-mast h2{font-size:23px;}.flow-mast p:not(.flow-kicker){font-size:12px;}.flow-version{display:none;}.flow-scenario-row{display:block;padding:14px 18px;}.flow-scenario-row label{min-width:0;}.flow-scenario-row p{margin-top:10px;font-size:11px;}.flow-scene{height:440px;}.flow-scene-top{inset:12px 14px auto;font-size:9px;}.flow-scene-tools{top:45px;left:12px;gap:5px;}.flow-scene-tools button{font-size:10px;min-height:34px;padding:6px 9px;}.flow-scene-legend{left:14px;bottom:40px;gap:9px;font-size:9px;}.flow-scene-help{left:14px;font-size:9px;}.flow-detail-grid,.flow-bottom-grid{grid-template-columns:1fr;}.flow-code-panel,.flow-event-panel{border-left:0;border-top:1px solid var(--flow-line);}.flow-player{padding:14px 14px 6px;gap:8px;flex-wrap:wrap;}.flow-player>label{margin-left:auto;}.flow-player .flow-play{min-width:87px;}.flow-player button{padding:8px 11px;}.flow-timeline{padding:0 14px 14px;}.flow-explanation{padding:20px;}.flow-counters{gap:24px;}.flow-code-panel>pre{min-height:160px;}}
@media print{.flow-viewport-wrap,.flow-player,.flow-timeline,.flow-node-chips{display:none!important;}.flow-experience{background:#fff;color:#111;box-shadow:none;}.flow-experience *{background:transparent!important;color:#111!important;}}

.flow-scene-caption{position:absolute;right:22px;bottom:20px;max-width:45%;padding:13px 16px;background:#0b2331e8;border:1px solid #385567;border-left:2px solid #7ae7c8;border-radius:9px;pointer-events:none;backdrop-filter:blur(10px);}
.flow-scene-caption>span{font:10px var(--mono);color:#9be9d1;display:block;margin-bottom:4px;}
.flow-scene-caption strong{font-size:14px;color:#eff9fc;font-weight:600;}
.flow-scene-caption p{font-size:10px;line-height:1.8;color:#b5cbd7;max-height:54px;overflow:hidden;margin:4px 0 0;}
@media(max-width:800px){.flow-scene-caption{right:12px;left:12px;max-width:none;bottom:72px;padding:9px 12px;}.flow-scene-caption strong{font-size:12px;}.flow-scene-caption p{display:none;}}