:root {
  --vt-bg: #0a0e17;
  --vt-bg-alt: #111827;
  --vt-card: #151c2c;
  --vt-border: #1f2937;
  --vt-text: #e5e7eb;
  --vt-muted: #9ca3af;
  --vt-accent: #3b82f6;
  --vt-accent-hover: #60a5fa;
  --vt-gradient: linear-gradient(135deg, #1d4ed8 0%, #7c3aed 100%);
  --vt-radius: 12px;
  --vt-font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

body.vt-body {
  margin: 0;
  font-family: var(--vt-font);
  background: var(--vt-bg);
  color: var(--vt-text);
  line-height: 1.65;
  font-size: 1.05rem;
}

.vt-skip {
  position: absolute;
  left: -9999px;
  top: 0;
}
.vt-skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 9999;
  background: var(--vt-accent);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 6px;
}

.vt-container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.vt-narrow { width: min(760px, 92vw); }
.vt-center { text-align: center; }

.vt-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--vt-border);
}

.vt-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0;
  gap: 1rem;
}

.vt-logo img { display: block; height: 36px; width: auto; }

.vt-nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.vt-nav a {
  color: var(--vt-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}
.vt-nav a:hover { color: #fff; }

.vt-main { min-height: 60vh; }

.vt-hero {
  padding: 4rem 0 3rem;
  background: radial-gradient(ellipse at 30% 0%, rgba(59, 130, 246, 0.15), transparent 55%),
              radial-gradient(ellipse at 80% 20%, rgba(124, 58, 237, 0.12), transparent 50%);
}

.vt-eyebrow {
  color: var(--vt-accent-hover);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  margin: 0 0 0.75rem;
}

.vt-hero-title {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  max-width: 18ch;
}

.vt-hero-lead {
  color: var(--vt-muted);
  font-size: 1.1rem;
  max-width: 52ch;
  margin: 0;
}

.vt-section { padding: 3rem 0; }
.vt-section-alt { background: var(--vt-bg-alt); }

.vt-section-header { margin-bottom: 2rem; }
.vt-section-header h2 { margin: 0 0 0.35rem; font-size: 1.75rem; }
.vt-section-header p { margin: 0; color: var(--vt-muted); }

.vt-featured {
  background: var(--vt-card);
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius);
  padding: 2rem;
  border-left: 4px solid var(--vt-accent);
}

.vt-featured h2 { margin: 0.5rem 0 1rem; font-size: 1.6rem; }
.vt-featured h2 a { color: #fff; text-decoration: none; }
.vt-featured h2 a:hover { color: var(--vt-accent-hover); }

.vt-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.vt-grid-3 { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }

.vt-card {
  background: var(--vt-card);
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: border-color 0.2s, transform 0.2s;
}
.vt-card:hover { border-color: #374151; transform: translateY(-2px); }

.vt-card h2, .vt-card h3 { margin: 0; font-size: 1.15rem; line-height: 1.35; }
.vt-card h2 a, .vt-card h3 a { color: #fff; text-decoration: none; }
.vt-card h2 a:hover, .vt-card h3 a:hover { color: var(--vt-accent-hover); }
.vt-card p { margin: 0; color: var(--vt-muted); font-size: 0.95rem; flex-grow: 1; }

.vt-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--vt-accent-hover);
  background: rgba(59, 130, 246, 0.12);
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  width: fit-content;
}

.vt-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.82rem;
  color: var(--vt-muted);
}

.vt-btn {
  display: inline-block;
  background: var(--vt-gradient);
  color: #fff !important;
  text-decoration: none;
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  width: fit-content;
}
.vt-btn:hover { opacity: 0.92; }

.vt-link {
  color: var(--vt-accent-hover);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
}
.vt-link:hover { text-decoration: underline; }

.vt-categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.vt-cat-pill {
  display: block;
  background: var(--vt-card);
  border: 1px solid var(--vt-border);
  border-radius: var(--vt-radius);
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s;
}
.vt-cat-pill:hover { border-color: var(--vt-accent); }
.vt-cat-pill strong { display: block; color: #fff; margin-bottom: 0.35rem; }
.vt-cat-pill span { font-size: 0.88rem; color: var(--vt-muted); }

.vt-article { padding: 2rem 0 3rem; }
.vt-article-wrap { max-width: 760px; }

.vt-breadcrumb {
  font-size: 0.85rem;
  color: var(--vt-muted);
  margin-bottom: 1.5rem;
}
.vt-breadcrumb a { color: var(--vt-accent-hover); text-decoration: none; }

.vt-article-header { margin-bottom: 2rem; }
.vt-article-header h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.25rem);
  line-height: 1.25;
  margin: 0.75rem 0 1rem;
}

.vt-prose h2 { margin: 2rem 0 0.75rem; font-size: 1.35rem; color: #fff; }
.vt-prose h3 { margin: 1.5rem 0 0.5rem; font-size: 1.1rem; }
.vt-prose p { margin: 0 0 1rem; }
.vt-prose ul, .vt-prose ol { margin: 0 0 1rem; padding-left: 1.4rem; }
.vt-prose li { margin-bottom: 0.35rem; }
.vt-prose a { color: var(--vt-accent-hover); }
.vt-prose strong { color: #fff; }

.vt-tags { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.vt-tag {
  font-size: 0.8rem;
  background: var(--vt-bg-alt);
  border: 1px solid var(--vt-border);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  color: var(--vt-muted);
}

.vt-related-title { margin: 0 0 1.5rem; }

.vt-contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}
@media (max-width: 700px) {
  .vt-contact-grid { grid-template-columns: 1fr; }
  .vt-nav { display: none; }
}

.vt-form label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--vt-muted);
}
.vt-form input,
.vt-form textarea {
  width: 100%;
  background: var(--vt-bg-alt);
  border: 1px solid var(--vt-border);
  border-radius: 8px;
  color: #fff;
  padding: 0.65rem 0.85rem;
  margin-bottom: 1rem;
  font-family: inherit;
  font-size: 1rem;
}
.vt-form input:focus,
.vt-form textarea:focus {
  outline: none;
  border-color: var(--vt-accent);
}

.vt-alert {
  padding: 0.85rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}
.vt-alert-success { background: rgba(34, 197, 94, 0.12); border: 1px solid #166534; }
.vt-alert-error { background: rgba(239, 68, 68, 0.12); border: 1px solid #991b1b; }

.vt-footer {
  border-top: 1px solid var(--vt-border);
  background: var(--vt-bg-alt);
  margin-top: 3rem;
  padding: 3rem 0 1.5rem;
}

.vt-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
@media (max-width: 768px) {
  .vt-footer-grid { grid-template-columns: 1fr; }
}

.vt-footer-brand { font-size: 1.1rem; color: #fff; }
.vt-footer-title { font-size: 0.9rem; color: #fff; margin: 0 0 0.75rem; }
.vt-footer-text { color: var(--vt-muted); font-size: 0.9rem; margin: 0.5rem 0 0; }
.vt-footer-text a { color: var(--vt-accent-hover); }
.vt-footer-links { list-style: none; padding: 0; margin: 0; }
.vt-footer-links li { margin-bottom: 0.4rem; }
.vt-footer-links a { color: var(--vt-muted); text-decoration: none; font-size: 0.9rem; }
.vt-footer-links a:hover { color: #fff; }

.vt-footer-bottom {
  border-top: 1px solid var(--vt-border);
  padding-top: 1rem;
  font-size: 0.82rem;
  color: var(--vt-muted);
}