frontend/src/index.css

:root {
  --tesco-blue: #00539F;
  --tesco-blue-dark: #003e7e;
  --tesco-red: #EE1C2E;
  --bg-color: #f4f5f7;
  --text-color: #333;
  --chat-bg: #ffffff;
  --user-msg-bg: #00539F;
  --user-msg-text: #ffffff;
  --bot-msg-bg: #f3f3f3;
  --bot-msg-text: #333;
  --input-bg: #ffffff;
  --border-color: #e5e5e5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --chat-bg: #2d2d2d;
    --user-msg-bg: #00539F;
    /* Keep brand color */
    --user-msg-text: #ffffff;
    --bot-msg-bg: #3d3d3d;
    --bot-msg-text: #ffffff;
    --input-bg: #2d2d2d;
    --border-color: #444;
  }
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s, color 0.3s;
}

.app-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  width: 100%;
}

/* Chat Interface */
.chat-container {
  width: 100%;
  max-width: 800px;
  height: 100vh;
  /* Full height for mobile feel */
  background-color: var(--chat-bg);
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  position: relative;
}

/* Header */
.chat-header {
  padding: 1rem;
  background-color: var(--tesco-blue);
  color: white;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.logo-area {
  background: transparent;
  padding: 0;
}

.logo-text {
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--tesco-red);
  letter-spacing: 0.5px;
  text-shadow: 1px 1px 0px white;
  /* Simple Tesco-like text representation */
  background: white;
  padding: 2px 6px;
  border-radius: 2px;
}

.header-title h1 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
}

.header-title p {
  margin: 0;
  font-size: 0.8rem;
  opacity: 0.9;
}

/* Messages Area */
.messages-area {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scroll-behavior: smooth;
}

.message {
  max-width: 80%;
  padding: 10px 16px;
  border-radius: 12px;
  line-height: 1.5;
  font-size: 0.95rem;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(5px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* Message Rendering - Markdown Support */
.markdown-body {
  font-size: 0.95rem;
  line-height: 1.5;
}

.markdown-body p {
  margin: 0 0 10px 0;
}

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

.markdown-body ul,
.markdown-body ol {
  margin: 8px 0;
  padding-left: 20px;
}

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

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  font-weight: 600;
  margin: 12px 0 8px 0;
  font-size: 1.1em;
}

.markdown-body h1:first-child,
.markdown-body h2:first-child {
  margin-top: 0;
}

.markdown-body strong {
  font-weight: 600;
}

.markdown-body a {
  color: var(--tesco-blue);
  text-decoration: underline;
}

/* User Message specific overrides */
.message.user {
  align-self: flex-end;
  background-color: var(--user-msg-bg);
  color: var(--user-msg-text);
  border-bottom-right-radius: 2px;
}

.message.assistant {
  align-self: flex-start;
  background-color: var(--bot-msg-bg);
  color: var(--bot-msg-text);
  border-bottom-left-radius: 2px;
}

.message.assistant .markdown-body {
  color: var(--bot-msg-text);
}

/* Input Area */
.input-area {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  background-color: var(--chat-bg);
  display: flex;
  gap: 0.5rem;
}

.input-field {
  flex: 1;
  padding: 12px;
  border-radius: 24px;
  border: 1px solid var(--border-color);
  background-color: var(--input-bg);
  color: var(--text-color);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.input-field:focus {
  border-color: var(--tesco-blue);
}

.send-button {
  background-color: var(--tesco-blue);
  color: white;
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s;
}

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

.send-button:hover:not(:disabled) {
  background-color: var(--tesco-blue-dark);
}

/* Loading/Typing Indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 8px 12px;
  background-color: var(--bot-msg-bg);
  border-radius: 12px;
  border-bottom-left-radius: 2px;
  width: fit-content;
  align-self: flex-start;
}

.dot {
  width: 8px;
  height: 8px;
  background-color: #888;
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out both;
}

.dot:nth-child(1) {
  animation-delay: -0.32s;
}

.dot:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes bounce {

  0%,
  80%,
  100% {
    transform: scale(0);
  }

  40% {
    transform: scale(1);
  }
}

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

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #aaa;
}