:root{--bg:#0f1220;--surface:#171b2e;--surface-alt:#1e2338;--surface-pressed:#272d46;--border:#262c44;--divider:#20263c;--text:#f2f4fb;--text-secondary:#9aa3bf;--text-muted:#6b7391;--accent:#7c6cff;--accent-soft:#7c6cff29;--accent-pressed:#6959e6;--danger:#ff6b7a;--danger-soft:#ff6b7a29;--success:#3dd68c;--success-soft:#3dd68c29;--warning:#ffb84d;--radius:12px;--radius-lg:16px;--radius-xl:22px;--easy:#2dbe7e;--medium:#3b87f0;--hard:#f59e0b;--expert:#f0506e}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:15px;line-height:1.5}a{color:var(--accent);text-decoration:none}.app-shell{grid-template-columns:240px 1fr;min-height:100vh;display:grid}.sidebar{background:var(--surface);border-right:1px solid var(--border);flex-direction:column;gap:4px;padding:24px 16px;display:flex}.brand{align-items:center;gap:12px;padding:0 8px 24px;display:flex}.brand-mark{border-radius:var(--radius);background:linear-gradient(135deg, var(--accent), #4ecdc4);color:#fff;place-items:center;width:38px;height:38px;font-size:18px;font-weight:800;display:grid}.brand-name{letter-spacing:-.3px;font-size:17px;font-weight:800}.brand-sub{color:var(--text-muted);font-size:11px;font-weight:600}.nav-link{border-radius:var(--radius);color:var(--text-secondary);align-items:center;gap:10px;padding:10px 12px;font-size:14px;font-weight:600;transition:background .12s;display:flex}.nav-link:hover{background:var(--surface-alt);color:var(--text)}.nav-link.active{background:var(--accent-soft);color:var(--accent)}.sidebar-footer{border-top:1px solid var(--divider);color:var(--text-muted);margin-top:auto;padding-top:16px;font-size:12px}.content{max-width:1200px;padding:28px 32px 64px}.page-head{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:24px;display:flex}.page-title{letter-spacing:-.4px;margin:0;font-size:24px;font-weight:800}.page-sub{color:var(--text-secondary);margin:4px 0 0;font-size:14px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:20px}.card+.card{margin-top:16px}.card-title{margin:0 0 16px;font-size:15px;font-weight:700}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;display:grid}.stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:18px}.stat-value{letter-spacing:-.5px;font-variant-numeric:tabular-nums;font-size:28px;font-weight:800}.stat-label{color:var(--text-secondary);margin-top:2px;font-size:13px;font-weight:600}.field{margin-bottom:16px}.label{letter-spacing:.4px;text-transform:uppercase;color:var(--text-muted);margin-bottom:6px;font-size:12px;font-weight:700;display:block}.input,.textarea,.select{background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text);outline:none;padding:10px 12px;font-family:inherit;font-size:14px;transition:border-color .12s}.input:focus,.textarea:focus,.select:focus{border-color:var(--accent)}.textarea{resize:vertical;min-height:110px;line-height:1.6}.hint{color:var(--text-muted);margin-top:6px;font-size:12px}.row{flex-wrap:wrap;gap:16px;display:flex}.row>*{flex:1;min-width:200px}.btn{border-radius:var(--radius);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-family:inherit;font-size:14px;font-weight:700;transition:opacity .12s,transform .12s;display:inline-flex}.btn:active:not(:disabled){transform:scale(.98)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-secondary{background:var(--surface-alt);color:var(--text);border:1px solid var(--border)}.btn-danger{background:var(--danger-soft);color:var(--danger)}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-sm{padding:6px 12px;font-size:13px}.table{border-collapse:collapse;width:100%}.table th{text-align:right;letter-spacing:.5px;text-transform:uppercase;color:var(--text-muted);border-bottom:1px solid var(--divider);padding:0 12px 12px;font-size:11px;font-weight:700}.table th:first-child,.table td:first-child{text-align:left}.table