/* =========================================================================
   ZeroGPTFree Blog Styles
   -------------------------------------------------------------------------
   ALL classes are prefixed with .zgf- to prevent any conflict with the
   existing tools section styles.
   This file is only loaded on /blog/* pages.
   Place at: /blog/css/blog.css
   ========================================================================= */

/* CSS variables scoped to blog only — no leakage into tools section */
.zgf-blog-wrap,
.zgf-blog-wrap * {
  --zgf-ink: #111827;
  --zgf-ink-soft: #374151;
  --zgf-muted: #6b7280;
  --zgf-muted-light: #9ca3af;
  --zgf-line: #e5e7eb;
  --zgf-line-soft: #f3f4f6;
  --zgf-bg: #ffffff;
  --zgf-bg-soft: #f9fafb;
  --zgf-bg-card: #ffffff;
  --zgf-accent: #2563eb;
  --zgf-accent-dark: #1d4ed8;
  --zgf-accent-soft: #dbeafe;
  --zgf-good: #059669;
  --zgf-good-soft: #d1fae5;
  --zgf-radius: 10px;
  --zgf-radius-lg: 16px;
  --zgf-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --zgf-shadow: 0 4px 12px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --zgf-shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10), 0 2px 6px rgba(15, 23, 42, 0.05);
  --zgf-font: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", system-ui, sans-serif;
  --zgf-font-serif: "Source Serif Pro", "Charter", Georgia, serif;
}

/* =========================================================================
   LAYOUT WRAPPER
   ========================================================================= */
.zgf-blog-wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 24px 96px;
  font-family: var(--zgf-font);
  color: var(--zgf-ink-soft);
  line-height: 1.7;
  font-size: 17px;
}

@media (max-width: 720px) {
  .zgf-blog-wrap {
    padding: 32px 18px 64px;
    font-size: 16px;
  }
}

/* =========================================================================
   BLOG INDEX: HERO
   ========================================================================= */
.zgf-blog-hero {
  text-align: center;
  margin: 0 auto 56px;
  max-width: 720px;
}
.zgf-blog-hero-eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--zgf-accent);
  background: var(--zgf-accent-soft);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.zgf-blog-hero-title {
  font-size: 2.6rem;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--zgf-ink);
  margin: 0 0 16px;
  font-weight: 700;
}
.zgf-blog-hero-sub {
  font-size: 1.15rem;
  color: var(--zgf-muted);
  margin: 0;
  line-height: 1.55;
}
@media (max-width: 720px) {
  .zgf-blog-hero { margin-bottom: 36px; }
  .zgf-blog-hero-title { font-size: 1.85rem; }
  .zgf-blog-hero-sub { font-size: 1rem; }
}

/* =========================================================================
   BLOG INDEX: FEATURED CARD
   ========================================================================= */
.zgf-featured-card {
  display: block;
  text-decoration: none;
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  color: #ffffff;
  border-radius: var(--zgf-radius-lg);
  padding: 48px;
  margin-bottom: 64px;
  box-shadow: var(--zgf-shadow-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}
.zgf-featured-card::before {
  content: "";
  position: absolute;
  top: 0; right: 0;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.25) 0%, transparent 70%);
  pointer-events: none;
}
.zgf-featured-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 50px rgba(15, 23, 42, 0.18);
}
.zgf-featured-content { position: relative; z-index: 1; }
.zgf-featured-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 18px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
}
.zgf-featured-tag {
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  padding: 5px 12px;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.zgf-featured-title {
  font-size: 2.1rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: #ffffff;
  margin: 0 0 16px;
  font-weight: 700;
  max-width: 720px;
}
.zgf-featured-excerpt {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.82);
  margin: 0 0 24px;
  max-width: 680px;
  line-height: 1.55;
}
.zgf-featured-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: #93c5fd;
  font-weight: 600;
}
.zgf-featured-cta .zgf-arrow {
  display: inline-block;
  transition: transform 0.2s ease;
}
.zgf-featured-card:hover .zgf-arrow { transform: translateX(4px); }
.zgf-featured-time {
  margin-left: auto;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.85rem;
  font-weight: 500;
}
@media (max-width: 720px) {
  .zgf-featured-card { padding: 28px 24px; margin-bottom: 40px; }
  .zgf-featured-title { font-size: 1.4rem; }
  .zgf-featured-excerpt { font-size: 1rem; }
  .zgf-featured-cta { flex-wrap: wrap; }
  .zgf-featured-time { margin-left: 0; width: 100%; }
}

