/* ═══════════════════════════════════════════════════════════════
   blog.css — Phase 2 · Swiss Modernism 2.0 · Stripe token system
   All colours/spacing/radii/type from tokens.css. No raw hex.
   ══════════════════════════════════════════════════════════════ */

/* ── Reset / base ─────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* ── Accessibility ─────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  z-index: 9999;
  transition: top var(--duration-fast);
  text-decoration: none;
}
.skip-link:focus {
  top: var(--space-4);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Blog Nav ──────────────────────────────────────────────── */
.blog-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-xs);
}

.blog-nav__inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
}

.blog-nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.blog-nav__logo-mark {
  width: 32px;
  height: 32px;
  background: var(--gradient-brand);
  border-radius: var(--radius-md);
  color: var(--color-primary-contrast);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.blog-nav__logo-text {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.blog-nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
  overflow-x: auto;
}

.blog-nav__link {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--duration-fast), color var(--duration-fast);
}
.blog-nav__link:hover,
.blog-nav__link--active {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.blog-nav__cta {
  margin-left: auto;
  flex-shrink: 0;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: background-color var(--duration-fast), transform var(--duration-fast);
}
.blog-nav__cta:hover {
  background: var(--color-primary-hover);
  transform: translateY(var(--motion-lift));
}

/* ── Breadcrumb ─────────────────────────────────────────────── */
.blog-breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6) 0;
}

.blog-breadcrumb__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--font-size-sm);
}

.blog-breadcrumb__link {
  color: var(--color-text-secondary);
  text-decoration: none;
}
.blog-breadcrumb__link:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.blog-breadcrumb__sep {
  color: var(--color-text-tertiary);
  user-select: none;
}

.blog-breadcrumb__current {
  color: var(--color-text-tertiary);
  max-width: 30ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Blog Main wrapper ──────────────────────────────────────── */
.blog-main {
  min-height: 60vh;
}

.blog-main-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6) var(--space-16);
}

/* ── Blog Article Layout ────────────────────────────────────── */
.blog-article-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-10);
  max-width: 1200px;
  margin: var(--space-8) auto 0;
  padding: 0 var(--space-6) var(--space-16);
  align-items: start;
}

/* ── ToC Sidebar ───────────────────────────────────────────── */
.blog-toc-sidebar {
  position: sticky;
  top: calc(64px + var(--space-6));
  max-height: calc(100vh - 64px - var(--space-12));
  overflow-y: auto;
}

.blog-toc {
  background: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.blog-toc__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-3);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.blog-toc__toggle {
  display: none; /* visible only on mobile via media query */
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  text-align: left;
  margin-bottom: var(--space-3);
}
.blog-toc__toggle:hover {
  background: var(--color-surface-subtle);
}

.blog-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.blog-toc__item {
  /* default: H2 level */
}
.blog-toc__item--sub {
  padding-left: var(--space-4); /* indent H3 */
}

.blog-toc__link {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  line-height: 1.4;
  transition: color var(--duration-fast), background-color var(--duration-fast);
}
.blog-toc__link:hover,
.blog-toc__link--active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ── Article ────────────────────────────────────────────────── */
.blog-article {
  min-width: 0; /* prevent grid blowout */
  max-width: 72ch;
}

/* ── Article Header ─────────────────────────────────────────── */
.blog-article__header {
  margin-bottom: var(--space-8);
}

.blog-article__eyebrow {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-bottom: var(--space-4);
  transition: background-color var(--duration-fast);
}
.blog-article__eyebrow:hover {
  background: var(--color-primary-border);
}

.blog-article__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
  letter-spacing: var(--tracking-tight);
  margin: 0 0 var(--space-4);
}

.blog-article__subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  margin: 0 0 var(--space-6);
}

.blog-article__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

.blog-article__author {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}

.blog-article__meta-sep {
  color: var(--color-text-tertiary);
  user-select: none;
}

/* AI-estimated badge */
.blog-ai-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-ai-light);
  border: 1px solid var(--color-ai-border);
  color: var(--color-ai);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: default;
}

/* Tags inline in meta */
.blog-tag {
  display: inline-block;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ── Hero Image ─────────────────────────────────────────────── */
.blog-article__hero {
  margin: 0 0 var(--space-8);
}

