@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface-2: #242836;
  --border: #2e3347;
  --text: #e2e8f0;
  --text-muted: #8892a4;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --success: #22c55e;
  --error: #ef4444;
  --radius: 12px;
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

html, body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  padding: 0.15rem 0.5rem;
  border-radius: 99px;
  letter-spacing: 0;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Status Bar */
.status-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1.25rem;
  font-size: 0.8125rem;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-ok { background: var(--success); box-shadow: 0 0 6px var(--success); }
.dot-err { background: var(--error); box-shadow: 0 0 6px var(--error); }

.label {
  color: var(--text-muted);
}

/* Input Section */
.input-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.input-group {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

textarea {
  flex: 1;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  resize: none;
  outline: none;
  transition: border-color 0.2s;
}

textarea:focus {
  border-color: var(--accent);
}

textarea::placeholder {
  color: var(--text-muted);
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s, transform 0.1s;
  flex-shrink: 0;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
}

button:active:not(:disabled) {
  transform: scale(0.97);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Response Section */
.response-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  flex: 1;
}

.response-section h2 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

pre {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  color: #a5b4fc;
  min-height: 80px;
}

/* Footer */
footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  margin-top: 2rem;
}

@media (max-width: 500px) {
  .container { padding: 2rem 1rem; }
  .input-group { flex-direction: column; }
  button { width: 100%; }
}