:root {
  --bg: #090d10;
  --bg-2: #10161a;
  --panel: rgba(255, 255, 255, 0.065);
  --panel-strong: rgba(255, 255, 255, 0.1);
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.2);
  --text: #f4f7f8;
  --muted: rgba(244, 247, 248, 0.68);
  --soft: rgba(244, 247, 248, 0.48);
  --cyan: #56dce7;
  --cyan-2: #00a7b5;
  --amber: #f6c463;
  --orange: #ff8a24;
  --steel: #8da1aa;
  --dark-text: #101417;
  --radius: 8px;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.38);
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 78% 10%, rgba(246, 196, 99, 0.08), transparent 28%),
    radial-gradient(circle at 8% 6%, rgba(86, 220, 231, 0.035), transparent 30%),
    linear-gradient(135deg, #050708 0%, #0a0e10 54%, #07090b 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg width='180' height='180' viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.72' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.45'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(180px, 1fr);
  align-items: center;
  gap: 24px;
  min-height: 74px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(8, 12, 14, 0.64);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px) saturate(1.12);
  transition: min-height 220ms ease, background 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.site-header.is-scrolled {
  min-height: 66px;
  background: rgba(8, 12, 14, 0.88);
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.28);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  color: #101417;
  background: linear-gradient(135deg, #ffe09a, #f6c463 48%, #ff8a24);
  border-radius: var(--radius);
  box-shadow: 0 12px 30px rgba(246, 196, 99, 0.18);
  font-weight: 950;
}

.brand strong,
.brand small {
  display: block;
  white-space: nowrap;
}

.brand strong {
  font-size: 15px;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  color: rgba(244, 247, 248, 0.75);
  font-size: 14px;
  font-weight: 760;
}

.nav-links > a,
.nav-item > a {
  display: inline-flex;
  padding: 14px 0;
}

.nav-links a:hover {
  color: #fff;
}

.nav-item {
  position: relative;
}

.mega-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 8px;
  width: min(560px, 86vw);
  padding: 14px;
  background: rgba(12, 18, 21, 0.94);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) translateY(8px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.has-mega:hover .mega-menu,
.has-mega:focus-within .mega-menu {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.mega-menu a {
  display: grid;
  gap: 4px;
  padding: 13px;
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid transparent;
  border-radius: var(--radius);
}

.mega-menu a:hover {
  border-color: rgba(86, 220, 231, 0.32);
  background: rgba(86, 220, 231, 0.08);
}

.mega-menu span {
  color: var(--amber);
  font-size: 11px;
  font-weight: 900;
  text-transform: uppercase;
}

.mega-menu strong {
  font-size: 14px;
}

.header-action,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 900;
  cursor: pointer;
}

.header-action {
  justify-self: end;
  color: var(--dark-text);
  background: var(--amber);
  box-shadow: 0 14px 30px rgba(246, 196, 99, 0.12);
}

.button.primary {
  color: var(--dark-text);
  background: linear-gradient(135deg, #ffe0a0, var(--amber));
  box-shadow: 0 18px 40px rgba(246, 196, 99, 0.16);
}

.button.secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--line-strong);
}

.header-action,
.button {
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.header-action:hover,
.button.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 42px rgba(246, 196, 99, 0.24);
}

.button.secondary:hover {
  transform: translateY(-1px);
  border-color: rgba(246, 196, 99, 0.46);
  background: rgba(246, 196, 99, 0.08);
}

.button.on-light {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.mobile-menu-button {
  display: none;
}

.mobile-panel {
  position: fixed;
  inset: 74px 12px auto;
  z-index: 39;
  display: none;
  gap: 4px;
  padding: 14px;
  background: rgba(8, 12, 14, 0.96);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-height: calc(100svh - 86px);
  overflow-y: auto;
}

.mobile-panel[hidden] {
  display: none;
}

.mobile-panel a {
  padding: 12px;
  color: var(--muted);
  border-radius: var(--radius);
}

.mobile-panel a:hover,
.mobile-panel .mobile-quote {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(460px, 0.98fr) minmax(520px, 1.02fr);
  grid-template-rows: minmax(0, 1fr) auto;
  column-gap: clamp(18px, 3.8vw, 72px);
  align-items: center;
  min-height: 100svh;
  padding: clamp(116px, 9vw, 152px) clamp(22px, 5vw, 88px) clamp(32px, 4vw, 56px);
  overflow: hidden;
  background:
    radial-gradient(circle at 83% 19%, rgba(246, 196, 99, 0.18), transparent 28%),
    radial-gradient(circle at 63% 46%, rgba(246, 196, 99, 0.09), transparent 30%),
    radial-gradient(circle at 7% 16%, rgba(86, 220, 231, 0.04), transparent 28%),
    linear-gradient(120deg, #050708 0%, #070a0c 46%, #0b1012 100%);
  isolation: isolate;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}

.hero::before {
  inset: 0;
  z-index: -2;
  opacity: 0.1;
  background-image: url("data:image/svg+xml,%3Csvg width='180' height='180' viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.7' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.38'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
}

.hero::after {
  left: 0;
  right: 0;
  bottom: clamp(102px, 11vw, 136px);
  z-index: -1;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.13), transparent);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  animation: heroReveal 780ms ease both;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--amber);
  font-size: 12px;
  font-weight: 950;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(62px, 5vw, 94px);
  font-weight: 620;
  letter-spacing: 0;
  line-height: 0.94;
  text-wrap: balance;
}

.hero h1 span {
  display: block;
  white-space: nowrap;
}

.page-hero h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(46px, 6.3vw, 92px);
  line-height: 0.96;
}

.hero-copy,
.page-hero p,
.section-head p,
.oem-section p,
.narrative-section > p {
  color: var(--muted);
  font-size: clamp(16px, 1.45vw, 20px);
  line-height: 1.66;
}

.hero-copy {
  max-width: 610px;
  margin: 30px 0 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.hero-product-composition {
  position: relative;
  z-index: 1;
  justify-self: end;
  width: min(57vw, 1080px);
  max-width: none;
  margin: 0;
  --glow-x: 52%;
  --glow-y: 42%;
  --tilt-x: 0deg;
  --tilt-y: 0deg;
  --hero-shift-x: 4%;
  transform: perspective(1500px) rotateX(var(--tilt-x)) rotateY(var(--tilt-y)) translate3d(var(--hero-shift-x), 0, 0);
  transition: transform 220ms ease-out;
  animation: productReveal 1000ms 120ms ease both, productFloat 7s 1.2s ease-in-out infinite;
}

.hero-product-composition::before {
  content: "";
  position: absolute;
  inset: 7% -5% 4% 7%;
  z-index: -1;
  background:
    radial-gradient(ellipse at 68% 24%, rgba(246, 196, 99, 0.28), transparent 42%),
    radial-gradient(ellipse at 38% 55%, rgba(246, 196, 99, 0.12), rgba(86, 220, 231, 0.035) 44%, transparent 72%);
  filter: blur(30px);
  opacity: 0.68;
}

.hero-product-composition::after {
  content: "";
  position: absolute;
  inset: -1px;
  pointer-events: none;
  background:
    linear-gradient(90deg, #050708 0%, rgba(5, 7, 8, 0.88) 5%, rgba(5, 7, 8, 0.28) 19%, transparent 45%, rgba(5, 7, 8, 0.08) 82%, rgba(5, 7, 8, 0.5) 100%),
    linear-gradient(180deg, rgba(5, 7, 8, 0.34) 0%, transparent 14%, transparent 76%, #050708 99%),
    radial-gradient(circle at 82% 12%, rgba(246, 196, 99, 0.16), transparent 22%);
}

.hero-product-composition img {
  display: block;
  width: 100%;
  height: auto;
  filter: saturate(0.9) contrast(1.03) drop-shadow(0 44px 76px rgba(0, 0, 0, 0.54));
}

.hero-product-nav {
  position: relative;
  z-index: 3;
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-top: clamp(26px, 3.8vw, 54px);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  animation: heroReveal 780ms 220ms ease both;
}

.hero-product-nav a {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 58px auto;
  align-items: center;
  gap: clamp(12px, 1.4vw, 20px);
  min-height: 92px;
  padding: 14px clamp(14px, 2.2vw, 26px) 14px 0;
  color: rgba(244, 247, 248, 0.64);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
  transition: color 180ms ease, background 180ms ease;
}

.hero-product-nav a:last-child {
  border-right: 0;
}

.hero-product-nav a::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 70px;
  height: 1px;
  background: var(--amber);
  opacity: 0;
  transform: scaleX(0.5);
  transform-origin: left;
  transition: opacity 180ms ease, transform 180ms ease;
}

.product-nav-index {
  color: rgba(246, 196, 99, 0.82);
  font-size: clamp(28px, 2.7vw, 38px);
  font-weight: 760;
  line-height: 1;
}

