@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap";:root{--bg-color: #000000;--surface-color: #202124;--surface-hover: #2d2f31;--text-primary: #e8eaed;--text-secondary: #9aa0a6;--border-color: #3c4043;--primary-color: #8ab4f8;--primary-hover: #1a73e8;--danger-color: #f28b82;--warning-color: #fdd663;--revision-color: #3ddc84;--shadow-sm: 0 1px 3px 0 rgb(0 0 0 / .4);--shadow-md: 0 4px 12px -1px rgb(0 0 0 / .5), 0 2px 6px -2px rgb(0 0 0 / .3);--shadow-lg: 0 10px 30px -3px rgb(0 0 0 / .6), 0 4px 10px -4px rgb(0 0 0 / .4);--glass-bg: rgba(32, 33, 36, .85);--glass-border: rgba(255, 255, 255, .07);--sidebar-width: 280px;--header-height: 70px}[data-theme=light]{--bg-color: #f8fafc;--surface-color: #ffffff;--surface-hover: #f1f5f9;--text-primary: #000000;--text-secondary: #4f4f4f;--border-color: #e2e8f0;--primary-color: #eb5757;--primary-hover: #dc2626;--danger-color: #ef4444;--warning-color: #f59e0b;--revision-color: #f97316;--shadow-sm: 0 1px 3px 0 rgb(0 0 0 / .06);--shadow-md: 0 4px 12px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 30px -3px rgb(0 0 0 / .15);--glass-bg: rgba(248, 250, 252, .88);--glass-border: rgba(0, 0, 0, .06)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,sans-serif;background-color:var(--bg-color);color:var(--text-primary);transition:background-color .3s ease,color .3s ease;line-height:1.5;-webkit-font-smoothing:antialiased}.app-container{display:flex;flex-direction:column;height:100vh;overflow:hidden}.header{height:var(--header-height);background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 2rem;z-index:50}.header-left .logo{font-size:1.5rem;font-weight:800;background:linear-gradient(135deg,#34d399,#059669);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;cursor:pointer}.header-right{display:flex;align-items:center;gap:1.5rem}.icon-btn{background:transparent;border:none;color:var(--text-primary);cursor:pointer;display:flex;align-items:center;justify-content:center;padding:.5rem;border-radius:50%;transition:background-color .2s}.icon-btn:hover{background-color:var(--surface-hover)}.btn-primary{background-color:var(--primary-color);color:#fff;border:none;padding:.5rem 1rem;border-radius:.5rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-1px)}.btn-secondary{background-color:var(--surface-hover);color:var(--text-primary);border:1px solid var(--border-color);padding:.5rem 1rem;border-radius:.5rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-secondary:hover{border-color:var(--text-secondary)}.main-layout{display:flex;flex:1;overflow:hidden}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);background-color:var(--surface-color);border-right:1px solid var(--border-color);display:flex;flex-direction:column;padding:1.5rem 0;overflow-y:auto;transition:width .3s ease,min-width .3s ease,padding .3s ease;position:relative}.sidebar.collapsed{width:72px;min-width:72px;padding:1.5rem 0}.sidebar-toggle-btn{width:36px;height:32px;border-radius:6px;background:var(--surface-hover);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-secondary);transition:all .2s;flex-shrink:0}.sidebar-toggle-btn:hover{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.sidebar-title{padding:0 1.5rem .5rem;font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);font-weight:700;white-space:nowrap;overflow:hidden}.sidebar.collapsed .sidebar-title,.sidebar.collapsed .sheet-list{opacity:0;pointer-events:none}.sheet-list{list-style:none;display:flex;flex-direction:column;gap:.25rem;padding:0 1rem;transition:opacity .2s ease}.sheet-item{padding:.75rem 1rem;border-radius:.5rem;cursor:pointer;font-weight:500;color:var(--text-secondary);transition:all .2s;display:flex;align-items:center;gap:.75rem;white-space:nowrap}.sheet-item:hover{background-color:var(--surface-hover);color:var(--text-primary)}.sheet-item.active{background-color:#8ab4f81a;color:var(--primary-color)}.main-content{flex:1;overflow-y:auto;padding:2rem 3rem;scroll-behavior:smooth}.sheet-header{margin-bottom:2rem}.sheet-header h1{font-size:2.25rem;font-weight:800;margin-bottom:.5rem}.sheet-header