:root{--bg-color: linear-gradient(135deg, #a8edea, #fed6e3);--chat-bg: rgba(255, 255, 255, .85);--header-bg: #ff7eb3;--header-text: #fff;--text-color: #222;--bubble-user: #8e44ad;--bubble-bot: #3498db;--bubble-glow: rgba(255, 255, 255, .3)}body.dark{--bg-color: linear-gradient(135deg, #1e293b, #0f172a);--chat-bg: rgba(17, 24, 39, .9);--header-bg: #6366f1;--header-text: #e0e7ff;--text-color: #f3f4f6;--bubble-user: #7c3aed;--bubble-bot: #2563eb;--bubble-glow: rgba(99, 102, 241, .4)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Poppins,sans-serif;background:var(--bg-color);color:var(--text-color);transition:background .5s ease,color .4s ease;height:100vh;display:flex;justify-content:center;align-items:center}.chat-wrapper{width:100%;max-width:850px;height:85vh;background:var(--chat-bg);border-radius:20px;display:flex;flex-direction:column;box-shadow:0 8px 24px #0000004d;overflow:hidden;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);animation:popIn .6s ease forwards}@keyframes popIn{0%{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.chat-header{background-color:var(--header-bg);color:var(--header-text);padding:16px 20px;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1.1rem}.toggle-btn{background:transparent;border:2px solid var(--header-text);color:var(--header-text);border-radius:8px;padding:5px 10px;cursor:pointer;transition:all .3s ease}.toggle-btn:hover{background:var(--header-text);color:var(--header-bg)}.chat-window{flex-grow:1;padding:20px;overflow-y:auto;scroll-behavior:smooth}.message{display:flex;align-items:flex-start;margin-bottom:16px;max-width:80%;animation:fadeIn .5s ease}.message.user{justify-content:flex-end;margin-left:auto}.message-icon{background:#fff;border-radius:50%;padding:6px;margin-right:8px;display:flex;align-items:center;justify-content:center;box-shadow:0 0 10px var(--bubble-glow)}.message.user .message-icon{order:2;margin-right:0;margin-left:8px}.message-bubble{background:var(--bubble-bot);border-radius:16px;padding:12px 16px;color:#fff;line-height:1.5;box-shadow:0 0 12px var(--bubble-glow);transition:transform .2s}.message.user .message-bubble{background:var(--bubble-user)}.message-bubble:hover{transform:scale(1.03)}.loading{background:var(--bubble-bot);padding:12px 16px;border-radius:16px;color:#fff;font-size:.9rem;animation:pulse 1.2s infinite}@keyframes pulse{0%{opacity:.5}50%{opacity:1}to{opacity:.5}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.input-bar{padding:16px;background:var(--chat-bg);border-top:2px solid rgba(255,255,255,.15);display:flex;align-items:center}.input-bar textarea{flex-grow:1;resize:none;border:none;border-radius:12px;padding:12px 14px;font-size:1rem;outline:none;background:#fffc;color:var(--text-color);transition:background .3s ease}body.dark .input-bar textarea{background:#1e293bcc;color:#f3f4f6}.input-bar button{margin-left:10px;background:var(--header-bg);border:none;color:#fff;border-radius:12px;width:48px;height:48px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease}.input-bar button:hover{transform:scale(1.05);background:#ff89c0}.chat-window::-webkit-scrollbar{width:8px}.chat-window::-webkit-scrollbar-thumb{background-color:#0003;border-radius:4px}