:root {
  color-scheme: light;
  --ink: #1f2925;
  --muted: #65756d;
  --line: #dce5df;
  --paper: #fbfcf8;
  --wash: #f0f5f1;
  --green: #2f7d65;
  --green-dark: #245f50;
  --gold: #c49344;
  --white: #ffffff;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

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;
  padding: 18px clamp(20px, 5vw, 72px);
  background: rgba(251, 252, 248, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  white-space: nowrap;
}

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

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 22px;
  color: var(--muted);
  font-size: 15px;
}

nav a:hover {
  color: var(--green);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.9fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  min-height: calc(100vh - 74px);
  padding: clamp(56px, 8vw, 104px) clamp(20px, 5vw, 72px) 46px;
}

.page-hero {
  padding: clamp(64px, 9vw, 112px) clamp(20px, 5vw, 72px);
  background: var(--wash);
}

.page-hero h1 {
  margin-bottom: 22px;
}

.about-content {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.85fr);
  gap: clamp(28px, 6vw, 72px);
}

.text-stack p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
}

.text-stack p:last-child {
  margin-bottom: 0;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--green);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
}

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

h1 {
  max-width: 780px;
  margin-bottom: 22px;
  font-size: clamp(38px, 7vw, 72px);
  line-height: 1.08;
  letter-spacing: 0;
}

.intro {
  max-width: 690px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 700;
}

.primary-action {
  background: var(--green);
  color: var(--white);
}

.primary-action:hover {
  background: var(--green-dark);
}

.secondary-action {
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--green-dark);
}

.hero-visual {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(145deg, #ffffff, #edf3ef);
  box-shadow: 0 24px 70px rgba(31, 41, 37, 0.12);
}

.hero-visual svg {
  display: block;
  width: 100%;
  height: auto;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0 clamp(20px, 5vw, 72px);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.stats div {
  padding: 24px;
  background: var(--white);
}

.stats strong {
  display: block;
  margin-bottom: 6px;
  color: var(--green-dark);
  font-size: clamp(24px, 3vw, 34px);
}

.stats span {
  color: var(--muted);
}

.section {
  padding: clamp(64px, 9vw, 112px) clamp(20px, 5vw, 72px);
}

.section h2 {
  max-width: 760px;
  margin-bottom: 28px;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}

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

.feature-grid article {
  min-height: 210px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature-grid h3 {
  margin-bottom: 14px;
  font-size: 22px;
}

.feature-grid p,
.band p,
footer p {
  color: var(--muted);
  line-height: 1.8;
}

.band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 0.8fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: start;
  background: var(--wash);
}

.band p {
  max-width: 650px;
  margin-bottom: 0;
  font-size: 18px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: center;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.pill-list span {
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--green-dark);
  font-weight: 700;
}

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 28px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  background: #f7f9f5;
}

footer p {
  margin: 0;
}

@media (max-width: 860px) {
  .site-header,
  .hero,
  .about-content,
  .band,
  .split {
    display: block;
  }

  .site-header {
    position: static;
  }

  nav {
    margin-top: 14px;
    justify-content: flex-start;
  }

  .hero {
    min-height: auto;
  }

  .hero-visual {
    margin-top: 38px;
  }

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

  .band p,
  .pill-list {
    margin-top: 22px;
  }
}

@media (max-width: 520px) {
  .site-header {
    padding-top: 16px;
  }

  .brand {
    white-space: normal;
  }

  h1 {
    font-size: 36px;
  }

  .intro,
  .band p {
    font-size: 16px;
  }

  .hero-actions a {
    width: 100%;
  }

  .feature-grid article {
    min-height: auto;
  }
}