:root {
  --ink: #102126;
  --muted: #53676d;
  --line: #dce7e5;
  --paper: #f7faf8;
  --white: #ffffff;
  --teal: #0f766e;
  --teal-dark: #0b4f4a;
  --blue: #2563eb;
  --green: #1f8a4c;
  --amber: #d98716;
  --shadow: 0 18px 50px rgba(16, 33, 38, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

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

button,
input,
textarea {
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 250, 248, 0.86);
  border-bottom: 1px solid rgba(220, 231, 229, 0.8);
  backdrop-filter: blur(18px);
}

.nav {
  width: min(1180px, calc(100% - 48px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--teal), var(--blue));
  border-radius: 8px;
  font-weight: 800;
}

.brand strong {
  display: block;
  font-size: 17px;
  line-height: 1.15;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  color: #254047;
  font-size: 15px;
}

.nav-links a {
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--teal-dark);
  border-bottom-color: var(--teal);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  padding: 10px;
}

.menu-toggle span:not(.sr-only) {
  display: block;
  height: 2px;
  margin: 5px 0;
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: calc(82svh - 72px);
  display: flex;
  align-items: center;
  overflow: hidden;
  background-image: url("assets/hero-platform-v2.png");
  background-size: cover;
  background-position: center right;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(247, 250, 248, 0.98) 0%, rgba(247, 250, 248, 0.88) 34%, rgba(247, 250, 248, 0.28) 62%, rgba(16, 33, 38, 0.18) 100%),
    linear-gradient(180deg, rgba(247, 250, 248, 0.4), rgba(247, 250, 248, 0.12));
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 64px 0;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 800;
}

.hero h1 {
  max-width: 690px;
  margin: 0;
  font-size: 56px;
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 570px;
  margin: 24px 0 0;
  color: #30494f;
  font-size: 20px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 700;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

.button.primary {
  color: var(--white);
  background: var(--teal);
  box-shadow: 0 12px 24px rgba(15, 118, 110, 0.24);
}

.button.primary:hover,
.button.primary:focus-visible {
  background: var(--teal-dark);
}

.button.secondary {
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(15, 118, 110, 0.24);
}

.band {
  background: var(--white);
}

.section,
.band,
.contact {
  padding: 88px 0;
}

.section-inner {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.intro {
  padding: 44px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.intro-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
}

h2 {
  margin: 0;
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: 0;
}

.intro h2 {
  max-width: 680px;
}

.intro-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fbfdfc;
}

.intro-points div {
  min-height: 112px;
  padding: 20px;
  border-right: 1px solid var(--line);
}

.intro-points div:last-child {
  border-right: 0;
}

.intro-points strong {
  display: block;
  color: var(--amber);
  font-size: 18px;
}

.intro-points span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

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

.service-card {
  min-height: 276px;
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 8px 26px rgba(16, 33, 38, 0.06);
}

.service-card h3,
.solution-list h3 {
  margin: 22px 0 10px;
  font-size: 20px;
  line-height: 1.35;
}

.service-card p,
.solution-list p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.service-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  color: var(--teal);
  background: #e8f6f3;
  border-radius: 8px;
}

.service-icon svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.service-icon.amber {
  color: var(--amber);
  background: #fff4df;
}

.service-icon.green {
  color: var(--green);
  background: #e9f7ee;
}

.service-icon.blue {
  color: var(--blue);
  background: #eaf1ff;
}

.service-icon.purple {
  color: #7c3aed;
  background: #f0eafd;
}

.service-icon.cyan {
  color: #0891b2;
  background: #e6f7fb;
}

.solutions {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.solution-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.solution-list article {
  min-height: 250px;
  padding: 30px;
  background: #fbfdfc;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.solution-list span {
  color: var(--teal-dark);
  font-size: 14px;
  font-weight: 800;
}

.process-list {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.process-list li {
  min-height: 190px;
  padding: 28px;
  background: var(--white);
}

.process-list strong {
  display: block;
  margin-bottom: 12px;
  font-size: 19px;
}

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

.contact {
  color: var(--white);
  background:
    linear-gradient(110deg, rgba(11, 79, 74, 0.96), rgba(16, 33, 38, 0.94)),
    url("assets/hero-platform-v2.png") center right / cover;
}

.contact .section-kicker {
  color: #9ee7dd;
}

.contact-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.8fr;
  gap: 42px;
  align-items: center;
}

.contact h2 {
  max-width: 720px;
}

.contact-panel {
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
}

.contact-panel p {
  margin: 0 0 22px;
  font-size: 18px;
  font-weight: 800;
}

.contact-status {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  color: #d5fbf5;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 8px;
  font-weight: 700;
}

.contact-panel small {
  display: block;
  margin-top: 16px;
  color: rgba(255, 255, 255, 0.7);
}

.footer {
  width: min(1180px, calc(100% - 48px));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
}

.footer a:hover,
.footer a:focus-visible {
  color: var(--teal-dark);
}

@media (max-width: 980px) {
  .hero {
    min-height: 76svh;
    background-position: 58% center;
  }

  .hero-overlay {
    background: linear-gradient(90deg, rgba(247, 250, 248, 0.98), rgba(247, 250, 248, 0.74), rgba(247, 250, 248, 0.24));
  }

  .hero h1 {
    font-size: 42px;
  }

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

  .intro-grid,
  .contact-inner {
    grid-template-columns: 1fr;
  }

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

  .solution-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .nav {
    width: min(100% - 32px, 1180px);
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px;
  }

  .hero {
    min-height: 74svh;
    background-position: 66% center;
  }

  .hero-overlay {
    background: linear-gradient(180deg, rgba(247, 250, 248, 0.98), rgba(247, 250, 248, 0.86), rgba(247, 250, 248, 0.46));
  }

  .hero-content,
  .section-inner,
  .footer {
    width: min(100% - 32px, 1180px);
  }

  .hero-content {
    padding: 48px 0;
  }

  .hero h1 {
    max-width: 420px;
    font-size: 32px;
  }

  .hero-copy {
    max-width: 420px;
    font-size: 17px;
  }

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

  .section,
  .band,
  .contact {
    padding: 64px 0;
  }

  .intro {
    padding: 34px 0;
  }

  h2 {
    font-size: 27px;
  }

  .intro-points,
  .service-grid,
  .solution-list,
  .process-list {
    grid-template-columns: 1fr;
  }

  .intro-points div {
    min-height: 94px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .intro-points div:last-child {
    border-bottom: 0;
  }

  .service-card,
  .solution-list article,
  .process-list li {
    min-height: auto;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 18px 0;
  }
}