._lesson_mcfg9_1{--plot:#fff;--soft:#f4f7f7;--ink:#24383e;--muted:#60757b;--grid:#dde7e8;--accent:#247f84;--gold:#a67625;--negative:#b85359;--positive:#248979;--phaseMinus:#bc702b;color:var(--ink);padding-bottom:76px}._lesson_mcfg9_1 *{box-sizing:border-box}.dark ._lesson_mcfg9_1{--plot:#0d0f10;--soft:#15181a;--ink:#e4e7e8;--muted:#9ba1a5;--grid:#24282b;--accent:#7ad4d4;--gold:#ebc278;--negative:#f49390;--positive:#7de0c5;--phaseMinus:#ecaf72}._heading_mcfg9_33{padding:4px 0 27px}._eyebrow_mcfg9_36{font:11px var(--font-mono);color:var(--gold);letter-spacing:.12em;text-transform:uppercase;margin-bottom:12px}._heading_mcfg9_33 h1{letter-spacing:-.035em;font-size:clamp(27px,3vw,38px);font-weight:500;line-height:1.35}._heading_mcfg9_33 p,._intro_mcfg9_50{max-width:92ch;color:var(--muted);margin-top:12px;font-size:16px;line-height:1.85}._chapterNav_mcfg9_57{border-bottom:1px solid var(--border);color:var(--muted);flex-wrap:wrap;gap:28px;padding-bottom:18px;font-size:14px;display:flex}._chapterNav_mcfg9_57 a:hover{color:var(--accent)}._section_mcfg9_69{padding-top:35px;scroll-margin-top:95px}._section_mcfg9_69+._section_mcfg9_69{border-top:1px solid var(--border);margin-top:26px}._section_mcfg9_69 h2{letter-spacing:-.02em;margin-bottom:10px;font-size:23px;font-weight:500;line-height:1.5}._section_mcfg9_69 h2>span{color:var(--gold);margin-right:15px;font:22px Georgia,serif}._section_mcfg9_69>p{color:var(--muted);max-width:95ch;margin-bottom:24px;font-size:16px;line-height:1.85}._bench_mcfg9_98{border:1px solid var(--border);background:var(--plot);border-radius:9px;overflow:hidden}._benchMain_mcfg9_104{grid-template-columns:minmax(0,1fr) 310px;display:grid}._side_mcfg9_108{border-left:1px solid var(--border);background:var(--plot);flex-direction:column;gap:21px;padding:25px;display:flex}._side_mcfg9_108 h3{font-size:16px;font-weight:500}._control_mcfg9_120{gap:12px;display:grid}._control_mcfg9_120>div{color:var(--muted);justify-content:space-between;gap:12px;font-size:13px;display:flex}._control_mcfg9_120 output{color:var(--ink);font-variant-numeric:tabular-nums}._control_mcfg9_120 input[type=range]{width:100%;accent-color:var(--accent);cursor:pointer}._choices_mcfg9_140{flex-wrap:wrap;gap:7px;display:flex}._choices_mcfg9_140 button,._textButton_mcfg9_146{border:1px solid var(--border);cursor:pointer;background:var(--plot);color:var(--muted);border-radius:5px;padding:8px 13px;font-size:13px;transition:background .18s,color .18s}._choices_mcfg9_140 button[aria-pressed=true]{color:var(--accent);border-color:var(--accent);background:color-mix(in srgb, var(--accent) 8%, var(--plot))}._choices_mcfg9_140 button:hover,._textButton_mcfg9_146:hover{color:var(--ink);border-color:var(--muted)}._transport_mcfg9_168{flex-wrap:wrap;align-items:center;gap:10px;display:flex}._transport_mcfg9_168 button{border:1px solid var(--border);cursor:pointer;border-radius:5px;align-items:center;gap:8px;padding:9px 14px;font-size:13px;display:flex}._transport_mcfg9_168 