.upsc-hub{--hub-blue:#1a4f9c;--hub-blue-dark:#12357a;--hub-blue-light:#e8f0fb;--hub-orange:#f06a1e;--hub-orange-light:#fff4ee;--hub-green:#2e8a57;--hub-green-light:#eaf7f0;--hub-text:#1a1a2e;--hub-text-mid:#444;--hub-text-light:#888;--hub-border:#e2e8f0;--hub-sidebar:260px;--hub-header:64px;--hub-radius:10px;--hub-shadow:0 2px 12px #00000014;--hub-shadow-hover:0 6px 24px #00000024;--hub-transition:.18s ease;color:var(--hub-text);background:#f5f7fa;min-height:100vh;font-family:Segoe UI,system-ui,-apple-system,sans-serif}.upsc-hub *,.upsc-hub :before,.upsc-hub :after{box-sizing:border-box}.hub-header{height:var(--hub-header);border-bottom:1px solid var(--hub-border);z-index:1000;background:#fff;align-items:center;gap:16px;padding:0 20px;display:flex;position:fixed;top:0;left:0;right:0;box-shadow:0 2px 8px #0000000f}.hub-hamburger{cursor:pointer;color:var(--hub-text);background:0 0;border:none;border-radius:6px;flex-shrink:0;padding:6px;display:none}.hub-hamburger:hover{background:var(--hub-blue-light)}.hub-header-title{text-align:center;white-space:nowrap;flex:1;font-size:16px;font-weight:700}.hub-header-title span{color:var(--hub-blue)}.hub-search-wrap{flex-shrink:0;position:relative}.hub-search-wrap svg{color:var(--hub-text-light);pointer-events:none;position:absolute;top:50%;left:10px;transform:translateY(-50%)}.hub-search-input{border:1.5px solid var(--hub-border);width:240px;color:var(--hub-text);transition:border-color var(--hub-transition), box-shadow var(--hub-transition);background:#f9fafb;border-radius:8px;outline:none;padding:8px 12px 8px 34px;font-family:inherit;font-size:13.5px}.hub-search-input:focus{border-color:var(--hub-blue);background:#fff;box-shadow:0 0 0 3px #1a4f9c1a}.hub-cta{background:var(--hub-orange);color:#fff;transition:background var(--hub-transition), transform var(--hub-transition);white-space:nowrap;border-radius:8px;flex-shrink:0;align-items:center;gap:6px;padding:9px 16px;font-size:13px;font-weight:600;text-decoration:none;display:inline-flex}.hub-cta:hover{background:#d45a10;transform:translateY(-1px)}.hub-sidebar{top:var(--hub-header);width:var(--hub-sidebar);border-right:1px solid var(--hub-border);scrollbar-width:none;-ms-overflow-style:none;z-index:900;background:#fafbfc;padding:8px 0 32px;position:fixed;bottom:0;left:0;overflow:hidden auto}.hub-sidebar::-webkit-scrollbar{display:none}.hub-sidebar-label{color:var(--hub-text-light);text-transform:uppercase;letter-spacing:1px;padding:18px 16px 6px;font-size:10px;font-weight:700}.hub-sidebar a,.hub-sidebar a:hover{text-decoration:none}.hub-sidebar-link{transition:background var(--hub-transition), color var(--hub-transition);color:var(--hub-text-mid);border-radius:8px;justify-content:space-between;align-items:center;margin:2px 10px;padding:10px 14px;font-size:13.5px;text-decoration:none;display:flex}.hub-sidebar-link:hover{background:var(--hub-blue-light);color:var(--hub-blue);text-decoration:none}.hub-sidebar-link.active{background:var(--hub-blue-light);color:var(--hub-blue);box-shadow:inset 3px 0 0 var(--hub-blue);font-weight:600}.hub-sidebar-link-left{align-items:center;gap:8px;display:flex}.hub-sidebar-count{background:var(--hub-blue-light);color:var(--hub-blue);border-radius:20px;padding:1px 7px;font-size:11px;font-weight:600}.hub-sidebar-link.active .hub-sidebar-count{background:var(--hub-blue);color:#fff}.hub-sidebar-divider{background:var(--hub-border);height:1px;margin:8px 16px}.hub-overlay{z-index:850;background:#0006;display:none;position:fixed;inset:0}.hub-overlay.visible{display:block}.hub-main{margin-left:var(--hub-sidebar);margin-top:var(--hub-header);min-height:calc(100vh - var(--hub-header));padding:28px 28px 48px}.hub-main--index{max-width:1100px;margin-left:auto;margin-right:auto;padding-left:24px;padding-right:24px}.hub-progress-banner{background:linear-gradient(135deg, var(--hub-blue-dark) 