/* ============================================================
   BLOG SECTION — Polished showcase (v2)
   • Featured card + 5 supporting cards on desktop
   • Topic filter chips
   • Mobile: horizontal snap-scroll carousel for tactile feel
   ============================================================ */

.blog-section {
  position: relative;
  padding: 100px 0 80px;
  background: #0a0b1e;
  overflow: hidden;
  isolation: isolate;
}

/* Animated background mesh */
.blog-section::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 500px at 15% 10%, rgba(99, 102, 241, 0.25), transparent 60%),
    radial-gradient(800px 500px at 85% 90%, rgba(236, 72, 153, 0.18), transparent 60%),
    radial-gradient(700px 400px at 50% 50%, rgba(6, 182, 212, 0.15), transparent 70%);
  z-index: -1;
  animation: blogMeshDrift 18s ease-in-out infinite alternate;
}

@keyframes blogMeshDrift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(-30px, 20px, 0) scale(1.05); }
}

/* Grid pattern overlay */
.blog-section::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: -1;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.blog-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Header */
.blog-head {
  text-align: center;
  margin-bottom: 44px;
}

.blog-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  color: #c7d2fe;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.blog-eyebrow .blog-spark {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #06b6d4);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.8);
  animation: blogSpark 2s ease-in-out infinite;
}

@keyframes blogSpark {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.3); opacity: 0.7; }
}

.blog-title {
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: #fff;
  margin: 0 0 16px;
}

.blog-title .blog-grad {
  background: linear-gradient(90deg, #818cf8 0%, #06b6d4 30%, #f472b6 70%, #fbbf24 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: blogGradShift 6s linear infinite;
}

@keyframes blogGradShift { to { background-position: 200% center; } }

.blog-sub {
  color: #94a3b8;
  font-size: 17px;
  max-width: 620px;
  margin: 0 auto 24px;
  line-height: 1.6;
}

/* ---------- Topic filter chips ---------- */
.blog-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.blog-chip {
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.04);
  color: #cbd5e1;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  white-space: nowrap;
}

.blog-chip:hover {
  background: rgba(255, 255, 255, 0.09);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.blog-chip.is-active {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 8px 24px -10px rgba(99, 102, 241, 0.7);
}

/* ---------- Grid ---------- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* Featured (first) card spans 2 cols × 2 rows */
.blog-card.is-featured {
  grid-column: span 2;
  grid-row: span 2;
}

.blog-card {
  position: relative;
  border-radius: 22px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition:
    transform 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.4s ease,
    box-shadow 0.4s ease,
    opacity 0.4s ease;
  cursor: pointer;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.blog-card.is-featured { min-height: 504px; }

.blog-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--blog-grad, linear-gradient(135deg, #6366f1, #06b6d4));
  opacity: 0;
  transition: opacity 0.45s ease;
  z-index: 0;
}

.blog-card:hover {
  transform: translateY(-8px);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow:
    0 30px 60px -20px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 0 40px var(--blog-glow, rgba(99, 102, 241, 0.3));
}

.blog-card:hover::before { opacity: 0.15; }

/* Hidden by filter */
.blog-card.is-hidden {
  opacity: 0;
  transform: scale(0.96);
  pointer-events: none;
  display: none;
}

/* Shimmer line on hover */
.blog-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blog-line, #6366f1), transparent);
  transition: left 0.7s ease;
  z-index: 3;
}

.blog-card:hover::after { left: 100%; }

/* Visual area */
.blog-card-visual {
  position: relative;
  height: 180px;
  overflow: hidden;
  background: var(--blog-bg, linear-gradient(135deg, #1e1b4b, #312e81));
  flex-shrink: 0;
}

.blog-card.is-featured .blog-card-visual { height: 280px; }

.blog-card-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(255,255,255,0.15), transparent 50%),
    radial-gradient(circle at 70% 70%, rgba(255,255,255,0.1), transparent 50%);
}

/* Light-sweep on hover */
.blog-card-shine {
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255,255,255,0.18) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.9s ease;
  pointer-events: none;
  z-index: 2;
}
.blog-card:hover .blog-card-shine { transform: translateX(120%); }

/* Decorative glyph */
.blog-card-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 72px;
  font-weight: 900;
  color: rgba(255,255,255,0.15);
  letter-spacing: -0.06em;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1), color 0.4s ease;
}

.blog-card.is-featured .blog-card-icon { font-size: 120px; }

.blog-card:hover .blog-card-icon {
  transform: scale(1.1) rotate(-3deg);
  color: rgba(255,255,255,0.28);
}

/* Floating dots decoration */
.blog-card-visual .blog-dots {
  position: absolute;
  top: 16px;
  right: 16px;
  display: flex;
  gap: 6px;
}

.blog-card-visual .blog-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
}

/* Category badge */
.blog-cat {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 6px 12px;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 999px;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  z-index: 2;
}

/* Content */
.blog-card-body {
  padding: 22px 22px 24px;
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-card.is-featured .blog-card-body { padding: 32px; }

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: #94a3b8;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.blog-card-meta .blog-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #64748b;
}

.blog-card-heading {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin: 0 0 10px;
}

.blog-card.is-featured .blog-card-heading {
  font-size: 26px;
  margin-bottom: 14px;
}

