@charset "UTF-8";
:root{--bg:#eef3f7;--paper:#fff;--ink:#173447;--muted:#657d8b;--line:#d7e1e8;--teal:#087e8b;--teal-light:#e3f3f2;--amber:#ecab46;--coral:#d75f4f;--blue:#3689b2;--radius:18px;font-family:'Segoe UI','Microsoft YaHei',sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}
*{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:3px solid var(--amber);outline-offset:3px}a{color:var(--teal);text-underline-offset:4px}button{border:1px solid var(--line);background:white;color:var(--ink);border-radius:9px;padding:9px 13px;transition:background .15s,transform .15s}button:hover{background:#edf7f7}button:disabled{cursor:default;opacity:.45}button.active,button[aria-pressed=true]{background:var(--teal);color:#fff;border-color:var(--teal)}.primary{background:var(--teal);border-color:var(--teal);color:#fff;font-weight:650}.primary:hover{background:#096775}.secondary{background:transparent}.text-button{border:0;background:transparent;color:var(--teal)}
.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 3.3vw;border-bottom:1px solid var(--line);background:#f8fafc}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-size:17px;font-weight:700;letter-spacing:1px}.brand-mark{width:35px;height:35px;border:1.7px solid var(--teal);border-radius:50%;position:relative;transform:rotate(-27deg)}.brand-mark:after{content:'';position:absolute;inset:6px -8px;border:1.4px solid var(--teal);border-radius:50%}.brand-mark:before{content:'';position:absolute;width:6px;height:6px;border-radius:50%;background:var(--amber);left:14px;top:14px}.top-note{font-size:11px;letter-spacing:2px;color:var(--muted)}.nav{display:flex;gap:5px;align-items:center;overflow:auto;padding:14px 3.3vw 0;background:var(--bg)}.nav a{flex-shrink:0;text-decoration:none;color:var(--muted);padding:10px 16px;border-radius:10px;font-size:13px;display:flex;align-items:center;gap:9px}.nav a span{font:11px Consolas,monospace;opacity:.6}.nav a.current{background:var(--ink);color:white}.nav a:hover:not(.current){background:white}
main{max-width:1800px;margin:0 auto;padding:24px 3.3vw 36px}.page-intro{display:flex;justify-content:space-between;align-items:end;margin-bottom:22px;gap:24px}.eyebrow{font:11px Consolas,monospace;letter-spacing:2px;color:var(--teal);text-transform:uppercase;margin-bottom:8px}h1{margin:0;font-family:'Segoe UI','Microsoft YaHei',sans-serif;font-size:clamp(26px,2.8vw,40px);font-weight:650;letter-spacing:-1px;line-height:1.3}.intro-copy{font-size:13px;color:var(--muted);line-height:1.8;max-width:420px;margin:0}.intro-copy strong{color:var(--ink);font-weight:500}.lab-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:16px}.stage-wrap{position:relative;min-width:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#e8eff4;min-height:560px}.stage{position:absolute;inset:0}.stage canvas{width:100%;height:100%;display:block;touch-action:none}.stage-top{position:absolute;top:18px;left:20px;right:20px;display:flex;justify-content:space-between;align-items:start;gap:12px;pointer-events:none;z-index:2}.stage-top>*{pointer-events:auto}.scene-label{display:flex;flex-direction:column;gap:7px;font-size:12px;color:var(--muted)}.scene-label strong{font-size:14px;color:var(--ink);font-weight:600}.pill{display:inline-flex;align-items:center;gap:7px;border:1px solid #c6d9df;background:#ffffffd9;border-radius:30px;padding:6px 10px;font-size:11px}.pill:before{content:'';width:5px;height:5px;border-radius:50%;background:var(--teal)}.view-switch{display:flex;gap:3px;background:#ffffffdf;padding:3px;border-radius:9px;border:1px solid #d8e2e8}.view-switch button{border:0;background:transparent;padding:6px 9px;font-size:11px}.view-switch