*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

nav {
  background: #1a1a1a;
  padding: 0 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

nav ul li a {
  display: block;
  padding: 0.75rem 0.9rem;
  color: #ccc;
  text-decoration: none;
  font-size: 0.875rem;
  white-space: nowrap;
}

nav ul li a:hover,
nav ul li a.active {
  color: #fff;
  background: #333;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

h1 { font-size: 1.9rem; font-weight: 700; margin: 0 0 0.5rem; color: #111; }
h2 { font-size: 1.35rem; font-weight: 600; margin: 2.5rem 0 0.75rem; color: #111; border-bottom: 1px solid #e0e0e0; padding-bottom: 0.3rem; }
h3 { font-size: 1.1rem; font-weight: 600; margin: 1.75rem 0 0.5rem; color: #333; }
h4 { font-size: 0.95rem; font-weight: 600; margin: 1.25rem 0 0.4rem; color: #444; text-transform: uppercase; letter-spacing: 0.03em; }

p { margin: 0 0 1rem; }
a { color: #0057b8; text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.875em;
  background: #f3f3f3;
  border: 1px solid #ddd;
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

pre {
  background: #f5f5f5;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
  line-height: 1.45;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.85rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 1.75rem;
  font-size: 0.9rem;
}

th {
  background: #f0f0f0;
  text-align: left;
  padding: 0.55rem 0.75rem;
  font-weight: 600;
  border: 1px solid #ccc;
}

td {
  padding: 0.5rem 0.75rem;
  border: 1px solid #ddd;
  vertical-align: top;
}

tr:nth-child(even) td { background: #fafafa; }

ul, ol { margin: 0 0 1rem; padding-left: 1.5rem; }
li { margin-bottom: 0.3rem; }

.subtitle {
  color: #555;
  font-size: 1rem;
  margin-bottom: 2rem;
}

.component-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.component-card {
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 1rem 1.25rem;
  background: #fafafa;
}

.component-card h3 {
  margin-top: 0;
  font-size: 1rem;
  color: #111;
}

.component-card p {
  margin-bottom: 0;
  font-size: 0.875rem;
  color: #444;
}

.note {
  background: #f0f4ff;
  border-left: 3px solid #0057b8;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.warning {
  background: #fff8e1;
  border-left: 3px solid #f0a500;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  nav ul { flex-direction: column; }
  nav ul li a { padding: 0.6rem 1rem; border-bottom: 1px solid #2a2a2a; }
  h1 { font-size: 1.5rem; }
  .container { padding: 1.25rem 1rem 3rem; }
}