:root{color-scheme:dark;--bg:#080e17;--panel:#0c1420;--line:#24303e;--muted:#8d9cac;--text:#ecf0f3;--amber:#f1b563;--cyan:#69d6df;--blue:#82aeca;--font:Arial,Helvetica,sans-serif;--mono:'SFMono-Regular',Consolas,'Liberation Mono',monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:14px;-webkit-font-smoothing:antialiased}button,input,a{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{font:inherit;cursor:pointer}button,a,input,summary{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--cyan)}button{color:inherit}a{color:inherit;text-decoration:none}button{background:none;border:0}button:disabled{cursor:default;opacity:.25}button:not(:disabled):hover{filter:brightness(1.2)}.shell{width:min(1472px,calc(100% - 96px));margin-inline:auto}.site-header{height:112px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:30px}.brand{display:flex;align-items:center;gap:15px;flex-shrink:0}.brand svg{width:37px;height:37px;fill:none;stroke:var(--amber);stroke-width:1.3;overflow:visible}.brand svg circle{fill:var(--amber);stroke:none}.brand>span{font-size:22px;font-weight:700;letter-spacing:2.8px}.brand-sub{display:block;margin-top:6px;font:8px var(--mono);letter-spacing:2px;color:var(--muted)}nav{display:flex;gap:34px;font-size:13px;color:#9ca9b7}nav a{padding:12px 0}nav a:hover,nav .nav-current{color:#f5f5f2}nav span{margin-left:5px;color:var(--amber)}.header-tag{font:10px var(--mono);letter-spacing:1.3px;display:flex;gap:9px;align-items:center;color:#a5b3be}.header-tag i{width:5px;height:5px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px #69d6df66}.hero{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;padding-block:61px 54px}.eyebrow{font:9px var(--mono);font-weight:400;letter-spacing:1.8px;color:var(--muted);display:flex;align-items:center;gap:10px;margin:0 0 21px}.short-line{width:24px;height:1px;background:var(--amber)}h1{font-size:clamp(36px,4.25vw,68px);font-weight:400;line-height:1.11;letter-spacing:-2.4px;margin:0}h1 em{font-style:normal;color:var(--amber)}.hero-aside{width:320px;padding-bottom:4px;flex-shrink:0}.hero-aside p{font-size:14px;line-height:1.8;color:#a5b0bc;margin:0 0 23px}.text-link{font-size:12px;color:#d5dce3;display:flex;justify-content:space-between;align-items:center;max-width:280px}.text-link span{color:var(--amber);font-size:20px}.section-line{border-top:1px solid var(--line);padding:20px 0;display:flex;justify-content:space-between;align-items:center;font:9px var(--mono);letter-spacing:1.8px;color:#bac3ce;gap:20px}.section-index{color:var(--amber);margin-right:12px}.model-note{font-size:10px;color:#697b8d;letter-spacing:.3px}.model-layout{border:1px solid var(--line);display:grid;grid-template-columns:232px minmax(0,1fr);background:#0c1420}.stage-sidebar{padding:25px 15px 17px;border-right:1px solid var(--line);display:flex;flex-direction:column;justify-content:space-between}.stage-sidebar-heading{display:flex;justify-content:space-between;font:8px var(--mono);color:#758696;letter-spacing:1.3px;padding-inline:11px;margin-bottom:22px}.stage-sidebar-heading>span:last-child{font-size:9px;color:#c9b08c}.stage-list{display:flex;flex-direction:column;gap:8px;flex:1}.stage-button{padding:15px 10px;display:flex;align-items:center;gap:13px;text-align:left;position:relative;border:1px solid transparent;width:100%;transition:background .2s,color .2s}.stage-button:before{content:'';position:absolute;left:-16px;top:0;bottom:0;width:2px;background:transparent}.stage-number{width:24px;font:11px var(--mono);color:#556779;flex-shrink:0}.stage-button .stage-name{display:block;font-size:12px;color:#c0c9d3;line-height:1.3}.stage-button .stage-short{display:block;font-size:10px;color:#5f7285;margin-top:5px}.stage-button .stage-arrow{margin-left:auto;font-size:15px;color:transparent}.stage-button:hover{background:#14202c}.stage-button.active{background:#f3b3610b;border-color:#f1b56322}.stage-button.active:before{background:var(--amber)}.stage-button.active .stage-number,.stage-button.active .stage-name,.stage-button.active .stage-arrow{color:var(--amber)}.stage-button.active .stage-short{color:#a79681}.stage-button.completed .stage-number{color:#ae9270}.tour-button{display:flex;align-items:center;gap:9px;font-size:10px;padding:15px 9px 1px;border-top:1px solid var(--line);margin-top:20px;width:100%;color:#c4ccd4}.play-small{font-size:17px;color:var(--amber)}.tour-duration{margin-left:auto;color:#647787;font:9px