/* OmniResearchHub — design system. Plain CSS, no build step. */
:root {
  color-scheme: light dark;
  --bg: #f7f4ee;
  --surface: #fffdf9;
  --ink: #1b1f23;
  --ink-2: #4a5159;
  --ink-3: #737b84;
  --line: #e3ddd1;
  --accent: #0f5c5c;
  --accent-ink: #ffffff;
  --accent-soft: #e0eeec;
  --mark: #c8561b;
  --serif: "Iowan Old Style", "Charter", "Georgia", "Noto Serif", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --measure: 68ch;
  --wide: 72rem;
  --gutter: clamp(1rem, 4vw, 2rem);
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181b;
    --surface: #1b2124;
    --ink: #eceae4;
    --ink-2: #b6bbbf;
    --ink-3: #8a9299;
    --line: #2b3236;
    --accent: #6fc2bd;
    --accent-ink: #0c1214;
    --accent-soft: #1b2e2e;
    --mark: #f08a54;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 5rem; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 1.0625rem/1.65 var(--sans);
  min-height: 100vh; display: flex; flex-direction: column;
}
main { flex: 1; }
img, svg, video { max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--mark); outline-offset: 2px; border-radius: 3px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-ink); padding: .5rem 1rem; z-index: 10; }
.skip:focus { left: 0; }
.wrap { width: 100%; max-width: var(--wide); margin: 0 auto; padding: 0 var(--gutter); }

/* Header */
.site-header { border-bottom: 1px solid var(--line); background: var(--bg); position: sticky; top: 0; z-index: 5; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 3.75rem; }
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--ink); text-decoration: none; font: 700 1.15rem/1 var(--serif); letter-spacing: -.01em; }
.brand svg { width: 1.9rem; height: 1.9rem; flex: none; color: var(--accent); }
.brand b { color: var(--mark); font-weight: 700; }
.nav { display: flex; align-items: center; gap: .25rem; font-size: .95rem; }
.nav a { color: var(--ink-2); text-decoration: none; padding: .5rem .75rem; border-radius: 999px; }
.nav a:hover { background: var(--accent-soft); color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.lang { border: 1px solid var(--line); margin-left: .25rem; font-weight: 600; font-size: .85rem; letter-spacing: .04em; }
.lang span { color: var(--ink-3); }

/* Hero */
.hero { padding: clamp(2.5rem, 8vw, 6rem) 0 clamp(2rem, 5vw, 3.5rem); border-bottom: 1px solid var(--line); }
.eyebrow { font: 600 .8rem/1 var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--mark); margin: 0 0 1.1rem; }
.hero h1 { font: 700 clamp(2.2rem, 6.5vw, 4.25rem)/1.05 var(--serif); letter-spacing: -.02em; margin: 0 0 1.25rem; max-width: 18ch; text-wrap: balance; }
.hero p.lead { font-size: clamp(1.1rem, 2.4vw, 1.35rem); color: var(--ink-2); max-width: 46ch; margin: 0; }

/* Article list */
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; margin: clamp(2rem, 5vw, 3.5rem) 0 1.25rem; }
.section-head h2 { font: 700 1.5rem/1.2 var(--serif); margin: 0; }
.count { color: var(--ink-3); font-size: .9rem; }
.cards { list-style: none; margin: 0 0 clamp(3rem, 7vw, 5rem); padding: 0; display: grid; gap: 1.25rem; grid-template-columns: 1fr; }
@media (min-width: 640px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); display: flex; flex-direction: column; overflow: hidden; transition: transform .15s, box-shadow .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: var(--accent); box-shadow: 0 8px 24px rgb(0 0 0 / .08); }
.card-img { aspect-ratio: 16 / 9; width: 100%; object-fit: cover; background: var(--accent-soft); display: block; }
.card-body { padding: 1.25rem 1.25rem 1.4rem; display: flex; flex-direction: column; gap: .6rem; flex: 1; }
.card h3 { font: 700 1.3rem/1.25 var(--serif); margin: 0; letter-spacing: -.01em; }
.card h3 a { color: var(--ink); text-decoration: none; }
.card h3 a::after { content: ""; position: absolute; inset: 0; } /* whole card clickable */
.card { position: relative; }
.card p { margin: 0; color: var(--ink-2); font-size: .98rem; }
.meta { display: flex; flex-wrap: wrap; gap: .25rem .75rem; color: var(--ink-3); font-size: .85rem; }
.tags { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; padding: 0; margin: 0; }
.tag { font-size: .75rem; font-weight: 600; letter-spacing: .03em; padding: .2rem .6rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.card .tags { margin-top: auto; padding-top: .4rem; }
.empty { border: 1px dashed var(--line); border-radius: var(--radius); padding: 2rem; color: var(--ink-3); text-align: center; grid-column: 1 / -1; }

