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

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;
  --text-primary: #e0e0e8;
  --text-secondary: #8888a0;
  --accent: #6c5ce7;
  --accent-glow: rgba(108, 92, 231, 0.3);
  --user-bg: #2d2d44;
  --bot-bg: #1a1a2e;
  --border: #2a2a3e;
  --danger: #e74c3c;
  --success: #2ecc71;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a29bfe);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  font-size: 12px;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.stats-badge {
  font-size: 11px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 4px 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

/* Chat area */
.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar {
  width: 6px;
}
.chat-container::-webkit-scrollbar-track {
  background: transparent;
}
.chat-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.welcome {
  text-align: center;
  padding: 60px 20px;
  max-width: 600px;
  margin: 0 auto;
}

.welcome h2 {
  font-size: 22px;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.welcome p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  font-size: 14px;
}

.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.suggestion {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
}

.suggestion:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: rgba(108, 92, 231, 0.1);
}

/* Messages */
.message {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}

.message.user .message-avatar {
  background: var(--user-bg);
}

.message.assistant .message-avatar {
  background: var(--accent);
}

.message-content {
  padding: 10px 16px;
  border-radius: 12px;
  max-width: 75%;
  line-height: 1.6;
  font-size: 14px;
  white-space: pre-wrap;
  word-wrap: break-word;
}

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

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

.message-content p {
  margin-bottom: 8px;
}
.message-content p:last-child {
  margin-bottom: 0;
}

.message-content strong {
  color: #a29bfe;
}

.message-content code {
  background: rgba(108, 92, 231, 0.15);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 13px;
}

/* Typing indicator */
.typing {
  display: flex;
  gap: 4px;
  padding: 4px 0;
}

.typing span {
  width: 6px;
  height: 6px;
  background: var(--text-secondary);
  border-radius: 50%;
  animation: bounce 1.4s infinite;
}

.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-6px); }
}

/* Input area */
.input-container {
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.input-wrapper {
  display: flex;
  gap: 10px;
  max-width: 800px;
  margin: 0 auto;
}

#message-input {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 14px;
  font-family: inherit;
  resize: none;
  outline: none;
  min-height: 44px;
  max-height: 120px;
  transition: border-color 0.2s;
}

#message-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

#message-input::placeholder {
  color: var(--text-secondary);
}

#send-btn {
  background: var(--accent);
  color: white;
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

#send-btn:hover {
  background: #5b4bd5;
  transform: scale(1.05);
}

#send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

#send-btn svg {
  width: 18px;
  height: 18px;
}

.disclaimer {
  text-align: center;
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 8px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Mobile */
@media (max-width: 640px) {
  .header { padding: 10px 14px; }
  .chat-container { padding: 12px; }
  .message-content { max-width: 85%; font-size: 13px; }
  .input-container { padding: 10px 14px; }
  .suggestions { gap: 6px; }
  .suggestion { font-size: 12px; padding: 6px 12px; }
}