:root {
  --background: #f4f7f8;
  --surface: #fafdfe;
  --surface-strong: #ffffff;
  --surface-cool: #e8eff0;
  --foreground: #143f3a;
  --muted: #5f7074;
  --teal: #2f7f7a;
  --teal-dark: #195b57;
  --teal-soft: #6f9f9b;
  --silver: #d4e0e2;
  --line: rgba(20, 63, 58, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--foreground);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
}

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

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

main {
  position: relative;
  z-index: 1;
  overflow: hidden;
}

.photo-backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(180px, 1fr));
  grid-auto-rows: minmax(180px, 26vh);
  gap: 12px;
  padding: 12px;
  background: var(--background);
  opacity: 0.12;
  pointer-events: none;
}

.photo-backdrop::after {
  position: fixed;
  inset: 0;
  content: "";
  background:
    linear-gradient(90deg, rgba(244, 247, 248, 0.98), rgba(244, 247, 248, 0.88)),
    rgba(244, 247, 248, 0.58);
}

.photo-backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.82) contrast(0.92);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 80px;
  padding: 12px clamp(24px, 5vw, 76px);
  background: rgba(250, 253, 254, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}

.brand img {
  width: 166px;
  height: auto;
}

nav {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
  color: var(--muted);
  font-size: 15px;
  white-space: nowrap;
}

nav a:hover {
  color: var(--teal-dark);
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.72fr);
  align-items: center;
  gap: clamp(36px, 7vw, 112px);
  min-height: calc(100vh - 88px);
  padding: clamp(64px, 8vw, 112px) clamp(24px, 5vw, 76px) clamp(62px, 7vw, 96px);
}

.hero::before {
  position: absolute;
  top: clamp(40px, 7vw, 92px);
  left: clamp(24px, 5vw, 76px);
  width: min(520px, 42vw);
  height: 1px;
  content: "";
  background: rgba(47, 127, 122, 0.34);
}

.hero-copy {
  position: relative;
  max-width: 790px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  backdrop-filter: none;
}

.hero-copy::before {
  position: absolute;
  top: 2px;
  left: -28px;
  width: 2px;
  height: 116px;
  content: "";
  background: linear-gradient(180deg, var(--teal), rgba(47, 127, 122, 0));
}

.eyebrow,
.section-kicker {
  margin: 0 0 18px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 860px;
  margin-bottom: 22px;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  font-size: clamp(46px, 6.8vw, 96px);
  font-weight: 600;
  line-height: 1.08;
}

h2 {
  margin-bottom: 16px;
  font-family: "Songti SC", "STSong", "Noto Serif SC", serif;
  font-size: clamp(32px, 5vw, 62px);
  font-weight: 700;
  line-height: 1.12;
}

h3 {
  margin-bottom: 12px;
  font-size: 22px;
  line-height: 1.25;
}

.hero-subtitle {
  width: fit-content;
  margin-bottom: 24px;
  padding: 9px 0;
  background: rgba(232, 239, 240, 0.72);
  border-radius: 999px;
  padding: 10px 24px;
  border-top: 1px solid rgba(47, 127, 122, 0.28);
  border-bottom: 1px solid rgba(47, 127, 122, 0.18);
  color: var(--teal-dark);
  font-size: clamp(18px, 1.7vw, 24px);
  font-weight: 600;
  letter-spacing: 0.03em;
}

.hero-text,
.section-heading p,
.prose p,
.network-layout p,
.contact p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.9;
}

.hero-text {
  max-width: 680px;
  color: rgba(20, 63, 58, 0.68);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 999px;
  font-weight: 600;
}

.primary-action {
  background: var(--teal);
  color: #ffffff;
}

.secondary-action {
  border: 1px solid rgba(47, 127, 122, 0.26);
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.72);
}

.hero-media {
  position: relative;
  min-height: clamp(520px, 62vh, 720px);
  border-radius: 0;
  overflow: hidden;
  background: #dfe8ea;
  box-shadow: 0 28px 80px rgba(20, 63, 58, 0.14);
  clip-path: inset(0 round 2px);
}

.hero-media::after {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(180deg, rgba(31, 63, 58, 0.02), rgba(31, 63, 58, 0.24)),
    linear-gradient(90deg, rgba(244, 247, 248, 0.1), transparent 42%);
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.section {
  position: relative;
  padding: clamp(64px, 9vw, 122px) clamp(20px, 5vw, 72px);
  background: rgba(250, 253, 254, 0.88);
  backdrop-filter: blur(3px);
}