.product-nav-copy {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.product-nav-copy strong {
  color: rgba(244, 247, 248, 0.88);
  font-size: 14px;
  font-weight: 850;
  letter-spacing: 0;
}

.product-nav-copy small {
  color: rgba(244, 247, 248, 0.46);
  font-size: 12px;
}

.product-nav-thumb {
  width: 58px;
  height: 42px;
  object-fit: cover;
  opacity: 0.72;
  filter: saturate(0.82) contrast(1.05);
  transform: translateX(0);
  transition: opacity 180ms ease, transform 180ms ease;
}

.hero-product-nav a[data-category="battery"] .product-nav-thumb {
  object-position: 72% 54%;
}

.hero-product-nav a[data-category="motor"] .product-nav-thumb {
  object-position: 22% 60%;
}

.hero-product-nav a[data-category="esc"] .product-nav-thumb {
  object-position: 74% 78%;
}

.hero-product-nav a[data-category="propeller"] .product-nav-thumb {
  object-position: 43% 18%;
}

.product-nav-arrow {
  color: rgba(244, 247, 248, 0.72);
  font-size: 24px;
  line-height: 1;
  transition: color 180ms ease, transform 180ms ease;
}

.hero-product-nav a:hover {
  color: #fff;
  background: rgba(246, 196, 99, 0.025);
}

.hero-product-nav a:hover::before {
  opacity: 1;
  transform: scaleX(1);
}

.hero-product-nav a:hover .product-nav-thumb {
  opacity: 0.96;
  transform: translateX(4px);
}

.hero-product-nav a:hover .product-nav-arrow {
  color: var(--amber);
  transform: translateX(3px);
}

.section {
  padding: clamp(70px, 8vw, 112px) clamp(18px, 5vw, 72px);
}

.section-head {
  max-width: var(--container);
  margin: 0 auto 34px;
}

.section-head.compact {
  margin-bottom: 22px;
}

.section h2,
.final-cta h2 {
  margin: 0;
  font-size: clamp(32px, 4.2vw, 58px);
  line-height: 1.02;
}

.category-grid,
.featured-grid,
.application-grid,
.advantage-grid,
.contact-grid,
.product-info-grid {
  display: grid;
  max-width: var(--container);
  margin: 0 auto;
  gap: 16px;
}

.category-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.category-card,
.featured-card,
.application-card,
.advantage-grid article,
.contact-grid article,
.product-info-grid article {
  position: relative;
  overflow: hidden;
  min-height: 260px;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
}

.category-card:hover,
.featured-card:hover,
.application-card:hover {
  border-color: rgba(246, 196, 99, 0.42);
  transform: translateY(-2px);
  transition: transform 180ms ease, border-color 180ms ease;
}

.category-card h3,
.featured-card h3,
.application-card h3,
.advantage-grid h3,
.contact-grid h2,
.product-info-grid h2 {
  margin: 18px 0 10px;
  font-size: 24px;
}

.category-card p,
.featured-card p,
.application-card p,
.advantage-grid p,
.contact-grid p,
.product-info-grid p,
.product-info-grid li {
  color: var(--muted);
  line-height: 1.62;
}

.category-grid-core {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.category-card-media,
.featured-product-media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: #f3f1ec;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.category-card-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 46%, rgba(5, 7, 8, 0.82));
}

.category-card-media img,
.featured-product-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 300ms ease, filter 300ms ease;
}

.category-card-media span {
  position: absolute;
  z-index: 1;
  left: 16px;
  bottom: 14px;
  color: #fff;
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.category-card:hover .category-card-media img,
.featured-card:hover .featured-product-media img {
  transform: scale(1.035);
  filter: contrast(1.04) saturate(1.03);
}

.text-link,
.card-actions a {
  display: inline-flex;
  margin-top: 18px;
  color: var(--amber);
  font-weight: 900;
}

.featured-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.section-head-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 36px;
}

.section-head-row > div {
  max-width: 820px;
}

.section-link {
  flex: 0 0 auto;
  padding-bottom: 8px;
  color: var(--amber);
  border-bottom: 1px solid rgba(246, 196, 99, 0.42);
  font-size: 13px;
  font-weight: 900;
}

.featured-product-media {
  aspect-ratio: 1 / 1;
}

.battery-catalog-section {
  background:
    radial-gradient(circle at 84% 10%, rgba(246, 196, 99, 0.12), transparent 24%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.018));
}

