/* ============================================
   DECILION — Article Styles
   Shared across all insight articles
   Depends on: style.css (Design System v4.1)
   ============================================ */

/* =============================================
   READING PROGRESS BAR
   ============================================= */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--teal), var(--teal-dark));
  z-index: 200;
  transition: width 0.1s linear;
}

/* =============================================
   ARTICLE HERO — Split Layout
   ============================================= */
.article-hero {
  padding: var(--sp-11) 0 var(--sp-10);
  border-bottom: 1px solid var(--warm-border-light);
}

.article-hero__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: var(--sp-10);
  align-items: center;
}

.article-hero__text {
  display: flex;
  flex-direction: column;
}

.article-hero__desk {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--ink-3);
  margin-bottom: var(--sp-1);
}

.article-hero__series {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--orange);
  margin-bottom: var(--sp-3);
}

.article-hero__title {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: var(--sp-5);
}

.article-hero__rule {
  width: var(--sp-11);
  height: 3px;
  background: linear-gradient(90deg, var(--teal), var(--green), var(--purple), var(--orange), var(--yellow));
  border: none;
  border-radius: 2px;
  margin-bottom: var(--sp-5);
}

.article-hero__lead {
  font-size: var(--fs-body-xl);
  font-weight: 300;
  line-height: 1.75;
  color: var(--ink-2);
  margin-bottom: var(--sp-6);
}

.article-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
  font-size: var(--fs-body-sm);
  color: var(--ink-2);
}

.article-hero__author {
  font-weight: 600;
  color: var(--navy);
}
.article-hero__author:hover { color: var(--teal); }

.article-hero__role {
  font-weight: 400;
  color: var(--ink-3);
}

.article-hero__avatar {
  width: var(--sp-7);
  height: var(--sp-7);
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 1px solid var(--warm-border);
}

.article-hero__sep {
  color: var(--ink-3);
}

.article-hero__lang-tags {
  display: flex;
  gap: 6px;
}

.article-hero__lang-tag {
  font-size: var(--fs-xs);
  font-weight: 600;
  padding: 2px var(--sp-2);
  border-radius: var(--radius-sm);
  background: var(--cream-dark);
  color: var(--ink-2);
}

.article-hero__image {
  position: relative;
}

.article-hero__img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: block;
}

/* =============================================
   ARTICLE LAYOUT — Body + TOC Sidebar
   ============================================= */
.article-layout {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--sp-9);
  position: relative;
}

/* TOC Sidebar */
.toc-sidebar {
  position: relative;
  padding-top: var(--sp-9);
}

.toc-sidebar__inner {
  position: sticky;
  top: var(--sp-12);
}

.toc-sidebar__label {
  font-size: var(--fs-2xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  margin-bottom: var(--sp-4);
  padding-left: var(--sp-4);
}

.toc-sidebar__list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--warm-border);
}

.toc-sidebar__link {
  display: block;
  font-size: var(--fs-caption);
  font-weight: 400;
  color: var(--ink-3);
  padding: 6px var(--sp-4);
  line-height: 1.4;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color 0.2s, border-left-color 0.2s;
}
.toc-sidebar__link:hover { color: var(--ink); }

.toc-sidebar__link--active {
  color: var(--teal-dark);
  font-weight: 600;
  border-left-color: var(--teal);
}

.toc-sidebar__back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-caption);
  font-weight: 600;
  color: var(--teal);
  margin-top: var(--sp-6);
  padding-left: var(--sp-4);
  transition: color 0.2s;
}
.toc-sidebar__back:hover { color: var(--teal-dark); }

/* =============================================
   ARTICLE BODY — Typography
   ============================================= */
.article-body {
  max-width: 720px;
  padding: var(--sp-9) 0 60px;
}

.article-body h2 {
  font-family: var(--serif);
  font-size: var(--fs-heading-md);
  font-weight: 700;
  color: var(--navy);
  margin: var(--sp-11) 0 var(--sp-6);
  line-height: 1.25;
  border-top: 3px solid var(--teal);
  padding-top: var(--sp-6);
}

.article-body h2:first-of-type {
  margin-top: var(--sp-9);
}

.article-body h3 {
  font-family: var(--serif);
  font-size: var(--fs-body-2xl);
  font-weight: 700;
  color: var(--navy);
  margin: 36px 0 var(--sp-4);
  line-height: 1.3;
}

.article-body p {
  font-size: var(--fs-body-lg);
  line-height: 1.8;
  margin-bottom: var(--sp-6);
}

/* Lead paragraph */
.article-body p.lead-paragraph {
  font-size: var(--fs-body-xl);
  line-height: 1.85;
}