td{border-bottom:1px solid var(--divider);text-align:right;vertical-align:middle;padding:14px 12px}.table tbody tr:hover{background:var(--surface-alt)}.table tbody tr:last-child td{border-bottom:none}.thumb{border-radius:var(--radius);object-fit:cover;background:var(--surface-alt);width:48px;height:48px;display:block}.thumb-empty{border-radius:var(--radius);background:var(--surface-alt);border:1px dashed var(--border);width:48px;height:48px;color:var(--text-muted);place-items:center;font-size:18px;display:grid}.badge{background:var(--surface-alt);color:var(--text-secondary);border-radius:999px;align-items:center;gap:5px;padding:3px 9px;font-size:11px;font-weight:700;display:inline-flex}.badge-dot{border-radius:3px;width:6px;height:6px}.badge-active{background:var(--success-soft);color:var(--success)}.badge-passive{background:var(--surface-alt);color:var(--text-muted)}.badge-group{flex-wrap:wrap;justify-content:flex-end;gap:5px;display:flex}.tabs{background:var(--surface-alt);border-radius:var(--radius);flex-wrap:wrap;gap:4px;margin-bottom:16px;padding:4px;display:flex}.tab{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:8px;align-items:center;gap:6px;padding:7px 14px;font-family:inherit;font-size:13px;font-weight:600;display:flex}.tab.active{background:var(--surface);color:var(--text)}.tab-filled{background:var(--success);border-radius:3px;width:6px;height:6px}.tab-empty{background:var(--border);border-radius:3px;width:6px;height:6px}.chips{flex-wrap:wrap;gap:8px;display:flex}.chip{border:1px solid var(--border);background:var(--surface-alt);color:var(--text-secondary);cursor:pointer;border-radius:999px;align-items:center;gap:7px;padding:8px 14px;font-family:inherit;font-size:13px;font-weight:600;display:inline-flex}.chip.selected{border-color:var(--accent);background:var(--accent-soft);color:var(--text)}.switch-row{border-bottom:1px solid var(--divider);justify-content:space-between;align-items:center;gap:16px;padding:14px 0;display:flex}.switch-row:last-child{border-bottom:none}.switch-text strong{font-size:14px;font-weight:600;display:block}.switch-text span{color:var(--text-secondary);font-size:12px}.switch{flex-shrink:0;width:46px;height:26px;position:relative}.switch input{opacity:0;width:0;height:0}.switch-track{background:var(--surface-pressed);cursor:pointer;border-radius:999px;transition:background .16s;position:absolute;inset:0}.switch-track:before{content:"";background:#fff;border-radius:50%;width:20px;height:20px;transition:transform .16s;position:absolute;top:3px;left:3px}.switch input:checked+.switch-track{background:var(--accent)}.switch input:checked+.switch-track:before{transform:translate(20px)}.login-shell{place-items:center;min-height:100vh;padding:24px;display:grid}.login-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:380px;padding:32px}.login-brand{flex-direction:column;align-items:center;gap:12px;margin-bottom:28px;display:flex}.empty{text-align:center;color:var(--text-secondary);padding:56px 24px}.empty-icon{margin-bottom:12px;font-size:34px}.error-text{color:var(--danger);margin-top:10px;font-size:13px}.toolbar{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:20px;display:flex}.toolbar .input,.toolbar .select{flex:0 auto;width:auto;min-width:160px}.spacer{flex:1}.pagination{color:var(--text-secondary);justify-content:center;align-items:center;gap:12px;margin-top:20px;font-size:13px;display:flex}.image-preview{align-items:center;gap:16px;display:flex}.image-preview img{object-fit:cover;border-radius:var(--radius-lg);border:1px solid var(--border);width:120px;height:120px}@media (width<=860px){.app-shell{grid-template-columns:1fr}.sidebar{flex-direction:row;align-items:center;padding:12px;overflow-x:auto}.brand,.sidebar-footer{display:none}.content{padding:20px 16px 48px}}