.battery-catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  max-width: var(--container);
  margin: 0 auto;
}

.battery-card {
  overflow: hidden;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.battery-card:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(246, 196, 99, 0.42);
}

.battery-card-media {
  display: block;
  aspect-ratio: 4 / 3;
  background: #f4f3ef;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.battery-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 220ms ease, filter 220ms ease;
}

.battery-card:hover .battery-card-media img {
  transform: scale(1.025);
  filter: contrast(1.04) saturate(1.03);
}

.battery-card-body {
  display: grid;
  gap: 16px;
  padding: 20px;
}

.battery-card h3 {
  margin: 0;
  min-height: 58px;
  color: rgba(255, 255, 255, 0.94);
  font-size: clamp(20px, 1.7vw, 25px);
  line-height: 1.16;
}

.battery-specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.battery-specs div {
  display: grid;
  gap: 4px;
  min-width: 0;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.battery-specs div:nth-child(odd) {
  padding-right: 12px;
}

.battery-specs div:nth-child(even) {
  padding-left: 12px;
}

.battery-specs dt {
  color: rgba(255, 255, 255, 0.43);
  font-size: 11px;
  font-weight: 760;
  text-transform: uppercase;
}

.battery-specs dd {
  margin: 0;
  color: #fff;
  font-size: 13px;
  font-weight: 820;
}

.battery-gallery {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
}

.battery-gallery img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  opacity: 0.78;
  transition: opacity 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.battery-gallery img:hover {
  opacity: 1;
  border-color: rgba(246, 196, 99, 0.5);
  transform: translateY(-1px);
}

.battery-detail-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(380px, 0.92fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: center;
  min-height: 760px;
  padding: clamp(128px, 13vw, 172px) max(24px, calc((100vw - var(--container)) / 2)) clamp(72px, 8vw, 112px);
  background:
    radial-gradient(circle at 20% 28%, rgba(246, 196, 99, 0.1), transparent 28%),
    linear-gradient(135deg, #070a0b, #0b1012 56%, #080b0c);
}

.battery-detail-gallery {
  min-width: 0;
}

.battery-detail-main {
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: #f3f1ec;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius);
}

.battery-detail-main img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.battery-detail-thumbs {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  margin-top: 10px;
}

.battery-detail-thumbs button {
  overflow: hidden;
  padding: 0;
  aspect-ratio: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 6px;
  cursor: pointer;
  opacity: 0.65;
  transition: opacity 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.battery-detail-thumbs button:hover,
.battery-detail-thumbs button.is-active {
  opacity: 1;
  border-color: rgba(246, 196, 99, 0.72);
  transform: translateY(-1px);
}

.battery-detail-thumbs img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detail-back-link {
  display: inline-flex;
  margin-bottom: 34px;
  color: var(--soft);
  font-size: 13px;
  font-weight: 760;
}

.battery-detail-copy h1 {
  max-width: 720px;
  margin: 16px 0 22px;
  color: #fff;
  font-size: clamp(42px, 5.4vw, 78px);
  font-weight: 620;
  line-height: 0.98;
  letter-spacing: 0;
}

.battery-detail-intro {
  max-width: 650px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.68;
}

.battery-detail-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 28px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.battery-detail-summary div {
  padding: 14px 12px 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.battery-detail-summary dt {
  color: var(--soft);
  font-size: 11px;
  font-weight: 760;
  text-transform: uppercase;
}

.battery-detail-summary dd {
  margin: 5px 0 0;
  color: #fff;
  font-size: 15px;
  font-weight: 760;
}

.detail-contact-line {
  color: var(--soft);
  font-size: 13px;
}

.detail-contact-line a {
  color: var(--amber);
}

.battery-model-specs {
  max-width: var(--container);
  margin: 0 auto;
}

.battery-detail-next {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(320px, 1fr) auto;
  gap: clamp(24px, 4vw, 64px);
  align-items: center;
  max-width: var(--container);
  margin: 0 auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.battery-detail-next h2 {
  margin: 12px 0 0;
  font-size: clamp(30px, 3vw, 46px);
  line-height: 1.08;
}

.battery-detail-next > p {
  color: var(--muted);
  line-height: 1.65;
}

.featured-card dl {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
}

.featured-card dl div,
.spec-table tr {
  display: grid;
  grid-template-columns: minmax(120px, 0.7fr) minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.featured-card dt,
.spec-table th {
  color: var(--soft);
  font-size: 12px;
  text-align: left;
}