/* Drop cap */
.article-body p.lead-paragraph::first-letter {
  float: left;
  font-family: var(--serif);
  font-size: 3.75rem;
  font-weight: 700;
  line-height: 0.8;
  color: var(--navy);
  padding-right: 10px;
  padding-top: 6px;
}

/* Footnote superscripts */
.article-body sup a {
  color: var(--teal);
  text-decoration: none;
  font-size: 0.7em;
  font-weight: 600;
}
.article-body sup a:hover { text-decoration: underline; }

/* =============================================
   STAT CALLOUTS
   ============================================= */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--sp-3);
  margin: 28px 0 var(--sp-7);
}

.stat-box {
  border-radius: var(--radius-lg);
  padding: var(--sp-4) 18px;
  text-align: center;
}

.stat-box--teal {
  background: rgba(0,181,180,0.08);
  border-left: 3px solid var(--teal);
}
.stat-box--navy {
  background: rgba(27,42,74,0.06);
  border-left: 3px solid var(--navy);
}
.stat-box--orange {
  background: rgba(247,148,29,0.08);
  border-left: 3px solid var(--orange);
}
.stat-box--green {
  background: rgba(76,175,80,0.08);
  border-left: 3px solid var(--green);
}

.stat-box__number {
  font-family: var(--serif);
  font-size: var(--fs-heading-sm);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.2;
  margin-bottom: var(--sp-1);
}

.stat-box__label {
  font-size: var(--fs-caption);
  color: var(--ink-2);
  line-height: 1.4;
}

/* =============================================
   CHART EMBEDS — Break out of reading column
   ============================================= */
.chart-embed {
  margin: var(--sp-7) -60px;
  max-width: calc(100% + 120px);
}

.chart-embed iframe {
  width: 100%;
  border: none;
}

.chart-caption {
  font-size: var(--fs-caption);
  color: var(--ink-3);
  text-align: center;
  padding: var(--sp-2) 60px 0;
  line-height: 1.5;
}

/* =============================================
   KEY TAKEAWAY CALLOUT
   ============================================= */
.takeaway-box {
  background: rgba(0,181,180,0.06);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius-md);
  padding: var(--sp-6) 28px;
  margin: 28px 0 36px;
}

.takeaway-box__heading {
  font-family: var(--serif);
  font-size: var(--fs-body-lg);
  font-weight: 700;
  color: var(--teal);
  margin: 0 0 var(--sp-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.takeaway-box p {
  font-size: var(--fs-body);
  line-height: 1.75;
  margin-bottom: 0;
}

/* =============================================
   PULL QUOTES
   ============================================= */
.pull-quote {
  margin: var(--sp-8) 0;
  padding: var(--sp-6) var(--sp-7);
  border-left: 4px solid var(--teal);
  background: rgba(0,181,180,0.03);
}

.pull-quote__text {
  font-family: var(--serif);
  font-style: italic;
  font-size: var(--fs-body-2xl);
  line-height: 1.65;
  color: var(--navy);
  margin: 0;
}

/* =============================================
   SECTION DIVIDERS — Brand dot motif
   ============================================= */
.section-dots {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--sp-2);
  margin: var(--sp-9) 0 var(--sp-4);
}

.section-dots__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
}

.section-dots__dot:nth-child(1) { background: var(--teal); }
.section-dots__dot:nth-child(2) { background: var(--green); }
.section-dots__dot:nth-child(3) { background: var(--purple); }
.section-dots__dot:nth-child(4) { background: var(--orange); }
.section-dots__dot:nth-child(5) { background: var(--yellow); }

/* =============================================
   AUTHOR BOX
   ============================================= */
.author-box {
  display: flex;
  gap: var(--sp-6);
  background: var(--cream-dark);
  border: 1px solid var(--warm-border);
  border-radius: var(--radius-xl);
  padding: var(--sp-7);
  margin: var(--sp-9) 0 var(--sp-8);
  align-items: flex-start;
  position: relative;
  overflow: hidden;
}

.author-box__sketch {
  width: 100px;
  height: 100px;
  border-radius: var(--radius-full);
  object-fit: cover;
  flex-shrink: 0;
  border: none;
  background: var(--cream-dark);
}

.author-box__label {
  font-size: var(--fs-2xs);
  font-weight: 500;
  color: var(--ink-3);
  margin-bottom: 2px;
}

.author-box__name {
  font-family: var(--serif);
  font-size: var(--fs-body-2xl);
  font-weight: 700;
  margin-bottom: 0;
  line-height: 1.3;
}

.author-box__name a {
  color: var(--navy);
}
.author-box__name a:hover { color: var(--teal); }

.author-box__title {
  font-size: var(--fs-nav);
  color: var(--ink-3);
  margin-bottom: var(--sp-2);
}

.author-box__bio {
  font-size: var(--fs-nav);
  color: var(--ink-2);
  line-height: 1.55;
  margin-bottom: 10px;
}

