:root {
  --green-600: #0F6E56;
  --green-700: #0B5845;
  --green-50: #E1F5EE;
  --green-100: #D7F0E6;
  --ink: #1A1A1A;
  --muted: #5F5E5A;
  --hint: #888780;
  --line: #E5E3DC;
  --surface: #F7F6F2;
  --white: #FFFFFF;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

img { max-width: 100%; display: block; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--white);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 16px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 7px;
  background: var(--green-600);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.5px;
}

.brand-sub {
  font-weight: 400;
  color: var(--muted);
  font-size: 13px;
}

.nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
}

.nav a {
  color: var(--muted);
  transition: color .15s;
}

.nav a:hover,
.nav a.active { color: var(--green-600); }

.nav-cta {
  background: var(--green-600);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-weight: 500;
}

.nav-cta:hover { background: var(--green-700); color: #fff !important; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-size: 14px;
  padding: 11px 22px;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background .15s, transform .05s;
}

.btn-primary { background: var(--green-600); color: #fff; }
.btn-primary:hover { background: var(--green-700); }
.btn-ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--green-600); color: var(--green-600); }

/* ---------- Hero ---------- */
.hero { padding: 72px 0 56px; }

.hero-eyebrow {
  color: var(--green-600);
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 14px;
  letter-spacing: 0.3px;
}

.hero h1 {
  font-size: 40px;
  line-height: 1.2;
  font-weight: 700;
  margin: 0 0 16px;
  max-width: 640px;
  letter-spacing: -0.5px;
}

.hero p {
  font-size: 16px;
  color: var(--muted);
  margin: 0 0 28px;
  max-width: 560px;
}

.hero-actions { display: flex; gap: 12px; }

/* ---------- Stat strip ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 0 0 64px;
}

.stat {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 20px;
  text-align: center;
}

.stat-value { font-size: 26px; font-weight: 700; margin: 0 0 4px; }
.stat-label { font-size: 13px; color: var(--muted); margin: 0; }

/* ---------- Section ---------- */
.section { padding: 32px 0 64px; }
.section-title { font-size: 26px; font-weight: 700; margin: 0 0 6px; letter-spacing: -0.3px; }
.section-sub { font-size: 15px; color: var(--muted); margin: 0 0 28px; }

/* ---------- Product grid ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.product-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color .15s, transform .1s;
}

.product-card:hover { border-color: var(--green-600); }
.product-card.featured { border-color: var(--green-600); box-shadow: 0 0 0 1px var(--green-600); }

.product-card h3 { font-size: 17px; font-weight: 600; margin: 0 0 8px; }
.product-card p { font-size: 14px; color: var(--muted); margin: 0 0 14px; }

.tag {
  display: inline-block;
  font-size: 12px;
  color: var(--green-600);
  font-weight: 600;
}

.card-link {
  display: inline-block;
  font-size: 14px;
  color: var(--green-600);
  font-weight: 500;
  margin-top: 6px;
}

/* ---------- Applications ---------- */
.apps {
  background: var(--surface);
  padding: 48px 0;
  margin-bottom: 64px;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.app-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 20px;
}

.app-card h4 { font-size: 15px; font-weight: 600; margin: 0 0 4px; }
.app-card p { font-size: 13px; color: var(--muted); margin: 0; }

/* ---------- Why ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.why-item { display: flex; gap: 12px; align-items: flex-start; }
.why-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green-600);
  margin-top: 6px;
  flex-shrink: 0;
}
.why-item h4 { font-size: 15px; font-weight: 600; margin: 0 0 4px; }
.why-item p { font-size: 14px; color: var(--muted); margin: 0; }

/* ---------- CTA ---------- */
.cta {
  background: var(--green-600);
  padding: 56px 0;
  text-align: center;
  color: #fff;
}

.cta h2 { font-size: 28px; font-weight: 700; margin: 0 0 10px; }
.cta p { font-size: 15px; color: var(--green-100); margin: 0 0 24px; }
.cta .btn-white {
  background: #fff;
  color: var(--green-600);
  padding: 12px 26px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  display: inline-block;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 20px 0;
  font-size: 13px;
  color: var(--muted);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  padding: 56px 0 24px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
}

.page-hero h1 { font-size: 32px; font-weight: 700; margin: 0 0 8px; letter-spacing: -0.4px; }
.page-hero p { font-size: 15px; color: var(--muted); margin: 0; max-width: 560px; }

/* ---------- Spec table ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th, .spec-table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
}
.spec-table th {
  background: var(--surface);
  font-weight: 600;
  color: var(--muted);
  font-size: 13px;
}
.spec-table td:last-child { color: var(--muted); }

/* ---------- Form ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13px; font-weight: 600; }
.form-field input, .form-field textarea, .form-field select {
  font-family: inherit;
  font-size: 14px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color .15s;
}
.form-field input:focus, .form-field textarea:focus, .form-field select:focus { border-color: var(--green-600); }
.form-field textarea { resize: vertical; min-height: 120px; }

/* ---------- Disclaimer ---------- */
.disclaimer {
  font-size: 12px;
  color: var(--hint);
  line-height: 1.5;
  margin-top: 16px;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero h1 { font-size: 30px; }
  .stat-strip, .app-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid, .why-grid, .form-grid { grid-template-columns: 1fr; }
  .nav { gap: 14px; font-size: 13px; }
  .nav a.nav-cta { display: none; }
}