.featured-card dd,
.spec-table td {
  margin: 0;
  color: #fff;
  font-size: 13px;
  font-weight: 760;
}

.card-kicker {
  margin: 18px 0 -8px;
  color: var(--amber) !important;
  font-size: 12px;
  font-weight: 950;
  text-transform: uppercase;
}

.card-actions {
  display: flex;
  gap: 14px;
}

.applications-section,
.product-band {
  background: rgba(255, 255, 255, 0.025);
}

.application-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.application-card span,
.advantage-grid strong {
  color: var(--amber);
  font-size: 13px;
  font-weight: 950;
}

.why-section {
  background: linear-gradient(180deg, rgba(86, 220, 231, 0.05), rgba(255, 255, 255, 0.02));
}

.advantage-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.oem-section {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  max-width: calc(var(--container) + 144px);
  margin: 0 auto;
}

.custom-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.custom-list span {
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: rgba(255, 255, 255, 0.82);
  font-weight: 760;
}

.final-cta,
.page-hero {
  margin: 0 auto;
  padding: clamp(112px, 14vw, 174px) clamp(18px, 5vw, 72px) clamp(70px, 8vw, 104px);
  background:
    radial-gradient(circle at 70% 26%, rgba(86, 220, 231, 0.18), transparent 28%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0.015));
}

.page-hero {
  padding-top: clamp(130px, 14vw, 180px);
}

.page-hero > *,
.final-cta > * {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}

.final-cta {
  text-align: center;
}

.final-cta p:not(.eyebrow) {
  max-width: 740px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.66;
}

.final-cta .hero-actions {
  justify-content: center;
}

.detail-layout {
  display: grid;
  grid-template-columns: minmax(340px, 0.9fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  max-width: calc(var(--container) + 144px);
  margin: 0 auto;
}

.detail-visual .category-card-media {
  min-height: 460px;
  aspect-ratio: 4 / 3;
}

.detail-copy h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 58px);
  line-height: 1.05;
}

.detail-copy p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.66;
}

.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.specs-section {
  max-width: var(--container);
  margin: 0 auto;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.spec-table tbody,
.spec-table tr {
  display: block;
}

.product-info-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.inquiry-section {
  max-width: var(--container);
  margin: 0 auto;
}

.inquiry-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: clamp(22px, 4vw, 34px);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.inquiry-form label {
  display: grid;
  gap: 8px;
}

.inquiry-form span {
  color: rgba(255, 255, 255, 0.76);
  font-size: 13px;
  font-weight: 760;
}

.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  min-height: 46px;
  padding: 12px 13px;
  color: #fff;
  background: rgba(0, 0, 0, 0.18);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  outline: none;
}

.inquiry-form textarea {
  min-height: 132px;
  resize: vertical;
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  border-color: rgba(86, 220, 231, 0.62);
  box-shadow: 0 0 0 3px rgba(86, 220, 231, 0.12);
}

.inquiry-form .wide,
.form-note {
  grid-column: 1 / -1;
}

.form-note {
  margin: 0;
  color: var(--soft);
  font-size: 13px;
}

.contact-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.narrative-section {
  max-width: var(--container);
  margin: 0 auto;
}

.site-footer {
  padding: 58px clamp(18px, 5vw, 72px) 28px;
  background: #070a0c;
  border-top: 1px solid var(--line);
}

.footer-brand,
.footer-grid,
.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
}

.footer-brand {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 34px;
}

.footer-brand p {
  max-width: 420px;
  color: var(--muted);
  line-height: 1.58;
}

.footer-grid {
  display: grid;
  grid-template-columns: 0.7fr 1fr 1fr 1fr;
  gap: 24px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.footer-grid div {
  display: grid;
  align-content: start;
  gap: 10px;
}

.footer-grid h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.footer-grid a,
.footer-grid span {
  color: var(--soft);
  font-size: 14px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding-top: 22px;
  color: rgba(255, 255, 255, 0.38);
  font-size: 13px;
}

@keyframes heroReveal {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes productReveal {
  from {
    opacity: 0;
    transform: perspective(1500px) rotateX(1deg) rotateY(-1deg) translate3d(var(--hero-shift-x), 24px, 0);
  }
  to {
    opacity: 1;
    transform: perspective(1500px) rotateX(var(--tilt-x)) rotateY(var(--tilt-y)) translate3d(var(--hero-shift-x), 0, 0);
  }
}

