/* =============================================================================
   usulnet Articles — Typography & Layout
   Extends the main site design system for long-form reading.
   ============================================================================= */

/* ── Article List (index) ──────────────────────────────────────────────────── */

.articles-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.article-card {
  background: rgba(12, 12, 20, 0.5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
  color: inherit;
}

.article-card-body {
  padding: 32px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card-tag {
  display: inline-block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--primary-subtle);
  border: 1px solid rgba(255, 107, 53, 0.12);
  width: fit-content;
}

.article-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.article-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  flex: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-dim);
}

.article-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ── Article Page ──────────────────────────────────────────────────────────── */

.article-header {
  padding: 160px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.article-header::before {
  content: '';
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black 20%, transparent 100%);
}

.article-header::after {
  content: '';
  position: absolute; top: -100px; left: 50%; transform: translateX(-50%);
  width: 700px; height: 400px; border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(255, 107, 53, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.article-header .section-label { position: relative; z-index: 1; }

.article-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  letter-spacing: -0.02em;
  max-width: 800px;
  margin: 0 auto 20px;
  position: relative; z-index: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 14px;
  color: var(--text-dim);
  position: relative; z-index: 1;
}

.article-meta-sep { color: var(--border-light); }

/* ── Article Content (prose) ───────────────────────────────────────────────── */

.article-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 120px;
}

.article-content h2 {
  font-size: 24px;
  margin: 56px 0 16px;
  letter-spacing: -0.02em;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.article-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.article-content h3 {
  font-size: 19px;
  margin: 40px 0 12px;
  letter-spacing: -0.01em;
}

.article-content p {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}

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

.article-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(255, 107, 53, 0.3);
  transition: text-decoration-color var(--transition);
}

.article-content a:hover {
  text-decoration-color: var(--primary);
}

.article-content ul,
.article-content ol {
  margin: 0 0 24px 24px;
  color: var(--text-muted);
}

.article-content li {
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 8px;
}

.article-content li strong {
  color: var(--text);
}

/* Code blocks */
.article-content pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 24px 0 28px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.7;
}

.article-content code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9em;
}

.article-content p code,
.article-content li code {
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.85em;
  color: var(--primary-light);
  border: 1px solid var(--border);
}

/* Blockquotes */
.article-content blockquote {
  border-left: 3px solid var(--primary);
  margin: 24px 0;
  padding: 16px 24px;
  background: var(--primary-subtle);
  border-radius: 0 12px 12px 0;
}

.article-content blockquote p {
  color: var(--text);
  margin-bottom: 0;
  font-style: italic;
}

/* Tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}

.article-content th {
  text-align: left;
  padding: 12px 16px;
  background: var(--bg-surface);
  color: var(--text);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 2px solid var(--border);
}

.article-content td {
  padding: 12px 16px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.article-content tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* Info/tip boxes */
.article-tip {
  display: flex;
  gap: 14px;
  padding: 20px 24px;
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid rgba(59, 130, 246, 0.12);
  border-radius: 12px;
  margin: 24px 0;
}

.article-tip-icon {
  flex-shrink: 0;
  color: var(--blue);
  font-size: 18px;
  margin-top: 2px;
}

.article-tip p {
  margin-bottom: 0;
  font-size: 14px;
  color: var(--text-muted);
}

.article-warning {
  display: flex;
  gap: 14px;
  padding: 20px 24px;
  background: rgba(255, 107, 53, 0.06);
  border: 1px solid rgba(255, 107, 53, 0.12);
  border-radius: 12px;
  margin: 24px 0;
}

.article-warning-icon {
  flex-shrink: 0;
  color: var(--primary);
  font-size: 18px;
  margin-top: 2px;
}

.article-warning p {
  margin-bottom: 0;
  font-size: 14px;
}

/* ── Related Articles ──────────────────────────────────────────────────────── */

.related-articles {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 80px;
}

.related-articles h2 {
  font-size: 20px;
  margin-bottom: 24px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-card {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  transition: all var(--transition);
}

.related-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.related-card h4 {
  font-size: 14px;
  margin-bottom: 6px;
  color: var(--text);
}

.related-card p {
  font-size: 12px;
  color: var(--text-dim);
  line-height: 1.5;
}

/* ── Responsive ────────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .articles-grid { grid-template-columns: 1fr; }
  .article-header { padding: 130px 0 40px; }
  .article-header h1 { font-size: clamp(1.5rem, 6vw, 2.2rem); }
  .article-meta { flex-direction: column; gap: 8px; }
  .article-content { padding: 0 20px 80px; }
  .article-content h2 { font-size: 20px; }
  .article-content pre { padding: 16px; font-size: 12px; }
  .related-grid { grid-template-columns: 1fr; }
}