*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#060610;--bg2:#0a0a18;--card:#111122;--border:#222244;--text:#f1f5f9;--text2:#94a3b8;--muted:#64748b;--primary:#06b6d4;--primary-light:#22d3ee;--accent:#8b5cf6;--success:#10b981;--glow:rgba(6,182,212,.15)}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);height:100vh;display:flex;flex-direction:column;overflow:hidden}
.bg-grid{position:fixed;inset:0;z-index:0;pointer-events:none;background-image:linear-gradient(rgba(6,182,212,.02) 1px,transparent 1px),linear-gradient(90deg,rgba(6,182,212,.02) 1px,transparent 1px);background-size:50px 50px}
.demo-banner{background:linear-gradient(135deg,rgba(6,182,212,.1),rgba(139,92,246,.1));border-bottom:1px solid rgba(6,182,212,.2);padding:8px 18px;text-align:center;color:var(--primary-light);font-size:12px;z-index:10}
.chat-header{padding:14px 24px;background:var(--card);border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;z-index:10}
.header-left{display:flex;align-items:center;gap:12px}
.header-icon{width:40px;height:40px;border-radius:8px;background:linear-gradient(135deg,#06b6d4,#0891b2);display:flex;align-items:center;justify-content:center;font-size:20px}
.header-title{font-size:16px;font-weight:700}.header-sub{font-size:11px;color:var(--muted)}
.status{padding:4px 12px;border-radius:20px;font-size:11px;font-weight:500;display:flex;align-items:center;gap:6px}
.status.online{background:rgba(16,185,129,.15);color:var(--success);border:1px solid rgba(16,185,129,.3)}
.dot{width:6px;height:6px;border-radius:50%;background:currentColor;animation:blink 2s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}
.chat-container{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px;z-index:1}
.welcome{text-align:center;padding:40px 20px;display:flex;flex-direction:column;align-items:center;gap:12px}
.welcome h2{font-size:22px;font-weight:700}.welcome p{color:var(--text2);max-width:400px;font-size:13px}
.quick-qs{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:8px}
.qq{padding:8px 16px;border-radius:20px;background:var(--card);border:1px solid var(--border);color:var(--text2);font-size:12px;cursor:pointer;transition:all .3s;font-family:inherit}
.qq:hover{border-color:var(--primary);color:var(--primary-light);background:var(--glow)}
.msg{display:flex;gap:12px;max-width:700px;animation:fadeUp .3s}
.msg.user{align-self:flex-end;flex-direction:row-reverse}
.msg.bot{align-self:flex-start}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.msg-avatar{width:34px;height:34px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.msg.user .msg-avatar{background:linear-gradient(135deg,#8b5cf6,#6d28d9)}
.msg.bot .msg-avatar{background:linear-gradient(135deg,#06b6d4,#0891b2)}
.msg-bubble{padding:12px 16px;border-radius:12px;font-size:13px;line-height:1.6}
.msg.user .msg-bubble{background:linear-gradient(135deg,#1e3a5f,#1a2744);border:1px solid rgba(30,58,95,.5);border-bottom-right-radius:4px}
.msg.bot .msg-bubble{background:#151528;border:1px solid var(--border);border-bottom-left-radius:4px}
.msg-meta{font-size:11px;color:var(--muted);margin-top:6px;display:flex;gap:8px}
.source-tag{font-size:11px;margin-top:8px;padding:4px 8px;background:rgba(6,182,212,.08);border-radius:6px;border-left:2px solid var(--primary);color:var(--text2);display:inline-block}
.typing{display:flex;gap:4px;padding:8px 0}.typing span{width:7px;height:7px;border-radius:50%;background:var(--primary);opacity:.4;animation:typing 1.4s infinite}
.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}
@keyframes typing{0%,60%,100%{opacity:.4;transform:translateY(0)}30%{opacity:1;transform:translateY(-4px)}}
.chat-input-area{padding:14px 24px;background:var(--card);border-top:1px solid var(--border);z-index:10}
.input-row{display:flex;gap:10px;max-width:700px;margin:0 auto}
textarea{flex:1;padding:12px 16px;background:var(--bg2);border:1px solid var(--border);border-radius:10px;color:var(--text);font-family:inherit;font-size:13px;outline:none;resize:none}
textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--glow)}
.send-btn{width:44px;height:44px;border-radius:10px;background:linear-gradient(135deg,#06b6d4,#0891b2);border:none;color:#fff;font-size:18px;cursor:pointer;transition:all .3s;display:flex;align-items:center;justify-content:center}
.send-btn:hover{transform:translateY(-2px)}
::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}