:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --ink: #142033;
  --muted: #5f6f85;
  --line: #d9e1ec;
  --primary: #176c8f;
  --primary-dark: #0d4058;
  --accent: #e6a756;
  --soft: #e9f3f7;
  --shadow: 0 24px 70px rgba(18, 35, 56, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 0%, rgba(23, 108, 143, 0.12), transparent 32rem),
    linear-gradient(180deg, #fbfcfe 0%, var(--bg) 52%, #eef4f8 100%);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.65;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: 72px;
  padding: 0 6vw;
  border-bottom: 1px solid rgba(217, 225, 236, 0.78);
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  font-weight: 800;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(320px, 0.72fr);
  gap: 4rem;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: 7rem 6vw 6rem;
}

.hero h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2.5rem, 5.2vw, 5.4rem);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero p {
  max-width: 680px;
  margin: 1.6rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.45vw, 1.22rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 1.25rem;
  border-radius: 8px;
  font-weight: 700;
}

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

.button.secondary {
  color: var(--primary-dark);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
}

.hero-visual {
  display: grid;
  place-items: center;
}

.visual-window {
  width: min(100%, 440px);
  padding: 1rem;
  border: 1px solid rgba(217, 225, 236, 0.92);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.window-bar {
  display: flex;
  gap: 0.45rem;
  padding: 0.25rem 0 1rem;
}

.window-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line);
}

.code-lines {
  display: grid;
  gap: 0.85rem;
  padding: 1.2rem;
  border-radius: 8px;
  background: #122033;
}

.code-lines i {
  display: block;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, #68d4b7, #a6d8ff);
}

.metric-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  border-radius: 8px;
  background: var(--soft);
}

.metric-row strong {
  color: var(--primary-dark);
  font-size: 2rem;
}

.metric-row span {
  color: var(--muted);
}

.section {
  padding: 5.5rem 6vw;
}

.section-head {
  max-width: 720px;
  margin-bottom: 2rem;
}

h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.85rem, 3vw, 3rem);
  line-height: 1.18;
}

h3 {
  margin: 0 0 0.65rem;
  font-size: 1.12rem;
}

p {
  color: var(--muted);
}

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

.service-grid article {
  min-height: 230px;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.84);
}

.service-grid p {
  margin: 0;
  font-size: 0.98rem;
}

.band {
  padding: 0 6vw;
}

.band-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.64fr);
  gap: 3rem;
  align-items: center;
  padding: 4rem;
  border-radius: 8px;
  color: #fff;
  background:
    linear-gradient(135deg, rgba(20, 32, 51, 0.96), rgba(13, 64, 88, 0.94)),
    linear-gradient(90deg, var(--primary), var(--primary-dark));
}

.band-inner p {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.76);
}

.check-list {
  display: grid;
  gap: 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 0.8rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(280px, 0.6fr);
  gap: 3rem;
  align-items: start;
}

.facts {
  display: grid;
  gap: 1rem;
}

.facts div {
  padding: 1.3rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.facts strong {
  display: block;
  font-size: 1.35rem;
}

.facts span {
  color: var(--muted);
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(300px, 0.7fr);
  gap: 3rem;
  margin: 0 6vw 5rem;
  padding: 3rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 18px 50px rgba(18, 35, 56, 0.08);
}

address {
  display: grid;
  gap: 0.7rem;
  color: var(--muted);
  font-style: normal;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 1.5rem;
  padding: 2rem 6vw;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer a {
  color: var(--primary);
}

.policy {
  max-width: 880px;
  margin: 0 auto;
  padding: 6rem 6vw;
}

.policy h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4rem);
}

.policy-date {
  margin-bottom: 3rem;
}

.policy section {
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
}

.policy h2 {
  font-size: 1.35rem;
}

@media (max-width: 920px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 1rem 5vw;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
    gap: 0.5rem;
  }

  .hero,
  .band-inner,
  .split,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding: 4rem 5vw;
  }

  .section {
    padding: 4rem 5vw;
  }

  .band,
  .contact {
    margin-left: 5vw;
    margin-right: 5vw;
    padding-left: 0;
    padding-right: 0;
  }

  .band-inner,
  .contact {
    padding: 2rem;
  }

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

@media (max-width: 620px) {
  .brand {
    font-size: 0.95rem;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .hero-actions,
  .button {
    width: 100%;
  }

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

  .service-grid article {
    min-height: auto;
  }
}