/* IES Electric v1.0.48: "The Story of Electricity" timeline (/learn/history/). Loaded on that page only.
   Mobile first. Without JS: a plain ordered list with every stop open. With JS (.hs-js): tap to open,
   scroll reveal (.hs-anim, skipped for prefers-reduced-motion) and a glowing "current" line. */

/* ---------- hero ---------- */
.hs-hero{min-height:600px}
.hs-hero .wrap{grid-template-areas:"c c" "e l" "t l";position:relative;z-index:1}
.hs-hero .gd-crumbs{grid-area:c;align-self:start}
.hs-hero h1{text-shadow:0 2px 24px rgba(0,0,0,.45)}
.hs-hero h1::after{box-shadow:0 0 18px 2px rgba(255,194,14,.75)}
.hs-hero::before{background:linear-gradient(180deg,rgba(4,14,32,.7) 0%,rgba(4,14,32,.25) 40%,rgba(4,14,32,.85) 100%)}
.hs-hero-wave{position:absolute;left:0;right:0;bottom:18px;width:100%;height:70px;z-index:0;pointer-events:none;filter:drop-shadow(0 0 6px rgba(255,194,14,.9));opacity:.85}
.hs-hero-wave path{stroke-dasharray:1600;stroke-dashoffset:0}
.hs-anim .hs-hero-wave path{animation:hs-draw 2.8s ease-out both}
@keyframes hs-draw{from{stroke-dashoffset:1600}to{stroke-dashoffset:0}}
@media (max-width:900px){.hs-hero .wrap{grid-template-areas:"c" "e" "t" "l"}.hs-hero-wave{display:none}}

/* ---------- intro + jump chips ---------- */
.hs-wrap{padding-top:44px}
.hs-wrap>.wrap{max-width:1120px}
.hs-intro{max-width:820px;margin:0 0 40px}
.hs-intro>p{font-size:18px;line-height:1.65;margin:0 0 18px}
.hs-jump ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:10px}
.hs-jump a{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 16px;border:1px solid var(--line,#dfe3e7);background:#fff;color:var(--navy);font:600 15px/1.25 Inter,sans-serif;text-decoration:none}
.hs-jump a span{font:800 12px/1 Montserrat,Arial,sans-serif;text-transform:uppercase;letter-spacing:.06em;background:var(--navy);color:var(--accent);padding:5px 7px}
.hs-jump a:hover,.hs-jump a:focus-visible{border-color:var(--accent);box-shadow:inset 0 -3px 0 var(--accent)}
.hs-tools{margin:16px 0 0}
.hs-all{min-height:44px;padding:8px 18px;border:2px solid var(--navy);background:#fff;color:var(--navy);font:700 15px/1.2 Inter,sans-serif;cursor:pointer}
.hs-all:hover,.hs-all[aria-pressed="true"]{background:var(--navy);color:#fff}

/* ---------- era headers ---------- */
.hs-era{margin:0 0 56px;scroll-margin-top:96px}
.hs-ehead{display:flex;gap:18px;align-items:flex-start;margin:0 0 26px;padding:22px;background:var(--navy);color:#dfe6ee;border-top:5px solid var(--accent);position:relative;overflow:hidden}
.hs-ehead::after{content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,rgba(255,194,14,.28),rgba(255,194,14,0) 70%);pointer-events:none}
.hs-en{flex:none;font:800 13px/1 Montserrat,Arial,sans-serif;text-transform:uppercase;letter-spacing:.08em;color:var(--navy);background:var(--accent);padding:8px 10px;margin-top:4px}
.hs-ehead h2{color:#fff;margin:0 0 4px;font-size:clamp(24px,3vw,34px);line-height:1.15}
.hs-ehead h2::after{display:none}
.hs-span{margin:0 0 8px!important;color:var(--accent);font:600 14px/1.3 Inter,sans-serif}
.hs-ehead p{margin:0;font-size:16px;line-height:1.6;max-width:720px}

