:root {
  color: #111827;
  background: #f7f8fb;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  text-rendering: optimizeLegibility;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(226, 232, 240, 0.9);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 780;
  font-size: 18px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: #fff;
  background: #108cf4;
  border-radius: 10px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: #4b5563;
  font-size: 15px;
}

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
  align-items: center;
  gap: clamp(32px, 7vw, 96px);
  padding: clamp(44px, 7vw, 92px) clamp(20px, 5vw, 72px);
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  margin: 0 0 12px;
  color: #108cf4;
  font-size: 15px;
  font-weight: 750;
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  margin: 0;
  max-width: 720px;
  font-size: clamp(44px, 7vw, 78px);
  line-height: 1.05;
}

h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.14;
}

h3 {
  margin: 0 0 10px;
  font-size: 21px;
}

.lead {
  margin: 24px 0 0;
  max-width: 680px;
  color: #4b5563;
  font-size: 20px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-link,
.secondary-link {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 14px;
  font-weight: 720;
}

.primary-link {
  color: #fff;
  background: #108cf4;
}

.secondary-link {
  background: #fff;
  border: 1px solid #d7dde8;
}

.phone-card {
  width: min(100%, 410px);
  justify-self: center;
  padding: 12px;
  background: #111827;
  border-radius: 36px;
  box-shadow: 0 26px 70px rgba(15, 23, 42, 0.22);
}

.phone-card img {
  width: 100%;
  border-radius: 28px;
}

.section {
  padding: clamp(56px, 8vw, 104px) clamp(20px, 5vw, 72px);
  border-top: 1px solid #e5e7eb;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 34px;
}

.section-heading p:not(.eyebrow) {
  margin: 16px 0 0;
  color: #5b6473;
  font-size: 18px;
  line-height: 1.7;
}

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

.feature-card,
.info-panel,
figure,
.video-frame {
  background: #fff;
  border: 1px solid #e2e8f0;
}

.feature-card {
  min-height: 188px;
  padding: 24px;
  border-radius: 20px;
}

.feature-card p {
  margin: 0;
  color: #5b6473;
  font-size: 16px;
  line-height: 1.7;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
}

.video-frame {
  padding: 14px;
  border-radius: 24px;
  box-shadow: 0 22px 70px rgba(15, 23, 42, 0.12);
}

.video-frame video {
  width: 100%;
  max-height: 720px;
  border-radius: 16px;
  background: #000;
}

.screens-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

figure {
  margin: 0;
  overflow: hidden;
  border-radius: 22px;
}

figure img {
  width: 100%;
  background: #fff;
}

figcaption {
  padding: 14px 16px 18px;
  color: #374151;
  font-weight: 680;
  line-height: 1.45;
}

.info-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 28px;
  margin: clamp(28px, 5vw, 72px);
  padding: clamp(28px, 5vw, 44px);
  border-radius: 24px;
}

.info-list {
  display: grid;
  gap: 14px;
}

.info-list p {
  margin: 0;
  color: #4b5563;
  font-size: 17px;
  line-height: 1.75;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 5vw, 72px);
  color: #6b7280;
  border-top: 1px solid #e5e7eb;
}

@media (max-width: 1080px) {
  .hero,
  .split,
  .info-panel {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    width: 100%;
    overflow-x: auto;
    gap: 18px;
    padding-bottom: 2px;
  }

  .hero {
    min-height: auto;
  }

  h1 {
    font-size: 42px;
  }

  .lead {
    font-size: 17px;
  }

  .feature-grid,
  .screens-grid {
    grid-template-columns: 1fr;
  }

  .phone-card {
    max-width: 330px;
  }

  .footer {
    flex-direction: column;
  }
}