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

:root {
  --primary: #007FFF;
  --accent: #708090;
  --accent-light: #007FFF;
  --text: #e0e0e0;
  --text-light: #a0a0a0;
  --bg: #0a0a15;
  --border: #2a2a3a;
  --code-bg: #1a1a2e;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
}

header {
  background: linear-gradient(180deg, rgba(10, 10, 21, 0.85) 0%, rgba(10, 10, 21, 0.9) 100%), url('images/main-background.png') center/cover;
  color: white;
  padding: 2rem 0;
  box-shadow: 0 4px 12px rgba(0, 127, 255, 0.2);
  border-top: 3px solid #007FFF;
  position: relative;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: #007FFF;
  letter-spacing: 0.05em;
  font-weight: 700;
}

header p {
  font-size: 1.1rem;
  opacity: 0.8;
  color: #007FFF;
}

nav {
  background: #0f0f1e;
  border-bottom: 1px solid var(--border);
  padding: 0;
  margin: 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

nav li {
  margin: 0;
}

nav a {
  display: block;
  padding: 1rem 1.5rem;
  color: #708090;
  text-decoration: none;
  border-bottom: 3px solid transparent;
  transition: all 0.2s;
}

nav a:hover {
  color: #007FFF;
  background-color: rgba(0, 127, 255, 0.1);
}

nav a.active {
  color: #007FFF;
  border-bottom-color: #007FFF;
  background-color: rgba(0, 127, 255, 0.08);
}

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

main {
  min-height: 60vh;
}

h1 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--accent-light);
  padding-bottom: 0.5rem;
}

h2 {
  font-size: 1.5rem;
  color: var(--accent);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.2rem;
  color: var(--primary);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-light);
  line-height: 1.8;
}

ul, ol {
  margin: 1rem 0 1rem 2rem;
  color: var(--text-light);
}

li {
  margin-bottom: 0.5rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-light);
  transition: color 0.2s;
}

a:hover {
  color: var(--primary);
}

code {
  background: var(--code-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.95em;
  color: #c7254e;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.9rem;
}

pre code {
  background: none;
  padding: 0;
  color: var(--text);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.card {
  background: #1a1a2e;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.card h3 {
  margin-top: 0;
  color: var(--accent);
}

.card a {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: #007FFF;
  color: white;
  border: none;
  border-radius: 4px;
  transition: background 0.2s;
}

.card a:hover {
  background: #0056cc;
  color: white;
}

.highlight {
  background: rgba(0, 127, 255, 0.1);
  padding: 1.5rem;
  border-left: 4px solid #007FFF;
  border-radius: 4px;
  margin: 1.5rem 0;
}

.highlight strong {
  color: var(--primary);
}

footer {
  background: #0f0f1e;
  color: white;
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid rgba(0, 127, 255, 0.3);
}

footer p {
  color: rgba(255,255,255,0.9);
  margin: 0.5rem 0;
}

footer a {
  color: #007FFF;
  border-bottom-color: #007FFF;
}

@media (max-width: 768px) {
  .container {
    padding: 1.5rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.2rem;
  }

  header h1 {
    font-size: 1.8rem;
  }

  nav ul {
    padding: 0 1rem;
  }

  nav a {
    padding: 0.75rem 1rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}