/* ============ eCircuitCalc — Battery & Energy suite (shared) ============ */
.calc-layout{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;align-items:start;margin-top:1.4rem}
@media(max-width:900px){.calc-layout{grid-template-columns:1fr}}
.calc-controls,.calc-visual{display:flex;flex-direction:column;gap:1.2rem}
.calc-card{padding:1.6rem}
.calc-card h2{font-size:1.15rem;margin-bottom:.35rem}
.calc-card .sub{color:var(--text2);font-size:.9rem;margin-bottom:1.1rem}

/* Field + unit alignment (grid — input wide, dropdown compact) */
.field{margin-bottom:1rem;position:relative}
.field label{display:block;font-size:.9rem;font-weight:500;margin-bottom:.4rem}
.ctl{display:grid;grid-template-columns:1fr auto;gap:.5rem;align-items:center}
.ctl input{width:100%;min-width:0;padding:.6rem .8rem;border-radius:10px;border:1px solid var(--border2);background:var(--surface);color:var(--text);font:inherit}
.ctl select{width:auto;max-width:9rem;padding:.6rem .7rem;border-radius:10px;border:1px solid var(--border2);background:var(--surface);color:var(--text);cursor:pointer}
.ctl .unit{font-family:var(--mono);color:var(--text2);min-width:26px}
.ctl input:focus,.ctl select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px var(--glow)}
.field.solving .ctl input{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--surface));cursor:default}
.field.solving::after{content:"AUTO";position:absolute;top:.35rem;right:.6rem;font-family:var(--mono);font-size:.6rem;letter-spacing:.12em;color:var(--accent);opacity:.85}

/* Segmented control */
.seg{display:inline-flex;gap:.3rem;flex-wrap:wrap;border:1px solid var(--border2);border-radius:11px;padding:.28rem;margin-bottom:1.1rem;background:var(--surface2)}
.seg button{padding:.5rem 1rem;border-radius:8px;font-weight:600;font-size:.88rem;color:var(--text2);transition:.2s var(--ease)}
.seg button[aria-pressed="true"]{background:var(--grad);color:#fff}
.seg button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* Results */
.res-big{font-family:var(--mono);font-size:clamp(1.8rem,5vw,2.5rem);font-weight:700;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:.6rem}
.result-row{display:flex;justify-content:space-between;gap:1rem;padding:.5rem 0;
  border-bottom:1px dashed var(--border);font-size:.92rem}
.result-row:last-child{border-bottom:0}
.result-row span{color:var(--text2)}
.result-row b{font-family:var(--mono);text-align:right}

/* Description */
.calc-desc{margin-top:2.4rem;padding:1.8rem;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border)}
.calc-desc h2{font-size:1.2rem;margin-bottom:.8rem}
.calc-desc h3{font-size:1rem;margin:1rem 0 .4rem}
.calc-desc p{color:var(--text2);margin-bottom:.9rem}
.calc-desc p:last-child{margin-bottom:0}
.calc-desc .formula{font-family:var(--mono);font-size:.92rem;color:var(--text);
  background:var(--bg2);border:1px solid var(--border);border-radius:10px;padding:.7rem .9px;display:inline-block;margin:.2rem 0}

.field-error{color:#f87171;font-size:.85rem;margin-top:.6rem;display:none}
.field-error.show{display:block}

/* Animated circuit / technical illustration */
.circuit-card{padding:1.4rem;background:var(--bg2);
  background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:22px 22px}
.circuit-card svg{width:100%;height:auto;display:block}
.circuit-card .flow{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;
  stroke-dasharray:12 16;animation:batflow 1.1s linear infinite;filter:drop-shadow(0 0 5px var(--glow))}
.circuit-card .wave{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;
  stroke-dasharray:12 14;animation:batflow 1s linear infinite;filter:drop-shadow(0 0 4px var(--glow))}
.circuit-card .w{fill:none;stroke:var(--wbase);stroke-width:3;stroke-linecap:round}
.circuit-card .c{fill:none;stroke:var(--cw);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}
.circuit-card .ct{fill:var(--text);font-family:var(--mono);font-size:13px}
.circuit-card .cm{fill:var(--text2);font-family:var(--mono);font-size:11px}
.circuit-card .dot{fill:var(--cw)}
.circuit-card .pulse{transform-origin:center;animation:batpulse 1.8s ease-in-out infinite}
@keyframes batflow{to{stroke-dashoffset:-28}}
@keyframes batpulse{0%,100%{opacity:.35}50%{opacity:.9}}
@media (prefers-reduced-motion:reduce){.circuit-card .flow,.circuit-card .wave,.circuit-card .pulse{animation:none}}

/* Misc */
.btn-sm{padding:.55rem 1.1rem;font-size:.88rem;border-radius:10px}
.cap-note{font-size:.85rem;color:var(--text2);margin-top:.9rem;line-height:1.6}
.cap-note code{font-family:var(--mono);color:var(--accent)}
.ad-slot{margin:2rem auto 0;max-width:728px;text-align:center;
  transition:max-height .5s var(--ease),opacity .4s,margin .5s;max-height:160px;overflow:hidden}
.ad-slot.ad-hidden{max-height:0;opacity:0;margin:0}
.ad-label{display:block;font-family:var(--mono);font-size:.62rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--text2);opacity:.6;margin-bottom:.4rem}
.ad-box{min-height:90px;border:1.5px dashed var(--border2);border-radius:12px;
  display:grid;place-items:center;color:var(--text2);font-size:.85rem;background:var(--surface)}
.rc-back{margin-top:2rem;text-align:center}
.rc-back a{color:var(--accent);font-weight:600;font-size:.92rem}

/* Dynamic battery list (Series / Parallel) */
.batt-list{display:flex;flex-direction:column;gap:.6rem;margin-bottom:1rem}
.batt-row{display:grid;grid-template-columns:1fr 1fr auto;gap:.5rem;align-items:center;
  padding:.55rem;border:1px solid var(--border);border-radius:10px;background:var(--surface2)}
.batt-row .ctl{grid-template-columns:1fr auto;min-width:0}
.batt-row .ctl input{padding:.5rem .6rem}
.batt-row .ctl select{padding:.5rem .5rem;max-width:5.5rem}
.batt-rm{width:34px;height:34px;border-radius:9px;border:1px solid var(--border2);
  background:var(--surface);color:var(--text2);font-size:1.2rem;line-height:1;
  display:grid;place-items:center;transition:.2s}
.batt-rm:hover{color:#f87171;border-color:#f87171}
.batt-rm:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media(max-width:520px){.batt-row{grid-template-columns:1fr 1fr}.batt-rm{grid-column:2;justify-self:end}}