:root {
  --bg: #0d0d0d;
  --fg: #e8e8e8;
  --accent: #9d4edd;
  --muted: #666;
  --card: #1a1a1a;
  --border: #333;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}
header { background: #000; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
nav { max-width: 1200px; margin: 0 auto; padding: 1rem; display: flex; justify-content: space-between; align-items: center; }
.logo { font-family: 'Georgia', serif; font-size: 1.5rem; color: var(--accent); font-weight: bold; }
nav ul { display: flex; gap: 1.5rem; list-style: none; }
nav a { color: var(--fg); text-decoration: none; }
nav a:hover { color: var(--accent); }
main { max-width: 1200px; margin: 0 auto; padding: 2rem 1rem; }
.hero { position: relative; margin-bottom: 3rem; }
.hero img { width: 100%; height: 400px; object-fit: cover; filter: brightness(0.4); }
.hero-text { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); text-align: center; width: 90%; }
h1 { font-family: 'Georgia', serif; font-size: 2.5rem; margin-bottom: 1rem; }
h2 { font-family: 'Georgia', serif; font-size: 2rem; margin: 3rem 0 1.5rem; border-bottom: 2px solid var(--accent); padding-bottom: 0.5rem; }
h3 { font-size: 1.5rem; margin: 2rem 0 1rem; color: var(--accent); }
h4 { font-size: 1.2rem; margin-bottom: 0.5rem; }
.listing { background: var(--card); border: 1px solid var(--border); padding: 1.5rem; margin-bottom: 1.5rem; border-radius: 4px; }
.listing p { margin-bottom: 0.5rem; }
.listing strong { color: var(--accent); }
table { width: 100%; border-collapse: collapse; margin: 2rem 0; background: var(--card); }
th, td { border: 1px solid var(--border); padding: 0.75rem; text-align: left; }
th { background: #000; color: var(--accent); }
#calc-app { background: var(--card); padding: 2rem; border-radius: 4px; margin: 2rem 0; }
#calc-app label { display: block; margin-bottom: 1rem; }
#calc-app select, #calc-app button { width: 100%; padding: 0.75rem; background: #000; color: var(--fg); border: 1px solid var(--border); margin-top: 0.5rem; }
#calc-app button { background: var(--accent); color: #000; font-weight: bold; cursor: pointer; margin-top: 1rem; }
#calc-app button:hover { opacity: 0.9; }
#result { margin-top: 1.5rem; padding: 1rem; background: #000; border-left: 3px solid var(--accent); }
footer { background: #000; border-top: 1px solid var(--border); text-align: center; padding: 2rem 1rem; margin-top: 4rem; color: var(--muted); }
footer a { color: var(--accent); }
@media (max-width: 768px) {
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  nav ul { flex-direction: column; gap: 0.5rem; }
  table { font-size: 0.85rem; }
 .hero img { height: 300px; }
}