/* ═══════════════════════════════════════════════════════════
   ProdXVerse Blog — Public Stylesheet
   Design Language: Matches the course landing page
   ═══════════════════════════════════════════════════════════ */

:root {
  --pxv-indigo: #4338CA;
  --pxv-indigo-light: #6366F1;
  --pxv-coral: #EA580C;
  --pxv-coral-light: #F97316;
  --pxv-sand: #F8F7F3;
  --pxv-sand-dark: #EEEADE;
  --pxv-dark: #1A1A2E;
  --pxv-dark-soft: #2D2B55;
  --pxv-text: #333340;
  --pxv-text-light: #6B7280;
  --pxv-text-lighter: #9CA3AF;
  --pxv-white: #FFFFFF;
  --pxv-border: #E5E7EB;
  --pxv-success: #059669;
  --pxv-radius: 12px;
  --pxv-radius-lg: 20px;
  --pxv-shadow: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(0,0,0,.04);
  --pxv-shadow-lg: 0 8px 30px rgba(0,0,0,.08);
  --pxv-shadow-xl: 0 20px 60px rgba(0,0,0,.1);
  --pxv-font-heading: 'Bricolage Grotesque', system-ui, sans-serif;
  --pxv-font-body: 'Geist', system-ui, sans-serif;
  --pxv-font-mono: 'Geist Mono', monospace;
  --pxv-container: 1200px;
  --pxv-transition: .3s cubic-bezier(.4,0,.2,1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--pxv-font-body);
  color: var(--pxv-text);
  background: var(--pxv-sand);
  line-height: 1.7;
  font-size: 16px;
}

a { color: var(--pxv-indigo); text-decoration: none; transition: color var(--pxv-transition); }
a:hover { color: var(--pxv-coral); }

img { max-width: 100%; height: auto; display: block; }

.container {
  max-width: var(--pxv-container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Blog Navbar ──────────────────────────────────────────── */
.blog-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248,247,243,.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--pxv-border);
  padding: 0 24px;
  transition: box-shadow var(--pxv-transition);
}

.blog-nav.scrolled { box-shadow: var(--pxv-shadow); }

.blog-nav__inner {
  max-width: var(--pxv-container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.blog-nav__logo {
  font-family: var(--pxv-font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--pxv-dark);
}
.blog-nav__logo span { color: var(--pxv-indigo); }

.blog-nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.blog-nav__links a {
  color: var(--pxv-text);
  font-size: .9rem;
  font-weight: 500;
  position: relative;
}
.blog-nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--pxv-indigo);
  transition: width var(--pxv-transition);
}
.blog-nav__links a:hover::after,
.blog-nav__links a.active::after { width: 100%; }

.blog-nav__search {
  display: flex;
  align-items: center;
  background: var(--pxv-white);
  border: 1px solid var(--pxv-border);
  border-radius: 999px;
  padding: 6px 14px;
  gap: 8px;
  transition: border-color var(--pxv-transition);
}
.blog-nav__search:focus-within { border-color: var(--pxv-indigo); }
.blog-nav__search input {
  border: none;
  outline: none;
  background: transparent;
  font-family: var(--pxv-font-body);
  font-size: .875rem;
  width: 180px;
  color: var(--pxv-text);
}
.blog-nav__search svg { color: var(--pxv-text-light); flex-shrink: 0; }

.blog-nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  font-size: .875rem;
  font-weight: 600;
  border-radius: 999px;
  background: var(--pxv-indigo);
  color: var(--pxv-white) !important;
  transition: background var(--pxv-transition), transform var(--pxv-transition);
}
.blog-nav__cta:hover { background: var(--pxv-indigo-light); transform: translateY(-1px); }

/* Mobile nav toggle */
.blog-nav__burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
}
.blog-nav__burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--pxv-dark);
  position: absolute;
  left: 0;
  transition: var(--pxv-transition);
}
.blog-nav__burger span:nth-child(1) { top: 0; }
.blog-nav__burger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.blog-nav__burger span:nth-child(3) { bottom: 0; }