.muted {
  background: rgba(232, 239, 240, 0.88);
}

.split,
.network-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 78px);
  align-items: start;
}

.section-heading {
  max-width: 860px;
  margin-bottom: 36px;
}

.advantage-section {
  background: rgba(16, 47, 45, 0.96);
  color: #ffffff;
}

.advantage-section .section-kicker {
  color: #9bd0ce;
}

.advantage-section .section-heading p {
  color: rgba(226, 239, 241, 0.78);
}

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

.info-card {
  min-height: 260px;
  padding: 28px;
  border: 1px solid rgba(212, 224, 226, 0.8);
  border-radius: 2px;
  background: var(--surface);
}

.advantage-section .info-card {
  border-color: rgba(155, 208, 206, 0.22);
  background: linear-gradient(180deg, rgba(250, 253, 254, 0.96), rgba(232, 239, 240, 0.92));
}

.card-mark {
  display: block;
  width: 36px;
  height: 3px;
  margin-bottom: 34px;
  background: var(--teal);
}

.info-card p,
.tech-list p {
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.8;
}

.process {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--surface-strong);
}

.process-step {
  min-height: 150px;
  padding: 24px 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.process-step span {
  display: block;
  margin-bottom: 34px;
  color: var(--teal);
  font-weight: 800;
}

.process-step strong {
  font-size: 18px;
}

.tech-section {
  background: rgba(255, 255, 255, 0.92);
}

.tech-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.tech-list article {
  min-height: 210px;
  padding: 30px;
  background: var(--surface-strong);
}

.network-layout {
  align-items: center;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 34px;
}

.stats div {
  min-height: 116px;
  padding: 18px;
  border-top: 3px solid var(--teal);
  background: rgba(255, 255, 255, 0.76);
}

.stats strong {
  display: block;
  margin-bottom: 8px;
  color: var(--teal-dark);
  font-size: 42px;
  line-height: 1;
}

.stats span {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.map {
  width: 100%;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--surface);
}

.commitment-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.commitment {
  min-height: 92px;
  display: flex;
  align-items: center;
  padding: 22px;
  border: 1px solid rgba(47, 127, 122, 0.18);
  border-radius: 2px;
  background: var(--surface);
  color: var(--teal-dark);
  font-size: 18px;
  font-weight: 700;
}

.notice {
  margin-top: 22px;
  padding: 22px 24px;
  border-left: 4px solid var(--teal-soft);
  background: #eef4f5;
  color: #40595d;
  font-size: 15px;
  line-height: 1.8;
}

.contact {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  align-items: center;
  gap: 34px;
  padding: clamp(58px, 7vw, 96px) clamp(20px, 5vw, 72px);
  background: var(--teal-dark);
  color: #ffffff;
}

.contact h2 {
  max-width: 880px;
}

.contact p,
.contact .eyebrow {
  color: rgba(226, 239, 241, 0.82);
}

.qr-box {
  justify-self: end;
  width: 220px;
  padding: 16px;
  border-radius: 2px;
  background: #ffffff;
  color: var(--foreground);
  text-align: center;
}

.qr-box img {
  width: 100%;
  border-radius: 4px;
}

.qr-box span {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 700;
}

footer {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  padding: 26px clamp(20px, 5vw, 72px);
  background: #0f2e2b;
  color: rgba(226, 239, 241, 0.86);
  font-size: 14px;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .hero,
  .split,
  .network-layout,
  .contact {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero::before {
    width: min(360px, 70vw);
  }

  .hero-copy::before {
    left: -18px;
  }

  .hero-media {
    min-height: 360px;
  }

  .advantage-grid,
  .process,
  .commitment-grid,
  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .qr-box {
    justify-self: start;
  }
}

@media (max-width: 640px) {
  .brand img {
    width: 158px;
  }

  nav {
    font-size: 14px;
  }

  .hero {
    padding-top: 38px;
  }

  .hero::before,
  .hero-copy::before {
    display: none;
  }

  .hero-media {
    min-height: 300px;
  }

  .advantage-grid,
  .process,
  .tech-list,
  .commitment-grid,
  .stats {
    grid-template-columns: 1fr;
  }

  .info-card,
  .tech-list article {
    min-height: auto;
  }

  .contact {
    padding-bottom: 58px;
  }
}