/* Lintel product pages: five colour palette, 8px radius, ghost borders. */
:root {
  --tf-blue: #0052FF;
  --tf-tint: #EBF1FF;
  --tf-alert: #BF3003;
  --tf-ink: #0F172A;
  --tf-white: #FFFFFF;
  --tf-muted: color-mix(in srgb, var(--tf-ink) 68%, var(--tf-white));
  --tf-line: color-mix(in srgb, var(--tf-ink) 12%, var(--tf-white));
  --tf-radius: 8px;
  --tf-font: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', 'Segoe UI', Roboto, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--tf-font); color: var(--tf-ink); background: var(--tf-white); font-size: 16px; line-height: 1.65; }
a { color: var(--tf-blue); text-underline-offset: 2px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--tf-blue); outline-offset: 2px; border-radius: 4px; }
.skip-link { position: absolute; left: -9999px; top: 8px; background: var(--tf-ink); color: var(--tf-white); padding: 8px 12px; border-radius: var(--tf-radius); z-index: 10; }
.skip-link:focus { left: 8px; }
.shell { width: min(1040px, 100% - 48px); margin: 0 auto; }
.nav { border-bottom: 1px solid var(--tf-line); background: var(--tf-white); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; color: var(--tf-ink); text-decoration: none; font-size: 16px; }
.brand img { width: 32px; height: 32px; border-radius: var(--tf-radius); }
.nav-links { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; }
.nav-links a { display: block; padding: 6px 12px; border-radius: var(--tf-radius); color: var(--tf-ink); text-decoration: none; font-size: 14px; font-weight: 500; }
.nav-links a:hover { background: var(--tf-tint); }
.nav-links a[aria-current="page"] { background: var(--tf-tint); color: var(--tf-blue); }
.hero { background: var(--tf-tint); border-bottom: 1px solid var(--tf-line); padding: 56px 0 40px; }
.eyebrow { font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--tf-blue); margin: 0 0 8px; }
h1 { font-size: clamp(28px, 4vw, 40px); line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 12px; font-weight: 600; }
.lede { font-size: 18px; color: var(--tf-muted); margin: 0; max-width: 680px; }
.updated { font-size: 14px; color: var(--tf-muted); margin: 16px 0 0; }
.layout { display: grid; grid-template-columns: 220px 1fr; gap: 48px; padding: 40px 0 72px; }
.toc { position: sticky; top: 24px; align-self: start; font-size: 14px; }
.toc p { font-weight: 600; margin: 0 0 8px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--tf-line); }
.toc a { display: block; padding: 4px 12px; color: var(--tf-muted); text-decoration: none; }
.toc a:hover { color: var(--tf-blue); }
article { max-width: 720px; }
article h2 { font-size: 20px; line-height: 1.3; font-weight: 600; margin: 40px 0 8px; scroll-margin-top: 24px; }
article h2:first-child { margin-top: 0; }
article ul { padding-left: 20px; }
article li { margin: 4px 0; }
.note { background: var(--tf-tint); border: 1px solid color-mix(in srgb, var(--tf-blue) 24%, var(--tf-white)); border-radius: var(--tf-radius); padding: 16px 20px; margin: 0 0 32px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; margin: 0 0 32px; }
.card { border: 1px solid var(--tf-line); border-radius: var(--tf-radius); padding: 20px; background: var(--tf-white); }
.card h3 { font-size: 16px; margin: 0 0 4px; font-weight: 600; }
.card p { margin: 0; color: var(--tf-muted); font-size: 15px; }
details { border: 1px solid var(--tf-line); border-radius: var(--tf-radius); padding: 0 20px; margin: 0 0 12px; }
details[open] { border-color: var(--tf-blue); }
summary { cursor: pointer; font-weight: 500; padding: 16px 0; list-style-position: outside; }
details p { margin: 0 0 16px; color: var(--tf-muted); }
table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 8px 0 16px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--tf-line); vertical-align: top; }
th { background: var(--tf-tint); font-weight: 600; font-size: 13px; }
.footer { border-top: 1px solid var(--tf-line); padding: 24px 0; font-size: 14px; color: var(--tf-muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer a { color: var(--tf-muted); margin-left: 16px; }
@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; gap: 24px; }
  .toc { position: static; }
  .nav-inner { flex-wrap: wrap; padding: 12px 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }