.challenges-header{margin-top:var(--spacing-2xl)}.challenge-filter-tabs{display:flex;flex-wrap:nowrap;flex:1 1 100%;min-width:0;gap:var(--spacing-sm);background:var(--bg-tertiary);padding:6px;border-radius:var(--radius-md);overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}.challenge-filter-tabs::-webkit-scrollbar{display:none}.challenge-filter-tab{flex:0 0 auto;border:none;background:transparent;color:var(--text-secondary);border-radius:var(--radius-sm);padding:var(--spacing-sm) var(--spacing-lg);font-size:var(--font-size-sm);font-weight:var(--font-weight-bold);cursor:pointer;white-space:nowrap;transition:color var(--transition-base),background-color var(--transition-base),box-shadow var(--transition-base),transform var(--transition-press)}.challenge-filter-tab:hover:not(.challenge-filter-tab-active){color:var(--text-primary)}.challenge-filter-tab-active{background:var(--accent-wash);box-shadow:inset 0 0 0 1px var(--accent-border);color:var(--accent-yellow)}.challenge-filter-tab:active{transform:scale(.97)}.challenges-empty-filtered{text-align:center;padding:var(--spacing-xl) var(--spacing-md);color:var(--text-muted)}.challenges-grid{display:grid;grid-template-columns:1fr;gap:var(--spacing-lg)}@media(min-width:768px){.challenges-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--spacing-lg)}}@media(min-width:1024px){.challenges-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}.challenge-card{position:relative;display:flex;flex-direction:column;min-width:0;background-color:var(--bg-secondary);border:1px solid;border-radius:var(--radius-xl);overflow:hidden}@supports (grid-template-rows: subgrid){.challenges-grid>.challenge-card{display:grid;grid-template-rows:subgrid;grid-row:span 3;row-gap:0}.challenges-grid>.challenge-card>.challenge-card-actions{margin-top:0}}.challenge-card-paid{--glow-tint: 250, 204, 21;border-color:#f59e0b4d}.challenge-card-free{--glow-tint: 16, 185, 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8px}.challenge-category-chip{align-self:flex-start;font-size:var(--font-size-2xs);font-weight:var(--font-weight-bold)}.challenge-description{margin:0;font-size:var(--font-size-xs);line-height:1.625;color:var(--text-secondary)}.challenge-desc-clamp{--card-desc-lines: 3;flex:none;display:-webkit-box;-webkit-line-clamp:var(--card-desc-lines);-webkit-box-orient:vertical;overflow:hidden}@media(min-width:1024px){.challenge-desc-clamp{--card-desc-lines: 4}}.challenge-card-actions{margin-top:auto;padding:0 var(--spacing-lg) 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