/* ==========================================================================
   Creative Piping Solutions — Blog Article
   "Technical Datasheet" design system (shared with us-page.css)
   Scope: from <h1> through the section immediately before the site footer.
   Namespaced with the `cfb-` prefix (Creative Forged Blog) to avoid
   collisions with existing site CSS and with us-page.css's `cfu-` scope.
   ========================================================================== */

.cfb-page {
  --cfb-bg: #EEF1EF;
  --cfb-surface: #FFFFFF;
  --cfb-navy: #1B2A38;
  --cfb-steel: #2E5A78;
  --cfb-accent: #C1571E;
  --cfb-line: #D6DBD8;
  --cfb-ink: #202A31;
  --cfb-muted: #566068;
  --cfb-radius: 2px;
  --cfb-maxw: 1180px;
  --cfb-article-w: 760px;

  background: var(--cfb-bg);
  color: var(--cfb-ink);
  font-family: "IBM Plex Sans", -apple-system, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.cfb-page * { box-sizing: border-box; }

.cfb-page h1, .cfb-page h2, .cfb-page h3, .cfb-page h4 {
  font-family: "IBM Plex Sans Condensed", "IBM Plex Sans", Arial, sans-serif;
  color: var(--cfb-navy);
  line-height: 1.2;
  margin: 0;
  font-weight: 600;
}

.cfb-page a { color: var(--cfb-steel); text-decoration: underline; text-underline-offset: 2px; }
.cfb-page a:hover { color: var(--cfb-accent); }
.cfb-page a:focus-visible, .cfb-page summary:focus-visible {
  outline: 2px solid var(--cfb-accent); outline-offset: 2px;
}

.cfb-wrap { max-width: var(--cfb-maxw); margin: 0 auto; padding: 0 24px; }
.cfb-article { max-width: var(--cfb-article-w); margin: 0 auto; padding: 0 24px; }

/* ---------- Breadcrumb ---------- */

.cfb-breadcrumb {
  padding: 18px 0 0;
  font-size: 13px;
  color: var(--cfb-muted);
}
.cfb-breadcrumb a { color: var(--cfb-steel); text-decoration: none; }
.cfb-breadcrumb a:hover { text-decoration: underline; }
.cfb-breadcrumb span[aria-hidden] { margin: 0 6px; color: var(--cfb-line); }

/* ---------- Article header ---------- */

.cfb-header {
  border-bottom: 1px solid var(--cfb-line);
  padding: 22px 0 44px;
  background:
    repeating-linear-gradient(0deg, rgba(46,90,120,0.05) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(46,90,120,0.05) 0 1px, transparent 1px 48px);
}

.cfb-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--cfb-steel);
  border: 1px solid var(--cfb-line);
  background: var(--cfb-surface);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.cfb-tag .cfb-dot { width: 6px; height: 6px; background: var(--cfb-accent); border-radius: 50%; }

.cfb-header h1 {
  font-size: clamp(28px, 4vw, 44px);
  max-width: 22ch;
  margin-bottom: 16px;
}

.cfb-dek {
  font-size: 18px;
  color: var(--cfb-muted);
  max-width: 68ch;
  margin-bottom: 22px;
}

.cfb-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 13.5px;
  color: var(--cfb-muted);
  border-top: 1px solid var(--cfb-line);
  padding-top: 16px;
}
.cfb-meta strong { color: var(--cfb-ink); font-weight: 600; }

/* ---------- Table of contents ---------- */

.cfb-toc {
  background: var(--cfb-surface);
  border: 1px solid var(--cfb-line);
  padding: 20px 22px;
  margin: 40px 0;
}
.cfb-toc p {
  margin: 0 0 12px;
  font-family: "IBM Plex Sans Condensed", sans-serif;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cfb-navy);
  text-transform: uppercase;
}
.cfb-toc ol {
  margin: 0;
  padding-left: 0;
  list-style: none;
  columns: 2;
  column-gap: 24px;
}
.cfb-toc li { break-inside: avoid; margin-bottom: 8px; font-size: 14px; }
.cfb-toc a { text-decoration: none; color: var(--cfb-steel); }
.cfb-toc a:hover { color: var(--cfb-accent); }
@media (max-width: 560px) { .cfb-toc ol { columns: 1; } }

/* ---------- Prose ---------- */

.cfb-prose { padding: 8px 0 0; }
.cfb-prose > * + * { margin-top: 18px; }

.cfb-prose p { font-size: 16.5px; color: var(--cfb-ink); }
.cfb-prose p.cfb-lede { font-size: 18px; color: var(--cfb-muted); }

.cfb-prose ul, .cfb-prose ol.cfb-plain {
  padding-left: 20px;
  display: grid;
  gap: 8px;
}
.cfb-prose li { font-size: 16px; }

.cfb-section { padding-top: 46px; }
.cfb-section h2 {
  font-size: clamp(21px, 2.6vw, 27px);
  padding-top: 4px;
  border-top: 3px solid var(--cfb-navy);
  padding-top: 14px;
}
.cfb-section h3 {
  font-size: 18px;
  margin-top: 26px;
  color: var(--cfb-steel);
}

/* Clarifying note callout (e.g. Lap Joint "technically a type, not a facing") */
.cfb-note {
  border-left: 3px solid var(--cfb-accent);
  background: var(--cfb-surface);
  padding: 14px 18px;
  font-size: 15px;
  color: var(--cfb-muted);
}
.cfb-note strong { color: var(--cfb-ink); }