/* ---------- the line ---------- */
.hs-line{list-style:none;margin:0;padding:0 0 0 38px;position:relative;counter-reset:hs}
.hs-line::before{content:"";position:absolute;left:12px;top:6px;bottom:6px;width:3px;background:#d5dce5}
.hs-current{position:absolute;left:11px;top:6px;width:5px;height:0;background:linear-gradient(180deg,#ffe58a,var(--accent));box-shadow:0 0 10px 2px rgba(255,194,14,.75),0 0 26px 4px rgba(255,194,14,.35);border-radius:3px;pointer-events:none;z-index:1}
.hs-current::after{content:"";position:absolute;left:50%;bottom:-8px;width:16px;height:16px;margin-left:-8px;border-radius:50%;background:#fff6c9;box-shadow:0 0 0 3px rgba(255,194,14,.55),0 0 18px 6px rgba(255,194,14,.8)}
.hs-anim .hs-current::after{animation:hs-pulse 1.6s ease-in-out infinite}
@keyframes hs-pulse{50%{box-shadow:0 0 0 6px rgba(255,194,14,.25),0 0 26px 10px rgba(255,194,14,.6)}}

.hs-stop{position:relative;margin:0 0 16px;scroll-margin-top:96px}
.hs-node{position:absolute;left:-35px;top:20px;width:18px;height:18px;border-radius:50%;background:#fff;border:3px solid #b9c4d1;z-index:2;transition:background .3s,border-color .3s,box-shadow .3s}
.hs-stop.is-lit .hs-node{background:var(--accent);border-color:#fff3c4;box-shadow:0 0 0 3px var(--accent),0 0 16px 4px rgba(255,194,14,.7)}
.hs-b-safety .hs-node{border-radius:3px}
.hs-b-telecom .hs-node{border-style:double;border-width:4px}

/* ---------- cards ---------- */
.hs-card{background:#fff;border:1px solid var(--line,#dfe3e7);border-left:4px solid var(--navy);padding:16px 18px;box-shadow:0 1px 0 rgba(11,42,87,.04);transition:box-shadow .25s,border-color .25s}
.hs-stop.is-open .hs-card,.hs-card:hover{box-shadow:0 10px 30px -14px rgba(11,42,87,.35)}
.hs-stop.is-open .hs-card{border-left-color:var(--accent)}
.hs-b-california .hs-card{border-left-color:#2e7d5b}
.hs-b-safety .hs-card{border-left-color:#c0392b}
.hs-b-telecom .hs-card{border-left-color:#6b4fa0}
.hs-stop.is-open.hs-stop .hs-card{border-left-color:var(--accent)}
.hs-when{margin:0 0 4px;display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;font:800 15px/1.3 Montserrat,Arial,sans-serif;color:var(--navy);letter-spacing:.01em}
.hs-tag{font:700 11px/1 Inter,sans-serif;text-transform:uppercase;letter-spacing:.07em;padding:5px 7px;background:var(--light);color:var(--navy)}
.hs-b-safety .hs-tag{background:#fbe9e7;color:#8e2a1f}
.hs-b-telecom .hs-tag{background:#efe9f7;color:#4b3378}
.hs-b-california .hs-tag{background:#e6f3ec;color:#1f5b41}
.hs-title{margin:0;font:700 clamp(19px,2.2vw,23px)/1.25 Montserrat,Arial,sans-serif;color:var(--navy);text-transform:none;letter-spacing:0}
.hs-title::after{display:none}
.hs-tg{all:unset;box-sizing:border-box;display:flex;width:100%;align-items:flex-start;justify-content:space-between;gap:12px;cursor:pointer;min-height:44px;padding:4px 0}
.hs-tg:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
.hs-chev{flex:none;width:32px;height:32px;border-radius:50%;background:var(--light);display:grid;place-items:center;transition:transform .3s,background .3s}
.hs-chev svg{width:16px;height:16px}
.hs-tg[aria-expanded="true"] .hs-chev{transform:rotate(180deg);background:var(--accent)}
.hs-sum{display:none;margin:4px 0 0;color:var(--steel);font-size:15.5px;line-height:1.55}
.hs-js .hs-stop:not(.is-open) .hs-sum{display:block}
.hs-js .hs-stop:not(.is-open) .hs-body{display:none}
.hs-body{margin-top:12px;padding-top:14px;border-top:1px solid var(--line,#dfe3e7)}
.hs-anim .hs-stop.is-open .hs-body{animation:hs-open .35s ease-out}
@keyframes hs-open{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.hs-story{margin:0 0 14px;font-size:17px;line-height:1.7}
.hs-fact{margin:0 0 16px;padding:12px 14px;background:#fff8dc;border-left:4px solid var(--accent);font-size:16px;line-height:1.6}
.hs-fact b{display:block;font:800 12px/1.2 Montserrat,Arial,sans-serif;text-transform:uppercase;letter-spacing:.08em;color:#8a6500;margin-bottom:4px}
.hs-src{font-size:14px;line-height:1.5;color:var(--steel)}
.hs-src b{font:700 12px/1 Inter,sans-serif;text-transform:uppercase;letter-spacing:.07em;color:var(--navy)}
.hs-src ul{margin:6px 0 0;padding-left:18px}
.hs-src li{margin:0 0 4px}
.hs-src a,.hs-credit a,.hs-about a,.hs-credits a{color:#0b5cad;text-decoration:underline;text-underline-offset:2px;overflow-wrap:anywhere}
.hs-perma{display:inline-block;margin-top:12px;font-size:13px;color:var(--steel);text-decoration:underline;text-underline-offset:2px}
.hs-media{margin-top:16px;display:grid;gap:14px}
.hs-fig{margin:0;background:var(--light)}
.hs-fig img{display:block;width:100%;height:auto;max-height:440px;object-fit:contain;background:#e9edf2}
.hs-fig figcaption{padding:10px 12px;font-size:13.5px;line-height:1.5;color:var(--text)}
.hs-credit{display:block;margin-top:4px;color:var(--steel);font-size:12.5px}
.hs-svg{display:block;width:100%;height:auto;background:#0b2a57}

