/*
 * research.ksi-digital.com. The palette mirrors the company site
 * (cf-ksi-www tailwind.config.js: primary / secondary scales; body text
 * #1f2937 from src/style.css). Inter is used when installed locally;
 * nothing is fetched from a font CDN.
 */
:root {
  --navy-950: #0f172a;   /* primary-950 */
  --navy-900: #172554;   /* primary-900 */
  --blue-600: #1e3a8a;   /* primary-600 */
  --blue-700: #1e40af;   /* primary-700 */
  --blue-800: #1d4ed8;   /* primary-800 */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --text: #1f2937;
  --bg: #ffffff;
  --radius: 8px;
  --measure: 46rem;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

a { color: var(--blue-700); text-underline-offset: 0.18em; }
a:hover { color: var(--blue-800); }
a:focus-visible { outline: 3px solid var(--blue-800); outline-offset: 2px; border-radius: 2px; }

code, pre { font-family: var(--mono); font-size: 0.9em; }
code { background: var(--slate-100); border: 1px solid var(--slate-200); border-radius: 4px; padding: 0.05em 0.35em; overflow-wrap: anywhere; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 1rem; }

.skip { position: absolute; left: -9999px; top: 0; }
.skip:focus { left: 1rem; top: 1rem; z-index: 10; background: var(--bg); padding: 0.5rem 0.75rem; border-radius: var(--radius); }

/* Header: matches the company site's light navigation bar. */
.site-header { background: var(--slate-50); box-shadow: 0 1px 3px rgba(15, 23, 42, 0.12); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4rem; }
.brand { display: inline-flex; align-items: center; }
.brand img { display: block; height: 2rem; width: auto; }
.header-label { font-size: 0.875rem; font-weight: 600; color: var(--slate-600); letter-spacing: 0.02em; white-space: nowrap; }

/* Hero: the favicon's navy gradient. */
.hero { background: linear-gradient(135deg, var(--blue-600) 0%, var(--navy-950) 100%); color: #fff; padding: 2.75rem 0 2.5rem; }
.eyebrow { margin: 0 0 0.5rem; font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--slate-300); }
.hero h1 { margin: 0 0 1rem; font-size: clamp(1.75rem, 1.2rem + 2.4vw, 2.5rem); line-height: 1.2; font-weight: 700; letter-spacing: -0.01em; }
.lede { margin: 0 0 1.75rem; font-size: 1.125rem; color: var(--slate-200); }
.hero code { background: rgba(255, 255, 255, 0.12); border-color: rgba(255, 255, 255, 0.25); color: #fff; }
.hero a { color: #fff; }
.hero a:hover { color: var(--slate-200); }
.hero a:focus-visible { outline-color: #fff; }

.glance { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.75rem; }
.glance li { background: rgba(255, 255, 255, 0.07); border: 1px solid rgba(255, 255, 255, 0.16); border-radius: var(--radius); padding: 0.75rem 1rem; }
.glance-k { display: block; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--slate-300); margin-bottom: 0.15rem; }
.glance-v { display: block; font-size: 0.975rem; }
.glance code { white-space: nowrap; overflow-wrap: normal; }
@media (min-width: 48rem) { .glance { grid-template-columns: repeat(3, 1fr); } }

/* Content */
.content { padding-top: 2rem; padding-bottom: 3rem; }
.content section { padding-top: 1.75rem; scroll-margin-top: 1rem; }
.content section + section { border-top: 1px solid var(--slate-200); margin-top: 1.75rem; }

h2 { display: flex; align-items: baseline; gap: 0.75rem; margin: 0 0 1rem; font-size: 1.5rem; line-height: 1.3; color: var(--navy-950); }
h3 { margin: 1.5rem 0 0.5rem; font-size: 1.125rem; color: var(--navy-900); }
.num { flex: none; display: inline-grid; place-items: center; width: 1.75rem; height: 1.75rem; border-radius: 50%; background: var(--blue-600); color: #fff; font-size: 0.9rem; font-weight: 700; transform: translateY(-0.1em); }

p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1rem; padding-left: 1.4rem; }
li { margin-bottom: 0.5rem; }
li::marker { color: var(--slate-500); }
strong { color: var(--navy-950); }

.cases { padding-left: 0; list-style: none; counter-reset: case; }
.cases li { counter-increment: case; position: relative; padding: 0.85rem 1rem 0.85rem 3rem; background: var(--slate-50); border: 1px solid var(--slate-200); border-radius: var(--radius); }
.cases li::before { content: "(" counter(case, lower-alpha) ")"; position: absolute; left: 1rem; top: 0.85rem; font-weight: 700; color: var(--blue-700); }

.toc { background: var(--slate-50); border: 1px solid var(--slate-200); border-radius: var(--radius); padding: 1rem 1.25rem 0.5rem; }
.toc-title { margin: 0 0 0.5rem; font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--slate-600); }
.toc ol { margin: 0 0 0.5rem; }
.toc li { margin-bottom: 0.3rem; }
@media (min-width: 40rem) { .toc ol { columns: 2; column-gap: 2rem; } .toc li { break-inside: avoid; } }

pre.ua { margin: 0 0 1rem; padding: 0.9rem 1rem; background: var(--navy-950); color: var(--slate-100); border-radius: var(--radius); white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.5; }
pre.ua code { background: none; border: 0; padding: 0; color: inherit; font-size: 0.95em; }

.contact-line { margin-bottom: 0.75rem; }
.contact-email { display: inline-block; font-size: 1.25rem; font-weight: 600; overflow-wrap: anywhere; }

/* Footer: the company site's navy footer. */
.site-footer { background: var(--navy-950); color: #fff; padding: 1.75rem 0; }
.footer-row { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 0.75rem 2rem; }
.site-footer p { margin: 0; }
.footer-name { font-weight: 700; font-size: 1.125rem; }
.footer-legal, .footer-meta { font-size: 0.875rem; color: var(--slate-400); }

@media (max-width: 30rem) {
  body { font-size: 1rem; }
  .hero { padding: 2rem 0; }
  .lede { font-size: 1.0625rem; }
  h2 { font-size: 1.3rem; }
  .header-label { font-size: 0.8125rem; }
  .brand img { height: 1.75rem; }
}

@media print {
  .site-header, .toc, .skip { display: none; }
  .hero { background: none; color: var(--text); padding: 0 0 1rem; }
  .hero a, .lede, .eyebrow { color: var(--text); }
  .glance li { border-color: var(--slate-300); }
  .glance-k { color: var(--slate-600); }
  pre.ua { background: none; color: var(--text); border: 1px solid var(--slate-300); }
  .site-footer { background: none; color: var(--text); }
}