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

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --border-color: #30363d;
  --text-primary: #c9d1d9;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent-primary: #58a6ff;
  --accent-success: #3fb950;
  --accent-warning: #d29922;
  --accent-danger: #f85149;
  --message-user-bg: #1f6feb;
  --message-assistant-bg: #21262d;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 900px;
  margin: 0 auto;
}

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

.header-content h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover {
  background-color: #4c95e8;
  border-color: #4c95e8;
}

.btn-icon {
  padding: 0.5rem;
  border-radius: 6px;
}

/* Settings Panel */
.settings-panel {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.settings-panel.open {
  display: flex;
}

.settings-content {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  width: 100%;
  max-width: 450px;
  margin: 1rem;
}

.settings-content h2 {
  font-size: 1.125rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-group input {
  width: 100%;
  padding: 0.625rem 0.75rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.875rem;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.form-group textarea {
  width: 100%;
  padding: 0.625rem 0.75rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.8125rem;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  resize: vertical;
  min-height: 120px;
}

.btn-small {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

.help-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.help-text a {
  color: var(--accent-primary);
  text-decoration: none;
}

.help-text a:hover {
  text-decoration: underline;
}

.settings-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.5rem;
}

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

.messages {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Messages */
.message {
  display: flex;
  gap: 0.75rem;
  max-width: 85%;
}

.message.user {
  margin-left: auto;
  flex-direction: row-reverse;
}

.message.assistant {
  margin-right: auto;
}

.message-content {
  padding: 0.75rem 1rem;
  border-radius: 12px;
  font-size: 0.9375rem;
}

.message.user .message-content {
  background-color: var(--message-user-bg);
  border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
  background-color: var(--message-assistant-bg);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 4px;
}

.message-content p {
  margin-bottom: 0.5rem;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content ul,
.message-content ol {
  margin: 0.5rem 0;
  padding-left: 1.5rem;
}

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

.message-content code {
  background-color: var(--bg-primary);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-family: 'SF Mono', Monaco, Consolas, monospace;
  font-size: 0.875em;
}

.message-content pre {
  background-color: var(--bg-primary);
  padding: 0.75rem;
  border-radius: 6px;
  overflow-x: auto;
  margin: 0.5rem 0;
}

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

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

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

.message-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.message-content h1,
.message-content h2,
.message-content h3 {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.message-content h1 {
  font-size: 1.25rem;
}

.message-content h2 {
  font-size: 1.125rem;
}

.message-content h3 {
  font-size: 1rem;
}

/* Search Info */
.search-info {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

/* Loading State */
.message.loading .message-content {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.loading-dots {
  display: flex;
  gap: 0.25rem;
}

.loading-dots span {
  width: 6px;
  height: 6px;
  background-color: var(--text-secondary);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) {
  animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes bounce {
  0%, 80%, 100% {
    transform: scale(0);
  }
  40% {
    transform: scale(1);
  }
}

/* Input Area */
.input-area {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-secondary);
}

.chat-form {
  display: flex;
  gap: 0.75rem;
}

.chat-form input {
  flex: 1;
  padding: 0.75rem 1rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.chat-form input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.chat-form input::placeholder {
  color: var(--text-muted);
}

.input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  text-align: center;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Responsive */
@media (max-width: 640px) {
  .header {
    padding: 0.75rem 1rem;
  }

  .header-content h1 {
    font-size: 1.125rem;
  }

  .subtitle {
    display: none;
  }

  .chat-container {
    padding: 0.75rem;
  }

  .message {
    max-width: 92%;
  }

  .input-area {
    padding: 0.75rem 1rem;
  }
}