:root{--uni-blue:#036;--uni-light-blue:#e6f0ff;--uni-accent:#fc0;--bg-gray:#f5f7f9;--text-dark:#2c3e50;--text-muted:#7f8c8d;--white:#fff;--shadow:0 4px 12px #0000001a}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-gray);color:var(--text-dark);justify-content:center;align-items:center;height:100vh;font-family:Pretendard,-apple-system,BlinkMacSystemFont,system-ui,Roboto,sans-serif;display:flex}.chat-app{background:var(--white);width:100%;max-width:480px;height:100vh;max-height:800px;box-shadow:var(--shadow);flex-direction:column;display:flex;position:relative}header{background-color:var(--uni-blue);color:#fff;z-index:10;align-items:center;gap:1rem;padding:1.2rem;display:flex}.bot-avatar{background:#fff;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;font-size:1.5rem;display:flex}.header-info h1{font-size:1.1rem;font-weight:700}.header-info span{opacity:.8;font-size:.75rem}.chat-body{background-color:var(--bg-gray);flex-direction:column;flex:1;gap:1.2rem;padding:1.5rem;display:flex;overflow-y:auto}.message-wrapper{flex-direction:column;display:flex}.message{max-width:85%;padding:.8rem 1rem;font-size:.95rem;line-height:1.4;position:relative}.message.bot{background-color:var(--white);color:var(--text-dark);border-radius:0 16px 16px;align-self:flex-start;box-shadow:0 2px 4px #0000000d}.message.user{background-color:var(--uni-blue);color:var(--white);border-radius:16px 0 16px 16px;align-self:flex-end}.time{color:var(--text-muted);margin-top:.4rem;font-size:.7rem}.message.user .time{text-align:right;color:#ffffffb3}.typing{color:var(--text-muted);margin-left:.5rem;font-size:.8rem;font-style:italic}.quick-replies{background:var(--bg-gray);gap:.5rem;padding:.8rem 1.2rem;display:flex;overflow-x:auto}.quick-btn{cursor:pointer;white-space:nowrap;background:#fff;border:1px solid #ddd;border-radius:20px;padding:.5rem 1rem;font-size:.85rem;transition:all .2s}.quick-btn:hover{border-color:var(--uni-blue);color:var(--uni-blue)}footer{background:#fff;border-top:1px solid #eee;gap:.5rem;padding:1rem;display:flex}.input-container{background:#f0f2f5;border-radius:24px;flex:1;align-items:center;padding:.2rem 1rem;display:flex}input{background:0 0;border:none;outline:none;flex:1;padding:.6rem 0;font-size:.95rem}.send-btn{background:var(--uni-blue);color:#fff;cursor:pointer;border:none;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;transition:opacity .2s;display:flex}.send-btn:hover{opacity:.9}@media (width<=480px){.chat-app{height:100vh;max-height:none}}