/* =========================================================================
   BLOG INDEX: SECTION DIVIDER
   ========================================================================= */
.zgf-section-divider {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 0 0 32px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--zgf-line);
}
.zgf-section-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--zgf-ink);
  margin: 0;
  letter-spacing: -0.01em;
}
.zgf-section-count {
  font-size: 0.9rem;
  color: var(--zgf-muted);
  font-weight: 500;
}

/* =========================================================================
   BLOG INDEX: POST GRID
   ========================================================================= */
.zgf-post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 24px;
}
.zgf-post-card {
  display: flex;
  flex-direction: column;
  background: var(--zgf-bg-card);
  border: 1px solid var(--zgf-line);
  border-radius: var(--zgf-radius);
  padding: 28px 24px;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  box-shadow: var(--zgf-shadow-sm);
}
.zgf-post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--zgf-shadow-lg);
  border-color: transparent;
}
.zgf-post-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  font-size: 0.8rem;
}
.zgf-post-card-cat {
  background: var(--zgf-accent-soft);
  color: var(--zgf-accent-dark);
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.zgf-post-card-time {
  color: var(--zgf-muted-light);
  font-weight: 500;
}
.zgf-post-card-title {
  font-size: 1.18rem;
  line-height: 1.35;
  color: var(--zgf-ink);
  margin: 0 0 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.zgf-post-card-excerpt {
  font-size: 0.95rem;
  color: var(--zgf-muted);
  margin: 0 0 24px;
  line-height: 1.55;
  flex: 1;
}
.zgf-post-card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--zgf-muted-light);
  padding-top: 16px;
  border-top: 1px solid var(--zgf-line-soft);
}
.zgf-post-card-read {
  color: var(--zgf-accent);
  font-weight: 600;
}
.zgf-post-card:hover .zgf-post-card-read { color: var(--zgf-accent-dark); }

/* =========================================================================
   SINGLE POST PAGE
   ========================================================================= */
.zgf-post {
  max-width: 740px;
  margin: 0 auto;
}
.zgf-post-header {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--zgf-line);
}
.zgf-post-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}
.zgf-back-link {
  color: var(--zgf-accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s ease;
}
.zgf-back-link:hover {
  color: var(--zgf-accent-dark);
  text-decoration: underline;
}
.zgf-post-category {
  background: var(--zgf-accent-soft);
  color: var(--zgf-accent-dark);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.zgf-post-title {
  font-size: 2.6rem;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--zgf-ink);
  margin: 0 0 20px;
  font-weight: 700;
}
.zgf-post-byline {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.92rem;
  color: var(--zgf-muted);
}
.zgf-post-byline strong { color: var(--zgf-ink); font-weight: 600; }
.zgf-dot { color: var(--zgf-muted-light); }
@media (max-width: 720px) {
  .zgf-post-title { font-size: 1.7rem; }
  .zgf-post-header { margin-bottom: 28px; padding-bottom: 22px; }
}

/* =========================================================================
   SINGLE POST: BODY (the actual article content)
   ========================================================================= */
.zgf-post-body {
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--zgf-ink-soft);
}
.zgf-post-body > h1 { display: none; } /* h1 is in the header, hide if duplicated in markdown */
.zgf-post-body h2 {
  font-size: 1.7rem;
  line-height: 1.25;
  color: var(--zgf-ink);
  margin: 3rem 0 1.2rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  scroll-margin-top: 80px;
}
.zgf-post-body h3 {
  font-size: 1.28rem;
  line-height: 1.3;
  color: var(--zgf-ink);
  margin: 2.2rem 0 .8rem;
  font-weight: 700;
}
.zgf-post-body h4 {
  font-size: 1.08rem;
  color: var(--zgf-ink);
  margin: 1.8rem 0 .6rem;
  font-weight: 600;
}
.zgf-post-body p { margin: 0 0 1.3rem; }
.zgf-post-body strong { color: var(--zgf-ink); font-weight: 600; }
.zgf-post-body em { font-style: italic; }
.zgf-post-body a {
  color: var(--zgf-accent);
  text-decoration: underline;
  text-decoration-color: var(--zgf-accent-soft);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease;
}
.zgf-post-body a:hover { text-decoration-color: var(--zgf-accent); }
.zgf-post-body ul,
.zgf-post-body ol {
  margin: 0 0 1.5rem;
  padding-left: 1.4rem;
}
.zgf-post-body li {
  margin: 0.5rem 0;
  padding-left: 0.4rem;
}
.zgf-post-body li::marker { color: var(--zgf-accent); }
.zgf-post-body blockquote {
  margin: 1.8rem 0;
  padding: 1.2rem 1.5rem;
  border-left: 4px solid var(--zgf-accent);
  background: var(--zgf-bg-soft);
  color: var(--zgf-ink-soft);
  font-style: italic;
  border-radius: 0 var(--zgf-radius) var(--zgf-radius) 0;
}
.zgf-post-body blockquote p:last-child { margin-bottom: 0; }
.zgf-post-body hr {
  border: none;
  border-top: 1px solid var(--zgf-line);
  margin: 2.5rem 0;
}
.zgf-post-body code {
  background: var(--zgf-line-soft);
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: "SF Mono", Menlo, Monaco, "Courier New", monospace;
  color: var(--zgf-ink);
}
.zgf-post-body pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1.2rem 1.4rem;
  border-radius: var(--zgf-radius);
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.92rem;
  line-height: 1.6;
}
.zgf-post-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

