:root {
  --bg: #020617;
  --bg-elevated: #020617;
  --text: #e5e7eb;
  --muted: #9ca3af;

  --gold: #facc15;
  --royal-blue: #3b82f6;
  --emerald: #10b981;
  --forest: #22c55e;
  --purple: #a855f7;
  --gray: #6b7280;

  --radius-lg: 18px;
  --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.55);
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #0f172a 0, #020617 55%, #000 100%);
  color: var(--text);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 6vw;
  background: rgba(2, 6, 23, 0.9);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
}

.logo {
  display: inline-block;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.95rem;
}

/* New */
.logo-container {
  display: flex;
  flex-direction: column;
  align-items: center; /* or center if you prefer */
}

.version-tag {
  color: var(--muted);       /* light gray from your palette */
  font-size: 0.7rem;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.nav-links a {
  color: var(--muted);
  transition: color 0.2s ease, transform 0.2s ease;
}

.nav-links a:hover {
  color: #e5e7eb;
  transform: translateY(-1px);
}

.hero {
  padding: 5rem 6vw 3rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  margin-bottom: 0.75rem;
}

.hero p {
  max-width: 540px;
  margin: 0 auto 1.75rem;
  color: var(--muted);
}

.btn-primary {
  border: none;
  border-radius: 999px;
  padding: 0.85rem 2.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  background: linear-gradient(135deg, #22c55e, #3b82f6);
  color: #020617;
  box-shadow: 0 14px 32px rgba(37, 99, 235, 0.5);
  transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 40px rgba(37, 99, 235, 0.7);
  filter: brightness(1.08);
}

.categories {
  padding: 1rem 6vw 4rem;
}

.categories h2 {
  text-align: center;
  margin-bottom: 2rem;
  font-size: 1.5rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.5rem;
}

.category-card {
  background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.06), rgba(15, 23, 42, 0.96));
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.4rem 1.25rem;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.3);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.category-card::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.category-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

.category-card p {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.sub-list {
  list-style: disc;
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.85rem;
  color: #cbd5f5;
}

/* Category-specific accents */
.cat-jewish {
  border-color: rgba(250, 204, 21, 0.7);
}
.cat-jewish::after {
  background: radial-gradient(circle at top right, rgba(250, 204, 21, 0.18), transparent 55%);
}

.cat-productivity {
  border-color: rgba(59, 130, 246, 0.7);
}
.cat-productivity::after {
  background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.2), transparent 55%);
}

.cat-education {
  border-color: rgba(16, 185, 129, 0.7);
}
.cat-education::after {
  background: radial-gradient(circle at top right, rgba(16, 185, 129, 0.2), transparent 55%);
}

.cat-media {
  border-color: rgba(245, 158, 11, 0.85); /* warm golden accent */
}
.cat-media::after {
  background: radial-gradient(circle at top right, rgba(245, 158, 11, 0.25), transparent 55%);
}


.cat-finance {
  border-color: rgba(34, 197, 94, 0.8);
}
.cat-finance::after {
  background: radial-gradient(circle at top right, rgba(34, 197, 94, 0.24), transparent 55%);
}

.cat-experimental {
  border-color: rgba(168, 85, 247, 0.8);
}
.cat-experimental::after {
  background: radial-gradient(circle at top right, rgba(168, 85, 247, 0.26), transparent 55%);
}

.cat-misc {
  border-color: rgba(107, 114, 128, 0.8);
}
.cat-misc::after {
  background: radial-gradient(circle at top right, rgba(107, 114, 128, 0.24), transparent 55%);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 46px rgba(0, 0, 0, 0.7);
}
.category-card:hover::after {
  opacity: 1;
}

.site-footer {
  padding: 1.5rem 6vw 2rem;
  border-top: 1px solid rgba(148, 163, 184, 0.25);
  text-align: center;
  font-size: 0.85rem;
  color: var(--muted);
}
.site-footer a {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .site-header {
    padding-inline: 4vw;
  }
  .hero {
    padding-inline: 4vw;
  }
  .categories {
    padding-inline: 4vw;
  }
}