/* The IT Guyde — single CSS file. No framework, no build step. */

:root {
  --bg: #fafafa;
  --bg-elev: #ffffff;
  --ink: #0f172a;
  --ink-soft: #475569;
  --ink-faint: #94a3b8;
  --accent: #2563eb;
  --accent-warm: #f59e0b;
  --rule: #e2e8f0;
  --rule-soft: #f1f5f9;
  --code-bg: #f1f5f9;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --radius: 12px;
  --max: 760px;
  --max-wide: 1080px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.container.wide { max-width: var(--max-wide); }

/* ── header ─────────────────────────────────────────────────── */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg-elev);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
  background-color: rgba(255, 255, 255, 0.85);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}
.brand {
  display: flex;
  gap: 8px;
  align-items: center;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  font-size: 17px;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  background: var(--ink);
  color: var(--accent-warm);
  border-radius: 7px;
  font-size: 16px;
}
.site-nav {
  display: flex;
  gap: 18px;
  font-size: 15px;
}
.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
}
.site-nav a:hover { color: var(--ink); }

/* ── hero ───────────────────────────────────────────────────── */
.hero {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--rule-soft);
}
.hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
.hero-sub { color: var(--ink-soft); font-size: 18px; max-width: 56ch; margin: 0; }

/* ── article list (homepage) ────────────────────────────────── */
.article-list { padding: 32px 0; }
.article-list h2 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin: 0 0 16px;
}
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.card { background: var(--bg-elev); border: 1px solid var(--rule); border-radius: var(--radius); box-shadow: var(--shadow); transition: transform .12s ease, border-color .12s ease; }
.card:hover { transform: translateY(-1px); border-color: var(--accent); }
.card-link {
  display: block;
  padding: 18px 20px;
  color: inherit;
  text-decoration: none;
}
.card-meta {
  display: flex; gap: 10px; align-items: center;
  font-size: 13px;
  color: var(--ink-faint);
  margin: 0 0 6px;
}
.card-title {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.35;
  color: var(--ink);
}
.card-products { margin: 0; display: flex; gap: 6px; flex-wrap: wrap; }
.card-products span {
  display: inline-block;
  font-size: 12px;
  background: var(--rule-soft);
  color: var(--ink-soft);
  padding: 2px 8px;
  border-radius: 999px;
}

/* ── product index ──────────────────────────────────────────── */
.product-index { padding: 24px 0 56px; border-top: 1px solid var(--rule-soft); }
.product-index h2 {
  font-size: 14px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin: 0 0 12px;
}
.product-list { list-style: none; padding: 0; margin: 0; columns: 2; column-gap: 32px; font-size: 15px; }
.product-list li { margin: 4px 0; }
.muted { color: var(--ink-faint); }

/* ── article page ───────────────────────────────────────────── */
.article { padding: 32px 0 64px; }
.article-header { margin-bottom: 28px; }
.article-header h1 {
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.015em;
  margin: 10px 0 12px;
}
.article-meta { color: var(--ink-faint); font-size: 14px; margin: 0 0 14px; }
.conf {
  font-weight: 600;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 12px;
}
.conf-high { background: #dcfce7; color: #166534; }
.conf-medium { background: #fef3c7; color: #92400e; }
.conf-low { background: #f1f5f9; color: var(--ink-soft); }

.product-chips { list-style: none; padding: 0; margin: 8px 0 0; display: flex; gap: 6px; flex-wrap: wrap; }
.product-chips li {
  font-size: 13px;
  background: var(--rule-soft);
  color: var(--ink-soft);
  padding: 3px 10px;
  border-radius: 999px;
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  margin: 0 0 12px;
}
.badge-recurrence { background: #fef3c7; color: #92400e; }
.badge-cross-vendor { background: #ddd6fe; color: #5b21b6; }

.article-body h2 {
  margin-top: 36px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.article-body h3 { margin-top: 28px; font-size: 18px; }
.article-body ol, .article-body ul { padding-left: 1.5em; }
.article-body li { margin: 6px 0; }
.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 16px;
  margin: 16px 0;
  color: var(--ink-soft);
  background: var(--rule-soft);
  border-radius: 0 6px 6px 0;
}
.article-body code {
  background: var(--code-bg);
  padding: 1px 6px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
}
.article-body a { color: var(--accent); }
.article-body a:hover { text-decoration: underline; }
.article-body hr { border: 0; border-top: 1px solid var(--rule); margin: 28px 0; }

/* related callouts at bottom of articles */
.related {
  margin-top: 32px;
  padding: 16px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--rule);
  background: var(--bg-elev);
}
.related h3 { margin: 0 0 6px; font-size: 16px; }
.related p { margin: 0; color: var(--ink-soft); }
.related-recurrence { border-left: 4px solid var(--accent-warm); }
.related-cross-vendor { border-left: 4px solid #7c3aed; }

/* ── empty state ────────────────────────────────────────────── */
.empty-state {
  padding: 56px 0;
  text-align: center;
  color: var(--ink-soft);
}
.empty-state code { background: var(--code-bg); padding: 2px 8px; border-radius: 4px; }

/* ── footer ─────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 24px 0 40px;
  margin-top: 40px;
  color: var(--ink-faint);
  font-size: 14px;
  background: var(--bg-elev);
}
.site-footer small { color: var(--ink-faint); }

@media (max-width: 540px) {
  .product-list { columns: 1; }
  .site-header .container { padding-top: 10px; padding-bottom: 10px; }
  .hero { padding: 32px 0 24px; }
}