.upsc-hub{--hub-blue:#2563eb;--hub-blue-dark:#1d4ed8;--hub-blue-light:#eff6ff;--hub-orange:#2563eb;--hub-orange-light:#eff6ff;--hub-green:#059669;--hub-green-light:#ecfdf5;--hub-text:#0f172a;--hub-text-mid:#334155;--hub-text-light:#64748b;--hub-border:#e2e8f0;--hub-sidebar:275px;--hub-header:64px;--hub-radius:12px;--hub-shadow:0 2px 8px -2px #0f172a0d;--hub-shadow-hover:0 12px 24px -4px #0f172a14;--hub-transition:.18s cubic-bezier(.16, 1, .3, 1);font-family:var(--font-inter,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif);color:var(--hub-text);background:#f8fafc;min-height:100vh}.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{background:#fff;border-color:#2563eb;box-shadow:0 0 0 3px #2563eb26}.hub-cta,.hub-cta:link,.hub-cta:visited,.hub-cta:hover,.hub-cta:active,.hub-cta:focus,.hub-cta span{text-decoration:none!important}.hub-cta{white-space:nowrap;background:linear-gradient(135deg,#1d4ed8 0%,#2563eb 50%,#3b82f6 100%);border:1px solid #fff3;border-radius:8px;flex-shrink:0;align-items:center;gap:6px;padding:9px 16px;font-size:13px;font-weight:600;transition:all .2s cubic-bezier(.16,1,.3,1);display:inline-flex;box-shadow:0 2px 6px #2563eb47;color:#fff!important;text-decoration:none!important}.hub-cta:hover{background:linear-gradient(135deg,#1e40af 0%,#1d4ed8 100%);transform:translateY(-1px);box-shadow:0 4px 14px #2563eb66;color:#fff!important;text-decoration:none!important}.hub-sidebar{top:var(--hub-header);width:var(--hub-sidebar);scrollbar-width:thin;scrollbar-color:#94a3b8 transparent;z-index:900;background:#f1f5f9;border-right:1px solid #cbd5e1;padding:14px 10px 80px;position:fixed;bottom:0;left:0;overflow:hidden auto;box-shadow:2px 0 12px #0f172a0d}.hub-sidebar::-webkit-scrollbar{width:4px}.hub-sidebar::-webkit-scrollbar-track{background:0 0}.hub-sidebar::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:99px}.hub-sidebar::-webkit-scrollbar-thumb:hover{background:#94a3b8}.hub-sidebar-section{margin-bottom:8px}.hub-sidebar-label{color:#475569;text-transform:uppercase;letter-spacing:.09em;align-items:center;gap:6px;padding:10px 12px 6px;font-size:11px;font-weight:800;display:flex}.hub-sidebar a,.hub-sidebar a:hover{text-decoration:none}.hub-sidebar-link{color:#0f172a;border:1px solid #0000;border-radius:10px;justify-content:space-between;align-items:center;gap:10px;margin:3px 0;padding:8px 10px;font-size:13.5px;font-weight:600;text-decoration:none;transition:all .18s cubic-bezier(.16,1,.3,1);display:flex}.hub-sidebar-link:hover{color:#020617;background:#e2e8f0;border-color:#cbd5e1;text-decoration:none;transform:translate(3px)}.hub-sidebar-link:hover .hub-sidebar-icon{background:#fff;border-color:#94a3b8;transform:scale(1.06)}.hub-sidebar-link.active{background:linear-gradient(135deg,#3b82f6 0%,#2563eb 100%);border:1px solid #ffffff40;font-weight:700;transform:none;box-shadow:0 4px 14px #2563eb59;color:#fff!important}.hub-sidebar-link-left{align-items:center;gap:9px;min-width:0;display:flex;overflow:hidden}.hub-sidebar-icon{background:#fff;border:1px solid #cbd5e1;border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:15px;transition:all .18s;display:inline-flex;box-shadow:0 1px 2px #0f172a0a}.hub-sidebar-link.active .hub-sidebar-icon{box-shadow:none;background:#ffffff38;border-color:#0000}.hub-sidebar-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.hub-sidebar-count{color:#334155;background:#e2e8f0;border:1px solid #cbd5e1;border-radius:20px;flex-shrink:0;padding:1px 7px;font-size:11px;font-weight:700;transition:all .18s}.hub-sidebar-link:hover .hub-sidebar-count{color:#0f172a;background:#cbd5e1;border-color:#94a3b8}.hub-sidebar-link.active .hub-sidebar-count{color:#fff;background:#ffffff40;border-color:#fff6}.hub-sidebar-divider{background:#cbd5e1;height:1px;margin:10px 6px}.hub-sidebar-account{padding:4px 0 8px}.hub-sidebar-premium{letter-spacing:.03em;text-transform:uppercase;color:#fff;background:linear-gradient(135deg,#3b82f6 0%,#2563eb 100%);border-radius:999px;margin:4px 10px 10px;padding:4px 10px;font-size:11px;font-weight:800;display:inline-flex;box-shadow:0 2px 6px #2563eb40}.hub-sidebar-auth-btn{border-radius:8px;justify-content:center;align-items:center;margin:6px 10px;padding:10px 14px;font-family:inherit;font-size:13.5px;font-weight:700;text-decoration:none;display:flex}.hub-sidebar-auth-btn--outline{color:#1e293b;background:#f8fafc;border:1.5px solid #cbd5e1}.hub-sidebar-auth-btn--outline:hover{background:#f1f5f9;text-decoration:none}.hub-sidebar-auth-btn--primary{color:#fff;background:linear-gradient(#3b82f6 0%,#2563eb 100%);border:1.5px solid #2563eb;box-shadow:0 2px 6px #2563eb40}.hub-sidebar-auth-btn--primary:hover{background:linear-gradient(#2563eb 0%,#1d4ed8 100%);text-decoration:none}@media (min-width:769px){.hub-sidebar-account{display:none}}.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{color:#fff;background:linear-gradient(135deg,#070b14 0%,#0b1329 45%,#101d3f 80%,#1e3a8a 100%);border:1px solid #ffffff1f;border-radius:16px;margin-bottom:24px;padding:24px 28px;position:relative;overflow:hidden;box-shadow:0 14px 35px -5px #0b132940,0 0 50px -10px #2563eb26}.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{letter-spacing:-.01em;margin-bottom:4px;font-size:18px;font-weight:800}.hub-progress-sub{opacity:.85;font-size:13.5px}.hub-progress-stats{flex-wrap:wrap;gap:10px;display:flex}.hub-stat-pill{-webkit-backdrop-filter:blur(8px);background:#ffffff1f;border:1px solid #fff3;border-radius:99px;align-items:center;gap:6px;padding:6px 14px;font-size:12.5px;display:flex}.hub-stat-pill strong{font-size:15px;font-weight:800}.hub-progress-bar-wrap{z-index:1;margin-top:18px;position:relative}.hub-progress-bar-label{opacity:.88;justify-content:space-between;margin-bottom:6px;font-size:12px;font-weight:600;display:flex}.hub-progress-track{background:#ffffff2e;border-radius:99px;height:8px;overflow:hidden}.hub-progress-fill{background:linear-gradient(90deg,#3b82f6 0%,#2563eb 50%,#10b981 100%);border-radius:99px;min-width:2px;height:100%;transition:width .6s cubic-bezier(.4,0,.2,1);box-shadow:0 0 10px #3b82f680}.hub-subject-hero{background:#fff;border:1px solid #e2e8f0;border-radius:14px;flex-wrap:wrap;align-items:flex-start;gap:20px;margin-bottom:24px;padding:24px 28px;transition:all .2s;display:flex;box-shadow:0 4px 20px #0000000a}.hub-subject-hero-icon{background:#f1f5f9;border:1px solid #e2e8f0;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:56px;height:56px;font-size:36px;display:flex}.hub-subject-hero-paper{color:#1d4ed8;text-transform:uppercase;letter-spacing:.06em;background:#eff6ff;border:1px