/* ─── Blog Hero ────────────────────────────────────────────── */
.blog-hero {
  background: linear-gradient(135deg, var(--pxv-dark) 0%, var(--pxv-dark-soft) 100%);
  color: var(--pxv-white);
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.blog-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(67,56,202,.15) 0%, transparent 60%);
  pointer-events: none;
}
.blog-hero__eyebrow {
  font-family: var(--pxv-font-mono);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--pxv-coral-light);
  margin-bottom: 16px;
}
.blog-hero__title {
  font-family: var(--pxv-font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
}
.blog-hero__desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,.7);
  max-width: 600px;
  margin: 0 auto;
}

/* ─── Category Pills ───────────────────────────────────────── */
.category-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 24px 0;
  margin-bottom: 8px;
}
.category-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--pxv-border);
  background: var(--pxv-white);
  color: var(--pxv-text);
  font-size: .85rem;
  font-weight: 500;
  transition: all var(--pxv-transition);
  cursor: pointer;
}
.category-pill:hover,
.category-pill.active {
  background: var(--pxv-indigo);
  color: var(--pxv-white);
  border-color: var(--pxv-indigo);
}
.category-pill__count {
  font-size: .75rem;
  background: rgba(0,0,0,.08);
  padding: 2px 8px;
  border-radius: 999px;
}
.category-pill.active .category-pill__count {
  background: rgba(255,255,255,.2);
}

/* ─── Blog Grid ────────────────────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  padding-bottom: 60px;
}

/* ─── Post Card ────────────────────────────────────────────── */
.post-card {
  background: var(--pxv-white);
  border-radius: var(--pxv-radius-lg);
  overflow: hidden;
  box-shadow: var(--pxv-shadow);
  transition: transform var(--pxv-transition), box-shadow var(--pxv-transition);
  display: flex;
  flex-direction: column;
}
.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--pxv-shadow-lg);
}

.post-card__image {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--pxv-sand-dark);
}
.post-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
}
.post-card:hover .post-card__image img { transform: scale(1.05); }

.post-card__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
  background: var(--pxv-indigo);
  color: var(--pxv-white);
}
.post-card__badge--featured { background: var(--pxv-coral); }

.post-card__body {
  padding: 20px 22px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.post-card__category {
  font-family: var(--pxv-font-mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--pxv-indigo);
  font-weight: 500;
  margin-bottom: 8px;
}

.post-card__title {
  font-family: var(--pxv-font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--pxv-dark);
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card__title a { color: inherit; }
.post-card__title a:hover { color: var(--pxv-indigo); }

.post-card__excerpt {
  font-size: .9rem;
  color: var(--pxv-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .78rem;
  color: var(--pxv-text-lighter);
  border-top: 1px solid var(--pxv-border);
  padding-top: 14px;
  margin-top: auto;
}
.post-card__author { font-weight: 500; color: var(--pxv-text); }
.post-card__dot { margin: 0 6px; }
.post-card__read-time { display: flex; align-items: center; gap: 4px; }

/* Featured post — full width */
.post-card--featured {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
}
.post-card--featured .post-card__image { aspect-ratio: auto; min-height: 320px; }
.post-card--featured .post-card__body { padding: 32px 36px; justify-content: center; }
.post-card--featured .post-card__title { font-size: 1.6rem; -webkit-line-clamp: 3; }
.post-card--featured .post-card__excerpt { -webkit-line-clamp: 4; font-size: .95rem; }

/* ─── Single Post ──────────────────────────────────────────── */
.post-single { padding: 40px 0 80px; }

.post-single__header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px;
}
.post-single__category {
  font-family: var(--pxv-font-mono);
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--pxv-indigo);
  font-weight: 500;
  margin-bottom: 16px;
  display: inline-block;
}
.post-single__title {
  font-family: var(--pxv-font-heading);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  color: var(--pxv-dark);
  margin-bottom: 20px;
}
.post-single__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: .9rem;
  color: var(--pxv-text-light);
  flex-wrap: wrap;
}
.post-single__meta-item { display: flex; align-items: center; gap: 6px; }