p{color:var(--text-secondary);font-size:1.1rem;max-width:800px}.sheet-header p a{color:var(--primary-color);text-decoration:none;font-weight:600;border-bottom:1px solid transparent;transition:all .2s}.sheet-header p a:hover{border-bottom-color:var(--primary-color);opacity:.8}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.5rem;margin-bottom:2rem}.stat-card{background:var(--surface-color);border:1px solid var(--border-color);border-radius:1rem;padding:1.5rem;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;box-shadow:var(--shadow-sm);transition:transform .2s}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.stat-icon{font-size:2rem;margin-bottom:.5rem}.stat-value{font-size:1.75rem;font-weight:800;color:var(--text-primary)}.stat-label{font-size:.75rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin-top:.25rem}.filter-search-container{display:flex;flex-direction:column;gap:1rem;margin-bottom:2rem}.search-bar{display:flex;align-items:center;background-color:var(--surface-color);border:1px solid var(--border-color);border-radius:.5rem;padding:.75rem 1rem;transition:border-color .2s}.search-bar:focus-within{border-color:var(--primary-color)}.search-bar input{background:transparent;border:none;color:var(--text-primary);font-size:1rem;width:100%;margin-left:.75rem;outline:none}.filter-tabs{display:flex;gap:.5rem;flex-wrap:wrap}.filter-tab{background-color:var(--surface-color);border:1px solid var(--border-color);color:var(--text-secondary);padding:.5rem 1rem;border-radius:2rem;font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:.5rem}.filter-tab:hover{background-color:var(--surface-hover)}.filter-tab.active{background-color:var(--primary-color);color:#fff;border-color:var(--primary-color)}.accordion-group{margin-bottom:1rem;border:1px solid var(--border-color);border-radius:.75rem;overflow:hidden;background-color:var(--surface-color)}.accordion-header{padding:1rem 1.5rem;display:flex;justify-content:space-between;align-items:center;cursor:pointer;background-color:var(--surface-color);transition:background-color .2s;font-weight:600;font-size:1.1rem}.accordion-header:hover{background-color:var(--surface-hover)}.accordion-body{border-top:1px solid var(--border-color)}.questions-table{width:100%;border-collapse:collapse}.questions-table th,.questions-table td{padding:.75rem 1.5rem;text-align:left;border-bottom:1px solid var(--border-color)}.questions-table th{font-size:.75rem;text-transform:uppercase;color:var(--text-secondary);font-weight:600;background-color:var(--bg-color)}.questions-table tr:last-child td{border-bottom:none}.questions-table tr{transition:background-color .15s}.questions-table tr:hover{background-color:var(--surface-hover)}.status-checkbox{width:1.25rem;height:1.25rem;cursor:pointer;accent-color:var(--primary-color)}.question-title-cell{display:flex;align-items:center;gap:.75rem}.question-link{color:var(--text-primary);text-decoration:none;font-weight:500}.question-link:hover{color:var(--primary-color)}.platform-icon{width:16px;height:16px;opacity:.7}.difficulty-badge{padding:.25rem .5rem;border-radius:.25rem;font-size:.75rem;font-weight:600;text-transform:uppercase}.diff-easy{background-color:#10b9811a;color:#10b981}.diff-medium{background-color:#f59e0b1a;color:#f59e0b}.diff-hard{background-color:#ef44441a;color:#ef4444}.dashboard-profile{display:flex;align-items:center;gap:1.5rem;margin-bottom:2rem;padding:2rem;background:var(--surface-color);border-radius:1rem;border:1px solid var(--border-color)}.profile-img{width:80px;height:80px;border-radius:50%;object-fit:cover;border:2px solid var(--primary-color)}.profile-info h2{font-size:1.5rem;font-weight:700;margin-bottom:.25rem}.profile-info p{color:var(--text-secondary)}.sheet-report-card{background:var(--surface-color);border:1px solid var(--border-color);border-radius:1rem;padding:1.5rem;margin-bottom:1.5rem}.sheet-report-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.sheet-report-header