._lesson_g8bxf_1{--ink:#28373d;--muted:#586871;--line:#d3dce1;--gold:#89622b;--teal:#257a68;--panel:#f8fafb;--soft:#edf2f5;--button:#e8eef2;--selection:#e4efea;--edge:#657986;--mirror:#677889;max-width:1120px;color:var(--ink);margin:0 auto;padding:30px 28px 100px}.dark ._lesson_g8bxf_1{--ink:#e4e7e8;--muted:#aab2ba;--line:#39424c;--gold:#efc778;--teal:#7ad8c4;--panel:#14191d;--soft:#1d252b;--button:#252f37;--selection:#374237;--edge:#91a0af;--mirror:#f5efce}._lesson_g8bxf_1 *{box-sizing:border-box}._back_g8bxf_4{color:var(--muted);align-items:center;gap:8px;margin-bottom:32px;font-size:14px;display:inline-flex}._header_g8bxf_5{max-width:850px;padding-bottom:36px}._eyebrow_g8bxf_6{color:var(--gold);letter-spacing:.15em;text-transform:uppercase;font-size:12px}._header_g8bxf_5 h1{letter-spacing:-.035em;margin:12px 0 24px;font-size:clamp(32px,5vw,52px);font-weight:550;line-height:1.2}._lesson_g8bxf_1 p{margin:14px 0;font-size:16px;line-height:1.95}._lesson_g8bxf_1 strong{color:var(--ink);font-weight:650}._nav_g8bxf_10{border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);flex-wrap:wrap;gap:8px 22px;padding:18px 0;font-size:14px;display:flex}._nav_g8bxf_10 a:hover,._back_g8bxf_4:hover{color:var(--gold)}._section_g8bxf_12{padding-top:54px;scroll-margin-top:90px}._section_g8bxf_12+._section_g8bxf_12{border-top:1px solid var(--line);margin-top:42px}._section_g8bxf_12 h2{margin:8px 0 22px;font-size:clamp(24px,3vw,33px);font-weight:550;line-height:1.4}._section_g8bxf_12 h3{margin:26px 0 12px;font-size:20px;font-weight:550}._prose_g8bxf_16{max-width:850px}._bench_g8bxf_17{border:1px solid var(--line);background:var(--panel);border-radius:10px;min-width:0;margin:28px 0;padding:22px}._figures_g8bxf_18{grid-template-columns:repeat(3,minmax(0,1fr));align-items:start;gap:20px;display:grid}._pair_g8bxf_19{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;display:grid}._gallery_g8bxf_20{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;display:grid}._figure_g8bxf_18{min-width:0;margin:0}._figure_g8bxf_18 h4{text-align:center;min-height:24px;color:var(--gold);font-size:15px;font-weight:550}._figure_g8bxf_18 svg{width:100%;max-width:320px;margin:auto;display:block;overflow:visible}._figure_g8bxf_18 figcaption{text-align:center;color:var(--muted);overflow-wrap:anywhere;margin-top:8px;font-size:13px;line-height:1.8}._slot_g8bxf_25{fill:var(--muted);font-size:13px}._corner_g8bxf_26{text-anchor:middle;dominant-baseline:central;fill:#101821;font-size:19px;font-weight:700}._readout_g8bxf_27{color:var(--teal);overflow-wrap:anywhere;margin:18px 0;font-size:15px;line-height:1.8;display:block}._controls_g8bxf_28{flex-wrap:wrap;align-items:center;gap:10px;margin:18px 0 12px;display:flex}._controls_g8bxf_28 button,._stepList_g8bxf_29 button,._table_g8bxf_29 button,._choice_g8bxf_29{background:var(--button);color:var(--ink);cursor:pointer;border:1px solid #546170;border-radius:6px;padding:9px 14px;font-size:14px}._controls_g8bxf_28 button:hover,._stepList_g8bxf_29 button:hover,._table_g8bxf_29 button:hover{border-color:var(--gold)}._controls_g8bxf_28 button:disabled{opacity:.4;cursor:default}._controls_g8bxf_28 button:focus-visible{outline:2px solid var(--gold);outline-offset:4px}._stepList_g8bxf_29 button:focus-visible{outline:2px solid var(--gold);outline-offset:4px}._table_g8bxf_29 button:focus-visible{outline:2px