/* diagram motion (paused for reduced motion; SMIL is paused by the JS) */
.hs-anim .hs-spin{animation:hs-rot 6s linear infinite}
.hs-anim .hs-needle{animation:hs-wig 2.4s ease-in-out infinite}
.hs-anim .hs-glow{animation:hs-blink 2s ease-in-out infinite}
@keyframes hs-rot{to{transform:rotate(360deg)}}
@keyframes hs-wig{0%,100%{transform:rotate(-8deg)}50%{transform:rotate(14deg)}}
@keyframes hs-blink{50%{opacity:.45}}
.hs-flow{display:none}
.hs-anim .hs-flow{display:inline}

/* scroll reveal */
.hs-anim .hs-stop{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.hs-anim .hs-stop.is-in{opacity:1;transform:none}

/* ---------- coming next / about ---------- */
.hs-next{margin:10px 0 36px;padding:24px;border:2px dashed #c7d0db;background:#fff}
.hs-next h2,.hs-about h2{margin:0 0 8px;font-size:clamp(22px,2.6vw,28px)}
.hs-next ul{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:14px}
.hs-next li{padding-left:16px;border-left:3px solid var(--line,#dfe3e7);line-height:1.55}
.hs-soon{display:inline-block;margin-left:6px;font:700 11px/1 Inter,sans-serif;text-transform:uppercase;letter-spacing:.07em;padding:4px 6px;background:var(--light);color:var(--steel);vertical-align:2px}
.hs-about{margin:0 0 10px;max-width:860px}
.hs-about p{line-height:1.65}
.hs-credits{margin-top:10px}
.hs-credits summary{cursor:pointer;font-weight:700;color:var(--navy);min-height:44px;display:flex;align-items:center}
.hs-credits ul{margin:6px 0 0;padding-left:18px;font-size:14px;line-height:1.55;color:var(--steel)}
.hs-credits li{margin-bottom:6px}

