:root{--primary:#4a90d9;--primary-light:#7ec8e3;--primary-dark:#357abd;--primary-bg:#ebf2fa;--primary-border:#e1edf7;--success:#34d399;--warning:#f59e0b;--danger:#ef4444;--bg:#f5f7fa;--bg-white:#fff;--text:#2d3436;--text-secondary:#8a9199;--text-muted:#bfc6cc;--border:#e5e7eb;--shadow:0 2px 12px #0000000d;--shadow-lg:0 4px 24px #4a90d91f;--radius:12px;--radius-lg:16px;--sidebar-width:280px;--header-height:56px;--mobile-nav-height:64px}*{box-sizing:border-box;margin:0;padding:0}html,body,#app{width:100%;height:100%;overflow:hidden}body{color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.6}a{color:var(--primary);text-decoration:none}button{cursor:pointer;font:inherit;background:0 0;border:none}input,textarea,select{font:inherit}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--text-muted);border-radius:3px}.app-layout{height:100vh;display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);background:var(--bg-white);border-right:1px solid var(--border);z-index:40;flex-direction:column;flex-shrink:0;transition:transform .3s;display:flex}.sidebar-header{border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:16px;display:flex}.sidebar-header .logo{background:linear-gradient(135deg, var(--primary), var(--primary-light));border-radius:10px;justify-content:center;align-items:center;width:36px;height:36px;font-size:20px;display:flex}.sidebar-header h1{color:var(--text);font-size:16px;font-weight:700}.sidebar-header .tag{background:var(--primary-bg);color:var(--primary);border-radius:4px;margin-left:auto;padding:2px 6px;font-size:10px}.sidebar-nav{flex-direction:column;gap:2px;padding:8px;display:flex}.nav-link{color:var(--text-secondary);border-radius:8px;align-items:center;gap:10px;padding:10px 12px;font-size:14px;transition:all .15s;display:flex}.nav-link:hover{background:var(--bg);color:var(--text)}.nav-link.router-link-exact-active{background:var(--primary-bg);color:var(--primary);font-weight:600}.nav-link .icon{text-align:center;width:22px;font-size:18px}.sidebar-section-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;padding:16px 12px 6px;font-size:11px;font-weight:600}.conv-list{flex:1;padding:4px 8px;overflow-y:auto}.conv-item{color:var(--text-secondary);cursor:pointer;white-space:nowrap;text-overflow:ellipsis;border-radius:8px;padding:10px 12px;font-size:13px;transition:all .15s;overflow:hidden}.conv-item:hover{background:var(--bg);color:var(--text)}.conv-item.active{background:var(--primary-bg);color:var(--primary)}.new-chat-btn{background:var(--primary);color:#fff;text-align:center;border-radius:8px;margin:8px;padding:10px;font-size:13px;font-weight:600;transition:opacity .15s}.new-chat-btn:hover{opacity:.9}.main-content{flex-direction:column;flex:1;min-width:0;display:flex;overflow:hidden}.top-bar{height:var(--header-height);border-bottom:1px solid var(--border);background:var(--bg-white);flex-shrink:0;align-items:center;gap:12px;padding:0 16px;display:flex}.top-bar .menu-toggle{color:var(--text);padding:4px;font-size:20px;display:none}.top-bar .page-title{font-size:16px;font-weight:600}.top-bar .spacer{flex:1}.top-bar .connection-status{color:var(--text-secondary);align-items:center;gap:6px;font-size:12px;display:flex}.top-bar .status-dot{background:var(--success);border-radius:50%;width:8px;height:8px}.page-container{flex:1;overflow:hidden auto}.card{background:var(--bg-white);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}.card-header{border-bottom:1px solid var(--border);align-items:center;gap:8px;padding:16px 20px;display:flex}.card-header .card-icon{font-size:20px}.card-header h3{font-size:15px;font-weight:600}.card-body{padding:20px}.btn{border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:8px 16px;font-size:13px;font-weight:500;transition:all .15s;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--primary-light));color:#fff}.btn-primary:hover{opacity:.9}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-outline{border:1px solid var(--border);color:var(--text-secondary);background:var(--bg-white)}.btn-outline:hover{border-color:var(--primary);color:var(--primary)}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:6px 12px;font-size:12px}.btn-block{width:100%}.form-group{margin-bottom:16px}.form-group label{color:var(--text-secondary);margin-bottom:6px;font-size:13px;font-weight:500;display:block}.form-input,.form-select{border:1px solid var(--border);width:100%;color:var(--text);background:var(--bg-white);border-radius:8px;padding:10px 12px;font-size:14px;transition:border-color .15s}.form-input:focus,.form-select:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px #4a90d91a}.empty-state{text-align:center;color:var(--text-secondary);padding:40px 20px}.empty-state .empty-icon{margin-bottom:12px;font-size:48px}.empty-state p{font-size:14px}.sidebar-overlay{z-index:35;background:#0006;display:none;position:fixed;inset:0}.mobile-nav{height:var(--mobile-nav-height);background:var(--bg-white);border-top:1px solid var(--border);z-index:30;padding-bottom:env(safe-area-inset-bottom);display:none;position:fixed;bottom:0;left:0;right:0}.mobile-nav-inner{height:100%;display:flex}.mobile-nav a{color:var(--text-secondary);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:2px;font-size:10px;transition:color .15s;display:flex}.mobile-nav a.router-link-exact-active{color:var(--primary);font-weight:600}.mobile-nav a .icon{font-size:22px}@media (width<=768px){.sidebar{position:fixed;top:0;bottom:0;left:0;transform:translate(-100%)}.sidebar.open{transform:translate(0)}.sidebar-overlay.open,.top-bar .menu-toggle,.mobile-nav{display:block}.main-content{padding-bottom:var(--mobile-nav-height)}}