:root {
  --bg-primary: #0a0c10;
  --bg-secondary: #12151c;
  --bg-card: rgba(22, 27, 36, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.16);
  --text-primary: #f0f3f6;
  --text-secondary: #9aa5b5;
  --text-muted: #626d7f;
  --accent: #4fa3d1;
  --accent-glow: rgba(79, 163, 209, 0.15);
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.65;
  font-size: 16px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  background: linear-gradient(135deg, #ffffff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(79, 163, 209, 0.3);
  font-weight: 500;
  letter-spacing: 0.05em;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

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

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

main {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.content-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  color: #ffffff;
}

.doc-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  font-family: var(--font-mono);
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 2.25rem;
  margin-bottom: 0.75rem;
  color: #ffffff;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.5rem;
}

strong {
  color: var(--text-primary);
  font-weight: 600;
}

.callout {
  background: rgba(79, 163, 209, 0.08);
  border-left: 3px solid var(--accent);
  padding: 1.25rem;
  border-radius: 0 12px 12px 0;
  margin: 1.5rem 0;
}

.callout-title {
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.hero {
  text-align: center;
  padding: 4rem 1rem 3rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 2.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  background: rgba(26, 32, 44, 0.8);
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: #ffffff;
}

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

.card-link {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

footer {
  border-top: 1px solid var(--border-color);
  padding: 2.5rem 1.5rem;
  background: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
  margin-top: auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--text-primary);
}

@media (max-width: 640px) {
  .hero h1 {
    font-size: 2.25rem;
  }
  .content-card {
    padding: 1.5rem;
  }
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }
}