:root{color-scheme:light;--ink:#1b303c;--muted:#53616b;--line:#b9c8cb;--rope:#5b6f77;--first:#138895;--second:#d36a3e;--accent:#155a72;--wash:#f1f5f4}
*{box-sizing:border-box}
body{margin:0;background:#fff;color:var(--ink);font:15px/1.45 Arial,Helvetica,sans-serif}
button,input,select{font:inherit}button{cursor:pointer}a{color:#075780}
.app{max-width:1440px;margin:0 auto;padding:20px clamp(14px,3vw,42px) 40px}
.masthead{display:flex;align-items:end;justify-content:space-between;gap:24px;border-bottom:3px solid var(--ink);padding:4px 0 22px}
.eyebrow{font-size:12px;font-weight:700;text-transform:uppercase;color:var(--first);margin:0 0 5px}
h1{font-size:32px;line-height:1.12;margin:0}h2{font-size:18px;line-height:1.2;margin:0}
.lede{margin:8px 0 0;color:var(--muted)}.article-link{white-space:nowrap;font-weight:700}
.workspace{display:grid;grid-template-columns:minmax(230px,286px) minmax(0,1fr);border-bottom:1px solid var(--line)}
.controls{padding:24px 22px 24px 0;border-right:1px solid var(--line)}.controls h2{margin-bottom:13px}
.mode-switch{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--accent)}
.mode-switch button{border:0;background:#fff;color:var(--accent);font-size:13px;font-weight:700;min-height:37px;padding:5px}
.mode-switch button+button{border-left:1px solid var(--accent)}.mode-switch button[aria-pressed=true]{background:var(--accent);color:#fff}
.mode-caption{color:var(--muted);font-size:12px;min-height:54px;margin:10px 0 16px}
.control{margin-bottom:17px}.control label,.time-label{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-size:13px;font-weight:700}
.control output,.time-label output{color:var(--accent);white-space:nowrap;font-variant-numeric:tabular-nums}
.control input[type=range],#time{width:100%;accent-color:var(--first);margin:10px 0 3px}
.limits{display:flex;justify-content:space-between;color:var(--muted);font-size:11px}
.preset{margin-top:23px}.preset label{display:block;font-weight:700;font-size:13px;margin-bottom:5px}.preset select{width:100%;padding:7px;background:#fff;border:1px solid var(--line)}
.actions{display:flex;gap:8px;margin:22px 0 18px}.actions button{background:var(--accent);color:#fff;border:1px solid var(--accent);min-width:85px;min-height:37px}.actions .secondary{color:var(--accent);background:#fff}
.actions button:hover,.actions button:focus-visible{box-shadow:0 0 0 2px #a5d4d9}
.scene{min-width:0;padding:23px 0 22px 26px}.scene-heading{display:flex;justify-content:space-between;align-items:baseline;gap:18px}.scene-heading p{color:var(--muted);margin:0;font-size:13px;text-align:right;max-width:31rem}
.legend{display:flex;flex-wrap:wrap;gap:10px 20px;font-size:12px;margin:13px 0 0}.swatch{display:inline-block;vertical-align:middle;width:20px;height:4px;margin-right:6px;background:var(--rope)}.swatch.first{background:var(--first)}.swatch.second{background:var(--second)}
canvas{display:block;width:100%}#apparatus{height:440px}#displacements{height:220px}.scene-caption{font-size:12px;color:var(--muted);margin:0}
.analysis{padding:23px 0 24px;border-bottom:1px solid var(--line)}.analysis-heading{display:flex;justify-content:space-between;gap:20px;align-items:baseline}.analysis-heading p{margin:4px 0 0;color:var(--muted)}.analysis-heading strong{font-size:17px;white-space:nowrap}
.metrics{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.metrics div{padding:12px 14px;border-right:1px solid var(--line)}.metrics div:first-child{padding-left:0}.metrics div:last-child{border:0}.metrics span{display:block;font-size:12px;color:var(--muted)}.metrics strong{display:block;font-size:17px;font-variant-numeric:tabular-nums;margin-top:3px;white-space:nowrap}.force-equations{color:var(--muted);margin:12px 0 0;font-size:14px}
footer{padding-top:20px;color:var(--muted);font-size:13px}footer p{margin:0 0 10px}.text-button{padding:0;border:0;background:none;color:#075780;text-decoration:underline;font-size:inherit}
button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media(max-width:800px){.masthead{display:block}.article-link{display:inline-block;margin-top:12px}.workspace{display:block}.controls{border-right:0;border-bottom:1px solid var(--line);padding:18px 0}.mode-caption{min-height:0}.scene{padding:18px 0}.scene-heading{display:block}.scene-heading p{text-align:left;margin-top:5px}.analysis-heading{display:block}.analysis-heading strong{display:block;margin-top:8px}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.metrics div:nth-child(2n){border-right:0}.metrics div{border-bottom:1px solid var(--line)}.metrics div:last-child{border-bottom:0}}
@media(max-width:420px){h1{font-size:26px}#apparatus{height:375px}#displacements{height:200px}.legend{gap:6px 12px}.metrics strong{font-size:15px}}