:root {
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-muted: #5f6368;
  --color-border: #e0e0e0;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-danger: #b91c1c;
  --color-danger-bg: #fef2f2;
  --radius: 6px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.page-header {
  margin-bottom: 32px;
}

.page-header h1 {
  font-size: 28px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.subtitle {
  color: var(--color-muted);
  font-size: 15px;
  margin: 0;
}

.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.card-heading {
  display: block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-muted);
  margin: 0 0 10px;
}

.key-row {
  display: flex;
  gap: 8px;
}

.key-input {
  flex: 1;
  min-width: 0;
  font-family: var(--mono);
  font-size: 14px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  background: var(--color-bg);
}

.key-input:focus,
.message-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.hint {
  font-size: 13px;
  color: var(--color-muted);
  margin: 10px 0 0;
}

.message-input {
  width: 100%;
  font-family: var(--font);
  font-size: 14px;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  background: var(--color-bg);
  resize: vertical;
}

.examples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
}

.examples-label {
  font-size: 13px;
  color: var(--color-muted);
  margin-right: 2px;
}

.example-btn {
  font-family: var(--font);
  font-size: 13px;
  padding: 6px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  cursor: pointer;
}

.example-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
  margin-top: 16px;
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn-primary:disabled {
  background: #93b4f0;
  border-color: #93b4f0;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border-color: var(--color-border);
  white-space: nowrap;
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.error-message {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--color-danger-bg);
  color: var(--color-danger);
  font-size: 14px;
}

.result-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 16px;
  row-gap: 10px;
  margin: 0;
}

.result-grid dt {
  color: var(--color-muted);
  font-size: 14px;
}

.result-grid dd {
  margin: 0;
  font-weight: 500;
  font-size: 14px;
}

.raw-response {
  margin-top: 20px;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
}

.raw-response summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--color-muted);
  user-select: none;
}

.raw-response pre {
  margin: 12px 0 0;
  padding: 12px;
  background: #fafafa;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 12px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.page-footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-muted);
}

.page-footer p {
  margin: 0 0 8px;
}

.page-footer a {
  color: var(--color-accent);
  text-decoration: none;
}

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

@media (max-width: 480px) {
  .container {
    padding: 32px 16px 48px;
  }

  .key-row {
    flex-wrap: wrap;
  }

  .key-input {
    flex-basis: 100%;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111111;
    --color-text: #f2f2f2;
    --color-muted: #9a9a9a;
    --color-border: #2e2e2e;
    --color-danger-bg: #2a1414;
  }

  .raw-response pre {
    background: #171717;
  }
}