._lesson_1x6hc_1{--bond-blue:#388fbc;--bond-green:#4aa38a;--bond-gold:#bd853c;--bond-purple:#9475c5;--bond-ink:var(--foreground,#202827);--bond-muted:var(--muted-foreground,#737b7b);--bond-line:var(--border,#d9dede);--plot:var(--card);--soft:var(--secondary);--ink:var(--bond-ink);--muted:var(--bond-muted);--accent:var(--bond-blue);color:var(--bond-ink);padding-bottom:70px}._header_1x6hc_17{max-width:890px;padding:55px 0 30px}._eyebrow_1x6hc_21{font:11px var(--font-mono,monospace);letter-spacing:.16em;color:var(--bond-gold);margin-bottom:17px}._header_1x6hc_17 h1{font-family:var(--font-serif,Georgia, serif);letter-spacing:-.035em;margin:0 0 24px;font-size:clamp(34px,4.2vw,57px);font-weight:400;line-height:1.12}._header_1x6hc_17 p,._intro_1x6hc_36{color:var(--bond-muted);max-width:900px;font-size:16px;line-height:1.85}._nav_1x6hc_42{border-top:1px solid var(--bond-line);border-bottom:1px solid var(--bond-line);flex-wrap:wrap;gap:0 28px;margin:12px 0 45px;padding:18px 0;font-size:13px;display:flex}._nav_1x6hc_42 a{color:var(--bond-muted);padding:4px 0}._nav_1x6hc_42 a[aria-current=page]{color:var(--bond-ink);text-decoration:underline;-webkit-text-decoration-color:var(--bond-gold);text-decoration-color:var(--bond-gold);text-underline-offset:9px}._section_1x6hc_62{margin:46px 0 58px;scroll-margin-top:100px}._section_1x6hc_62 h2{font-family:var(--font-serif,Georgia, serif);letter-spacing:-.025em;align-items:baseline;gap:17px;margin:0 0 14px;font-size:clamp(24px,2.6vw,34px);font-weight:400;display:flex}._section_1x6hc_62 h2>span{font:11px var(--font-mono,monospace);color:var(--bond-gold);letter-spacing:.08em}._section_1x6hc_62>p{color:var(--bond-muted);max-width:930px;margin-bottom:24px;line-height:1.85}._bench_1x6hc_87{border:1px solid var(--bond-line);background:var(--card,#fafbfa);border-radius:14px;grid-template-columns:minmax(0,1fr) 310px;display:grid;overflow:hidden}._visual_1x6hc_95{background:radial-gradient(at 50% 35%,#6e9dad14,#0000 70%);flex-direction:column;min-width:0;display:flex}._stage_1x6hc_105{isolation:isolate;flex:1;min-height:420px;position:relative}._stage_1x6hc_105 canvas{touch-action:none;width:100%;height:100%;display:block;position:absolute;inset:0}._pairStage_1x6hc_119{cursor:grab;min-height:440px}._pairStage_1x6hc_119:active{cursor:grabbing}._stageTop_1x6hc_126{color:var(--bond-muted);flex-wrap:wrap;justify-content:space-between;gap:10px;min-height:48px;padding:19px 22px 0;font-size:12px;display:flex}._hint_1x6hc_136{color:var(--bond-muted);padding:0 22px 16px;font-size:11px}._side_1x6hc_141{border-left:1px solid var(--bond-line);flex-direction:column;gap:21px;padding:26px 24px;display:flex}._side_1x6hc_141 h3{margin:0;font-size:17px;font-weight:500}._side_1x6hc_141 p{color:var(--bond-muted);margin:0;font-size:13px;line-height:1.8}._side_1x6hc_141 label{font-size:13px}._buttons_1x6hc_162{flex-wrap:wrap;gap:8px;display:flex}._lesson_1x6hc_1 button{-webkit-appearance:none;appearance:none;cursor:pointer;font:inherit;color:inherit;border:1px solid var(--bond-line);background:0 0;border-radius:5px;padding:10px 13px;font-size:12px;transition:background .15s,border-color .15s}._lesson_1x6hc_1 button:hover{border-color:var(--bond-gold)}._lesson_1x6hc_1 button[aria-pressed=true],._lesson_1x6hc_1 ._primary_1x6hc_185{background:var(--bond-ink);border-color:var(--bond-ink);color:var(--background,#fff)}:is(._lesson_1x6hc_1 button:focus-visible,._lesson_1x6hc_1 a:focus-visible,._lesson_1x6hc_1 input:focus-visible){outline:2px solid var(--bond-blue);outline-offset:4px}._lesson_1x6hc_1 button:disabled{opacity:.45;cursor:default}._legend_1x6hc_200{border-top:1px solid var(--bond-line);color:var(--bond-muted);flex-wrap:wrap;gap:13px 25px;padding:17px 22px;font-size:12px;display:flex}._legend_1x6hc_200 span{align-items:center;gap:7px;display:inline-flex}._dot_1x6hc_214{background:currentColor;border-radius:50%;width:8px;height:8px;display:inline-block}._caption_1x6hc_221{border-top:1px solid var(--bond-line);min-height:84px;padding:19px 23px;font-size:14px;line-height:1.75}._stableCaption_1x6hc_228{align-items:start;display:grid}._stableCaption_1x6hc_228>div{grid-area:1/1}._hiddenCaption_1x6hc_235{visibility:hidden;pointer-events:none}._symbolKey_1x6hc_239{border-block:1px solid var(--bond-line);grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin:18px 0;padding:23px 0;display:grid}._symbolKey_1x6hc_239 dt{color:var(--bond-gold);align-items:center;gap:12px;margin-bottom:10px;display:flex}._symbolKey_1x6hc_239 dt strong{color:var(--bond-ink);font-size:14px;font-weight:500}._symbolKey_1x6hc_239 dd{color:var(--bond-muted);margin:0;font-size:13px;line-height:1.8}._facts_1x6hc_265{grid-template-columns:repeat(3,minmax(0,1fr));gap:30px;margin:26px 0;display:grid}._facts_1x6hc_265>div{border-top:1px solid var(--bond-line);padding-top:21px}._facts_1x6hc_265 h3{margin:0 0 11px;font-size:17px;font-weight:500}._facts_1x6hc_265 p{color:var(--bond-muted);margin:0;font-size:14px;line-height:1.9}._note_1x6hc_286{color:var(--bond-muted);padding:17px 0;line-height:1.85;font-size:12px!important}._formula_1x6hc_292{margin:6px 0;font-size:17px;overflow-x:auto}._formula_1x6hc_292 .katex-display{text-align:left;margin:.5em 0}._formula_1x6hc_292 .katex{font-size:1em}._stepList_1x6hc_304{flex-direction:column;gap:8px;display:flex}._stepList_1x6hc_304 button{text-align:left;align-items:center;gap:13px;line-height:1.5;display:flex}._stepList_1x6hc_304 b{font-family:var(--font-mono,monospace);opacity:.6;font-weight:400}._readouts_1x6hc_321{grid-template-columns:1fr 1fr;gap:12px;display:grid}._readouts_1x6hc_321 div{border-top:1px solid var(--bond-line);padding-top:10px}._readouts_1x6hc_321 small{color:var(--bond-muted);margin-bottom:6px;font-size:11px;display:block}._readouts_1x6hc_321 strong{font-size:22px;font-family:var(--font-mono,monospace);font-weight:400}._diagram_1x6hc_341{width:100%;height:auto;color:var(--bond-ink);display:block}._diagram_1x6hc_341 text{fill:currentColor;font-family:inherit;font-size:14px}._diagram_1x6hc_341 ._small_1x6hc_352{font-size:11px}._diagram_1x6hc_341 ._label_1x6hc_355{font-size:18px;font-weight:500}._diagram_1x6hc_341 ._muted_1x6hc_359{fill:var(--bond-muted)}._shellSvg_1x6hc_362{width:100%;margin:auto 0}._shellSvg_1x6hc_362 circle{vector-effect:non-scaling-stroke}._pair_1x6hc_119{border-bottom:1px solid var(--bond-line);align-items:center;gap:10px;padding:12px 0;display:flex}._pair_1x6hc_119 small{color:var(--bond-muted);flex:1;font-size:11px}._pair_1x6hc_119 strong{min-width:28px;font-weight:500}._spin_1x6hc_385{border:1px