/* Tables in post body */
.zgf-post-body table,
.zgf-post-body .table-wrap table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 2rem;
  font-size: 0.94rem;
  background: var(--zgf-bg-card);
  border-radius: var(--zgf-radius);
  overflow: hidden;
  box-shadow: var(--zgf-shadow-sm);
  border: 1px solid var(--zgf-line);
}
.zgf-post-body th {
  background: var(--zgf-ink);
  color: #ffffff;
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
}
.zgf-post-body td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--zgf-line-soft);
  vertical-align: top;
  color: var(--zgf-ink-soft);
}
.zgf-post-body tbody tr:nth-child(even) td { background: var(--zgf-bg-soft); }
.zgf-post-body tbody tr:last-child td { border-bottom: none; }
.zgf-post-body .table-wrap {
  overflow-x: auto;
  margin: 1.5rem 0 2rem;
  -webkit-overflow-scrolling: touch;
}

/* Responsive type adjustments */
@media (max-width: 720px) {
  .zgf-post-body { font-size: 1rem; }
  .zgf-post-body h2 { font-size: 1.35rem; margin-top: 2.2rem; }
  .zgf-post-body h3 { font-size: 1.13rem; }
  .zgf-post-body table { font-size: 0.85rem; }
  .zgf-post-body th,
  .zgf-post-body td { padding: 9px 11px; }
}

/* =========================================================================
   SINGLE POST: FOOTER
   ========================================================================= */
.zgf-post-footer {
  margin: 56px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--zgf-line);
  text-align: center;
}
.zgf-post-updated {
  font-size: 0.88rem;
  color: var(--zgf-muted);
  margin: 0;
}

/* =========================================================================
   RELATED POSTS (single post page)
   ========================================================================= */
.zgf-related {
  max-width: 1180px;
  margin: 80px auto 0;
  padding-top: 56px;
  border-top: 1px solid var(--zgf-line);
}
.zgf-related-heading {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--zgf-ink);
  margin: 0 0 32px;
  text-align: center;
  letter-spacing: -0.015em;
}
.zgf-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 22px;
}
.zgf-related-card {
  display: block;
  text-decoration: none;
  background: var(--zgf-bg-card);
  border: 1px solid var(--zgf-line);
  border-radius: var(--zgf-radius);
  padding: 24px 22px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.zgf-related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--zgf-shadow);
  border-color: transparent;
}
.zgf-related-category {
  display: inline-block;
  background: var(--zgf-accent-soft);
  color: var(--zgf-accent-dark);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}
.zgf-related-title {
  font-size: 1.06rem;
  line-height: 1.35;
  color: var(--zgf-ink);
  margin: 0 0 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.zgf-related-excerpt {
  font-size: 0.9rem;
  color: var(--zgf-muted);
  margin: 0 0 16px;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.zgf-related-read {
  font-size: 0.85rem;
  color: var(--zgf-accent);
  font-weight: 600;
}
@media (max-width: 720px) {
  .zgf-related { margin-top: 48px; padding-top: 36px; }
  .zgf-related-heading { font-size: 1.3rem; margin-bottom: 24px; }
}