:root {
  color-scheme: light;
  --bg: #f6f7f4;
  --surface: #ffffff;
  --surface-soft: #eef2ea;
  --ink: #17211b;
  --muted: #607064;
  --line: #dbe3d7;
  --brand: #236144;
  --brand-dark: #143d2c;
  --accent: #c99d4a;
  --shadow: 0 20px 60px rgba(24, 42, 31, 0.12);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}

a {
  color: inherit;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(246, 247, 244, 0.94);
  border-bottom: 1px solid var(--line);
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: var(--brand);
  font-weight: 900;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a {
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--brand-dark);
}

.hero {
  padding: 82px 0 70px;
  background:
    radial-gradient(circle at top left, rgba(35, 97, 68, 0.14), transparent 34%),
    linear-gradient(135deg, #f7f7f1 0%, #eef3eb 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  align-items: center;
  gap: 48px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--brand);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.lead {
  max-width: 680px;
  color: var(--muted);
  font-size: 18px;
}

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

.button {
  min-height: 44px;
  padding: 10px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}

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

.button.secondary {
  color: var(--brand-dark);
  background: #fff;
  border: 1px solid var(--line);
}

.panel,
.card,
.doc-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.summary-card {
  padding: 28px;
}

.summary-row {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.summary-row span {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}

.summary-row strong {
  font-size: 18px;
}

.summary-note {
  margin-top: 22px;
  padding: 16px;
  color: var(--brand-dark);
  background: var(--surface-soft);
  border-radius: 18px;
}

.section {
  padding: 72px 0;
}

.section-muted {
  background: #eef2ea;
}

.section-head {
  max-width: 720px;
  margin-bottom: 32px;
}

.section h2 {
  margin-bottom: 12px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.03em;
}

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

.card {
  padding: 24px;
}

.card h3,
.usecase h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.card p,
.usecase p,
.footer-grid p {
  color: var(--muted);
}

.usecase-list {
  display: grid;
  gap: 16px;
}

.usecase {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 20px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
}

.usecase span {
  width: 46px;
  height: 46px;
  display: inline-grid;
  place-items: center;
  border-radius: 14px;
  color: var(--brand-dark);
  background: #e7ddc3;
  font-weight: 900;
}

.doc-main {
  padding: 56px 0 72px;
}

.doc-card {
  max-width: 880px;
  padding: clamp(28px, 5vw, 56px);
}

.doc-card h1 {
  font-size: clamp(32px, 5vw, 48px);
}

.doc-card h2 {
  margin-top: 30px;
  font-size: 22px;
}

.doc-meta,
.doc-note {
  color: var(--muted);
}

.contact-list {
  display: grid;
  gap: 14px;
  margin: 28px 0;
}

.contact-list div {
  padding: 18px;
  background: var(--surface-soft);
  border-radius: 18px;
}

.contact-list span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.contact-list strong {
  display: block;
  margin-top: 4px;
}

.site-footer {
  padding: 38px 0;
  color: #dce8df;
  background: #13251b;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  gap: 28px;
}

.footer-brand {
  margin-bottom: 10px;
  color: #fff;
  font-size: 20px;
  font-weight: 800;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 14px 20px;
}

.footer-links a {
  color: #fff;
  text-decoration: none;
}

.record-note {
  font-size: 13px;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .hero {
    padding: 56px 0;
  }

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

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

  .footer-links {
    justify-content: flex-start;
  }
}

@media (max-width: 520px) {
  .container {
    width: min(100% - 28px, 1120px);
  }

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

  .hero-actions {
    flex-direction: column;
  }
}