/* ===== HOME PAGE STYLES ===== */
/* index.html only */

/* Category colors */
:root {
  --cat-ai: #e8913a;
  --cat-ai-dim: #e8913a25;
  --cat-llm: #58a6ff;
  --cat-llm-dim: #58a6ff25;
  --cat-oss: #3fb950;
  --cat-oss-dim: #3fb95025;
  --cat-reg: #ef4444;
  --cat-reg-dim: #ef444425;
  --cat-ind: #c084fc;
  --cat-ind-dim: #c084fc25;
}

/* Main override — wider for home */
main { max-width: 1060px; }

/* ===== HERO EXTRAS ===== */
.hero-logo {
  width: 128px;
  height: auto;
  margin-bottom: 1.5rem;
  opacity: 0.9;
}
.hero-categories {
  display: flex; justify-content: center; gap: 0.6rem;
  margin-bottom: 2rem; flex-wrap: wrap;
}
.hero-cat-pill {
  font-family: var(--mono); font-size: 0.6rem; font-weight: 600;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.28rem 0.7rem; border-radius: 20px;
  border: 1px solid; opacity: 0.7;
}

/* ===== CATEGORY BADGE ===== */
.cat-badge {
  display: inline-block;
  font-family: var(--mono); font-size: 0.62rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.22rem 0.6rem; border-radius: 3px; margin-bottom: 0.8rem;
}
.cat-badge.ai { background: var(--cat-ai-dim); color: var(--cat-ai); }
.cat-badge.llm { background: var(--cat-llm-dim); color: var(--cat-llm); }
.cat-badge.oss { background: var(--cat-oss-dim); color: var(--cat-oss); }
.cat-badge.reg { background: var(--cat-reg-dim); color: var(--cat-reg); }
.cat-badge.ind { background: var(--cat-ind-dim); color: var(--cat-ind); }

/* ===== FEATURED CARD ===== */
.featured-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s, transform 0.3s;
}
.featured-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft), transparent);
}
.featured-card:hover {
  border-color: var(--accent-soft);
  transform: translateY(-2px);
}
.featured-meta {
  display: flex; align-items: center; gap: 1rem;
  margin-bottom: 1.2rem;
}
.featured-date {
  font-family: var(--mono); font-size: 0.72rem;
  color: var(--text-tertiary); letter-spacing: 0.04em;
}
.featured-title {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 400; line-height: 1.2;
  letter-spacing: -0.02em; margin-bottom: 1rem;
}
.featured-title a {
  color: var(--text-hero); text-decoration: none;
  transition: color 0.2s;
}
.featured-title a:hover { color: var(--accent); }
.featured-excerpt {
  font-size: 1.05rem; line-height: 1.72;
  color: var(--text-secondary); margin-bottom: 1.5rem;
  max-width: 820px;
}
.featured-footer {
  font-family: var(--mono); font-size: 0.7rem;
  color: var(--text-tertiary); letter-spacing: 0.04em;
  display: flex; gap: 0.8rem; align-items: center;
}
.featured-footer .dot { color: var(--border-light); }

/* ===== CATEGORY FILTER ===== */
.filter-bar {
  display: flex; gap: 0.5rem; flex-wrap: wrap;
  margin-bottom: 2.5rem;
}
.filter-pill {
  font-family: var(--mono); font-size: 0.68rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 0.45rem 1rem; border-radius: 20px;
  border: 1px solid var(--border); background: transparent;
  color: var(--text-secondary); cursor: pointer;
  transition: all 0.3s;
}
.filter-pill:hover {
  border-color: var(--accent-soft); color: var(--accent);
  background: var(--accent-glow);
}
.filter-pill.active {
  border-color: var(--accent); background: var(--accent-dim);
  color: var(--accent);
}

