:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --secondary: #ec4899;
  --accent: #f59e0b;
  --bg: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --font: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: rgba(30, 41, 59, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--card-border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #6366f1, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
}

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

.nav-links a:hover, .nav-links a.active {
  color: #fff;
}

.hero {
  padding: 4rem 1.5rem;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(99, 102, 241, 0.25), transparent 70%);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 2rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  flex: 1;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  padding: 1.5rem;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 12px 24px -10px rgba(99, 102, 241, 0.3);
}

.card-badge {
  display: inline-block;
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 9999px;
  background: rgba(99, 102, 241, 0.15);
  color: #818cf8;
  margin-bottom: 0.75rem;
  align-self: flex-start;
}

.card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  flex: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: 0.5rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  font-size: 0.95rem;
}

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

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

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #ea580c);
  color: #fff;
}

.widget-box {
  background: linear-gradient(145deg, #1e293b, #0f172a);
  border: 1px solid var(--card-border);
  border-radius: 1.25rem;
  padding: 2rem;
  margin-bottom: 3rem;
  text-align: center;
}

.fact-display {
  font-size: 1.35rem;
  font-weight: 500;
  color: #f1f5f9;
  margin: 1.5rem 0;
  padding: 1.5rem;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 0.75rem;
  border-left: 4px solid var(--accent);
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-bar {
  display: flex;
  max-width: 600px;
  margin: 0 auto 2rem;
  gap: 0.5rem;
}

.search-input {
  flex: 1;
  padding: 0.85rem 1.25rem;
  border-radius: 0.5rem;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: #fff;
  font-size: 1rem;
}

.search-input:focus {
  outline: none;
  border-color: var(--primary);
}

.quiz-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.85rem 1.25rem;
  margin-bottom: 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.5rem;
  color: #fff;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 1rem;
}

.quiz-option:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.quiz-option.correct {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
  color: #34d399;
}

.quiz-option.wrong {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #f87171;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.75rem;
  margin-bottom: 1rem;
  padding: 1.25rem;
}

.faq-item h4 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: #818cf8;
}

.faq-item p {
  color: var(--text-muted);
}

footer {
  background: #090d16;
  border-top: 1px solid var(--card-border);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer a {
  color: #818cf8;
  text-decoration: none;
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .grid { grid-template-columns: 1fr; }
}