:root {
  --bg: #f6f7f2;
  --paper: #ffffff;
  --ink: #172019;
  --muted: #667167;
  --line: #dfe5dc;
  --green: #2f6b49;
  --green-dark: #1f4b34;
  --green-soft: #e7efe8;
  --warm: #efe8dc;
  --dark: #18251d;
  --shadow: 0 18px 50px rgba(30, 58, 40, 0.08);
  --radius: 22px;
  --shell: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid rgba(47, 107, 73, 0.08);
}
.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--green);
  color: #fff;
  font-weight: 800;
}
.brand strong { display: block; font-size: 17px; line-height: 1.15; }
.brand small { display: block; margin-top: 3px; color: var(--muted); font-size: 11px; letter-spacing: .04em; }
.main-nav { display: flex; align-items: center; gap: 22px; font-size: 14px; }
.main-nav a { color: #4c574e; }
.main-nav a:hover { color: var(--green); }
.menu-toggle { display: none; border: 0; background: var(--paper); border-radius: 10px; padding: 8px 12px; }

.hero {
  min-height: 610px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr);
  gap: 72px;
  align-items: center;
  padding-top: 76px;
  padding-bottom: 76px;
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-weight: 800;
  font-size: 12px;
  letter-spacing: .14em;
}
.hero h1,
.section-heading h2 {
  margin: 0;
  letter-spacing: -.04em;
  line-height: 1.08;
}
.hero h1 { font-size: clamp(46px, 7vw, 80px); max-width: 800px; }
.hero-lead { max-width: 690px; margin: 28px 0 0; color: var(--muted); font-size: 19px; line-height: 1.8; }
.hero-actions { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }
.btn { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 0 22px; border-radius: 14px; font-weight: 700; }
.btn-primary { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); }
.btn-secondary { background: var(--paper); border: 1px solid var(--line); }
.hero-meta { display: flex; gap: 10px; margin-top: 28px; flex-wrap: wrap; }
.hero-meta span { border: 1px solid var(--line); border-radius: 999px; padding: 6px 10px; color: var(--muted); font-size: 12px; background: rgba(255,255,255,.5); }
.hero-card { position: relative; overflow: hidden; min-height: 360px; padding: 34px; border-radius: 30px; background: var(--dark); color: #fff; box-shadow: var(--shadow); }
.hero-card::after { content: "叶"; position: absolute; right: -24px; bottom: -82px; font-size: 220px; font-weight: 900; color: rgba(255,255,255,.045); line-height: 1; }
.hero-card-label { margin: 0 0 44px; font-size: 12px; letter-spacing: .14em; color: #b6c8ba; }
.hero-card blockquote { margin: 0; max-width: 430px; font-size: 30px; line-height: 1.45; font-weight: 750; letter-spacing: -.025em; }
.hero-card > p:last-child { margin: 28px 0 0; color: #bdc9c0; }

.section { padding: 88px 0; }
.section-soft { background: #eef1eb; }
.section-dark { background: var(--dark); color: #fff; padding: 94px 0; }
.section-heading { display: flex; justify-content: space-between; gap: 40px; align-items: end; margin-bottom: 36px; }
.section-heading.compact { margin-bottom: 28px; }
.section-heading h2 { font-size: clamp(32px, 5vw, 50px); }
.section-heading > p { max-width: 540px; margin: 0; color: var(--muted); }
.section-heading.light > p { color: #b9c8bc; }
.section-heading.light .eyebrow { color: #a9ceb5; }

.product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.product-card { min-height: 315px; display: flex; flex-direction: column; padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper); box-shadow: 0 3px 16px rgba(30, 50, 36, .025); transition: transform .18s ease, box-shadow .18s ease; }
.product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.card-top { display: flex; justify-content: space-between; align-items: start; gap: 12px; }
.status { display: inline-flex; align-items: center; min-height: 27px; padding: 0 9px; border-radius: 999px; font-size: 11px; font-weight: 800; letter-spacing: .04em; background: var(--green-soft); color: var(--green-dark); }
.status.beta { background: #e8eef7; color: #395d85; }
.status.building { background: #f2eadc; color: #825f2f; }
.status.research { background: #ece7f4; color: #66517f; }
.product-type { color: var(--muted); font-size: 12px; }
.product-card h3 { margin: 25px 0 9px; font-size: 24px; line-height: 1.25; letter-spacing: -.025em; }
.product-card .price { margin: 0 0 8px; color: var(--green); font-size: 17px; font-weight: 800; }
.product-card .summary { margin: 0; color: var(--muted); }
.product-card .note { margin: 12px 0 0; padding: 10px 12px; border-radius: 10px; background: #f5f6f2; color: #788178; font-size: 12px; }
.card-bottom { margin-top: auto; padding-top: 25px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.card-bottom a { color: var(--green); font-weight: 800; font-size: 14px; }
.card-category { color: #869087; font-size: 12px; }

.category-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.category-card { min-height: 245px; padding: 25px; border-radius: var(--radius); background: var(--paper); border: 1px solid transparent; transition: border-color .18s ease, transform .18s ease; }
.category-card:hover { transform: translateY(-3px); border-color: #cbd8cc; }
.category-index { color: var(--green); font-weight: 800; font-size: 12px; }
.category-card h3 { margin: 60px 0 10px; font-size: 23px; }
.category-card p { margin: 0; color: var(--muted); font-size: 14px; }

.lab-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.lab-card { min-height: 230px; padding: 25px; border-radius: 20px; border: 1px solid rgba(255,255,255,.12); background: rgba(255,255,255,.04); }
.lab-card .status { margin-bottom: 26px; }
.lab-card h3 { margin: 0 0 10px; font-size: 23px; }
.lab-card p { margin: 0; color: #b8c7bb; }
.lab-card small { display: block; margin-top: 20px; color: #84998a; }

.blog-placeholder { display: flex; justify-content: space-between; gap: 20px; align-items: center; padding: 28px 30px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--paper); }
.blog-placeholder span { color: var(--muted); }
.blog-placeholder strong { color: var(--green); }

.site-footer { padding: 48px 0 60px; border-top: 1px solid var(--line); }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; align-items: start; }
.footer-grid p { color: var(--muted); margin: 8px 0 0; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; justify-content: flex-end; font-size: 13px; color: var(--muted); }
.footer-links a:hover { color: var(--green); }

@media (max-width: 980px) {
  .main-nav { display: none; position: absolute; left: 20px; right: 20px; top: 66px; padding: 18px; background: var(--paper); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); flex-direction: column; align-items: stretch; }
  .main-nav.open { display: flex; }
  .menu-toggle { display: block; }
  .hero { grid-template-columns: 1fr; gap: 28px; min-height: auto; }
  .hero-card { min-height: 290px; }
  .product-grid, .lab-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .site-header .shell { width: min(calc(100% - 24px), var(--shell)); }
  .hero { padding-top: 50px; padding-bottom: 52px; }
  .hero h1 { font-size: 44px; }
  .hero-lead { font-size: 16px; }
  .hero-card { padding: 26px; }
  .hero-card blockquote { font-size: 25px; }
  .section { padding: 64px 0; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 14px; }
  .product-grid, .lab-grid, .category-grid { grid-template-columns: 1fr; }
  .product-card { min-height: 285px; }
  .blog-placeholder, .footer-grid { display: block; }
  .blog-placeholder strong { display: block; margin-top: 10px; }
  .footer-links { justify-content: flex-start; margin-top: 24px; }
}