:root{--bg-page:#0f0f13;--bg-card:#1a1a24;--bg-elevated:#2a2a3a;--bg-input:#1a1a24;--border:#2a2a3a;--border-hover:#3a3a4a;--accent:#6366f1;--accent-2:#8b5cf6;--accent-gradient:linear-gradient(135deg, #6366f1, #8b5cf6);--text:#fff;--text-muted:#666;--text-secondary:#888;--text-accent:#a78bfa;--success:#4ade80;--success-bg:#1a3a2a;--danger:#f87171;--danger-bg:#3a1a1a;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--shadow-card:0 4px 24px #00000040;--transition:.18s ease;--font:"Inter", system-ui, -apple-system, sans-serif;--focus-ring:0 0 0 2px var(--bg-page), 0 0 0 4px var(--accent)}*,:before,:after{box-sizing:border-box}body{font-family:var(--font);background:var(--bg-page);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0}#root{min-height:100svh}a{color:inherit}button{font-family:inherit}button:focus-visible,a:focus-visible,input:focus-visible{box-shadow:var(--focus-ring);outline:none}.page{background:var(--bg-page);min-height:100vh;color:var(--text);padding:24px 16px 48px}.page--centered{justify-content:center;align-items:center;display:flex}.wrap{max-width:900px;margin:0 auto}.wrap--narrow{max-width:420px}.card{background:var(--bg-card);border-radius:var(--radius-xl);border:1px solid var(--border);transition:border-color var(--transition), box-shadow var(--transition);margin-bottom:24px;padding:28px}.card--flat{margin-bottom:0}.card--clickable{cursor:pointer}.card--clickable:hover{border-color:var(--border-hover)}.card--compact{padding:16px 24px}.input-row{flex-direction:column;gap:6px;margin-bottom:16px;display:flex}.input-row label{color:var(--text-muted);padding-left:4px;font-size:.8rem;font-weight:600}.input-field-wrap{background:var(--bg-input);border-radius:var(--radius-lg);border:1px solid var(--border);transition:border-color var(--transition);align-items:center;padding:4px 8px;display:flex}.input-field-wrap:focus-within{border-color:var(--accent)}.input-field{color:var(--text);background:0 0;border:none;outline:none;flex:1;min-width:0;padding:10px 12px;font-size:1rem}.input-toggle{color:var(--text-muted);cursor:pointer;border-radius:var(--radius-sm);transition:color var(--transition);background:0 0;border:none;padding:8px 12px;font-size:.8rem;font-weight:600}.input-toggle:hover{color:var(--text-accent)}.btn{border-radius:var(--radius-md);cursor:pointer;transition:opacity var(--transition), transform var(--transition), box-shadow var(--transition);border:none;font-size:1rem;font-weight:600}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.btn-primary{background:var(--accent-gradient);color:#fff;padding:12px 28px}.btn-primary:not(:disabled):hover{opacity:.92;transform:translateY(-1px)}.btn-primary--block{width:100%;padding:14px}.btn-ghost{border:1px solid var(--border);color:var(--text-muted);background:0 0;padding:8px 16px;font-size:.9rem}.btn-ghost:not(:disabled):hover{border-color:var(--border-hover);color:var(--text)}.btn-ghost--accent{color:var(--text-accent)}.btn-ghost--success{color:var(--success)}.btn-sm{border-radius:var(--radius-sm);padding:6px 14px;font-size:.85rem}.segmented{background:var(--bg-page);border-radius:var(--radius-md);gap:8px;margin-bottom:24px;padding:4px;display:flex}.segmented button{cursor:pointer;color:var(--text-muted);transition:all var(--transition);background:0 0;border:none;border-radius:10px;flex:1;padding:10px;font-size:.95rem;font-weight:600}.segmented button.active{background:var(--accent-gradient);color:#fff}.title-gradient{background:var(--accent-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin:0;font-size:2rem;font-weight:800}.title-gradient--lg{font-size:2.5rem}.subtitle{color:var(--text-muted);margin:8px 0 0}.error-text{color:var(--danger);margin-bottom:16px;font-size:.9rem}.hint-text{color:var(--text-muted);margin-top:8px;font-size:.85rem}.app-header{z-index:100;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#0f0f13d9;border-bottom:1px solid #0000;margin:-24px -16px 32px;padding:16px 16px 12px;position:sticky;top:0}.app-header--scrolled{border-bottom-color:var(--border)}.header-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;max-width:900px;margin:0 