* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Ubuntu, sans-serif;
  background: #f6f7f9;
  color: #222;
}

.lang-switch {
  position: fixed;
  top: 12px;
  right: 12px;
}

.lang-switch button {
  margin-left: 4px;
  padding: 6px 10px;
  border: 1px solid #ccc;
  background: #fff;
  cursor: pointer;
  border-radius: 4px;
}

.lang-switch button:hover {
  background: #eee;
}

.container {
  max-width: 900px;
  margin: 60px auto;
  padding: 0 20px;
}

h1 {
  margin-bottom: 0.2em;
}

.subtitle {
  color: #666;
  margin-bottom: 2em;
}

section {
  margin-bottom: 2.5em;
}

h2 {
  border-bottom: 2px solid #ddd;
  padding-bottom: 0.3em;
}

.architecture,
.credentials {
  background: #fff;
  border: 1px solid #ddd;
  padding: 16px;
  overflow-x: auto;
}

ul {
  padding-left: 20px;
}

footer {
  text-align: center;
  font-size: 0.9em;
  color: #777;
  margin-top: 4em;
}