:root {
  color-scheme: light;
  --text: #12211b;
  --muted: #66736d;
  --subtle: #f4f7f5;
  --surface: #ffffff;
  --line: #dfe8e4;
  --blue: #0757b8;
  --green: #2d9d63;
  --blue-soft: #eaf3ff;
  --green-soft: #ecf8f1;
  --shadow: 0 18px 48px rgba(20, 36, 30, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100svh;
  margin: 0;
  background: #fbfcfb;
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  letter-spacing: 0;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 16px max(24px, calc((100vw - 1120px) / 2));
  border-bottom: 1px solid rgba(223, 232, 228, 0.78);
  background: rgba(251, 252, 251, 0.92);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-size: 17px;
  font-weight: 720;
}

.brand img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

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

.nav a {
  text-decoration: none;
}

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

main {
  overflow: hidden;
}

.hero,
.section,
.product-section {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) 420px;
  gap: 56px;
  align-items: center;
  min-height: calc(100svh - 72px);
  padding: 70px 0 84px;
}

.hero-copy {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.45;
}

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

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 6.4vw, 76px);
  line-height: 1.03;
  font-weight: 780;
}

h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.16;
  font-weight: 760;
}

h3 {
  margin: 18px 0 10px;
  font-size: 21px;
  line-height: 1.35;
}

.lead {
  max-width: 700px;
  margin: 26px 0 0;
  color: #304239;
  font-size: 19px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 680;
  text-decoration: none;
}

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

.button.secondary {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
}

.hero-visual {
  position: relative;
  min-height: 440px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(234, 243, 255, 0.72), rgba(236, 248, 241, 0.76)),
    var(--surface);
  box-shadow: var(--shadow);
}

.hero-logo {
  width: 190px;
  height: 190px;
  object-fit: contain;
}

.loop {
  position: absolute;
  inset: auto 26px 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.loop span {
  min-height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  color: #24362e;
  font-size: 14px;
  font-weight: 650;
}

.section {
  padding: 72px 0;
}

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

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.capability,
.step {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.capability {
  min-height: 240px;
  padding: 24px;
}

.number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 30px;
  border-radius: 8px;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 13px;
  font-weight: 760;
}

.capability p,
.product-copy p,
.step p,
.principles p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.product-section {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 46px;
  align-items: start;
  padding: 72px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.product-copy p {
  margin-top: 20px;
}

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

.advantages {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 10px;
}

.advantages article {
  min-height: 150px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--subtle);
}

.advantages strong {
  display: block;
  color: var(--text);
  font-size: 17px;
  line-height: 1.45;
}

.advantages p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.step {
  min-height: 170px;
  padding: 22px;
}

.step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--green-soft);
  color: var(--green);
  font-size: 14px;
  font-weight: 760;
}

.step strong {
  display: block;
  margin: 18px 0 8px;
  color: var(--text);
  font-size: 19px;
}

.compact {
  display: grid;
  grid-template-columns: 0.8fr 1fr;
  gap: 56px;
  align-items: start;
}

.principles {
  display: grid;
  gap: 14px;
}

.principles p {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.principles p:first-child {
  border-top: 1px solid var(--line);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 34px 0 38px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.footer strong,
.footer span {
  display: block;
}

.footer strong {
  color: var(--text);
  font-size: 15px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  justify-content: flex-end;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
}

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

@media (max-width: 860px) {
  .site-header {
    min-height: 64px;
    padding: 12px 20px;
  }

  .brand span {
    font-size: 16px;
  }

  .nav {
    gap: 14px;
    font-size: 13px;
  }

  .hero,
  .section,
  .product-section,
  .footer {
    width: min(100% - 40px, 1120px);
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    min-height: auto;
    padding: 54px 0 62px;
  }

  h1 {
    font-size: clamp(38px, 11vw, 52px);
  }

  .lead {
    font-size: 17px;
  }

  .hero-actions {
    margin-top: 28px;
  }

  .button {
    flex: 1 1 150px;
  }

  .hero-visual {
    min-height: 330px;
  }

  .hero-logo {
    width: 142px;
    height: 142px;
  }

  .loop {
    inset: auto 18px 18px;
  }

  .capability-grid,
  .product-section,
  .steps,
  .advantages,
  .compact {
    grid-template-columns: 1fr;
  }

  .section,
  .product-section {
    padding: 56px 0;
  }

  .capability,
  .step {
    min-height: auto;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
  }

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

@media (max-width: 420px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
  }

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

  .hero-visual {
    min-height: 390px;
  }
}