:root {
  color-scheme: light;
  --bg: #f7f5ef;
  --ink: #1d2921;
  --muted: #667067;
  --line: #d9d7ce;
  --panel: #fffdf7;
  --primary: #497749;
  --primary-dark: #315833;
  --accent: #b6534f;
  --gold: #d6a94b;
  --blue: #5d7f9d;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

.site-header,
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 24px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgb(247 245 239 / 0.92);
  backdrop-filter: blur(12px);
}

.site-header nav,
.site-footer {
  color: var(--muted);
  font-size: 15px;
}

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

.site-header a,
.site-footer a {
  text-decoration: none;
}

.site-header a:hover,
.site-footer a:hover {
  color: var(--primary-dark);
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
}

.hero,
.section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 72px 24px;
}

.hero {
  display: flex;
  flex-direction: column;
  gap: 42px;
  min-height: calc(100vh - 88px);
  padding-top: 42px;
}

.hero-copy {
  max-width: 860px;
  padding-top: 4px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

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

h1 {
  max-width: 820px;
  margin-bottom: 20px;
  font-size: clamp(42px, 7vw, 76px);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 20px;
  margin-bottom: 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.actions.centered {
  justify-content: center;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  font-weight: 800;
  text-decoration: none;
}

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

.button.secondary {
  color: var(--primary-dark);
}

.hero-art {
  order: -1;
  width: 100%;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7f5ef;
}

.hero-art img {
  display: block;
  width: 100%;
  height: auto;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 18px;
}

.overview-grid,
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

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

.metric,
.feature,
.case-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.feature {
  min-height: 218px;
}

.metric span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.metric strong {
  display: block;
  margin-bottom: 12px;
  font-size: 24px;
  line-height: 1.2;
}

.metric p,
.feature p,
.case-card p,
.split p,
.policy p,
.policy li,
.scope-list {
  color: var(--muted);
}

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 40px;
}

.scope-list {
  margin: 0;
  padding-left: 22px;
}

.scope-list li + li {
  margin-top: 12px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-cloud span {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--primary-dark);
  font-weight: 800;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.policy {
  max-width: 860px;
  margin: 0 auto;
  padding: 64px 24px 88px;
}

.policy article {
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.policy h1 {
  font-size: clamp(34px, 5vw, 54px);
}

.policy h2 {
  margin-top: 36px;
  font-size: 24px;
}

.policy ul {
  padding-left: 22px;
}

.policy hr {
  margin: 38px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.updated {
  font-weight: 700;
}

@media (max-width: 860px) {
  .overview-grid,
  .case-grid,
  .split {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 32px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .site-header,
  .site-footer {
    padding: 16px;
  }

  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .site-header nav {
    gap: 12px;
  }

  .hero,
  .section,
  .policy {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero {
    min-height: 0;
  }

  .lead {
    font-size: 18px;
  }

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

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

  .metric,
  .feature,
  .case-card,
  .policy article {
    padding: 20px;
  }
}