:root{color-scheme:light;font-family:system-ui,-apple-system,'Segoe UI',sans-serif;color:#334155;background:#f5f8fd;font-size:16px;line-height:1.5}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,select,input[type=number]{min-height:48px}button,select{cursor:pointer}button{border:1px solid #c7d6ee;border-radius:8px;background:white;color:#0b2a5b;padding:10px 16px;font-weight:600}button:hover{background:#eef4ff}button[aria-pressed=true]{background:#0b2a5b;color:white}a{color:#1d4ed8;text-underline-offset:3px}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #1d4ed8;outline-offset:3px}header,main,footer{max-width:1140px;margin:auto;padding:20px}header{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:10px;color:#0b2a5b;text-decoration:none;font-size:22px}.brand img{width:42px;height:41px}.brand b{font-weight:750}.languages{display:flex;gap:4px}.languages button{min-width:48px}main{padding-top:8px}h1,h2,h3{color:#0b2a5b;line-height:1.15}h1{font-size:clamp(2rem,5vw,2.8rem);margin:6px 0 12px;font-weight:650;letter-spacing:-.035em}h2{font-size:1.15rem;margin:0 0 14px}p{margin:8px 0 14px}.eyebrow{color:#1d4ed8;font-size:12px;font-weight:750;letter-spacing:.12em;text-transform:uppercase}.intro{max-width:740px}.toolbar{display:flex;gap:12px;align-items:end;flex-wrap:wrap;margin:24px 0 16px}.law-select{flex:1;min-width:0}.law-select label{display:block;font-weight:650;color:#0b2a5b;margin-bottom:5px}select{width:100%;background:white;border:1px solid #c7d6ee;border-radius:8px;padding:10px;color:#0b2a5b}.layout{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:18px}.panel{background:white;border:1px solid #d6e2f5;border-radius:14px;padding:20px;min-width:0}.model{background:#0b2347;color:#dbeafe;position:relative;overflow:hidden}.model h2{color:white}.model-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.model canvas{display:block;width:100%;height:265px}.small{font-size:13px;line-height:1.55}.model .small{color:#c5d6f0}.model button{font-size:14px;background:#17375f;color:white;border-color:#47648b}.readouts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin-top:18px}.reading{padding:10px 8px;border:1px solid #365477;border-radius:8px}.reading dt{font-size:12px;color:#b9cfea}.reading dd{font-size:19px;color:white;font-weight:650;margin:4px 0 0;font-variant-numeric:tabular-nums;overflow-wrap:anywhere}.equation{font-variant-numeric:tabular-nums;background:#eef4ff;border-radius:8px;padding:14px;color:#0b2a5b;margin-top:16px}.equation strong{font-size:22px;letter-spacing:.04em}.equation p{margin:5px 0}.control{padding:14px 0;border-bottom:1px solid #e1e8f2}.control:last-child{border:0}.control-top{display:flex;align-items:center;justify-content:space-between;gap:8px}.control label{font-weight:650;color:#0b2a5b}.badge{font-size:12px;border-radius:4px;background:#eef4ff;padding:3px 8px;color:#334155;white-space:nowrap}.control-row{display:grid;grid-template-columns:minmax(0,1fr) 102px;gap:14px;align-items:center;margin-top:4px}.control input[type=range]{width:100%;min-width:0;height:48px;margin:0;accent-color:#1d4ed8;touch-action:pan-y}.control input[type=number]{width:100%;min-width:0;border:1px solid #b3c5e0;border-radius:6px;padding:8px;font-variant-numeric:tabular-nums}.control input:disabled{opacity:.7;cursor:not-allowed;color:#334155}.control .small{margin:2px 0 0}.below{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:18px;margin-top:18px}#graph{display:block;width:100%;height:auto;aspect-ratio:500/280}#graph text{font-family:system-ui,sans-serif;font-size:12px;fill:#334155}.relation{font-size:1.5rem;color:#0b2a5b;margin:12px 0}.lesson-note{border-left:3px solid #1d4ed8;padding-left:14px}#error{color:#a51919;min-height:24px;font-size:14px;margin:6px 0}footer{font-size:14px;display:flex;gap:16px;align-items:center;flex-wrap:wrap;border-top:1px solid #d6e2f5;margin-top:24px}footer a{min-height:44px;display:inline-flex;align-items:center}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}noscript{display:block;padding:20px;background:#fff0dd} @media(max-width:760px){.layout,.below{grid-template-columns:1fr}header,main,footer{padding:16px}.panel{padding:16px}.readouts{gap:6px}.reading dd{font-size:17px}.reading{padding:8px 5px}.model canvas{height:230px}}@media(max-width:500px){.law-select{flex-basis:100%}}@media(max-width:360px){.readouts{grid-template-columns:repeat(2,minmax(0,1fr))}.control-row{grid-template-columns:minmax(0,1fr) 90px}.brand{font-size:20px}}

.zsa-languages a { display:inline-flex; align-items:center; border:1px solid #c7d6ee; border-radius:8px; padding:10px 16px; font-weight:600; text-decoration:none; min-height:48px; }