button.active{background:var(--ink);color:#fff}.stage-bottom{position:absolute;bottom:17px;left:20px;right:20px;display:flex;justify-content:space-between;align-items:end;gap:12px;pointer-events:none;z-index:2}.stage-bottom>*{pointer-events:auto}.hint-chip{font-size:11px;line-height:1.7;color:var(--muted);background:#f8fbfbdc;padding:8px 12px;border:1px solid #dce5e7;border-radius:10px}.legend{display:flex;gap:13px;font-size:10px;color:var(--muted);flex-wrap:wrap}.legend i{width:7px;height:7px;border-radius:50%;display:inline-block;margin-right:4px}.panel{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:20px;min-width:0}.panel h2{font-size:18px;margin:4px 0 10px;font-weight:600}.panel h3{font-size:13px;margin:18px 0 12px}.panel p{font-size:12px;line-height:1.85;color:var(--muted);margin:8px 0 13px}.panel .small{font-size:10px;line-height:1.7}.level-tabs{display:flex;gap:5px;margin-bottom:16px}.level-tabs button{flex:1;font-size:11px;padding:7px 5px}.control{margin:16px 0}.control label{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:12px;margin-bottom:8px}.control output{font:12px Consolas,monospace;color:var(--teal);white-space:nowrap}input[type=range]{width:100%;height:5px;accent-color:var(--teal);cursor:pointer;margin:8px 0 5px}.range-ends{display:flex;justify-content:space-between;font-size:10px;color:#8a9aa3}.split{display:grid;grid-template-columns:1fr 1fr;gap:8px}.split>*{min-width:0}.check{display:flex;gap:8px;align-items:center;font-size:12px;margin:12px 0}.check input{accent-color:var(--teal)}select{width:100%;background:#f4f7f9;color:var(--ink);padding:9px;border:1px solid var(--line);border-radius:7px;font-size:12px}.launch-row{display:flex;gap:8px;margin-top:18px}.launch-row .primary{flex:1}.readouts{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:13px}.readout{border:1px solid #e0e8ed;border-radius:9px;background:#f7f9fb;padding:9px 10px;min-width:0}.readout span{display:block;font-size:10px;color:var(--muted);margin-bottom:5px}.readout strong{font:17px Consolas,monospace;font-weight:500;white-space:nowrap}.readout small{font-size:10px;margin-left:3px;color:var(--muted)}.status{padding:11px 13px;border-radius:9px;background:var(--teal-light);color:#22636a;font-size:12px;line-height:1.7;margin-top:12px;min-height:42px}.status.success{background:#d9f1e8;color:#186b50}.status.miss{background:#fff3dc;color:#85602b}.rule{border:0;border-top:1px solid var(--line);margin:17px 0}.formula-strip{margin-top:16px;display:grid;grid-template-columns:240px 1fr;gap:22px;padding:22px 25px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;align-items:center}.formula{font-family:Cambria,Georgia,serif;font-size:29px;letter-spacing:1px;white-space:nowrap}.formula button{font:inherit;font-style:italic;padding:0 5px;border:0;border-bottom:2px solid var(--teal);border-radius:0;background:none}.formula button:hover{background:var(--teal-light)}.formula-note{font-size:12px;line-height:1.9;color:var(--muted)}.formula-note strong{font-weight:600;color:var(--ink)}.formula-note p{margin:0}.formula-caption{font-size:10px;color:var(--muted);margin-top:8px;letter-spacing:0}.learn-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}.learning{background:#f9fbfc;border:1px solid var(--line);border-radius:12px;padding:14px 18px;font-size:12px;line-height:1.9}.learning summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:10px}.learning summary:after{content:'＋';color:var(--teal)}.learning[open] summary:after{content:'−'}.learning p{color:var(--muted);margin-bottom:2px}.footer{display:flex;justify-content:space-between;gap:18px;font-size:10px;color:var(--muted);padding:20px 3.3vw;border-top:1px solid var(--line);line-height:1.8}.footer