.blog-article__hero-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  display: block;
}

/* ── Article Body Prose ─────────────────────────────────────── */
.blog-article__body {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text-primary);
}

.blog-article__body > * + * {
  margin-top: var(--space-6);
}

/* Standard prose elements */
.blog-p {
  margin: 0;
}

.blog-h2,
.blog-article__body h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
  margin: var(--space-10) 0 var(--space-4);
}

.blog-h3,
.blog-article__body h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
  margin: var(--space-8) 0 var(--space-3);
}

.blog-h4,
.blog-article__body h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: var(--space-6) 0 var(--space-2);
}

/* Section anchor link — invisible until hover */
.blog-anchor {
  color: inherit;
  text-decoration: none;
}
.blog-anchor:hover::after {
  content: ' #';
  color: var(--color-primary);
  font-weight: var(--font-weight-normal);
}

/* Lists */
.blog-article__body ul,
.blog-article__body ol {
  padding-left: var(--space-6);
  margin: 0;
}
.blog-article__body li {
  margin-top: var(--space-2);
}

/* Links in prose */
.blog-article__body a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.blog-article__body a:hover {
  color: var(--color-primary-hover);
}

/* Divider */
.blog-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

/* ── Inline text marks ─────────────────────────────────────── */
.blog-inline-code {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  padding: 1px var(--space-1);
  border-radius: var(--radius-sm);
}

.blog-hl {
  background: var(--color-primary-light);
  border-radius: var(--radius-sm);
  padding: 0 2px;
}

.blog-kw {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

/* ── Callout ────────────────────────────────────────────────── */
.blog-callout {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  border-width: 1px;
  border-style: solid;
}

.blog-callout--info {
  background: var(--color-status-info-bg);
  border-color: var(--color-status-info-border);
  color: var(--color-status-info-text);
}
.blog-callout--tip {
  background: var(--color-band-leading-bg);
  border-color: var(--color-band-leading-border);
  color: var(--color-band-leading);
}
.blog-callout--warning {
  background: var(--color-status-warning-bg);
  border-color: var(--color-status-warning-border);
  color: var(--color-status-warning-text);
}
.blog-callout--success {
  background: var(--color-status-success-bg);
  border-color: var(--color-status-success-border);
  color: var(--color-status-success-text);
}

.blog-callout__icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: flex-start;
  padding-top: 2px;
}

.blog-callout__body {
  flex: 1;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

/* ── Quote ──────────────────────────────────────────────────── */
.blog-quote {
  border-left: 4px solid var(--color-primary);
  padding-left: var(--space-6);
  margin: 0;
}

.blog-quote blockquote {
  font-size: var(--font-size-xl);
  font-style: italic;
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

.blog-quote__attribution {
  margin-top: var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  font-style: normal;
}

/* ── FAQ ────────────────────────────────────────────────────── */
.blog-faq {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.blog-faq__item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.blog-faq__q {
  list-style: none;
  padding: var(--space-4);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  transition: background-color var(--duration-fast), color var(--duration-fast);
}
.blog-faq__q::-webkit-details-marker { display: none; }
.blog-faq__q::marker { display: none; }
.blog-faq__q:hover {
  background: var(--color-surface-subtle);
}
details[open] .blog-faq__q {
  color: var(--color-primary);
  background: var(--color-primary-light);
}
.blog-faq__q::after {
  content: '+';
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-normal);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}
details[open] .blog-faq__q::after {
  content: '−';
  color: var(--color-primary);
}

.blog-faq__a {
  padding: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  border-top: 1px solid var(--color-border);
}

/* ── Code ───────────────────────────────────────────────────── */
.blog-code-wrap {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.blog-code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-inset);
  border-bottom: 1px solid var(--color-border);
}

.blog-code-lang {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.blog-code-copy {
  padding: 2px var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: background-color var(--duration-fast), color var(--duration-fast);
}
.blog-code-copy:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary-border);
}

.blog-pre {
  margin: 0;
  padding: var(--space-4);
  background: var(--color-surface-inset);
  overflow-x: auto;
}
.blog-pre code {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
  line-height: 1.6;
  color: var(--color-text-primary);
}

