/*
 * LoomWire — article.css
 * Individual article pages
 * ─────────────────────────────────────
 * Imports tokens from styles.css via shared root variables.
 * Link BOTH files on every article page:
 *   <link rel="stylesheet" href="styles.css">
 *   <link rel="stylesheet" href="article.css">
 *
 * Table of contents
 *  1.  Article Nav overrides
 *  2.  Article Hero (header)
 *  3.  Article Layout (2-column)
 *  4.  Article Content typography
 *  5.  Content blocks — callout, spec, code, figure, decision
 *  6.  Article Sidebar
 *  7.  Article Tags
 *  8.  Article CTA
 *  9.  Responsive
 */


/* ═══════════════════════════════════════════════
   1. ARTICLE NAV OVERRIDES
   Simplified nav: logo + back link + lang toggle
═══════════════════════════════════════════════ */
.nav--article .nav__inner {
  grid-template-columns: auto 1fr auto;
}
.nav__back {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: var(--ts-xs);
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.55);
  transition: color var(--t-fast) var(--ease);
  min-height: 44px;
  justify-self: center;
}
.nav__back::before { content: '←'; font-size: .9rem; }
.nav__back:hover { color: var(--c-copper-lt); }


/* ═══════════════════════════════════════════════
   2. ARTICLE HERO
═══════════════════════════════════════════════ */
.art-hero {
  background: var(--c-navy);
  padding: clamp(6rem, 10vw, 9rem) 0 clamp(3rem, 5vw, 5rem);
  position: relative;
  overflow: hidden;
}
.art-hero::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(184,115,51,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(184,115,51,.04) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
.art-hero__inner {
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Breadcrumb */
.art-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-wrap: wrap;
  margin-bottom: var(--sp-6);
}
.art-breadcrumb a {
  font-size: var(--ts-xs);
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.38);
  transition: color var(--t-fast) var(--ease);
}
.art-breadcrumb a:hover { color: var(--c-copper-lt); }
.art-breadcrumb__sep {
  color: rgba(255,255,255,.18);
  font-size: var(--ts-xs);
}

/* Category badge */
.art-badge {
  display: inline-block;
  font-size: var(--ts-xs);
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-white);
  background: var(--c-copper);
  padding: 4px 12px;
  margin-bottom: var(--sp-5);
}

/* Article H1 */
.art-title {
  font-family: var(--f-display);
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 900;
  color: var(--c-white);
  line-height: 1.06;
  letter-spacing: -.01em;
  margin-bottom: var(--sp-5);
}

/* Sub-headline / deck */
.art-deck {
  font-size: clamp(.95rem, 1.4vw, 1.1rem);
  font-weight: 300;
  color: rgba(255,255,255,.62);
  line-height: 1.78;
  max-width: 640px;
  margin-bottom: var(--sp-8);
}

/* Meta bar — date, read time, author, standard */
.art-meta-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
  flex-wrap: wrap;
  padding-top: var(--sp-6);
  border-top: 1px solid rgba(255,255,255,.08);
}
.art-meta-item {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--ts-xs);
  color: rgba(255,255,255,.44);
  font-weight: 500;
}
.art-meta-label {
  color: rgba(255,255,255,.22);
  font-size: var(--ts-xs);
  text-transform: uppercase;
  letter-spacing: .1em;
}


/* ═══════════════════════════════════════════════
   3. ARTICLE LAYOUT
   Two-column: main content + sidebar
═══════════════════════════════════════════════ */
.art-layout {
  max-width: 1320px;
  margin: 0 auto;
  padding: clamp(3rem, 5vw, 5rem) clamp(1.25rem, 4vw, 3.5rem);
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 4rem;
  align-items: start;
}


/* ═══════════════════════════════════════════════
   4. ARTICLE CONTENT TYPOGRAPHY
   Optimised for long-form technical reading.
   Add class="art-content" to the <main> element.
═══════════════════════════════════════════════ */
.art-content {
  /* Readable measure — 65–75 characters per line */
  max-width: 72ch;
}

