:root {
  --bg: #0b1220;
  --bg-soft: #111827;
  --card: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --accent: #14b8a6;
  --border: #334155;
}

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

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% -5%, #1b2b49 0%, rgba(27, 43, 73, 0) 36%),
    radial-gradient(circle at 90% 0%, #1a304f 0%, rgba(26, 48, 79, 0) 30%),
    var(--bg);
  line-height: 1.65;
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 100;
  padding: 0.5rem 1rem;
  background: var(--primary);
  color: #fff;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.blog-wrap {
  width: min(720px, 92%);
  margin: 0 auto;
  padding: 0 0 3rem;
}

.blog-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10, 15, 31, 0.94);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
}

.blog-header .blog-wrap {
  padding: 0.85rem 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.65rem 1rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border: 0;
  cursor: pointer;
}

.btn-back {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-back:hover {
  border-color: var(--primary);
  color: #fff;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.blog-meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 0.5rem;
}

.blog-article {
  padding-top: 1.25rem;
}

.blog-article h1 {
  font-size: clamp(1.65rem, 4vw, 2.15rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  color: #fff;
}

.lead {
  font-size: 1.08rem;
  color: var(--text);
  margin: 0 0 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.blog-article h2 {
  font-size: 1.2rem;
  margin: 2rem 0 0.75rem;
  color: #fff;
  scroll-margin-top: 4rem;
}

.blog-article h3 {
  font-size: 1.05rem;
  margin: 1.35rem 0 0.5rem;
  color: var(--text);
}

.blog-article p {
  margin: 0 0 1rem;
}

.blog-article ul,
.blog-article ol {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
}

.blog-article li {
  margin-bottom: 0.4rem;
}

.blog-article a {
  color: var(--primary);
  text-decoration: none;
}

.blog-article a:hover {
  text-decoration: underline;
}

.blog-table-wrap {
  overflow-x: auto;
  margin: 1rem 0 1.25rem;
}

.blog-article table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.blog-article th,
.blog-article td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.65rem;
  text-align: left;
}

.blog-article th {
  background: var(--bg-soft);
  color: #fff;
}

.note-box {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

.blog-cta {
  margin-top: 2.5rem;
  padding: 1.25rem 1.35rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.blog-cta p {
  margin: 0 0 0.85rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.blog-cta .cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.toc {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.15rem;
  margin: 0 0 1.75rem;
}

.toc strong {
  display: block;
  margin-bottom: 0.5rem;
  color: #fff;
  font-size: 0.9rem;
}

.toc ul {
  margin: 0;
  padding-left: 1.1rem;
}

.toc a {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.92rem;
}

.toc a:hover {
  text-decoration: underline;
}