auto;display:flex}.header-brand{cursor:pointer;background:0 0;background-image:var(--accent-gradient);-webkit-text-fill-color:transparent;color:#0000;-webkit-background-clip:text;background-clip:text;border:none;padding:0;font-size:1.35rem;font-weight:800}.nav-tabs{flex-wrap:wrap;gap:4px;display:flex}.nav-tab{border-radius:var(--radius-sm);color:var(--text-muted);cursor:pointer;transition:color var(--transition), background var(--transition);background:0 0;border:none;padding:8px 14px;font-size:.88rem;font-weight:600;position:relative}.nav-tab:hover{color:var(--text);background:var(--bg-elevated)}.nav-tab.active{color:#fff;background:var(--accent-gradient)}.nav-badge{background:var(--success);color:#000;border-radius:999px;justify-content:center;align-items:center;min-width:18px;height:18px;margin-left:6px;padding:0 5px;font-size:.7rem;font-weight:700;display:inline-flex}.header-actions{align-items:center;gap:8px;display:flex}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:16px;margin-bottom:24px;display:grid}.stat-box{background:var(--bg-card);border-radius:var(--radius-lg);border:1px solid var(--border);text-align:center;transition:border-color var(--transition);padding:20px}.stat-box:hover{border-color:var(--border-hover)}.stat-label{color:var(--text-muted);margin-bottom:8px;font-size:.85rem}.stat-value{color:var(--accent);font-size:1.8rem;font-weight:700}.stat-value--rank{color:inherit}.profile-card{flex-wrap:wrap;align-items:center;gap:20px;display:flex}.profile-avatar{border:3px solid var(--accent);object-fit:cover;border-radius:50%;width:72px;height:72px}.profile-meta h2{margin:0 0 4px;font-size:1.5rem;font-weight:700}.profile-rank{text-transform:capitalize;font-weight:600}.profile-sub{color:var(--text-muted);margin-top:6px;font-size:.85rem}.profile-link{color:var(--text-accent);border:1px solid var(--border);border-radius:var(--radius-sm);transition:border-color var(--transition), background var(--transition);margin-left:auto;padding:8px 14px;font-size:.9rem;text-decoration:none}.profile-link:hover{border-color:var(--accent);background:#6366f114}.tag-list{flex-wrap:wrap;gap:12px;display:flex}.tag{background:var(--bg-elevated);border-radius:var(--radius-sm);color:var(--text-accent);padding:8px 16px;font-size:.9rem}.tag-count{color:var(--text-muted);margin-left:6px;font-size:.8rem}.resource-link{color:var(--accent);background:var(--bg-elevated);border-radius:var(--radius-sm);transition:background var(--transition), transform var(--transition);padding:8px 12px;font-size:.9rem;text-decoration:none;display:inline-block}.resource-link:hover{background:var(--border-hover);transform:translate(2px)}.problem-card{background:var(--bg-elevated);border-radius:var(--radius-md);color:var(--text);border:1px solid var(--border);transition:border-color var(--transition), transform var(--transition), box-shadow var(--transition);justify-content:space-between;align-items:center;gap:12px;padding:16px;text-decoration:none;display:flex}.problem-card:hover{border-color:var(--accent);box-shadow:var(--shadow-card);transform:translateY(-2px)}.problem-card__tags{color:var(--text-secondary);margin-top:4px;font-size:.85rem}.rating-badge{flex-shrink:0;font-weight:700}.chart-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px;display:flex}.chart-header h3{margin:0;font-weight:600}.chart-legend{flex-wrap:wrap;gap:12px;margin-top:12px;font-size:.75rem;display:flex}.chart-legend-item{color:var(--text-muted);align-items:center;gap:6px;display:flex}.chart-legend-dot{border-radius:2px;width:10px;height:3px}.chart-toggle{gap:6px;display:flex}.chart-toggle button{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;transition:all var(--transition);background:0 0;border-radius:6px;padding:4px 10px;font-size:.78rem;font-weight:600}.chart-toggle