/* ── Table ──────────────────────────────────────────────────── */
.blog-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.blog-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.blog-table th {
  background: var(--color-surface-elevated);
  font-weight: var(--font-weight-semibold);
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 2px solid var(--color-border-strong);
  color: var(--color-text-primary);
  white-space: nowrap;
}

.blog-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.blog-table tbody tr:nth-child(even) {
  background: var(--color-surface-elevated);
}
.blog-table tbody tr:last-child td {
  border-bottom: none;
}

/* ── Checklist ──────────────────────────────────────────────── */
.blog-checklist {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.blog-checklist__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.blog-checklist__icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 2px;
  color: var(--color-text-tertiary);
}
.blog-checklist__item--checked .blog-checklist__icon {
  color: var(--color-band-leading);
}
.blog-checklist__item--checked span:last-child {
  color: var(--color-text-tertiary);
  text-decoration: line-through;
}

/* ── Stat ───────────────────────────────────────────────────── */
.blog-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface-elevated);
}

.blog-stat__value {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.blog-stat__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-2);
}

.blog-stat__trend {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
  margin-top: var(--space-2);
}
.blog-stat__trend--up   { color: var(--color-band-leading); }
.blog-stat__trend--down { color: var(--color-band-at-risk); }
.blog-stat__trend--flat { color: var(--color-text-tertiary); }

/* ── Key Takeaways ──────────────────────────────────────────── */
.blog-takeaways {
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-light);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: var(--space-5) var(--space-6);
}

.blog-takeaways__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-3);
}

.blog-takeaways__list {
  margin: 0;
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.blog-takeaways__list li {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

/* ── Image / figure ─────────────────────────────────────────── */
.blog-figure {
  margin: 0;
}

.blog-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  display: block;
}

.blog-fig-caption {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  text-align: center;
  margin-top: var(--space-2);
}

/* ── CTA block ──────────────────────────────────────────────── */
.blog-cta {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  background: var(--color-surface-elevated);
}

.blog-cta__text {
  margin: 0 0 var(--space-4);
  color: var(--color-text-secondary);
  font-size: var(--font-size-body);
}

.blog-cta__btn {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: background-color var(--duration-fast), transform var(--duration-fast);
}
.blog-cta__btn:hover {
  background: var(--color-primary-hover);
  transform: translateY(var(--motion-lift));
}

/* ── Author Box ─────────────────────────────────────────────── */
.blog-article__author-box {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-6);
  margin-top: var(--space-10);
}

.blog-article__author-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  border: 2px solid var(--color-primary-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  flex-shrink: 0;
}

.blog-article__author-name {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-1);
}

.blog-article__author-bio {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: var(--line-height-relaxed);
}

/* ── Tags footer ────────────────────────────────────────────── */
.blog-article__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.blog-tag-link {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: background-color var(--duration-fast), color var(--duration-fast);
}
.blog-tag-link:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-color: var(--color-primary-border);
}

/* ── Related Articles ───────────────────────────────────────── */
.blog-related {
  background: var(--color-surface-elevated);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0;
}

.blog-related__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.blog-related__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-8);
}

.blog-related__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

/* ── Blog card (shared: index, category, related) ───────────── */
.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--duration-normal), transform var(--duration-normal);
  display: flex;
  flex-direction: column;
}
.blog-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(var(--motion-lift));
}

.blog-card__image-wrap {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.blog-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--duration-slow);
}
.blog-card:hover .blog-card__image {
  transform: scale(1.03);
}

.blog-card__body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  flex: 1;
}

.blog-card__category {
  display: inline-block;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  align-self: flex-start;
}

.blog-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card__title-link {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--duration-fast);
}
.blog-card__title-link:hover {
  color: var(--color-primary);
}

.blog-card__excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-top: auto;
}

/* ── Blog index / category grid ─────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  padding: var(--space-6) 0;
}

.blog-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--space-12);
  color: var(--color-text-tertiary);
}

/* ── Blog hero ──────────────────────────────────────────────── */
.blog-hero {
  background: var(--gradient-hero);
  padding: var(--space-16) var(--space-6);
}

.blog-hero__inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}

.blog-hero__title {
  font-size: var(--font-size-display-2);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin: 0 0 var(--space-4);
  line-height: var(--line-height-tight);
}

