/* Physics reading and comparison workbench, scoped to the teaching section. */
.movement-page .physics-chapters{grid-template-columns:repeat(5,minmax(0,1fr))}
.movement-page .physics-chapters button{padding:16px 14px;gap:12px}
.physics-lab{--pl-ink:#244638;--pl-muted:#526757;--pl-line:#d2dbcd;--pl-gold:#ab7e39;color:var(--pl-ink)}
.physics-lab *{box-sizing:border-box}
.physics-lab .eyebrow{color:#82612f;font-size:12px;letter-spacing:.1em;font-weight:700}
.physics-lab h2{font:500 clamp(28px,3vw,42px)/1.15 Georgia,serif;letter-spacing:-.025em;margin:12px 0 16px}
.physics-lab p{line-height:1.7;color:var(--pl-muted)}
.pl-intro{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(240px,.6fr);gap:40px;align-items:center;padding:12px 4px 28px}
.pl-intro p{max-width:670px;margin:0;font-size:17px}
.pl-route{list-style:none;padding:0;margin:0;display:grid;gap:14px}
.pl-route li{display:flex;align-items:center;gap:14px;font-size:14px}
.pl-route b{font:500 22px Georgia,serif;color:#9b773e;width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--pl-line);border-radius:50%}
.pl-selector{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;padding:7px;background:#e8ede3;border:1px solid #d9e0d3;border-radius:14px;margin-bottom:18px}
.pl-selector button{display:flex;align-items:center;gap:10px;padding:14px 18px;min-height:54px;background:transparent;border:1px solid transparent;border-radius:9px;color:#516750;font-family:inherit;font-size:15px;line-height:1.4;font-weight:600;cursor:pointer}
.pl-selector button span{font:400 19px Georgia,serif;color:#8d703c}
.pl-selector button[aria-pressed=true]{background:#fffef9;border-color:#d9dfd0;color:#234638;box-shadow:0 3px 12px #243b2310}
.pl-experiment{border:1px solid var(--pl-line);border-radius:20px;background:#fffef9;overflow:hidden}
.pl-experiment>header{padding:30px 32px 26px;max-width:1000px}
.pl-experiment h3{font-size:clamp(23px,2.2vw,29px);line-height:1.25;margin:12px 0}
.pl-experiment>header p{font-size:16px;margin:0;max-width:850px}
.pl-workbench{display:grid;grid-template-columns:minmax(250px,.75fr) minmax(0,1.25fr);gap:24px;padding:0 28px 24px;align-items:start}
.pl-controls{border-top:1px solid var(--pl-line);padding:25px 4px 0;min-width:0}
.pl-control{margin:0 0 22px}
.pl-control label{font-size:15px;line-height:1.45;font-weight:650;display:block}
.pl-control-value{margin:7px 0 0}.pl-control output{font-size:29px;font-weight:700;line-height:1.4;font-variant-numeric:tabular-nums}
.pl-control output small{font-size:15px;font-weight:500}
.physics-lab input[type=range]{width:100%;min-height:44px;margin:0;accent-color:#355b43;cursor:pointer}
.pl-range-ends{display:flex;justify-content:space-between;font-size:12px;color:#68765f;margin-top:-3px}
.pl-preset-label{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.07em;color:#677659;margin:26px 0 10px}
.pl-presets{display:flex;flex-wrap:wrap;gap:7px}
.physics-lab .pl-presets button{border:1px solid #c6d1be;padding:10px 12px;background:#fffef9;color:#34543c;font-size:13px;line-height:1.4;border-radius:8px;min-height:44px;cursor:pointer}
.physics-lab .pl-presets button[aria-pressed=true]{background:#ecf1e6;border-color:#80976b;box-shadow:inset 0 -2px #80976b}
.pl-controls .pl-fixed{font-size:13px;line-height:1.65;margin:22px 0 0;border-top:1px solid var(--pl-line);padding-top:16px}
.pl-chart{margin:0;background:linear-gradient(145deg,#183c32,#112922);color:#f6f2e8;border:1px solid #254c3f;border-radius:15px;padding:24px 20px 20px;min-width:0;box-shadow:0 8px 24px #1e39240a}
.pl-chart-result{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;padding:0 4px 15px;border-bottom:1px solid #69867852;min-height:94px}
.pl-chart-result>div>span{display:block;font-size:13px;color:#c6d6cb;line-height:1.4}
.pl-chart-result strong{display:block;font-size:38px;line-height:1.3;color:#f5d399;font-variant-numeric:tabular-nums;margin-top:5px}
