*, *::before, *::after { box-sizing: border-box; }

:root {
  --text: #111;
  --muted: #555;
  --bg: #fff;
  --line: #e5e5e5;
  --max: 960px;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.site-header .inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-header nav { display: flex; gap: 24px; }

.site-header nav a {
  text-decoration: none;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.site-header nav a[aria-current="page"] { text-decoration: underline; }

.brand { font-weight: 700; text-decoration: none; }

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 48px 16px 64px;
}

.intro { max-width: 560px; margin: 0 auto; }

h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 16px; }

.products { display: grid; gap: 48px; margin-top: 48px; }

.product {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.product img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.product h2 { font-size: 1.8rem; margin: 0 0 8px; }
.product p { margin: 0; color: var(--muted); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 16px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}

@media (max-width: 640px) {
  .site-header .inner { flex-direction: column-reverse; }
  .product { grid-template-columns: 1fr; gap: 16px; }
  .product h2 { font-size: 1.4rem; }
}