solid #dbeafe;border-radius:99px;margin-bottom:8px;padding:3px 12px;font-size:11px;font-weight:800;display:inline-block}.hub-subject-hero-name{color:#0f172a;letter-spacing:-.02em;margin-bottom:6px;font-size:24px;font-weight:800}.hub-subject-hero-desc{color:#475569;font-size:14px;line-height:1.6}.hub-subject-hero-stats{border-top:1px solid #f1f5f9;flex-wrap:wrap;gap:24px;margin-top:18px;padding-top:14px;display:flex}.hub-subject-stat-val{color:#1d4ed8;font-size:22px;font-weight:800;line-height:1.2}.hub-subject-stat-label{color:#64748b;margin-top:2px;font-size:11.5px;font-weight:600}.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:24px;display:flex}.hub-filter-label{color:#64748b;text-transform:uppercase;letter-spacing:.08em;margin-right:6px;font-size:11px;font-weight:800}.hub-filter-btn{color:#475569;cursor:pointer;background:#fff;border:1px solid #e2e8f0;border-radius:99px;padding:7px 16px;font-family:inherit;font-size:13px;font-weight:600;transition:all .18s cubic-bezier(.16,1,.3,1);box-shadow:0 1px 3px #0000000a}.hub-filter-btn:hover{color:#0f172a;background:#f8fafc;border-color:#cbd5e1;transform:translateY(-1px)}.hub-filter-btn.active{color:#fff;background:linear-gradient(#3b82f6 0%,#2563eb 100%);border-color:#2563eb;transform:none;box-shadow:0 4px 14px #2563eb59}.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(320px,1fr));gap:20px;display:grid}.hub-topic-card{background:#fff;border:1px solid #e2e8f0;border-radius:14px;flex-direction:column;transition:all .22s cubic-bezier(.16,1,.3,1);display:flex;overflow:hidden;box-shadow:0 3px 12px #0000000a}.hub-topic-card:hover{border-color:#cbd5e1;transform:translateY(-4px);box-shadow:0 12px 28px #00000017}.hub-card-stripe{height:3.5px}.hub-card-stripe--high{background:linear-gradient(90deg,#2563eb,#3b82f6)}.hub-card-stripe--medium{background:linear-gradient(90deg,#0284c7,#38bdf8)}.hub-card-stripe--low{background:linear-gradient(90deg,#059669,#34d399)}.hub-card-body{flex-direction:column;flex:1;gap:12px;padding:18px 20px 14px;display:flex}.hub-card-top{justify-content:space-between;align-items:flex-start;gap:10px;display:flex}.hub-card-title{color:#0f172a;margin-bottom:4px;font-size:15.5px;font-weight:700;line-height:1.35}.hub-card-sub{color:#64748b;font-size:12.5px;line-height:1.45}.hub-status-badge{text-transform:uppercase;letter-spacing:.04em;border-radius:99px;flex-shrink:0;padding:3px 10px;font-size:10.5px;font-weight:700}.hub-status-live{color:#059669;background:#ecfdf5;border:1px solid #a7f3d0}.hub-status-soon{color:#94a3b8;background:#f1f5f9;border:1px solid #e2e8f0}.hub-status-premium{color:#d97706;background:#fef3c7;border:1px solid #fde68a}.hub-subject-chip{color:#1d4ed8;background:#eff6ff;border:1px solid #dbeafe;border-radius:6px;padding:2px 8px;font-size:11px;font-weight:600}.hub-card-meta{color:#64748b;flex-wrap:wrap;gap:12px;font-size:11.5px;font-weight:500;display:flex}.hub-tag-chip{color:#475569;background:#f8fafc;border:1px solid #e2e8f0;border-radius:6px;padding:2px 8px;font-size:11.5px}.hub-card-footer{background:#fafbfc;border-top:1px solid #f1f5f9;justify-content:space-between;align-items:center;gap:10px;padding:14px 20px 16px;display:flex}.hub-read-btn{cursor:pointer;border:none;border-radius:9px;align-items:center;gap:7px;padding:9px 