0%, var(--hub-blue) 60%, #2563c7 100%);border-radius:var(--hub-radius);color:#fff;margin-bottom:24px;padding:24px 28px;position:relative;overflow:hidden}.hub-progress-top{z-index:1;flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:16px;display:flex;position:relative}.hub-progress-title{margin-bottom:4px;font-size:18px;font-weight:700}.hub-progress-sub{opacity:.78;font-size:13px}.hub-progress-stats{flex-wrap:wrap;gap:10px;display:flex}.hub-stat-pill{background:#ffffff24;border:1px solid #ffffff38;border-radius:20px;align-items:center;gap:6px;padding:6px 14px;font-size:12.5px;display:flex}.hub-stat-pill strong{font-size:15px}.hub-progress-bar-wrap{z-index:1;margin-top:18px;position:relative}.hub-progress-bar-label{opacity:.8;justify-content:space-between;margin-bottom:6px;font-size:12px;display:flex}.hub-progress-track{background:#fff3;border-radius:20px;height:8px;overflow:hidden}.hub-progress-fill{background:linear-gradient(90deg,#60d090,#34d399);border-radius:20px;min-width:2px;height:100%;transition:width .6s cubic-bezier(.4,0,.2,1)}.hub-subject-hero{border-radius:var(--hub-radius);border:1px solid var(--hub-border);box-shadow:var(--hub-shadow);background:#fff;flex-wrap:wrap;align-items:flex-start;gap:18px;margin-bottom:20px;padding:22px 24px;display:flex}.hub-subject-hero-icon{font-size:44px;line-height:1}.hub-subject-hero-paper{color:var(--hub-blue);background:var(--hub-blue-light);text-transform:uppercase;letter-spacing:.5px;border-radius:20px;margin-bottom:6px;padding:2px 10px;font-size:11px;font-weight:700;display:inline-block}.hub-subject-hero-name{margin-bottom:4px;font-size:21px;font-weight:700}.hub-subject-hero-desc{color:var(--hub-text-mid);font-size:13.5px;line-height:1.5}.hub-subject-hero-stats{flex-wrap:wrap;gap:20px;margin-top:12px;display:flex}.hub-subject-stat-val{color:var(--hub-blue);font-size:20px;font-weight:700}.hub-subject-stat-label{color:var(--hub-text-light);font-size:11px}.hub-index-section{margin-bottom:28px}.hub-index-section-title{color:var(--hub-text-light);text-transform:uppercase;letter-spacing:1px;margin-bottom:12px;font-size:12px;font-weight:700}.hub-subject-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;display:grid}.hub-subject-card{border:1px solid var(--hub-border);border-radius:var(--hub-radius);color:inherit;box-shadow:var(--hub-shadow);transition:box-shadow var(--hub-transition), transform var(--hub-transition);background:#fff;flex-direction:column;gap:8px;padding:20px;text-decoration:none;display:flex}.hub-subject-card:hover{box-shadow:var(--hub-shadow-hover);transform:translateY(-2px)}.hub-subject-card-top{align-items:center;gap:12px;display:flex}.hub-subject-card-icon{font-size:32px;line-height:1}.hub-subject-card-name{color:var(--hub-text);font-size:16px;font-weight:700}.hub-subject-card-paper{color:var(--hub-blue);font-size:11px;font-weight:600}.hub-subject-card-desc{color:var(--hub-text-mid);flex:1;font-size:13px;line-height:1.45}.hub-subject-card-meta{color:var(--hub-text-light);gap:12px;margin-top:4px;font-size:12px;display:flex}.hub-subject-card-cta{color:var(--hub-blue);margin-top:8px;font-size:13px;font-weight:600}.hub-filter-bar{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:22px;display:flex}.hub-filter-label{color:var(--hub-text-light);text-transform:uppercase;letter-spacing:.5px;margin-right:4px;font-size:12px;font-weight:600}.hub-filter-btn{border:1.5px solid var(--hub-border);color:var(--hub-text-mid);cursor:pointer;transition:all var(--hub-transition);background:#fff;border-radius:20px;padding:6px 14px;font-family:inherit;font-size:12.5px;font-weight:500}.hub-filter-btn:hover{border-color:var(--hub-blue);color:var(--hub-blue);background:var(--hub-blue-light)}.hub-filter-btn.active{background:var(--hub-blue);color:#fff;border-color:var(--hub-blue)}.hub-search-info{background:var(--hub-blue-light);color:var(--hub-blue);border:1px