button.active{background:var(--accent-gradient);color:#fff;border-color:#0000}.progress-wrap{margin-bottom:16px}.progress-meta{color:var(--text-muted);justify-content:space-between;align-items:center;margin-bottom:8px;font-size:.9rem;display:flex}.progress-bar{background:var(--bg-elevated);border-radius:999px;height:8px;overflow:hidden}.progress-bar__fill{background:var(--accent-gradient);border-radius:999px;height:100%;transition:width .4s}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.skeleton{background:linear-gradient(90deg, var(--bg-elevated) 25%, #334 50%, var(--bg-elevated) 75%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.4s infinite shimmer}.skeleton--circle{border-radius:50%}.skeleton-dashboard{flex-direction:column;gap:24px;display:flex}.skeleton-profile{align-items:center;gap:20px;display:flex}.skeleton-chart{border-radius:var(--radius-lg);height:280px}.empty-state,.error-state{text-align:center;padding:32px 16px}.empty-state__icon{opacity:.6;margin-bottom:12px;font-size:2.5rem}.empty-state h3,.error-state h3{margin:0 0 8px;font-size:1.1rem}.empty-state p,.error-state p{color:var(--text-muted);margin-bottom:16px;font-size:.9rem}.spinner{vertical-align:middle;border:2px solid #ffffff40;border-top-color:#fff;border-radius:50%;width:18px;height:18px;margin-right:8px;animation:.7s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.contest-toolbar{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:20px;display:flex}.contest-search{flex:1;min-width:180px}.contest-summary{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;margin-bottom:20px;display:grid}.summary-pill{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);text-align:center;padding:14px}.summary-pill span{color:var(--text-muted);margin-bottom:4px;font-size:.75rem;display:block}.summary-pill strong{color:var(--accent);font-size:1.2rem}.contest-row__title{white-space:nowrap;text-overflow:ellipsis;margin-bottom:4px;font-size:.95rem;font-weight:600;overflow:hidden}.contest-expand{grid-template-rows:0fr;transition:grid-template-rows .22s;display:grid}.contest-expand.open{grid-template-rows:1fr}.contest-expand-inner{overflow:hidden}.contest-expand-content{border-top:1px solid var(--border);margin-top:20px;padding-top:20px}.chip{transition:opacity var(--transition);border-radius:6px;margin-bottom:6px;margin-right:6px;padding:4px 10px;font-size:.85rem;font-weight:600;text-decoration:none;display:inline-block}.chip:hover{opacity:.85}.chip--solved{background:var(--success-bg);color:var(--success)}.chip--missed{background:var(--danger-bg);color:var(--danger)}.upsolve-row{cursor:pointer;align-items:center;gap:16px;display:flex}.upsolve-row.done{opacity:.5}.upsolve-check{cursor:pointer;color:#000;width:24px;height:24px;transition:border-color var(--transition), background var(--transition);background:0 0;border:2px solid #444;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;font-size:.85rem;font-weight:800;display:flex}.upsolve-check.checked{border-color:var(--success);background:var(--success)}.filter-pills{flex-wrap:wrap;gap:8px;display:flex}.filter-pills button{border-radius:var(--radius-sm);cursor:pointer;background:var(--bg-elevated);color:var(--text-muted);transition:all var(--transition);border:none;padding:6px 14px;font-size:.85rem;font-weight:600}.filter-pills button.active{background:var(--accent-gradient);color:#fff}.sort-select{background:var(--bg-elevated);border:1px solid var(--border);color:var(--text);border-radius:var(--radius-sm);cursor:pointer;padding:6px 10px;font-size:.85rem}.section-title{margin:0 0 16px;font-weight:600}.card-header-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;display:flex}.nav-tabs--scroll{-webkit-overflow-scrolling:touch;flex-wrap:nowrap;max-width:100%;padding-bottom:4px;overflow-x:auto}.heatmap-grid{flex-wrap:wrap;gap:4px;display:flex}.heatmap-cell{border-radius:3px;width:12px;height:12px}@media (width<=640px){.page{padding:16px 12px 40px}.profile-link{text-align:center;width:100%;margin-left:0}.header-inner{flex-direction:column;align-items:stretch}.nav-tabs{order:3;justify-content:stretch;width:100%}.nav-tab{text-align:center;flex:1}.header-actions{justify-content:flex-end;width:100%}}