/* ---------- Key Features spec box ---------- */

.cfb-spec {
  background: var(--cfb-surface);
  border: 1px solid var(--cfb-line);
  margin-top: 20px;
  position: relative;
}
.cfb-spec::before {
  content: "";
  position: absolute; top: 0; left: 0;
  width: 16px; height: 16px;
  border-top: 2px solid var(--cfb-accent);
  border-left: 2px solid var(--cfb-accent);
}
.cfb-spec-head {
  font-family: "IBM Plex Sans Condensed", sans-serif;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #fff;
  background: var(--cfb-navy);
  padding: 10px 18px;
}
.cfb-spec dl {
  margin: 0;
  display: grid;
  grid-template-columns: 190px 1fr;
}
.cfb-spec dt {
  padding: 12px 18px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--cfb-navy);
  border-top: 1px solid var(--cfb-line);
  border-right: 1px solid var(--cfb-line);
  background: var(--cfb-bg);
}
.cfb-spec dd {
  margin: 0;
  padding: 12px 18px;
  font-size: 14.5px;
  color: var(--cfb-ink);
  border-top: 1px solid var(--cfb-line);
}
@media (max-width: 620px) {
  .cfb-spec dl { grid-template-columns: 1fr; }
  .cfb-spec dt { border-right: none; padding-bottom: 4px; }
  .cfb-spec dd { padding-top: 0; padding-bottom: 14px; }
}

/* ---------- Tables (comparison) ---------- */

.cfb-table-wrap { overflow-x: auto; border: 1px solid var(--cfb-line); margin-top: 18px; }
.cfb-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 560px; }
.cfb-table th, .cfb-table td { padding: 11px 14px; border-bottom: 1px solid var(--cfb-line); text-align: left; }
.cfb-table thead th {
  background: var(--cfb-navy); color: #fff;
  font-family: "IBM Plex Sans Condensed", sans-serif; font-weight: 600;
}
.cfb-table tbody tr:nth-child(even) { background: rgba(46,90,120,0.045); }

/* ---------- FAQ ---------- */

.cfb-faq { display: grid; gap: 10px; margin-top: 18px; }
.cfb-faq details { border: 1px solid var(--cfb-line); background: var(--cfb-surface); padding: 4px 18px; }
.cfb-faq summary {
  cursor: pointer; padding: 14px 0; font-weight: 600; color: var(--cfb-navy);
  font-size: 15.5px; list-style: none; display: flex; justify-content: space-between; gap: 16px;
}
.cfb-faq summary::-webkit-details-marker { display: none; }
.cfb-faq summary::after { content: "+"; color: var(--cfb-accent); font-size: 20px; flex: none; }
.cfb-faq details[open] summary::after { content: "\2212"; }
.cfb-faq p { padding: 0 0 16px; margin: 0; color: var(--cfb-muted); font-size: 14.5px; }

/* ---------- CTA band ---------- */

.cfb-cta { background: var(--cfb-navy); padding: 48px 0; margin-top: 54px; }
.cfb-cta-inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 22px; }
.cfb-cta h2 { color: #fff; font-size: clamp(20px, 2.4vw, 26px); max-width: 32ch; border: none; padding: 0; }
.cfb-cta p { color: #C7D2DA; margin-top: 8px; font-size: 15px; max-width: 56ch; }
.cfb-cta-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.cfb-btn {
  display: inline-block; padding: 12px 24px; font-size: 14.5px; font-weight: 600;
  border-radius: var(--cfb-radius); border: 1px solid transparent; text-decoration: none;
}
.cfb-btn-primary { background: var(--cfb-accent); color: #fff; }
.cfb-btn-primary:hover { background: #a54813; color: #fff; }
.cfb-btn-ghost { background: transparent; border-color: #fff; color: #fff; }
.cfb-btn-ghost:hover { border-color: var(--cfb-accent); color: var(--cfb-accent); }

/* ---------- Related links ---------- */

.cfb-related { margin-top: 54px; padding-top: 32px; border-top: 1px solid var(--cfb-line); }
.cfb-related p { margin: 0 0 14px; font-family: "IBM Plex Sans Condensed", sans-serif; font-weight: 600; color: var(--cfb-navy); text-transform: uppercase; font-size: 14px; letter-spacing: 0.02em; }
.cfb-related-grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.cfb-related-card {
  border: 1px solid var(--cfb-line); background: var(--cfb-surface); padding: 16px 18px; position: relative;
}
.cfb-related-card::before { content: ""; position: absolute; top: 0; left: 0; width: 14px; height: 14px; border-top: 2px solid var(--cfb-steel); border-left: 2px solid var(--cfb-steel); }
.cfb-related-card a { font-weight: 600; text-decoration: none; color: var(--cfb-navy); font-size: 15px; }
.cfb-related-card a:hover { color: var(--cfb-accent); }
.cfb-related-card span { display: block; font-size: 13px; color: var(--cfb-muted); margin-top: 4px; }

/* ---------- Responsive ---------- */

@media (max-width: 560px) {
  .cfb-header { padding-bottom: 30px; }
  .cfb-meta { gap: 10px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  .cfb-page * { transition: none !important; animation: none !important; }
}