/* IES Learn library (v1.0.45). Builds on guides.css. */
.ln-hero .lead{max-width:780px}
.ln-hcount{margin-top:18px;font:600 13px/1.4 Inter,sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.ln-wrap .gd-browse{margin-bottom:34px}
.ln-wrap .gd-browse h2{font-size:15px;letter-spacing:.14em;margin:0 0 12px;color:var(--steel)}
.gd-chips a svg,.ln-xic svg,.ln-tic svg{width:18px;height:18px;flex:none;color:var(--accent-dk)}
.gd-chips a:hover{border-color:var(--navy);color:var(--navy)}
.ln-topic{padding:0;margin:0 0 46px;scroll-margin-top:110px}
.ln-thead{display:flex;gap:16px;align-items:flex-start;margin-bottom:18px;padding-top:22px;border-top:4px solid var(--navy)}
.ln-tic{flex:none;width:46px;height:46px;display:grid;place-items:center;background:var(--navy);color:var(--accent)}
.ln-tic svg{width:26px;height:26px;color:var(--accent)}
.ln-thead h2{font-size:clamp(20px,2.2vw,26px);margin:2px 0 4px;text-transform:none;letter-spacing:0}
.ln-thead h2 a:hover{text-decoration:underline;text-underline-offset:3px}
.ln-thead p{margin:0;color:var(--steel);font-size:15.5px;max-width:760px}
.ln-card{border-left-color:var(--navy)}
.ln-card:hover{border-left-color:var(--accent)}
.ln-xlink{display:flex;gap:14px;align-items:flex-start;background:var(--light);border-left:4px solid var(--accent);padding:16px 18px;margin:30px 0 8px}
.ln-xic{flex:none;width:38px;height:38px;display:grid;place-items:center;background:#fff;border:1px solid #e1e6ec}
.ln-xic svg{width:22px;height:22px}
.ln-xlink b{display:block;color:var(--navy);font:700 16px/1.35 Inter,sans-serif;margin-bottom:3px}
.ln-xlink p{margin:0;font-size:15px;line-height:1.55}
.ln-xlink a{color:#0b5cad;text-decoration:underline;text-underline-offset:2px}
.ln-ahj{background:#fffaf0;border-left:4px solid var(--accent-dk);padding:12px 16px;color:var(--charcoal)}
.ln-ahj a{color:#0b5cad;text-decoration:underline}
/* article */
.ln-take{background:var(--navy);color:#e6ecf3;padding:20px 22px;margin:22px 0 8px;border-top:4px solid var(--accent)}
.ln-take b{display:block;font:600 12px Inter,sans-serif;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:8px}
.ln-take ul{margin:0;padding-left:20px}
.ln-take li{margin:5px 0;font-size:16px;line-height:1.5}
.ln-take li::marker{color:var(--accent)}
.ln-video{margin:24px 0}
.ln-vframe{position:relative;aspect-ratio:16/9;background:#081f42}
.ln-vframe iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.ln-content>p:first-child{font-size:18.5px;color:var(--charcoal)}
.ln-content table{border-collapse:collapse;width:100%;font-size:15px;margin:14px 0;display:block;overflow-x:auto}
.ln-content th,.ln-content td{border:1px solid #e1e6ec;padding:8px 10px;text-align:left;vertical-align:top}
.ln-content th{background:var(--light);font-weight:600;color:var(--navy)}
.ln-fig{margin:26px 0;border:1px solid #e1e6ec;background:#fff}
.ln-fig .ln-svg{display:block;width:100%;height:auto}
.ln-fig figcaption{font-size:14.5px;line-height:1.5;color:var(--steel);padding:10px 14px 12px;border-top:3px solid var(--accent);background:#fbfcfd}
.ln-src{font-size:15px;line-height:1.5;padding-left:22px}
.ln-src li{margin:6px 0;overflow-wrap:anywhere}
.ln-gside p{font-size:14.5px}
.ln-gside p a{color:#0b5cad;text-decoration:underline}
/* calculators */
.ln-calc{background:var(--light);border:1px solid #e1e6ec;border-top:4px solid var(--navy);padding:18px 20px;margin:10px 0 22px}
.ln-calc-h{margin:0 0 12px}
.ln-calc-h b{display:block;color:var(--navy);font:700 17px/1.3 Inter,sans-serif}
.ln-calc-h span{display:block;font-size:14.5px;color:var(--steel);margin-top:2px}