.post-single__featured {
  border-radius: var(--pxv-radius-lg);
  overflow: hidden;
  max-width: 900px;
  margin: 0 auto 48px;
  box-shadow: var(--pxv-shadow-lg);
}
.post-single__featured img { width: 100%; }

/* Post content styling */
.post-content {
  max-width: 740px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--pxv-text);
}
.post-content h2 {
  font-family: var(--pxv-font-heading);
  font-size: 1.7rem;
  font-weight: 700;
  margin: 48px 0 16px;
  color: var(--pxv-dark);
}
.post-content h3 {
  font-family: var(--pxv-font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 36px 0 12px;
  color: var(--pxv-dark);
}
.post-content p { margin-bottom: 20px; }
.post-content ul, .post-content ol {
  margin: 0 0 20px 24px;
}
.post-content li { margin-bottom: 8px; }
.post-content blockquote {
  border-left: 4px solid var(--pxv-indigo);
  padding: 20px 24px;
  margin: 32px 0;
  background: var(--pxv-white);
  border-radius: 0 var(--pxv-radius) var(--pxv-radius) 0;
  font-style: italic;
  color: var(--pxv-text-light);
}
.post-content img {
  border-radius: var(--pxv-radius);
  margin: 32px 0;
  box-shadow: var(--pxv-shadow);
}
.post-content code {
  font-family: var(--pxv-font-mono);
  font-size: .9em;
  background: var(--pxv-sand-dark);
  padding: 2px 8px;
  border-radius: 4px;
}
.post-content pre {
  background: var(--pxv-dark);
  color: #e2e8f0;
  padding: 24px;
  border-radius: var(--pxv-radius);
  overflow-x: auto;
  margin: 32px 0;
}
.post-content pre code {
  background: none;
  padding: 0;
  color: inherit;
}
.post-content a { border-bottom: 1px solid var(--pxv-indigo-light); }
.post-content a:hover { border-bottom-color: var(--pxv-coral); }

/* ─── Post Tags ────────────────────────────────────────────── */
.post-tags {
  max-width: 740px;
  margin: 40px auto;
  padding-top: 24px;
  border-top: 1px solid var(--pxv-border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.post-tag {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  border: 1px solid var(--pxv-border);
  font-size: .8rem;
  color: var(--pxv-text-light);
  transition: all var(--pxv-transition);
}
.post-tag:hover {
  border-color: var(--pxv-indigo);
  color: var(--pxv-indigo);
  background: rgba(67,56,202,.05);
}

/* ─── Author Box ───────────────────────────────────────────── */
.author-box {
  max-width: 740px;
  margin: 48px auto;
  padding: 28px;
  background: var(--pxv-white);
  border-radius: var(--pxv-radius-lg);
  display: flex;
  gap: 20px;
  align-items: center;
  box-shadow: var(--pxv-shadow);
}
.author-box__avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pxv-indigo), var(--pxv-indigo-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pxv-white);
  font-family: var(--pxv-font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.author-box__name {
  font-family: var(--pxv-font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--pxv-dark);
}
.author-box__bio { font-size: .88rem; color: var(--pxv-text-light); margin-top: 4px; }

/* ─── Related Posts ────────────────────────────────────────── */
.related-posts {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 0 0;
}
.related-posts__title {
  font-family: var(--pxv-font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--pxv-dark);
}
.related-posts__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ─── Pagination ───────────────────────────────────────────── */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 40px 0 60px;
}
.pagination__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  font-weight: 500;
  font-size: .9rem;
  border: 1px solid var(--pxv-border);
  background: var(--pxv-white);
  color: var(--pxv-text);
  transition: all var(--pxv-transition);
}
.pagination__link:hover { border-color: var(--pxv-indigo); color: var(--pxv-indigo); }
.pagination__link.active {
  background: var(--pxv-indigo);
  color: var(--pxv-white);
  border-color: var(--pxv-indigo);
}
.pagination__link--arrow { font-size: 1.1rem; }

