:root {
  color-scheme: light;
  --ink: #102033;
  --muted: #5f6c7b;
  --line: #d8e3ee;
  --paper: #ffffff;
  --soft: #f4f8fc;
  --tint: #eaf4f3;
  --accent: #0969da;
  --accent-dark: #0758ba;
  --green: #12825b;
  --warm: #f28b24;
  --shadow: 0 22px 60px rgba(16, 32, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei UI", "PingFang SC", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
}

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(22px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(216, 227, 238, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 900;
}

.brand img {
  width: 36px;
  height: 36px;
}

nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.nav-button,
.primary,
.secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  font-weight: 900;
}

.nav-button,
.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.primary:hover,
.nav-button:hover {
  background: var(--accent-dark);
}

.hero {
  position: relative;
  min-height: 86vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 124px clamp(22px, 5vw, 72px) 88px;
  background: #f7fbfd;
  border-bottom: 1px solid var(--line);
}

.hero-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
}

.hero-shade {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(249, 252, 254, 1) 0%, rgba(249, 252, 254, 0.94) 35%, rgba(249, 252, 254, 0.45) 68%, rgba(249, 252, 254, 0.1) 100%),
    linear-gradient(180deg, rgba(249, 252, 254, 0) 72%, rgba(255, 255, 255, 0.98) 100%);
}

.hero-content {
  position: relative;
  width: min(620px, 100%);
}

.eyebrow,
.section-title p {
  margin: 0 0 12px;
  color: var(--green);
  font-size: 13px;
  font-weight: 900;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(46px, 7vw, 82px);
  line-height: 1.02;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 14px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  font-size: 20px;
}

.lead {
  max-width: 570px;
  margin-bottom: 28px;
  color: #314155;
  font-size: 18px;
  line-height: 1.82;
}

.hero-actions,
.hero-proof {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-actions .primary,
.hero-actions .secondary {
  min-height: 48px;
  padding: 0 22px;
}

.hero-proof {
  margin-top: 26px;
}

.hero-proof span {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border: 1px solid rgba(18, 130, 91, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  color: #255243;
  font-size: 13px;
  font-weight: 900;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.summary-strip div {
  padding: 26px clamp(22px, 5vw, 72px);
  background: #ffffff;
}

.summary-strip strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.summary-strip span {
  color: var(--muted);
  line-height: 1.6;
}

.section {
  padding: 78px clamp(22px, 5vw, 72px);
}

.section-title {
  width: min(780px, 100%);
  margin-bottom: 30px;
}

.feature-section {
  background: var(--paper);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid article,
.scene-grid article,
.steps article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--soft);
}

.feature-grid article {
  min-height: 230px;
  padding: 24px;
}

.feature-grid span {
  color: var(--accent);
  font-size: 13px;
  font-weight: 900;
}

.feature-grid h3 {
  margin: 22px 0 10px;
}

.feature-grid p,
.scene-grid p,
.steps p,
.download-band p {
  color: var(--muted);
  line-height: 1.72;
}

.scene-band {
  padding: 78px clamp(22px, 5vw, 72px);
  background:
    linear-gradient(90deg, #edf6f4 0%, #f6f9fc 58%, #fff8ef 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.scene-grid article {
  min-height: 190px;
  padding: 26px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 14px 40px rgba(16, 32, 51, 0.08);
}

.scene-grid h3 {
  margin-bottom: 12px;
}

.steps-section {
  background: #ffffff;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.steps article {
  position: relative;
  min-height: 220px;
  padding: 26px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.steps span {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border-radius: 8px;
  background: #102033;
  color: #ffffff;
  font-weight: 900;
}

.steps article:nth-child(2) span {
  background: var(--accent);
}

.steps article:nth-child(3) span {
  background: var(--green);
}

.download-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin: 0 clamp(22px, 5vw, 72px) 76px;
  padding: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #102033;
  color: #ffffff;
  box-shadow: var(--shadow);
}

.download-band div {
  width: min(720px, 100%);
}

.download-band .eyebrow {
  color: #7be0b9;
}

.download-band h2 {
  margin-bottom: 12px;
  font-size: clamp(26px, 3vw, 38px);
}

.download-band p {
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.72);
}

.download-band .primary {
  flex: 0 0 auto;
  min-width: 140px;
  min-height: 48px;
}

footer {
  min-height: 84px;
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

footer span {
  color: var(--ink);
  font-weight: 900;
}

@media (max-width: 980px) {
  .site-header {
    height: auto;
    min-height: 68px;
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  nav {
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: 780px;
    align-items: flex-end;
    padding-top: 150px;
  }

  .hero-media {
    object-position: center top;
  }

  .hero-shade {
    background:
      linear-gradient(180deg, rgba(249, 252, 254, 0.12) 0%, rgba(249, 252, 254, 0.88) 45%, rgba(255, 255, 255, 1) 100%);
  }

  .summary-strip,
  .feature-grid,
  .scene-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .feature-grid article,
  .scene-grid article,
  .steps article {
    min-height: 0;
  }

  .download-band {
    align-items: stretch;
    flex-direction: column;
    margin-bottom: 54px;
    padding: 28px;
  }

  .download-band .primary {
    width: 100%;
  }
}