solid var(--gold);outline-offset:4px}._choice_g8bxf_29:focus-visible{outline:2px solid var(--gold);outline-offset:4px}._select_g8bxf_32:focus-visible{outline:2px solid var(--gold);outline-offset:4px}._lesson_g8bxf_1 summary:focus-visible{outline:2px solid var(--gold);outline-offset:4px}._lesson_g8bxf_1 a:focus-visible{outline:2px solid var(--gold);outline-offset:4px}._stepList_g8bxf_29{flex-wrap:wrap;gap:8px;padding:0;list-style:none;display:flex}._stepList_g8bxf_29 button[aria-pressed=true],._table_g8bxf_29 button[aria-pressed=true]{background:var(--selection);border-color:var(--gold);color:var(--gold)}._hint_g8bxf_35{color:var(--muted);font-size:14px!important}._selectRow_g8bxf_36{flex-wrap:wrap;align-items:end;gap:20px;margin:18px 0 26px;display:flex}._selectRow_g8bxf_36 label{flex:1;gap:9px;min-width:190px;font-size:15px;display:grid}._select_g8bxf_32{color:var(--ink);background:var(--soft);border:1px solid #56616d;border-radius:5px;width:100%;padding:12px}._equation_g8bxf_39{border-left:2px solid var(--gold);background:var(--soft);margin:22px 0;padding:16px 20px;font-size:17px;line-height:1.9;overflow-x:auto}._tableWrap_g8bxf_40{margin:24px 0;overflow-x:auto}._table_g8bxf_29{border-collapse:collapse;width:100%;font-size:14px}._table_g8bxf_29 caption{text-align:left;color:var(--muted);margin-bottom:14px;line-height:1.8}._table_g8bxf_29 th,._table_g8bxf_29 td{border:1px solid var(--line);text-align:center;white-space:nowrap;padding:9px}._table_g8bxf_29 th{color:var(--gold);background:var(--soft);font-weight:550}._table_g8bxf_29 button{background:0 0;border-color:#0000;width:100%;min-width:50px;padding:8px}._table_g8bxf_29 ._selected_g8bxf_46{background:var(--selection)}._definition_g8bxf_47{border-left:2px solid var(--teal);margin:28px 0;padding:4px 0 4px 22px}._definition_g8bxf_47 li{margin:14px 0;padding-left:5px;font-size:16px;line-height:1.95}._definition_g8bxf_47 ol{padding-left:24px}._lesson_g8bxf_1 details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:22px 0;padding:17px 0}._lesson_g8bxf_1 summary{cursor:pointer;color:var(--gold);font-size:16px;line-height:1.8}._answer_g8bxf_52{max-width:870px;padding:6px 12px}._end_g8bxf_53{color:var(--muted);margin-top:35px}@media (max-width:720px){._lesson_g8bxf_1{padding:22px 18px 72px}._bench_g8bxf_17{padding:17px 13px}._figures_g8bxf_18{grid-template-columns:1fr;gap:24px}._pair_g8bxf_19{grid-template-columns:1fr}._gallery_g8bxf_20{grid-template-columns:1fr;gap:24px}._gallery_g8bxf_20 ._figure_g8bxf_18 h4{font-size:14px}._section_g8bxf_12{padding-top:32px}._section_g8bxf_12+._section_g8bxf_12{margin-top:28px}._lesson_g8bxf_1 p{font-size:15px;line-height:1.95}._controls_g8bxf_28 button{white-space:nowrap;flex:1}._definition_g8bxf_47{padding-left:12px}._equation_g8bxf_39{padding:14px;font-size:15px}}._wrapper_w2kfv_1{--ink:#28373d;--muted:#586871;--line:#d3dce1;--gold:#89622b;--teal:#257a68;--panel:#f8fafb;--soft:#edf2f5;color:var(--ink)}.dark ._wrapper_w2kfv_1{--ink:#e4e7e8;--muted:#aab2ba;--line:#39424c;--gold:#efc778;--teal:#7ad8c4;--panel:#14191d;--soft:#1d252b}._foundation_w2kfv_3{max-width:1120px;margin:0 auto;padding:30px 28px 0}._foundation_w2kfv_3 *{box-sizing:border-box}._back_w2kfv_5{color:var(--muted);align-items:center;gap:8px;margin-bottom:32px;font-size:14px;display:inline-flex}._header_w2kfv_6{max-width:850px}._eyebrow_w2kfv_7{color:var(--gold);letter-spacing:.13em;font-size:12px}._header_w2kfv_6 