/* ============================================================
   index.css — Home page specific styles
   ============================================================ */

/* ------------ Hero ---------------------------------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--navbar-height);
}

/* Subtle grid background */
.hero__bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(124, 92, 252, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 92, 252, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

/* Floating particle dots */
.hero__particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero__particle {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0;
  animation: floatParticle linear infinite;
}
@keyframes floatParticle {
  0%   { opacity: 0; transform: translateY(0) scale(1); }
  10%  { opacity: 0.6; }
  90%  { opacity: 0.2; }
  100% { opacity: 0; transform: translateY(-80px) scale(0.5); }
}

.hero__content {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-16);
  align-items: center;
  padding-block: var(--sp-20);
  z-index: 1;
}

.hero__text {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.hero__eyebrow {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-accent);
  letter-spacing: 0.04em;
}

.hero__title {
  font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.hero__subtitle {
  font-size: var(--font-size-md);
  color: var(--color-text-muted);
  line-height: var(--line-height-loose);
  max-width: 48ch;
}

.hero__cta {
  display: flex;
  gap: var(--sp-4);
  flex-wrap: wrap;
  margin-top: var(--sp-2);
}

.hero__socials {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-2);
}

.hero__social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
  text-decoration: none;
  width: fit-content;
}
.hero__social-link:hover { color: var(--color-primary-lt); }
.hero__social-link svg { flex-shrink: 0; }

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Neural network SVG */
.hero__neural-network {
  position: relative;
  width: 300px;
  height: 300px;
}

.hero__nn-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 12px rgba(124, 92, 252, 0.3));
}

.nn-line {
  stroke: var(--color-primary);
  stroke-width: 1;
  opacity: 0.35;
  transition: opacity var(--transition-slow);
}
.nn-line--accent {
  stroke: var(--color-accent);
  opacity: 0.3;
}
.nn-node {
  transition: r 0.3s ease, opacity 0.3s ease;
}
.nn-node--input {
  fill: var(--color-primary);
  filter: drop-shadow(0 0 4px rgba(124, 92, 252, 0.8));
  animation: nodePulse 3s ease-in-out infinite;
}
.nn-node--hidden {
  fill: var(--color-primary-lt);
  filter: drop-shadow(0 0 6px rgba(167, 139, 250, 0.6));
  animation: nodePulse 3s ease-in-out infinite 0.5s;
}
.nn-node--output {
  fill: var(--color-accent);
  filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.7));
  animation: nodePulse 3s ease-in-out infinite 1s;
}

@keyframes nodePulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

.hero__scroll-hint {
  position: absolute;
  bottom: var(--sp-8);
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-text-faint);
  animation: bounce 2s ease-in-out infinite;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(6px); }
}

/* ------------ About Section ------------------------------- */
.about-section {
  padding-block: var(--sp-20);
  background: var(--color-bg-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--sp-12);
  align-items: start;
  margin-top: var(--sp-8);
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.about-text p {
  color: var(--color-text-muted);
  line-height: var(--line-height-loose);
  font-size: var(--font-size-md);
}
.about-text strong { color: var(--color-text); }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-4);
  min-width: 260px;
}

.stat-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-5) var(--sp-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-1);
  text-align: center;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.stat-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.stat-number {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
}

/* ------------ Recent Posts -------------------------------- */
.recent-posts {
  padding-block: var(--sp-20);
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--sp-8);
  flex-wrap: wrap;
  gap: var(--sp-4);
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
}

.post-preview-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
  text-decoration: none;
  color: inherit;
}
.post-preview-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.post-preview-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.post-preview-card__date {
  font-size: var(--font-size-xs);
  color: var(--color-text-faint);
}

.post-preview-card__tags {
  display: flex;
  gap: var(--sp-1);
  flex-wrap: wrap;
}

.post-preview-card__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

.post-preview-card__excerpt {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: var(--line-height-loose);
  flex: 1;
  /* Clamp to 3 lines */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-preview-card__read-more {
  font-size: var(--font-size-xs);
  color: var(--color-primary-lt);
  font-weight: var(--font-weight-medium);
  margin-top: auto;
}

/* ------------ Responsive ---------------------------------- */
@media (max-width: 900px) {
  .hero__content {
    grid-template-columns: 1fr;
    gap: var(--sp-10);
    padding-block: var(--sp-16);
  }
  .hero__visual { display: none; }

  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-stats {
    grid-template-columns: repeat(4, 1fr);
    min-width: unset;
  }

  .posts-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .hero__cta { flex-direction: column; }
  .posts-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}