*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0f0f13;--surface: #1a1a24;--border: #2a2a38;--accent: #c084fc;--accent-soft: #a855f720;--user-bg: #6d28d9;--text: #e8e8f0;--text-muted: #6b6b8a;--radius: 18px}body{background:var(--bg);color:var(--text);font-family:PingFang SC,Hiragino Sans GB,system-ui,sans-serif;height:100dvh;display:flex;align-items:center;justify-content:center}.app-shell{width:100%;max-width:480px;height:100dvh;display:flex;flex-direction:column}.chat-panel{display:flex;flex-direction:column;height:100%;background:var(--surface);border-left:1px solid var(--border);border-right:1px solid var(--border)}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.brand{display:flex;align-items:center;gap:10px;color:var(--accent)}.brand h1{font-size:17px;font-weight:600;color:var(--text)}.brand p{font-size:11px;color:var(--text-muted);margin-top:1px}.model-tag{font-size:11px;color:var(--accent)}.icon-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:6px;border-radius:8px;transition:color .2s}.icon-btn:hover{color:var(--text)}.messages{flex:1;overflow-y:auto;padding:20px 16px;display:flex;flex-direction:column;gap:12px;scroll-behavior:smooth}.message-row{display:flex}.message-row.user{justify-content:flex-end}.message-row.assistant{justify-content:flex-start}.bubble{max-width:78%;padding:12px 16px;border-radius:var(--radius);line-height:1.6;font-size:15px;position:relative}.message-row.user .bubble{background:var(--user-bg);color:#fff;border-bottom-right-radius:4px}.message-row.assistant .bubble{background:var(--border);color:var(--text);border-bottom-left-radius:4px}.ts{display:block;font-size:10px;color:var(--text-muted);margin-top:4px;text-align:right}.typing{display:flex;gap:5px;align-items:center;padding:14px 18px}.typing span{width:7px;height:7px;background:var(--accent);border-radius:50%;animation:bounce 1.2s infinite}.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:translateY(0);opacity:.4}40%{transform:translateY(-6px);opacity:1}}.composer{display:flex;gap:8px;padding:14px 16px;border-top:1px solid var(--border)}.composer input{flex:1;background:var(--bg);border:1px solid var(--border);border-radius:24px;padding:10px 18px;color:var(--text);font-size:15px;outline:none;transition:border-color .2s}.composer input:focus{border-color:var(--accent)}.composer input::placeholder{color:var(--text-muted)}}.composer button{width:44px;height:44px;background:var(--accent);border:none;border-radius:50%;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:opacity .2s;flex-shrink:0}.composer button:disabled{opacity:.4;cursor:not-allowed}.composer button:not(:disabled):hover{opacity:.85}