var(--mono)}.tour-button.active{color:var(--amber)}.model-area{min-width:0;display:flex;flex-direction:column}.model-topbar{padding:23px 26px 0;display:flex;justify-content:space-between;align-items:center;gap:12px}.live-label{display:flex;align-items:center;gap:8px;font:8px var(--mono);letter-spacing:1.3px;color:#8395a6;white-space:nowrap}.live-label>i{width:5px;height:5px;background:#80b9b3;border-radius:50%}.legend{display:flex;gap:17px;align-items:center;color:#8393a4;font-size:9px}.legend>span{display:flex;align-items:center;gap:7px}.legend i,.layer-button>i{width:6px;height:6px;border-radius:50%;display:inline-block;flex-shrink:0}.electron-dot{background:var(--amber)}.wave-dot{background:var(--cyan)}.magnet-dot{background:var(--blue)}.apparatus{position:relative;flex:1;min-height:340px;display:flex;align-items:center;padding:18px 13px 47px;isolation:isolate;background:radial-gradient(ellipse at 44% 50%,#13243777,transparent 62%)}#device{display:block;width:100%;height:auto;max-height:450px;overflow:visible;user-select:none}#beam-canvas{position:absolute;inset:18px 13px 47px;width:calc(100% - 26px);height:calc(100% - 65px);pointer-events:none}#device .diagram-label{font:8px var(--mono);fill:#73889b;letter-spacing:.9px}#device .diagram-small{font:9px var(--mono);fill:#658096}#device .cyan-label{fill:#6399a6}#device .blue-label{fill:#6894b4}.device-part{opacity:.42;transition:opacity .55s}.device-part.reached{opacity:.74}.device-part.focused{opacity:1;filter:drop-shadow(0 0 7px #e7b16516)}.hotspots{position:absolute;inset:18px 13px 47px}.hotspots button{position:absolute;left:var(--x);top:var(--y);transform:translate(-50%,-50%);height:23px;width:23px;border-radius:50%;background:#0b1421d9;border:1px solid #6a7c8f;font:9px var(--mono);color:#91a5b6;box-shadow:0 0 0 4px #080e1740;transition:.3s}.hotspots button.active{color:#171413;background:var(--amber);border-color:var(--amber);box-shadow:0 0 0 5px #f1b56312,0 0 18px #f1b56333}.diagram-caption{position:absolute;bottom:17px;left:28px;right:20px;display:flex;align-items:center;gap:9px;font-size:10px;color:#a9b7c4}.caption-marker{display:inline-block;width:4px;height:4px;background:var(--amber);transform:rotate(45deg);flex-shrink:0}.model-controls{padding:16px 26px;border-top:1px solid #24303e9c;display:flex;justify-content:space-between;align-items:center;gap:15px}.layer-controls{display:flex;gap:22px}.layer-button{display:flex;align-items:center;gap:8px;padding:0;font-size:10px;color:#aebdcb}.toggle-track{width:23px;height:12px;border:1px solid #5f7769;border-radius:8px;background:#395243;position:relative;margin-left:4px}.toggle-track:after{content:'';position:absolute;top:2px;left:12px;border-radius:50%;height:6px;width:6px;background:#b7d1c1;transition:left .15s}.layer-button[aria-pressed=false]{color:#53697c}.layer-button[aria-pressed=false] .toggle-track{background:#172432;border-color:#3c4b5c}.layer-button[aria-pressed=false] .toggle-track:after{left:3px;background:#617385}.playback{display:flex;align-items:center;gap:24px}.pause-button{display:flex;gap:8px;align-items:center;font-size:10px;padding:1px 0}.pause-button>span:first-child{font:13px var(--mono);color:var(--amber);width:12px}.speed-label{font:7px var(--mono);color:#5e7285;letter-spacing:1.3px}.learning-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;border-inline:1px solid var(--line);border-bottom:1px solid var(--line)}.learning-grid>section,.stage-explanation{padding:27px 27px 24px;min-width:0}.learning-grid>section{border-left:1px solid var(--line)}.explanation-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.explanation-heading .eyebrow{color:var(--amber);margin:0;font-size:8px}.step-arrows{display:flex;gap:8px}.step-arrows button{height:26px;width:26px;border:1px solid #344454;border-radius:50%;font-size:16px;line-height:1}.stage-explanation h2{font-size:23px;font-weight:400;line-height:1.2;letter-spacing:-.5px;margin:17px 0 14px;max-width:290px;min-height:55px}.stage-explanation>p{font-size:12px;color:#a5b3c1;line-height:1.8;margin:0;min-height:86px}.why-box{border-left:1px solid #6b5133;padding-left:13px;margin:22px 0 18px}.why-box>span{font:7px 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20px;max-width:285px}.slider-label{display:flex;justify-content:space-between;gap:10px;align-items:center;font-size:10px;color:#a5b6c5}.slider-label i{font-family:Georgia,serif;margin-left:2px}.slider-label output{font:17px var(--mono);color:#e4eaf0;white-space:nowrap}.slider-label output