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

:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #252525;
  --text-primary: #e5e5e5;
  --text-secondary: #888;
  --accent: #22c55e;
  --accent-hover: #16a34a;
  --danger: #ef4444;
  --border: #333;
  --user-bg: #22c55e;
  --user-text: #000;
  --bot-bg: #252525;
  --bot-text: #e5e5e5;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  justify-content: center;
}

.chat-container {
  width: 100%;
  max-width: 800px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
}

.chat-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-secondary);
}

.logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}

.status {
  font-size: 12px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.status::before {
  content: '●';
  color: var(--accent);
  animation: pulse 2s infinite;
}

.status.disconnected::before {
  color: var(--danger);
}

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

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message {
  display: flex;
  gap: 12px;
  max-width: 85%;
  animation: fadeIn 0.3s ease;
}

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

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

.message.bot {
  align-self: flex-start;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

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

.content {
  padding: 12px 16px;
  border-radius: 16px;
  line-height: 1.5;
  font-size: 15px;
  white-space: pre-wrap;
  word-wrap: break-word;
}

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

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

.message.error .content {
  background: #3f1a1a;
  color: #f87171;
  border: 1px solid #7f1d1d;
}

.message.typing .content {
  color: var(--text-secondary);
}

.message.typing .content::after {
  content: '...';
  animation: typing 1.5s infinite;
}

@keyframes typing {
  0%, 20% { content: '.'; }
  40% { content: '..'; }
  60%, 100% { content: '...'; }
}

.input-area {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 12px;
  background: var(--bg-secondary);
}

.input-area input {
  flex: 1;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.input-area input:focus {
  border-color: var(--accent);
}

.input-area input::placeholder {
  color: var(--text-secondary);
}

.input-area button {
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: var(--accent);
  color: #000;
  font-size: 18px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.input-area button:hover {
  background: var(--accent-hover);
}

.input-area button:active {
  transform: scale(0.95);
}

.input-area button:disabled {
  background: var(--text-secondary);
  cursor: not-allowed;
}

/* 移动端适配 */
@media (max-width: 600px) {
  .message {
    max-width: 90%;
  }
  
  .content {
    font-size: 14px;
    padding: 10px 14px;
  }
}