.pl-chart-result strong small{font-size:18px;font-weight:500}
.pl-chart-result p{color:#d7e4d7;font-size:13px;line-height:1.5;text-align:right;margin:0 0 8px;max-width:160px}
.pl-chart svg{display:block;width:100%;height:auto;max-height:390px;margin:17px auto 5px;overflow:hidden}
.pl-chart svg text{font:17px system-ui,sans-serif;fill:#cbdcd1}
.pl-chart svg .pl-axis-title{font-size:17px;fill:#e3ebe3}.pl-chart .pl-grid{stroke:#7d9a8947;stroke-width:1}
.pl-chart .pl-curve{fill:none;stroke:#8dcac1;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.pl-chart .pl-guide{fill:none;stroke:#e6bd79;stroke-width:1.5;stroke-dasharray:5 6;opacity:.7}
.pl-chart .pl-reference-point{fill:#18382e;stroke:#f5f3e6;stroke-width:3}
.pl-chart .pl-active-point{fill:#e6bd79;stroke:#18382e;stroke-width:2}
.pl-chart .pl-area{fill:#e6bd792b;stroke:#e6bd79;stroke-width:3;stroke-linejoin:round}
.pl-chart .pl-reference-line{fill:none;stroke:#eef1e6;stroke-width:2.5;stroke-dasharray:7 6;stroke-linejoin:round}
.pl-chart .pl-arm{stroke:#87d4b9;stroke-width:3;stroke-dasharray:6 4}.pl-chart .pl-arm-label{fill:#a1e2c9}
.pl-chart figcaption{display:flex;flex-wrap:wrap;gap:10px 22px;font-size:12px;color:#cedcd1;line-height:1.5;border-top:1px solid #69867852;padding:15px 4px 0}
.pl-chart figcaption>span{display:flex;align-items:center;gap:8px}.pl-chart figcaption>small{flex-basis:100%;font-size:12px;color:#a8c3b1}
.pl-legend-current{width:9px;height:9px;background:#e6bd79;border-radius:50%}.pl-legend-reference{width:9px;height:9px;border:1.5px solid #fffef3}
.pl-reading{display:grid;grid-template-columns:110px 1fr;gap:22px;margin:0 28px 25px;padding:20px 22px;background:#f0f3ea;border:1px solid #e0e5d9;border-radius:10px;align-items:start}
.pl-reading b{font-size:14px;line-height:1.7}.pl-reading p{font-size:14px;margin:0}
.pl-explanation{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));padding:25px 30px;border-block:1px solid var(--pl-line);gap:28px}
.pl-explanation section+section{border-left:1px solid var(--pl-line);padding-left:28px}
.pl-explanation h4{font-size:18px;line-height:1.4;margin:12px 0}.pl-explanation p{font-size:14px;margin:0}
.pl-details{padding:0 30px}.pl-details>summary{font-weight:600;cursor:pointer;padding:22px 0;font-size:15px;line-height:1.6}
.pl-calculation{padding:0 0 24px;max-width:900px}.pl-calculation>p{font-size:14px;margin:0 0 8px}.pl-calculation>strong{display:block;font-size:19px;line-height:1.6;overflow-wrap:anywhere}
.pl-calculation table{width:100%;border-collapse:collapse;margin-top:18px;font-size:14px;text-align:left}.pl-calculation caption{text-align:left;font-weight:600;margin:0 0 10px}.pl-calculation th,.pl-calculation td{padding:12px 10px;border-bottom:1px solid var(--pl-line)}
.pl-calculation dl{display:grid;gap:18px;padding-top:18px}.pl-calculation dt{font-weight:650;font-size:15px}.pl-calculation dd{font-size:14px;line-height:1.7;margin:4px 0 0;color:var(--pl-muted)}
.pl-limit{display:flex;align-items:center;justify-content:space-between;gap:24px;background:#f8f7f0;border-top:1px solid var(--pl-line);padding:18px 30px}
.pl-limit p{font-size:12px;max-width:650px;margin:0}
.pl-limit button,.pl-case-body>button{padding:10px 0;border:0;background:transparent;font-size:13px;font-weight:650;text-align:left;line-height:1.5;color:#345e45;min-height:44px;cursor:pointer;text-decoration:underline;text-underline-offset:4px}
.pl-cases{margin-top:40px}.pl-cases>header{max-width:800px;margin-bottom:24px}.pl-cases h2{font-size:clamp(26px,3vw,34px)}.pl-cases>header p{font-size:15px}
.pl-cases-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:start}
.pl-case{border:1px solid var(--pl-line);background:#fffef9;border-radius:12px;min-width:0;overflow:hidden}
.pl-case>summary{display:flex;align-items:center;gap:17px;padding:22px;list-style:none;cursor:pointer;min-height:120px}
