* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(160deg, #eef6ff, #f7fbff 45%, #ffffff);
  color: #0f2442;
}

.shell {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

h1 {
  margin: 0 0 8px;
}

.hint {
  margin: 0 0 24px;
  color: #37506f;
}

.panel {
  background: #ffffff;
  border: 1px solid #d4e3f3;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 5px 18px rgba(48, 79, 115, 0.08);
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

button {
  border: none;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  color: #ffffff;
  background: #165ca8;
}

button:hover {
  background: #134f90;
}

.status {
  margin: 0;
  font-weight: 600;
}

.code {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: Consolas, "Courier New", monospace;
  color: #123657;
}

@media (max-width: 640px) {
  .shell {
    padding: 20px 12px 24px;
  }
}