:root {
  --ink: #10213d;
  --muted: #526077;
  --navy: #071f46;
  --blue: #155de8;
  --cyan: #45c6ed;
  --yellow: #ffc838;
  --coral: #ff6b5f;
  --paper: #f6f8fc;
  --white: #ffffff;
  --line: #dce4f0;
  --shadow: 0 18px 50px rgba(7, 31, 70, .12);
  --radius: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 17px; line-height: 1.72; }
img { max-width: 100%; display: block; }
a { color: inherit; }
.skip-link { position: absolute; left: -999px; top: .5rem; z-index: 99; background: var(--white); padding: .7rem 1rem; border-radius: 10px; }
.skip-link:focus { left: .5rem; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(246,248,252,.94); backdrop-filter: blur(14px); border-bottom: 1px solid rgba(16,33,61,.08); }
.nav { max-width: 1180px; margin: auto; padding: .85rem 1.25rem; display: flex; align-items: center; gap: 1.2rem; }
.brand { display: inline-flex; align-items: center; gap: .7rem; text-decoration: none; font-weight: 900; letter-spacing: -.04em; font-size: 1.2rem; white-space: nowrap; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 11px; color: var(--navy); background: var(--yellow); box-shadow: inset 0 -3px 0 rgba(7,31,70,.12); }
.brand-mark::before { content: "+"; font-size: 1.45rem; line-height: 1; }
.nav-links { margin-left: auto; display: flex; gap: .2rem; align-items: center; }
.nav-links a { text-decoration: none; padding: .55rem .72rem; border-radius: 10px; color: var(--muted); font-size: .88rem; font-weight: 750; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--navy); background: var(--white); }
.menu-button { display: none; margin-left: auto; border: 1px solid var(--line); background: var(--white); color: var(--navy); border-radius: 10px; padding: .55rem .75rem; font: inherit; font-weight: 800; }
.container { width: min(1180px, calc(100% - 2.5rem)); margin-inline: auto; }
.hero { color: white; background: var(--navy); overflow: hidden; }
.hero-grid { position: relative; min-height: 690px; display: flex; align-items: center; isolation: isolate; }
.hero-grid > div:first-child { position: relative; z-index: 2; width: min(54%, 650px); padding-block: 3rem; }
.eyebrow { display: inline-flex; align-items: center; gap: .55rem; text-transform: uppercase; letter-spacing: .14em; font-size: .73rem; font-weight: 900; color: var(--blue); }
.hero .eyebrow { color: var(--cyan); }
.eyebrow::before { content: ""; width: 1.9rem; height: 3px; border-radius: 3px; background: currentColor; }
h1, h2, h3 { line-height: 1.08; letter-spacing: -.045em; margin: 0 0 .75rem; text-wrap: balance; }
h1 { font-size: clamp(3rem, 6vw, 5.9rem); max-width: 780px; }
h2 { font-size: clamp(2rem, 4vw, 3.45rem); }
h3 { font-size: 1.45rem; }
.hero p { color: #cfdbec; max-width: 650px; font-size: 1.14rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.7rem; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 48px; padding: .65rem 1.05rem; border-radius: 13px; font-weight: 850; text-decoration: none; border: 1px solid transparent; }
.button-primary { background: var(--yellow); color: var(--navy); box-shadow: 0 8px 25px rgba(255,200,56,.2); }
.button-secondary { color: white; border-color: rgba(255,255,255,.25); }
.hero-visual { position: absolute; inset: 0; z-index: 0; }
.hero-visual img { width: 100%; height: 100%; object-fit: contain; object-position: center; }
.hero-visual::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 63%; z-index: 1; background: linear-gradient(90deg, var(--navy) 0 38%, rgba(7,31,70,.86) 54%, transparent 100%); }
.quick-strip { margin-top: -44px; position: relative; z-index: 5; display: grid; grid-template-columns: repeat(4, 1fr); background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.quick-strip a { padding: 1.2rem 1.35rem; text-decoration: none; border-right: 1px solid var(--line); }
.quick-strip a:last-child { border: 0; }
.quick-strip strong, .quick-strip span { display: block; }
.quick-strip strong { color: var(--navy); }
.quick-strip span { color: var(--muted); font-size: .85rem; line-height: 1.35; }
.section { padding: 6rem 0; }
.section-tight { padding: 4rem 0; }
.section-dark { background: var(--navy); color: white; }
.section-blue { background: #eaf1ff; }
.section-head { display: grid; grid-template-columns: .8fr 1.2fr; gap: 3rem; align-items: end; margin-bottom: 2.5rem; }
.section-head p { margin: 0; color: var(--muted); }
.section-dark .section-head p { color: #cbd7e8; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.card { background: var(--white); border: 1px solid var(--line); border-radius: 20px; padding: 1.5rem; box-shadow: 0 5px 22px rgba(7,31,70,.06); }
.card p { color: var(--muted); margin-bottom: 0; }
.card .number { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 13px; margin-bottom: 1rem; background: var(--yellow); color: var(--navy); font-weight: 950; }
.battery-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: .75rem; align-items: stretch; }
.battery-chip { position: relative; min-height: 220px; padding: 1rem; border-radius: 18px; background: var(--white); border: 1px solid var(--line); overflow: hidden; }