/* Article page */
.article-head { padding: clamp(2rem, 6vw, 4rem) 0 1.5rem; }
.article-head .inner, .prose, .sources { max-width: var(--measure); margin-inline: auto; }
.crumbs { font-size: .9rem; margin: 0 0 1.25rem; }
.crumbs a { color: var(--ink-3); }
.article-head h1 { font: 700 clamp(2rem, 5.5vw, 3.2rem)/1.1 var(--serif); letter-spacing: -.02em; margin: 0 0 1rem; text-wrap: balance; }
.summary { font: italic 1.25rem/1.5 var(--serif); color: var(--ink-2); margin: 0 0 1.25rem; }
.article-head .meta { margin-bottom: 1rem; }
.prose { font: 1.1875rem/1.75 var(--serif); padding-bottom: 2rem; }
.prose > * + * { margin-top: 1.25em; }
.prose h2 { font: 700 1.7rem/1.25 var(--serif); margin-top: 2.2em; letter-spacing: -.01em; }
.prose h3 { font: 700 1.3rem/1.3 var(--serif); margin-top: 1.8em; }
.prose h2 + *, .prose h3 + * { margin-top: .6em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li + li { margin-top: .4em; }
.prose blockquote { margin-inline: 0; padding: .25rem 0 .25rem 1.25rem; border-left: 4px solid var(--mark); color: var(--ink-2); font-style: italic; }
.prose code { font: .88em var(--mono); background: var(--accent-soft); padding: .1em .35em; border-radius: 4px; }
.prose pre { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; font: .9rem/1.5 var(--mono); }
.prose pre code { background: none; padding: 0; }
.prose figure { margin-inline: 0; }
.prose figure img { border-radius: var(--radius); display: block; }
.prose figcaption { font: .85rem/1.4 var(--sans); color: var(--ink-3); margin-top: .5rem; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.prose table { border-collapse: collapse; width: 100%; min-width: 30rem; font: .95rem/1.4 var(--sans); }
.prose th, .prose td { padding: .65rem .85rem; text-align: left; border-bottom: 1px solid var(--line); }
.prose th { background: var(--accent-soft); font-weight: 600; }
.prose tr:last-child td { border-bottom: 0; }
.callout { background: var(--accent-soft); border-radius: var(--radius); padding: 1rem 1.25rem; font: 1rem/1.55 var(--sans); }
@media (min-width: 1000px) { .prose { font-size: 1.25rem; } .prose figure.wide { margin-inline: -4rem; } }

.sources { border-top: 2px solid var(--ink); padding: 1.5rem 0 3rem; font: 1rem/1.5 var(--sans); }
.sources h2 { font: 700 1.3rem/1.2 var(--serif); margin: 0 0 1rem; }
.sources ol { margin: 0; padding-left: 1.4em; }
.sources li { margin-bottom: .6rem; overflow-wrap: anywhere; }
.sources .domain { color: var(--ink-3); font-size: .85rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 2rem 0; color: var(--ink-3); font-size: .9rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .75rem 2rem; }
.site-footer a { color: var(--ink-2); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print { .site-header, .site-footer, .skip { display: none; } body { background: #fff; color: #000; } .prose { font-size: 11pt; } }