@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600&display=swap');

:root{
  --paper:#f7f7f5;
  --surface:#ffffff;
  --ink:#1d201f;
  --muted:#686d69;
  --line:#dedfdb;
  --accent:#315c55;
  --accent-soft:#edf3f0;
  --max:1180px;
  --reading:760px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Source Serif 4", Georgia, serif;
  font-size:18px;
  line-height:1.78;
}
a{color:inherit}
.site-header{
  border-bottom:1px solid var(--line);
  background:rgba(247,247,245,.96);
}
.header-inner{
  max-width:var(--max);
  margin:auto;
  min-height:72px;
  padding:0 28px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.wordmark{
  font-family:"DM Sans",Arial,sans-serif;
  font-size:20px;
  font-weight:700;
  text-decoration:none;
  letter-spacing:-.03em;
}
.wordmark span{font-weight:400}
.site-header nav{
  display:flex;
  gap:24px;
  font:500 14px/1.2 "DM Sans",Arial,sans-serif;
}
.site-header nav a{text-decoration:none;color:var(--muted)}
.site-header nav a:hover{color:var(--ink)}

.page-shell{padding:54px 28px 80px}
.article-layout{
  max-width:var(--max);
  margin:auto;
  display:grid;
  grid-template-columns:minmax(0,var(--reading)) 220px;
  gap:74px;
  align-items:start;
}
.article-header{margin-bottom:34px}
.eyebrow{
  margin:0 0 18px;
  font:700 12px/1.2 "DM Sans",Arial,sans-serif;
  letter-spacing:.16em;
  color:var(--accent);
}
h1,h2,h3{
  font-family:"DM Sans",Arial,sans-serif;
  letter-spacing:-.035em;
  line-height:1.13;
  color:#171918;
}
h1{
  margin:0;
  max-width:900px;
  font-size:clamp(42px,6vw,68px);
  font-weight:700;
}
.dek{
  margin:22px 0 18px;
  max-width:720px;
  color:#565b57;
  font-size:21px;
  line-height:1.55;
}
.byline{
  display:flex;
  gap:9px;
  align-items:center;
  color:var(--muted);
  font:500 13px/1.4 "DM Sans",Arial,sans-serif;
}
.hero-figure{
  margin:38px 0 0;
  min-height:300px;
  border:1px solid var(--line);
  background:#eceeea;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  position:relative;
  overflow:hidden;
}
.hero-figure:before,.hero-figure:after{
  content:"";
  position:absolute;
  border:1px solid #d8dad5;
  border-radius:50%;
}
.hero-figure:before{width:410px;height:410px}
.hero-figure:after{width:270px;height:270px}
.battery-art{position:relative;z-index:1;transform:scale(1.05)}
.battery-cap{
  width:42px;height:16px;background:#303633;margin:0 auto -1px;border-radius:5px 5px 0 0;
}
.battery-body{
  width:142px;height:190px;border:8px solid #303633;background:#fafbf9;border-radius:16px;
  position:relative;display:flex;align-items:center;justify-content:space-between;padding:18px 14px;
  font:700 28px/1 "DM Sans",Arial,sans-serif;
}
.battery-level{
  position:absolute;left:18px;right:18px;bottom:18px;height:82px;background:#c8d7d1;border-radius:6px;
}
.battery-body span{position:relative;z-index:2}
.hero-figure p{
  position:absolute;bottom:10px;left:14px;right:14px;text-align:center;
  margin:0;color:#737874;font:400 11px/1.4 "DM Sans",Arial,sans-serif;
}

.editorial-note{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:18px 0;
  margin-bottom:42px;
  font-size:15px;
  line-height:1.6;
  color:#555a56;
}
.editorial-note p{margin:4px 0 0}
.editorial-note strong{
  font:700 11px/1.2 "DM Sans",Arial,sans-serif;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink);
}
.article-body h2{
  font-size:32px;
  margin:62px 0 18px;
}
.article-body h3{
  font-size:21px;
  margin:32px 0 10px;
}
.article-body p{margin:0 0 22px}
.article-body strong{font-weight:600}
blockquote{
  margin:34px 0;
  padding:4px 0 4px 25px;
  border-left:3px solid var(--accent);
  font-size:23px;
  line-height:1.55;
  color:#343936;
}
.summary-list{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.summary-list>div{
  display:grid;
  grid-template-columns:150px 1fr;
  gap:22px;
  padding:15px 0;
  border-bottom:1px solid var(--line);
  font-size:16px;
  line-height:1.55;
}
.summary-list>div:last-child{border-bottom:0}
.summary-list strong{font-family:"DM Sans",Arial,sans-serif;font-size:13px}
.summary-list span{color:#555a56}