.battery-chip h3 { font-size: 1.15rem; letter-spacing: -.02em; }
.battery-chip p { font-size: .87rem; line-height: 1.45; color: var(--muted); }
.battery-shape { margin: 1.1rem auto; width: var(--w); height: var(--h); max-height: 88px; border-radius: calc(var(--w) / 2); background: linear-gradient(90deg, var(--blue) 0 72%, var(--yellow) 72%); box-shadow: inset -4px 0 rgba(255,255,255,.35); position: relative; }
.battery-shape::after { content: ""; position: absolute; right: -5px; top: 38%; width: 7px; height: 24%; border-radius: 0 3px 3px 0; background: #a6b1c3; }
.fact-band { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.fact { border-top: 3px solid var(--yellow); padding-top: 1rem; }
.fact strong { display: block; font-size: 2.6rem; line-height: 1; letter-spacing: -.05em; }
.fact span { color: #cbd7e8; }
.article-hero { padding: 5.5rem 0 4rem; background: var(--navy); color: white; }
.article-hero p { color: #cbd7e8; max-width: 760px; font-size: 1.12rem; }
.breadcrumb { font-size: .85rem; color: #9eb1cd; margin-bottom: 2rem; }
.breadcrumb a { color: white; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 4rem; align-items: start; }
.prose { max-width: 790px; }
.prose > p:first-of-type { font-size: 1.25rem; color: #33435d; }
.prose h2 { margin-top: 3.8rem; padding-top: 1rem; }
.prose h3 { margin-top: 2.2rem; letter-spacing: -.025em; }
.prose p, .prose li { color: #33435d; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin-bottom: .55rem; }
.shop-link-wrap { margin: 1.15rem 0 2.2rem; }
.shop-link { display: inline-flex; align-items: center; gap: .45rem; color: var(--blue); font-weight: 850; text-underline-offset: .22em; text-decoration-thickness: 2px; }
.shop-link:hover { color: var(--navy); }
.shop-link:focus-visible { outline: 3px solid var(--yellow); outline-offset: 4px; border-radius: 4px; }
.callout { margin: 2rem 0; padding: 1.4rem 1.5rem; border-radius: 18px; background: #eaf1ff; border-left: 5px solid var(--blue); }
.callout.warning { background: #fff4d5; border-color: #d99700; }
.callout.danger { background: #fff0ee; border-color: var(--coral); }
.callout strong { display: block; color: var(--navy); margin-bottom: .2rem; }
.toc { position: sticky; top: 92px; background: white; padding: 1.25rem; border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 8px 30px rgba(7,31,70,.07); }
.toc strong { display: block; margin-bottom: .7rem; }
.toc a { display: block; padding: .38rem 0; text-decoration: none; color: var(--muted); font-size: .9rem; line-height: 1.35; }
.toc a:hover { color: var(--blue); }
.spec-table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: .94rem; background: white; }
.spec-table th, .spec-table td { padding: .85rem; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.spec-table th { background: var(--navy); color: white; }
.source-list { padding: 1.5rem; border-radius: 18px; background: white; border: 1px solid var(--line); }
.source-list a { color: var(--blue); }
.next-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.next-card { text-decoration: none; padding: 1.6rem; min-height: 180px; border-radius: 20px; background: var(--navy); color: white; display: flex; flex-direction: column; justify-content: flex-end; }
.next-card span { color: var(--cyan); font-weight: 800; }
.site-footer { background: #04152f; color: #aabbd2; padding: 3rem 0; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 2rem; }
.site-footer a { color: white; }
.mini-note { font-size: .82rem; color: var(--muted); }
@media (max-width: 900px) {
  .menu-button { display: inline-flex; }
  .nav-links { display: none; position: absolute; left: 1rem; right: 1rem; top: 68px; padding: .75rem; background: white; box-shadow: var(--shadow); border-radius: 16px; flex-direction: column; align-items: stretch; }
  .nav-links.open { display: flex; }
  .hero-grid { min-height: 0; flex-direction: column; align-items: stretch; padding-top: 4rem; }
  .hero-grid > div:first-child { width: 100%; padding-block: 0 1.5rem; }
  .hero-visual { position: relative; inset: auto; width: 100%; min-height: 0; aspect-ratio: 1672 / 941; }
  .hero-visual img { object-fit: contain; object-position: center; }
  .hero-visual::before { display: none; }
  .quick-strip { grid-template-columns: repeat(2, 1fr); }
  .section-head, .article-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .toc { position: static; order: -1; }
  .cards, .fact-band { grid-template-columns: 1fr; }
  .battery-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .container { width: min(100% - 1.5rem, 1180px); }
  h1 { font-size: clamp(2.65rem, 13vw, 4rem); }
  .hero-grid { min-height: 0; }
  .hero-visual { min-height: 0; }
  .quick-strip { margin-top: -25px; grid-template-columns: 1fr; }
  .quick-strip a { border-right: 0; border-bottom: 1px solid var(--line); }
  .battery-grid { grid-template-columns: repeat(2, 1fr); }
  .section { padding: 4.5rem 0; }
  .next-grid, .footer-grid { grid-template-columns: 1fr; }
  .spec-table { font-size: .82rem; }
  .spec-table th, .spec-table td { padding: .55rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }