: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;--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 .3s,color .3s}.app-container{display:flex;justify-content:center;align-items:center;height:100vh;width:100%}.chat-container{width:100%;max-width:800px;height:100vh;background-color:var(--chat-bg);display:flex;flex-direction:column;box-shadow:0 4px 12px #0000001a;position:relative}.chat-header{padding:1rem;background-color:var(--tesco-blue);color:#fff;display:flex;align-items:center;gap:1rem;box-shadow:0 2px 4px #0000001a}.logo-area{background:transparent;padding:0}.logo-text{font-weight:800;font-size:1.5rem;color:var(--tesco-red);letter-spacing:.5px;text-shadow:1px 1px 0px white;background:#fff;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:.8rem;opacity:.9}.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:.95rem;animation:fadeIn .3s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}.markdown-body{font-size:.95rem;line-height:1.5}.markdown-body p{margin:0 0 10px}.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;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}.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{padding:1rem;border-top:1px solid var(--border-color);background-color:var(--chat-bg);display:flex;gap:.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 .2s}.input-field:focus{border-color:var(--tesco-blue)}.send-button{background-color:var(--tesco-blue);color:#fff;border:none;width:48px;height:48px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s}.send-button:disabled{background-color:#ccc;cursor:not-allowed}.send-button:hover:not(:disabled){background-color:var(--tesco-blue-dark)}.typing-indicator{display:flex;gap:4px;padding:8px 12px;background-color:var(--bot-msg-bg);border-radius:12px 12px 12px 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:-.32s}.dot:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#ccc;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#aaa}