@keyframes productFloat {
  0%,
  100% {
    translate: 0 0;
  }
  50% {
    translate: 0 -8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}

@media (max-width: 1120px) {
  .site-header {
    grid-template-columns: 1fr auto auto;
  }

  .nav-links,
  .header-action {
    display: none;
  }

  .mobile-menu-button {
    display: grid;
    gap: 5px;
    width: 44px;
    height: 44px;
    place-content: center;
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .mobile-menu-button span {
    display: block;
    width: 18px;
    height: 2px;
    background: #fff;
  }

  .mobile-panel:not([hidden]) {
    display: grid;
  }

  .hero {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    min-height: auto;
    padding-top: clamp(104px, 13vw, 132px);
    row-gap: clamp(28px, 7vw, 54px);
  }

  .hero-content {
    order: 1;
    max-width: 820px;
  }

  .hero-product-composition {
    order: 2;
    justify-self: center;
    width: min(100%, 860px);
    --hero-shift-x: 0%;
  }

  .hero-product-composition::after {
    background:
      linear-gradient(180deg, rgba(5, 7, 8, 0.16) 0%, transparent 20%, transparent 72%, #050708 100%),
      radial-gradient(circle at 82% 12%, rgba(246, 196, 99, 0.12), transparent 22%);
  }

  .hero-product-nav {
    order: 3;
    grid-column: auto;
    grid-template-columns: 1fr 1fr;
    margin: 0;
  }

  .hero-product-nav a:nth-child(2n) {
    border-right: 0;
  }

  .category-grid,
  .featured-grid,
  .application-grid,
  .advantage-grid,
  .battery-catalog-grid,
  .product-info-grid,
  .contact-grid,
  .oem-section,
  .detail-layout,
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .battery-detail-hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .battery-detail-next {
    grid-template-columns: 1fr 1fr;
  }

  .battery-detail-next .button {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .section-head-row {
    align-items: start;
    flex-direction: column;
    gap: 18px;
  }
}

@media (max-width: 640px) {
  .site-header {
    min-height: 66px;
    padding: 11px 14px;
  }

  .brand small {
    display: none;
  }

  .hero {
    padding: 102px 14px 46px;
    gap: 26px;
  }

  .hero h1 {
    font-size: clamp(44px, 12.4vw, 62px);
    line-height: 0.98;
  }

  .hero h1 span {
    white-space: normal;
  }

  .page-hero h1 {
    font-size: clamp(40px, 12vw, 56px);
    line-height: 1.04;
  }

  .hero-actions,
  .detail-actions {
    display: grid;
  }

  .category-grid,
  .featured-grid,
  .application-grid,
  .advantage-grid,
  .battery-catalog-grid,
  .product-info-grid,
  .contact-grid,
  .oem-section,
  .detail-layout,
  .footer-grid,
  .custom-list,
  .inquiry-form {
    grid-template-columns: 1fr;
  }

  .category-grid-core {
    grid-template-columns: 1fr;
  }

  .hero-product-nav {
    grid-template-columns: 1fr 1fr;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .hero-product-nav a {
    grid-template-columns: auto minmax(0, 1fr) auto;
    min-height: 78px;
    padding: 12px 12px 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .product-nav-thumb {
    display: none;
  }

  .product-nav-index {
    font-size: 26px;
  }

  .product-nav-copy strong {
    font-size: 12px;
  }

  .product-nav-arrow {
    font-size: 20px;
  }

  .hero-product-nav a:nth-child(2n) {
    border-right: 0;
  }

  .section,
  .page-hero,
  .final-cta {
    padding-left: 14px;
    padding-right: 14px;
  }

  .featured-card dl div,
  .spec-table tr {
    grid-template-columns: 1fr;
    gap: 3px;
  }

  .battery-card h3 {
    min-height: auto;
  }

  .battery-gallery {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .battery-detail-hero {
    gap: 30px;
    padding: 104px 14px 54px;
  }

  .battery-detail-copy h1 {
    font-size: clamp(38px, 11vw, 54px);
    letter-spacing: 0;
  }

  .detail-back-link {
    margin-bottom: 24px;
  }

  .battery-detail-thumbs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .battery-detail-summary,
  .battery-detail-next {
    grid-template-columns: 1fr;
  }

  .battery-detail-next .button {
    grid-column: auto;
  }

  .footer-brand,
  .footer-bottom {
    display: grid;
  }
}