table{
  width:100%;
  border-collapse:collapse;
  margin:28px 0 12px;
  font-size:15px;
  line-height:1.5;
  background:var(--surface);
  border:1px solid var(--line);
}
caption{
  text-align:left;
  caption-side:top;
  padding:0 0 9px;
  color:var(--muted);
  font:500 12px/1.4 "DM Sans",Arial,sans-serif;
}
th,td{padding:13px 15px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left}
th{font:600 12px/1.4 "DM Sans",Arial,sans-serif;background:#f1f2ef}
tr:last-child td{border-bottom:0}

.editorial-list{
  padding-left:25px;
  margin:0 0 26px;
}
.editorial-list li{padding:3px 0}
.positive li::marker{color:var(--accent)}
.caution li::marker{color:#7d6a3e}

.contextual-cta{
  margin:46px 0;
  padding:20px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  font-size:16px;
}
.contextual-cta p{margin:0}
.text-link{font-weight:600;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.button-link{
  display:inline-block;
  margin-left:7px;
  padding:9px 14px;
  border:1px solid #9fa8a3;
  border-radius:5px;
  font:600 13px/1.2 "DM Sans",Arial,sans-serif;
  text-decoration:none;
  background:transparent;
}
.button-link:hover{background:var(--accent-soft);border-color:var(--accent)}

details{
  border-top:1px solid var(--line);
  padding:17px 0;
}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{
  cursor:pointer;
  list-style:none;
  padding-right:30px;
  position:relative;
  font:600 16px/1.4 "DM Sans",Arial,sans-serif;
}
summary::-webkit-details-marker{display:none}
summary:after{
  content:"+";
  position:absolute;right:0;top:-3px;
  color:var(--muted);font-size:21px;font-weight:400;
}
details[open] summary:after{content:"−"}
details p{
  margin:12px 0 0;
  color:#5a5f5b;
  font-size:16px;
  line-height:1.65;
}
.editorial-disclosure{
  margin-top:66px;
  padding-top:24px;
  border-top:1px solid var(--line);
}
.editorial-disclosure h2{font-size:20px;margin:0 0 10px}
.editorial-disclosure p{font-size:14px;line-height:1.65;color:var(--muted)}

.sidebar{
  position:sticky;
  top:30px;
  font-family:"DM Sans",Arial,sans-serif;
  font-size:13px;
}
.side-block{padding:20px 0;border-top:1px solid var(--line)}
.side-block:last-child{border-bottom:1px solid var(--line)}
.side-label{
  margin:0 0 12px;
  font:700 10px/1.2 "DM Sans",Arial,sans-serif;
  letter-spacing:.14em;
  color:var(--muted);
}
.toc{display:flex;flex-direction:column}
.toc a{
  padding:7px 0;
  text-decoration:none;
  color:#5e635f;
  line-height:1.35;
}
.toc a:hover{color:var(--ink)}
.side-note p:last-child{margin:0;color:#686d69;line-height:1.55}

.site-footer{border-top:1px solid var(--line)}
.footer-inner{
  max-width:var(--max);margin:auto;padding:24px 28px;
  display:flex;justify-content:space-between;gap:20px;
  font:500 11px/1.4 "DM Sans",Arial,sans-serif;
  color:var(--muted);
  letter-spacing:.02em;
}

@media (max-width:1000px){
  .article-layout{grid-template-columns:minmax(0,760px)}
  .sidebar{display:none}
}
@media (max-width:640px){
  body{font-size:17px;line-height:1.7}
  .header-inner{min-height:62px;padding:0 18px}
  .site-header nav{gap:14px;font-size:12px}
  .site-header nav a:nth-child(2){display:none}
  .page-shell{padding:34px 18px 60px}
  h1{font-size:39px}
  .dek{font-size:19px}
  .hero-figure{min-height:240px}
  .article-body h2{font-size:28px;margin-top:48px}
  .summary-list>div{grid-template-columns:1fr;gap:5px}
  table{font-size:14px}
  th,td{padding:10px}
  .button-link{margin:10px 0 0;display:block;width:max-content}
  .footer-inner{padding:20px 18px;flex-direction:column}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}