solid #c2d4f0;border-radius:8px;margin-bottom:18px;padding:10px 16px;font-size:13px;font-weight:500}.hub-cards-grid{grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:18px;display:grid}.hub-topic-card{border-radius:var(--hub-radius);border:1px solid var(--hub-border);box-shadow:var(--hub-shadow);transition:box-shadow var(--hub-transition), transform var(--hub-transition);background:#fff;flex-direction:column;display:flex;overflow:hidden}.hub-topic-card:hover{box-shadow:var(--hub-shadow-hover);transform:translateY(-2px)}.hub-card-stripe{height:4px}.hub-card-stripe--high{background:#ef4444}.hub-card-stripe--medium{background:var(--hub-orange)}.hub-card-stripe--low{background:var(--hub-green)}.hub-card-body{flex-direction:column;flex:1;gap:10px;padding:16px 18px 14px;display:flex}.hub-card-top{justify-content:space-between;align-items:flex-start;gap:10px;display:flex}.hub-card-title{margin-bottom:3px;font-size:15px;font-weight:700;line-height:1.3}.hub-card-sub{color:var(--hub-text-light);font-size:12px;line-height:1.4}.hub-status-badge{text-transform:uppercase;letter-spacing:.4px;border-radius:12px;flex-shrink:0;padding:3px 9px;font-size:10.5px;font-weight:700}.hub-status-live{background:var(--hub-green-light);color:var(--hub-green)}.hub-status-soon{color:#94a3b8;background:#f1f5f9}.hub-subject-chip{background:var(--hub-blue-light);color:var(--hub-blue);border-radius:6px;padding:2px 8px;font-size:11px;font-weight:600}.hub-card-meta{color:var(--hub-text-mid);flex-wrap:wrap;gap:12px;font-size:11.5px;display:flex}.hub-tag-chip{color:var(--hub-text-mid);border:1px solid var(--hub-border);background:#f1f5f9;border-radius:6px;padding:2px 8px;font-size:11px}.hub-card-footer{border-top:1px solid var(--hub-border);justify-content:space-between;align-items:center;gap:10px;padding:12px 18px 16px;display:flex}.hub-read-btn{cursor:pointer;transition:all var(--hub-transition);border:none;border-radius:8px;align-items:center;gap:6px;padding:8px 16px;font-family:inherit;font-size:13px;font-weight:600;text-decoration:none;display:inline-flex}.hub-read-btn--active{background:var(--hub-blue);color:#fff}.hub-read-btn--active:hover{background:var(--hub-blue-dark);transform:translateY(-1px)}.hub-read-btn--disabled{color:#94a3b8;cursor:not-allowed;background:#f1f5f9}.hub-done-btn{border:2px solid var(--hub-border);cursor:pointer;width:34px;height:34px;transition:all var(--hub-transition);color:var(--hub-text-light);background:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:16px;display:flex}.hub-done-btn:hover{border-color:var(--hub-green);background:var(--hub-green-light);color:var(--hub-green)}.hub-done-btn.done{background:var(--hub-green);border-color:var(--hub-green);color:#fff}.hub-empty{text-align:center;color:var(--hub-text-light);padding:64px 24px}.hub-empty h3{color:var(--hub-text-mid);margin:16px 0 8px;font-size:18px}.hub-scroll-top{background:var(--hub-blue);color:#fff;cursor:pointer;z-index:800;border:none;border-radius:50%;justify-content:center;align-items:center;width:44px;height:44px;display:none;position:fixed;bottom:28px;right:28px;box-shadow:0 4px 16px #1a4f9c4d}.hub-scroll-top.visible{display:flex}@media (max-width:768px){.hub-hamburger{display:flex}.hub-sidebar{z-index:950;transition:transform .28s;transform:translate(-100%);box-shadow:4px 0 20px #0000001f}.hub-sidebar.open{transform:translate(0)}.hub-main{margin-left:0;padding:16px 14px 40px}.hub-header-title,.hub-search-wrap{display:none}.hub-search-wrap.mobile-visible{top:var(--hub-header);border-bottom:1px solid var(--hub-border);z-index:990;background:#fff;padding:10px 14px;display:block;position:fixed;left:0;right:0}.hub-search-wrap.mobile-visible .hub-search-input{width:100%}.hub-cards-grid,.hub-subject-grid{grid-template-columns:1fr}.hub-cta span{display:none}}