/* ---------- wider screens: year column, line, card ---------- */
@media (min-width:700px){
  .hs-media{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
}
@media (min-width:960px){
  .hs-line{padding-left:206px}
  .hs-line::before{left:178px}
  .hs-current{left:177px}
  .hs-node{left:-37px;top:22px;width:20px;height:20px}
  .hs-when{position:absolute;left:-206px;top:16px;width:150px;display:block;text-align:right;font-size:18px;line-height:1.25}
  .hs-tag{display:inline-block;margin-top:8px}
  .hs-card{padding:18px 22px}
  .hs-cols{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:22px;align-items:start}
  .hs-cols>.hs-text:only-child{grid-column:1/-1;max-width:760px}
  .hs-media{margin-top:0;grid-template-columns:1fr}
  .hs-ehead{padding:26px 30px}
}
@media (prefers-reduced-motion:reduce){
  .hs-node,.hs-card,.hs-chev{transition:none}
}
@media print{
  .hs-js .hs-stop .hs-body{display:block!important}
  .hs-sum,.hs-chev,.hs-tools,.hs-current,.hs-hero-wave{display:none!important}
  .hs-anim .hs-stop{opacity:1;transform:none}
}

/* v1.0.50: live branches in "Coming next" + the 1924 stop's link to the family tree. */
.hs-next li.hs-live{border-left-color:var(--accent);padding:0}
.hs-live>a{display:block;padding:12px 16px;background:var(--light,#f3f5f8);color:var(--text);text-decoration:none;transition:background .15s}
.hs-live>a:hover,.hs-live>a:focus-visible{background:#fff6d6}
.hs-live b{color:var(--navy);font-size:17px}
.hs-new{display:inline-block;margin-left:6px;font:800 11px/1 Inter,sans-serif;text-transform:uppercase;letter-spacing:.07em;padding:4px 6px;background:var(--accent);color:var(--navy);vertical-align:2px}
.hs-nb{display:block;margin:4px 0 6px}
.hs-go{font-weight:800;color:#0b5cad}
.hs-branch-link{margin:14px 0}
.hs-branch-link a{display:inline-flex;flex-wrap:wrap;align-items:center;gap:8px;padding:10px 14px;background:var(--navy);color:#fff;font-weight:700;text-decoration:none;border-left:4px solid var(--accent)}
.hs-branch-link a:hover,.hs-branch-link a:focus-visible{background:#123a72}
.hs-branch-link span{font:800 11px/1 Inter,sans-serif;text-transform:uppercase;letter-spacing:.07em;padding:4px 6px;background:var(--accent);color:var(--navy)}

/* v1.0.50 telecom branch: "at a glance" strip and related links */
.tc-glance{list-style:none;margin:22px 0 6px;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.tc-glance li{min-width:0;background:var(--navy,#0b2a57);color:#dfe6ee;padding:14px 16px;border-left:4px solid #ffc20e}
.tc-glance b{display:block;font:800 24px/1.1 Inter,sans-serif;color:#ffc20e;margin-bottom:4px}
.tc-glance span{display:block;font:500 13.5px/1.4 Inter,sans-serif}
.tc-more{padding:0}
.tc-wrap .hs-b-telecom .hs-node{border-color:#6b4fa0}
@media (max-width:860px){.tc-glance{grid-template-columns:repeat(2,minmax(0,1fr))}.tc-glance b{font-size:20px}}
/* v1.0.51: Baby Bells tree and IES note inside the telecom page */
.tc-tree{margin:8px 0 36px;padding:22px 0 0;border-top:1px solid var(--line,#e1e6ec)}
.tc-tree-h{margin:0 0 10px;font-size:clamp(22px,2.4vw,28px)}
.tc-tree .tr-list>h3{margin:0 0 6px;font-size:22px}
.tc-tree .tc-lg-h{margin:0 0 4px;font-size:19px}
.tc-tree .tr-list{margin:20px 0 10px}
.tc-ies{margin:6px 0 34px;padding:16px 20px;background:var(--light,#f3f5f8);border-left:4px solid var(--accent,#ffc20e)}
.tc-ies p{margin:0;font-size:16px;line-height:1.6}