:root{--primary: #01458e;--primary-dark: #013269;--bg: #f5f6f8;--panel: #ffffff;--border: #e3e6eb;--text: #1f2430;--text-2: #6b7280;--hover: #eef3fa;--danger: #d93026;--ok: #21a053}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:PingFang SC,Microsoft YaHei,Segoe UI,sans-serif;color:var(--text);background:var(--bg)}.app{display:flex;height:100%}.sidebar{width:280px;flex:0 0 280px;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column}.sidebar .brand{padding:18px 16px 10px;border-bottom:1px solid var(--border)}.sidebar .brand-title{font-size:17px;font-weight:700;color:var(--primary);display:flex;align-items:center;gap:8px}.sidebar .update-line{font-size:12px;color:var(--text-2);margin-top:6px}.new-chat-btn{margin:12px 16px;padding:9px 12px;border:1px solid var(--primary);color:var(--primary);background:#fff;border-radius:8px;cursor:pointer;font-size:14px}.new-chat-btn:hover{background:var(--hover)}.main-head 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