solid;border-radius:50%;place-items:center;width:27px;height:27px;font-size:20px;line-height:1;display:inline-grid}._projectionNote_1x6hc_395{border-left:2px solid var(--bond-gold);padding-left:15px}._equation_1x6hc_399{font-family:var(--font-serif,Georgia, serif);justify-content:center;align-items:center;gap:20px;padding:22px;font-size:25px;display:flex}._bondLab_1x6hc_408{border:1px solid var(--bond-line);border-radius:14px;overflow:hidden}._bondControls_1x6hc_413{border-top:1px solid var(--bond-line);grid-template-columns:1fr 1fr;gap:28px;padding:24px;display:grid}._energyGrid_1x6hc_420{grid-template-columns:1fr 1fr;align-items:center;padding:12px;display:grid}._energyGrid_1x6hc_420>div{min-width:0}._energyGrid_1x6hc_420 p{color:var(--bond-muted);padding:0 20px;font-size:13px;line-height:1.8}._dragSurface_1x6hc_435{touch-action:none;cursor:ew-resize}._source_1x6hc_439{border-top:1px solid var(--bond-line);color:var(--bond-muted);flex-wrap:wrap;justify-content:space-between;gap:17px;margin-top:40px;padding:24px 0;font-size:12px;display:flex}._source_1x6hc_439 a{text-underline-offset:4px;text-decoration:underline}._check_1x6hc_454{border-top:1px solid var(--bond-line);border-bottom:1px solid var(--bond-line);padding:18px 0;font-size:14px;line-height:1.8}._check_1x6hc_454 summary{cursor:pointer}._check_1x6hc_454 p{color:var(--bond-muted)}._current_1x6hc_467{color:var(--bond-gold);align-items:center;gap:12px;display:flex}._current_1x6hc_467 svg{width:70px;height:15px}._fallback_1x6hc_477{color:var(--bond-muted);padding:45px;line-height:1.9}@media (max-width:980px){._bench_1x6hc_87{grid-template-columns:minmax(0,1fr) 265px}._side_1x6hc_141{padding:21px 18px}}@media (max-width:740px){._symbolKey_1x6hc_239{grid-template-columns:repeat(2,minmax(0,1fr))}._bench_1x6hc_87{grid-template-columns:1fr}._side_1x6hc_141{border-left:0;border-top:1px solid var(--bond-line)}._stage_1x6hc_105{min-height:350px}._facts_1x6hc_265{grid-template-columns:1fr;gap:20px}._energyGrid_1x6hc_420,._bondControls_1x6hc_413{grid-template-columns:1fr}._header_1x6hc_17{padding-top:32px}._section_1x6hc_62{margin:35px 0 42px}._nav_1x6hc_42{gap:10px 17px}}@media (prefers-reduced-motion:reduce){._lesson_1x6hc_1 *{scroll-behavior:auto!important;transition:none!important}}.dark ._lesson_1x6hc_1{--bond-blue:#79cce9;--bond-green:#82d0ae;--bond-gold:#e4ba72;--bond-purple:#c0a1e1}._modelInteraction_1x6hc_536{border-top:1px solid var(--bond-line);flex-wrap:wrap;align-items:center;gap:10px 16px;padding:13px 18px;font-size:12px;line-height:1.6;display:flex}._modelInteraction_1x6hc_536 label{cursor:pointer;align-items:center;gap:8px;display:inline-flex}._modelInteraction_1x6hc_536 span{color:var(--bond-muted);flex:180px}._modelInteraction_1x6hc_536 output{font-variant-numeric:tabular-nums;white-space:nowrap}._modelInteraction_1x6hc_536 button{border:1px solid var(--bond-line);min-height:36px;color:inherit;cursor:pointer;background:0 0;border-radius:6px;padding:5px 10px}._modelInteraction_1x6hc_536 button:hover{background:color-mix(in srgb, var(--bond-gold) 10%, transparent)}:is(._modelInteraction_1x6hc_536 input:focus-visible,._modelInteraction_1x6hc_536 button:focus-visible){outline:2px solid var(--bond-blue);outline-offset:3px}