:root {
  --green: #15ac94;
  --green-dark: #087c72;
  --ink: #1f2b35;
  --muted: #6e7b86;
  --line: #dfe6e9;
  --surface: #ffffff;
  --soft: #f5f8f7;
  --sky: #436fd6;
  --coral: #ef8256;
  --amber: #f6ad46;
  --footer: #27323f;
  --footer-muted: #9ba8b4;
  --max: 1120px;
  font-family:
    Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: var(--surface);
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  line-height: 1.7;
  background: var(--surface);
}

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

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 24px clamp(20px, 5vw, 72px);
  color: #fff;
  transition:
    background-color 180ms ease,
    box-shadow 180ms ease,
    padding 180ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  padding-top: 14px;
  padding-bottom: 14px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 12px 32px rgba(24, 43, 54, 0.08);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-mark {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 8px;
  font-size: 18px;
  line-height: 1;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(24px, 4vw, 58px);
  font-size: 15px;
}

.site-nav a {
  position: relative;
  white-space: nowrap;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -8px;
  left: 0;
  height: 2px;
  content: "";
  background: currentColor;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 160ms ease;
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  color: inherit;
  border: 1px solid currentColor;
  border-radius: 8px;
  background: transparent;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.hero {
  position: relative;
  display: grid;
  min-height: min(720px, 86vh);
  place-items: center;
  padding: 112px 24px 86px;
  overflow: hidden;
  color: #fff;
  background:
    linear-gradient(rgba(16, 30, 40, 0.38), rgba(16, 30, 40, 0.44)),
    url("assets/hero-communication.png") center / cover no-repeat;
}

.hero::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 140px;
  content: "";
  background: linear-gradient(rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.16));
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0.16;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(920px, 100%);
  text-align: center;
}

.hero-kicker {
  margin: 0 0 16px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.82);
  letter-spacing: 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(56px, 9vw, 108px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-tagline {
  max-width: 760px;
  margin: 22px auto 0;
  font-size: clamp(21px, 3vw, 36px);
  font-weight: 300;
  line-height: 1.42;
}

.hero-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 146px;
  min-height: 46px;
  margin-top: 38px;
  padding: 10px 28px;
  border: 2px solid rgba(255, 255, 255, 0.9);
  border-radius: 999px;
  color: #fff;
  font-size: 15px;
  transition:
    color 160ms ease,
    background-color 160ms ease,
    transform 160ms ease;
}

.hero-action:hover,
.hero-action:focus-visible {
  color: var(--green-dark);
  background: #fff;
  transform: translateY(-2px);
}

.trust-strip {
  padding: 0 24px;
  background:
    radial-gradient(circle at 1px 1px, rgba(37, 70, 81, 0.13) 1px, transparent 0) 0 0 / 18px 18px,
    var(--soft);
}

.trust-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: 940px;
  margin: -50px auto 0;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.68);
  box-shadow: 0 20px 50px rgba(35, 67, 77, 0.11);
}

.trust-inner div {
  position: relative;
  z-index: 2;
  min-height: 116px;
  padding: 28px 32px;
  background: #fff;
}

.trust-inner strong {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
  font-weight: 500;
}

.trust-inner span {
  color: var(--muted);
  font-size: 15px;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 118px 24px;
}

.section-heading {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.section-label {
  display: inline-block;
  margin-bottom: 14px;
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.section h2,
.feature-copy h2,
.vision-inner h2 {
  margin: 0;
  font-size: clamp(30px, 4.4vw, 48px);
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: 0;
}

.feature-copy h2 {
  font-size: clamp(30px, 3.4vw, 42px);
}

.section-heading p,
.feature-copy p,
.split-layout p,
.vision-inner p,
.site-footer p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.phone-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(28px, 5vw, 60px);
  align-items: end;
  margin-top: 70px;
}

.phone-gallery figure {
  margin: 0;
  text-align: center;
}

.phone-gallery img {
  width: min(100%, 260px);
  margin: 0 auto;
  filter: drop-shadow(0 26px 36px rgba(25, 41, 50, 0.14));
}

.phone-gallery figcaption {
  margin-top: 18px;
  color: var(--muted);
  font-size: 15px;
}

.feature-band {
  padding: 110px 24px;
  color: #fff;
  background:
    radial-gradient(circle at 1px 1px, rgba(8, 92, 82, 0.24) 1px, transparent 0) 0 0 / 18px 18px,
    linear-gradient(135deg, #16b99f, #0f927f);
}

.feature-band .section-label {
  color: rgba(255, 255, 255, 0.78);
}

.feature-band-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.45fr;
  gap: clamp(40px, 7vw, 86px);
  align-items: start;
  max-width: var(--max);
  margin: 0 auto;
}

.feature-copy {
  position: sticky;
  top: 110px;
  padding-top: 16px;
}

.feature-copy p {
  color: rgba(255, 255, 255, 0.82);
}

.feature-grid {
  display: grid;
  gap: 22px;
}

.feature-card {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 26px;
  align-items: center;
  padding: 22px;
  border-radius: 8px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 22px 45px rgba(7, 78, 70, 0.18);
}

