:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-soft: #f5f3ff;
  --green: #059669;
  --radius: 14px;
  --max: 1120px;
  --article: 720px;
}

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

body {
  font-family: "DM Sans", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.blog-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.blog-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.blog-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}
.blog-brand:hover { text-decoration: none; }
.blog-brand img { width: 28px; height: 28px; border-radius: 8px; }
.blog-brand span { color: var(--accent); }

.blog-header__actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.blog-lang {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  font-size: 0.78rem;
  font-weight: 600;
}
.blog-lang a {
  padding: 0.35rem 0.7rem;
  color: var(--text-muted);
  text-decoration: none;
}
.blog-lang a.is-active {
  background: var(--accent-soft);
  color: var(--accent);
}
.blog-lang a:hover { text-decoration: none; background: #faf5ff; }

.blog-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  white-space: nowrap;
}
.blog-btn--primary {
  background: linear-gradient(135deg, #7c3aed, #5b21b6);
  color: #fff;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.25);
}
.blog-btn--primary:hover {
  text-decoration: none;
  filter: brightness(1.05);
}
.blog-btn--ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.blog-btn--ghost:hover { text-decoration: none; background: #f1f5f9; }

.blog-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 1.5rem;
}

.blog-breadcrumb {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.blog-breadcrumb a { color: var(--text-muted); font-weight: 500; }
.blog-breadcrumb a:hover { color: var(--accent); }

.blog-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
  margin-bottom: 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.blog-tag {
  display: inline-block;
  background: var(--accent-soft);
  color: #5b21b6;
  font-weight: 700;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

.blog-hero h1 {
  font-size: clamp(1.75rem, 4.5vw, 2.35rem);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
  max-width: 820px;
}

.blog-lead {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 680px;
  line-height: 1.65;
}

.blog-layout {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 3.5rem;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .blog-layout { grid-template-columns: 1fr; }
  .blog-toc { display: none; }
}

.blog-toc {
  position: sticky;
  top: 5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1rem;
}
.blog-toc h2 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}
.blog-toc ol {
  list-style: none;
  font-size: 0.84rem;
}
.blog-toc li { margin-bottom: 0.45rem; }
.blog-toc a {
  color: var(--text-muted);
  font-weight: 500;
  line-height: 1.4;
  display: block;
}
.blog-toc a:hover { color: var(--accent); text-decoration: none; }

.blog-article {
  max-width: var(--article);
}

.blog-article h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2.25rem 0 0.75rem;
  letter-spacing: -0.01em;
  scroll-margin-top: 5rem;
}

.blog-article h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
}

.blog-article p {
  margin-bottom: 1rem;
  color: #334155;
}

.blog-article ul,
.blog-article ol {
  margin: 0 0 1rem 1.25rem;
  color: #334155;
}
.blog-article li { margin-bottom: 0.4rem; }

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

.blog-callout {
  background: var(--accent-soft);
  border: 1px solid #ddd6fe;
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  margin: 1.5rem 0;
}
.blog-callout--warn {
  background: #fffbeb;
  border-color: #fde68a;
}
.blog-callout h3 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  color: #5b21b6;
}
.blog-callout--warn h3 { color: #92400e; }
.blog-callout p:last-child { margin-bottom: 0; }

.blog-table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.blog-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.blog-table th,
.blog-table td {
  padding: 0.75rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.blog-table th {
  background: #f8fafc;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.blog-table tr:last-child td { border-bottom: none; }
.blog-table .yes { color: var(--green); font-weight: 700; }
.blog-table .partial { color: #b45309; font-weight: 600; }

.blog-steps {
  list-style: none;
  margin: 0 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.blog-step {
  display: flex;
  gap: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}
.blog-step__num {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.blog-step h3 { margin: 0 0 0.25rem; font-size: 0.95rem; }
.blog-step p { margin: 0; font-size: 0.9rem; color: var(--text-muted); }

.blog-faq { margin-top: 2rem; }
.blog-faq-item {
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 0.6rem;
  background: var(--surface);
  overflow: hidden;
}
.blog-faq-item summary {
  padding: 0.95rem 1.1rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.92rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}
.blog-faq-item summary::-webkit-details-marker { display: none; }
.blog-faq-item summary::after {
  content: "⌄";
  color: var(--accent);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.blog-faq-item[open] summary::after { transform: rotate(180deg); }
.blog-faq-item .answer {
  padding: 0 1.1rem 1rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.blog-cta {
  margin-top: 2.5rem;
  background: linear-gradient(135deg, #7c3aed, #5b21b6);
  border-radius: 18px;
  padding: 2rem 1.75rem;
  text-align: center;
  color: #fff;
}
.blog-cta h2 {
  color: #fff;
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
}
.blog-cta p {
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}
.blog-cta .blog-btn--primary {
  background: #fff;
  color: var(--accent);
  box-shadow: none;
}
.blog-cta .blog-btn--primary:hover { background: #f5f3ff; }

.blog-related {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-muted);
}
.blog-related ul { list-style: none; margin: 0.5rem 0 0; }
.blog-related li { margin-bottom: 0.35rem; }

.blog-footer {
  border-top: 1px solid var(--border);
  background: #0f0a1a;
  color: #94a3b8;
  padding: 2rem 1.25rem;
  font-size: 0.85rem;
}
.blog-footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}
.blog-footer a { color: #c4b5fd; }
.blog-footer nav { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Blog index */
.blog-index-hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 1rem;
}
.blog-index-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2rem);
  margin-bottom: 0.5rem;
}
.blog-index-grid {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}
.blog-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.blog-card:hover {
  border-color: #c4b5fd;
  box-shadow: 0 8px 24px rgba(124, 58, 237, 0.08);
  text-decoration: none;
}
.blog-card h2 {
  font-size: 1.1rem;
  color: var(--text);
  line-height: 1.35;
}
.blog-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
  flex: 1;
}
.blog-card__link {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--accent);
}