button:first-child{background:var(--ink);color:var(--plot);border-color:var(--ink)}._transport_mcfg9_168 button:disabled{opacity:.45;cursor:default}._transport_mcfg9_168 svg{width:15px;height:15px}._explain_mcfg9_197{background:var(--soft);border-top:1px solid var(--border);padding:22px 26px;font-size:15px;line-height:1.9}._explain_mcfg9_197 b{color:var(--ink);font-weight:500}._side_mcfg9_108 p{color:var(--muted);font-size:14px;line-height:1.85}._legend_mcfg9_213{color:var(--muted);border-top:1px solid var(--border);flex-wrap:wrap;gap:13px 22px;padding:16px 22px;font-size:12px;display:flex}._legend_mcfg9_213 span{align-items:center;gap:8px;display:flex}._legend_mcfg9_213 i{background:var(--accent);border-radius:50%;width:9px;height:9px;display:inline-block}._legend_mcfg9_213 ._minus_mcfg9_234{background:var(--phaseMinus)}._legend_mcfg9_213 ._bond_mcfg9_237{background:var(--positive)}._legend_mcfg9_213 ._antibond_mcfg9_240{background:var(--negative)}._orbitalFrame_mcfg9_243{background:var(--soft);min-width:0;height:420px;position:relative}._orbitalFrame_mcfg9_243[data-compact]{height:355px}._orbitalCanvas_mcfg9_252{position:absolute;inset:0}._orbitalCanvas_mcfg9_252 canvas{touch-action:pan-y;outline-offset:-4px;width:100%;height:100%;display:block}._orbitHint_mcfg9_263{color:var(--muted);pointer-events:none;font-size:11px;position:absolute;bottom:17px;left:20px}._renderFallback_mcfg9_271{font-size:15px;line-height:1.8;position:absolute;inset:35% 10%}._viewTitle_mcfg9_277{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:10px;padding:16px 22px;font-size:14px;display:flex}._viewTitle_mcfg9_277 small{color:var(--muted);font-size:11px}._two_mcfg9_290{grid-template-columns:1fr 1fr;gap:20px;display:grid}._two_mcfg9_290>._bench_mcfg9_98{min-width:0}._bondPanel_mcfg9_298 ._viewTitle_mcfg9_277{border-top:3px solid var(--positive)}._antiPanel_mcfg9_301 ._viewTitle_mcfg9_277{border-top:3px solid var(--negative)}._formula_mcfg9_304{text-align:center;padding:13px 20px;font-size:16px;overflow-x:auto}._formula_mcfg9_304 .math-block{margin:0}._formulaNote_mcfg9_313{color:var(--muted);margin:0 22px 18px;font-size:12px;line-height:1.8}._wideControls_mcfg9_319{grid-template-columns:1fr 1fr;align-items:center;gap:25px;padding:23px 0;display:grid}._readout_mcfg9_326{font-size:27px;font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.045em}._readout_mcfg9_326 small{font-size:12px;font-family:var(--font-sans);color:var(--muted);letter-spacing:0;margin-bottom:6px;display:block}._facts_mcfg9_340{grid-template-columns:repeat(3,1fr);gap:24px;padding:24px 0;display:grid}._facts_mcfg9_340 h3{margin-bottom:10px;font-size:17px;font-weight:500}._facts_mcfg9_340 p,._note_mcfg9_352{color:var(--muted);font-size:14px;line-height:1.9}._note_mcfg9_352{border-left:2px solid var(--gold);margin:20px 0;padding-left:18px}._sources_mcfg9_362{color:var(--muted);flex-wrap:wrap;gap:22px;margin-top:28px;font-size:12px;display:flex}._sources_mcfg9_362 