:root {
	/* QDZRT-wide-layout baseline: one shared shell owner for Header, Footer, archives, pages and Product rails. */
	--qdzrt-shell-wide: 1300px;
	--qdzrt-shell-content: 1100px;
	--qdzrt-product-content: 1004px;
	--qdzrt-product-hero: 1240px;
	--qdzrt-reading: 860px;
	--qdzrt-product-rail: 280px;
	--qdzrt-shell-gap: 16px;
	--qdzrt-layout: var(--qdzrt-shell-wide);
	--qdzrt-gutter: 20px;
	--qdzrt-line: #d8e2ec;
	--qdzrt-paper: #ffffff;
	--qdzrt-ink: #11263c;
	--qdzrt-copy: #3f546a;
}
*, *::before, *::after { box-sizing: border-box; }
html { min-height: 100%; scroll-behavior: smooth; scrollbar-gutter: stable; }
body { min-height: 100vh; margin: 0; overflow-x: clip; display: flex; flex-direction: column; color: var(--qdzrt-ink); background: var(--qdzrt-paper); }
main.site-main { flex: 1 0 auto; }
body > footer { flex-shrink: 0; }
img, svg, video, iframe { max-width: 100%; }
img, svg { height: auto; }
button, input, textarea, select { font: inherit; }
a { color: inherit; }
.screen-reader-text { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.screen-reader-text:focus { top: 8px; left: 8px; z-index: 100000; width: auto; height: auto; padding: 10px 14px; margin: 0; clip: auto; color: #fff; background: #11263c; }
.qdzrt-container { width: min(calc(100% - (var(--qdzrt-gutter) * 2)), var(--qdzrt-layout)); margin-inline: auto; }
.qdzrt-content { width: min(100%, var(--qdzrt-reading)); }

/* Responsive shell gutters are centralized here; component CSS must not invent parallel page widths. */
@media (max-width: 640px) {
	:root { --qdzrt-gutter: 12px; --qdzrt-shell-gap: 16px; }
}