@import "https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap";:root{--bg:#101a1d;--panel:#142125;--line:#2a383b;--text:#e9ede6;--muted:#9aabaa;--green:#d6ef9a;--accent-cyan:#d6ef9a;color:var(--text);background:var(--bg);font-synthesis:none;color-scheme:dark;font-family:DM Sans,sans-serif}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--green);outline-offset:5px}button,a{color:inherit}button{transition:background .18s,color .18s,border-color .18s}button:hover{color:var(--green)}#ui-overlay{flex-direction:column;max-width:1920px;min-height:100svh;margin:auto;padding:0 36px;display:flex}.header-bar{border-bottom:1px solid var(--line);align-items:center;gap:38px;height:96px;display:flex}.brand{letter-spacing:-1.4px;align-items:center;gap:12px;font-family:Manrope,sans-serif;font-size:31px;font-weight:800;text-decoration:none;display:flex}.brand svg{fill:none;width:38px;stroke:var(--green);stroke-width:1.1px}.brand svg circle{fill:var(--green);stroke:none}.brand-dot{color:var(--green)}.header-description,.section-label,.eyebrow,.scene-topline{letter-spacing:1.8px;font-size:10px;font-weight:600}.header-description{color:var(--muted);border-left:1px solid var(--line);padding-left:30px}.header-actions{color:var(--muted);align-items:center;gap:10px;margin-left:auto;font-size:11px;display:flex}.live-dot{background:var(--green);border-radius:50%;width:5px;height:5px;display:inline-block;box-shadow:0 0 10px #d6ef9a33}.header-actions .quiet-btn{border:1px solid var(--line);border-radius:5px;margin-left:18px;padding:9px 12px}.chapter-nav{border-bottom:1px solid var(--line);grid-template-columns:repeat(4,1fr);display:grid}.chapter-btn{text-align:left;color:var(--muted);background:0 0;border:0;align-items:center;gap:15px;padding:23px 18px;font-size:13px;display:flex;position:relative}.chapter-btn:first-child{padding-left:0}.chapter-btn.active{color:var(--text)}.chapter-btn:after{content:"";background:0 0;height:2px;position:absolute;bottom:-1px;left:0;right:0}.chapter-btn.active:after{background:var(--green)}.chapter-number{font-variant-numeric:tabular-nums;color:#718683;font-size:10px}.chapter-btn.active .chapter-number{color:var(--green)}.nav-arrow{opacity:0;margin-left:auto}.chapter-btn.active .nav-arrow{opacity:1;color:var(--green)}.main-content{flex:1;grid-template-columns:280px minmax(280px,1fr) 238px;gap:28px;min-height:630px;padding:34px 0 26px;display:grid}.info-panel{flex-direction:column;align-items:flex-start;padding:12px 0;display:flex}.eyebrow{color:var(--green);letter-spacing:1.6px;align-items:center;gap:9px;font-size:9px;display:flex}.short-rule{background:var(--green);width:19px;height:1px}h1{letter-spacing:-1.5px;margin:23px 0 21px;font-family:Manrope,sans-serif;font-size:36px;font-weight:500;line-height:1.17}p{color:var(--muted);margin:0;font-size:12px;line-height:1.8}.intro{font-size:13px;line-height:1.85}.concept{border-top:1px solid var(--line);margin-top:31px;padding-top:25px}.section-label{color:#93a6a2;letter-spacing:1.6px;font-size:9px}h2{margin:13px 0 10px;font-size:15px;font-weight:500}.principle{gap:10px;margin-top:22px;display:flex}.principle>span{color:var(--green);font-size:21px}.principle p{color:#c4cfc3;font-size:11px}.source-link{color:#9dac9f;align-items:center;gap:15px;margin-top:auto;padding-top:25px;font-size:10px;text-decoration:none;display:flex}.source-link:hover,.source-link span{color:var(--green)}.visual-panel{background:#142326;border:1px solid #2a3d3e;border-radius:12px;flex-direction:column;min-width:0;display:flex;position:relative;overflow:hidden}.scene-topline{color:#829a96;letter-spacing:1px;justify-content:space-between;gap:8px;padding:21px 20px;font-size:8px;display:flex}.scene-topline .live-dot{width:4px;height:4px;margin-right:6px}.scene-viewport{flex:1;min-height:340px;position:relative;overflow:hidden}#canvas-container{width:100%;height:100%;position:absolute;inset:0}#canvas-container canvas{touch-action:none;width:100%;height:100%;display:block}#scene-labels{pointer-events:none;position:absolute;inset:0;overflow:hidden}.scene-label{white-space:nowrap;color:#c7d9cc;background:#142326c9;border:1px solid #38524d;border-radius:3px;padding:6px 