a{border-bottom:1px solid var(--border)}._sourceInputs_mcfg9_373{background:var(--soft);justify-content:center;align-items:center;gap:18px;padding:18px;display:flex}._inputOrbital_mcfg9_381{flex-direction:column;align-items:center;gap:5px;width:105px;font-size:13px;display:flex}._inputOrbital_mcfg9_381 svg{width:88px;height:76px}._inputOrbital_mcfg9_381 text{fill:var(--plot);font:16px var(--font-sans);font-weight:600}._inputOrbital_mcfg9_381 ellipse{fill:var(--accent)}._inputOrbital_mcfg9_381 ._negativeLobe_mcfg9_401{fill:var(--phaseMinus)}._symbol_mcfg9_404{color:var(--muted);font:26px Georgia,serif}._plot_mcfg9_410{width:100%;height:auto;display:block;overflow:visible}._plot_mcfg9_410 text{font:13px var(--font-sans);fill:var(--muted)}._grid_mcfg9_420{stroke:var(--grid);stroke-width:1px}._axis_mcfg9_424{stroke:var(--muted);stroke-width:1px;opacity:.7}._curve_mcfg9_429{fill:none;stroke:var(--accent);stroke-width:2.8px;stroke-linecap:round;vector-effect:non-scaling-stroke}._area_mcfg9_436{fill:var(--accent);opacity:.065}._rectangle_mcfg9_440{fill:var(--gold);fill-opacity:.2;stroke:var(--gold);stroke-width:1px;transition:fill-opacity .2s;animation:.35s ease-out _revealPartition_mcfg9_1}._rectangle_mcfg9_440[data-negative=true]{fill:var(--negative);stroke:var(--negative)}._rectangle_mcfg9_440[data-selected=true]{fill-opacity:.48;stroke-width:2px}._sample_mcfg9_456{fill:var(--plot);stroke:var(--gold);stroke-width:2px}._dimension_mcfg9_461{stroke:var(--ink);fill:none;stroke-width:1px}._plot_mcfg9_410 ._dimensionText_mcfg9_466{fill:var(--ink);paint-order:stroke;stroke:var(--plot);stroke-width:5px;stroke-linejoin:round;font-size:14px}._statRow_mcfg9_474{border-top:1px solid var(--border);grid-template-columns:repeat(3,1fr);gap:14px;padding:20px 24px;display:grid}._comparison_mcfg9_481{grid-template-columns:repeat(3,1fr);gap:18px;display:grid}._comparison_mcfg9_481 ._bench_mcfg9_98{padding-top:16px}._comparison_mcfg9_481 h3{padding:0 20px;font-size:16px;font-weight:500}._comparison_mcfg9_481 ._readout_mcfg9_326{padding:0 20px 18px;font-size:23px}._comparison_mcfg9_481 ._plot_mcfg9_410{padding:10px 12px}._steps_mcfg9_501{grid-template-columns:repeat(3,1fr);gap:26px;padding:26px 0;display:grid}._steps_mcfg9_501 h3{margin-bottom:8px;font-size:16px;font-weight:500}._steps_mcfg9_501 p{color:var(--muted);font-size:14px;line-height:1.8}._steps_mcfg9_501 ._formula_mcfg9_304{text-align:left;padding:16px 0}._finalEquation_mcfg9_521{background:var(--soft);border-block:1px solid var(--border);text-align:center;margin:22px 0;padding:25px 14px;font-size:clamp(15px,2vw,23px);overflow-x:auto}._check_mcfg9_530{margin-top:24px}._check_mcfg9_530 summary{cursor:pointer;color:var(--accent);padding:10px 0;font-size:15px}._check_mcfg9_530 p{color:var(--muted);max-width:90ch;font-size:15px;line-height:1.9}._levelDiagram_mcfg9_545{width:100%;max-height:240px}._levelDiagram_mcfg9_545 text{fill:var(--muted);font:14px var(--font-sans)}._levelDiagram_mcfg9_545 