.pl-case>summary::-webkit-details-marker{display:none}.pl-case-number{color:#ad8446;font:500 24px Georgia,serif}.pl-case>summary small{display:block;font-size:12px;color:#6e795f;margin-bottom:7px}.pl-case>summary strong{display:block;font-size:17px;line-height:1.4}
.pl-case-toggle{font-size:24px;font-weight:400;margin-left:auto;flex-shrink:0;color:#7c906e}.pl-case[open] .pl-case-toggle{transform:rotate(45deg)}
.pl-case-body{padding:0 24px 20px;border-top:1px solid #e1e7d9}.pl-case-body p{font-size:14px;margin:12px 0;line-height:1.75}.pl-case-body h3{font-size:15px;margin:22px 0 8px}.pl-case-body .pl-situation{padding:17px 19px;border-left:3px solid #ae874d;background:#f5f1e7;margin-top:20px}
.pl-question{border-block:1px solid var(--pl-line);margin:20px 0 10px}.pl-question>summary{cursor:pointer;padding:16px 0;font-size:14px;font-weight:600;line-height:1.6}.pl-question p{margin:0 0 18px}
.physics-lab :is(button,input,summary):focus-visible{outline:3px solid #bb8e43;outline-offset:3px}
@media(max-width:1250px){.movement-page .physics-chapters{grid-template-columns:repeat(3,minmax(0,1fr))}.pl-explanation{grid-template-columns:1fr;gap:22px}.pl-explanation section+section{border-left:0;border-top:1px solid var(--pl-line);padding:22px 0 0}.pl-explanation p{max-width:820px}.pl-intro{gap:24px}.pl-workbench{grid-template-columns:minmax(220px,.7fr) minmax(0,1.3fr);gap:20px}}
@media(max-width:900px){.pl-intro{grid-template-columns:1fr}.pl-route{grid-template-columns:repeat(3,1fr);gap:12px}.pl-route li{align-items:flex-start;font-size:12px;line-height:1.5}.pl-route b{flex:0 0 28px;width:28px;height:28px;font-size:17px}.pl-workbench{grid-template-columns:1fr}.pl-chart{grid-row:1}.pl-controls{display:grid;grid-template-columns:1fr 1fr;column-gap:28px;padding-top:20px}.pl-preset-label,.pl-presets,.pl-controls .pl-fixed{grid-column:1/-1}.pl-preset-label{margin-top:2px}.pl-chart svg{max-height:360px}.pl-limit{align-items:flex-start;flex-direction:column;gap:8px}}
@media(max-width:600px){.movement-page .physics-chapters{grid-template-columns:1fr 1fr}.movement-page .physics-chapters button:first-child{grid-column:1/-1;min-height:64px}.physics-lab h2{font-size:29px}.pl-intro{padding:8px 0 20px;gap:20px}.pl-intro p{font-size:15px}.pl-route{gap:10px}.pl-route li{display:block}.pl-route b{margin-bottom:8px}.pl-selector{gap:3px;padding:4px}.pl-selector button{padding:12px 8px;font-size:13px;display:block;text-align:left;line-height:1.45;min-height:80px}.pl-selector button span{display:block;font-size:16px;margin-bottom:5px}.pl-experiment{border-radius:14px}.pl-experiment>header{padding:23px 19px 22px}.pl-experiment h3{font-size:24px;line-height:1.25}.pl-experiment>header p{font-size:15px}.pl-workbench{padding:0 12px 18px;gap:18px}.pl-chart{padding:20px 10px 15px;border-radius:11px}.pl-chart-result{padding-inline:5px;gap:10px}.pl-chart-result strong{font-size:32px}.pl-chart-result>div>span{font-size:12px}.pl-chart-result p{font-size:12px;max-width:110px}.pl-chart svg{margin-top:18px}.pl-chart svg text{font-size:19px}.pl-chart svg .pl-axis-title{font-size:19px}.pl-chart figcaption{padding-inline:5px;gap:8px 18px}.pl-controls{padding:18px 8px 0;grid-template-columns:1fr}.pl-control{margin-bottom:20px}.pl-control label{font-size:15px}.pl-reading{grid-template-columns:1fr;gap:6px;padding:16px;margin:0 19px 22px}.pl-explanation{padding:22px 19px;gap:20px}.pl-explanation p{font-size:15px}.pl-details{padding:0 19px}.pl-limit{padding:17px 19px}.pl-limit p{font-size:13px}.pl-cases{margin-top:32px}.pl-cases h2{font-size:28px}.pl-cases-grid{grid-template-columns:1fr;gap:10px}.pl-case>summary{padding:18px;gap:14px;min-height:110px}.pl-case>summary strong{font-size:16px}.pl-case-body{padding:0 18px 18px}.pl-case-body p{font-size:15px}.pl-calculation th,.pl-calculation td{padding-inline:4px}}
@media(max-width:360px){.pl-chart svg text,.pl-chart svg .pl-axis-title{font-size:24px}}