:root {
  /* Light Theme Variables */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-message-user: #e31837;
  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-on-red: #ffffff;
  --border-color: #f3f4f6;
  --border-input: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --hover-btn: #f3f4f6;
}

.chatbot-container.dark, body.dark {
  /* Dark Theme Variables */
  --bg-primary: #121212; /* Slightly deeper dark */
  --bg-secondary: #1e1e1e;
  --bg-message-user: #e31837;
  --text-primary: #ffffff;
  --text-secondary: #d4d4d4; /* Much brighter for readability */
  --border-color: #2a2a2a;
  --border-input: #3a3a3a;
  --hover-btn: #2a2a2a;
}

/* Global Resets */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  overflow-x: hidden;
  width: 100%;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease;
  min-height: 100vh;
}

/* Container */
.chatbot-container {
  width: 100%;
  max-width: 1000px;
  height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  position: relative;
  font-family: 'Inter', sans-serif;
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Header */
.chat-header {
  height: 70px;
  padding: 0 24px;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

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

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.header-logo img {
  object-fit: contain;
}

.header-title h1 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 0;
}

.lang-switcher, .theme-switcher {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background-color: transparent;
  border: none;
  color: var(--text-primary); /* Higher contrast */
  padding: 8px;
  border-radius: 50%; /* For circular hover */
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  height: 38px;
  min-width: 38px;
}

.theme-switcher {
  width: 38px;
  padding: 0;
}

.lang-switcher:hover, .theme-switcher:hover {
  background-color: var(--hover-btn);
  color: var(--text-primary);
}

.new-chat-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-input);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  padding: 0 20px;
  height: 38px;
  border-radius: 20px; /* Pill-shaped */
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-sm);
  min-width: 140px; /* Stabilize size */
}

.new-chat-btn:hover {
  background-color: var(--bg-primary);
  border-color: #9ca3af;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.new-chat-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

/* Chat Window */
.chat-window {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
}

.chat-window::-webkit-scrollbar {
  width: 6px;
}
.chat-window::-webkit-scrollbar-thumb {
  background-color: var(--border-input);
  border-radius: 10px;
}

/* Welcome Screen */
.welcome-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 20px;
  margin: auto; /* Vertically and horizontally centered */
  width: 100%;
  max-width: 800px;
  min-height: min-content;
}

.welcome-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  max-height: 15vh; /* Reduced height as it's smaller now */
}

.welcome-logo img {
  max-height: 100%;
  width: auto;
  height: auto;
  max-width: 100px; /* Reduced to 1/2 size as requested */
  object-fit: contain;
}

.welcome-container h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.welcome-subtitle {
  font-size: clamp(12px, 2vw, 14px);
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.5;
  white-space: nowrap;
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Knowledge Base Button */
.knowledge-base-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background-color: transparent;
  border: 1px solid var(--border-input);
  color: var(--text-primary); /* Ensure white in dark mode */
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 32px;
  min-width: 160px; /* Stabilize size */
}

.knowledge-base-btn:hover {
  background-color: var(--hover-btn);
  color: var(--text-primary);
  border-color: #9ca3af;
  transform: translateY(-1px);
}

/* Suggestion Chips */
.suggestion-chips {
  display: flex;
  flex-wrap: nowrap; /* Single line as requested */
  overflow-x: auto; /* Horizontal scroll if too long */
  gap: 12px;
  justify-content: center; /* Center if enough space */
  width: 100%;
  max-width: 800px; /* Wider to match input area visibility better */
  padding: 4px 10px;
  scrollbar-width: none; /* Hide scrollbar Firefox */
  -ms-overflow-style: none; /* Hide scrollbar IE/Edge */
}

.suggestion-chips::-webkit-scrollbar {
  display: none; /* Hide scrollbar Chrome/Safari */
}