h3{font-size:1.25rem;font-weight:700}.progress-bar-container{width:100%;height:8px;background-color:var(--bg-color);border-radius:4px;overflow:hidden;margin-bottom:1rem}.progress-bar-fill{height:100%;background-color:var(--primary-color);transition:width .5s ease}.action-icon{color:var(--text-secondary);cursor:pointer;transition:color .2s}.action-icon:hover{color:var(--primary-color)}.action-icon.active{color:var(--revision-color)}.hover-scale:hover{transform:scale(1.15)}.admin-dashboard{padding:.5rem 0;max-width:1400px}.admin-header{display:flex;align-items:flex-start;justify-content:space-between;margin-bottom:2rem}.admin-title{font-size:2rem;font-weight:800;background:linear-gradient(135deg,#8ab4f8,#3ddc84);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.admin-subtitle{color:var(--text-secondary);font-size:.9rem;margin-top:.25rem}.admin-badge{background:linear-gradient(135deg,#8ab4f8,#3ddc84);color:#000;font-size:.78rem;font-weight:700;padding:.35rem .9rem;border-radius:2rem;letter-spacing:.05em;text-transform:uppercase;white-space:nowrap}.admin-tabs{display:flex;gap:.5rem;margin-bottom:2rem;border-bottom:1px solid var(--border-color);padding-bottom:.5rem}.admin-tab{background:transparent;border:none;color:var(--text-secondary);font-size:1rem;font-weight:600;padding:.5rem 1rem;cursor:pointer;border-radius:.5rem;transition:all .2s}.admin-tab:hover{background:var(--surface-color);color:var(--text-primary)}.admin-tab.active{background:#8ab4f826;color:var(--primary-color)}.admin-filter-toggles{display:flex;gap:.5rem;margin-right:auto}.filter-toggle-btn{background:var(--surface-color);border:1px solid var(--border-color);color:var(--text-secondary);font-size:.85rem;font-weight:600;padding:.4rem .8rem;border-radius:2rem;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:.4rem}.filter-toggle-btn:hover{border-color:var(--text-secondary)}.filter-toggle-btn.active{background:#3ddc8426;border-color:#3ddc84;color:#3ddc84}.admin-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:1.25rem;margin-bottom:2.5rem}.admin-stat-card{background:var(--surface-color);border:1px solid var(--border-color);border-top:4px solid var(--border-color);border-radius:1rem;padding:1.5rem 1.25rem;display:flex;flex-direction:column;align-items:center;text-align:center;transition:transform .2s,box-shadow .2s;box-shadow:var(--shadow-sm)}.admin-stat-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.admin-stat-icon{width:3rem;height:3rem;border-radius:.75rem;display:flex;align-items:center;justify-content:center;font-size:1.4rem;margin-bottom:.75rem}.admin-stat-value{font-size:2rem;font-weight:800;line-height:1;margin-bottom:.4rem}.admin-stat-label{font-size:.75rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em}.admin-section{background:var(--surface-color);border:1px solid var(--border-color);border-radius:1rem;padding:1.75rem;margin-bottom:2rem;box-shadow:var(--shadow-sm)}.admin-section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.25rem;flex-wrap:wrap;gap:1rem}.admin-section-title{font-size:1.15rem;font-weight:700;margin-bottom:1.25rem}.admin-section-header .admin-section-title{margin-bottom:0}.admin-topic-chart{display:flex;flex-direction:column;gap:.85rem}.admin-topic-row{display:flex;align-items:center;gap:1rem}.admin-topic-name-wrap{width:140px;display:flex;flex-direction:column;align-items:flex-end;flex-shrink:0}.admin-topic-name{font-size:.85rem;font-weight:600;color:var(--text-secondary)}.admin-topic-subtext{font-size:.7rem;color:var(--text-secondary);margin-top:.15rem}.admin-topic-bar-track{flex:1;height:10px;background:var(--bg-color);border-radius:5px;overflow:hidden}.admin-topic-bar-fill{height:100%;background:linear-gradient(90deg,#8ab4f8,#3ddc84);border-radius:5px;transition:width .6s cubic-bezier(.4,0,.2,1);min-width:4px}.admin-topic-count{font-size:.85rem;font-weight:700;color:var(--text-primary);min-width:36px;text-align:right}.admin-controls{display:flex;gap:.75rem;flex-wrap:wrap}.admin-search{background:var(--bg-color);border:1px solid var(--border-color);color:var(--text-primary);border-radius:.5rem;padding:.45rem .9rem;font-size:.875rem;outline:none;transition:border-color .2s;width:220px}.admin-search:focus{border-color:var(--primary-color)}.admin-select{background:var(--bg-color);border:1px solid var(--border-color);color:var(--text-primary);border-radius:.5rem;padding:.45rem .9rem;font-size:.875rem;outline:none;cursor:pointer;transition:border-color .2s}.admin-select:focus{border-color:var(--primary-color)}.admin-table-wrapper{overflow-x:auto;border-radius:.75rem;border:1px solid var(--border-color)}.admin-table{width:100%;border-collapse:collapse;font-size:.875rem}.admin-table th{padding:1rem 1.25rem;text-align:left;font-size:.75rem;font-weight:700;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;background:var(--bg-color);border-bottom:1px solid var(--border-color);white-space:nowrap}.admin-table td{padding:1rem 1.25rem;border-bottom:1px solid var(--border-color);vertical-align:middle}.admin-table tr:last-child td{border-bottom:none}.admin-table tr{transition:background-color .15s}.admin-table tr:hover td{background-color:var(--surface-hover)}.admin-row-active td{background-color:#3ddc840d}.admin-row-active:hover td{background-color:#3ddc841a}.admin-row-online td{background-color:#34d39914}.admin-row-online:hover td{background-color:#34d39926}.admin-online-indicator{position:absolute;bottom:0;right:0;width:12px;height:12px;background-color:#34d399;border-radius:50%;border:2px solid var(--surface-color);animation:pulse-online 2s infinite}@keyframes pulse-online{0%{box-shadow:0 0 #34d399b3}70%{box-shadow:0 0 0 6px #34d39900}to{box-shadow:0 0 #34d39900}}.admin-status-badge{font-size:.7rem;font-weight:700;padding:.25rem .6rem;border-radius:1rem;text-transform:uppercase;letter-spacing:.05em;white-space:nowrap}.admin-status-badge.online{background:#34d39926;color:#34d399;box-shadow:0 0 8px #34d39933}.admin-status-badge.active-today{background:#3ddc8426;color:#3ddc84}.admin-status-badge.offline{background:var(--surface-hover);color:var(--text-secondary)}.admin-user-cell{display:flex;align-items:center;gap:.75rem}.admin-avatar{width:36px;height:36px;border-radius:50%;object-fit:cover;border:2px solid var(--border-color);flex-shrink:0}.admin-avatar-placeholder{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#8ab4f8,#3ddc84);color:#000;font-weight:700;font-size:.9rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}.admin-user-name{font-weight:600;color:var(--text-primary);white-space:nowrap}.admin-user-email{font-size:.75rem;color:var(--text-secondary);white-space:nowrap}.admin-sheet-cell{text-align:center}.admin-total-cell{font-weight:700;color:var(--primary-color);text-align:center}.admin-time-cell{color:var(--text-secondary);font-size:.8rem;white-space:nowrap}.admin-solved-badge{background:#8ab4f826;color:var(--primary-color);font-weight:700;font-size:.8rem;padding:.2rem .55rem;border-radius:.35rem}.admin-table-progress{display:flex;flex-direction:column;gap:.25rem;width:80px;margin:0 auto}.admin-table-progress-text{display:flex;justify-content:center;align-items:baseline;gap:.4rem}.admin-table-progress-pct{font-size:.7rem;color:var(--text-secondary);font-weight:600}.admin-table-progress-bar{height:4px;background-color:var(--bg-color);border-radius:2px;overflow:hidden;width:100%}.admin-table-progress-fill{height:100%;background:linear-gradient(90deg,#8ab4f8,#3ddc84);border-radius:2px}.admin-zero{color:var(--border-color)}.admin-rank-cell{font-size:1.25rem;font-weight:800;color:var(--text-secondary);text-align:center;width:60px}.activity-high{color:#34d399;font-weight:600}.activity-medium{color:#fbbf24;font-weight:600}.activity-low{color:#ef4444;font-weight:600}.activity-normal{color:var(--text-primary)}.activity-never{color:var(--text-secondary)}.admin-access-denied,.admin-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:50vh;text-align:center;gap:1rem}.admin-lock{font-size:4rem;margin-bottom:.5rem}.admin-access-denied h2{font-size:1.75rem;font-weight:700}.admin-access-denied p{color:var(--text-secondary);font-size:1rem}.admin-uid-hint{margin-top:.5rem;font-size:.85rem}.admin-uid-hint