/* ═══════════════════════════════════════════════════════
   Blog — AI x Leaders charter (light theme, SPA-aligned)
   ═══════════════════════════════════════════════════════ */

/* ── Tokens (matching tokens-aix.jsx) ── */
:root {
  --ink: #0A0A0A;
  --paper: #FAF7F2;
  --white: #FFFFFF;
  --dim: #6B6B6B;
  --line: #1A1A1A;
  --line-soft: #E5E2DD;
  --hotpink: #FF4FD8;
  --electric: #2F6BFF;
  --orange: #FF6A00;
  --yellow: #F4C542;
  --violet: #7B61FF;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-heading: 'Inter Tight', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

/* ── Base reset for blog pages ── */
html, body {
  margin: 0;
  padding: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}
*, *::before, *::after { box-sizing: border-box; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--hotpink); color: var(--ink); }

/* ── Nav (matching SPA SiteNav) ── */
.blog-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
  padding: 18px 28px;
}
.blog-nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.blog-nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}
.blog-nav-logo img {
  width: 32px;
  height: 32px;
  display: block;
}
.blog-nav-logo span {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
}
.blog-nav-links {
  display: flex;
  gap: 22px;
  align-items: center;
}
.blog-nav-links a {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--dim);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.blog-nav-links a:hover,
.blog-nav-links a.active {
  color: var(--ink);
  font-weight: 700;
}
.blog-nav-links a.active {
  border-bottom-color: var(--ink);
}
.blog-nav-dropdown {
  position: relative;
  display: inline-flex;
}
.blog-nav-dropdown > a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.blog-nav-dropdown > a::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid var(--dim);
  transition: transform 160ms ease;
}
.blog-nav-dropdown:hover > a::after {
  transform: rotate(180deg);
}
.blog-nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: -14px;
  padding-top: 14px;
  z-index: 60;
  min-width: 320px;
}
.blog-nav-dropdown:hover .blog-nav-dropdown-menu {
  display: block;
}
.blog-nav-dropdown-menu-inner {
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 10px;
  box-shadow: 0 18px 36px rgba(10, 10, 10, 0.08);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.blog-nav-dropdown-menu-inner a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 14px;
  text-decoration: none;
  color: var(--ink);
  border-left: 2px solid transparent;
  font-weight: 400;
  transition: background 120ms ease, border-color 120ms ease;
}
.blog-nav-dropdown-menu-inner a:hover {
  background: #F6F6F6;
  border-left-color: var(--hotpink);
  font-weight: 400;
}
.blog-nav-dropdown-menu-inner .item-title {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.blog-nav-dropdown-menu-inner .item-desc {
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--dim);
  line-height: 1.4;
}
.blog-nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.blog-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--ink);
  background: transparent;
  transition: background 0.2s, color 0.2s;
}
.blog-nav-btn:hover {
  background: var(--ink);
  color: var(--paper);
}
.blog-nav-btn .dot {
  width: 6px;
  height: 6px;
  background: var(--hotpink);
  display: inline-block;
}
.blog-nav-btn-primary {
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
}
.blog-nav-btn-primary:hover {
  background: #333;
}

/* Mobile nav toggle */
.blog-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 11px 11px;
}
.blog-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}
.blog-hamburger span {
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.blog-nav.nav-open .blog-hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.blog-nav.nav-open .blog-hamburger span:nth-child(2) { opacity: 0; }
.blog-nav.nav-open .blog-hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
@media (max-width: 1150px) {
  .blog-nav-links, .blog-nav-right { display: none; }
  .blog-hamburger { display: block; }
}

/* ── Panneau menu mobile (construit par /js/nav.js) ── */
.blog-mobile-panel { display: none; }
@media (max-width: 1150px) {
  .blog-nav.nav-open .blog-mobile-panel { display: block; }
  .blog-mobile-panel {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--ink);
    max-height: calc(100vh - 70px);
    max-height: calc(100dvh - 70px);
    overflow-y: auto;
    box-shadow: 0 18px 36px rgba(10, 10, 10, 0.08);
  }
  .blog-mobile-panel .blog-nav-links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 20px 4px;
  }
  .blog-mobile-panel .blog-nav-links > a,
  .blog-mobile-panel .blog-nav-dropdown > a {
    display: flex;
    padding: 14px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--ink);
    border-bottom: 1px solid var(--line-soft);
  }
  .blog-mobile-panel .blog-nav-dropdown {
    display: block;
    position: static;
  }
  .blog-mobile-panel .blog-nav-dropdown > a::after { display: none; }
  .blog-mobile-panel .blog-nav-dropdown-menu {
    display: block;
    position: static;
    padding: 0;
    min-width: 0;
  }
  .blog-mobile-panel .blog-nav-dropdown-menu-inner {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 4px 0 10px;
  }
  .blog-mobile-panel .blog-nav-dropdown-menu-inner a {
    padding: 10px 0 10px 14px;
    border-left: 2px solid var(--line-soft);
  }
  .blog-mobile-panel .blog-nav-right {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 16px 20px 24px;
  }
  .blog-mobile-panel .blog-nav-btn {
    justify-content: center;
    padding: 13px 14px;
    font-size: 12px;
  }
}