/* Section headings inside article */
.art-content h2 {
  font-family: var(--f-display);
  font-size: clamp(1.6rem, 2.8vw, 2rem);
  font-weight: 900;
  color: var(--c-navy);
  line-height: 1.1;
  /* Space above: bigger than below, creates grouping */
  margin: 3rem 0 1rem;
  padding-bottom: .75rem;
  border-bottom: 2px solid var(--c-border);
}
.art-content h2:first-child { margin-top: 0; }

.art-content h3 {
  font-family: var(--f-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-navy);
  margin: 2rem 0 .75rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.art-content h4 {
  font-size: var(--ts-base);
  font-weight: 700;
  color: var(--c-navy);
  margin: 1.5rem 0 .5rem;
}

/* Body paragraphs — engineered for legibility */
.art-content p {
  /*
   * Font size: .97rem is slightly larger than body default.
   * This reduces eye strain for technical reading sessions.
   */
  font-size: .97rem;
  font-weight: 400;
  color: var(--c-body);
  line-height: 1.88;          /* generous for technical content */
  margin-bottom: 1.25rem;
}
.art-content p strong { color: var(--c-navy); font-weight: 600; }
.art-content p em     { font-style: italic; color: var(--c-navy); }

/* Lists */
.art-content ul,
.art-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}
.art-content li {
  font-size: .95rem;
  color: var(--c-body);
  line-height: 1.82;
  margin-bottom: .45rem;
}
.art-content li strong { color: var(--c-navy); font-weight: 600; }

/* Inline code */
.art-content code {
  font-family: var(--f-mono);
  font-size: .88em;
  color: var(--c-copper-dk);
  background: rgba(184,115,51,.08);
  padding: 1px 5px;
  border-radius: 2px;
}

/* Horizontal rule */
.art-divider {
  height: 1px;
  background: var(--c-border);
  border: none;
  margin: 3rem 0;
}


/* ═══════════════════════════════════════════════
   5. CONTENT BLOCKS
   Use inside .art-content for rich technical layout.
═══════════════════════════════════════════════ */

/* ── Callout boxes ── */
/*
 * Usage:
 *   <div class="callout callout--note">
 *     <span class="callout__icon">📌</span>
 *     <div class="callout__text"><strong>Label:</strong> Body text.</div>
 *   </div>
 *
 * Variants: callout--note  (copper/info)
 *           callout--warn  (red/warning)
 *           callout--tip   (green/success)
 */
.callout {
  display: flex;
  gap: var(--sp-4);
  padding: var(--sp-5) var(--sp-6);
  margin: var(--sp-6) 0;
}
.callout--note { background: rgba(184,115,51,.07); border-left: 3px solid var(--c-copper); }
.callout--warn { background: rgba(200,50,50,.06);  border-left: 3px solid var(--c-danger); }
.callout--tip  { background: rgba(46,125,72,.06);  border-left: 3px solid var(--c-success); }
.callout__icon { font-size: 1.1rem; flex-shrink: 0; margin-top: .1rem; }
.callout__text { font-size: var(--ts-sm); color: var(--c-body); line-height: 1.72; }
.callout__text strong { color: var(--c-navy); }

/* ── Spec block (dark table) ── */
/*
 * Usage:
 *   <div class="spec-block">
 *     <div class="spec-block__title">Table title</div>
 *     <table class="spec-table"> … </table>
 *   </div>
 */
.spec-block {
  background: var(--c-navy);
  border-left: 3px solid var(--c-copper);
  padding: var(--sp-6);
  margin: var(--sp-8) 0;
  overflow-x: auto;       /* horizontal scroll on narrow screens */
}
.spec-block__title {
  font-size: var(--ts-xs);
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-copper);
  margin-bottom: var(--sp-5);
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  /* Minimum column width to prevent text wrapping badly */
  min-width: 400px;
}
.spec-table th {
  font-size: var(--ts-xs);
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
  text-align: left;
  padding: .5rem .75rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.spec-table td {
  font-size: var(--ts-sm);
  color: rgba(255,255,255,.78);
  padding: .65rem .75rem;
  border-bottom: 1px solid rgba(255,255,255,.06);
  line-height: 1.55;
  vertical-align: top;
}
.spec-table tr:last-child td { border-bottom: none; }
.spec-table .hl  { color: var(--c-copper-lt); font-weight: 600; }
.spec-table .ok  { color: #6FCF97; }
.spec-table .bad { color: #EB5757; }

