:root {
  --nb-blog-bg: #050713;
  --nb-blog-bg-soft: #0a0f22;
  --nb-blog-surface: rgba(255, 255, 255, 0.04);
  --nb-blog-surface-hover: rgba(255, 255, 255, 0.08);
  --nb-blog-border: rgba(255, 255, 255, 0.12);
  --nb-blog-border-strong: rgba(255, 255, 255, 0.24);
  --nb-blog-text: #f4f4f7;
  --nb-blog-text-soft: rgba(244, 244, 247, 0.78);
  --nb-blog-text-muted: rgba(244, 244, 247, 0.55);
  --nb-blog-accent: #b29bff;
  --nb-blog-accent-soft: rgba(178, 155, 255, 0.16);
  --nb-blog-link: #b29bff;
  --nb-blog-link-hover: #d4c4ff;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--nb-blog-bg);
  color: var(--nb-blog-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
  min-height: 100vh;
  background-image:
    radial-gradient(circle at 12% -10%, rgba(125, 162, 255, 0.18), transparent 38%),
    radial-gradient(circle at 88% 110%, rgba(139, 92, 246, 0.16), transparent 42%);
  background-attachment: fixed;
}

a {
  color: var(--nb-blog-link);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: var(--nb-blog-link-hover);
}

.nb-blog-header {
  max-width: 880px;
  margin: 0 auto;
  padding: 28px 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nb-blog-brand {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--nb-blog-text);
}
.nb-blog-brand:hover {
  color: var(--nb-blog-accent);
}
.nb-blog-nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
  font-weight: 600;
}
.nb-blog-nav a {
  color: var(--nb-blog-text-soft);
}
.nb-blog-nav a[aria-current='page'] {
  color: var(--nb-blog-text);
}
.nb-blog-nav a:hover {
  color: var(--nb-blog-accent);
}

/* Index */
.nb-blog-index {
  max-width: 880px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.nb-blog-hero h1 {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.nb-blog-hero p {
  font-size: 18px;
  color: var(--nb-blog-text-soft);
  max-width: 560px;
  margin: 0 0 32px;
}

.nb-blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 36px;
}
.nb-blog-filters button {
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--nb-blog-border);
  background: var(--nb-blog-surface);
  color: var(--nb-blog-text-soft);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.nb-blog-filters button:hover {
  background: var(--nb-blog-surface-hover);
  border-color: var(--nb-blog-border-strong);
  color: var(--nb-blog-text);
}
.nb-blog-filters button.is-active {
  background: var(--nb-blog-accent-soft);
  border-color: var(--nb-blog-accent);
  color: var(--nb-blog-accent);
}

.nb-blog-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
}
.nb-blog-card {
  background: var(--nb-blog-surface);
  border: 1px solid var(--nb-blog-border);
  border-radius: 16px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}
.nb-blog-card:hover {
  background: var(--nb-blog-surface-hover);
  border-color: var(--nb-blog-border-strong);
  transform: translateY(-2px);
}
.nb-blog-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--nb-blog-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}
.nb-blog-card h2 {
  font-size: 20px;
  line-height: 1.25;
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.nb-blog-card h2 a {
  color: var(--nb-blog-text);
}
.nb-blog-card h2 a:hover {
  color: var(--nb-blog-accent);
}
.nb-blog-card p {
  margin: 0;
  font-size: 15px;
  color: var(--nb-blog-text-soft);
  flex-grow: 1;
}
.nb-blog-card-cta {
  font-size: 14px;
  font-weight: 600;
  color: var(--nb-blog-accent);
  margin-top: 6px;
}

/* Article */
.nb-blog-article {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}
.nb-blog-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--nb-blog-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 32px;
}
.nb-blog-meta a {
  color: var(--nb-blog-text-muted);
}
.nb-blog-meta a:hover {
  color: var(--nb-blog-accent);
}

.nb-blog-article article h1 {
  font-size: clamp(32px, 4.5vw, 44px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 32px;
}
.nb-blog-article article h2 {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 48px 0 16px;
}
.nb-blog-article article h3 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  margin: 32px 0 12px;
}
.nb-blog-article article p {
  font-size: 17px;
  line-height: 1.7;
  color: var(--nb-blog-text-soft);
  margin: 0 0 20px;
}
.nb-blog-article article strong {
  color: var(--nb-blog-text);
  font-weight: 600;
}
.nb-blog-article article a {
  color: var(--nb-blog-link);
  text-decoration: underline;
  text-decoration-color: rgba(178, 155, 255, 0.36);
  text-underline-offset: 3px;
}
.nb-blog-article article a:hover {
  text-decoration-color: var(--nb-blog-link-hover);
}
.nb-blog-article article hr {
  border: 0;
  border-top: 1px solid var(--nb-blog-border);
  margin: 40px 0;
}
.nb-blog-article article em {
  color: var(--nb-blog-text);
  font-style: italic;
}

.nb-blog-byline {
  margin: 48px 0 0;
  font-size: 14px;
  color: var(--nb-blog-text-muted);
}
.nb-blog-byline strong {
  color: var(--nb-blog-text-soft);
}

.nb-blog-related {
  margin-top: 48px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid var(--nb-blog-border);
  font-size: 14px;
  font-weight: 600;
}

.nb-blog-footer {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 24px 56px;
  border-top: 1px solid var(--nb-blog-border);
  font-size: 13px;
  color: var(--nb-blog-text-muted);
  text-align: center;
}
.nb-blog-footer a {
  color: var(--nb-blog-text-muted);
}
.nb-blog-footer a:hover {
  color: var(--nb-blog-accent);
}

@media (max-width: 540px) {
  .nb-blog-header {
    padding-top: 20px;
  }
  .nb-blog-index,
  .nb-blog-article {
    padding-top: 36px;
    padding-bottom: 56px;
  }
  .nb-blog-cards {
    grid-template-columns: 1fr;
  }
}