.suggestion-chips button {
  flex-shrink: 0; /* Don't squash buttons */
  background-color: var(--bg-primary);
  border: 1px solid var(--border-input);
  color: var(--text-primary); /* Use primary text (white in dark mode) */
  padding: 10px 18px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-sm);
  height: 44px; /* Consistent height */
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.suggestion-chips button:hover {
  background-color: var(--hover-btn);
  border-color: #9ca3af;
  color: var(--text-primary);
  transform: translateY(-1px);
}

/* Messages */
.messages-list {
  display: flex;
  flex-direction: column;
  padding: 20px 0;
  gap: 16px;
}

.message-row {
  display: flex;
  padding: 8px 24px;
  gap: 16px;
  width: 100%;
}

.message-row.bot {
  justify-content: flex-start;
  background-color: transparent; /* No background for bot */
}

.message-row.user {
  justify-content: flex-end; /* User on the right */
}

.message-content {
  width: 100%;
  max-width: 100%;
  overflow-wrap: break-word;
  font-size: 16px;
  line-height: 1.6;
}

.message-row.user .message-content {
  display: flex;
  justify-content: flex-end;
  max-width: 80%;
}

.user-text {
  white-space: pre-wrap;
  color: var(--text-on-red);
  background-color: var(--bg-message-user); /* Pizza Hut Red Bubble */
  padding: 12px 18px;
  border-radius: 20px 20px 2px 20px;
  box-shadow: 0 2px 8px rgba(227, 24, 55, 0.15);
}

/* Bot message wrapper for copy button positioning */
.bot-message-wrapper {
  position: relative;
  width: 100%;
}

.copy-btn {
  background-color: transparent;
  color: #9ca3af; /* Gray icon */
  margin-top: 12px;
  margin-left: -8px; /* Alignment with text */
  border: none;
  cursor: pointer;
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  border-radius: 50%; /* Circular */
  opacity: 0; /* Hidden by default */
  width: 36px;
  height: 36px;
}

/* Always show icon for the latest response */
.bot-message-wrapper.latest .copy-btn {
  opacity: 1;
}

/* Show icon on hover for all responses */
.bot-message-wrapper:hover .copy-btn {
  opacity: 1;
}

.copy-btn:hover {
  background-color: var(--hover-btn); /* Light circular hover */
  color: var(--text-primary); /* Darker on hover */
}

/* React Markdown Styles */
.markdown-body {
  color: var(--text-primary);
  width: 100%;
}

.markdown-body p {
  margin-bottom: 12px;
}

.markdown-body p:last-child {
  margin-bottom: 0;
}

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

.markdown-body ul, .markdown-body ol {
  margin-bottom: 12px;
  padding-left: 24px;
}

.markdown-body li {
  margin-bottom: 4px;
}

.markdown-body code {
  background-color: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: 'Consolas', monospace;
  color: var(--text-primary);
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  align-items: center;
  height: 24px;
  gap: 4px;
}

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

.dot1 { animation-delay: -0.32s; }
.dot2 { animation-delay: -0.16s; }

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

/* Input Area */
.input-area {
  padding: 16px 24px 24px 24px;
  background-color: var(--bg-primary);
}

.input-container {
  display: flex;
  align-items: flex-end;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-input);
  border-radius: 16px;
  padding: 4px;
  transition: all 0.2s;
  position: relative;
}

.input-container:focus-within {
  border-color: #9ca3af;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.chat-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 12px 16px;
  font-size: 16px;
  color: var(--text-primary);
  font-family: inherit;
  resize: none;
  max-height: 200px;
  min-height: 48px;
  line-height: 1.5;
}

.chat-input:focus {
  outline: none;
}

.chat-input::placeholder {
  color: #9ca3af;
}

.send-button {
  background-color: transparent;
  color: #e31837; /* Pizza Hut Red */
  border: none;
  width: 36px;
  height: 48px; /* Match input height */
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin: 0 8px;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.send-button:not(.disabled):hover {
  transform: scale(1.1);
  color: #ff5e62;
}