/* ── Code block ── */
/*
 * For part numbers, EPLAN strings, formulas, config values.
 *   <pre class="code-block"><code>…</code></pre>
 */
.code-block {
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-copper);
  padding: var(--sp-5) var(--sp-6);
  margin: var(--sp-6) 0;
  overflow-x: auto;
}
.code-block code {
  font-family: var(--f-mono);
  font-size: .88rem;
  color: var(--c-navy);
  line-height: 1.72;
  background: none;
  padding: 0;
}
.code-block .comment { color: var(--c-muted); font-style: italic; }
.code-block .key     { color: var(--c-copper-dk); font-weight: 600; }

/* ── Figure with caption ── */
/*
 *   <figure class="art-figure">
 *     <img src="…" alt="…">
 *     <figcaption>Caption text</figcaption>
 *   </figure>
 */
.art-figure { margin: var(--sp-8) 0; }
.art-figure img {
  width: 100%;
  border: 1px solid var(--c-border);
}
.art-figure figcaption {
  font-size: var(--ts-xs);
  color: var(--c-muted);
  text-align: center;
  padding: var(--sp-3) var(--sp-4);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-top: none;
  font-style: italic;
  line-height: 1.6;
}

/* Image placeholder — use when no image available */
.art-placeholder {
  width: 100%;
  min-height: 200px;
  background: var(--c-navy);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  margin: var(--sp-8) 0;
  border: 1px dashed rgba(184,115,51,.3);
}
.art-placeholder span {
  font-size: var(--ts-xs);
  color: rgba(255,255,255,.3);
  letter-spacing: .1em;
  text-transform: uppercase;
}

/* ── Decision flow ── */
/*
 * Stepped decision framework.
 *   <div class="decision-flow">
 *     <div class="decision-step"> … </div>
 *   </div>
 */
.decision-flow { margin: var(--sp-8) 0; }
.decision-step {
  display: flex;
  gap: var(--sp-4);
  padding: var(--sp-5) var(--sp-6);
  background: var(--c-navy);
  margin-bottom: 1px;
}
.decision-step__num {
  font-family: var(--f-display);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--c-copper);
  flex-shrink: 0;
  line-height: 1;
  min-width: 2rem;
}
.decision-step__q {
  font-size: var(--ts-sm);
  font-weight: 700;
  color: var(--c-white);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: var(--sp-3);
}
.decision-step__answers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2);
}
.decision-answer {
  padding: var(--sp-3) var(--sp-4);
  font-size: var(--ts-sm);
  line-height: 1.55;
}
.decision-answer--yes {
  background: rgba(46,125,72,.15);
  border-left: 2px solid var(--c-success);
  color: rgba(255,255,255,.8);
}
.decision-answer--no {
  background: rgba(255,255,255,.04);
  border-left: 2px solid rgba(255,255,255,.12);
  color: rgba(255,255,255,.5);
}
.decision-answer__label {
  font-size: var(--ts-xs);
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  margin-bottom: var(--sp-1);
}
.decision-answer--yes .decision-answer__label { color: var(--c-success); }
.decision-answer--no  .decision-answer__label { color: rgba(255,255,255,.28); }
.decision-answer strong { color: var(--c-copper-lt); }


/* ═══════════════════════════════════════════════
   6. ARTICLE SIDEBAR
═══════════════════════════════════════════════ */
.art-sidebar {
  position: sticky;
  top: 96px;          /* clears fixed nav */
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}

.sidebar-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: var(--sp-6);
}
.sidebar-card--dark {
  background: var(--c-navy);
  border-color: rgba(184,115,51,.2);
}