h1{letter-spacing:-.025em;margin:12px 0 40px;font-size:clamp(32px,5vw,50px);font-weight:550;line-height:1.25}._foundation_w2kfv_3 section{padding:36px 0;scroll-margin-top:90px}._foundation_w2kfv_3 section+section{border-top:1px solid var(--line)}._foundation_w2kfv_3 h2{margin:0 0 24px;font-size:clamp(24px,3vw,32px);font-weight:550;line-height:1.4}._foundation_w2kfv_3 h3{margin:28px 0 14px;font-size:21px;font-weight:550;line-height:1.6}._foundation_w2kfv_3 p{margin:16px 0;font-size:16px;line-height:1.95}._prose_w2kfv_14{max-width:850px}._nav_w2kfv_15{border-block:1px solid var(--line);color:var(--muted);flex-wrap:wrap;gap:12px 24px;padding:22px 0;font-size:14px;display:flex}._foundation_w2kfv_3 a:hover{color:var(--gold)}._operation_w2kfv_17{border-block:1px solid var(--line);text-align:center;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:28px;padding:24px 0;display:grid}._operation_w2kfv_17 span{color:var(--muted);font-size:14px}._operation_w2kfv_17 strong{color:var(--ink);margin-top:8px;font-size:26px;font-weight:500;display:block}._rules_w2kfv_20{max-width:900px}._rule_w2kfv_20{border-left:3px solid var(--gold);margin:36px 0;padding:1px 0 1px 24px}._formula_w2kfv_22{max-width:100%;padding:12px 2px;font-size:21px;overflow-x:auto}._lab_w2kfv_23{background:var(--panel);border:1px solid var(--line);border-radius:10px;margin:32px 0;padding:24px}._controls_w2kfv_24{flex-wrap:wrap;align-items:center;gap:22px;display:flex}._controls_w2kfv_24 label{grid-template-columns:1fr auto;gap:8px 18px;min-width:200px;font-size:14px;display:grid}._controls_w2kfv_24 input{width:100%;accent-color:var(--gold);grid-area:2/1}._controls_w2kfv_24 output{font-variant-numeric:tabular-nums;grid-area:2/2}._buttons_w2kfv_28{flex-wrap:wrap;align-items:center;gap:10px;display:flex}._lab_w2kfv_23 button{border:1px solid var(--line);font:inherit;color:var(--ink);background:var(--soft);cursor:pointer;border-radius:6px;padding:10px 14px;font-size:14px}._lab_w2kfv_23 button[aria-pressed=true]{background:var(--gold);color:var(--panel);border-color:var(--gold)}._lab_w2kfv_23 button:disabled{opacity:.45;cursor:default}:is(._lab_w2kfv_23 button:focus-visible,._controls_w2kfv_24 input:focus-visible){outline:3px solid var(--teal);outline-offset:3px}._diagram_w2kfv_33{padding:18px 0;overflow-x:auto}._diagram_w2kfv_33 svg{width:100%;min-width:0;font:17px system-ui,sans-serif;display:block}._readout_w2kfv_35{min-height:120px;padding:4px 0;display:block}._foundation_w2kfv_3 ._hint_w2kfv_36{color:var(--muted);font-size:14px;line-height:1.8}._derivation_w2kfv_37{padding-left:26px}._derivation_w2kfv_37 li{border-left:2px solid var(--line);padding:10px 16px}._derivation_w2kfv_37 li[data-current=true]{border-color:var(--teal);background:var(--soft)}._derivation_w2kfv_37 p{margin:0 0 12px}._application_w2kfv_42>main>header,._application_w2kfv_42>main>a:first-child{display:none}._application_w2kfv_42>main{padding-top:0}@media (max-width:640px){._diagram_w2kfv_33 svg{font-size:32px}._foundation_w2kfv_3{padding:24px 18px 0}._lab_w2kfv_23{padding:16px}._operation_w2kfv_17{grid-template-columns:1fr 1fr}._rule_w2kfv_20{padding-left:16px}._foundation_w2kfv_3 section{padding:28px 0}._derivation_w2kfv_37{padding-left:18px}._derivation_w2kfv_37 li{padding:8px}._formula_w2kfv_22{font-size:17px}}