.send-button.disabled {
  background-color: transparent;
  color: #e5e7eb;
  cursor: not-allowed;
}

.footer-text {
  text-align: center;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 12px;
}

/* Responsive */
@media (max-width: 768px) {
  .chatbot-container {
    width: 100%;
    height: 100vh;
    height: 100dvh;
    margin: 0;
    border-radius: 0;
    max-width: 100%;
  }

  .chat-header {
    padding: 0 16px;
  }

  .header-title h1 {
    font-size: 14px;
  }

  .header-right {
    gap: 8px; /* Tighter gap on mobile */
  }

  .lang-switcher span, .new-chat-btn span {
    display: none; /* Hide text to save space */
  }

  .lang-switcher, .theme-switcher, .new-chat-btn {
    padding: 8px;
    width: 38px;
    min-width: 38px;
    border-radius: 50%; /* Icon only style */
  }

  .welcome-container {
    padding-top: 40px;
  }

  .welcome-logo img {
    max-width: 80px; /* Proportional reduction for mobile */
  }

  .welcome-container h2 {
    font-size: 20px;
  }

  .message-row {
    padding: 8px 16px;
    gap: 12px;
  }

  .message-content {
    max-width: 90%;
    font-size: 15px;
  }

  .user-text {
    padding: 10px 14px;
  }

  .input-area {
    padding: 12px 16px 20px 16px;
  }

  .chat-input {
    font-size: 16px; /* Prevents iOS zoom */
    padding: 10px 12px;
  }
}

@media (max-width: 480px) {
  .header-title {
    display: none; /* Only logo on very small screens if needed */
  }

  .welcome-logo img {
    max-width: 70px; /* Even smaller for very small screens */
  }

  .suggestion-chips {
    justify-content: flex-start; /* Ensure scrolling starts from left */
    padding-left: 16px;
    padding-right: 16px;
  }

  .welcome-subtitle {
    font-size: 13px;
    margin-bottom: 24px;
    padding: 0 10px;
    white-space: normal; /* Allow wrap on very small screens to avoid horizontal scroll of plain text */
    text-overflow: clip;
    overflow: visible;
  }

  .modal-content {
    margin: 20px; /* Prevent touching edges on mobile */
    max-height: 85vh;
  }
}

/* Knowledge Base Button */
.knowledge-base-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: transparent;
  border: 1px solid #e5e7eb;
  color: #6b7280;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-bottom: 32px;
}

.knowledge-base-btn:hover {
  background-color: #f9fafb;
  color: #374151;
  border-color: #d1d5db;
  transform: translateY(-1px);
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6); /* Darker for better contrast */
  backdrop-filter: blur(8px); /* Stronger blur */
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn 0.2s ease-out;
}

.modal-content {
  background-color: var(--bg-primary);
  width: 90%;
  max-width: 500px;
  max-height: 90vh; /* Keep within viewport */
  display: flex;
  flex-direction: column;
  border-radius: 20px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  overflow: hidden;
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-primary);
  flex-shrink: 0; /* Header stays at the top */
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.close-modal {
  background: transparent;
  border: none;
  color: #9ca3af;
  cursor: pointer;
  padding: 4px;
  font-size: 18px;
  display: flex;
  transition: color 0.2s;
}

.close-modal:hover {
  color: #374151;
}

.modal-body {
  padding: 24px;
  overflow-y: auto; /* Contents scrollable */
  flex: 1;
}

.modal-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.5;
}

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.source-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background-color: var(--bg-secondary);
  border-radius: 12px;
  transition: background-color 0.2s;
  border: 1px solid var(--border-color);
}

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

.source-icon {
  font-size: 16px;
  flex-shrink: 0;
}

.source-icon.pdf { color: #ef4444; }
.source-icon.word { color: #3b82f6; }
.source-icon.db { color: #10b981; }

.source-name {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
  line-height: 1.4;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}