:root{--primary: #0f63b8;--primary-deep: #0a4c8f;--primary-weak: #e2ecf7;--primary-text: #ffffff;--bg: #eaf0f5;--surface: #ffffff;--surface-2: #f4f7fa;--surface-3: #e0e7ee;--text: #12202e;--text-2: #3a4a5c;--text-3: #57657a;--border: #ccd6e0;--border-strong: #aebbc9;--danger: #d6455b;--danger-weak: #fbe7ea;--success: #1c7d5a;--radius: 14px;--radius-sm: 10px;--shadow-sm: 0 1px 2px rgba(10, 51, 85, .06), 0 6px 18px -10px rgba(10, 51, 85, .14);--shadow-md: 0 12px 32px -18px rgba(10, 51, 85, .3);--ease: cubic-bezier(.16, 1, .3, 1);--maxw: 860px;--font: "Noto Sans SC", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;--font-serif: "Noto Serif SC", Georgia, "Songti SC", serif;--font-mono: "Spline Sans Mono", ui-monospace, Menlo, monospace}[data-theme=dark]{--primary: #2f86d8;--primary-deep: #2f7fd0;--primary-weak: #14324f;--primary-text: #ffffff;--bg: #081320;--surface: #0e1f31;--surface-2: #122a40;--surface-3: #16304a;--text: #eaf0f5;--text-2: #aecbe6;--text-3: #8fb2d4;--border: #1d4f77;--border-strong: #2a5f8a;--danger: #f2607c;--danger-weak: #2a1620;--success: #34d399;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4), 0 6px 18px -10px rgba(0, 0, 0, .5);--shadow-md: 0 12px 32px -18px rgba(0, 0, 0, .6)}*{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 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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 .conv-actions{display:flex}.icon-btn{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;color:var(--text-2)}.icon-btn:hover{background:var(--surface-3);color:var(--text)}.sidebar-nav{border-top:1px solid var(--border);padding:8px 10px;display:flex;flex-direction:column;gap:2px}.nav-item{display:flex;align-items:center;gap:10px;padding:9px 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