*{box-sizing:border-box;margin:0;padding:0}:root{--primary:#4f46e5;--primary-light:#818cf8;--danger:#ef4444;--danger-light:#fca5a5;--success:#22c55e;--success-light:#86efac;--warning:#f59e0b;--warning-light:#fcd34d;--bg:#f8fafc;--card:#fff;--text:#1e293b;--text-secondary:#64748b;--border:#e2e8f0;--radius:10px;--shadow:0 1px 3px #00000014, 0 1px 2px #0000000f}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}#root{min-height:100vh}.app{max-width:800px;margin:0 auto;padding:0 16px}.header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:20px;padding:16px 0;display:flex}.header-left h1{font-size:20px;font-weight:700}.header-right{align-items:center;gap:12px;display:flex}.current-user{background:var(--primary);color:#fff;border-radius:20px;align-items:center;gap:8px;padding:6px 14px;font-size:14px;font-weight:600;display:flex}.nav{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);gap:4px;margin-bottom:20px;padding:4px;display:flex}.nav a{text-align:center;color:var(--text-secondary);border-radius:8px;flex:1;padding:10px 8px;font-size:14px;font-weight:500;text-decoration:none;transition:all .15s}.nav a:hover{color:var(--text);background:#f1f5f9}.nav a.active{background:var(--primary);color:#fff}.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:16px;padding:20px}.card h2{color:var(--text);margin-bottom:14px;font-size:17px}.form-group{margin-bottom:14px}.form-group label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;font-size:13px;font-weight:600;display:block}.form-group input,.form-group select,.form-group textarea{border:1px solid var(--border);border-radius:8px;outline:none;width:100%;padding:10px 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.15s}.tab:hover{color:var(--text)}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.task-item{border-bottom:1px solid var(--border);padding:14px 0}.task-item:last-child{border-bottom:none}.task-item h3{margin-bottom:4px;font-size:15px}.task-item .meta{color:var(--text-secondary);flex-wrap:wrap;align-items:center;gap:8px;margin-top:6px;font-size:12px;display:flex}.task-item .actions{flex-wrap:wrap;gap:8px;margin-top:10px;display:flex}.ranking-item{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:12px 0;display:flex}.ranking-item:last-child{border-bottom:none}.rank-num{color:#fff;background:var(--text-secondary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:14px;font-weight:700;display:flex}.rank-num.rank-1{background:#f59e0b}.rank-num.rank-2{background:#94a3b8}.rank-num.rank-3{background:#b45309}.ranking-item .name{flex:1;font-size:14px;font-weight:600}.ranking-item .points{color:var(--primary);font-size:16px;font-weight:700}.alert{border-radius:8px;margin-bottom:14px;padding:12px 16px;font-size:14px}.alert-error{color:#991b1b;background:#fef2f2;border:1px solid #fecaca}.alert-success{color:#166534;background:#f0fdf4;border:1px solid #bbf7d0}.alert-info{color:#1e40af;background:#eff6ff;border:1px solid #bfdbfe}.empty-state{text-align:center;color:var(--text-secondary);padding:40px 20px}.empty-state p{margin-top:8px;font-size:14px}.points-record{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:12px 0;display:flex}.points-record:last-child{border-bottom:none}.points-record .desc{font-size:14px;font-weight:500}.points-record .time{color:var(--text-secondary);margin-top:2px;font-size:11px}.points-record .amount{flex-shrink:0;font-size:16px;font-weight:700}.amount-positive{color:var(--success)}.amount-negative{color:var(--danger)}.sign-in-card{text-align:center;padding:24px}.sign-in-card 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