:root{--blue: #2563eb;--blue-light: #dbeafe;--teal: #0d9488;--red: #dc2626;--orange: #f59e0b;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-500: #6b7280;--gray-700: #374151;--gray-900: #111827;--radius: 8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Helvetica Neue,sans-serif;background:var(--gray-50);color:var(--gray-900)}button{cursor:pointer;border:none;border-radius:var(--radius);font-size:14px;padding:8px 16px;transition:opacity .15s}button:hover{opacity:.85}button:disabled{opacity:.5;cursor:not-allowed}input,select{border:1px solid var(--gray-300);border-radius:var(--radius);padding:8px 12px;font-size:14px;outline:none;transition:border-color .15s}input:focus,select:focus{border-color:var(--blue)}.btn-primary{background:var(--blue);color:#fff}.btn-danger{background:var(--red);color:#fff}.btn-outline{background:#fff;border:1px solid var(--gray-300);color:var(--gray-700)}.loading-screen{display:flex;align-items:center;justify-content:center;height:100vh;font-size:16px;color:var(--gray-500)}.auth-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#2563eb,#0d9488)}.auth-card{background:#fff;border-radius:12px;padding:40px;width:360px;box-shadow:0 20px 60px #00000026}.auth-card h1{font-size:24px;margin-bottom:8px;color:var(--gray-900)}.auth-card p{color:var(--gray-500);margin-bottom:24px;font-size:14px}.auth-card .field{margin-bottom:16px}.auth-card label{display:block;font-size:13px;color:var(--gray-700);margin-bottom:6px;font-weight:500}.auth-card input{width:100%}.auth-card button{width:100%;padding:10px;font-size:15px;font-weight:600}.auth-card .switch-link{text-align:center;margin-top:16px;font-size:13px;color:var(--gray-500)}.auth-card .switch-link a{color:var(--blue);cursor:pointer;text-decoration:none}.auth-card .error{background:#fee2e2;color:var(--red);padding:8px 12px;border-radius:var(--radius);font-size:13px;margin-bottom:16px}.role-toggle{display:flex;gap:8px;margin-bottom:16px}.role-toggle button{flex:1;padding:8px;font-size:13px;background:var(--gray-100);color:var(--gray-700)}.role-toggle button.active{background:var(--blue);color:#fff}.home-layout{display:flex;height:100vh}.sidebar{width:280px;background:#fff;border-right:1px solid var(--gray-200);display:flex;flex-direction:column}.sidebar-header{padding:16px;border-bottom:1px solid var(--gray-200);display:flex;align-items:center;justify-content:space-between}.sidebar-header h2{font-size:18px}.sidebar-header button{font-size:12px;padding:4px 10px}.children-list{flex:1;overflow-y:auto}.child-item{padding:12px 16px;border-bottom:1px solid var(--gray-100);cursor:pointer;transition:background .1s}.child-item:hover{background:var(--gray-50)}.child-item.active{background:var(--blue-light);border-left:3px solid var(--blue)}.child-item .name{font-size:14px;font-weight:600}.child-item .meta{font-size:12px;color:var(--gray-500);margin-top:4px}.bind-section{padding:12px 16px;border-top:1px solid var(--gray-200)}.bind-section input{width:100%;margin-bottom:8px}.main-area{flex:1;display:flex;flex-direction:column}.topbar{padding:10px 16px;background:#fff;border-bottom:1px solid var(--gray-200);display:flex;align-items:center;justify-content:space-between}.topbar .child-info{font-size:14px}.topbar .child-info strong{font-size:16px}.tabs{display:flex;gap:0;background:#fff;border-bottom:1px solid var(--gray-200)}.tabs button{flex:1;padding:10px;background:none;color:var(--gray-500);border-radius:0;border-bottom:2px solid transparent;font-size:13px;font-weight:500}.tabs button.active{color:var(--blue);border-bottom-color:var(--blue)}.tab-content{flex:1;display:flex;flex-direction:column}.map-wrap{flex:1;position:relative}#map-container{width:100%;height:100%}.no-child-selected{flex:1;display:flex;align-items:center;justify-content:center;color:var(--gray-500);font-size:15px}.trajectory-controls{padding:10px 16px;background:#fff;border-bottom:1px solid var(--gray-200);display:flex;align-items:center;gap:10px}.trajectory-controls input[type=date]{font-size:13px}.trajectory-controls .stats{font-size:12px;color:var(--gray-500);margin-left:auto}.fence-panel{padding:16px;overflow-y:auto;max-height:calc(100vh - 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