:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5d6676;
  --line: #dfe6ef;
  --panel: #ffffff;
  --soft: #f5f8fb;
  --blue: #2478ff;
  --green: #16a873;
  --amber: #e7a231;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

.topbar {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid rgba(223, 230, 239, 0.8);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 18px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--ink);
  color: #ffffff;
  font-weight: 900;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #334155;
  font-size: 14px;
  font-weight: 650;
}

.hero {
  position: relative;
  min-height: 720px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #edf3f7;
}

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

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(245, 248, 251, 0.98) 0%, rgba(245, 248, 251, 0.88) 32%, rgba(245, 248, 251, 0.16) 68%, rgba(245, 248, 251, 0) 100%);
}

.hero-content {
  position: relative;
  width: min(640px, calc(100% - 40px));
  margin-left: clamp(20px, 7vw, 96px);
  padding-top: 72px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(44px, 6vw, 76px);
  line-height: 1.04;
  font-weight: 900;
}

.hero-copy {
  max-width: 560px;
  margin-bottom: 32px;
  color: #334155;
  font-size: 22px;
  line-height: 1.75;
}

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

.primary-btn,
.secondary-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 8px;
  font-weight: 800;
}

.primary-btn {
  color: #ffffff;
  background: var(--blue);
  box-shadow: 0 12px 28px rgba(36, 120, 255, 0.24);
}

.secondary-btn {
  color: #1f2937;
  background: #ffffff;
  border: 1px solid var(--line);
}

.section {
  padding: 76px clamp(20px, 6vw, 80px);
}

.section-head {
  max-width: 760px;
  margin-bottom: 30px;
}

h2 {
  margin-bottom: 12px;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.18;
}

.section-head p,
.section-copy,
.contact-section p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

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

.feature-card,
.solution-block {
  min-height: 220px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 32px;
  margin-bottom: 22px;
  border-radius: 8px;
  background: #eaf2ff;
  color: var(--blue);
  font-weight: 900;
}

.feature-card:nth-child(2) .feature-icon {
  background: #e7f7f0;
  color: var(--green);
}

.feature-card:nth-child(3) .feature-icon {
  background: #fff4dc;
  color: var(--amber);
}

.feature-card h3,
.solution-block h3 {
  margin-bottom: 12px;
  font-size: 21px;
}

.feature-card p,
.solution-block p,
.step span {
  color: var(--muted);
  line-height: 1.7;
}

.split-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1fr);
  gap: 48px;
  align-items: start;
  background: #ffffff;
}

.steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.step {
  display: grid;
  gap: 8px;
  min-height: 130px;
  padding: 24px;
  border-left: 4px solid var(--blue);
  background: #f6f9fd;
}

.step:nth-child(2) {
  border-left-color: var(--green);
}

.step:nth-child(3) {
  border-left-color: var(--amber);
}

.step:nth-child(4) {
  border-left-color: #6d5dfc;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.contact-section {
  display: flex;
  justify-content: space-between;
  gap: 28px;
  align-items: center;
  margin: 0 clamp(20px, 6vw, 80px) 72px;
  padding: 42px;
  border-radius: 8px;
  color: #ffffff;
  background: #13233a;
}

.contact-section .eyebrow,
.contact-section p {
  color: #d9e7ff;
}

.contact-section h2 {
  margin-bottom: 10px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px clamp(20px, 6vw, 80px);
  color: #677282;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

@media (max-width: 980px) {
  .nav {
    display: none;
  }

  .hero {
    min-height: 660px;
  }

  .hero-overlay {
    background: linear-gradient(180deg, rgba(245, 248, 251, 0.98) 0%, rgba(245, 248, 251, 0.9) 47%, rgba(245, 248, 251, 0.22) 100%);
  }

  .hero-content {
    margin: 0 auto;
    padding-top: 96px;
  }

  .feature-grid,
  .solution-grid,
  .split-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topbar {
    height: 64px;
    padding: 0 16px;
  }

  .brand {
    font-size: 16px;
  }

  .hero {
    min-height: 620px;
  }

  .hero-copy {
    font-size: 18px;
  }

  .section {
    padding: 54px 16px;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .contact-section {
    display: block;
    margin: 0 16px 52px;
    padding: 28px;
  }

  .contact-section .primary-btn {
    width: 100%;
    margin-top: 8px;
  }

  .footer {
    flex-direction: column;
    padding: 24px 16px;
  }
}