:root {
  --primary-50: #f0f0ff;
  --primary-100: #e0e0ff;
  --primary-200: #c7c7fe;
  --primary-300: #a5a5fc;
  --primary-400: #8b7cf8;
  --primary-500: #7c5cf2;
  --primary-600: #6d3de6;
  --primary-700: #5e2ecb;
  --primary-800: #4e27a5;
  --primary-900: #3b1f7a;
  --accent-400: #38bdf8;
  --accent-500: #0ea5e9;
  --accent-600: #0284c7;
  --accent-700: #0369a1;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #1f2937; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  background: #fff;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul, ol { padding-left: 1.5rem; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.container-article { max-width: 820px; margin: 0 auto; padding: 0 24px; }

/* ── Navbar (light theme for blog pages) ── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.97); backdrop-filter: blur(8px);
  border-bottom: 1px solid #f3f4f6;
}
.navbar-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.navbar-logo { font-size: 1.25rem; font-weight: 800; color: var(--primary-700); }
.navbar-logo span { color: var(--primary-400); }
.navbar-links { display: flex; align-items: center; gap: 32px; }
.navbar-link { font-size: 0.875rem; font-weight: 500; color: #6b7280; transition: color 0.3s; }
.navbar-link:hover { color: var(--primary-600); }
.navbar-link.active { color: var(--primary-700); font-weight: 600; }
.btn-nav-cta {
  background: var(--primary-600); color: #fff; font-size: 0.875rem; font-weight: 600;
  padding: 8px 20px; border-radius: 8px; transition: background 0.3s;
}
.btn-nav-cta:hover { background: var(--primary-700); }

.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.hamburger-line { display: block; width: 20px; height: 2px; background: #1f2937; transition: all 0.3s; margin: 4px 0; }
.hamburger.open .hamburger-line:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.hamburger.open .hamburger-line:nth-child(2) { opacity: 0; }
.hamburger.open .hamburger-line:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }
.mobile-menu {
  display: none; background: #fff; border-top: 1px solid #e5e7eb;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08); padding: 16px 24px;
}
.mobile-menu.open { display: block; }
.mobile-menu a { display: block; padding: 10px 0; color: #374151; font-weight: 500; font-size: 1rem; }
.mobile-menu .btn-mobile-cta {
  display: block; background: var(--primary-600); color: #fff; text-align: center;
  font-weight: 600; padding: 12px; border-radius: 8px; margin-top: 8px;
}

/* ── Blog hero ── */
.blog-hero {
  background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-800) 40%, var(--accent-700) 100%);
  color: #fff; padding: 64px 0 80px;
}
.blog-hero h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.blog-hero p { font-size: 1.125rem; color: rgba(255,255,255,0.75); max-width: 640px; }

/* ── Breadcrumbs ── */
.breadcrumbs {
  display: flex; gap: 8px; align-items: center;
  font-size: 0.875rem; color: #9ca3af; margin-bottom: 24px;
}
.breadcrumbs a { color: #9ca3af; transition: color 0.3s; }
.breadcrumbs a:hover { color: var(--primary-600); }
.breadcrumbs .sep { color: #d1d5db; }

/* ── Article listing (index) ── */
.blog-list { padding: 64px 0 96px; }
.blog-list-header { margin-bottom: 40px; }
.blog-list-header h2 { font-size: 1.75rem; font-weight: 800; color: #111827; margin-bottom: 8px; }
.blog-list-header p { color: #6b7280; }

.article-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.article-card {
  background: #fff; border: 1px solid #f3f4f6; border-radius: 16px;
  padding: 32px; transition: box-shadow 0.3s, transform 0.3s; display: block;
}
.article-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.08); transform: translateY(-2px); }
.article-tag {
  display: inline-block; background: var(--primary-50); color: var(--primary-700);
  font-size: 0.75rem; font-weight: 600; padding: 4px 12px; border-radius: 100px;
  margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.04em;
}
.article-card h3 { font-size: 1.25rem; font-weight: 700; color: #111827; margin-bottom: 12px; line-height: 1.35; }
.article-card p { color: #6b7280; font-size: 0.9375rem; margin-bottom: 20px; }
.article-meta {
  display: flex; gap: 16px; font-size: 0.8125rem; color: #9ca3af;
}
.article-meta .dot { color: #d1d5db; }

/* ── Article body ── */
.article-body { padding: 64px 0 96px; }
.article-body h1 { font-size: 2.25rem; font-weight: 800; color: #111827; line-height: 1.2; margin-bottom: 16px; }
.article-header-meta {
  display: flex; gap: 16px; align-items: center;
  font-size: 0.875rem; color: #6b7280; margin-bottom: 40px;
  padding-bottom: 24px; border-bottom: 1px solid #f3f4f6;
}
.article-body h2 {
  font-size: 1.75rem; font-weight: 800; color: #111827;
  margin: 56px 0 20px; line-height: 1.3;
}
.article-body h3 {
  font-size: 1.25rem; font-weight: 700; color: #111827;
  margin: 40px 0 16px;
}
.article-body p { color: #374151; margin-bottom: 20px; font-size: 1.0625rem; line-height: 1.75; }
.article-body ul, .article-body ol { margin-bottom: 24px; color: #374151; }
.article-body li { margin-bottom: 10px; font-size: 1.0625rem; line-height: 1.7; }
.article-body strong { color: #111827; font-weight: 700; }
.article-body blockquote {
  border-left: 4px solid var(--primary-500);
  background: var(--primary-50);
  padding: 20px 24px; margin: 32px 0;
  font-style: italic; color: #374151; border-radius: 0 12px 12px 0;
}
.article-body code {
  background: #f3f4f6; color: var(--primary-700);
  padding: 2px 8px; border-radius: 4px; font-size: 0.9em;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}
.article-body pre {
  background: #1f2937; color: #f3f4f6;
  padding: 20px; border-radius: 12px; overflow-x: auto;
  margin: 24px 0; font-size: 0.9rem; line-height: 1.6;
}
.article-body pre code { background: none; color: inherit; padding: 0; }
.article-body hr { border: none; border-top: 1px solid #e5e7eb; margin: 48px 0; }
.article-body a { color: var(--primary-700); font-weight: 500; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.article-body a:hover { color: var(--primary-600); }

