/* ============================================================================
   Newsletter Archive Styles — Machine Learning Systems
   Matches the landing site design language (Inter font, Harvard crimson accent).
   ============================================================================ */

:root {
  --nl-accent: #A51C30;
  --nl-accent-hover: #8a1728;
  --nl-text: #1a1a2e;
  --nl-text-muted: #6b7280;
  --nl-bg: #ffffff;
  --nl-card-bg: #f9fafb;
  --nl-border: #e5e7eb;
}

/* Dark mode overrides */
.quarto-dark {
  --nl-text: #e5e7eb;
  --nl-text-muted: #9ca3af;
  --nl-bg: #0f1117;
  --nl-card-bg: #1a1d2e;
  --nl-border: #374151;
}

/* ── Hide default Quarto title block on INDEX page only (we use custom hero) ── */
.page-layout-full #title-block-header,
.page-layout-full .quarto-title-block,
.page-layout-full header.quarto-title-block {
  display: none !important;
}

/* ── Style title block on individual post pages ── */
.quarto-title-block .quarto-title h1.title {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  color: var(--nl-text);
  line-height: 1.2;
  border: none !important;
  padding-left: 0 !important;
}

.quarto-title-block .quarto-title-meta {
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  color: var(--nl-text-muted);
  margin-top: 1rem;
}

.quarto-title-block .quarto-title-meta .quarto-title-meta-heading {
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--nl-text-muted);
}

.quarto-title-block .quarto-title-meta .quarto-title-meta-contents {
  color: var(--nl-text);
}

.quarto-title-block .quarto-category {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  background: rgba(165, 28, 48, 0.1);
  color: var(--nl-accent);
}

/* ── Post body content ── */
.content {
  font-family: 'Inter', sans-serif;
}

/* Constrain images in newsletter posts */
.content figure,
.content img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 1.5rem auto;
  display: block;
}

.content figure {
  text-align: center;
}

.content figcaption {
  font-size: 0.8rem;
  color: var(--nl-text-muted);
  font-style: italic;
  margin-top: 0.5rem;
  text-align: center;
}

/* Back link to newsletter index */
.quarto-title-block + .content a[href*="index"],
nav.breadcrumb {
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  color: var(--nl-accent);
}

/* ── Hero Section ── */
.newsletter-hero {
  padding: 4.5rem 2rem 3rem;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.newsletter-hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.newsletter-eyebrow {
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--nl-accent);
  margin-bottom: 0.75rem;
}

.newsletter-title {
  font-family: 'Inter', sans-serif;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--nl-text);
  margin-bottom: 1rem;
}

.newsletter-tagline {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--nl-text-muted);
  margin-bottom: 1.5rem;
}

/* ── Embedded Subscribe Form ── */
/* ── Social Proof Stats ── */
.newsletter-stats {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--nl-text-muted);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

/* ── Subscribe Button (triggers shared modal) ── */
.newsletter-subscribe-form {
  margin-bottom: 1.5rem;
}

.newsletter-subscribe-btn-hero {
  padding: 0.85rem 2.5rem;
  background: var(--nl-accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}

.newsletter-subscribe-btn-hero:hover {
  background: var(--nl-accent-hover);
  transform: translateY(-1px);
}

.newsletter-form-note {
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  color: var(--nl-text-muted);
  margin-top: 0.4rem;
  opacity: 0.7;
}

/* ── CTA Buttons ── */
.newsletter-cta {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 0;
}

.newsletter-rss-btn {
  display: inline-block;
  padding: 0.45rem 1rem;
  background: transparent;
  color: var(--nl-text-muted) !important;
  text-decoration: none;
  border: 1.5px solid var(--nl-border);
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  font-weight: 500;
  font-size: 0.8rem;
  transition: border-color 0.2s, color 0.2s;
}

.newsletter-rss-btn:hover {
  border-color: var(--nl-accent);
  color: var(--nl-accent) !important;
  text-decoration: none;
}

.newsletter-rss-btn i {
  margin-right: 0.3rem;
}

/* ── Listing Section Header ── */
.newsletter-listing-header {
  max-width: 720px;
  margin: 0 auto 1.5rem;
  padding: 2.5rem 2rem 0;
}

.newsletter-listing-header h2 {
  font-family: 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--nl-text);
  margin-bottom: 0.4rem;
  border: none !important;
  padding-left: 0 !important;
}

.newsletter-listing-header p {
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  color: var(--nl-text-muted);
  margin: 0;
}

/* ── Listing Container ── */
#listing-newsletter-listing {
  max-width: 720px;
  margin: 0 auto 2rem;
  padding: 0 2rem;
}

