.challenge-details-page{background-color:#f9fafb;min-height:100vh;padding:32px}.loading-container{flex-direction:column;justify-content:center;align-items:center;gap:16px;height:100vh;display:flex}.error-container{background:#f9fafb;justify-content:center;align-items:center;min-height:100vh;padding:20px;display:flex}.content-container{flex-direction:column;gap:24px;display:flex}@media (width>=900px){.content-container{flex-direction:row}}.left-column{flex-direction:column;flex:2;gap:24px;display:flex}.right-column{flex-direction:column;flex:1;gap:24px;display:flex}.detail-card{background:#fff;border:1px solid #e5e7eb;border-radius:16px;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 1px 3px #0000001a}.detail-card:hover{box-shadow:0 4px 20px #00000014}.MuiChip-root{border:1px solid #0000;transition:all .2s}.MuiChip-root:hover{transform:translateY(-1px)}.status-active{color:#10b981;background-color:#10b9811a}.status-inactive{color:#6b7280;background-color:#6b72801a}.difficulty-easy{color:#10b981;background-color:#10b9811a}.difficulty-medium{color:#f59e0b;background-color:#f59e0b1a}.difficulty-hard{color:#ef4444;background-color:#ef44441a}.MuiTable-root{border-collapse:separate;border-spacing:0}.MuiTableRow-root{transition:background-color .15s}.MuiTableCell-root{border-bottom:1px solid #e5e7eb;transition:background-color .15s}.MuiTableRow-head .MuiTableCell-root{color:#374151;letter-spacing:.025em;background-color:#f8fafc;font-weight:500}.progress-bar{background-color:#e5e7eb;border-radius:3px;width:100%;height:6px;overflow:hidden}.progress-fill{border-radius:3px;height:100%;transition:width .3s}.MuiButton-root{letter-spacing:.01em;transition:all .2s}.MuiButton-contained{box-shadow:0 1px 2px #0000000d}.MuiButton-contained:hover{box-shadow:0 4px 6px #00000012}.MuiIconButton-root{border-radius:8px;transition:all .2s}.MuiOutlinedInput-root{transition:all .2s}.MuiOutlinedInput-root:hover .MuiOutlinedInput-notchedOutline{border-color:#9ca3af}.MuiOutlinedInput-root.Mui-focused .MuiOutlinedInput-notchedOutline{border-width:1px;border-color:#3b82f6}@media (width<=768px){.challenge-details-page{padding:16px}.content-container{gap:16px}.left-column,.right-column{width:100%}.MuiTableCell-root{padding:12px 8px;font-size:.875rem}.MuiTypography-h4{font-size:1.25rem}}@media (width<=480px){.challenge-details-page{padding:12px}.detail-card{border-radius:12px}.challenge-header{flex-direction:column;align-items:flex-start;gap:12px}}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.detail-card{animation:.3s ease-out fadeIn}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:#f1f1f1;border-radius:3px}::-webkit-scrollbar-thumb{background:#9ca3af;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#6b7280}:focus-visible{outline-offset:2px;outline:2px solid #3b82f6}::selection{color:#1e40af;background-color:#3b82f61a}.empty-state{opacity:.5;transition:opacity .2s}.empty-state:hover{opacity:.7}.activity-card{border-left:3px solid;transition:all .2s}.activity-card:hover{transform:translate(4px);box-shadow:0 2px 8px #0000001a}.price-display{color:#1e40af;align-items:center;gap:4px;font-weight:600;display:inline-flex}.duration-display{color:#6b7280;align-items:center;gap:6px;display:inline-flex}.progress-indicator{align-items:center;gap:8px;display:flex}.progress-text{text-align:right;min-width:40px;font-weight:500}.participant-completed{color:#10b981;background-color:#10b9811a}.participant-in-progress{color:#3b82f6;background-color:#3b82f61a}.participant-not-started{color:#6b7280;background-color:#6b72801a}.MuiButton-root,.MuiIconButton-root,.MuiChip-root,.detail-card,.activity-card{will-change:transform,box-shadow,background-color}.stats-summary{border-top:1px solid #e5e7eb;justify-content:space-between;margin-top:16px;padding:12px 0;display:flex}.stats-item{text-align:center;flex:1}.stats-value{font-size:1.1rem;font-weight:600;display:block}.stats-label{color:#6b7280;font-size:.75rem;display:block}