:root {
  color-scheme: dark;
  --bg: #080b10;
  --panel: rgba(18, 24, 31, .82);
  --panel-strong: #111922;
  --line: rgba(255, 255, 255, .12);
  --text: #eef4f7;
  --muted: #9aa9b2;
  --cyan: #32d4e8;
  --green: #7ee787;
  --amber: #f5b942;
  --steel: #b7c4d6;
  --red: #ff6b6b;
  --shadow: 0 24px 70px rgba(0, 0, 0, .35);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(50, 212, 232, .18), transparent 28rem),
    radial-gradient(circle at 88% 18%, rgba(245, 185, 66, .12), transparent 24rem),
    linear-gradient(135deg, #080b10 0%, #10151a 46%, #0b0f12 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.75), transparent 70%);
}

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

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
  background: rgba(8, 11, 16, .76);
  backdrop-filter: blur(18px);
}

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

.brand-logo {
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  border-radius: 8px;
  object-fit: contain;
  box-shadow: 0 0 32px rgba(50, 212, 232, .18);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 16px;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 3vw, 30px);
  color: #cbd6dc;
  font-size: 14px;
}

.top-nav a {
  transition: color .2s ease;
}

.top-nav a:hover {
  color: var(--cyan);
}

.hero,
.section,
.contact-band,
.site-footer,
.product-hero,
.product-detail {
  width: min(1180px, calc(100% - 36px));
  margin-inline: auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: clamp(28px, 6vw, 78px);
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: 52px 0 84px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(38px, 6vw, 76px);
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.16;
}

h3 {
  margin-bottom: 12px;
  font-size: 21px;
  line-height: 1.35;
}

.hero-text,
.lead,
.section-head p,
.contact-band p,
.product-copy p,
.product-body p {
  color: var(--muted);
  line-height: 1.85;
}

.hero-text {
  max-width: 650px;
  font-size: 18px;
}

.hero-actions,
.detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-weight: 700;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  border-color: rgba(50, 212, 232, .55);
}

.btn.primary {
  border-color: rgba(50, 212, 232, .45);
  color: #031014;
  background: linear-gradient(135deg, var(--cyan), var(--green));
}

.btn.ghost {
  background: rgba(255, 255, 255, .04);
}

.hero-stage {
  position: relative;
  min-height: 520px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background:
    linear-gradient(150deg, rgba(255,255,255,.08), transparent 45%),
    linear-gradient(180deg, rgba(50, 212, 232, .12), rgba(245, 185, 66, .08)),
    #101820;
  box-shadow: var(--shadow);
}

.hero-stage::before {
  position: absolute;
  inset: 10%;
  content: "";
  border: 1px solid rgba(50, 212, 232, .22);
  transform: perspective(500px) rotateX(58deg) rotateZ(-20deg);
}

.hero-stage::after {
  position: absolute;
  right: 10%;
  bottom: 13%;
  width: 62%;
  height: 26%;
  content: "";
  border: 1px solid rgba(126, 231, 135, .28);
  background: linear-gradient(90deg, rgba(126, 231, 135, .22), transparent);
  transform: skewY(-10deg);
}

.hero-carousel::before,
.hero-carousel::after {
  pointer-events: none;
}

.carousel-track {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 520px;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 28px;
  margin: 0;
  padding: 46px 38px 82px;
  opacity: 0;
  animation: carouselFade 20s infinite;
}

.carousel-slide:nth-child(2) {
  animation-delay: 5s;
}

.carousel-slide:nth-child(3) {
  animation-delay: 10s;
}

.carousel-slide:nth-child(4) {
  animation-delay: 15s;
}

.carousel-slide img {
  width: min(86%, 460px);
  max-height: 330px;
  object-fit: contain;
  filter: drop-shadow(0 26px 34px rgba(0, 0, 0, .5));
  transform: translateY(12px) scale(.96);
  animation: productFloat 5s ease-in-out infinite;
}

.carousel-slide figcaption {
  display: grid;
  gap: 6px;
  min-width: min(360px, 88%);
  padding: 16px 18px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 8px;
  background: rgba(8, 11, 16, .7);
  text-align: center;
  backdrop-filter: blur(16px);
}

.carousel-slide figcaption span {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
}

.carousel-slide figcaption strong {
  font-size: 24px;
}

.carousel-dots {
  position: absolute;
  right: 28px;
  bottom: 28px;
  z-index: 2;
  display: flex;
  gap: 8px;
}

.carousel-dots span {
  width: 34px;
  height: 3px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .2);
  overflow: hidden;
}

.carousel-dots span::before {
  display: block;
  width: 100%;
  height: 100%;
  content: "";
  background: linear-gradient(90deg, var(--cyan), var(--green));
  transform: scaleX(0);
  transform-origin: left;
  animation: dotProgress 20s infinite;
}

