:root {
  --bg: #0f1020;
  --surface: #141528;
  --card: #1e1f3a;
  --card-elevated: #252648;
  --primary: #6e4bff;
  --primary-light: #9b7ff8;
  --secondary: #2ec5ff;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: rgba(255, 255, 255, 0.08);
  --glass: rgba(30, 31, 58, 0.72);
  --radius: 18px;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(110, 75, 255, 0.22), transparent),
    radial-gradient(ellipse 60% 40% at 90% 10%, rgba(46, 197, 255, 0.14), transparent);
  pointer-events: none;
  z-index: -1;
}

a { color: var(--secondary); text-decoration: none; }
a:hover { color: var(--primary-light); }

.container {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(15, 16, 32, 0.82);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand img { width: 40px; height: 40px; border-radius: 12px; }

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  font-size: 0.88rem;
}

.nav-links a { color: var(--text-secondary); }
.nav-links a.active, .nav-links a:hover { color: var(--text); }

main { padding: 40px 0 72px; }

.glass {
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero {
  padding: 48px 32px;
  text-align: center;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  background: linear-gradient(135deg, var(--primary-light), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 12px;
}

.hero p { color: var(--text-secondary); max-width: 560px; margin: 0 auto 24px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 14px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.content {
  padding: 36px 32px;
}

.content h1 {
  font-size: 1.9rem;
  margin-bottom: 8px;
}

.content .updated {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 28px;
}

.content h2 {
  font-size: 1.2rem;
  margin: 28px 0 10px;
  color: var(--primary-light);
}

.content h3 {
  font-size: 1rem;
  margin: 18px 0 8px;
  color: var(--secondary);
}

.content p, .content li { color: var(--text-secondary); margin-bottom: 12px; }

.content ul, .content ol { padding-left: 22px; margin-bottom: 16px; }

.content li { margin-bottom: 8px; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 0.92rem;
}

.data-table th, .data-table td {
  border: 1px solid var(--border);
  padding: 12px;
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--card);
  color: var(--text);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.card-link {
  padding: 22px;
  display: block;
  color: inherit;
  transition: transform 0.2s, border-color 0.2s;
}

.card-link:hover {
  transform: translateY(-2px);
  border-color: rgba(110, 75, 255, 0.35);
  color: inherit;
}

.card-link h3 { color: var(--text); margin-bottom: 6px; }
.card-link p { margin: 0; font-size: 0.9rem; }

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  justify-content: space-between;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 12px 18px; }

.faq details {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 10px;
  background: rgba(20, 21, 40, 0.6);
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
}

.error-page {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
}

@media (max-width: 640px) {
  .content, .hero { padding: 28px 20px; }
  .nav { flex-direction: column; align-items: flex-start; }
  .data-table { font-size: 0.82rem; }
  .data-table th, .data-table td { padding: 8px; }
}