small{font-size:10px;color:#8497aa}.alpha-label{margin-top:19px}.alpha-label output{font-size:13px;color:#b8c8d5}input[type=range]{display:block;appearance:none;-webkit-appearance:none;width:100%;height:3px;margin:19px 0 11px;background:linear-gradient(to right,var(--amber) var(--range,50%),#293c4e var(--range,50%));border-radius:4px;cursor:pointer;outline-offset:10px}input[type=range]::-webkit-slider-thumb{appearance:none;width:11px;height:11px;background:var(--amber);border-radius:50%;border:2px solid #ffe4b9;box-shadow:0 0 10px #e6b46720}input[type=range]::-moz-range-thumb{width:8px;height:8px;background:var(--amber);border-radius:50%;border:2px solid #ffe4b9}#alpha-slider{--range:53.3%;background:linear-gradient(to right,#7fa7c6 var(--range),#293c4e var(--range))}#alpha-slider::-webkit-slider-thumb{background:#7fa7c6;border-color:#c2d8e8}#alpha-slider::-moz-range-thumb{background:#7fa7c6;border-color:#c2d8e8}.range-labels{display:flex;justify-content:space-between;font:7px var(--mono);color:#5f7489}.resonance-readout{border-top:1px solid var(--line);padding-top:17px;margin-top:20px;display:flex;align-items:center;justify-content:space-between;gap:12px}.resonance-readout>div>span{display:block;font:6px var(--mono);letter-spacing:.9px;color:#6d8297;margin-bottom:7px}.resonance-readout strong{font:21px var(--mono);letter-spacing:-1px;font-weight:400}.resonance-readout strong small{font-size:9px;letter-spacing:0;color:#9aadbc}.resonance-status{font-size:8px;color:var(--cyan);padding:6px 7px;border:1px solid #2c525c;background:#12303966;white-space:nowrap}.resonance-status.detuned{color:#e5b16b;border-color:#5f4b2f;background:#34281644}.tuning-feedback{font-size:10px;line-height:1.6;color:#a5b6c5;margin:11px 0 12px;min-height:32px}.sequence-note{display:flex;gap:8px;font-size:9px;line-height:1.8;color:#6c8094;margin:15px 0 0;padding-left:1px}.sequence-note>span{color:#9aabb9;font-size:11px}.physics-section{padding-top:72px}.physics-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:35px;padding-top:20px}.physics-heading h2{font-size:37px;font-weight:400;letter-spacing:-1.3px;line-height:1.2;margin:0}.physics-heading h2 span{color:#8295a6}.physics-heading>p{font-size:12px;line-height:1.8;color:#9babb9;width:320px;flex-shrink:0;margin:1px 0 0}.principles{display:grid;grid-template-columns:1fr 1fr 1fr;margin:42px 0 65px}.principles article{padding:0 39px;border-left:1px solid var(--line);position:relative}.principles article:first-child{padding-left:0;border:0}.principles article:last-child{padding-right:0}.principle-number{font:9px var(--mono);color:#54697f}.principle-symbol{font:21px Georgia,'Times New Roman',serif;color:var(--amber);margin:24px 0 23px;min-height:34px;white-space:nowrap}.principle-symbol sub{font-size:10px}.principles h3{font-size:16px;font-weight:400;margin:0 0 12px}.principles p{font-size:12px;line-height:1.9;color:#8d9eaf;margin:0;max-width:370px}.about-section{border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:110px;padding-block:45px 55px}.about-section h2{font-size:30px;line-height:1.2;font-weight:400;letter-spacing:-.8px;margin:0 0 18px}.about-section>div>p:not(.eyebrow){font-size:11px;line-height:1.9;color:#879caf;max-width:430px}.about-section .eyebrow{font-size:8px;letter-spacing:1.4px;color:#ad9474;margin-bottom:20px}details{border-block:1px solid var(--line);margin-top:23px;max-width:490px}summary{cursor:pointer;padding:15px 0;font-size:11px;color:#c4d0db;list-style:none;display:flex;justify-content:space-between}summary::-webkit-details-marker{display:none}summary span{color:var(--amber)}details[open] summary span{transform:rotate(45deg)}.details-content{padding:0 0 9px}.details-content p{font-size:10px;line-height:1.9;color:#8ca0b3}.sources>a{display:flex;justify-content:space-between;gap:20px;padding:17px 0;border-bottom:1px solid var(--line);align-items:center;font-size:13px;color:#cbd5de}.sources>a:first-of-type{padding-top:1px}.sources>a:hover{color:var(--amber)}.sources>a>span:last-child{color:#9d8666;font-size:18px}.sources small{display:block;font-size:8px;color:#637b91;margin-top:7px;line-height:1.6}.sources small:first-child{font:7px var(--mono);letter-spacing:1px;color:#b09065;margin:0 0 8px}footer{border-top:1px solid var(--line);padding-block:26px 34px;display:flex;justify-content:space-between;align-items:center;gap:20px;font-size:9px;color:#60778b}.footer-brand{font:9px 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