:root {
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --soft: #f5f5f7;
  --line: rgba(0, 0, 0, 0.1);
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --white: #ffffff;
  --shadow: 0 34px 90px rgba(0, 0, 0, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial,
    sans-serif;
  background: var(--white);
  letter-spacing: 0;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  height: 52px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  background: rgba(251, 251, 253, 0.82);
  backdrop-filter: saturate(180%) blur(22px);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100%, 1100px);
  height: 100%;
  margin: 0 auto;
  padding: 0 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.brand img {
  width: 30px;
  height: 24px;
  object-fit: contain;
}

.brand span {
  overflow: hidden;
  max-width: 180px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  color: rgba(29, 29, 31, 0.76);
  font-size: 13px;
}

.site-nav a {
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

.site-nav a:hover {
  color: var(--ink);
}

.menu-toggle {
  display: none;
  width: 34px;
  height: 34px;
  padding: 0;
  border: 0;
  background: transparent;
}

.menu-toggle span {
  display: block;
  width: 17px;
  height: 1px;
  margin: 5px auto;
  background: var(--ink);
}

.hero {
  display: grid;
  justify-items: center;
  min-height: calc(100vh - 52px);
  padding: 70px 22px 34px;
  overflow: hidden;
  text-align: center;
  background:
    radial-gradient(circle at 50% 78%, rgba(0, 113, 227, 0.14), transparent 34%),
    linear-gradient(180deg, #fbfbfd 0%, #ffffff 48%, #f5f5f7 100%);
}

.eyebrow {
  margin: 0 0 13px;
  color: #86868b;
  font-size: 15px;
  font-weight: 600;
}

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

h1 {
  max-width: 820px;
  margin-bottom: 18px;
  font-size: clamp(44px, 6.7vw, 76px);
  line-height: 1.08;
  font-weight: 700;
}

h1 span {
  white-space: nowrap;
}

.hero-text {
  max-width: 760px;
  margin-bottom: 23px;
  color: #424245;
  font-size: clamp(20px, 2.3vw, 28px);
  line-height: 1.36;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin-bottom: 44px;
}

.link-action {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--blue);
  font-size: 19px;
}

.link-action::after {
  content: ">";
  margin-left: 7px;
  font-size: 17px;
}

.link-action:hover {
  color: var(--blue-hover);
}

.product-stage {
  width: min(100%, 1030px);
  padding: 0 clamp(0px, 2vw, 24px);
}

.device {
  position: relative;
  min-height: 470px;
  padding: 18px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 38px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(242, 242, 244, 0.92));
  box-shadow: var(--shadow);
}

.device::before {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 28px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  pointer-events: none;
}

.device-top {
  display: flex;
  gap: 8px;
  padding: 8px 10px 0;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #d2d2d7;
}

.device-body {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1.18fr 1fr;
  align-items: center;
  gap: 26px;
  min-height: 292px;
  padding: 28px 28px 10px;
}

.device-body::before,
.device-body::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 23%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(0, 113, 227, 0.36), transparent);
}

.device-body::before {
  left: 24%;
}

.device-body::after {
  right: 24%;
}

.signal-column,
.cloud-core {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  min-height: 170px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.74);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.signal-column {
  gap: 8px;
  align-content: center;
  padding: 24px;
}

.signal-column span,
.device-stats span,
.spec-item span {
  color: var(--muted);
}

.signal-column strong {
  font-size: 22px;
}

.cloud-core {
  min-height: 215px;
  background:
    radial-gradient(circle at 50% 45%, rgba(0, 113, 227, 0.14), transparent 42%),
    rgba(255, 255, 255, 0.82);
}

.cloud-core img {
  width: min(58%, 220px);
  filter: drop-shadow(0 16px 25px rgba(0, 113, 227, 0.18));
}

.device-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding: 0 28px 26px;
}

.device-stats div {
  display: grid;
  gap: 8px;
  min-height: 98px;
  align-content: center;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.07);
}

.device-stats strong {
  color: var(--ink);
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1;
}

.section,
.immersive-section,
.contact-section {
  padding: clamp(74px, 8vw, 118px) 22px;
}

.section-light {
  background: var(--soft);
}

.section-heading {
  width: min(100%, 760px);
  margin: 0 auto 44px;
}

.section-heading.centered {
  text-align: center;
}

.section-heading h2,
.immersive-copy h2,
.contact-copy h2 {
  margin-bottom: 15px;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.06;
  font-weight: 700;
}

.section-heading p,
.immersive-copy p,
.contact-copy p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 21px;
  line-height: 1.45;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  width: min(100%, 1120px);
  margin: 0 auto;
}

