/* Base + layout */
#ei-ohms-law{font:clamp(16px,1.6vw,18px)/1.55 system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;max-width:900px;margin:1rem auto;background:#fff;border:1px solid #e5e7eb;border-radius:14px;box-shadow:0 6px 20px rgba(0,0,0,.06)}
#ei-ohms-law header{padding:18px 20px;border-bottom:1px solid #eee}
#ei-ohms-law h2{margin:0;font-size:1.05em}
#ei-ohms-law .sub{color:#6b7280;font-size:.9em;margin-top:4px}
#ei-ohms-law .grid{display:grid;gap:10px;align-items:center;padding:16px 20px;grid-template-columns:1fr}
#ei-ohms-law .row{display:contents}
#ei-ohms-law label{font-weight:600;color:#374151;white-space:normal}
#ei-ohms-law .ctl{display:flex;gap:10px;align-items:center;min-width:0}

/* Controls */
#ei-ohms-law input[type=number]{flex:1 1 auto;min-width:0;width:100%;padding:.9rem 1.1rem;border:1px solid #d1d5db;border-radius:10px;background:#fff;min-height:42px;box-sizing:border-box}
#ei-ohms-law input::placeholder{color:#9ca3af}
#ei-ohms-law select{flex:0 0 160px;min-width:140px;padding:.6rem .7rem;border:1px solid #d1d5db;border-radius:10px;background:#fafafa;min-height:42px}
#ei-ohms-law input[readonly]{background:#f9fafb}
#ei-ohms-law .bar{display:flex;gap:10px;flex-wrap:wrap;justify-content:space-between;padding:12px 20px;border-top:1px solid #eee}
#ei-ohms-law button{border:1px solid #d1d5db;background:#f3f4f6;color:#111827;border-radius:10px;padding:.55rem .9rem;cursor:pointer}
#ei-ohms-law .note{padding:10px 20px;color:#6b7280;font-size:.9em}
#ei-ohms-law .err{color:#b91c1c;font-size:.9em;display:none;padding:0 20px 10px}
#ei-ohms-law .muted{color:#6b7280;font-weight:500}

/* A11y helper: visually hidden label */
#ei-ohms-law .sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;clip-path:inset(50%)!important;white-space:nowrap!important;border:0!important}

/* Hide number spinners */
#ei-ohms-law input[type=number]::-webkit-outer-spin-button,
#ei-ohms-law input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
#ei-ohms-law input[type=number]{-moz-appearance:textfield}

/* Tablets + Desktops */
@media (min-width:600px){ #ei-ohms-law .grid{grid-template-columns:220px 1fr} #ei-ohms-law label{white-space:nowrap} }
@media (min-width:1024px){ #ei-ohms-law .grid{grid-template-columns:240px minmax(420px,700px)} #ei-ohms-law select{flex:0 0 160px} }