/* ==========================================================================
   STOXLITIX RESEARCH BLOG STYLE SHEET
   Visual System: Clean-tech, High-Contrast Light Theme
   ========================================================================== */

:root {
  --c-bg: #FFFFFF;
  --c-bg-card: #FAF9F6;
  --c-primary: #0f3d66;
  --c-secondary: #565D6D;
  --c-gold: #f8b319;
  --c-border: #E5E5EA;
  --c-muted: #8E95A5;
  
  --font-title: 'Aspekta', 'Instrument Sans', sans-serif;
  --font-body: 'Instrument Sans', sans-serif;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--c-bg);
  color: var(--c-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrapper {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Navigation Header --- */
.header {
  border-bottom: 1px solid var(--c-border);
  padding: 20px 0;
  background: var(--c-bg);
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 20px;
  text-decoration: none;
  letter-spacing: 0.05em;
}
.logo-o { color: #f8b319; }
.logo-c { color: #0f3d66; }

.topbar-nav ul {
  display: flex;
  list-style: none;
  gap: 32px;
}
.topbar-nav a {
  text-decoration: none;
  color: var(--c-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
}
.topbar-nav a:hover {
  color: var(--c-primary);
}

/* --- Hero Section --- */
.blog-hero {
  padding: 64px 0 40px 0;
  border-bottom: 1px solid var(--c-border);
}
.eyebrow {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-gold);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.hero-title {
  font-family: var(--font-title);
  font-size: 40px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--c-primary);
}
.hero-desc {
  font-size: 16px;
  color: var(--c-secondary);
  max-width: 600px;
}

/* --- Filter Bar --- */
.filter-bar {
  display: flex;
  gap: 12px;
  margin: 32px 0;
  flex-wrap: wrap;
}
.filter-btn {
  background: none;
  border: 1px solid var(--c-border);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}
.filter-btn.active, .filter-btn:hover {
  background-color: var(--c-primary);
  border-color: var(--c-primary);
  color: #FFFFFF;
}

/* --- Article Grid --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
  margin-bottom: 80px;
}
.blog-card {
  background-color: #FFFFFF;
  border: 1px solid var(--c-border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.blog-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-gold);
  box-shadow: 0 10px 30px rgba(15, 61, 102, 0.05);
}
.blog-card-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}
.blog-tag {
  align-self: flex-start;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--c-primary);
  background-color: var(--c-bg-card);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.blog-card-title {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--c-primary);
}
.blog-card-excerpt {
  font-size: 14px;
  color: var(--c-secondary);
  margin-bottom: 24px;
  flex-grow: 1;
}
.blog-meta {
  font-size: 12px;
  color: var(--c-muted);
  font-weight: 500;
}

/* --- Detailed Article Layout --- */
.article-header {
  padding: 64px 0 40px 0;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 48px;
}
.article-title {
  font-family: var(--font-title);
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin: 16px 0;
}
.article-container {
  max-width: 680px;
  margin: 0 auto 80px auto;
  padding: 0 16px;
}
.article-content p {
  font-size: 17px;
  line-height: 1.75;
  color: var(--c-secondary);
  margin-bottom: 24px;
}
.article-content h2 {
  font-family: var(--font-title);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-primary);
  margin: 40px 0 16px 0;
}

/* --- AEO Highlights --- */
.aeo-highlight-card {
  background-color: var(--c-bg-card);
  border-left: 3px solid var(--c-gold);
  padding: 18px 24px;
  margin: 32px 0;
  border-radius: 0 4px 4px 0;
  font-size: 15px;
  color: var(--c-primary);
}
.aeo-highlight-card strong {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-primary);
}

/* --- Compliance Footer Bar --- */
.compliance-shield {
  background-color: var(--c-bg-card);
  border-top: 1px solid var(--c-border);
  padding: 32px 0;
  font-size: 13px;
  color: var(--c-secondary);
  text-align: center;
}
.compliance-shield p {
  max-width: 800px;
  margin: 0 auto;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--c-border);
  padding: 40px 0;
  font-size: 13px;
  color: var(--c-muted);
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 768px) {
  .topbar {
    flex-direction: column;
    gap: 16px;
  }
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 32px;
  }
  .article-title {
    font-size: 28px;
  }
}