/* DriftLine Blog — Clean, AEO-optimized styling */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --color-bg: #0a0f1a;
  --color-surface: #111827;
  --color-surface-hover: #1a2332;
  --color-border: #1e293b;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-accent: #38bdf8;
  --color-accent-hover: #7dd3fc;
  --color-link: #38bdf8;
  --color-heading: #f1f5f9;
  --font-display: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --max-width: 760px;
  --max-width-wide: 1100px;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* — Navigation — */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 15, 26, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 1.5rem;
}

.nav-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-heading);
  text-decoration: none;
}

.nav-logo span { color: var(--color-accent); }

.nav-links { display: flex; gap: 1.5rem; }

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--color-accent); }

/* — Article Layout — */
.article-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

/* — Article Header — */
.article-header { margin-bottom: 2.5rem; }

.article-category {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-heading);
  margin-bottom: 1rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* — Direct Answer Summary — */
.direct-answer {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(56, 189, 248, 0.03));
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text);
}

/* — Article Content — */
.article-content h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-heading);
  margin: 2.5rem 0 1rem;
  line-height: 1.25;
}

.article-content h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-heading);
  margin: 2rem 0 0.75rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content strong {
  color: var(--color-heading);
  font-weight: 600;
}

.article-content a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content a:hover { color: var(--color-accent-hover); }

.article-content ul, .article-content ol {
  margin: 0.75rem 0 1.25rem 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content li::marker {
  color: var(--color-accent);
}

/* — Tables — */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
  overflow-x: auto;
  display: block;
}

.article-content thead th {
  background: var(--color-surface);
  color: var(--color-heading);
  font-weight: 600;
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

.article-content tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.article-content tbody tr:hover {
  background: var(--color-surface-hover);
}

/* — Horizontal Rule — */
.article-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5rem 0;
}

/* — FAQ Section — */
.article-content h2:has(+ h3) { /* FAQ heading */ }

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  background: var(--color-surface);
}

.faq-item h3 {
  margin-top: 0;
  font-size: 1.05rem;
}

/* — CTA Section — */
.cta-section {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(56, 189, 248, 0.03));
  border: 1px solid rgba(56, 189, 248, 0.15);
  border-radius: 12px;
  padding: 2rem;
  margin: 3rem 0;
  text-align: center;
}

.cta-section h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--color-heading);
  margin-bottom: 0.75rem;
}

.cta-section p {
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
}

.cta-button {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
  padding: 0.75rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  transition: background 0.15s;
}

.cta-button:hover { background: var(--color-accent-hover); }

/* — Footer — */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer a {
  color: var(--color-accent);
  text-decoration: none;
}

/* — Index Page — */
.index-container {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.index-hero {
  text-align: center;
  margin-bottom: 3rem;
}

.index-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: 0.75rem;
}

.index-hero p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}

.article-card .card-category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.article-card h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.article-card p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
}

.article-card .card-meta {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* — Responsive — */
@media (max-width: 640px) {
  .article-container { padding: 2rem 1rem 3rem; }
  .nav { padding: 0.75rem 1rem; }
  .nav-links { gap: 1rem; }
  .article-content h2 { font-size: 1.35rem; }
  .articles-grid { grid-template-columns: 1fr; }
}