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

:root {
  --primary-color: #2563eb;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --border-color: #475569;
  --code-bg: #1e293b;
  --tool-bg: #312e81;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

.container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
}

/* Header */
.header {
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border-color);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.header-content h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-tertiary);
  border-radius: 0.5rem;
  font-size: 0.875rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success-color);
  animation: pulse 2s infinite;
}

.status.loading .status-dot {
  background: var(--warning-color);
}

.status.error .status-dot {
  background: var(--error-color);
  animation: none;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Chat Container */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 2rem 1.5rem;
  scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar {
  width: 8px;
}

.chat-container::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

.chat-container::-webkit-scrollbar-thumb {
  background: var(--bg-tertiary);
  border-radius: 4px;
}

.chat-container::-webkit-scrollbar-thumb:hover {
  background: var(--border-color);
}

/* Welcome Message */
.welcome-message {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  padding: 3rem 1rem;
}

.welcome-message h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
}

.welcome-message p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.welcome-message ul {
  list-style: none;
  text-align: left;
  max-width: 500px;
  margin: 0 auto 1.5rem;
}

.welcome-message ul li {
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  background: var(--bg-secondary);
  border-radius: 0.5rem;
  border-left: 3px solid var(--primary-color);
}

.welcome-message .note {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* Message */
.message {
  margin-bottom: 1.5rem;
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.875rem;
}

.message.user .message-header {
  color: var(--primary-color);
}

.message.assistant .message-header {
  color: var(--success-color);
}

.message-content {
  background: var(--bg-secondary);
  padding: 1rem 1.25rem;
  border-radius: 0.75rem;
  line-height: 1.6;
}

.message.user .message-content {
  background: var(--bg-tertiary);
  border-left: 3px solid var(--primary-color);
}

.message.assistant .message-content {
  border-left: 3px solid var(--success-color);
}

/* Tool Execution */
.tool-execution {
  background: var(--tool-bg);
  padding: 1rem;
  border-radius: 0.5rem;
  margin: 0.75rem 0;
  border-left: 3px solid var(--warning-color);
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--warning-color);
  font-size: 0.875rem;
}

.tool-details {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.tool-input {
  background: var(--bg-secondary);
  padding: 0.5rem;
  border-radius: 0.375rem;
  margin-top: 0.5rem;
  font-family: 'Courier New', monospace;
  font-size: 0.813rem;
  white-space: pre-wrap;
  word-break: break-all;
}

.tool-result {
  margin-top: 0.5rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: 0.375rem;
  font-family: 'Courier New', monospace;
  font-size: 0.813rem;
}

.tool-result.success {
  border-left: 2px solid var(--success-color);
}

.tool-result.error {
  border-left: 2px solid var(--error-color);
  color: var(--error-color);
}

/* Markdown Styling */
.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.message-content h1 {
  font-size: 1.5rem;
}

.message-content h2 {
  font-size: 1.25rem;
}

.message-content h3 {
  font-size: 1.125rem;
}

.message-content p {
  margin-bottom: 0.75rem;
}

.message-content ul,
.message-content ol {
  margin-left: 1.5rem;
  margin-bottom: 0.75rem;
}

.message-content li {
  margin-bottom: 0.25rem;
}

.message-content code {
  background: var(--code-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-family: 'Courier New', monospace;
  font-size: 0.875em;
}

.message-content pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 0.75rem 0;
}

.message-content pre code {
  background: none;
  padding: 0;
}

.message-content blockquote {
  border-left: 3px solid var(--border-color);
  padding-left: 1rem;
  margin: 0.75rem 0;
  color: var(--text-secondary);
}

.message-content a {
  color: var(--primary-color);
  text-decoration: none;
}

.message-content a:hover {
  text-decoration: underline;
}

/* Input Container */
.input-container {
  background: var(--bg-secondary);
  border-top: 2px solid var(--border-color);
  padding: 1.5rem;
  flex-shrink: 0;
}

#chatForm {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

#messageInput {
  flex: 1;
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  resize: none;
  transition: border-color 0.2s;
}

#messageInput:focus {
  outline: none;
  border-color: var(--primary-color);
}

.input-hint {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-align: center;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

kbd {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 0.25rem;
  padding: 0.125rem 0.375rem;
  font-family: monospace;
  font-size: 0.75rem;
}

.loader {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Responsive */
@media (max-width: 768px) {
  .header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .chat-container {
    padding: 1rem;
  }

  #chatForm {
    flex-direction: column;
  }

  .welcome-message {
    padding: 1.5rem 0.5rem;
  }

  .welcome-message h2 {
    font-size: 1.5rem;
  }
}