18px;font-family:inherit;font-size:13.5px;font-weight:700;text-decoration:none;transition:all .18s cubic-bezier(.16,1,.3,1);display:inline-flex}.hub-read-btn__arrow{transition:transform .18s}.hub-read-btn--active{color:#fff;background:linear-gradient(#3b82f6 0%,#2563eb 100%);border-top:1px solid #fff3;box-shadow:0 2px 6px #2563eb40}.hub-read-btn--active:hover{color:#fff;background:linear-gradient(#2563eb 0%,#1d4ed8 100%);text-decoration:none;transform:translateY(-1px);box-shadow:0 4px 12px #2563eb59}.hub-read-btn--active:hover .hub-read-btn__arrow{transform:translate(3px)}.hub-read-btn--disabled{color:#94a3b8;cursor:not-allowed;background:#e2e8f0}.hub-read-btn--locked{color:#fff;background:linear-gradient(#3b82f6 0%,#2563eb 100%);border-top:1px solid #fff3;box-shadow:0 2px 6px #2563eb40}.hub-done-btn{cursor:pointer;color:#94a3b8;background:#fff;border:1.5px solid #e2e8f0;border-radius:9px;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:15px;font-weight:700;transition:all .18s cubic-bezier(.16,1,.3,1);display:flex}.hub-done-btn:hover{color:#059669;background:#ecfdf5;border-color:#10b981;transform:scale(1.05)}.hub-done-btn.done{color:#fff;background:linear-gradient(135deg,#059669 0%,#10b981 100%);border-color:#059669;box-shadow:0 4px 12px #10b98152}.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}.hub-mobile-search{margin-bottom:14px;display:none;position:relative}.hub-mobile-search svg{color:var(--hub-text-light);pointer-events:none;position:absolute;top:50%;left:12px;transform:translateY(-50%)}.hub-mobile-search__input{border:1.5px solid var(--hub-border);width:100%;color:var(--hub-text);background:#fff;border-radius:8px;outline:none;padding:10px 12px 10px 36px;font-family:inherit;font-size:14px}.hub-mobile-search__input:focus{border-color:var(--hub-blue);box-shadow:0 0 0 3px #1a4f9c1a}@media (max-width:768px){.hub-hamburger{display:flex}.hub-sidebar{z-index:950;border-right:none;border-left:1px solid var(--hub-border);transition:transform .28s;left:auto;right:0;transform:translate(100%);box-shadow:-4px 0 20px #0000001f}.hub-sidebar.open{transform:translate(0)}.hub-overlay{z-index:940}.hub-main{margin-left:0;padding:14px 12px 40px}.hub-header-title,.hub-search-wrap{display:none}.hub-mobile-search{display:block}.hub-progress-banner{margin-bottom:16px;padding:18px 16px}.hub-progress-title{font-size:16px;line-height:1.35}.hub-progress-sub{font-size:12.5px}.hub-progress-stats{width:100%}.hub-stat-pill{padding:5px 10px;font-size:12px}.hub-subject-hero{gap:12px;margin-bottom:16px;padding:16px}.hub-subject-hero-icon{font-size:36px}.hub-subject-hero-name{font-size:18px}.hub-subject-hero-desc{font-size:13px}.hub-subject-hero-stats{gap:14px}.hub-filter-bar{-webkit-overflow-scrolling:touch;scrollbar-width:none;flex-wrap:nowrap;gap:6px;margin-bottom:16px;padding-bottom:2px;overflow-x:auto}.hub-filter-bar::-webkit-scrollbar{display:none}.hub-filter-label{flex-shrink:0}.hub-filter-btn{flex-shrink:0;padding:6px 12px;font-size:12px}.hub-cards-grid,.hub-subject-grid{grid-template-columns:1fr;gap:12px}.hub-cta span{display:none}.hub-scroll-top{width:40px;height:40px;bottom:18px;right:16px}}@media (max-width:420px){.hub-main{padding:12px 10px 36px}.hub-progress-banner{padding:14px 12px}.hub-card-footer{flex-wrap:wrap}}