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

:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #1e293b;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --code-bg: #f1f5f9;
  --accent: #7c3aed;
}

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

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary);
}

nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

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

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

.breadcrumb {
  max-width: 1200px;
  margin: 1rem auto;
  padding: 0 2rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

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

.hero {
  text-align: center;
  padding: 3rem 0;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.tech-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
  transition: all 0.3s;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.tech-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
  transform: translateY(-2px);
}

.tech-card h2 {
  color: var(--primary);
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.tech-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.overview-header {
  margin-bottom: 3rem;
}

.overview-header h1 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.overview-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.overview-section h2 {
  color: var(--primary);
  font-size: 1.3rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.5rem;
}

.overview-section h3 {
  color: var(--accent);
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.use-cases-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.use-case-item {
  background: var(--code-bg);
  border-left: 4px solid var(--primary);
  padding: 1.5rem;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  color: inherit;
}

.use-case-item:hover {
  background: #e0e7ff;
  transform: translateX(4px);
}

.use-case-item strong {
  color: var(--primary);
  display: block;
  margin-bottom: 0.5rem;
}

.use-case-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.use-case-detail {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.use-case-detail h2 {
  color: var(--primary);
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.use-case-detail h3 {
  color: var(--accent);
  font-size: 1.1rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

code {
  background: var(--code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
}

pre {
  background: #1e1e1e;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1rem 0;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  color: #d4d4d4;
}

/* Prism syntax highlighting */
pre[class*="language-"] {
  background: #1e1e1e;
  color: #d4d4d4;
}

code[class*="language-"] {
  background: none;
  color: #d4d4d4;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: #6a9955;
}

.token.punctuation {
  color: #d4d4d4;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
  color: #b5cea8;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: #ce9178;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
  color: #d4d4d4;
}

.token.atrule,
.token.attr-value,
.token.keyword {
  color: #569cd6;
}

.token.function,
.token.class-name {
  color: #dcdcaa;
}

.token.regex,
.token.important,
.token.variable {
  color: #9cdcfe;
}

.code-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

ul, ol {
  margin-left: 1.5rem;
  margin-top: 0.5rem;
}

li {
  margin-bottom: 0.5rem;
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

.back-link:hover {
  text-decoration: underline;
}

.footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}

@media (max-width: 768px) {
  nav ul {
    gap: 1rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

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

  main {
    padding: 1rem;
  }

  .overview-section {
    padding: 1.5rem;
  }
}