.sidebar-card__title {
  font-family: var(--f-display);
  font-size: var(--ts-sm);
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-copper);
  margin-bottom: var(--sp-5);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--c-line);
}
.sidebar-card--dark .sidebar-card__title { border-color: rgba(255,255,255,.1); }

/* TOC navigation */
.sidebar-toc {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}
.sidebar-toc a {
  display: block;
  font-size: var(--ts-sm);
  color: var(--c-body);
  padding: var(--sp-2) var(--sp-3);
  border-left: 2px solid var(--c-line);
  line-height: 1.45;
  transition:
    color        var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    background   var(--t-fast) var(--ease);
}
.sidebar-toc a:hover,
.sidebar-toc a.is-active {
  color: var(--c-copper);
  border-left-color: var(--c-copper);
  background: rgba(184,115,51,.05);
}

/* Spec rows */
.sidebar-spec-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--sp-2);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--c-border);
  font-size: var(--ts-sm);
}
.sidebar-spec-row:last-child { border-bottom: none; }
.sidebar-spec-key { color: var(--c-muted); font-weight: 500; flex-shrink: 0; }
.sidebar-spec-val { color: var(--c-navy); font-weight: 600; text-align: right; }

/* Related article links */
.sidebar-links {
  list-style: none;
  display: flex;
  flex-direction: column;
}
.sidebar-link {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-2);
  font-size: var(--ts-sm);
  color: var(--c-body);
  padding: var(--sp-3) 0;
  border-bottom: 1px solid var(--c-border);
  line-height: 1.45;
  transition: color var(--t-fast) var(--ease);
  /* Touch target */
  min-height: 44px;
}
.sidebar-link:last-child { border-bottom: none; }
.sidebar-link::before {
  content: '→';
  color: var(--c-copper);
  font-size: var(--ts-xs);
  flex-shrink: 0;
  margin-top: 3px;
}
.sidebar-link:hover { color: var(--c-copper); }


/* ═══════════════════════════════════════════════
   7. ARTICLE TAGS
═══════════════════════════════════════════════ */
.art-tags {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
  margin-top: var(--sp-8);
  padding-top: var(--sp-6);
  border-top: 1px solid var(--c-border);
}
.art-tag {
  font-size: var(--ts-xs);
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-muted);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: 4px 10px;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
  cursor: default;
}
.art-tag:hover { background: var(--c-navy); color: var(--c-copper-lt); }


/* ═══════════════════════════════════════════════
   8. ARTICLE CTA
   Bottom of every article — drives quote requests.
═══════════════════════════════════════════════ */
.art-cta {
  background: var(--c-navy);
  padding: 2.5rem clamp(1.5rem, 4vw, 3rem);
  margin-top: var(--sp-12);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--sp-8);
  align-items: center;
  border-top: 3px solid var(--c-copper);
}
.art-cta h3 {
  font-family: var(--f-display);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--c-white);
  margin-bottom: var(--sp-2);
}
.art-cta p {
  font-size: var(--ts-sm);
  color: rgba(255,255,255,.5);
  line-height: 1.65;
  max-width: 460px;
}
.art-cta__actions {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  align-items: flex-end;
  flex-shrink: 0;
}


/* ═══════════════════════════════════════════════
   9. ARTICLE RESPONSIVE
═══════════════════════════════════════════════ */
@media (max-width: 1024px) {
  /* Collapse to single column — sidebar moves below content */
  .art-layout { grid-template-columns: 1fr; gap: var(--sp-12); }
  .art-sidebar { position: static; }
  /* CTA: stack on narrow */
  .art-cta { grid-template-columns: 1fr; }
  .art-cta__actions { align-items: flex-start; flex-direction: row; flex-wrap: wrap; }
  /* Decision answers: single column */
  .decision-step__answers { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .art-hero { padding-top: clamp(5rem, 8vw, 7rem); }
  .art-meta-bar { gap: var(--sp-4); }
  .spec-block { padding: var(--sp-4); }
  .code-block { padding: var(--sp-4); }
}