/* ─── Blog Footer ──────────────────────────────────────────── */
.blog-footer {
  background: var(--pxv-dark);
  color: rgba(255,255,255,.7);
  padding: 60px 0 0;
}
.blog-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.blog-footer__brand-name {
  font-family: var(--pxv-font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--pxv-white);
  margin-bottom: 12px;
}
.blog-footer__brand-name span { color: var(--pxv-indigo-light); }
.blog-footer__desc { font-size: .9rem; line-height: 1.7; margin-bottom: 20px; }
.blog-footer__socials { display: flex; gap: 12px; }
.blog-footer__social {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.6) !important;
  transition: all var(--pxv-transition);
}
.blog-footer__social:hover {
  border-color: var(--pxv-indigo-light);
  color: var(--pxv-indigo-light) !important;
  background: rgba(99,102,241,.1);
}

.blog-footer__col h4 {
  font-family: var(--pxv-font-heading);
  font-size: .85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--pxv-white);
  margin-bottom: 16px;
}
.blog-footer__col a {
  display: block;
  color: rgba(255,255,255,.6) !important;
  font-size: .88rem;
  margin-bottom: 10px;
  transition: color var(--pxv-transition);
}
.blog-footer__col a:hover { color: var(--pxv-white) !important; }

.blog-footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 20px 0;
  text-align: center;
  font-size: .82rem;
}
.blog-footer__bottom a { color: rgba(255,255,255,.5) !important; }
.blog-footer__bottom a:hover { color: var(--pxv-white) !important; }

/* ─── Empty State ──────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  grid-column: 1 / -1;
}
.empty-state__icon { font-size: 3rem; margin-bottom: 16px; }
.empty-state__title {
  font-family: var(--pxv-font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--pxv-dark);
  margin-bottom: 8px;
}
.empty-state__desc { color: var(--pxv-text-light); }

/* ─── Breadcrumbs ──────────────────────────────────────────── */
.breadcrumbs {
  padding: 16px 0;
  font-size: .82rem;
  color: var(--pxv-text-lighter);
}
.breadcrumbs a { color: var(--pxv-text-light); }
.breadcrumbs a:hover { color: var(--pxv-indigo); }
.breadcrumbs__sep { margin: 0 8px; }

/* ─── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .post-card--featured { grid-template-columns: 1fr; }
  .post-card--featured .post-card__image { aspect-ratio: 16/9; min-height: auto; }
  .blog-footer__inner { grid-template-columns: 1fr 1fr; }
  .related-posts__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .blog-nav__inner { flex-wrap: wrap; }
  .blog-nav__links,
  .blog-nav__search,
  .blog-nav__cta { display: none; }
  .blog-nav__burger { display: block; }

  /* Mobile menu open state */
  .blog-nav__links.show {
    display: flex;
    flex-direction: column;
    width: 100%;
    order: 10;
    gap: 0;
    padding: 12px 0 4px;
    border-top: 1px solid var(--pxv-border);
    margin-top: 12px;
  }
  .blog-nav__links.show li { width: 100%; }
  .blog-nav__links.show a {
    display: block;
    padding: 10px 0;
    font-size: .95rem;
  }
  .blog-nav__search.show {
    display: flex;
    width: 100%;
    order: 11;
    padding-bottom: 8px;
  }
  .blog-nav__cta.show {
    display: inline-flex;
    width: 100%;
    justify-content: center;
    order: 12;
    margin-bottom: 8px;
  }

  /* Burger animation */
  .blog-nav__burger.open span:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
  .blog-nav__burger.open span:nth-child(2) { opacity: 0; }
  .blog-nav__burger.open span:nth-child(3) { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

  .blog-grid { grid-template-columns: 1fr; gap: 20px; }
  .blog-hero { padding: 50px 0 40px; }
  .blog-hero__title { font-size: 1.8rem; }
  .blog-footer__inner { grid-template-columns: 1fr; gap: 28px; }
  .related-posts__grid { grid-template-columns: 1fr; }
  .post-single__title { font-size: 1.6rem; }
  .author-box { flex-direction: column; text-align: center; }
  .post-card--featured .post-card__body { padding: 20px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .category-bar { gap: 6px; }
  .category-pill { padding: 6px 14px; font-size: .8rem; }
  .post-card__body { padding: 16px; }
}