:root {
  --primary: #2563eb;
  --dark: #111827;
  --light: #f9fafb;
  --gray: #6b7280;
  --radius: 8px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, -apple-system, sans-serif; line-height: 1.6; color: var(--dark); }
a { text-decoration: none; color: inherit; }
.container { max-width: 1100px; margin: 0 auto; padding: 4rem 1.5rem; }
.bg-light { background: var(--light); }

header { background: #fff; box-shadow: 0 2px 8px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 10; }
nav { display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.5rem; max-width: 1100px; margin: 0 auto; }
.logo { font-weight: 700; font-size: 1.4rem; }
.nav-links { display: flex; gap: 1.5rem; list-style: none; }
.menu-btn { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; }

.hero { text-align: center; padding: 5rem 1.5rem; background: linear-gradient(135deg, #f0f4ff, #e0e7ff); }
.hero h1 { font-size: 2.5rem; margin-bottom: 0.5rem; }
.hero p { color: var(--gray); margin-bottom: 1.5rem; }

.btn, .btn-sm { display: inline-block; background: var(--primary); color: #fff; padding: 0.8rem 1.5rem; border-radius: var(--radius); font-weight: 500; transition: 0.2s; }
.btn:hover, .btn-sm:hover { background: #1d4ed8; }
.btn-sm { padding: 0.5rem 1rem; font-size: 0.9rem; }

.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.5rem; margin-top: 2rem; }
.card { background: #fff; padding: 1.5rem; border-radius: var(--radius); box-shadow: 0 2px 6px rgba(0,0,0,0.05); text-align: center; }
.card img { width: 100%; max-height: 200px; object-fit: contain; margin-bottom: 1rem; }

.warranty-form { display: grid; gap: 0.8rem; max-width: 500px; margin-top: 1.5rem; }
.warranty-form input, .warranty-form textarea { padding: 0.7rem; border: 1px solid #d1d5db; border-radius: var(--radius); font-family: inherit; }
.warranty-form textarea { min-height: 100px; }

footer { text-align: center; padding: 2rem 1rem; background: var(--dark); color: #fff; font-size: 0.9rem; }
footer a { color: #93c5fd; }

@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: #fff; padding: 1rem; box-shadow: 0 4px 6px rgba(0,0,0,0.05); }
  .nav-links.active { display: flex; }
  .menu-btn { display: block; }
  .hero h1 { font-size: 1.8rem; }
}