:root {
  color-scheme: light;
  --bg: #f7f9fb;
  --panel: #ffffff;
  --panel-soft: #edf6f7;
  --text: #17202a;
  --muted: #5d6b78;
  --line: #d9e3e8;
  --accent: #16889a;
  --accent-strong: #0a6375;
  --accent-soft: #cceef1;
  --ink: #10212c;
  --shadow: 0 18px 48px rgba(17, 44, 55, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, 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: 24px;
  min-height: 72px;
  padding: 0 7vw;
  background: rgba(247, 249, 251, 0.92);
  border-bottom: 1px solid rgba(217, 227, 232, 0.8);
  backdrop-filter: blur(14px);
}

.brand,
.site-nav {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: #e7fbff;
  font-weight: 800;
}

.site-nav {
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a {
  padding: 8px 0;
}

.site-nav a:hover {
  color: var(--accent-strong);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 54px;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: 70px 7vw 82px;
}

.hero-copy h1 {
  max-width: 780px;
  margin: 0;
  color: var(--ink);
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero-copy p {
  max-width: 660px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
}

.primary-link {
  background: var(--accent);
  color: #ffffff;
}

.secondary-link {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
}

.hero-panel {
  position: relative;
  min-height: 440px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(204, 238, 241, 0.82), rgba(255, 255, 255, 0.92)),
    radial-gradient(circle at 74% 18%, rgba(22, 136, 154, 0.24), transparent 32%);
  box-shadow: var(--shadow);
}

.signal-grid {
  position: absolute;
  inset: 34px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  opacity: 0.88;
}

.signal-grid span {
  min-height: 72px;
  border: 1px solid rgba(22, 136, 154, 0.25);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.56);
}

.signal-grid span:nth-child(3n) {
  background: rgba(22, 136, 154, 0.14);
}

.hero-card {
  position: absolute;
  right: 34px;
  bottom: 34px;
  left: 34px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 20px 50px rgba(16, 33, 44, 0.12);
}

.hero-card-mark {
  display: grid;
  width: 72px;
  height: 72px;
  flex: 0 0 72px;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: #e7fbff;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 0;
}

.hero-card strong {
  display: block;
  color: var(--ink);
  font-size: 20px;
}

.hero-card p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding: 78px 7vw;
  border-top: 1px solid var(--line);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 30px;
}

.section-heading h2,
.about-section h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-heading p,
.about-section p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.knowledge-grid article,
.case-card,
.metrics div,
.contact-box {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.knowledge-grid article {
  padding: 24px;
}

.knowledge-grid h3,
.case-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 19px;
}

.knowledge-grid p,
.case-card p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.split-section {
  background: #ffffff;
}

.case-list {
  display: grid;
  grid-template-columns: 1.1fr 0.95fr 0.95fr;
  gap: 16px;
}

.case-card {
  padding: 24px;
}

.case-card.featured {
  background: var(--panel-soft);
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 22px;
}

.metrics div {
  padding: 24px;
}

.metrics strong {
  display: block;
  color: var(--accent-strong);
  font-size: 30px;
  line-height: 1.1;
}

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

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

th,
td {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: 15px;
}

th {
  color: var(--ink);
  background: #eef6f8;
  font-weight: 700;
}

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

tbody tr:last-child td {
  border-bottom: 0;
}

.about-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
  background: #10212c;
  color: #ffffff;
}

.about-section h2,
.about-section p {
  color: #ffffff;
}

.about-section p {
  opacity: 0.82;
}

.contact-box {
  padding: 24px;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.contact-box span {
  display: block;
  color: #aeeef7;
  font-size: 13px;
}

.contact-box strong {
  display: block;
  margin-top: 8px;
  font-size: 21px;
}

.contact-box p {
  margin-top: 10px;
  font-size: 14px;
}

.site-footer {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 7vw;
  color: var(--muted);
  background: #ffffff;
  font-size: 14px;
}

.site-footer .icp-link {
  color: var(--muted);
}

.site-footer .icp-link:hover {
  color: var(--accent-strong);
}

@media (max-width: 980px) {
  .site-header,
  .hero,
  .section,
  .site-footer {
    padding-right: 5vw;
    padding-left: 5vw;
  }

  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding-top: 18px;
    padding-bottom: 18px;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 14px 18px;
  }

  .hero,
  .about-section {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 54px;
  }

  .knowledge-grid,
  .case-list,
  .metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .brand {
    white-space: normal;
  }

  .hero {
    gap: 34px;
  }

  .hero-copy h1 {
    font-size: 38px;
  }

  .hero-copy p {
    font-size: 16px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-link,
  .secondary-link {
    width: 100%;
  }

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

  .signal-grid {
    inset: 20px;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }

  .signal-grid span {
    min-height: 52px;
  }

  .hero-card {
    right: 20px;
    bottom: 20px;
    left: 20px;
  }

  .knowledge-grid,
  .case-list,
  .metrics {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}