._lesson_1tkn3_1{--curve:#247f84;--tangent:#7954ad;--secant:#a3680b;--error:#b85359}.dark ._lesson_1tkn3_1{--curve:#80d7d2;--tangent:#c6a6ef;--secant:#edc66a;--error:#f49390}._lesson_1tkn3_1 p{max-width:78ch}._formula_1tkn3_4{min-width:0;max-width:100%;margin:6px 0 16px;padding:12px 2px;font-size:clamp(15px,1.5vw,18px);overflow-x:auto}._bench_1tkn3_5{border:1px solid var(--border);background:var(--plot);border-radius:9px;margin:24px 0;overflow:hidden}._experiment_1tkn3_6{grid-template-columns:minmax(0,1fr) 285px;display:grid}._diagram_1tkn3_7{min-width:0;position:relative}._plot_1tkn3_8{touch-action:pan-y;width:100%;height:auto;display:block;overflow:hidden}._plot_1tkn3_8 text{fill:var(--ink);font:13px var(--font-sans)}._plot_1tkn3_8 ._tick_1tkn3_10{fill:var(--muted);font-size:12px}._plot_1tkn3_8 ._pointText_1tkn3_11{paint-order:stroke;stroke:var(--plot);stroke-width:5px;stroke-linejoin:round;font-weight:600}._plot_1tkn3_8 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var(--border);flex-direction:column;gap:18px;min-width:0;padding:22px;display:flex}._side_1tkn3_26 h3{font-size:16px;font-weight:550}._side_1tkn3_26 p{color:var(--muted);margin:0;font-size:14px;line-height:1.75}._choices_1tkn3_29,._transport_1tkn3_29{flex-wrap:wrap;gap:8px;display:flex}._choices_1tkn3_29 button,._transport_1tkn3_29 button,._practice_1tkn3_30 button{border:1px solid var(--border);background:var(--plot);min-height:40px;color:var(--ink);border-radius:5px;padding:8px 11px;font-size:13px;line-height:1.5}._choices_1tkn3_29 button[aria-pressed=true],._transport_1tkn3_29 button[aria-pressed=true],._practice_1tkn3_30 button[aria-pressed=true]{border-color:var(--accent);background:var(--soft)}._choices_1tkn3_29 button:hover,._transport_1tkn3_29 button:hover,._practice_1tkn3_30 button:hover{background:var(--soft)}._transport_1tkn3_29 button{justify-content:center;align-items:center;gap:7px;display:inline-flex}._transport_1tkn3_29 svg{width:15px;height:15px}._transport_1tkn3_29 button:disabled{opacity:.5;cursor:default}._readouts_1tkn3_36{font-variant-numeric:tabular-nums;gap:10px;display:grid}._readouts_1tkn3_36>div{justify-content:space-between;align-items:baseline;gap:12px;font-size:13px;display:flex}._readouts_1tkn3_36 dt{color:var(--muted)}._readouts_1tkn3_36 dd{text-align:right;overflow-wrap:anywhere}._legend_1tkn3_40{border-top:1px solid var(--border);color:var(--muted);flex-wrap:wrap;gap:10px 22px;padding:14px 20px;font-size:13px;display:flex}._legend_1tkn3_40 span{align-items:center;gap:7px;display:flex}._legend_1tkn3_40 i{border-top:2px solid var(--curve);width:22px;display:inline-block}._legend_1tkn3_40 ._tangentKey_1tkn3_43{border-color:var(--tangent);border-top-style:dashed}._legend_1tkn3_40 ._secantKey_1tkn3_44{border-color:var(--secant)}._caption_1tkn3_45{border-top:1px solid var(--border);background:var(--soft);color:var(--muted);padding:17px 22px;font-size:14px;line-height:1.8}._caption_1tkn3_45 p{margin:0}._reminder_1tkn3_47{border-left:2px solid var(--accent);background:var(--soft);margin:24px 0;padding:15px 20px;font-size:15px;line-height:1.85}._reminder_1tkn3_47 p{margin:0}._derivation_1tkn3_49{gap:20px;margin:24px 0;display:grid}._derivation_1tkn3_49>div{border-top:1px solid var(--border);min-width:0;padding:19px 0 0}._derivation_1tkn3_49 h3{margin-bottom:10px;font-size:17px;font-weight:550}._derivation_1tkn3_49 p{color:var(--muted);font-size:15px;line-height:1.85}._constructionControls_1tkn3_53{border-top:1px solid var(--border);gap:16px;padding:20px 22px;display:grid}._tokens_1tkn3_54{border-top:1px solid var(--border);grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;padding:20px 22px;display:grid}._tokens_1tkn3_54>div{border-top:2px solid var(--border);min-width:0;padding-top:12px}._tokens_1tkn3_54 [data-active=true]{border-color:var(--tangent)}._tokens_1tkn3_54 span{color:var(--muted);margin-bottom:7px;font-size:13px;display:block}._tokens_1tkn3_54 strong{font-variant-numeric:tabular-nums;font-size:17px;font-weight:500}._result_1tkn3_59{border-top:1px solid var(--border);min-height:70px;padding:16px 22px;font-size:15px;line-height:1.8}._result_1tkn3_59 ._formula_1tkn3_4{margin:0}._errorLayout_1tkn3_61{grid-template-columns:minmax(0,1fr) 285px;display:grid}._magnifier_1tkn3_62{border-left:1px solid var(--border);min-width:0}._magnifier_1tkn3_62 h3{padding:18px 18px 0;font-size:14px;font-weight:500;line-height:1.6}._magnifier_1tkn3_62 svg{width:100%;height:auto;display:block}._magnifier_1tkn3_62 text{font:12px var(--font-sans);fill:var(--ink)}._magnifier_1tkn3_62 p{color:var(--muted);padding:0 18px 18px;font-size:13px;line-height:1.7}._errorControls_1tkn3_67{border-top:1px solid var(--border);gap:18px;padding:22px;display:grid}._errorValues_1tkn3_68{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;display:grid}._errorValues_1tkn3_68>div{min-width:0}._errorValues_1tkn3_68 span{color:var(--muted);margin-bottom:8px;font-size:13px;display:block}._errorValues_1tkn3_68 strong{font:500 17px var(--font-mono);overflow-wrap:anywhere}._practice_1tkn3_30{background:var(--soft);border:1px solid var(--border);border-radius:8px;margin-top:22px;padding:22px}._practice_1tkn3_30 p{color:var(--muted);margin:14px 0;line-height:1.85}._next_1tkn3_74{border-top:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-top:36px;padding-top:22px;font-size:15px;display:flex}._next_1tkn3_74 a{color:var(--accent)}._next_1tkn3_74 a:last-child{align-items:center;gap:8px;display:inline-flex}._stages_1tkn3_77{gap:13px;margin:0;padding:0;list-style:none;display:grid}._stages_1tkn3_77 li{color:var(--muted);align-items:baseline;gap:9px;font-size:13px;line-height:1.7;display:flex}._stages_1tkn3_77 li>span{font:12px var(--font-mono);flex:0 0 21px}._stages_1tkn3_77 [aria-current=step]{color:var(--ink);font-weight:600}._answer_1tkn3_81{flex-wrap:wrap;align-items:center;gap:12px;margin:22px 0;display:flex}._answer_1tkn3_81 label{font-size:14px}._answer_1tkn3_81 input{width:150px;min-width:0;max-width:100%;color:var(--ink);background:var(--plot);border:1px solid var(--border);border-radius:5px;min-height:42px;padding:9px 12px;font-size:16px}@media (max-width:850px){._experiment_1tkn3_6,._errorLayout_1tkn3_61{grid-template-columns:1fr}._side_1tkn3_26,._magnifier_1tkn3_62{border-left:0;border-top:1px solid var(--border)}._side_1tkn3_26{grid-template-columns:1fr 1fr;align-items:start;display:grid}._side_1tkn3_26>:first-child,._side_1tkn3_26>p,._side_1tkn3_26>._choices_1tkn3_29,._side_1tkn3_26>._transport_1tkn3_29{grid-column:1/-1}._magnifier_1tkn3_62{grid-template-columns:1fr 1fr;display:grid}._magnifier_1tkn3_62 h3{grid-column:1/-1}._magnifier_1tkn3_62 svg{max-width:320px}._magnifier_1tkn3_62 p{align-self:center}}@media (max-width:550px){._side_1tkn3_26{padding:18px;display:flex}._tokens_1tkn3_54{grid-template-columns:1fr;gap:13px;padding:18px}._tokens_1tkn3_54>div{justify-content:space-between;align-items:baseline;gap:12px;display:flex}._tokens_1tkn3_54 span{margin:0}._errorValues_1tkn3_68{grid-template-columns:1fr;gap:15px}._errorValues_1tkn3_68>div{justify-content:space-between;gap:12px;display:flex}._errorValues_1tkn3_68 span{margin:0}._magnifier_1tkn3_62{display:block}._magnifier_1tkn3_62 svg{max-width:320px;margin:auto}._caption_1tkn3_45,._constructionControls_1tkn3_53,._errorControls_1tkn3_67,._result_1tkn3_59,._practice_1tkn3_30{padding:17px}._formula_1tkn3_4{font-size:15px}}@media (prefers-reduced-motion:reduce){._lesson_1tkn3_1 *{scroll-behavior:auto;transition:none!important}}