/* ===== POSTS GRID ===== */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
}
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.8rem;
  position: relative; overflow: hidden;
  display: flex; flex-direction: column;
  transition: border-color 0.3s, transform 0.3s, opacity 0.3s;
  opacity: 1;
}
.post-card:hover {
  border-color: var(--accent-soft);
  transform: translateY(-4px);
}
.post-card.hide {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
  position: absolute;
  visibility: hidden;
}
.post-title {
  font-family: var(--serif);
  font-size: 1.12rem; font-weight: 400;
  line-height: 1.3; letter-spacing: -0.01em;
  margin-bottom: 0.8rem;
}
.post-title a {
  color: var(--text-hero); text-decoration: none;
  transition: color 0.2s;
}
.post-title a:hover { color: var(--accent); }
.post-excerpt {
  font-size: 0.88rem; line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 1.2rem; flex-grow: 1;
}
.post-meta {
  font-family: var(--mono); font-size: 0.66rem;
  color: var(--text-tertiary); letter-spacing: 0.03em;
  display: flex; gap: 0.6rem; align-items: center;
  margin-top: auto;
}
.post-meta .dot { color: var(--border-light); }

/* ===== TOPIC STATS ===== */
.topic-stats {
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 1rem; margin: 2rem 0 0;
}
.topic-stat {
  text-align: center; padding: 1.2rem 0.5rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px; position: relative; overflow: hidden;
}
.topic-stat::before {
  content: ''; position: absolute;
  top: 0; left: 0; right: 0; height: 2px;
}
.topic-stat.ai::before { background: var(--cat-ai); }
.topic-stat.llm::before { background: var(--cat-llm); }
.topic-stat.oss::before { background: var(--cat-oss); }
.topic-stat.reg::before { background: var(--cat-reg); }
.topic-stat.ind::before { background: var(--cat-ind); }
.topic-count {
  font-family: var(--mono); font-size: 1.8rem; font-weight: 700;
  line-height: 1; margin-bottom: 0.3rem;
}
.topic-stat.ai .topic-count { color: var(--cat-ai); }
.topic-stat.llm .topic-count { color: var(--cat-llm); }
.topic-stat.oss .topic-count { color: var(--cat-oss); }
.topic-stat.reg .topic-count { color: var(--cat-reg); }
.topic-stat.ind .topic-count { color: var(--cat-ind); }
.topic-label {
  font-family: var(--mono); font-size: 0.6rem; font-weight: 600;
  color: var(--text-tertiary); letter-spacing: 0.08em; text-transform: uppercase;
}

/* ===== ABOUT ===== */
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2.5rem;
  position: relative; overflow: hidden;
  max-width: 740px; margin: 0 auto;
}
.about-card::before {
  content: '';
  position: absolute; top: 0; left: 0;
  width: 3px; height: 100%;
  background: linear-gradient(to bottom, var(--accent), var(--accent-soft), transparent);
}
.about-card h2 { margin-bottom: 1.2rem; }
.about-card p {
  font-size: 0.95rem; line-height: 1.72;
  color: var(--text-primary); margin-bottom: 1rem;
}
.about-card p:last-child { margin-bottom: 0; }
.about-card p.about-coda {
  font-family: var(--mono); font-size: 0.82rem;
  color: var(--accent); margin-top: 1.5rem;
  padding-top: 1.2rem; border-top: 1px solid var(--border);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 860px) {
  .posts-grid { grid-template-columns: repeat(2, 1fr); }
  .topic-stats { grid-template-columns: repeat(3, 1fr); }
  .featured-card { padding: 1.8rem; }
}
@media (max-width: 560px) {
  .posts-grid { grid-template-columns: 1fr; }
  .topic-stats { grid-template-columns: repeat(2, 1fr); }
  .featured-card { padding: 1.4rem; }
  .featured-title { font-size: 1.4rem; }
  .filter-bar { gap: 0.4rem; }
  .filter-pill { font-size: 0.6rem; padding: 0.35rem 0.7rem; }

  /* ===== Compact hero for mobile ===== */
  .hero { padding: 1.5rem 1.5rem 2rem; }
  .hero-logo { width: 72px; margin-bottom: 1rem; }
  .hero-pub { margin-bottom: 1.2rem; }
  .hero-categories { gap: 0.4rem; margin-bottom: 1.2rem; }
  .hero-sub { margin-bottom: 1.5rem; }
  .hero-meta {
    flex-direction: column;
    gap: 0.25rem;
  }
  .hero-meta .dot { display: none; }
  .scroll-hint {
    position: static;
    transform: none;
    margin-top: 1.5rem;
  }
}