/* =========================================================
   CredibilityOS — Article (long-form pillar pages)
   Layered on top of /styles.css. Reuses tokens, nav, footer,
   buttons, eyebrow, last-updated. Adds: article hero, sticky
   TOC, reading-rhythm typography, callouts, evidence tiers.
   ========================================================= */

/* -------- Article hero (compact, reading-first) -------- */
.article-hero {
  padding: clamp(64px, 8vw, 120px) 0 var(--space-12);
  border-bottom: 1px solid var(--color-border);
}

.article-hero__inner {
  max-width: 70ch;
}

.article-hero__title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: clamp(2rem, 1.2rem + 2.6vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: var(--space-4) 0 var(--space-6);
  text-wrap: balance;
}

.article-hero__lede {
  color: var(--color-text-secondary);
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.25rem);
  line-height: 1.55;
  margin: 0 0 var(--space-8);
  max-width: 60ch;
}

/* -------- Article meta strip -------- */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-6);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.article-meta__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.article-meta__item strong {
  color: var(--color-text-primary, #111827);
  font-weight: 500;
}

/* -------- TOC + body grid -------- */
.toc-grid {
  display: grid;
  /* minmax(0, 1fr) (not bare 1fr) so the single mobile column can shrink below
     the TOC's max-content width — otherwise long TOC labels force horizontal
     overflow on narrow screens. */
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-12);
  padding: var(--space-16) 0 var(--space-20);
}

@media (min-width: 1024px) {
  .toc-grid {
    grid-template-columns: 220px 1fr;
    gap: var(--space-16);
  }
}

.toc {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

@media (min-width: 1024px) {
  .toc {
    position: sticky;
    top: var(--space-20);
    align-self: start;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }
}

.toc__label {
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-4);
  letter-spacing: 0.16em;
}

.toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-3);
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-4);
}

.toc__link {
  display: block;
  color: var(--color-text-secondary);
  text-decoration: none;
  letter-spacing: 0.12em;
  line-height: 1.4;
  transition: color 200ms ease;
}

.toc__link:hover,
.toc__link:focus-visible {
  color: var(--color-primary);
}

.toc__link[data-active="true"] {
  color: var(--color-text-primary, #111827);
  font-weight: 500;
}

.toc__num {
  display: inline-block;
  margin-right: 8px;
  color: var(--color-primary);
  font-weight: 500;
}

/* -------- Article body typography -------- */
.article-body {
  max-width: 68ch;
  font-size: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
  line-height: 1.7;
  color: #1f2937;
}

.article-body > section + section {
  margin-top: var(--space-16);
}

.article-body h2 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-6);
  scroll-margin-top: 100px;
}

.article-body h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
  line-height: 1.3;
  margin: var(--space-10) 0 var(--space-3);
  scroll-margin-top: 100px;
}

.article-body p {
  margin: 0 0 var(--space-5);
}

.article-body p + p {
  margin-top: 0;
}

.article-body strong {
  color: #111827;
  font-weight: 600;
}

.article-body ul {
  margin: 0 0 var(--space-5);
  padding-left: var(--space-6);
}

.article-body ul li {
  margin-bottom: var(--space-3);
}

/* Inline prose links only — exclude buttons so .btn styling wins. */
.article-body a:not(.btn) {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.article-body a:not(.btn):hover,
.article-body a:not(.btn):focus-visible {
  text-decoration-thickness: 2px;
}

/* -------- Section eyebrow + number -------- */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-tag__num {
  font-weight: 500;
}

.section-tag__divider {
  width: 24px;
  height: 1px;
  background: currentColor;
  opacity: 0.4;
}

/* -------- Pull-out callouts -------- */
.callout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-5);
  align-items: baseline;
  padding: var(--space-6);
  margin: var(--space-8) 0;
  background: var(--color-bg-soft, #fafafa);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 8px 8px 0;
}

.callout__num {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: clamp(2rem, 1.2rem + 2vw, 3rem);
  line-height: 1;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.callout__body {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

.callout__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

/* -------- Evidence tier badges -------- */
.tier-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin: var(--space-6) 0 var(--space-8);
  padding: 0;
  list-style: none;
}

