#chat{flex:1;overflow-y:auto;padding:20px;scroll-behavior:smooth;background:#fafafa;margin-bottom:0;padding-bottom:0;min-height:0}
#chat::-webkit-scrollbar{width:8px}
#chat::-webkit-scrollbar-track{background:#f1f1f1}
#chat::-webkit-scrollbar-thumb{background:#888;border-radius:4px}
#chat::-webkit-scrollbar-thumb:hover{background:#555}
#status{text-align:center;padding:0;color:#667eea;font-size:16px;min-height:0;background:#fff;font-weight:500;display:none;max-font-size:18px}
#status:not(:empty){display:block;padding:4px 12px}
.message{margin-bottom:28px;padding:18px 24px;border-radius:16px;max-width:80%;animation:fadeIn 0.3s;word-wrap:break-word;position:relative;overflow:visible;min-height:40px}
.message-content{display:block;width:100%;padding-right:48px;padding-bottom:0;word-break:break-word;overflow-wrap:break-word}
.message .copy-btn{position:absolute;bottom:12px;right:12px;background:rgba(255,255,255,0.75);border:1px solid rgba(0,0,0,0.15);width:32px;height:32px;min-width:32px;min-height:32px;padding:0;border-radius:6px;cursor:pointer;font-size:16px;opacity:0;transition:all 0.3s;z-index:10;display:flex;align-items:center;justify-content:center;flex-shrink:0;backdrop-filter:blur(4px)}
.message:hover .copy-btn{opacity:1}
.message .copy-btn:hover{background:rgba(255,255,255,0.95);border-color:rgba(0,0,0,0.25);transform:scale(1.05)}
.copy-notification{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:rgba(0,0,0,0.8);color:white;padding:15px 30px;border-radius:8px;font-size:16px;z-index:1000;animation:fadeInOut 2s}
.message-time{position:absolute;bottom:-20px;left:4px;font-size:0.7em;opacity:0.5;font-weight:normal;color:#666;white-space:nowrap}
.user .message-time{left:auto;right:4px;color:#888}
.message h1,.message h2,.message h3{margin-top:0.8em;margin-bottom:0.5em}
.message h1:first-child,.message h2:first-child,.message h3:first-child{margin-top:0}
.message p{margin-bottom:0.5em;margin-top:0}
.message p:first-child{margin-top:0}
.message ul,.message ol{margin-left:1.5em;margin-bottom:0.5em;margin-top:0}
.message ul:first-child,.message ol:first-child{margin-top:0}
.message code{background:#f0f0f0;padding:0.1em 0.3em;border-radius:3px;font-family:monospace}
.message pre{background:#f0f0f0;padding:0.8em;border-radius:5px;overflow-x:auto;margin-bottom:0.5em}
.user{background:linear-gradient(135deg,#667eea,#764ba2);margin-left:auto;text-align:left;color:#fff;border-bottom-right-radius:4px;box-shadow:0 2px 5px rgba(102,126,234,0.3)}
.user .copy-btn{background:rgba(255,255,255,0.25);border:1px solid rgba(255,255,255,0.4);color:#fff}
.user .copy-btn:hover{background:rgba(255,255,255,0.4);border-color:rgba(255,255,255,0.6)}
.isis{background:#fff;border:1px solid #e0e0e0;color:#333;border-bottom-left-radius:4px;box-shadow:0 2px 4px rgba(0,0,0,0.05)}
.system{background:#fff3cd;border-left:3px solid #ff9800;color:#856404;font-style:italic}