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

:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --primary-color: #667eea;
  --primary-dark: #5568d3;
  --secondary-color: #764ba2;
  --bg-color: #f7f9fc;
  --card-bg: #ffffff;
  --text-color: #2d3748;
  --text-light: #718096;
  --border-color: #e2e8f0;
  --success-color: #48bb78;
  --error-color: #f56565;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
.header {
  background: var(--card-bg);
  padding: 20px 30px;
  border-radius: 16px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo h1 {
  font-size: 24px;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #f0fdf4;
  border-radius: 20px;
}

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

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

.status-text {
  color: var(--success-color);
  font-size: 14px;
  font-weight: 500;
}

.status.disconnected .status-dot {
  background: var(--error-color);
}

.status.disconnected .status-text {
  color: var(--error-color);
}

.status.disconnected {
  background: #fef2f2;
}

/* Main Content */
.main-content {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  height: calc(100vh - 160px);
}

/* Sidebar */
.sidebar {
  background: var(--card-bg);
  padding: 24px;
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow-y: auto;
}

.sidebar h3 {
  margin-bottom: 16px;
  color: var(--text-color);
  font-size: 18px;
}

.suggestions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 24px;
}

.suggestion-btn {
  background: var(--bg-color);
  border: 2px solid var(--border-color);
  padding: 12px 16px;
  border-radius: 12px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 14px;
  color: var(--text-color);
}

.suggestion-btn:hover {
  border-color: var(--primary-color);
  background: #f0f4ff;
  transform: translateY(-2px);
}

.info-box {
  background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
  padding: 20px;
  border-radius: 12px;
  margin-top: 20px;
}

.info-box h4 {
  margin-bottom: 12px;
  color: var(--primary-color);
}

.info-box ul {
  list-style: none;
}

.info-box li {
  padding: 6px 0;
  font-size: 14px;
  color: var(--text-light);
}

.info-box strong {
  color: var(--text-color);
}

/* Chat Section */
.chat-section {
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  scroll-behavior: smooth;
}

.welcome-message {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.welcome-message h2 {
  color: var(--text-color);
  margin-bottom: 16px;
}

.welcome-message .subtitle {
  font-size: 14px;
  margin-top: 12px;
}

/* Messages */
.message {
  margin-bottom: 24px;
  animation: fadeIn 0.3s ease-in;
}

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

.message-user {
  display: flex;
  justify-content: flex-end;
}

.message-user .message-content {
  background: var(--primary-gradient);
  color: white;
  padding: 12px 18px;
  border-radius: 18px 18px 4px 18px;
  max-width: 70%;
  box-shadow: var(--shadow);
}

.message-assistant {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.message-assistant .message-content {
  background: var(--bg-color);
  color: var(--text-color);
  padding: 16px 20px;
  border-radius: 18px 18px 18px 4px;
  max-width: 85%;
  box-shadow: var(--shadow);
  white-space: pre-wrap;
  line-height: 1.6;
}

.message-image {
  margin-top: 12px;
  max-width: 85%;
}

.message-image img {
  width: 100%;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  transition: transform 0.2s;
}

.message-image img:hover {
  transform: scale(1.02);
  cursor: pointer;
}

.loading-message {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: var(--bg-color);
  border-radius: 18px;
  color: var(--text-light);
}

.loading-dots {
  display: flex;
  gap: 4px;
}

.loading-dots span {
  width: 8px;
  height: 8px;
  background: var(--primary-color);
  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 {
  border-top: 1px solid var(--border-color);
  padding: 20px 24px;
  background: var(--card-bg);
}

.input-wrapper {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

#messageInput {
  flex: 1;
  padding: 14px 20px;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  font-size: 15px;
  outline: none;
  transition: all 0.2s;
}

#messageInput:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.send-btn {
  background: var(--primary-gradient);
  color: white;
  border: none;
  padding: 14px 20px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.send-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.send-btn:active {
  transform: translateY(0);
}

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

.session-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-light);
}

.new-session-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-color);
  transition: all 0.2s;
}

.new-session-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* Scrollbar */
.chat-container::-webkit-scrollbar,
.sidebar::-webkit-scrollbar {
  width: 8px;
}

.chat-container::-webkit-scrollbar-track,
.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.chat-container::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.chat-container::-webkit-scrollbar-thumb:hover,
.sidebar::-webkit-scrollbar-thumb:hover {
  background: #cbd5e0;
}

/* Responsive */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
    height: auto;
  }

  .sidebar {
    order: 2;
    max-height: 400px;
  }

  .chat-section {
    order: 1;
    height: 600px;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 10px;
  }

  .header {
    flex-direction: column;
    gap: 16px;
    padding: 16px;
  }

  .logo h1 {
    font-size: 20px;
  }

  .message-content {
    max-width: 90% !important;
  }

  .input-wrapper {
    gap: 8px;
  }

  #messageInput {
    font-size: 14px;
  }
}

/* Error message */
.error-message {
  background: #fef2f2;
  color: var(--error-color);
  padding: 12px 18px;
  border-radius: 12px;
  border-left: 4px solid var(--error-color);
  margin-bottom: 16px;
}