/* blog.css - Clean, Editorial Design System for QuickBillFree Guides */

:root {
  --blog-bg: #f8fafc;
  --blog-surface: #ffffff;
  --blog-border: #e2e8f0;
  --blog-border-subtle: #f1f5f9;
  --blog-primary: #4f46e5;
  --blog-primary-hover: #4338ca;
  --blog-primary-light: #eef2ff;
  --blog-emerald: #059669;
  --blog-emerald-light: #ecfdf5;
  --blog-amber: #d97706;
  --blog-amber-light: #fffbeb;
  --blog-slate: #0f172a;
  --blog-slate-muted: #475569;
  --blog-slate-dim: #94a3b8;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

/* Base Blog Layout */
body.blog-page {
  background-color: var(--blog-bg);
  color: var(--blog-slate);
  font-family: var(--font-family);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Blog Navigation */
.blog-nav {
  background: var(--blog-surface);
  border-bottom: 1px solid var(--blog-border);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: 12px 0;
}

.blog-nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.blog-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--blog-slate);
}

.blog-badge-tag {
  background: var(--blog-primary-light);
  color: var(--blog-primary);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 8px;
  border-radius: 9999px;
  border: 1px solid #c7d2fe;
}

.blog-nav-links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-nav-primary {
  background: var(--blog-primary);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-nav-primary:hover {
  background: var(--blog-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.btn-nav-ghost {
  color: var(--blog-slate-muted);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: all 0.15s ease;
}

.btn-nav-ghost:hover {
  color: var(--blog-slate);
  background: var(--blog-border-subtle);
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--blog-slate-dim);
  padding: 20px 0 10px 0;
  list-style: none;
}

.breadcrumbs a {
  color: var(--blog-slate-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.breadcrumbs a:hover {
  color: var(--blog-primary);
  text-decoration: underline;
}

.breadcrumbs-sep {
  color: var(--blog-border);
}

/* Hero Section (Blog Hub) */
.blog-hero {
  background: linear-gradient(180deg, #ffffff 0%, var(--blog-bg) 100%);
  border-bottom: 1px solid var(--blog-border);
  padding: 48px 0 36px 0;
  text-align: center;
}

.blog-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--blog-primary-light);
  color: var(--blog-primary);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 9999px;
  margin-bottom: 16px;
  border: 1px solid #c7d2fe;
}

.blog-hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--blog-slate);
  margin-bottom: 12px;
  line-height: 1.2;
}

.blog-hero-desc {
  font-size: 1.125rem;
  color: var(--blog-slate-muted);
  max-width: 640px;
  margin: 0 auto 24px auto;
}

/* Category Filters */
.category-filter-bar {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.category-pill {
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--blog-slate-muted);
  background: var(--blog-surface);
  border: 1px solid var(--blog-border);
  text-decoration: none;
  transition: all 0.15s ease;
  cursor: pointer;
}

.category-pill:hover, .category-pill.active {
  background: var(--blog-primary);
  color: #ffffff;
  border-color: var(--blog-primary);
}

/* Featured Article Card */
.featured-card-wrapper {
  margin: 36px 0;
}

.featured-article-card {
  background: var(--blog-surface);
  border: 1px solid var(--blog-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 32px;
  align-items: center;
  transition: all 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.featured-article-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: #c7d2fe;
}

.featured-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.8125rem;
  color: var(--blog-slate-muted);
}

.featured-pill {
  background: #fef3c7;
  color: #b45309;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
}

.featured-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--blog-slate);
  line-height: 1.3;
  margin-bottom: 12px;
}

.featured-excerpt {
  color: var(--blog-slate-muted);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.read-more-link {
  color: var(--blog-primary);
  font-weight: 700;
  font-size: 0.9375rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.featured-visual {
  background: linear-gradient(135deg, #e0e7ff 0%, #ede9fe 100%);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px dashed #c7d2fe;
  min-height: 220px;
}

.featured-visual-icon {
  font-size: 3.5rem;
  margin-bottom: 8px;
}

.featured-visual-label {
  font-weight: 700;
  color: var(--blog-primary);
  font-size: 0.875rem;
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin: 32px 0 60px 0;
}

.article-card {
  background: var(--blog-surface);
  border: 1px solid var(--blog-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.article-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: 4px;
  background: #f1f5f9;
  color: #475569;
}

.article-tag.tag-guides { background: #e0e7ff; color: #3730a3; }
.article-tag.tag-payments { background: #ecfdf5; color: #065f46; }
.article-tag.tag-privacy { background: #fef2f2; color: #991b1b; }
.article-tag.tag-accounting { background: #fef3c7; color: #92400e; }

.article-read-time {
  font-size: 0.8125rem;
  color: var(--blog-slate-dim);
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blog-slate);
  line-height: 1.4;
  margin-bottom: 10px;
}

