:root {
  --ink: #0f172a;
  --muted: #4b5563;
  --accent: #22c55e;
  --accent-2: #0ea5e9;
  --bg: #0b1220;
  --panel: rgba(17, 24, 39, 0.82);
  --border: rgba(255, 255, 255, 0.08);
}

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

body {
  margin: 0; padding: 0;
  font-family: 'Inter', 'Segoe UI', -apple-system, system-ui, sans-serif;
  background: radial-gradient(circle at 20% 20%, rgba(34,197,94,0.08), transparent 25%),
    radial-gradient(circle at 80% 10%, rgba(14,165,233,0.08), transparent 25%),
    linear-gradient(180deg, #0b1220 0%, #0a0f1a 100%);
  color: #f8fafc;
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.blog-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid var(--border);
}
.blog-header__inner {
  max-width: 860px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}
.blog-header .brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; color: #fff; letter-spacing: 0.4px; font-size: 15px;
}
.blog-header .brand span {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.blog-header nav { display: flex; gap: 16px; font-size: 14px; }
.blog-header nav a { color: #94a3b8; }
.blog-header nav a:hover { color: #fff; }

/* Breadcrumb */
.breadcrumb {
  max-width: 860px; margin: 16px auto 0; padding: 0 20px;
  font-size: 13px; color: #64748b;
}
.breadcrumb a { color: #94a3b8; }
.breadcrumb span { margin: 0 6px; }

/* Article */
.article-container {
  max-width: 860px; margin: 0 auto; padding: 24px 20px 48px;
}
.article-hero { margin-bottom: 32px; }
.article-hero h1 {
  font-size: 34px; letter-spacing: -0.5px;
  margin: 0 0 12px; line-height: 1.25;
}
.article-meta {
  display: flex; gap: 16px; flex-wrap: wrap;
  font-size: 13px; color: #64748b; margin-bottom: 16px;
}
.article-meta span { display: flex; align-items: center; gap: 4px; }
.article-hero .lead {
  font-size: 18px; color: #cbd5e1; line-height: 1.6; margin: 0;
}
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.tag {
  padding: 4px 10px; border-radius: 999px; font-size: 12px;
  background: rgba(34,197,94,0.10); color: #bbf7d0; border: 1px solid rgba(34,197,94,0.25);
}
.tag.blue {
  background: rgba(14,165,233,0.10); color: #bae6fd; border-color: rgba(14,165,233,0.25);
}

/* Content */
.article-body h2 {
  font-size: 24px; margin: 36px 0 12px; letter-spacing: -0.3px;
  padding-bottom: 8px; border-bottom: 1px solid var(--border);
}
.article-body h3 {
  font-size: 19px; margin: 28px 0 10px; color: #e2e8f0;
}
.article-body p {
  margin: 12px 0; color: #e2e8f0;
}
.article-body ul, .article-body ol {
  margin: 12px 0 12px 20px; color: #dbeafe; padding-left: 14px;
}
.article-body li { margin-bottom: 8px; }
.article-body strong { color: #fff; }

/* Tip box */
.tip-box {
  background: rgba(34,197,94,0.08); border: 1px solid rgba(34,197,94,0.25);
  border-radius: 12px; padding: 16px 20px; margin: 20px 0;
}
.tip-box h4 { margin: 0 0 6px; color: #bbf7d0; font-size: 15px; }
.tip-box p { margin: 4px 0; color: #d1fae5; font-size: 15px; }

/* Info box */
.info-box {
  background: rgba(14,165,233,0.08); border: 1px solid rgba(14,165,233,0.25);
  border-radius: 12px; padding: 16px 20px; margin: 20px 0;
}
.info-box h4 { margin: 0 0 6px; color: #bae6fd; font-size: 15px; }
.info-box p { margin: 4px 0; color: #e0f2fe; font-size: 15px; }

/* Stats grid */
.stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px; margin: 20px 0;
}
.stat-card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 16px; text-align: center;
}
.stat-card .stat-number {
  font-size: 28px; font-weight: 700; display: block;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-card .stat-label { font-size: 13px; color: #94a3b8; }

/* CTA box */
.cta-box {
  background: linear-gradient(135deg, rgba(34,197,94,0.12), rgba(14,165,233,0.12));
  border: 1px solid rgba(34,197,94,0.3);
  border-radius: 14px; padding: 24px; margin: 32px 0; text-align: center;
}
.cta-box h3 { margin: 0 0 8px; font-size: 20px; }
.cta-box p { margin: 0 0 16px; color: #cbd5e1; }
.cta-btn {
  display: inline-block; padding: 12px 28px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #0b1220; font-weight: 700; border-radius: 999px;
  font-size: 15px; text-decoration: none; border: none; cursor: pointer;
}
.cta-btn:hover { opacity: 0.9; text-decoration: none; }

/* Related posts */
.related-posts { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); }
.related-posts h3 { margin: 0 0 16px; font-size: 20px; }
.related-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px;
}
.related-card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 12px; padding: 18px; transition: border-color 0.2s;
}
.related-card:hover { border-color: rgba(34,197,94,0.4); }
.related-card h4 { margin: 0 0 6px; font-size: 16px; }
.related-card h4 a { color: #f1f5f9; }
.related-card p { margin: 0; font-size: 13px; color: #94a3b8; }

/* Blog index cards */
.blog-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px;
  margin: 24px 0;
}
.blog-card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 14px; padding: 24px; transition: border-color 0.2s, transform 0.2s;
}
.blog-card:hover { border-color: rgba(34,197,94,0.4); transform: translateY(-2px); }
.blog-card h2 { font-size: 20px; margin: 0 0 8px; }
.blog-card h2 a { color: #f1f5f9; }
.blog-card .excerpt { color: #94a3b8; font-size: 15px; margin: 0 0 12px; }
.blog-card .card-meta { font-size: 12px; color: #64748b; display: flex; gap: 12px; }

/* Footer */
.blog-footer {
  border-top: 1px solid var(--border);
  padding: 18px 20px 32px;
  max-width: 860px; margin: 0 auto;
  color: #94a3b8; font-size: 14px;
}
.blog-footer a { color: #94a3b8; }
.blog-footer__links { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; }

/* Table */
.article-body table {
  width: 100%; border-collapse: collapse; margin: 16px 0;
  font-size: 15px;
}
.article-body th, .article-body td {
  padding: 10px 14px; text-align: left;
  border-bottom: 1px solid var(--border);
}
.article-body th { color: #94a3b8; font-size: 13px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.article-body td { color: #e2e8f0; }

@media (max-width: 640px) {
  .article-hero h1 { font-size: 26px; }
  .article-body h2 { font-size: 20px; }
  .blog-header nav { display: none; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}