9px;font-size:10px;position:absolute;transform:translate(-50%,-50%)}.scene-caption{color:#a9bbb1;text-align:center;justify-content:center;align-items:center;gap:9px;height:48px;padding:0 20px;font-size:11px;display:flex}.caption-line{background:var(--green);flex-shrink:0;width:16px;height:1px}.scene-toolbar{color:#91a59e;border-top:1px solid #2a3d3e;justify-content:space-between;align-items:center;gap:12px;margin:0 20px;padding:15px 0;font-size:9px;display:flex}.separator{color:#55726d;margin:0 7px}.view-presets{gap:3px;display:flex}.view-btn{color:#8ca099;background:0 0;border:0;border-radius:4px;padding:7px;font-size:9px}.view-btn.active{color:var(--green);background:#2e413b}.metrics-strip{background:#182a2b;border-top:1px solid #2a3d3e;grid-template-columns:repeat(3,1fr);padding:23px 12px;display:grid}.metrics-strip>div{text-align:center;border-right:1px solid #34473f;flex-direction:column;gap:6px;display:flex}.metrics-strip>div:last-child{border:0}.metrics-strip strong{color:#e3edda;letter-spacing:-.8px;font-family:Manrope,sans-serif;font-size:27px;font-weight:500}.metrics-strip span{color:#9fae9e;font-size:9px}.control-panel{flex-direction:column;gap:15px;padding:12px 0;display:flex}.control-title{justify-content:space-between;align-items:center;margin-bottom:6px;display:flex}.control-title>span:last-child{color:#617d70;font-size:11px}.action-btn{background:var(--green);color:#233327;border:0;border-radius:6px;justify-content:space-between;align-items:center;padding:15px 13px;font-size:12px;font-weight:600;display:flex}.action-btn:hover{color:#142326;background:#e4f6bf}.action-btn kbd{border:1px solid #64744855;border-radius:3px;padding:3px 4px;font-size:8px;font-weight:400}.quiet-btn{color:var(--muted);background:0 0;border:0;padding:5px;font-size:11px}.playback-row{color:#b7c4b5;justify-content:space-between;align-items:center;margin-top:-5px;font-size:10px;display:flex}.playback-row .quiet-btn{padding:0}.stage-list{flex-direction:column;gap:0;margin:7px 0 0;display:flex}.stage-step{text-align:left;color:#859c92;background:0 0;border:0;align-items:center;gap:11px;padding:10px 0;font-size:11px;display:flex;position:relative}.stage-dot{border:1px solid #668073;border-radius:50%;width:6px;height:6px;margin:0 2px;position:relative}.stage-step:not(:last-child) .stage-dot:after{content:"";background:#30473e;width:1px;height:21px;position:absolute;top:8px;left:1px}.stage-step.active{color:var(--green)}.stage-step.active .stage-dot{background:var(--green);border-color:var(--green);box-shadow:0 0 0 4px #d6ef9a10}.stage-order{opacity:.6;margin-left:auto;font-size:9px}input[type=range]{appearance:none;background:linear-gradient(to right, var(--green) var(--progress,0%), #31463c var(--progress,0%));cursor:pointer;width:100%;height:3px;margin:7px 0}input[type=range]::-webkit-slider-thumb{appearance:none;background:var(--green);border:2px solid #e8f6d0;border-radius:50%;width:11px;height:11px}input[type=range]::-moz-range-thumb{background:var(--green);border:0;border-radius:50%;width:9px;height:9px}.legend{border-top:1px solid var(--line);margin-top:7px;padding-top:21px}.legend-item{color:#ccd5cb;align-items:center;gap:10px;margin-top:16px;font-size:11px;display:flex}.legend-dot{background:var(--dot);border-radius:50%;flex-shrink:0;width:9px;height:9px;box-shadow:inset -2px -2px 3px #0003}.legend-item small{color:#899f93;margin-top:4px;font-size:9px;display:block}.model-note{margin-top:9px}.model-note p{margin-top:9px;font-size:10px;line-height:1.7}.equation-card{background:#1b2929;border:1px solid #34413b;border-radius:7px;margin-top:auto;padding:15px}.equation{color:#d6e5c7;margin:10px 0;font-family:Manrope,sans-serif;font-size:15px;line-height:1.7}.equation-card small{color:#98aa97;font-size:9px;line-height:1.7;display:block}.control-label{color:var(--muted);font-size:10px}.segmented{border:1px solid var(--line);border-radius:6px;padding:3px;display:flex}.segmented button{color:var(--muted);background:0 0;border:0;border-radius:4px;flex:1;padding:10px 3px;font-size:10px}.segmented button.active{color:var(--green);background:#334333}select{width:100%;color:var(--text);background:#1d2d29;border:1px solid #3a4c3d;border-radius:4px;padding:9px;font-size:10px}.bottom-bar{border-top:1px solid