.author-box__bubbles {
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 100%;
  pointer-events: none;
}

.author-box__bubble {
  position: absolute;
  border-radius: var(--radius-full);
  opacity: 0.1;
}

.author-box__links {
  display: flex;
  gap: var(--sp-5);
  align-items: center;
}

.author-box__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-nav);
  font-weight: 500;
  color: var(--ink-2);
}
.author-box__link:hover { color: var(--teal); }

.author-box__substack {
  font-size: var(--fs-nav);
  font-weight: 600;
  color: var(--teal-dark);
}
.author-box__substack:hover { color: var(--navy); }

/* =============================================
   REFERENCES — Collapsible accordion
   ============================================= */
.references {
  margin-top: var(--sp-9);
  border-top: 1px solid var(--warm-border);
}

.references__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--sp-5) 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.references__toggle h2 {
  font-size: var(--fs-body-2xl);
  color: var(--navy);
  margin: 0;
  border: none;
  padding: 0;
}

.references__count {
  font-weight: 400;
  color: var(--ink-3);
  font-size: var(--fs-body-sm);
}

.references__chevron {
  transition: transform 0.3s var(--ease);
  color: var(--ink-3);
}

.references__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease);
}

.references--open .references__body {
  max-height: 1500px;
}

.references--open .references__chevron {
  transform: rotate(180deg);
}

.references ol {
  font-size: var(--fs-nav);
  color: var(--ink-3);
  line-height: 1.7;
  padding-left: var(--sp-6);
}

.references ol li {
  margin-bottom: var(--sp-2);
}

.references a {
  color: var(--teal-dark);
  word-break: break-all;
}

/* =============================================
   MORE ARTICLES
   ============================================= */
.more-articles {
  margin-top: var(--sp-8);
  padding-top: var(--sp-7);
  border-top: 1px solid var(--warm-border);
}

.more-articles__label {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  margin-bottom: var(--sp-4);
}

.more-articles__card {
  display: grid;
  grid-template-columns: 1fr 280px;
  background: var(--white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--warm-border);
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease), transform 0.3s var(--ease);
  overflow: hidden;
}

.more-articles__card:hover {
  border-color: var(--teal);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.more-articles__img {
  width: 100%;
  height: 100%;
  min-height: 180px;
  object-fit: cover;
  order: 2;
}

.more-articles__text {
  padding: 28px var(--sp-7);
  display: flex;
  flex-direction: column;
  justify-content: center;
  order: 1;
}

.more-articles__series {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--teal);
  margin-bottom: var(--sp-2);
}

.more-articles__card-title {
  font-family: var(--serif);
  font-size: var(--fs-heading-xs);
  font-weight: 700;
  color: var(--navy);
  line-height: 1.25;
  margin-bottom: var(--sp-2);
}

.more-articles__excerpt {
  font-size: var(--fs-nav);
  color: var(--ink-2);
  line-height: 1.55;
  margin-bottom: var(--sp-2);
}

.more-articles__card-meta {
  font-size: var(--fs-caption);
  color: var(--ink-3);
}

.more-articles__read {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  font-size: var(--fs-nav);
  font-weight: 600;
  color: var(--teal-dark);
  margin-top: 6px;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
  .article-hero__inner {
    grid-template-columns: 1fr 340px;
    gap: var(--sp-8);
  }
  .article-hero__img { height: 400px; }
  .article-layout {
    grid-template-columns: 180px 1fr;
    gap: var(--sp-7);
  }
}

@media (max-width: 768px) {
  .reading-progress { display: none; }

  .article-hero { padding: var(--sp-8) 0 36px; }
  .article-hero__inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .article-hero__image { order: -1; }
  .article-hero__img {
    height: 240px;
    border-radius: var(--radius-md);
  }

  .article-layout { grid-template-columns: 1fr; }
  .toc-sidebar { display: none; }
  .article-body { padding-top: var(--sp-7); }

  .chart-embed {
    margin: var(--sp-6) -16px;
    max-width: calc(100% + 32px);
  }
  .chart-caption { padding: var(--sp-2) var(--sp-4) 0; }

  .pull-quote {
    margin: var(--sp-7) 0;
    padding: var(--sp-5) var(--sp-5);
  }
  .pull-quote__text { font-size: 1.05rem; }

  .takeaway-box { padding: var(--sp-5) var(--sp-5); }

  .author-box { flex-direction: column; align-items: center; text-align: center; }
  .author-box__links { justify-content: center; }

  .more-articles__card { grid-template-columns: 1fr; }
  .more-articles__img { order: -1; min-height: 160px; }
  .more-articles__text { order: 1; }
}

@media (max-width: 600px) {
  .stat-grid { grid-template-columns: 1fr; }
  .article-hero__title { font-size: 1.5rem; }
}