:root {
  --brand: #2E8B57;
  --brand-dark: #1F6B43;
  --brand-tint: #E8F3EC;
  --ink: #111827;
  --ink-muted: #6B7280;
  --surface: #FFFFFF;
  --page: #F9FAFB;
  --border: #E5E7EB;
  --radius: 12px;
  --maxw: 1200px;
  --font: Inter, "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--page); line-height: 1.6; }
main { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
a { color: var(--brand-dark); }

.site-header { display: flex; align-items: center; gap: 24px; max-width: var(--maxw); margin: 0 auto; padding: 16px 20px; }
.brand { display: flex; align-items: center; font-weight: 700; color: var(--brand-dark); text-decoration: none; }
.brand img { height: 38px; width: auto; display: block; }
.main-nav { display: flex; gap: 18px; margin-left: auto; }
.lang-switch { display: flex; gap: 10px; font-size: 0.85rem; }
.btn { display: inline-block; padding: 10px 18px; border-radius: var(--radius); text-decoration: none; border: 1px solid var(--border); }
.btn-primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.btn-primary:hover { background: var(--brand-dark); }

.hero { background: linear-gradient(160deg, var(--brand) 0%, var(--brand-dark) 100%); color: #fff; padding: 72px 0; }
.hero h1 { font-size: clamp(1.8rem, 4vw, 3rem); margin: 0 0 16px; }
.hero .btn { background: transparent; color: #fff; border-color: rgba(255, 255, 255, 0.7); }
.hero .btn:hover { background: rgba(255, 255, 255, 0.12); }
.series-grid, .product-grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); padding: 32px 0; }
.product-card { background: var(--surface); border: 1px solid var(--brand-tint); border-radius: var(--radius); padding: 16px; }
.product-card img { width: 100%; height: auto; display: block; border-radius: calc(var(--radius) - 4px); background: #fff; }
.product-card .model { color: var(--ink-muted); font-size: 0.9rem; }
.spec-table { width: 100%; border-collapse: collapse; background: var(--surface); }
.spec-table th, .spec-table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); }
.spec-table th { width: 34%; color: var(--ink-muted); font-weight: 500; }
.page-head { padding: 40px 0 8px; }
.page-head p { color: var(--ink-muted); max-width: 70ch; }
.feature-band { padding: 24px 0; }
.breadcrumbs { padding: 16px 0; color: var(--ink-muted); font-size: 0.9rem; }
.product-detail { display: grid; gap: 32px; grid-template-columns: minmax(240px, 420px) 1fr; padding: 24px 0; }
.product-media img { width: 100%; height: auto; display: block; border-radius: var(--radius); background: #fff; }
.contact-grid { display: flex; flex-wrap: wrap; gap: 16px; padding: 24px 0; }
.inquiry-form { display: grid; gap: 16px; max-width: 640px; }
.inquiry-form label { display: grid; gap: 6px; font-weight: 600; }
.inquiry-form input, .inquiry-form select, .inquiry-form textarea { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font: inherit; font-weight: 400; }
.form-note { color: var(--ink-muted); font-size: 0.9rem; }
.cta-band { background: var(--brand-tint); border-radius: var(--radius); padding: 28px; margin: 40px 0; display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.site-footer { background: var(--brand-dark); color: #fff; margin-top: 60px; padding: 28px 20px; text-align: center; }

@media (max-width: 720px) {
  .site-header { flex-wrap: wrap; }
  .main-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    flex-wrap: wrap;
    gap: 8px 16px;
  }
  .lang-switch { flex-wrap: wrap; }
  .product-detail { grid-template-columns: 1fr; }
}