@media (min-width: 720px) {
  .tier-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.tier {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: #ffffff;
}

.tier__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 4px;
  margin-bottom: var(--space-3);
}

.tier__body {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
}

.tier--fact .tier__badge {
  background: rgba(234, 88, 12, 0.1);
  color: var(--color-primary);
}

.tier--inference .tier__badge {
  background: rgba(75, 85, 99, 0.1);
  color: #4b5563;
}

.tier--assumption .tier__badge {
  background: rgba(75, 85, 99, 0.06);
  color: #6b7280;
}

.tier--speculation .tier__badge {
  background: rgba(75, 85, 99, 0.04);
  color: #9ca3af;
}

/* -------- Section divider ornament -------- */
.section-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: var(--space-16) 0;
  color: var(--color-border-strong);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.4em;
}

.section-divider::before,
.section-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
  max-width: 80px;
  margin: 0 var(--space-4);
}

/* -------- Closer block (final CTA) -------- */
.closer {
  margin-top: var(--space-20);
  padding: clamp(40px, 6vw, 80px);
  background: var(--color-surface);
  color: #ffffff;
  border-radius: 12px;
  position: relative;
  overflow: hidden;
}

.closer::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    ellipse 70% 80% at 80% 30%,
    rgba(234, 88, 12, 0.18),
    transparent 60%
  );
  pointer-events: none;
}

.closer__inner {
  position: relative;
  max-width: 56ch;
}

.closer__eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.closer__title {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: clamp(1.5rem, 1rem + 1.6vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 var(--space-5);
  color: #ffffff;
  text-wrap: balance;
}

.closer__body {
  color: rgba(255, 255, 255, 0.78);
  font-size: 1rem;
  line-height: 1.6;
  margin: 0 0 var(--space-8);
}

.closer__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.closer .btn--ghost-on-dark {
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: transparent;
  color: #ffffff;
}

.closer .btn--ghost-on-dark:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.4);
}

.closer__meta {
  margin-top: var(--space-6);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
}

/* -------- Disclosure footnotes -------- */
.disclosure {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--color-text-secondary);
  font-style: italic;
}

.disclosure p + p {
  margin-top: var(--space-3);
}

/* =========================================================
   Dark theme (data-theme="dark")
   Token-driven rules (--color-bg-soft, --color-surface,
   --color-text-secondary, --color-border, --color-primary) flip
   automatically via styles.css. Only the values article.css
   hard-codes for light need restating here.
   ========================================================= */
[data-theme="dark"] .article-body {
  color: #cfd5dd;
}
[data-theme="dark"] .article-body h2,
[data-theme="dark"] .article-body h3 {
  color: var(--color-text-primary);
}
[data-theme="dark"] .article-body strong {
  color: var(--color-text-primary);
}

/* Evidence tiers: white card → dark surface; badge text lifted for
   readable contrast on the dark surface. */
[data-theme="dark"] .tier {
  background: var(--color-surface);
}
[data-theme="dark"] .tier--fact .tier__badge {
  background: var(--color-primary-100);
}
[data-theme="dark"] .tier--inference .tier__badge {
  background: rgba(255, 255, 255, 0.08);
  color: #c2c8d0;
}
[data-theme="dark"] .tier--assumption .tier__badge {
  background: rgba(255, 255, 255, 0.06);
  color: #a7aeb8;
}
[data-theme="dark"] .tier--speculation .tier__badge {
  background: rgba(255, 255, 255, 0.045);
  color: #8b929c;
}

/* Closer: add a hairline against the page and retint the hero glow
   from orange to copper. */
[data-theme="dark"] .closer {
  border: 1px solid var(--color-border);
}
[data-theme="dark"] .closer::before {
  background: radial-gradient(
    ellipse 70% 80% at 80% 30%,
    rgba(204, 128, 102, 0.2),
    transparent 60%
  );
}

/* -------- Print -------- */
@media print {
  .toc,
  .nav,
  .footer,
  .closer {
    display: none;
  }
  .article-body {
    max-width: 100%;
  }
}