:root{--walnut-dark: #2A1D16;--walnut: #3E2A1E;--walnut-light: #5C4030;--brass: #C9A227;--brass-bright: #E4C34E;--felt: #2F4538;--parchment: #EDE4D3;--parchment-dim: #C9BCA3;--ember: #A8412C;--ink: #1B140F;--light-sq: #E9D9BB;--dark-sq: #8B6444;--sq-select: rgba(201,162,39,.55);--sq-move: rgba(47,69,56,.55)}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at top,#4a3223 0%,var(--walnut-dark) 60%);color:var(--parchment);font-family:Inter,sans-serif;min-height:100vh}.wrap{max-width:1180px;margin:0 auto;padding:28px 20px 60px}header.hero{display:flex;align-items:center;justify-content:space-between;padding-bottom:22px;margin-bottom:18px;border-bottom:1px solid rgba(201,162,39,.25)}.brand{display:flex;align-items:center;gap:14px}.brand-mark{width:46px;height:46px;display:flex;align-items:center;justify-content:center;filter:drop-shadow(0 2px 4px rgba(0,0,0,.5))}.brand-mark img{width:100%;height:100%;object-fit:contain}.brand h1{font-family:Playfair 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12px;font-size:11.5px}.challenge-status{font-size:11px;text-transform:uppercase;letter-spacing:.4px;font-weight:700;padding:2px 8px;border-radius:20px}.challenge-status-open{color:var(--brass-bright);background:#c9a22726}.challenge-status-accepted{color:#6fbf73;background:#6fbf7326}.challenge-status-declined,.challenge-status-cancelled{color:var(--parchment-dim);background:#ffffff0f}.install-fab{position:fixed;right:20px;bottom:20px;z-index:80;display:flex;align-items:center;gap:8px;padding:12px 18px;border-radius:30px;border:none;cursor:pointer;background:linear-gradient(135deg,var(--brass-bright),var(--brass) 60%,#8a6c1a);color:var(--ink);font-weight:700;font-size:13.5px;font-family:Inter,sans-serif;box-shadow:0 8px 24px #00000080,inset 0 1px #fff6;transition:transform .15s ease}.install-fab:hover{transform:translateY(-2px)}.install-fab svg{width:18px;height:18px;flex-shrink:0}@media (max-width: 480px){.install-fab{right:14px;bottom:14px;padding:12px;border-radius:50%}.install-fab 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