:root {
  color-scheme: light;
  --text: #1d2733;
  --muted: #5c6978;
  --line: #dbe4ed;
  --panel: #ffffff;
  --soft: #f4f8fb;
  --brand: #0a7b83;
  --brand-dark: #075a61;
  --accent: #d84f2a;
  --ink: #0f1720;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background: var(--soft);
  line-height: 1.65;
}

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;
  min-height: 72px;
  padding: 0 5vw;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 86px;
  height: 42px;
  padding: 0 12px;
  color: #fff;
  background: var(--brand);
  border-radius: 6px;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0;
  white-space: nowrap;
}

.nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 15px;
}

.nav a:hover {
  color: var(--brand-dark);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  align-items: center;
  gap: 48px;
  min-height: calc(100vh - 72px);
  padding: 58px 5vw 72px;
  background: linear-gradient(115deg, #f8fbfd 0%, #edf6f5 52%, #fff3ee 100%);
}

.hero-copy {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

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

h1 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.12;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 30px;
  line-height: 1.25;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 20px;
  letter-spacing: 0;
}

.lead {
  max-width: 620px;
  color: var(--muted);
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  color: var(--brand-dark);
  border: 1px solid rgba(10, 123, 131, 0.35);
  border-radius: 6px;
  font-weight: 700;
}

.button.primary {
  color: #fff;
  background: var(--brand);
  border-color: var(--brand);
}

.hero-visual {
  display: grid;
  place-items: center;
  min-height: min(58vh, 560px);
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(25, 56, 68, 0.18);
  background:
    radial-gradient(circle at 34% 24%, rgba(216, 79, 42, 0.18), transparent 26%),
    radial-gradient(circle at 70% 68%, rgba(10, 123, 131, 0.22), transparent 32%),
    linear-gradient(135deg, #ffffff 0%, #eaf5f7 100%);
}

.device-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: min(78%, 520px);
  aspect-ratio: 1 / 1;
}

.camera-body {
  position: relative;
  display: grid;
  place-items: center;
  width: 58%;
  aspect-ratio: 1 / 1;
  background: linear-gradient(145deg, #ffffff, #d8e6ee);
  border: 1px solid rgba(15, 23, 32, 0.08);
  border-radius: 50%;
  box-shadow: inset 0 -18px 34px rgba(19, 43, 54, 0.12), 0 28px 60px rgba(19, 43, 54, 0.2);
}

.camera-lens {
  display: block;
  width: 46%;
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 38% 35%, #ffffff 0 5%, transparent 6%),
    radial-gradient(circle, #17404a 0 34%, #081820 35% 62%, #031016 63%);
  border: 12px solid #f7fbfd;
  border-radius: 50%;
  box-shadow: 0 10px 26px rgba(15, 23, 32, 0.26);
}

.camera-sensor {
  position: absolute;
  top: 23%;
  right: 27%;
  width: 11px;
  height: 11px;
  background: var(--accent);
  border-radius: 50%;
}

.camera-stand {
  position: absolute;
  bottom: 12%;
  width: 34%;
  height: 11%;
  background: linear-gradient(180deg, #d8e6ee, #ffffff);
  border-radius: 999px 999px 8px 8px;
  box-shadow: 0 18px 36px rgba(19, 43, 54, 0.16);
}

.signal-ring {
  position: absolute;
  border: 2px solid rgba(10, 123, 131, 0.22);
  border-radius: 50%;
}

.ring-one {
  width: 78%;
  height: 78%;
}

.ring-two {
  width: 96%;
  height: 96%;
  border-color: rgba(216, 79, 42, 0.18);
}

.section {
  padding: 78px 5vw;
}

.intro,
.service,
.contact {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: 42px;
  align-items: start;
  background: #fff;
}

.intro p,
.service p,
.contact p,
.product-card p,
.feature-grid p {
  color: var(--muted);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 30px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.product-card {
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.product-visual {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #f9fcfd, #e7f1f3);
}

.product-visual::before {
  content: "";
  position: absolute;
  inset: 18%;
  border: 1px solid rgba(10, 123, 131, 0.16);
  border-radius: 50%;
}

.mini-camera,
.bullet-camera,
.battery-camera {
  position: relative;
  display: block;
  background: #fff;
  border: 1px solid rgba(15, 23, 32, 0.1);
  box-shadow: 0 18px 38px rgba(25, 56, 68, 0.16);
}

.mini-camera {
  width: 92px;
  height: 124px;
  border-radius: 46px 46px 22px 22px;
}

.mini-camera::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 25px;
  width: 42px;
  height: 42px;
  background: radial-gradient(circle at 35% 35%, #fff 0 8%, #183e48 9% 44%, #061118 45%);
  border-radius: 50%;
}

.mini-camera::after {
  content: "";
  position: absolute;
  bottom: -18px;
  left: 19px;
  width: 54px;
  height: 24px;
  background: #dce8ee;
  border-radius: 4px 4px 18px 18px;
}

.bullet-camera {
  width: 150px;
  height: 64px;
  border-radius: 34px 16px 16px 34px;
}

.bullet-camera::before {
  content: "";
  position: absolute;
  top: 16px;
  left: 18px;
  width: 32px;
  height: 32px;
  background: radial-gradient(circle at 35% 35%, #fff 0 8%, #173b45 9% 48%, #071218 49%);
  border-radius: 50%;
}

.bullet-camera::after {
  content: "";
  position: absolute;
  right: -22px;
  top: 18px;
  width: 30px;
  height: 28px;
  background: #d8e6ee;
  border-radius: 0 14px 14px 0;
}

.battery-camera {
  width: 92px;
  height: 128px;
  border-radius: 18px;
}

.battery-camera::before {
  content: "";
  position: absolute;
  top: 18px;
  left: 25px;
  width: 42px;
  height: 42px;
  background: radial-gradient(circle at 35% 35%, #fff 0 8%, #183e48 9% 44%, #061118 45%);
  border-radius: 50%;
}

.battery-camera::after {
  content: "";
  position: absolute;
  right: 16px;
  bottom: 20px;
  width: 22px;
  height: 42px;
  border: 2px solid var(--brand);
  border-radius: 4px;
}

.product-card div {
  padding: 22px;
}

.feature-band {
  background: #eaf3f4;
}

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

.feature-grid div {
  min-height: 170px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(10, 123, 131, 0.14);
  border-radius: 8px;
}

.feature-grid strong {
  display: block;
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 18px;
}

.service-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.service-list li {
  padding: 16px 18px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.contact {
  background: #f8fafc;
}

.contact-panel {
  display: grid;
  gap: 8px;
  padding: 26px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.contact-panel span {
  color: var(--muted);
  font-size: 14px;
}

.contact-panel strong {
  margin-bottom: 10px;
  color: var(--ink);
  font-size: 20px;
}

.site-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  min-height: 78px;
  padding: 18px 5vw;
  color: rgba(255, 255, 255, 0.86);
  background: #111923;
  font-size: 14px;
}

.site-footer a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 900px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 5vw;
  }

  .nav {
    flex-wrap: wrap;
    gap: 14px;
  }

  .hero,
  .intro,
  .service,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 42px;
  }

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

  .site-footer {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 560px) {
  .brand {
    white-space: normal;
  }

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 26px;
  }

  .lead {
    font-size: 18px;
  }

  .section {
    padding: 58px 5vw;
  }
}