:root{color-scheme:light;--ink:#17324a;--muted:#5a6b78;--line:#bacbd2;--orbit:#a8bcc8;--velocity:#168297;--acceleration:#d65f37;--x:#276dad;--y:#4e8749;--accent:#154c6a}
*{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(--velocity);margin:0 0 5px}
h1{font-size:clamp(25px,3vw,36px);line-height:1.1;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(220px,280px) 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:22px}
.control{margin-bottom:19px}.control label,.time-label{display:flex;justify-content:space-between;gap:10px;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(--velocity);margin:11px 0 4px}
.limits{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}
.switches{display:grid;gap:8px;margin:12px 0 22px;font-size:13px}.switches label{display:flex;align-items:center;gap:7px}.switches input{accent-color:var(--velocity)}
.actions{display:flex;gap:8px;margin:6px 0 18px}.actions button{background:var(--accent);color:white;border:1px solid var(--accent);min-width:82px;min-height:36px}.actions .secondary{color:var(--accent);background:white}
.actions button:hover,.actions button:focus-visible{box-shadow:0 0 0 2px #9dced6}
.preset{margin-top:22px}.preset label{display:block;font-weight:700;margin-bottom:6px}.preset select{width:100%;max-width:100%;padding:6px;background:white;border:1px solid var(--line)}
.scene{min-width:0;padding:23px 0 22px 26px}.scene-heading{display:flex;justify-content:space-between;gap:18px;align-items:baseline}.scene-heading p{color:var(--muted);margin:0}
.legend{display:flex;flex-wrap:wrap;gap:10px 20px;font-size:13px;margin:13px 0 0}.swatch{display:inline-block;vertical-align:middle;width:19px;height:3px;margin-right:5px;background:var(--orbit)}.swatch.velocity{background:var(--velocity)}.swatch.acceleration{background:var(--acceleration)}.swatch.xpos{background:var(--x)}.swatch.ypos{background:var(--y)}
canvas{display:block;width:100%}#orbit{height:440px}#components{height:240px}.scene-caption{font-size:12px;color:var(--muted);margin:0}
.analysis{padding:22px 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 .equation{font-size:16px;color:var(--ink);font-weight:700;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:18px;font-variant-numeric:tabular-nums;margin-top:3px}.comparison{color:var(--muted);margin:13px 0 0}
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}.controls h2{margin-bottom:14px}.scene{padding:18px 0}.scene-heading{display:block}.scene-heading p{margin-top:5px}.analysis-heading{display:block}.analysis-heading .equation{margin-top:8px}.metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.metrics div:nth-child(2n){border-right:0}.metrics div:last-child{border-top:1px solid var(--line)}.metrics div:nth-child(-n+3){border-bottom:1px solid var(--line)}}
@media(max-width:420px){#orbit{height:340px}.legend{gap:5px 10px}.metrics strong{font-size:16px}}