/* ============================================================
   ARTICLE PAGE STYLES — Cairns
   ============================================================ */

/* ── Scroll Progress Bar ── */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--accent);
  z-index: 200;
  transition: width 0.1s linear;
}

/* ── Two-Column Grid Layout ── */
.page-grid {
  display: grid;
  grid-template-columns: 150px 1fr;
  max-width: 920px;
  margin: 0 auto;
  padding: 3rem 1.5rem 0;
  gap: 2.5rem;
}

/* ── Left Sidebar TOC ── */
.toc-sidebar {
  position: sticky;
  top: 2rem;
  align-self: start;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
}
.toc-sidebar__label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}
.toc-sidebar__list {
  list-style: none;
}
.toc-sidebar__list li {
  margin-bottom: 0.1rem;
}
.toc-sidebar__list a {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.3rem 0 0.3rem 0.7rem;
  border-left: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  line-height: 1.4;
}
.toc-sidebar__list a:hover {
  color: var(--text);
  text-decoration: none;
}
.toc-sidebar__list a.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

/* ── Article Content Column ── */
.article-content {
  max-width: 720px;
}

/* ── Article Header ── */
.article-header {
  margin-bottom: 2.5rem;
}
.article-header__eyebrow {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.8rem;
}
.article-header__title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.2;
  margin-bottom: 0.6rem;
}
.article-header__subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.4rem;
  line-height: 1.5;
}
.article-header__lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.75;
}
.article-header__lead em { color: var(--text-bright); font-style: italic; }

/* ── Section Headings ── */
.article-body section {
  margin-bottom: 2.5rem;
}
.article-body section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-bright);
  line-height: 1.3;
  margin-bottom: 1rem;
  padding-top: 4rem;
}
.article-body section:first-of-type h2 {
  padding-top: 0;
}
.article-body section h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-top: 1.8rem;
  margin-bottom: 0.6rem;
}

/* ── Body Text ── */
.article-body p {
  font-size: 1rem;
  line-height: 1.78;
  margin-bottom: 1rem;
  color: var(--text);
}
.article-body .newthought {
  font-variant: small-caps;
  font-weight: 700;
  font-size: 1.08em;
  letter-spacing: 0.02em;
  color: var(--text-bright);
}
.article-body strong { color: var(--text-bright); }
.article-body em { font-style: italic; }
.article-body ul,
.article-body ol {
  margin-bottom: 1rem;
  padding-left: 1.4rem;
}
.article-body li {
  font-size: 1rem;
  line-height: 1.78;
  margin-bottom: 0.35rem;
  color: var(--text);
}
.article-body code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.12rem 0.4rem;
  color: var(--text-bright);
}
.article-body pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.2rem;
  margin-bottom: 1rem;
  overflow-x: auto;
}
.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.82rem;
  line-height: 1.6;
}

/* ── Sidenotes (click-to-expand inline) ── */
.sidenote-number {
  cursor: pointer;
  counter-increment: sidenote-counter;
}
.sidenote-number::after {
  content: counter(sidenote-counter);
  font-size: 0.6rem;
  vertical-align: super;
  color: var(--accent);
  font-weight: 700;
  margin-left: 1px;
}
.margin-toggle { display: none; }
.sidenote {
  display: none;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-muted);
}
.margin-toggle:checked + .sidenote {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  padding: 0.8rem 1rem;
  margin: 0.6rem 0 1rem;
}
.margin-toggle:checked + .sidenote::before {
  content: counter(sidenote-counter) ". ";
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent);
}

/* ── Callout Boxes ── */
.callout {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0 6px 6px 0;
  padding: 1.5rem;
  margin: 1.2rem 0 1.4rem;
  border-left: 3px solid var(--accent);
}
.callout-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  color: var(--accent);
}
.callout p {
  margin-bottom: 0;
}
.callout-key { border-left-color: var(--green); }
.callout-key .callout-label { color: var(--green); }
.callout-tip { border-left-color: var(--blue); }
.callout-tip .callout-label { color: var(--blue); }
.callout-warn { border-left-color: var(--orange); }
.callout-warn .callout-label { color: var(--orange); }
.callout-def { border-left-color: var(--accent); }
.callout-def .callout-label { color: var(--accent); }

/* ── Scenario Blocks (Slack mockups) ── */
.scenario {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.2rem;
  margin: 1.2rem 0 1.4rem;
}
.scenario-header {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.8rem;
}
.slack-msg {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.7rem 0.9rem;
  margin-bottom: 0.5rem;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text);
}
.slack-msg:last-child { margin-bottom: 0; }
.slack-msg .sender {
  font-weight: 700;
  margin-right: 0.4rem;
}
.slack-msg .sender.bot { color: var(--accent); }
.slack-msg .sender.human { color: var(--blue); }
.slack-msg code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg-card-alt);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1rem 0.35rem;
  color: var(--text-bright);
}

/* ── Summary List ── */
.summary-list {
  list-style: none;
  padding-left: 0;
  counter-reset: summary-counter;
}
.summary-list li {
  counter-increment: summary-counter;
  padding-left: 2.4rem;
  position: relative;
  margin-bottom: 0.7rem;
}
.summary-list li::before {
  content: counter(summary-counter);
  position: absolute;
  left: 0;
  top: 0.05rem;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Discussion Prompts ── */
.discussion-prompts {
  list-style: none;
  padding-left: 0;
}
.discussion-prompts li {
  padding-left: 1.8rem;
  position: relative;
  margin-bottom: 0.7rem;
}
.discussion-prompts li::before {
  content: "\1F4AC";
  position: absolute;
  left: 0;
  top: 0;
  font-size: 1rem;
}