/* ── Hero (charte : aligne a gauche, comme le Hero du site principal) ── */
.blog-hero {
  padding: 96px 28px 56px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
}
.blog-hero .container {
  max-width: 1280px;
  margin: 0 auto;
}
.blog-hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--hotpink);
  margin-bottom: 22px;
}
.blog-hero .eyebrow::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--hotpink);
  display: inline-block;
}
.blog-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 5.4vw, 4.2rem);
  font-weight: 800;
  color: var(--ink);
  line-height: 1.02;
  max-width: 1000px;
  margin: 0 0 24px;
  letter-spacing: -0.03em;
}
.blog-hero h1 em {
  font-style: italic;
  color: var(--hotpink);
}
.blog-hero .lead {
  font-family: var(--font-body);
  font-size: 18px;
  color: var(--dim);
  line-height: 1.6;
  max-width: 640px;
  margin: 0;
}
.blog-hero .meta {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--dim);
}
.blog-hero .meta a {
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--hotpink);
}

/* ── Proof strip (bandeau de stats sous le hero, charte) ── */
.blog-proof-strip {
  background: var(--paper);
  border-bottom: 1px solid var(--line-soft);
  padding: 32px 28px;
}
.blog-proof-strip .inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  align-items: baseline;
}
.blog-proof-strip .proof-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.blog-proof-strip .big {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 28px;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.blog-proof-strip .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dim);
}

/* ── Hero image ── */
.blog-hero-img {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 28px 0;
}
.blog-hero-img img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 8px;
  display: block;
}

/* ── Breadcrumb ── */
.blog-breadcrumb {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 28px 0;
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.02em;
}
.blog-breadcrumb a {
  color: var(--dim);
  text-decoration: none;
  transition: color 0.2s;
}
.blog-breadcrumb a:hover {
  color: var(--ink);
}
.blog-breadcrumb .sep {
  margin: 0 8px;
  opacity: 0.4;
}

/* ── Article content ── */
.blog-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 28px 80px;
}
.blog-content > p:first-of-type {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--ink);
  margin-bottom: 32px;
}
.blog-content > p:first-of-type::first-letter {
  font-family: var(--font-heading);
  font-size: 3.2rem;
  font-weight: 800;
  float: left;
  line-height: 1;
  margin: 6px 12px 0 0;
  color: var(--hotpink);
}
.blog-content h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 2.5vw, 1.8rem);
  font-weight: 700;
  color: var(--ink);
  margin: 56px 0 20px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  padding-left: 18px;
  border-left: 3px solid var(--hotpink);
}
.blog-content p {
  font-family: var(--font-body);
  font-size: 17px;
  color: #333;
  line-height: 1.8;
  margin: 0 0 24px;
}
.blog-content strong {
  color: var(--ink);
  font-weight: 600;
}
.blog-content a {
  color: var(--hotpink);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.blog-content a:hover {
  color: var(--violet);
}
.blog-content ul, .blog-content ol {
  padding-left: 24px;
  margin: 0 0 24px;
}
.blog-content li {
  font-size: 17px;
  color: #333;
  line-height: 1.8;
  margin-bottom: 8px;
}
.blog-content li::marker {
  color: var(--hotpink);
}

/* ── CTA block ── */
.blog-cta {
  margin: 56px 0 40px;
  padding: 40px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  text-align: center;
}
.blog-cta p {
  margin: 0 0 24px;
  color: #333;
  font-size: 17px;
  line-height: 1.7;
}
.blog-cta .cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--ink);
  transition: background 0.2s;
}
.blog-cta .cta-btn::after {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--hotpink);
  display: inline-block;
}
.blog-cta .cta-btn:hover {
  background: #333;
}

/* ── FAQ section (accordion) ── */
.blog-faq {
  margin: 56px 0 0;
  padding: 48px 0 0;
  border-top: 1px solid var(--line-soft);
}
.blog-faq > h2 {
  border-left: none;
  padding-left: 0;
  text-align: center;
  margin-bottom: 32px;
}
.blog-faq .faq-item {
  margin-bottom: 12px;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  transition: border-color 0.2s;
}
.blog-faq .faq-item:hover {
  border-color: var(--hotpink);
}
.blog-faq .faq-item summary {
  padding: 24px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.blog-faq .faq-item summary::-webkit-details-marker { display: none; }
.blog-faq .faq-item summary::after {
  content: '+';
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--hotpink);
  flex-shrink: 0;
  transition: transform 0.2s;
}
.blog-faq .faq-item[open] summary::after {
  content: '\2212';
}
.blog-faq .faq-item h3 {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.blog-faq .faq-item h3::after {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--hotpink);
  display: inline-block;
  margin-left: 6px;
  vertical-align: middle;
}
.blog-faq .faq-item .faq-answer {
  padding: 0 24px 24px;
}
.blog-faq .faq-item p {
  font-size: 15px;
  color: #555;
  margin: 0;
  line-height: 1.7;
}