.blog-hero__subtitle {
  font-size: var(--font-size-lg);
  color: rgb(255 255 255 / 0.75);
  margin: 0;
  line-height: var(--line-height-relaxed);
}

/* ── Category header ────────────────────────────────────────── */
.blog-category-header {
  background: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-10) var(--space-6);
}

.blog-category-header__inner {
  max-width: 1200px;
  margin: 0 auto;
}

.blog-category-header__back {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  margin-bottom: var(--space-3);
  transition: color var(--duration-fast);
}
.blog-category-header__back:hover {
  color: var(--color-primary);
}

.blog-category-header__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-2);
}

.blog-category-header__description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin: 0;
}

/* ── Category pills ─────────────────────────────────────────── */
.blog-category-pills {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.blog-category-pill {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--duration-fast), color var(--duration-fast),
              border-color var(--duration-fast);
}
.blog-category-pill:hover,
.blog-category-pill--active {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  border-color: var(--color-primary);
}

/* ── Pagination ─────────────────────────────────────────────── */
.blog-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-8) 0;
}

.blog-pagination__btn {
  display: inline-block;
  padding: var(--space-2) var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: background-color var(--duration-fast), border-color var(--duration-fast),
              color var(--duration-fast);
}
.blog-pagination__btn:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.blog-pagination__info {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* ── Contribution Popup ─────────────────────────────────────── */
.blog-contrib-popup {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  max-width: 320px;
  width: calc(100vw - var(--space-12));
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  z-index: 200;
}
.blog-contrib-popup[hidden] {
  display: none;
}

.blog-contrib-popup__inner {
  padding: var(--space-5);
}

.blog-contrib-popup__text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-4);
  line-height: var(--line-height-relaxed);
}

.blog-contrib-popup__actions {
  display: flex;
  gap: var(--space-2);
}

.blog-contrib-popup__copy {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: none;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: background-color var(--duration-fast);
}
.blog-contrib-popup__copy:hover {
  background: var(--color-primary-hover);
}

.blog-contrib-popup__dismiss {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: background-color var(--duration-fast);
}
.blog-contrib-popup__dismiss:hover {
  background: var(--color-surface-subtle);
}

/* ── Footer ─────────────────────────────────────────────────── */
.blog-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) 0;
  background: var(--color-surface-elevated);
}

.blog-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.blog-footer__copy {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin: 0;
}

.blog-footer__links {
  display: flex;
  gap: var(--space-4);
}
.blog-footer__links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast);
}
.blog-footer__links a:hover {
  color: var(--color-primary);
}

/* ── Dark mode — semantic token overrides from tokens.css apply automatically.
       Verify callout contrast. ───────────────────────────────────────────── */
[data-theme="dark"] .blog-callout--info {
  background: rgba(59, 130, 246, 0.12);
}

/* ── Reduced motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* ── Responsive ─────────────────────────────────────────────── */

/* Mobile — 1-col, no sidebar, show ToC toggle */
@media (max-width: 767px) {
  .blog-article-layout {
    grid-template-columns: 1fr;
    padding: 0 var(--space-4) var(--space-10);
    gap: var(--space-6);
    margin-top: var(--space-4);
  }

  .blog-toc-sidebar {
    position: static;
    max-height: none;
    overflow: visible;
  }

  .blog-toc__toggle {
    display: block;
  }

  .blog-grid,
  .blog-related__grid {
    grid-template-columns: 1fr;
  }

  .blog-nav__links {
    display: none;
  }

  .blog-article__title {
    font-size: 1.75rem;
  }

  .blog-hero {
    padding: var(--space-10) var(--space-4);
  }

  .blog-contrib-popup {
    bottom: var(--space-4);
    right: var(--space-4);
  }

  .blog-footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Tablet — 2-col card grid, no ToC sidebar */
@media (min-width: 768px) and (max-width: 1023px) {
  .blog-article-layout {
    grid-template-columns: 1fr;
    padding: 0 var(--space-6) var(--space-12);
  }

  .blog-toc-sidebar {
    display: none;
  }

  .blog-grid,
  .blog-related__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Desktop — full layout: sticky ToC sidebar, 3-col card grid */
@media (min-width: 1024px) {
  .blog-article-layout {
    grid-template-columns: 240px 1fr;
  }

