* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  background: #f6f8fa;
  color: #24292f;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid #d0d7de;
}

h1 {
  margin: 0;
  font-size: 24px;
}

#auth-status {
  display: flex;
  align-items: center;
  gap: 12px;
}

#login-btn {
  background: #24292f;
  color: white;
  padding: 8px 16px;
  border-radius: 6px;
  text-decoration: none;
}

#login-btn:hover {
  background: #32383f;
}

#logout-btn {
  background: none;
  border: 1px solid #d0d7de;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
}

main {
  background: white;
  padding: 24px;
  border-radius: 6px;
  border: 1px solid #d0d7de;
}

.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-row .form-group {
  flex: 1;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 4px;
}

input[type="text"] {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid #d0d7de;
  border-radius: 6px;
  font-size: 14px;
}

small {
  color: #57606a;
  font-size: 12px;
}

button[type="submit"] {
  background: #2da44e;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

button[type="submit"]:hover {
  background: #2c974b;
}

#loading {
  text-align: center;
  padding: 40px;
  color: #57606a;
}

#error {
  color: #cf222e;
  padding: 12px;
  background: #ffebe9;
  border-radius: 6px;
  margin-top: 16px;
  display: none;
}

#error:not(:empty) {
  display: block;
}

#diff-stats {
  margin: 16px 0;
  padding: 12px;
  background: #f6f8fa;
  border-radius: 6px;
}

#diff-container {
  margin-top: 16px;
}

.d2h-wrapper {
  border-radius: 6px;
  overflow: hidden;
}