.article-card-title:hover {
  color: var(--blog-primary);
}

.article-card-excerpt {
  font-size: 0.9375rem;
  color: var(--blog-slate-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--blog-border-subtle);
  padding-top: 14px;
  font-size: 0.8125rem;
  color: var(--blog-slate-dim);
}

/* In-Article Single Post Layout */
.article-container {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px;
}

.article-header {
  margin: 24px 0 32px 0;
  text-align: left;
}

.article-category-badge {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--blog-primary);
  margin-bottom: 12px;
}

.article-main-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--blog-slate);
  margin-bottom: 16px;
}

.article-byline {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.875rem;
  color: var(--blog-slate-muted);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--blog-border);
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #e0e7ff;
  color: var(--blog-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  border: 1px solid #c7d2fe;
}

/* Article Prose Content */
.prose {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: #334155;
}

.prose p {
  margin-bottom: 20px;
}

.prose h2 {
  font-size: 1.625rem;
  font-weight: 800;
  color: var(--blog-slate);
  letter-spacing: -0.015em;
  margin-top: 40px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--blog-border-subtle);
}

.prose h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--blog-slate);
  margin-top: 28px;
  margin-bottom: 12px;
}

.prose ul, .prose ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.prose li {
  margin-bottom: 8px;
}

.prose strong {
  color: var(--blog-slate);
  font-weight: 700;
}

.prose a {
  color: var(--blog-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose a:hover {
  color: var(--blog-primary-hover);
}

/* Callout Boxes */
.callout {
  padding: 20px 24px;
  border-radius: var(--radius-md);
  margin: 28px 0;
  border-left: 4px solid var(--blog-primary);
  background: var(--blog-primary-light);
}

.callout-title {
  font-weight: 700;
  font-size: 1rem;
  color: var(--blog-primary);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.callout-body {
  font-size: 0.9375rem;
  color: #3730a3;
  margin: 0;
}

.callout.callout-success {
  border-left-color: var(--blog-emerald);
  background: var(--blog-emerald-light);
}

.callout.callout-success .callout-title {
  color: var(--blog-emerald);
}

.callout.callout-success .callout-body {
  color: #065f46;
}

/* Comparison Tables */
.table-wrapper {
  overflow-x: auto;
  margin: 28px 0;
  border: 1px solid var(--blog-border);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.prose-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
}

.prose-table th {
  background: #f8fafc;
  padding: 12px 16px;
  font-weight: 700;
  color: var(--blog-slate);
  border-bottom: 2px solid var(--blog-border);
}

.prose-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--blog-border-subtle);
  color: #334155;
}

.prose-table tr:last-child td {
  border-bottom: none;
}

/* Call to Action Banner */
.blog-cta-banner {
  background: linear-gradient(135deg, #4f46e5 0%, #3730a3 100%);
  color: #ffffff;
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  margin: 48px 0;
  box-shadow: var(--shadow-md);
}

.blog-cta-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: #ffffff;
}

.blog-cta-desc {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 580px;
  margin: 0 auto 24px auto;
  line-height: 1.6;
}

.btn-cta-white {
  background: #ffffff;
  color: #4f46e5;
  font-weight: 700;
  font-size: 1rem;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s ease;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.btn-cta-white:hover {
  background: #f8fafc;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

/* Author Box */
.author-box {
  background: #ffffff;
  border: 1px solid var(--blog-border);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 40px 0;
  display: flex;
  align-items: center;
  gap: 20px;
}

.author-box-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #e0e7ff;
  color: var(--blog-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  flex-shrink: 0;
}

.author-box-name {
  font-weight: 700;
  font-size: 1rem;
  color: var(--blog-slate);
  margin-bottom: 4px;
}

.author-box-bio {
  font-size: 0.875rem;
  color: var(--blog-slate-muted);
  line-height: 1.5;
  margin: 0;
}

/* Related Posts */
.related-posts-section {
  border-top: 1px solid var(--blog-border);
  padding-top: 40px;
  margin-top: 40px;
}

.related-posts-title {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--blog-slate);
  margin-bottom: 20px;
}

/* Blog Footer */
.blog-footer {
  background: #ffffff;
  border-top: 1px solid var(--blog-border);
  padding: 40px 0 24px 0;
  margin-top: auto;
  text-align: center;
}

.blog-footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 16px;
}

.blog-footer-links a {
  color: var(--blog-slate-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
}

.blog-footer-links a:hover {
  color: var(--blog-primary);
}

.blog-copyright {
  font-size: 0.8125rem;
  color: var(--blog-slate-dim);
}

/* Mobile Adjustments */
@media screen and (max-width: 768px) {
  .featured-article-card {
    grid-template-columns: 1fr;
    padding: 24px;
  }
  .blog-hero-title {
    font-size: 1.875rem;
  }
  .article-main-title {
    font-size: 1.75rem;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .blog-nav-container {
    flex-wrap: wrap;
  }
}