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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #1f2937;
  line-height: 1.6;
}

code, pre {
  font-family: 'SF Mono', Monaco, Consolas, 'Courier New', monospace;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: #111;
  color: #fff;
  padding: 60px 20px;
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.tagline {
  font-size: 1.2rem;
  opacity: 0.8;
}

main {
  padding: 48px 20px;
}

section {
  margin-bottom: 48px;
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

h3 {
  font-size: 1.1rem;
  margin-top: 24px;
  margin-bottom: 8px;
}

p {
  color: #4b5563;
  margin-bottom: 12px;
}

.code-block {
  background: #f3f4f6;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  padding: 16px;
  margin: 12px 0;
  overflow-x: auto;
  font-size: 0.9rem;
}

.code-block pre {
  margin: 0;
}

.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.icon-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
}

.icon-item img {
  border-radius: 4px;
}

.icon-item span {
  font-size: 0.8rem;
  color: #6b7280;
}

ul {
  list-style: none;
  padding: 0;
}

ul li {
  padding: 10px 0;
  border-bottom: 1px solid #f3f4f6;
  color: #4b5563;
}

ul li strong {
  color: #1f2937;
}

footer {
  border-top: 1px solid #e5e7eb;
  padding: 32px 20px;
  text-align: center;
}

footer a {
  color: #4b5563;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

@media (max-width: 480px) {
  header h1 { font-size: 2rem; }
  .icon-grid { grid-template-columns: repeat(2, 1fr); }
}