  .blog-toc__toggle {
    display: none;
  }

  #toc-list {
    display: flex !important; /* override JS hidden state on desktop */
  }
}

/* ═══════════════════════════════════════════════════════════════
   Phase 5 — Engagement widgets
   ═══════════════════════════════════════════════════════════════ */

.blog-engagement-section {
  margin-top: var(--space-6, 1.5rem);
  padding-top: var(--space-6, 1.5rem);
  border-top: 1px solid var(--color-border, #e5e7eb);
}

/* Reaction bar */
.blog-reaction-bar { display: flex; gap: var(--space-3, 0.75rem); flex-wrap: wrap; }
.blog-reaction-btn {
  display: inline-flex; align-items: center; gap: 0.375rem;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full, 9999px);
  background: var(--color-surface);
  font-size: var(--text-sm);
  cursor: pointer; transition: border-color 150ms, background 150ms;
  min-height: 44px; /* touch target */
}
.blog-reaction-btn:hover { border-color: var(--color-primary); }
.blog-reaction-btn--active {
  background: var(--color-primary-light, #eff6ff);
  border-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: 600;
}
.blog-reaction-count { font-variant-numeric: tabular-nums; }

/* Rating */
.blog-rating { display: flex; align-items: center; gap: var(--space-3, 0.75rem); flex-wrap: wrap; }
.blog-rating__avg { font-weight: 600; }
.blog-rating__count { color: var(--color-text-secondary); font-size: var(--text-sm); }
.blog-rating__stars { display: flex; gap: 0.25rem; }
.blog-star-btn {
  background: none; border: none; font-size: 1.5rem; cursor: pointer;
  color: var(--color-border); transition: color 100ms, transform 100ms;
  min-width: 44px; min-height: 44px;
  padding: 0; line-height: 1;
}
.blog-star-btn--filled { color: var(--color-band-competitive, #ca8a04); }
.blog-star-btn--hover  { color: var(--color-band-competitive, #ca8a04); transform: scale(1.15); }

/* Share row */
.blog-share-section { display: flex; align-items: center; gap: var(--space-3, 0.75rem); flex-wrap: wrap; }
.blog-share-label { font-weight: 500; color: var(--color-text-secondary); font-size: var(--text-sm); }
.blog-share-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ── Comments — modern threaded design ──────────────────────── */
.blog-comments-section { margin-top: var(--space-10, 2.5rem); }
.blog-comments__heading {
  font-size: var(--font-size-xl); font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-6, 1.5rem); color: var(--color-text-primary);
  display: flex; align-items: center; gap: var(--space-3);
}
.blog-comments__count {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 1.75rem; height: 1.75rem; padding: 0 var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-surface-subtle); border: 1px solid var(--color-border);
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}
.blog-comments-list {
  display: flex; flex-direction: column; gap: var(--space-4, 1rem);
  margin-bottom: var(--space-8, 2rem);
}
.blog-comment {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0 var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}
.blog-comment:last-child { border-bottom: none; }
.blog-comment__avatar {
  grid-row: 1 / 4;
  width: 2.5rem; height: 2.5rem;
  border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold);
  color: #fff; flex-shrink: 0; user-select: none;
}
.blog-comment__meta {
  display: flex; flex-wrap: wrap; align-items: center;
  gap: var(--space-2); margin-bottom: var(--space-1);
}
.blog-comment__author {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
}
.blog-comment__date {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}
.blog-comment__pending-badge {
  display: inline-flex; align-items: center; gap: 0.25rem;
  padding: 1px var(--space-2); border-radius: var(--radius-full);
  font-size: 10px; font-weight: var(--font-weight-medium);
  background: #fef3c7; border: 1px solid #fbbf24; color: #92400e;
}
.blog-comment__body {
  margin: 0 0 var(--space-2); white-space: pre-line;
  font-size: var(--font-size-sm); line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}
.blog-comment__reply-btn {
  font-size: var(--font-size-xs); font-weight: var(--font-weight-medium);
  color: var(--color-text-tertiary); background: none; border: none;
  padding: 0; cursor: pointer; display: inline-flex; align-items: center; gap: 0.25rem;
  transition: color var(--duration-fast);
}
.blog-comment__reply-btn:hover { color: var(--color-primary); }
.blog-comment__replies {
  grid-column: 2;
  margin-top: var(--space-3);
  padding-left: var(--space-4);
  border-left: 2px solid var(--color-border);
  display: flex; flex-direction: column; gap: 0;
}
/* Nested replies — smaller avatar */
.blog-comment__replies .blog-comment {
  grid-template-columns: 2rem 1fr;
  padding: var(--space-3) 0;
}
.blog-comment__replies .blog-comment__avatar { width: 2rem; height: 2rem; font-size: 11px; }