.blog-card-desc {
  font-size: 13.5px;
  color: #94a3b8;
  line-height: 1.6;
  margin: 0 0 16px;
  flex: 1;
}

.blog-card.is-featured .blog-card-desc { font-size: 15px; }

.blog-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: #c7d2fe;
  margin-top: auto;
  transition: color 0.3s ease, gap 0.3s ease;
}

.blog-card:hover .blog-card-link {
  color: #fff;
  gap: 12px;
}

.blog-card-link .blog-arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}

.blog-card:hover .blog-card-link .blog-arrow { transform: translateX(4px); }

/* Empty state for filtering */
.blog-empty {
  text-align: center;
  color: #94a3b8;
  font-size: 15px;
  margin: 24px auto 0;
  padding: 24px;
  border: 1px dashed rgba(255,255,255,0.15);
  border-radius: 16px;
}

/* CTA at bottom */
.blog-cta-row {
  display: flex;
  justify-content: center;
  margin-top: 48px;
}

.blog-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  border-radius: 999px;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 10px 30px -10px rgba(99, 102, 241, 0.6);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.blog-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px -10px rgba(99, 102, 241, 0.8);
}

/* Card-specific palettes */
.blog-card-1 { --blog-bg: linear-gradient(135deg, #1e1b4b, #312e81 50%, #4338ca); --blog-glow: rgba(99,102,241,0.4); --blog-line: #818cf8; --blog-grad: linear-gradient(135deg, #6366f1, #06b6d4); }
.blog-card-2 { --blog-bg: linear-gradient(135deg, #042f2e, #064e3b 50%, #047857); --blog-glow: rgba(16,185,129,0.4); --blog-line: #34d399; --blog-grad: linear-gradient(135deg, #10b981, #06b6d4); }
.blog-card-3 { --blog-bg: linear-gradient(135deg, #4c0519, #831843 50%, #be185d); --blog-glow: rgba(236,72,153,0.4); --blog-line: #f472b6; --blog-grad: linear-gradient(135deg, #ec4899, #f59e0b); }
.blog-card-4 { --blog-bg: linear-gradient(135deg, #422006, #78350f 50%, #b45309); --blog-glow: rgba(245,158,11,0.4); --blog-line: #fbbf24; --blog-grad: linear-gradient(135deg, #f59e0b, #ec4899); }
.blog-card-5 { --blog-bg: linear-gradient(135deg, #082f49, #0c4a6e 50%, #0369a1); --blog-glow: rgba(6,182,212,0.4); --blog-line: #67e8f9; --blog-grad: linear-gradient(135deg, #06b6d4, #6366f1); }
.blog-card-6 { --blog-bg: linear-gradient(135deg, #2e1065, #4c1d95 50%, #6d28d9); --blog-glow: rgba(139,92,246,0.4); --blog-line: #c4b5fd; --blog-grad: linear-gradient(135deg, #8b5cf6, #ec4899); }

/* Reveal-on-scroll */
.blog-card {
  opacity: 0;
  transform: translateY(30px);
  transition:
    opacity 0.6s ease,
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    border-color 0.4s ease,
    box-shadow 0.4s ease;
}

.blog-card.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

.blog-card.is-revealed:hover { transform: translateY(-8px); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .blog-card.is-featured { grid-column: span 2; grid-row: auto; min-height: 380px; }
  .blog-card.is-featured .blog-card-visual { height: 220px; }
  .blog-card.is-featured .blog-card-icon { font-size: 92px; }
}

/* Mobile — horizontal snap carousel for tactile, native swiping */
@media (max-width: 720px) {
  .blog-section { padding: 70px 0 60px; }
  .blog-head { margin-bottom: 28px; }
  .blog-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    padding: 4px 16px 8px;
    margin-left: -16px;
    margin-right: -16px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .blog-filters::-webkit-scrollbar { display: none; }
  .blog-chip { scroll-snap-align: start; font-size: 12.5px; padding: 8px 14px; }

  .blog-grid {
    display: flex;
    grid-template-columns: none;
    gap: 16px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scroll-padding: 16px;
    padding: 4px 8px 24px;
    margin: 0 -16px;
    scrollbar-width: none;
  }
  .blog-grid::-webkit-scrollbar { display: none; }

  .blog-card,
  .blog-card.is-featured {
    grid-column: auto;
    grid-row: auto;
    flex: 0 0 84%;
    max-width: 84%;
    min-height: 420px;
    scroll-snap-align: center;
  }

  .blog-card-visual,
  .blog-card.is-featured .blog-card-visual { height: 160px; }
  .blog-card.is-featured .blog-card-icon { font-size: 80px; }
  .blog-card.is-featured .blog-card-heading { font-size: 20px; }
  .blog-card.is-featured .blog-card-body { padding: 22px; }
  .blog-card-heading { font-size: 17px; }
  .blog-card-desc    { font-size: 13px; }

  .blog-cta-row { margin-top: 28px; }
  .blog-cta-btn { width: 100%; max-width: 320px; justify-content: center; }
}

@media (max-width: 420px) {
  .blog-card,
  .blog-card.is-featured { flex: 0 0 88%; max-width: 88%; }
}

@media (prefers-reduced-motion: reduce) {
  .blog-section::before,
  .blog-title .blog-grad,
  .blog-eyebrow .blog-spark { animation: none !important; }
  .blog-card,
  .blog-card:hover { transform: none !important; }
}