._lesson_7es4u_1{--dio-ink:#273c40;--dio-muted:#596e73;--dio-paper:#fff;--dio-soft:#f4f7f6;--dio-grid:#e2eae7;--dio-axis:#8fa3a5;--dio-green:#15776d;--dio-gold:#a56b22;--dio-purple:#795399;color:var(--dio-ink);min-width:0;padding-bottom:72px}.dark ._lesson_7es4u_1{--dio-ink:#e0eae8;--dio-muted:#a9bebd;--dio-paper:#151f23;--dio-soft:#1b282c;--dio-grid:#2d3c40;--dio-axis:#6d858a;--dio-green:#89d8c9;--dio-gold:#f0c276;--dio-purple:#c4a3e3}._heading_7es4u_26{max-width:940px;padding:36px 0 28px}._kicker_7es4u_30{letter-spacing:.12em;color:var(--dio-gold)!important;font-size:12px!important}._heading_7es4u_26 h1{letter-spacing:-.035em;font-size:clamp(30px,4vw,48px);font-weight:500;line-height:1.3}._heading_7es4u_26 p,._chapter_7es4u_42 p{max-width:98ch;margin:18px 0;font-size:16px;line-height:1.95}._heading_7es4u_26 p{color:var(--dio-muted);font-size:18px}._navigation_7es4u_52{border-block:1px solid var(--border);color:var(--dio-muted);flex-wrap:wrap;gap:13px 28px;padding:20px 0;font-size:14px;display:flex}._navigation_7es4u_52 a:hover,._footer_7es4u_62 a:hover{color:var(--dio-gold)}._chapter_7es4u_42{padding-top:42px;scroll-margin-top:95px}._chapter_7es4u_42+._chapter_7es4u_42{border-top:1px solid var(--border);margin-top:36px}._chapter_7es4u_42>header{align-items:baseline;gap:20px;margin-bottom:24px;display:flex}._chapter_7es4u_42>header>span{color:var(--dio-gold);font:25px Georgia,serif}._chapter_7es4u_42 h2{font-size:clamp(23px,2.8vw,31px);font-weight:500;line-height:1.45}._chapter_7es4u_42 h3{margin:32px 0 15px;font-size:21px;font-weight:550;line-height:1.6}._equation_7es4u_96{border-left:2px solid var(--dio-gold);background:var(--dio-soft);max-width:100%;margin:21px 0;padding:12px 20px;font-size:17px;overflow-x:auto}._equation_7es4u_96 .katex-display{text-align:left;margin:.5em 0}._equation_7es4u_96 .katex-display>.katex{text-align:left}._note_7es4u_112{border-left:3px solid var(--dio-green);background:var(--dio-soft);margin:24px 0;padding:2px 22px}._note_7es4u_112 p{font-size:15px}._experiment_7es4u_121{border:1px solid var(--border);background:var(--dio-paper);border-radius:8px;margin:26px 0;overflow:hidden}._experiment_7es4u_121>header{border-bottom:1px solid var(--border);padding:20px 24px}._experiment_7es4u_121 h3{margin:0;font-size:19px}._controls_7es4u_136{background:var(--dio-soft);padding:20px 24px}._controls_7es4u_136 p{font-size:14px;line-height:1.85}._range_7es4u_144{margin:16px 0}._range_7es4u_144 label{justify-content:space-between;gap:16px;font-size:14px;line-height:1.6;display:flex}._range_7es4u_144 output{font-variant-numeric:tabular-nums;color:var(--dio-gold)}._range_7es4u_144 input{width:100%;min-height:32px;accent-color:var(--dio-gold);margin-top:8px}._buttons_7es4u_164{flex-wrap:wrap;gap:10px;margin:16px 0;display:flex}._lesson_7es4u_1 button{border:1px solid var(--dio-axis);background:var(--dio-paper);color:var(--dio-ink);cursor:pointer;text-align:left;border-radius:5px;min-height:42px;padding:10px 14px;font-size:14px;line-height:1.5}._lesson_7es4u_1 button:hover{border-color:var(--dio-gold)}._lesson_7es4u_1 button[aria-pressed=true]{border-color:var(--dio-green);background:var(--dio-soft);box-shadow:inset 0 -2px var(--dio-green)}._lesson_7es4u_1 button:disabled{opacity:.45;cursor:default}:is(._lesson_7es4u_1 button:focus-visible,._lesson_7es4u_1 input:focus-visible,._answer_7es4u_196 summary:focus-visible){outline:2px solid var(--dio-gold);outline-offset:4px}._readout_7es4u_200{font-family:var(--font-mono);overflow-wrap:anywhere;font-variant-numeric:tabular-nums;margin:13px 0;font-size:15px;line-height:1.9;display:block}._packs_7es4u_209{grid-template-columns:1fr 1fr;gap:24px;padding:24px;display:grid}._packs_7es4u_209 h4{margin-bottom:15px;font-size:16px;font-weight:500}._packRow_7es4u_220{flex-wrap:wrap;align-content:start;gap:8px;min-height:50px;display:flex}._pack_7es4u_209{border:1px solid var(--dio-green);border-radius:5px;gap:5px;padding:8px;display:flex}._packGold_7es4u_234{border-color:var(--dio-gold)}._dot_7es4u_237{background:var(--dio-green);border-radius:50%;width:9px;height:9px}._packGold_7es4u_234 ._dot_7es4u_237{background:var(--dio-gold)}._packControls_7es4u_246{grid-template-columns:1fr 1fr;gap:25px;display:grid}._twoColumns_7es4u_251{grid-template-columns:minmax(0,1.3fr) minmax(270px,1fr);display:grid}._plotColumn_7es4u_255{min-width:0;padding:12px 0}._plot_7es4u_255{width:100%;height:auto;display:block}._plot_7es4u_255 text{fill:var(--dio-muted);font-size:15px;font-family:var(--font-sans)}._grid_7es4u_269{stroke:var(--dio-grid);stroke-width:1px}._axis_7es4u_273{stroke:var(--dio-axis);stroke-width:1.4px}._lattice_7es4u_277{fill:var(--dio-axis);opacity:.45}._curve_7es4u_281{stroke:var(--dio-purple);stroke-width:2px;fill:none}._integer_7es4u_286{fill:var(--dio-green);stroke:var(--dio-paper);stroke-width:1.8px}._fraction_7es4u_291{fill:var(--dio-gold);stroke:var(--dio-paper);stroke-width:1.8px}._current_7es4u_296{stroke:var(--dio-gold);stroke-width:2px;fill:none}._construction_7es4u_301{stroke:var(--dio-gold);stroke-width:1.6px;stroke-dasharray:5 4;fill:none}._move_7es4u_307{stroke:var(--dio-green);stroke-width:2px;fill:none;stroke-dasharray:5 4}._chapter_7es4u_42 ._caption_7es4u_313{color:var(--dio-muted);margin:12px 22px;font-size:14px;line-height:1.8}._tableWrap_7es4u_319{max-width:100%;margin:20px 0;overflow-x:auto}._table_7es4u_319{border-collapse:collapse;font-variant-numeric:tabular-nums;width:100%;font-size:15px;line-height:1.8}._table_7es4u_319 th,._table_7es4u_319 td{border-bottom:1px solid var(--border);text-align:left;vertical-align:top;padding:10px 14px}._table_7es4u_319 th{background:var(--dio-soft);font-weight:550}._table_7es4u_319 tr[data-current=true]{background:var(--dio-soft)}._table_7es4u_319 caption{text-align:left;color:var(--dio-muted);padding:0 0 12px;line-height:1.7}._good_7es4u_351{color:var(--dio-green)}._answer_7es4u_196{border-block:1px solid var(--border);margin:22px 0;padding:18px 0}._answer_7es4u_196 summary{cursor:pointer;color:var(--dio-gold);font-size:17px;line-height:1.7}._answer_7es4u_196>p{padding-inline:12px}._factorControls_7es4u_368{padding:22px}._factorResult_7es4u_371{padding:0 22px 22px}._footer_7es4u_62{border-top:1px solid var(--border);color:var(--dio-muted);flex-wrap:wrap;gap:18px 32px;margin-top:42px;padding-top:24px;font-size:14px;display:flex}@media (max-width:900px){._twoColumns_7es4u_251{grid-template-columns:1fr}._twoColumns_7es4u_251>._controls_7es4u_136{border-top:1px solid var(--border)}}@media (max-width:620px){._lesson_7es4u_1{padding-inline:18px}._heading_7es4u_26{padding-top:24px}._heading_7es4u_26 p,._chapter_7es4u_42 p{font-size:15px}._chapter_7es4u_42>header{gap:12px}._chapter_7es4u_42 h3{font-size:19px}._chapter_7es4u_42{padding-top:30px}._equation_7es4u_96{padding:10px 12px;font-size:14px}._packs_7es4u_209{grid-template-columns:1fr;gap:20px;padding:18px}._packControls_7es4u_246{grid-template-columns:1fr;gap:0}._controls_7es4u_136,._experiment_7es4u_121>header{padding:18px}._plot_7es4u_255 text{font-size:19px}._table_7es4u_319{font-size:13px}._table_7es4u_319 th,._table_7es4u_319 td{padding:9px 10px}._navigation_7es4u_52{gap:12px 18px;font-size:13px}._answer_7es4u_196 summary{font-size:16px}._note_7es4u_112{padding-inline:16px}._readout_7es4u_200{font-size:13px}._factorControls_7es4u_368,._factorResult_7es4u_371{padding-inline:18px}}._readout_7es4u_200{white-space:pre-line}._factorCell_7es4u_461{fill:var(--dio-soft);stroke:var(--dio-green);stroke-width:1.5px}._euclidRow_7es4u_467{flex-wrap:wrap;align-items:center;gap:14px;margin:18px 0;display:flex}._euclidRow_7es4u_467 strong{min-width:62px;font-size:14px;font-weight:500}._unitGroup_7es4u_479{border:1px solid var(--dio-green);border-radius:5px;align-items:center;gap:5px;padding:8px;display:flex}._unitGroup_7es4u_479>span:first-child:not(._unit_7es4u_479){margin-right:5px;font-size:13px}._unit_7es4u_479{border:1px solid var(--dio-green);background:var(--dio-soft);width:24px;height:24px;display:block}._remainder_7es4u_498,._remainder_7es4u_498 ._unit_7es4u_479{border-color:var(--dio-gold)}