/* Comment form — modern card */
.blog-comment-form {
  border: 1px solid var(--color-border); border-radius: var(--radius-xl);
  padding: var(--space-6, 1.5rem); background: var(--color-surface);
  box-shadow: var(--shadow-sm); margin-top: var(--space-6, 1.5rem);
}
.blog-comment-form__label {
  font-size: var(--font-size-lg); font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-4, 1rem); color: var(--color-text-primary);
}
.blog-comment-form__char-counter {
  font-size: var(--font-size-xs); color: var(--color-text-tertiary);
  text-align: right; margin-top: var(--space-1);
}
.blog-comment-form__char-counter--warn { color: var(--color-band-at-risk, #dc2626); }
.blog-comment-form__note {
  font-size: var(--font-size-xs); color: var(--color-text-tertiary);
  margin-top: var(--space-3, 0.75rem);
}
.blog-comment-form__success {
  display: none; border: 1px solid var(--color-band-leading, #16a34a);
  border-radius: var(--radius-lg); padding: var(--space-4);
  background: #f0fdf4; color: #166534;
  font-size: var(--font-size-sm); line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}
.blog-comment-form__success--visible { display: block; }

/* ── Comment form fields ─────────────────────────────────────── */
.blog-form-field { display: flex; flex-direction: column; gap: var(--space-1); margin-bottom: var(--space-4); }
.blog-form-label {
  font-size: var(--font-size-sm); font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}
.blog-form-label--optional { font-weight: var(--font-weight-normal); color: var(--color-text-tertiary); }
.blog-form-input,
.blog-form-textarea {
  width: 100%; padding: var(--space-3) var(--space-3-5, 0.875rem);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: var(--color-surface); color: var(--color-text-primary);
  font-size: var(--font-size-sm); font-family: inherit; line-height: var(--line-height-normal);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
  outline: none; box-sizing: border-box;
}
.blog-form-input:focus,
.blog-form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light, #eff6ff);
}
.blog-form-textarea { resize: vertical; min-height: 7rem; }

/* ── AI footnote ─────────────────────────────────────────────── */
.blog-article__ai-footnote {
  margin-top: var(--space-8); padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-xs); color: var(--color-text-tertiary);
  font-style: italic;
}

/* ── Ad slots ────────────────────────────────────────────────── */
.ad-slot {
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; min-height: 90px;
  background: var(--color-surface-subtle);
  border-radius: var(--radius-xl);
}
.ad-slot:empty, .ad-slot:not(:has(*:not(comment))) { display: none; }
.ad-slot--leaderboard {
  max-width: 1200px; margin: var(--space-8) auto;
  padding: 0 var(--space-6); min-height: 90px;
  background: transparent;
}
.ad-slot--leaderboard > * {
  width: 100%; max-width: 728px; min-height: 90px;
  display: flex; align-items: center; justify-content: center;
}
.ad-slot--rectangle {
  max-width: 340px; min-height: 250px;
  margin: var(--space-6) auto;
}
.ad-slot--center { margin-left: auto; margin-right: auto; }
.ad-slot--sidebar {
  width: 100%; min-height: 250px; max-height: 600px;
  margin-top: var(--space-4); border-radius: var(--radius-lg);
  background: var(--color-surface-subtle);
}

/* ── Toast notifications ─────────────────────────────────────── */
.toast-container {
  position: fixed; bottom: var(--space-6); right: var(--space-6);
  z-index: 9000; display: flex; flex-direction: column; gap: var(--space-2);
  pointer-events: none;
}
.toast {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-nav-bg, #0a2540);
  color: #fff;
  font-size: var(--font-size-sm); line-height: var(--line-height-snug);
  box-shadow: var(--shadow-xl);
  max-width: 360px; pointer-events: auto;
  animation: toast-in 200ms ease forwards;
}
.toast--success { background: #166534; }
.toast--error   { background: #991b1b; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

