:root{--primary: #4f46e5;--primary-weak: #eef0ff;--primary-text: #ffffff;--bg: #f6f7fb;--surface: #ffffff;--surface-2: #f1f3f9;--surface-3: #e9ecf4;--text: #151a2d;--text-2: #5b6276;--text-3: #8a90a6;--border: #e6e8ef;--danger: #e11d48;--danger-weak: #fff0f3;--success: #16a34a;--radius: 14px;--radius-sm: 10px;--shadow-sm: 0 1px 2px rgba(20, 24, 40, .06), 0 4px 14px rgba(20, 24, 40, .04);--shadow-md: 0 6px 24px rgba(20, 24, 40, .1);--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;--maxw: 860px}[data-theme=dark]{--primary: #6366f1;--primary-weak: #1c2140;--primary-text: #ffffff;--bg: #0f1117;--surface: #171a23;--surface-2: #1f2430;--surface-3: #262c3a;--text: #e7e9f0;--text-2: #a3abc0;--text-3: #6b7282;--border: #2a2f3d;--danger: #f43f5e;--danger-weak: #2a1620;--success: #34d399;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 14px rgba(0, 0, 0, .25);--shadow-md: 0 6px 24px rgba(0, 0, 0, .4)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}input,textarea,select{font-family:inherit;color:inherit}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-thumb{background:var(--surface-3);border-radius:8px;border:2px solid transparent;background-clip:content-box}::-webkit-scrollbar-thumb:hover{background:var(--text-3);background-clip:content-box}.app-shell{display:flex;height:100vh;height:100dvh;overflow:hidden}.sidebar{width:280px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;transition:transform .22s ease}.sidebar-header{padding:18px 16px 12px;display:flex;align-items:center;gap:10px}.brand-logo{width:34px;height:34px;border-radius:10px;background:var(--primary);color:var(--primary-text);display:grid;place-items:center;flex-shrink:0}.brand-name{font-weight:700;font-size:15px;letter-spacing:.2px}.brand-sub{font-size:11px;color:var(--text-3)}.sidebar-section-label{font-size:11px;color:var(--text-3);padding:14px 18px 6px;text-transform:none;letter-spacing:.3px}.conv-list{flex:1;overflow-y:auto;padding:4px 10px}.conv-item{display:flex;align-items:center;gap:8px;padding:9px 10px;border-radius:var(--radius-sm);color:var(--text-2);font-size:13.5px;cursor:pointer;white-space:nowrap;overflow:hidden}.conv-item:hover{background:var(--surface-2)}.conv-item.active{background:var(--primary-weak);color:var(--text);font-weight:600}.conv-item .conv-title{flex:1;overflow:hidden;text-overflow:ellipsis}.conv-item .conv-pin{color:var(--primary);flex-shrink:0}.conv-item .conv-actions{display:none;gap:2px;flex-shrink:0}.conv-item:hover 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