/* ── Listing Cards ── */
#listing-newsletter-listing .quarto-post {
  border: 1px solid var(--nl-border);
  border-radius: 10px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  background: var(--nl-card-bg);
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
}

#listing-newsletter-listing .quarto-post:hover {
  border-color: var(--nl-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

/* ── Grid card styling ── */
#listing-newsletter-listing .quarto-grid-item {
  border: 1px solid var(--nl-border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--nl-card-bg);
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
}

#listing-newsletter-listing .quarto-grid-item:hover {
  border-color: var(--nl-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

/* Banner image — full width across the card */
#listing-newsletter-listing .quarto-grid-item .card-img-top {
  width: 100%;
  object-fit: cover;
  border-radius: 0;
}

/* Hide empty image placeholders */
#listing-newsletter-listing .quarto-grid-item .listing-item-img-placeholder {
  display: none;
}

/* Card body */
#listing-newsletter-listing .quarto-grid-item .card-body {
  padding: 1.25rem;
}

#listing-newsletter-listing .quarto-grid-item .card-title {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  border: none !important;
  padding-left: 0 !important;
}

#listing-newsletter-listing .quarto-grid-item .card-title a {
  color: var(--nl-text);
  text-decoration: none;
}

#listing-newsletter-listing .quarto-grid-item .card-title a:hover {
  color: var(--nl-accent);
}

#listing-newsletter-listing .quarto-grid-item .card-text {
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  color: var(--nl-text-muted);
  line-height: 1.5;
}

/* Date — crimson accent, uppercase, small caps feel */
#listing-newsletter-listing .quarto-grid-item .listing-date,
#listing-newsletter-listing .quarto-grid-item .card-attribution .listing-date {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--nl-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Title */
#listing-newsletter-listing .listing-title {
  font-family: 'Inter', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--nl-text);
  line-height: 1.3;
  margin-bottom: 0.25rem;
}

#listing-newsletter-listing .listing-title a {
  color: var(--nl-text);
  text-decoration: none;
}

#listing-newsletter-listing .listing-title a:hover {
  color: var(--nl-accent);
}

/* Author */
#listing-newsletter-listing .listing-author {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--nl-accent);
  opacity: 0.85;
}

/* Date */
#listing-newsletter-listing .listing-date {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  color: var(--nl-text-muted);
}

/* Description */
#listing-newsletter-listing .listing-description {
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  color: var(--nl-text-muted);
  line-height: 1.5;
}

/* Category tags */
#listing-newsletter-listing .listing-category {
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: var(--nl-border);
  color: var(--nl-text-muted);
}

/* ── Categories Sidebar ── */
.quarto-listing-category {
  font-family: 'Inter', sans-serif;
}

.quarto-listing-category .category {
  font-size: 0.85rem;
  padding: 0.3rem 0;
  color: var(--nl-text-muted);
  transition: color 0.15s;
}

.quarto-listing-category .category:hover {
  color: var(--nl-accent);
}

/* ── Bottom CTA ── */
.newsletter-bottom-cta {
  text-align: center;
  max-width: 720px;
  margin: 2rem auto 4rem;
  padding: 2rem;
  background: var(--nl-card-bg);
  border-radius: 10px;
  border: 1px solid var(--nl-border);
}

.newsletter-bottom-text {
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  color: var(--nl-text);
  margin-bottom: 1rem;
}

.newsletter-bottom-btn {
  display: inline-block;
  padding: 0.65rem 1.75rem;
  background: var(--nl-accent);
  color: #fff !important;
  text-decoration: none !important;
  border-radius: 6px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.newsletter-bottom-btn:hover {
  background: var(--nl-accent-hover);
}

/* ── Empty State ── */
#listing-newsletter-listing .listing-no-matching {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--nl-text-muted);
  font-family: 'Inter', sans-serif;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .newsletter-hero {
    padding: 2.5rem 1.5rem 1.5rem;
  }

  .newsletter-cta {
    flex-direction: column;
    align-items: center;
  }

  .newsletter-form-inline {
    flex-direction: column;
    border-radius: 8px;
  }

  .newsletter-email-input {
    border-radius: 6px 6px 0 0;
  }

  .newsletter-submit-btn {
    border-radius: 0 0 6px 6px;
  }

  .newsletter-rss-btn {
    padding: 0.65rem 1.25rem;
    font-size: 0.85rem;
  }

  #listing-newsletter-listing {
    padding: 0 1rem;
  }

  #listing-newsletter-listing .quarto-post {
    padding: 1rem;
  }
}

/* Hide thumbnails on narrow screens — text-only cards like Substack mobile */
@media (max-width: 576px) {
  #listing-newsletter-listing .quarto-post .thumbnail {
    display: none;
  }
}