.carousel-dots span:nth-child(2)::before {
  animation-delay: 5s;
}

.carousel-dots span:nth-child(3)::before {
  animation-delay: 10s;
}

.carousel-dots span:nth-child(4)::before {
  animation-delay: 15s;
}

@keyframes carouselFade {
  0%, 20% {
    opacity: 1;
  }

  25%, 95% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

@keyframes productFloat {
  0%, 100% {
    transform: translateY(10px) scale(.96);
  }

  50% {
    transform: translateY(-4px) scale(1);
  }
}

@keyframes dotProgress {
  0% {
    transform: scaleX(0);
  }

  20% {
    transform: scaleX(1);
  }

  20.01%, 100% {
    transform: scaleX(0);
  }
}

.section {
  padding: 92px 0;
}

.section-head {
  display: flex;
  flex-direction: column;
  max-width: 720px;
  margin-bottom: 34px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.product-card {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
  box-shadow: 0 18px 50px rgba(0, 0, 0, .2);
  transition: transform .2s ease, border-color .2s ease;
}

.product-card:hover {
  transform: translateY(-4px);
  border-color: rgba(50, 212, 232, .42);
}

.product-media {
  display: grid;
  min-height: 210px;
  place-items: center;
  padding: 22px;
  background:
    radial-gradient(circle at 50% 35%, rgba(50, 212, 232, .2), transparent 52%),
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
}

.product-media img {
  width: 100%;
  max-height: 210px;
  object-fit: contain;
  filter: drop-shadow(0 18px 26px rgba(0, 0, 0, .45));
}

.product-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 22px;
}

.tag {
  width: fit-content;
  margin-bottom: 14px;
  padding: 5px 9px;
  border: 1px solid rgba(50, 212, 232, .36);
  border-radius: 999px;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 700;
}

.tag.accent {
  border-color: rgba(126, 231, 135, .36);
  color: var(--green);
}

.tag.warm {
  border-color: rgba(245, 185, 66, .42);
  color: var(--amber);
}

.tag.steel {
  border-color: rgba(183, 196, 214, .4);
  color: var(--steel);
}

.spec-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: auto 0 18px;
  padding-top: 12px;
}

.spec-row div {
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, .035);
}

dt {
  color: var(--muted);
  font-size: 12px;
}

dd {
  margin: 4px 0 0;
  font-weight: 800;
}

.text-link {
  color: var(--cyan);
  font-weight: 800;
}

.split-section {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.advantage-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.advantage-list div {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, .04);
}

.advantage-list strong,
.advantage-list span {
  display: block;
}

.advantage-list span {
  margin-top: 9px;
  color: var(--muted);
  line-height: 1.7;
}

.contact-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 72px;
  padding: clamp(24px, 5vw, 44px);
  border: 1px solid rgba(50, 212, 232, .28);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(50, 212, 232, .16), rgba(245, 185, 66, .08)),
    rgba(255, 255, 255, .04);
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 26px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.footer-info {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.product-hero {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(300px, .75fr);
  gap: clamp(26px, 5vw, 70px);
  align-items: center;
  padding: 70px 0 48px;
}

.product-visual {
  display: grid;
  min-height: 430px;
  place-items: center;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    radial-gradient(circle at 55% 35%, rgba(50, 212, 232, .2), transparent 48%),
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
}

.product-visual img {
  max-height: 360px;
  object-fit: contain;
  filter: drop-shadow(0 24px 32px rgba(0, 0, 0, .48));
}

.product-detail {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 24px;
  padding: 42px 0 84px;
}

.detail-panel,
.side-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.detail-panel {
  padding: clamp(22px, 4vw, 36px);
}

.detail-block + .detail-block {
  margin-top: 34px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}

.detail-block h2 {
  font-size: 26px;
}

.detail-block p,
.detail-block li {
  color: var(--muted);
  line-height: 1.9;
}

.detail-block ul {
  margin: 0;
  padding-left: 20px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
}

.data-table th,
.data-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.data-table th {
  color: var(--text);
  background: rgba(50, 212, 232, .08);
}

.data-table td {
  color: var(--muted);
}

.side-panel {
  position: sticky;
  top: 92px;
  align-self: start;
  padding: 22px;
}

.side-panel h2 {
  font-size: 22px;
}

.quick-specs {
  display: grid;
  gap: 10px;
  margin: 18px 0 22px;
}

.quick-specs div {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, .035);
}

.breadcrumb {
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--cyan);
}

@media (max-width: 1050px) {
  .product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero,
  .product-hero,
  .product-detail,
  .split-section {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }
}

@media (max-width: 720px) {
  .site-header,
  .top-nav,
  .contact-band,
  .contact-actions,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .top-nav {
    gap: 14px;
  }

  .hero {
    min-height: 0;
    padding-top: 40px;
  }

  .hero-stage,
  .product-visual {
    min-height: 360px;
  }

  .product-grid,
  .advantage-list {
    grid-template-columns: 1fr;
  }

  .spec-row {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 38px;
  }
}