line{stroke:var(--muted);stroke-width:1.4px}._levelDiagram_mcfg9_545 ._bondLine_mcfg9_557{stroke:var(--positive);stroke-width:3px}._levelDiagram_mcfg9_545 ._antiLine_mcfg9_561{stroke:var(--negative);stroke-width:3px}._electron_mcfg9_565{fill:var(--accent)}._wavePlot_mcfg9_568{padding:15px 20px}._wavePlot_mcfg9_568 ._plot_mcfg9_410{max-height:270px}._wavePlus_mcfg9_574{stroke:var(--positive);fill:none;stroke-width:2.5px}._waveMinus_mcfg9_579{stroke:var(--negative);fill:none;stroke-width:2.5px}._waveGhost_mcfg9_584{stroke:var(--muted);stroke-dasharray:5 5;fill:none;stroke-width:1.5px}._sliceTitle_mcfg9_590{color:var(--muted);padding:18px 22px 0;font-size:13px}._checkLabel_mcfg9_595{color:var(--muted);cursor:pointer;align-items:center;gap:8px;font-size:13px;display:flex}._checkLabel_mcfg9_595 input{accent-color:var(--accent)}@media (max-width:1000px){._benchMain_mcfg9_104{grid-template-columns:minmax(0,1fr) 260px}._side_mcfg9_108{padding:20px}._facts_mcfg9_340{gap:20px}._orbitalFrame_mcfg9_243[data-compact]{height:315px}}@media (max-width:760px){._lesson_mcfg9_1{padding-inline:20px}._benchMain_mcfg9_104,._two_mcfg9_290,._facts_mcfg9_340,._steps_mcfg9_501{grid-template-columns:1fr}._side_mcfg9_108{border-left:0;border-top:1px solid var(--border);gap:22px;padding:22px}._orbitalFrame_mcfg9_243{height:330px}._orbitalFrame_mcfg9_243[data-compact]{height:300px}._section_mcfg9_69 h2{font-size:21px}._chapterNav_mcfg9_57{gap:14px;font-size:12px}._section_mcfg9_69>p,._heading_mcfg9_33 p{font-size:15px}._wideControls_mcfg9_319{grid-template-columns:1fr;gap:24px}._comparison_mcfg9_481{grid-template-columns:1fr}._comparison_mcfg9_481 ._plot_mcfg9_410{max-height:245px}._comparison_mcfg9_481 ._readout_mcfg9_326{font-size:25px}._statRow_mcfg9_474{gap:10px;padding:18px 16px}._readout_mcfg9_326{font-size:21px}._readout_mcfg9_326 small{font-size:11px}._explain_mcfg9_197{padding:19px}._steps_mcfg9_501{gap:13px}._plot_mcfg9_410 text{font-size:26px}._plot_mcfg9_410 ._dimensionText_mcfg9_466{font-size:28px}._comparison_mcfg9_481 ._plot_mcfg9_410 text{font-size:16px}._viewTitle_mcfg9_277{padding:15px 18px}._viewTitle_mcfg9_277 small{font-size:10px}._sourceInputs_mcfg9_373{gap:12px}._inputOrbital_mcfg9_381{width:88px}._formula_mcfg9_304{font-size:14px}._wavePlot_mcfg9_568 ._plot_mcfg9_410 text{font-size:19px}._finalEquation_mcfg9_521{font-size:15px}._facts_mcfg9_340{padding-top:15px}._levelDiagram_mcfg9_545 text{font-size:16px}}@media (prefers-reduced-motion:reduce){._lesson_mcfg9_1 *{scroll-behavior:auto;transition:none!important}}@keyframes _revealPartition_mcfg9_1{0%{opacity:.35}to{opacity:1}}@media (prefers-reduced-motion:reduce){._rectangle_mcfg9_440{animation:none}}._nucleusLabels_mcfg9_740{pointer-events:none;position:absolute;inset:0}._nucleusLabels_mcfg9_740 span{font:11px var(--font-mono);color:var(--ink);background:color-mix(in srgb, var(--plot) 70%, transparent);border-radius:3px;padding:2px 4px;position:absolute;transform:translate(-50%,10px)}