/* ── Blog index ── */
.blog-index-grid {
  display: grid;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 28px 80px;
}
.blog-card {
  display: block;
  padding: 36px 40px;
  background: var(--white);
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  border: 1px solid var(--line-soft);
  position: relative;
}
.blog-card:hover {
  border-color: var(--hotpink);
  box-shadow: 0 8px 32px rgba(10,10,10,0.06);
}
.blog-card .card-category {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--hotpink);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.blog-card .card-category::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--hotpink);
  display: inline-block;
}
.blog-card h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 14px;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.blog-card p {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--dim);
  line-height: 1.7;
  margin: 0 0 20px;
}
.blog-card .card-meta {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--dim);
}
.blog-card .card-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-top: 8px;
  transition: gap 0.2s;
}
.blog-card .card-arrow::after {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--hotpink);
  display: inline-block;
}
.blog-card:hover .card-arrow {
  gap: 12px;
}

.blog-card .card-thumb {
  width: 100%;
  border-radius: 8px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  margin-bottom: 12px;
}

/* ── Footer (matching SPA SiteFooter) ── */
.blog-footer {
  background: var(--ink);
  color: var(--paper);
  padding: 64px 28px 32px;
}
.blog-footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 36px;
}
.blog-footer-brand {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.blog-footer-brand .logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.blog-footer-brand .logo img {
  width: 36px;
  height: 36px;
}
.blog-footer-brand .logo span {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}
.blog-footer-brand .tagline {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 20px;
  color: var(--paper);
  max-width: 380px;
  line-height: 1.28;
  letter-spacing: -0.01em;
}
.blog-footer-brand .tagline .accent {
  color: var(--hotpink);
}
.blog-footer-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  align-self: flex-start;
  padding: 12px 22px;
  background: var(--hotpink);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--hotpink);
  transition: background 0.2s, border-color 0.2s;
}
.blog-footer-cta:hover {
  background: transparent;
  border-color: var(--paper);
  color: var(--paper);
}
.blog-footer-col h4 {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--hotpink);
  margin: 0 0 14px;
}
.blog-footer-col h4::before {
  content: '· ';
}
.blog-footer-col a {
  display: block;
  font-family: var(--font-body);
  font-size: 14px;
  color: #cfcfcf;
  text-decoration: none;
  padding: 5px 0;
  margin-bottom: 2px;
  transition: color 0.2s;
}
.blog-footer-col a:hover {
  color: var(--paper);
}
.blog-footer-col a.sub {
  font-size: 13px;
  color: #8a8a8a;
  padding-left: 14px;
}
.blog-footer-col .ext {
  color: var(--hotpink);
  font-size: 11px;
}
.blog-footer-bottom {
  max-width: 1280px;
  margin: 64px auto 0;
  border-top: 1px solid #2A2A2A;
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  color: #888;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.blog-footer-legal {
  max-width: 1280px;
  margin: 14px auto 0;
  text-align: center;
  font-family: var(--font-body);
  font-size: 11px;
  color: #777;
  letter-spacing: 0.04em;
}


/* ── Articles croisés (bas d'article) ── */
.blog-related {
  margin: 48px 0 8px;
}
.blog-related h2 {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 20px;
  padding-left: 18px;
  border-left: 3px solid var(--hotpink);
}
.blog-related .related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}
.blog-related .related-card {
  display: block;
  border: 1px solid var(--line-soft);
  background: var(--white);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.2s;
}
.blog-related .related-card:hover {
  border-color: var(--ink);
}
.blog-related .related-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}
.blog-related .related-card .rt {
  display: block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.35;
  padding: 12px 14px;
  color: var(--ink);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .blog-hero { padding: 80px 20px 36px; }
  .blog-content { padding: 32px 20px 60px; }
  .blog-content > p:first-of-type { font-size: 1.1rem; }
  .blog-content > p:first-of-type::first-letter { font-size: 2.6rem; }
  .blog-content h2 { margin-top: 40px; }
  .blog-cta { padding: 28px 20px; }
  .blog-card { padding: 28px 20px; }
  .blog-faq .faq-item summary { padding: 18px; }
  .blog-index-grid { padding: 32px 20px 60px; }
  .blog-proof-strip { padding: 24px 20px; }
  .blog-breadcrumb { padding: 24px 20px 0; }
  .blog-footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .blog-footer-inner { grid-template-columns: 1fr; }
}