:root {
  --bg: #ffffff;
  --fg: #1a1d21;
  --muted: #5c6570;
  --accent: #0b6bcb;
  --border: #e2e6ea;
  --card: #f6f8fa;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
main { max-width: 860px; margin: 0 auto; padding: 1rem 1.25rem 3rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.7rem; margin: 1rem 0 .5rem; }
h2 { font-size: 1.25rem; margin-top: 2rem; }
.lead { color: var(--muted); font-size: 1.05rem; }

.site-header {
  display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap;
  padding: .75rem 1.25rem; border-bottom: 1px solid var(--border);
}
.site-header .logo { font-weight: 700; color: var(--fg); font-size: 1.1rem; }
.site-header nav { display: flex; gap: .9rem; flex-wrap: wrap; }
.site-footer {
  border-top: 1px solid var(--border); margin-top: 2rem;
  padding: 1rem 1.25rem; color: var(--muted); font-size: .85rem;
}
.breadcrumbs { font-size: .85rem; color: var(--muted); margin-top: 1rem; }

table.specs, table.listing { border-collapse: collapse; width: 100%; margin: 1rem 0; }
table.specs th, table.specs td, table.listing th, table.listing td {
  text-align: left; padding: .45rem .6rem; border-bottom: 1px solid var(--border);
}
table.specs th { width: 40%; font-weight: 600; color: var(--muted); }

.stat-grid { display: flex; gap: .75rem; flex-wrap: wrap; margin: 1rem 0; }
.stat {
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: .75rem 1.1rem; color: var(--fg);
}
.stat strong { font-size: 1.3rem; display: block; }

.calc {
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 1rem; margin: 1rem 0; max-width: 480px;
}
.calc label { display: block; font-size: .85rem; color: var(--muted); margin-top: .6rem; }
.calc input {
  width: 100%; padding: .45rem .6rem; font: inherit;
  border: 1px solid var(--border); border-radius: 6px;
}
.calc .result {
  margin-top: 1rem; font-size: 1.1rem; font-weight: 600;
  font-family: var(--mono);
}
.calc .note { font-size: .8rem; color: var(--muted); margin-top: .5rem; }
.related ul { padding-left: 1.2rem; }

img.product {
  max-width: 380px; width: 100%; height: auto; display: block;
  border: 1px solid var(--border); border-radius: 8px;
  margin: .5rem 0 1rem; background: #fff;
}
.filters { display: flex; gap: .6rem; flex-wrap: wrap; margin: 1rem 0; }
.filters input, .filters select {
  padding: .45rem .6rem; font: inherit;
  border: 1px solid var(--border); border-radius: 6px;
}
.hub-links { color: var(--muted); }

/* wide tables scroll horizontally on narrow screens instead of clipping */
@media (max-width: 720px) {
  table.listing, table.specs { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}

p.insight {
  background: var(--card); border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0; padding: .6rem .9rem; color: var(--fg);
  font-size: .95rem;
}