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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: #333;
  background: #f5f5f5;
  padding: 24px;
  max-width: 640px;
  margin: 0 auto;
}

h1 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
}

h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #ddd;
}

section {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.field {
  margin-bottom: 16px;
}

.field:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-weight: 500;
  margin-bottom: 4px;
}

input[type="text"],
input[type="url"],
input[type="password"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-size: 14px;
  font-family: inherit;
}

input[type="text"]:focus,
input[type="url"]:focus,
input[type="password"]:focus {
  outline: none;
  border-color: #4a90d9;
  box-shadow: 0 0 0 2px rgba(74, 144, 217, 0.2);
}

.checkbox-field {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-field input[type="checkbox"] {
  width: 16px;
  height: 16px;
}

.checkbox-field label {
  margin-bottom: 0;
  font-weight: 400;
}

button {
  padding: 8px 16px;
  border: 1px solid #ccc;
  border-radius: 4px;
  background: #fff;
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
}

button:hover {
  background: #f0f0f0;
}

button.primary {
  background: #4a90d9;
  color: #fff;
  border-color: #4a90d9;
}

button.primary:hover {
  background: #3a7bc8;
}

.button-row {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.status-msg {
  margin-top: 8px;
  font-size: 13px;
  color: #666;
}

.status-msg.error {
  color: #c0392b;
}

.status-msg.success {
  color: #27ae60;
}

.diag-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
  margin-bottom: 16px;
}

.diag-grid dt {
  font-weight: 500;
  color: #666;
}

.diag-grid dd {
  font-weight: 400;
}

.feature-description {
  font-size: 12px;
  color: #888;
  margin-top: 8px;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #1a1a1a;
    color: #ddd;
  }

  section {
    background: #2a2a2a;
    border-color: #444;
  }

  h2 {
    border-bottom-color: #444;
  }

  input[type="text"],
  input[type="url"],
  input[type="password"] {
    background: #333;
    border-color: #555;
    color: #ddd;
  }

  button {
    background: #333;
    border-color: #555;
    color: #ddd;
  }

  button:hover {
    background: #444;
  }

  button.primary {
    background: #4a90d9;
    border-color: #4a90d9;
    color: #fff;
  }

  .diag-grid dt {
    color: #999;
  }

  .feature-description {
    color: #777;
  }
}