.article-body table {
  width: 100%; border-collapse: collapse; margin: 24px 0;
  font-size: 0.9375rem; background: #fff;
  border-radius: 12px; overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.article-body thead { background: var(--primary-50); }
.article-body th {
  text-align: left; padding: 12px 16px;
  font-weight: 700; color: var(--primary-800);
  border-bottom: 2px solid var(--primary-200);
}
.article-body td { padding: 12px 16px; border-bottom: 1px solid #f3f4f6; color: #374151; }
.article-body tbody tr:last-child td { border-bottom: none; }
.article-body tbody tr:hover { background: #f9fafb; }

.callout {
  border: 1px solid #e5e7eb; border-left: 4px solid var(--accent-500);
  background: #f9fafb; padding: 20px 24px; border-radius: 0 12px 12px 0;
  margin: 32px 0;
}
.callout-title { font-weight: 700; color: #111827; margin-bottom: 8px; display: flex; gap: 8px; align-items: center; }
.callout-title::before { content: ""; display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent-500); }
.callout p:last-child { margin-bottom: 0; }

.script-box {
  background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
  border: 1px solid #e5e7eb; border-radius: 12px;
  padding: 24px 28px; margin: 24px 0;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.9375rem; line-height: 1.7; color: #1f2937;
  white-space: pre-wrap;
}

.article-cta {
  margin: 56px 0 24px; padding: 32px;
  background: linear-gradient(135deg, var(--primary-600), var(--accent-600));
  border-radius: 20px; color: #fff; text-align: center;
}
.article-cta h3 { font-size: 1.375rem; font-weight: 800; margin-bottom: 12px; }
.article-cta p { color: rgba(255,255,255,0.85); margin-bottom: 24px; font-size: 1rem; }
.article-cta a.btn {
  display: inline-block; background: #fff; color: var(--primary-700);
  font-weight: 700; padding: 14px 32px; border-radius: 10px;
  font-size: 1rem; transition: background 0.3s;
}
.article-cta a.btn:hover { background: var(--primary-50); }

.related {
  margin-top: 64px; padding-top: 40px; border-top: 1px solid #f3f4f6;
}
.related h3 { font-size: 1.25rem; font-weight: 700; color: #111827; margin-bottom: 24px; }
.related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.related-item {
  display: block; padding: 20px; background: #f9fafb; border-radius: 12px;
  transition: background 0.3s;
}
.related-item:hover { background: var(--primary-50); }
.related-item .tag { font-size: 0.75rem; color: var(--primary-700); font-weight: 600; text-transform: uppercase; }
.related-item .title { display: block; color: #111827; font-weight: 600; margin-top: 6px; font-size: 0.9375rem; line-height: 1.4; }

.faq-block { margin: 48px 0; }
.faq-block h2 { margin-top: 0; }
.faq-item { border-bottom: 1px solid #f3f4f6; padding: 20px 0; }
.faq-item:first-of-type { border-top: 1px solid #f3f4f6; }
.faq-item h4 { font-size: 1.0625rem; font-weight: 700; color: #111827; margin-bottom: 8px; }
.faq-item p { color: #4b5563; margin: 0; font-size: 1rem; }

/* ── Footer ── */
.footer { background: #111827; padding: 40px 0; color: #9ca3af; }
.footer-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.footer-logo { color: #fff; font-weight: 700; font-size: 1rem; }
.footer-logo span { color: var(--primary-400); }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { color: #9ca3af; font-size: 0.875rem; transition: color 0.3s; }
.footer-links a:hover { color: #fff; }
.footer-copy { color: #6b7280; font-size: 0.875rem; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .navbar-links { display: none; }
  .hamburger { display: block; }
  .blog-hero h1 { font-size: 1.75rem; }
  .blog-hero p { font-size: 1rem; }
  .blog-hero { padding: 40px 0 48px; }
  .article-cards { grid-template-columns: 1fr; gap: 20px; }
  .article-body h1 { font-size: 1.625rem; }
  .article-body h2 { font-size: 1.375rem; margin: 36px 0 16px; }
  .article-body h3 { font-size: 1.125rem; }
  .article-body p, .article-body li { font-size: 1rem; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .article-cta { padding: 24px 20px; }
  .article-body table { font-size: 0.875rem; }
  .article-body th, .article-body td { padding: 10px 12px; }
}