.feature-card,
.timeline-step {
  min-height: 276px;
  padding: 30px;
  border-radius: 28px;
  background: var(--white);
}

.feature-card span,
.timeline-step span {
  display: inline-flex;
  margin-bottom: 44px;
  color: var(--blue);
  font-size: 17px;
  font-weight: 700;
}

.feature-card h3,
.timeline-step h3,
.spec-item strong {
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.15;
}

.feature-card p,
.timeline-step p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.58;
}

.immersive-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.85fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: center;
  width: min(100%, 1180px);
  margin: 0 auto;
}

.immersive-copy {
  max-width: 620px;
}

.spec-list {
  display: grid;
  gap: 16px;
}

.spec-item {
  display: grid;
  gap: 8px;
  min-height: 128px;
  align-content: center;
  padding: 24px 28px;
  border-radius: 28px;
  background: var(--soft);
}

.spec-item span {
  font-size: 17px;
  line-height: 1.55;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  width: min(100%, 1120px);
  margin: 0 auto;
}

.timeline-step {
  background: var(--soft);
}

.contact-section {
  background: var(--soft);
}

.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 0.78fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
  width: min(100%, 1120px);
  margin: 0 auto;
  padding: clamp(28px, 5vw, 64px);
  border-radius: 38px;
  background: var(--white);
}

.contact-form {
  display: grid;
  gap: 16px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
}

.contact-form input {
  width: 100%;
  min-height: 48px;
  padding: 13px 15px;
  border: 1px solid #d2d2d7;
  border-radius: 14px;
  background: #fbfbfd;
  color: var(--ink);
  font: inherit;
}

.contact-form input:focus {
  outline: 4px solid rgba(0, 113, 227, 0.16);
  border-color: var(--blue);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 0;
  border-radius: 980px;
  background: var(--blue);
  color: var(--white);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.button:hover {
  background: var(--blue-hover);
}

.form-note {
  min-height: 22px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.form-note.success {
  color: #147a3d;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  width: min(100%, 1120px);
  margin: 0 auto;
  padding: 28px 22px 34px;
  color: var(--muted);
  font-size: 13px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.footer-brand img {
  width: 30px;
  height: 24px;
  object-fit: contain;
}

.footer-brand span {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px 20px;
}

.footer-links a:hover {
  color: var(--blue);
}

@media (max-width: 980px) {
  .feature-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .immersive-section,
  .contact-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 50px;
  }

  .nav-shell {
    padding: 0 18px;
  }

  .brand span {
    max-width: 45vw;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 50px;
    left: 0;
    right: 0;
    display: none;
    grid-template-columns: 1fr;
    gap: 0;
    padding: 8px 18px 18px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    background: rgba(251, 251, 253, 0.96);
    backdrop-filter: saturate(180%) blur(22px);
    font-size: 17px;
  }

  .site-nav.open {
    display: grid;
  }

  .site-nav a {
    min-height: 46px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
  }

  .hero {
    min-height: auto;
    padding-top: 56px;
  }

  h1 {
    font-size: 38px;
  }

  .hero-text {
    font-size: 21px;
  }

  .hero-actions {
    gap: 22px;
    margin-bottom: 30px;
  }

  .link-action {
    font-size: 18px;
  }

  .device {
    min-height: auto;
    border-radius: 28px;
  }

  .device::before {
    border-radius: 20px;
  }

  .device-body {
    grid-template-columns: 1fr;
    min-height: auto;
    gap: 14px;
    padding: 24px 10px 12px;
  }

  .device-body::before,
  .device-body::after {
    display: none;
  }

  .signal-column,
  .cloud-core {
    min-height: 108px;
    border-radius: 20px;
  }

  .cloud-core {
    min-height: 136px;
  }

  .device-stats,
  .feature-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .device-stats {
    padding: 0 10px 12px;
  }

  .device-stats div {
    min-height: 90px;
    border-radius: 20px;
  }

  .feature-card,
  .timeline-step,
  .spec-item {
    min-height: auto;
    border-radius: 24px;
  }

  .feature-card span,
  .timeline-step span {
    margin-bottom: 28px;
  }

  .section-heading h2,
  .immersive-copy h2,
  .contact-copy h2 {
    font-size: 38px;
  }

  .section-heading p,
  .immersive-copy p,
  .contact-copy p {
    font-size: 19px;
  }

  .contact-card {
    padding: 26px;
    border-radius: 28px;
  }

  .site-footer {
    display: grid;
    align-items: start;
  }

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 420px) {
  h1 {
    font-size: 34px;
  }

  .hero-actions {
    flex-wrap: wrap;
  }

  .section,
  .immersive-section,
  .contact-section {
    padding-left: 18px;
    padding-right: 18px;
  }
}