/* ── References ── */
.references {
  padding-left: 1.4rem;
}
.references li {
  margin-bottom: 0.5rem;
}
.references .annotation {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
}

/* ── Article Footer / Colophon ── */
.colophon {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.7;
  text-align: center;
}

/* ── Section Reveal Animation ── */
.article-body[data-animate] section {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.article-body[data-animate] section.visible {
  opacity: 1;
  transform: none;
}
.article-body[data-animate] section:first-of-type {
  opacity: 1;
  transform: none;
}

/* ── Accessibility: Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  .progress-bar { transition: none; }
  .article-body[data-animate] section {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ── Print Styles ── */
@media print {
  :root {
    --bg: #fff;
    --bg-card: #f8f8f8;
    --bg-card-alt: #f4f4f4;
    --border: #ddd;
    --border-light: #ccc;
    --text: #222;
    --text-muted: #666;
    --text-bright: #000;
    --accent: #5a3fd4;
  }
  .progress-bar,
  .toc-sidebar { display: none; }
  body { font-size: 12pt; }
  .page-grid {
    display: block;
    max-width: 100%;
    padding: 0;
  }
  .article-content { max-width: 100%; }
  .sidenote {
    display: block !important;
    float: none !important;
    width: auto !important;
    margin: 0.5rem 0 0.5rem 1.5rem !important;
    padding: 0.5rem;
    background: #f5f5f5;
    border-left: 2px solid #999;
    font-size: 0.85rem;
  }
  .sidenote::before {
    content: "Note " counter(sidenote-counter) ": ";
    font-weight: 700;
  }
}

/* ── Trail Navigation ── */
.trail-nav {
  margin-top: 2.5rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.trail-nav__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.trail-nav__position {
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.trail-nav__links {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}
.trail-nav__link {
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
}
.trail-nav__link:hover { text-decoration: underline; }
.trail-nav__disabled {
  color: var(--text-muted);
  opacity: 0.4;
}
.trail-nav__next { text-align: right; }

/* ── Related Cairns ── */
.related-cairns {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.related-cairns ul {
  list-style: none;
  padding: 0;
}
.related-cairns li {
  padding: 0.4rem 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.related-cairns li a {
  color: var(--accent);
  font-weight: 600;
}

/* ── Responsive ── */
@media (max-width: 999px) {
  .toc-sidebar { display: none; }
  .page-grid {
    grid-template-columns: 1fr;
    padding: 2rem 1.5rem 0;
  }
  .article-header__title { font-size: 2rem; }
}
@media (max-width: 600px) {
  .page-grid { padding: 1.5rem 1rem 0; }
  .article-header__title { font-size: 1.6rem; }
  .article-header__lead { font-size: 1.05rem; }
}

/* ── Tables ── */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  line-height: 1.5;
}
.article-body thead {
  border-bottom: 2px solid var(--accent, #7c5cfc);
}
.article-body th {
  text-align: left;
  padding: 0.6rem 0.8rem;
  font-weight: 600;
  color: var(--text-bright);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.article-body td {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--border, #1e1e2e);
  color: var(--text);
}
.article-body tbody tr:hover {
  background: var(--bg-card-alt, #1a1a28);
}
.article-body table code {
  font-size: 0.85em;
  padding: 0.1em 0.35em;
  background: var(--bg-card-alt, #1a1a28);
  border-radius: 3px;
}

/* ── Mermaid Diagrams ── */
pre.mermaid {
  background: transparent;
  border: 1px solid var(--border, #2a2a3a);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  text-align: center;
  overflow-x: auto;
}
pre.mermaid svg {
  max-width: 100%;
  height: auto;
}
/* Flowcharts: constrain width so they don't dominate */
pre.mermaid:has(.flowchart) svg,
pre.mermaid:has([id^="flowchart"]) svg {
  max-width: 70%;
  margin: 0 auto;
}
/* State diagrams: also constrain */
pre.mermaid:has(.statediagram) svg,
pre.mermaid:has([id^="state"]) svg {
  max-width: 75%;
  margin: 0 auto;
}
/* Sequence diagrams: give them room */
pre.mermaid:has(.sequenceDiagram) svg,
pre.mermaid:has([id^="sequence"]) svg {
  max-width: 100%;
  min-width: 600px;
}

/* ── Audience Badges ── */
.badge {
  display: inline-block;
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.15em 0.5em;
  border-radius: 3px;
  margin-left: 0.3rem;
  vertical-align: middle;
}
.badge--audience {
  background: var(--accent);
  color: #fff;
  opacity: 0.75;
}
.badge--draft {
  background: var(--callout-warn-border);
  color: #fff;
}

/* ── Prerequisite Callout ── */
.prereq-callout {
  background: var(--bg-card-alt, var(--bg-card));
  border-left: 3px solid var(--accent);
  padding: 0.8rem 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
}
.prereq-callout__label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.3rem;
}
.prereq-callout ul {
  margin: 0;
  padding-left: 1.2rem;
}
.prereq-callout li {
  margin-bottom: 0.2rem;
}
.prereq-callout a {
  color: var(--accent);
}