.ln-calc-f{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px 16px;align-items:end}
.ln-calc-f label{display:flex;flex-direction:column;gap:5px;font:600 13.5px/1.35 Inter,sans-serif;color:var(--charcoal)}
.ln-calc-f .ln-wide{grid-column:1/-1}
.ln-calc input,.ln-calc select{font:16px Inter,sans-serif;padding:9px 11px;border:1px solid #c9d2db;background:#fff;color:var(--charcoal);width:100%;box-sizing:border-box;border-radius:0}
.ln-calc input:focus,.ln-calc select:focus{outline:3px solid var(--accent);outline-offset:0;border-color:var(--navy)}
.ln-calc-clear{justify-self:start;font:600 14px Inter,sans-serif;padding:10px 16px;border:1px solid var(--navy);background:#fff;color:var(--navy);cursor:pointer}
.ln-calc-clear:hover{background:var(--navy);color:#fff}
.ln-calc-out{display:block;margin-top:14px;min-height:24px;font:600 16px/1.5 Inter,sans-serif;color:var(--navy)}
.ln-calc-out:empty::before{content:"Results show here as you type.";font-weight:400;color:var(--steel);font-size:14.5px}
.ln-calc-out .ln-big{display:inline-block;background:var(--navy);color:var(--accent);padding:2px 10px;margin:0 4px 4px 0}
.ln-calc-out small{display:block;font-weight:400;color:var(--steel);font-size:14px}
.ln-calc-note{margin:10px 0 0;font-size:13px;line-height:1.45;color:var(--steel)}
@media (max-width:1000px){.ln-thead{gap:12px}}
@media (max-width:640px){
  .ln-fig{margin:20px -4px}
  .ln-take{padding:16px 16px}
  .ln-calc{padding:16px 14px}
  .ln-calc-f{grid-template-columns:1fr 1fr}
  .ln-calc-f label:has(select){grid-column:1/-1}
  .ln-tic{width:40px;height:40px}
}
@media (prefers-reduced-motion:no-preference){
  .ln-card{transition:box-shadow .2s,border-color .2s}
  .ln-calc-out .ln-big{animation:lnPop .25s ease-out}
  @keyframes lnPop{from{opacity:.3;transform:translateY(3px)}to{opacity:1;transform:none}}
}

/* v1.0.48: Learn hub banner for The Story of Electricity */
.hs-ban{display:grid;grid-template-columns:auto 1fr auto;gap:16px 20px;align-items:center;margin:0 0 34px;padding:20px 24px;background:var(--navy);color:#dfe6ee;text-decoration:none;border-left:5px solid var(--accent);box-shadow:0 12px 30px -18px rgba(11,42,87,.6);transition:transform .2s,box-shadow .2s}
.hs-ban:hover,.hs-ban:focus-visible{transform:translateY(-2px);box-shadow:0 16px 34px -16px rgba(11,42,87,.7)}
.hs-ban-ic{color:#fff;display:grid;place-items:center;width:56px;height:56px;border-radius:50%;background:rgba(255,194,14,.12);box-shadow:0 0 22px rgba(255,194,14,.35)}
.hs-ban-t small{display:block;color:var(--accent);font:700 12px/1.2 Inter,sans-serif;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}
.hs-ban-t b{display:block;color:#fff;font:800 22px/1.2 Montserrat,Arial,sans-serif;margin-bottom:4px}
.hs-ban-t span{display:block;font-size:15px;line-height:1.55}
.hs-ban-go{font:700 15px/1.2 Inter,sans-serif;color:var(--navy);background:var(--accent);padding:12px 16px;white-space:nowrap}
@media (max-width:760px){.hs-ban{grid-template-columns:auto 1fr}.hs-ban-go{grid-column:1/-1;text-align:center}}
@media (prefers-reduced-motion:reduce){.hs-ban{transition:none}.hs-ban:hover{transform:none}}
/* v1.0.50: history part 2 links under the Learn hub banner. */
.hs-ban-more{margin:-22px 0 34px;padding:10px 16px;background:#eef2f7;font-size:14.5px;line-height:1.6}
.hs-ban-more span{font:800 11.5px/1 Inter,sans-serif;text-transform:uppercase;letter-spacing:.07em;color:var(--steel);margin-right:6px}
.hs-ban-more i{font-style:normal;margin:0 6px;color:var(--steel)}
.hs-ban-more a{font-weight:700}