code{background:var(--surface-color);border:1px solid var(--border-color);padding:.2rem .5rem;border-radius:.35rem;font-family:monospace;font-size:.8rem;color:var(--primary-color);word-break:break-all}.admin-spinner{width:40px;height:40px;border:3px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:admin-spin .8s linear infinite}@keyframes admin-spin{to{transform:rotate(360deg)}}.custom-checkbox{width:22px;height:22px;border-radius:6px;border:2px solid var(--border-color);background:transparent;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s cubic-bezier(.34,1.56,.64,1);color:transparent;padding:0;flex-shrink:0}.custom-checkbox:hover:not(.disabled){border-color:#3ddc84;background:#3ddc8414;transform:scale(1.1)}.custom-checkbox.checked{background:#3ddc84;border-color:#3ddc84;color:#000;animation:checkbox-pop .35s cubic-bezier(.34,1.56,.64,1);box-shadow:0 0 12px #3ddc8480}.custom-checkbox.checked:hover{background:#3ddc84b3;border-color:#3ddc84b3;box-shadow:none}.custom-checkbox.disabled{cursor:not-allowed;opacity:.4}@keyframes checkbox-pop{0%{transform:scale(.6)}60%{transform:scale(1.25)}to{transform:scale(1)}}.q-row-done{background:#3ddc840a;animation:row-flash .5s ease}@keyframes row-flash{0%{background:#3ddc842e}to{background:#3ddc840a}}.group-complete{animation:group-glow-in .6s ease}@keyframes group-glow-in{0%{box-shadow:0 0 0 3px #3ddc8480}to{box-shadow:0 0 0 1px #3ddc8426}}.desktop-only{display:flex}.mobile-only,.mobile-menu-btn{display:none}.desktop-sidebar{display:flex;flex-direction:column}.mobile-sidebar{display:none}.sidebar-backdrop{display:none;position:fixed;top:0;right:0;bottom:0;left:0;z-index:199;background:#0000008c;backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px);animation:backdrop-in .2s ease}@keyframes backdrop-in{0%{opacity:0}to{opacity:1}}@media (max-width: 768px){.header{padding:0 1rem;height:60px}:root{--header-height: 60px}.mobile-menu-btn{display:flex;margin-right:.25rem}.header-left{display:flex;align-items:center;gap:.25rem}.header-left .logo{font-size:1.2rem}.btn-label,.support-btn{display:none}.dashboard-btn{padding:.5rem;min-width:unset}.header-right{gap:.5rem}.main-layout{position:relative;overflow:hidden}.desktop-sidebar{display:none!important}.mobile-sidebar{display:flex;flex-direction:column;position:fixed;top:60px;left:0;bottom:0;width:280px;z-index:200;transform:translate(-100%);transition:transform .28s cubic-bezier(.4,0,.2,1);background:var(--surface-color);border-right:1px solid var(--border-color);overflow-y:auto;padding:1.5rem 0;box-shadow:4px 0 24px #0000004d}.mobile-sidebar.mobile-open{transform:translate(0)}.sidebar-backdrop{display:block}.desktop-only{display:none!important}.mobile-only{display:flex!important}.main-content{padding:1rem;width:100%}.sheet-header h1{font-size:1.5rem}.sheet-header p{font-size:.95rem}.stats-grid{grid-template-columns:repeat(2,1fr);gap:.75rem;margin-bottom:1.25rem}.stat-card{padding:1rem .75rem}.stat-value{font-size:1.4rem}.filter-tabs{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:4px;scrollbar-width:none}.filter-tabs::-webkit-scrollbar{display:none}.accordion-header{padding:.85rem 1rem;font-size:.95rem}.accordion-body{overflow-x:auto;-webkit-overflow-scrolling:touch}.questions-table th,.questions-table td{padding:.65rem .75rem;font-size:.85rem;white-space:nowrap}.admin-dashboard{padding:0}.admin-title{font-size:1.4rem}.admin-stats-grid{grid-template-columns:repeat(2,1fr);gap:.75rem}.admin-stat-value{font-size:1.5rem}.admin-section{padding:1rem}.admin-topic-name{width:90px;font-size:.75rem}.admin-controls{flex-direction:column}.admin-search,.admin-select{width:100%}.dashboard-profile{flex-direction:column;text-align:center;padding:1.25rem;gap:1rem}.profile-img{width:64px;height:64px}}@media (max-width: 480px){.header-left .logo{font-size:1rem}.stats-grid{grid-template-columns:repeat(2,1fr);gap:.5rem}.admin-stats-grid{grid-template-columns:repeat(2,1fr)}.main-content{padding:.75rem}.sheet-header h1{font-size:1.25rem}.admin-topic-name{width:70px;font-size:.7rem}}