@media (max-width: 767px) {
  .toast-container { left: var(--space-4); right: var(--space-4); bottom: var(--space-4); }
  .toast { max-width: 100%; }
  .ad-slot--leaderboard { min-height: 50px; }
  .blog-comment { grid-template-columns: 2rem 1fr; }
  .blog-comment__avatar { width: 2rem; height: 2rem; font-size: 11px; }
}

@media (prefers-reduced-motion: reduce) {
  .blog-star-btn { transition: none; transform: none !important; }
  .blog-reaction-btn { transition: none; }
}

/* ═══════════════════════════════════════════════════════════════
   PREMIUM OVERHAUL LAYER
   Stripe / Vercel / Linear-grade polish + new components.
   Built on the token system above; later rules intentionally refine
   earlier component defaults. No raw hex — tokens only.
   ══════════════════════════════════════════════════════════════ */

/* ── Reading progress bar (article) ─────────────────────────── */
.blog-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 150;
  background: transparent;
  pointer-events: none;
}
.blog-progress__fill {
  display: block;
  height: 100%;
  width: 100%;
  transform-origin: 0 50%;
  background: var(--gradient-brand);
  will-change: transform;
}

/* ── Nav: frosted glass + theme toggle ──────────────────────── */
.blog-nav {
  background: color-mix(in srgb, var(--color-surface) 82%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
}
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .blog-nav { background: var(--color-surface); }
}

.blog-nav .theme-toggle {
  flex-shrink: 0;
  margin-left: auto; /* anchors the toggle+CTA cluster right, incl. mobile (links hidden) */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: background-color var(--duration-fast), color var(--duration-fast),
              border-color var(--duration-fast);
}
.blog-nav .theme-toggle:hover {
  background: var(--color-surface-subtle);
  color: var(--color-primary);
  border-color: var(--color-primary-border);
}
.blog-nav .theme-toggle svg { width: 18px; height: 18px; }

/* ── Hero: aurora mesh over the navy gradient ───────────────── */
.blog-hero {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-16);
}
.blog-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-aurora-dark);
  opacity: 0.9;
  pointer-events: none;
}
.blog-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
}
.blog-hero__title {
  font-size: var(--font-size-display-1);
  letter-spacing: var(--tracking-tight);
  background: linear-gradient(180deg, #ffffff 0%, rgb(255 255 255 / 0.78) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.blog-hero__subtitle {
  font-size: var(--font-size-xl);
  max-width: 56ch;
  margin-inline: auto;
}

/* ── Featured article (listing) ─────────────────────────────── */
.blog-featured {
  max-width: 1200px;
  margin: var(--space-10) auto 0;
  padding: 0 var(--space-6);
}
.blog-featured__card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--duration-normal), transform var(--duration-normal);
}
.blog-featured__card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(var(--motion-lift));
}
.blog-featured__media {
  position: relative;
  overflow: hidden;
  min-height: 280px;
  background: var(--color-surface-subtle);
}
.blog-featured__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--duration-slow);
}
.blog-featured__card:hover .blog-featured__img { transform: scale(1.04); }
.blog-featured__body {
  padding: var(--space-10);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  justify-content: center;
}
.blog-featured__flag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  align-self: flex-start;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-ai-light);
  border: 1px solid var(--color-ai-border);
  color: var(--color-ai);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}
.blog-featured__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--tracking-tight);
  margin: 0;
}
.blog-featured__title a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--duration-fast);
}
.blog-featured__title a:hover { color: var(--color-primary); }
.blog-featured__excerpt {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.blog-featured__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* ── Card refinements ───────────────────────────────────────── */
.blog-card { border-radius: var(--radius-xl); }
.blog-card:hover { box-shadow: var(--shadow-lg); }
.blog-card__title { font-size: var(--font-size-xl); letter-spacing: var(--tracking-tight); }

/* Section heading for the grid */
.blog-section-heading {
  max-width: 1200px;
  margin: var(--space-12) auto var(--space-2);
  padding: 0 var(--space-6);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-tight);
}