.feature-card img {
  width: 210px;
  border-radius: 8px;
}

.feature-card h3 {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 500;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.company-section {
  padding-top: 122px;
  padding-bottom: 122px;
}

.split-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(38px, 7vw, 90px);
  align-items: start;
}

.split-layout p {
  margin-top: 38px;
  font-size: 17px;
}

.vision-section {
  padding: 110px 24px 124px;
  background:
    linear-gradient(rgba(245, 248, 247, 0.92), rgba(245, 248, 247, 0.92)),
    radial-gradient(circle at 1px 1px, rgba(31, 43, 53, 0.12) 1px, transparent 0) 0 0 / 18px 18px;
}

.vision-inner {
  max-width: 880px;
  margin: 0 auto;
  text-align: center;
}

.vision-inner p {
  max-width: 760px;
  margin-right: auto;
  margin-left: auto;
  font-size: 17px;
}

.site-footer {
  padding: 68px clamp(24px, 5vw, 72px) 34px;
  color: #fff;
  background: var(--footer);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.7fr 0.7fr 1fr;
  gap: clamp(26px, 6vw, 74px);
  max-width: var(--max);
  margin: 0 auto;
}

.footer-brand {
  margin-bottom: 16px;
}

.site-footer h2 {
  margin: 0 0 18px;
  font-size: 16px;
  font-weight: 500;
}

.site-footer a,
.site-footer p {
  display: block;
  color: var(--footer-muted);
  font-size: 14px;
}

.site-footer a + a,
.site-footer p + p {
  margin-top: 11px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--max);
  margin: 54px auto 0;
  padding-top: 24px;
  color: var(--footer-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 13px;
  line-height: 1;
}

.footer-bottom > span {
  display: inline-flex;
  align-items: center;
  min-height: 18px;
}

.footer-beian {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  justify-content: flex-end;
  line-height: 1;
}

.footer-beian a {
  display: inline-flex;
  align-items: center;
  min-height: 18px;
  color: var(--footer-muted);
  font-size: 12px;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  opacity: 0.82;
  transition:
    color 0.2s ease,
    opacity 0.2s ease;
}

.footer-beian a + a {
  margin-top: 0;
}

.footer-beian a:hover {
  color: #fff;
  opacity: 1;
}

.beian-police {
  gap: 6px;
}

.beian-police img {
  width: 13px;
  height: 13px;
  display: block;
  opacity: 0.72;
  transform: translateY(-0.5px);
}

@media (max-width: 860px) {
  .site-header {
    padding: 16px 20px;
  }

  .nav-toggle {
    display: inline-block;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 16px;
    left: 16px;
    display: none;
    grid-template-columns: 1fr;
    gap: 0;
    overflow: hidden;
    color: var(--ink);
    border: 1px solid rgba(31, 43, 53, 0.08);
    border-radius: 8px;
    background: #fff;
    box-shadow: 0 18px 36px rgba(24, 43, 54, 0.14);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    padding: 14px 18px;
    border-bottom: 1px solid rgba(31, 43, 53, 0.08);
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    min-height: 76vh;
    padding-top: 96px;
    padding-bottom: 72px;
  }

  .trust-inner,
  .phone-gallery,
  .feature-band-inner,
  .split-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .trust-inner {
    max-width: 520px;
  }

  .section {
    padding-top: 88px;
    padding-bottom: 88px;
  }

  .phone-gallery {
    max-width: 420px;
    margin-right: auto;
    margin-left: auto;
  }

  .feature-copy {
    position: static;
    padding-top: 0;
  }

  .feature-card {
    grid-template-columns: 170px 1fr;
  }

  .feature-card img {
    width: 170px;
  }

  .split-layout p {
    margin-top: 0;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .footer-beian {
    justify-content: flex-start;
    gap: 7px 14px;
  }
}

@media (max-width: 560px) {
  .brand {
    font-size: 15px;
  }

  .brand-mark {
    width: 31px;
    height: 31px;
    font-size: 16px;
  }

  .hero {
    min-height: 78vh;
    padding-right: 18px;
    padding-left: 18px;
  }

  .hero-kicker {
    font-size: 14px;
  }

  .hero-action {
    min-width: 132px;
  }

  .trust-strip {
    padding-right: 18px;
    padding-left: 18px;
  }

  .trust-inner {
    margin-top: -36px;
  }

  .trust-inner div {
    min-height: 96px;
    padding: 22px 24px;
  }

  .section,
  .feature-band,
  .vision-section {
    padding-right: 18px;
    padding-left: 18px;
  }

  .feature-card {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .feature-card img {
    width: 100%;
    max-width: 320px;
  }

  .site-footer {
    padding-right: 20px;
    padding-left: 20px;
  }
}