:root{--primary: #C8102E;--primary-hover: #a80d24;--bg: #eef1f5;--white: #ffffff;--gray-1: #f8f9fa;--gray-2: #e9ecef;--border: #dee2e6;--text: #212529;--text-muted: #6c757d;--radius: 16px;--shadow: 0 4px 32px rgba(0, 0, 0, .09)}*{box-sizing:border-box;margin:0;padding:0}button{-webkit-tap-highlight-color:transparent;touch-action:manipulation}body{font-family:Inter,sans-serif;background:var(--bg);color:var(--text);height:100vh;height:100dvh}.app{height:100vh;height:100dvh;display:flex;justify-content:center;background:var(--bg)}.chat-card{width:100%;max-width:780px;height:100vh;height:100dvh;background:var(--white);display:flex;flex-direction:column;box-shadow:var(--shadow);overflow:hidden}.header{padding:14px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-shrink:0;background:var(--white)}.header-brand{display:flex;align-items:center;gap:12px}.header-logo{width:38px;height:38px;background:var(--primary);color:var(--white);border-radius:9px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:12px;letter-spacing:-.3px;flex-shrink:0}.header-title{font-size:15px;font-weight:700;color:var(--text);line-height:1.2}.header-sub{font-size:12px;color:var(--text-muted);line-height:1.2}.clear-btn{padding:6px 14px;border:1.5px solid var(--border);background:none;border-radius:20px;font-size:12px;font-family:inherit;color:var(--text-muted);cursor:pointer;transition:all .15s}.clear-btn:hover{border-color:var(--primary);color:var(--primary)}.messages{flex:1;overflow-y:auto;padding:28px 24px 16px;display:flex;flex-direction:column;gap:18px;scroll-behavior:smooth}.messages::-webkit-scrollbar{width:5px}.messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.message{display:flex;gap:10px;max-width:86%;animation:fadeUp .18s ease}@keyframes fadeUp{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.message.user{align-self:flex-end;flex-direction:row-reverse}.message.assistant{align-self:flex-start}.avatar{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:700;flex-shrink:0;margin-top:3px}.message.user .avatar{background:var(--primary);color:var(--white)}.message.assistant .avatar{background:var(--gray-2);color:var(--primary);font-size:11px}.bubble-wrap{display:flex;flex-direction:column;gap:5px}.bubble{padding:11px 15px;border-radius:16px;font-size:14px;line-height:1.65;word-break:break-word}.message.user .bubble{background:var(--primary);color:var(--white);border-bottom-right-radius:4px}.message.assistant .bubble{background:var(--gray-1);border:1px solid var(--border);color:var(--text);border-bottom-left-radius:4px}.message.assistant .bubble p{margin-bottom:8px}.message.assistant .bubble p:last-child{margin-bottom:0}.message.assistant .bubble ul,.message.assistant .bubble ol{padding-left:18px;margin-bottom:8px}.message.assistant .bubble li{margin-bottom:3px}.message.assistant .bubble strong{font-weight:600}.message.assistant .bubble code{background:var(--gray-2);padding:1px 5px;border-radius:4px;font-size:13px}.sources{display:flex;flex-wrap:wrap;gap:4px}.source-tag{font-size:11px;padding:2px 9px;border-radius:10px;border:1px solid var(--border);color:var(--text-muted);background:var(--white)}.typing{display:flex;gap:10px;align-self:flex-start;animation:fadeUp .18s ease}.typing-bubble{padding:13px 16px;background:var(--gray-1);border:1px solid var(--border);border-radius:16px 16px 16px 4px;display:flex;gap:5px;align-items:center}.dot{width:7px;height:7px;border-radius:50%;background:#bbb;animation:bounce 1.3s infinite}.dot:nth-child(2){animation-delay:.2s}.dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,60%,to{transform:translateY(0);opacity:.6}30%{transform:translateY(-6px);opacity:1}}.suggestions{padding:10px 24px;border-top:1px solid var(--border);display:flex;gap:7px;overflow-x:auto;flex-shrink:0;scrollbar-width:none}.suggestions::-webkit-scrollbar{display:none}.chip{white-space:nowrap;padding:6px 14px;border:1.5px solid var(--border);background:none;color:var(--text);border-radius:20px;font-size:13px;font-family:inherit;cursor:pointer;flex-shrink:0;transition:all .15s}.chip:hover:not(:disabled){border-color:var(--primary);color:var(--primary);background:#fff5f6}.chip:disabled{opacity:.4;cursor:not-allowed}.input-area{padding:14px 24px;border-top:1px solid var(--border);display:flex;gap:10px;flex-shrink:0;background:var(--white)}.input-field{flex:1;padding:11px 18px;border:1.5px solid var(--border);border-radius:24px;font-size:14px;font-family:inherit;color:var(--text);background:var(--gray-1);outline:none;transition:all .15s}.input-field:focus{border-color:var(--primary);background:var(--white)}.input-field::placeholder{color:#adb5bd}.input-field:disabled{opacity:.5}.send-btn{padding:11px 26px;background:var(--primary);color:var(--white);border:none;border-radius:24px;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;white-space:nowrap;transition:background .15s}.send-btn:hover:not(:disabled){background:var(--primary-hover)}.send-btn:disabled{opacity:.45;cursor:not-allowed}.typing-cursor{display:inline-block;font-size:13px;line-height:1;vertical-align:text-bottom;margin-left:1px;animation:blink .75s step-end infinite;color:var(--primary)}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}@media (max-width: 800px){.app{padding:0}.chat-card{box-shadow:none;border-radius:0}.message{max-width:93%}.messages{padding:20px 16px 12px}.input-area{padding-left:16px;padding-right:16px;padding-bottom:calc(14px + env(safe-area-inset-bottom,0px))}.suggestions{padding-left:16px;padding-right:16px}.header{padding:12px 16px}.send-btn{padding:11px 18px}}@media (max-width: 380px){.header-title{font-size:14px}.bubble,.input-field{font-size:13px}.send-btn{padding:11px 14px;font-size:13px}}