:root {
  --primary-color: #4F46E5;
  --primary-light: #6366F1;
  --primary-gradient: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
  --gold-gradient: linear-gradient(135deg, #F59E0B 0%, #D97706 100%);
  --bg-color: #F8FAFC;
  --card-bg: #FFFFFF;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --border-color: #E2E8F0;
  --success: #10B981;
  --warning: #F59E0B;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.7;
  padding-bottom: 60px;
  -webkit-font-smoothing: antialiased;
}

header {
  background: var(--primary-gradient);
  color: white;
  padding: 52px 24px 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 60%);
  animation: headerPulse 6s ease-in-out infinite;
}

@keyframes headerPulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 1; }
}

header h1 {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  margin-bottom: 8px;
  position: relative;
}

header p {
  font-size: 1.05rem;
  opacity: 0.85;
  position: relative;
}

.container {
  max-width: 860px;
  margin: -36px auto 0;
  padding: 0 20px;
}

.nav-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.nav-link {
  background: white;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 10px 18px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.04);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover {
  background: var(--primary-light);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -4px rgba(79, 70, 229, 0.3);
}

.nav-link.active {
  background: var(--primary-color);
  color: white;
  box-shadow: 0 8px 20px -4px rgba(79, 70, 229, 0.3);
}

.card {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 36px;
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.06);
  margin-bottom: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px -12px rgba(0, 0, 0, 0.1);
}

.card h2 {
  font-size: 1.45rem;
  color: var(--text-primary);
  margin-bottom: 16px;
  border-bottom: 2px solid #F1F5F9;
  padding-bottom: 12px;
}

.card h3 {
  font-size: 1.1rem;
  color: var(--primary-color);
  margin: 22px 0 10px;
}

.card p {
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-size: 0.95rem;
}

.card ul {
  margin-left: 20px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.card li {
  margin-bottom: 8px;
  padding-left: 4px;
}

.card li::marker {
  color: var(--primary-color);
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.meta-item {
  background: linear-gradient(135deg, #F8FAFC, #EEF2FF);
  padding: 18px;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  transition: transform 0.2s ease;
}

.meta-item:hover {
  transform: translateY(-2px);
}

.meta-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-secondary);
  font-weight: 700;
}

.meta-value {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 4px;
}

.highlight-box {
  background: linear-gradient(135deg, #EEF2FF, #E0E7FF);
  border-left: 4px solid var(--primary-color);
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  margin: 16px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-green {
  background: #D1FAE5;
  color: #065F46;
}

.badge-blue {
  background: #DBEAFE;
  color: #1E40AF;
}

footer {
  text-align: center;
  margin-top: 48px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding: 24px 0;
  border-top: 1px solid var(--border-color);
}

footer strong {
  color: var(--primary-color);
}

/* Responsive */
@media (max-width: 640px) {
  header { padding: 36px 16px 52px; }
  header h1 { font-size: 1.8rem; }
  .container { padding: 0 14px; }
  .card { padding: 24px; }
  .nav-bar { gap: 6px; }
  .nav-link { font-size: 0.78rem; padding: 8px 12px; }
  .meta-grid { grid-template-columns: 1fr; }
}