a{color:var(--muted)}.error{padding:24px;background:#fff3dc;font-size:14px;line-height:2}.mini-canvas{width:100%;height:220px;border-radius:10px;border:1px solid var(--line);display:block;cursor:crosshair}.color-bar{display:flex;justify-content:space-between;border-top:6px solid transparent;border-image:linear-gradient(90deg,#3483ae,#ecf0ef,#d75f4f) 1;font:10px Consolas,monospace;padding-top:4px;margin:9px 0 14px}.probe-detail{position:absolute;top:78px;left:20px;max-width:230px;background:#fffffff2;border:1px solid var(--line);padding:11px 14px;border-radius:10px;font-size:11px;line-height:1.8;z-index:3}.probe-detail strong{color:var(--teal)}.scene-error{position:absolute;inset:0;display:grid;place-content:center;padding:30px;text-align:center}.trajectory-key{position:absolute;bottom:67px;left:20px;font-size:11px;color:var(--teal)}.mini-tag{font:10px Consolas,monospace;letter-spacing:1px;color:var(--muted)}.plot-label{font-size:11px;display:flex;justify-content:space-between;color:var(--muted);margin:10px 0 7px}.one-line{white-space:nowrap}.progress-track{height:3px;background:#d4e4e7;border-radius:3px;margin:10px 0}.progress-fill{height:100%;width:0;background:var(--teal);transition:width .1s}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.dialogue-text{display:grid;grid-template-columns:1fr 1fr;gap:4px 22px;margin-top:14px}.dialogue-text p{padding:8px 10px;border-left:2px solid transparent}.dialogue-text p.speaking{background:#e3f3f2;border-left-color:var(--teal);color:var(--ink)}.scrub-row{display:flex;align-items:center;gap:9px;font-size:10px;color:var(--muted);margin:9px 0}.scrub-row input{flex:1}.mobile-wrap{white-space:normal}
.explain-layer{display:grid;grid-template-columns:1fr 1.25fr;gap:28px;padding:23px 25px;background:#fff;border:1px solid var(--line);border-radius:16px;margin-top:16px}.explain-layer h2{font-size:20px;margin:8px 0}.explain-layer p,.layer-reading{font-size:13px;line-height:1.9;margin:7px 0;color:var(--muted)}.layer-buttons{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}.layer-buttons button{font-size:12px}.layer-reading strong{color:var(--ink)}.concept-lead{padding:14px 18px;background:#e3f3f2;border-left:3px solid var(--teal);font-size:14px;line-height:1.8;margin-bottom:18px}.purpose{font-size:14px;line-height:1.8;color:var(--ink)}
@media(min-width:1550px){.stage-wrap{min-height:640px}.lab-layout{grid-template-columns:minmax(0,1fr) 340px}.panel{padding:25px}}
@media(max-width:1000px){.lab-layout{grid-template-columns:minmax(0,1fr) 280px}.panel{padding:16px}.top-note{display:none}.nav a{padding:9px 12px}.intro-copy{max-width:330px}.stage-wrap{min-height:570px}}
@media(max-width:760px){.topbar{height:60px;padding:0 20px}.brand{font-size:14px}.brand-mark{width:27px;height:27px}.brand-mark:before{left:10px;top:10px}.nav{padding:10px 12px 0}.nav a{font-size:12px;padding:9px 11px}.nav a span{display:none}main{padding:20px 14px}.page-intro{display:block;margin-bottom:16px}.intro-copy{margin-top:10px;max-width:none}.lab-layout{display:flex;flex-direction:column}.stage-wrap{min-height:430px;height:55vh;max-height:600px}.panel{padding:19px}.formula-strip{grid-template-columns:1fr;gap:12px;padding:20px}.learn-row{grid-template-columns:1fr}.stage-top{left:12px;right:12px;top:12px}.stage-bottom{left:12px;right:12px;bottom:12px}.hint-chip{max-width:180px;font-size:10px}.footer{padding:20px;flex-direction:column}.probe-detail{top:70px;left:12px}.mini-canvas{height:280px}}
@media(max-width:760px){.dialogue-text,.explain-layer{grid-template-columns:1fr}.explain-layer{gap:10px;padding:18px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;scroll-behavior:auto!important}}