var(--line);flex-shrink:0;justify-content:space-between;align-items:center;height:68px;display:flex}.footer-note{color:#81958a;font-size:10px}.tour-controls{color:#b6c5b2;font-variant-numeric:tabular-nums;align-items:center;gap:22px;font-size:10px;display:flex}.tour-controls button{font-size:18px}.bottom-bar #btn-tour{color:#cfdfbc;border:1px solid #40503c;border-radius:5px;padding:9px 13px}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}@media (width>=1500px){#ui-overlay{padding:0 54px}.main-content{grid-template-columns:320px minmax(400px,1fr) 260px;gap:40px}h1{font-size:43px}.intro{font-size:14px}.concept p{font-size:13px}.scene-viewport{min-height:400px}}@media (width<=1190px){#ui-overlay{padding:0 22px}.main-content{grid-template-columns:230px minmax(230px,1fr) 205px;gap:18px}h1{font-size:30px}.header-description{font-size:8px}.scene-toolbar{flex-direction:column;gap:5px}.scene-topline{padding:17px 13px}#model-id{display:none}.equation{font-size:13px}.main-content{padding-top:24px}}@media (width<=950px){#ui-overlay{padding:0 20px}.header-description{display:none}.main-content{grid-template-columns:240px minmax(0,1fr);gap:24px}.visual-panel{grid-area:1/2/3}.control-panel{grid-column:1}.info-panel{padding-bottom:0}.control-panel{border-top:1px solid var(--line);padding-top:24px}.source-link{margin-top:0}.scene-viewport{min-height:450px}.header-bar{height:80px}.chapter-btn{gap:8px;padding:20px 10px;font-size:11px}.chapter-number{font-size:9px}.nav-arrow{display:none}.metrics-strip strong{font-size:24px}.scene-caption{height:60px;font-size:10px}.control-title{margin:0}.model-note{display:none}}@media (width<=650px){#ui-overlay{padding:0 18px}.header-bar{height:75px}.brand{font-size:27px}.brand svg{width:30px}.header-actions>span{display:none}.header-actions .quiet-btn{margin:0}.chapter-nav{grid-template-columns:repeat(4,minmax(0,1fr))}.chapter-btn{flex-direction:column;align-items:flex-start;gap:6px;padding:15px 4px;font-size:10px;line-height:1.4}.chapter-btn:first-child{padding-left:4px}.chapter-number{font-size:9px}.main-content{flex-direction:column;gap:22px;padding-top:26px;display:flex}.info-panel{padding:0}h1{margin:17px 0;font-size:36px}.intro{font-size:13px}.concept{margin-top:23px;padding-top:20px}.principle{margin-top:15px}.source-link{padding-top:16px}.visual-panel{order:1;min-height:490px}.control-panel{border:0;order:2;grid-template-columns:1fr 1fr;column-gap:20px;padding:0 0 4px;display:grid}.control-title,.action-btn,.playback-row,#sequence-progress,.stage-list,.control-panel>.control-label,.segmented,.control-panel>select,.control-panel>#btn-reset{grid-column:1/-1}.legend{grid-column:1;margin:0;padding-top:18px}.equation-card{grid-column:2;align-self:center}.stage-list{grid-template-columns:repeat(4,1fr);gap:7px;display:grid}.stage-step{flex-direction:column;align-items:flex-start;gap:12px;font-size:9px}.stage-step:not(:last-child) .stage-dot:after{width:42px;height:1px;top:2px;left:14px}.stage-order{display:none}.scene-viewport{min-height:300px}.scene-topline{padding:17px}.scene-toolbar{flex-direction:row;margin:0 15px;font-size:8px}.view-btn{padding:6px;font-size:8px}.metrics-strip{padding:17px 5px}.metrics-strip strong{font-size:25px}.bottom-bar{height:70px}.footer-note{display:none}.tour-controls{gap:19px}.bottom-bar #btn-tour{font-size:10px}.equation{font-size:14px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}.control-panel{gap:12px}.legend{padding-top:17px}.legend-item{margin-top:12px}.stage-step{padding:8px 0}.stage-step:not(:last-child) .stage-dot:after{height:17px}.model-note{margin:2px 0}.model-note summary{cursor:pointer}.model-note summary:hover{color:var(--green)}@media (width>=951px){.main-content{min-height:650px}.scene-viewport{min-height:300px}}@media (width>=651px) and (width<=950px){.visual-panel{align-self:start;position:sticky;top:20px}.scene-viewport{min-height:360px}.metrics-strip{padding:18px 8px}.scene-topline{font-size:7px}}@media (width<=650px){.stage-step:not(:last-child) .stage-dot:after{height:1px}.model-note{grid-column:1/-1;display:block}}.segmented button:disabled{opacity:.35;cursor:default}@media (width<=650px){.control-panel>.legend,.control-panel>.equation-card{order:1}.control-panel>.model-note{order:2}}