/* ── Article body: premium reading typography ───────────────── */
.blog-article { max-width: 70ch; }
.blog-article__body { font-size: 1.125rem; line-height: 1.8; }
/* Lead paragraph — first paragraph reads larger for editorial feel */
.blog-article__body > .blog-p:first-of-type {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}
.blog-quote blockquote { font-size: var(--font-size-2xl); }
.blog-pre { background: var(--color-nav-bg); }
.blog-pre code { color: #e6edf3; }
.blog-code-header { background: color-mix(in srgb, var(--color-nav-bg) 92%, #fff); }
.blog-code-lang { color: rgb(255 255 255 / 0.6); }

/* ── Previous / Next article navigation ─────────────────────── */
.blog-post-nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.blog-post-nav__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  text-decoration: none;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast),
              transform var(--duration-fast);
}
.blog-post-nav__link:hover {
  border-color: var(--color-primary-border);
  box-shadow: var(--shadow-sm);
  transform: translateY(var(--motion-lift));
}
.blog-post-nav__link--next { text-align: right; align-items: flex-end; }
.blog-post-nav__dir {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-text-tertiary);
}
.blog-post-nav__title {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  line-height: var(--line-height-snug);
}
.blog-post-nav__link:hover .blog-post-nav__title { color: var(--color-primary); }

/* ── Newsletter / contribute CTA banner ─────────────────────── */
.blog-newsletter {
  max-width: 1200px;
  margin: var(--space-12) auto 0;
  padding: 0 var(--space-6);
}
.blog-newsletter__inner {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-2xl);
  background: var(--gradient-hero);
  padding: var(--space-12);
  text-align: center;
}
.blog-newsletter__inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-aurora-dark);
  opacity: 0.8;
  pointer-events: none;
}
.blog-newsletter__content { position: relative; z-index: 1; max-width: 560px; margin: 0 auto; }
.blog-newsletter__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-inverse);
  margin: 0 0 var(--space-3);
  letter-spacing: var(--tracking-tight);
}
.blog-newsletter__text {
  font-size: var(--font-size-body);
  color: rgb(255 255 255 / 0.8);
  line-height: var(--line-height-relaxed);
  margin: 0 0 var(--space-6);
}
.blog-newsletter__btn {
  display: inline-block;
  padding: var(--space-3) var(--space-8);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: transform var(--duration-fast), box-shadow var(--duration-fast);
}
.blog-newsletter__btn:hover {
  transform: translateY(var(--motion-lift));
  box-shadow: var(--shadow-lg);
}

/* ── 404 / not-found ────────────────────────────────────────── */
.blog-not-found {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: var(--space-16) var(--space-6);
}
.blog-not-found__inner {
  text-align: center;
  max-width: 480px;
}
.blog-not-found__code {
  font-size: clamp(4rem, 14vw, 7rem);
  font-weight: var(--font-weight-extrabold);
  line-height: 1;
  margin: 0 0 var(--space-4);
  letter-spacing: var(--tracking-tight);
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.blog-not-found__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-3);
}
.blog-not-found__message {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0 0 var(--space-6);
}
.blog-not-found__link {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: background-color var(--duration-fast), transform var(--duration-fast);
}
.blog-not-found__link:hover {
  background: var(--color-primary-hover);
  transform: translateY(var(--motion-lift));
}

/* ── Premium layer — responsive ─────────────────────────────── */
@media (max-width: 767px) {
  .blog-featured__card { grid-template-columns: 1fr; }
  .blog-featured__media { min-height: 200px; }
  .blog-featured__body { padding: var(--space-6); }
  .blog-featured__title { font-size: var(--font-size-2xl); }
  .blog-post-nav { grid-template-columns: 1fr; }
  .blog-newsletter__inner { padding: var(--space-8); }
  .blog-article__body { font-size: 1.0625rem; line-height: 1.75; }
  .blog-article__body > .blog-p:first-of-type { font-size: 1.125rem; }
}

@media (prefers-reduced-motion: reduce) {
  .blog-featured__card:hover,
  .blog-card:hover,
  .blog-post-nav__link:hover,
  .blog-newsletter__btn:hover { transform: none; }
  .blog-featured__card:hover .blog-featured__img { transform: none; }
}