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:root{--background:#0d1117;--foreground:#c9d1d9;--card-bg:#161b22;--border:#30363d;--accent:#58a6ff;--accent-glow:#58a6ff33;--success:#238636;--success-glow:#2386364d;--error:#da3633;--error-glow:#da36334d}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--background);color:var(--foreground);font-family:var(--font-inter), -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;line-height:1.5;overflow-x:hidden}body:before{content:"";z-index:-1;pointer-events:none;background:radial-gradient(circle,#58a6ff1f 0%,#bc8cff14 25%,#0000 60%);width:300%;height:300%;animation:30s linear infinite drift;position:fixed;top:-100%;left:-100%}@keyframes drift{0%{transform:rotate(0)}to{transform:rotate(360deg)}}main{flex-direction:column;align-items:center;max-width:1000px;min-height:100vh;margin:0 auto;padding:2rem;display:flex;position:relative}h1{background:linear-gradient(135deg,#58a6ff,#bc8cff);-webkit-text-fill-color:transparent;letter-spacing:-.02em;-webkit-background-clip:text;font-size:2.5rem;font-weight:800}.code-container{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border:1px solid var(--border);width:100%;font-family:var(--font-fira-code), monospace;background:#161b22cc;border-radius:12px;min-height:200px;max-height:42vh;margin-bottom:1rem;padding:1.5rem;font-size:.9rem;transition:border-color .3s;overflow:auto;box-shadow:0 10px 30px #0000004d}.code-container:hover{border-color:var(--accent)}.options-grid{grid-template-columns:1fr 1fr;gap:1.25rem;width:100%;display:grid}button{background:var(--card-bg);color:var(--foreground);border:1px solid var(--border);cursor:pointer;border-radius:10px;padding:1.25rem;font-size:1rem;font-weight:500;transition:all .2s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}button:hover:not(:disabled){border-color:var(--accent);box-shadow:0 4px 20px var(--accent-glow);background:#1f242c;transform:translateY(-2px)}button:active:not(:disabled){transform:translateY(0)}button.correct{background:var(--success);border-color:var(--success);color:#fff;box-shadow:0 0 20px var(--success-glow);animation:1s ease-out pulse-success}button.incorrect{background:var(--error);border-color:var(--error);color:#fff;box-shadow:0 0 20px var(--error-glow);animation:.4s ease-in-out shake}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}50%{transform:translate(4px)}75%{transform:translate(-4px)}}@keyframes pulse-success{0%{transform:scale(1)}50%{transform:scale(1.03)}to{transform:scale(1)}}.spinner{border:4px solid #58a6ff1a;border-left-color:var(--accent);border-radius:50%;width:48px;height:48px;animation:1s cubic-bezier(.5,.1,.4,.9) infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.skeleton-container{flex-direction:column;gap:.75rem;min-height:200px;padding:1.5rem;display:flex}.skeleton-line{background:linear-gradient(90deg,#1f242c 25%,#2d333b 50%,#1f242c 75%) 0 0/200% 100%;border-radius:4px;height:.9rem;animation:1.5s ease-in-out infinite shimmer}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@media (max-width:600px){.options-grid{grid-template-columns:1fr}main{padding:1.5rem 1rem}.code-container{min-height:150px;max-height:32vh}h1{font-size:2rem}.header-right{gap:.4rem}.header-mobile-hide{display:none}.game-description{margin-bottom:.75rem!important;font-size:.95rem!important}.category-pills{gap:.3rem!important;margin-bottom:.75rem!important}.category-pill{padding:.45rem .9rem!important;font-size:.85rem!important}footer{padding:1rem .5rem!important}}.header-show-mobile{display:none}@media (max-width:600px){.header-show-mobile{display:inline}}.history-backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:10;background:#000000b3;position:fixed;inset:0}.history-drawer{border-left:1px solid var(--border);z-index:11;background:#0d1117;flex-direction:column;width:380px;padding:2rem 1.5rem;display:flex;position:fixed;top:0;bottom:0;right:0;overflow-y:auto;box-shadow:-10px 0 30px #00000080}.history-drawer-header{justify-content:space-between;align-items:center;margin-bottom:2rem;display:flex}.history-drawer-title{color:var(--accent);font-size:1.25rem;font-weight:700}.history-close-btn{color:var(--foreground);cursor:pointer;opacity:.5;background:0 0;border:none;padding:.5rem;font-size:1.25rem;transition:opacity .2s}.history-close-btn:hover{opacity:1}.history-empty{opacity:.5;text-align:center;margin-top:3rem;font-size:.95rem;line-height:1.6}.history-stats-grid{grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:2rem;display:grid}.history-stat{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:.25rem;padding:1rem;display:flex}.history-stat-val{color:#fff;font-size:1.5rem;font-weight:700}.history-stat-label{color:var(--foreground);opacity:.6;text-transform:uppercase;letter-spacing:.05em;font-size:.8rem}.history-divider{border-top:1px solid var(--border);margin:1.5rem 0}.history-section-label{text-transform:uppercase;letter-spacing:.1em;opacity:.4;margin-bottom:1rem;font-size:.75rem;font-weight:600}.history-repo-row{align-items:center;gap:.75rem;margin-bottom:.75rem;font-size:.85rem;display:flex}.history-repo-name{white-space:nowrap;text-overflow:ellipsis;width:140px;color:var(--foreground);flex-shrink:0;font-weight:500;overflow:hidden}.history-bar-wrap{background:var(--border);border-radius:4px;flex:1;height:8px;overflow:hidden}.history-bar{border-radius:4px;height:100%;transition:width .5s cubic-bezier(.4,0,.2,1)}.history-bar--good{background:linear-gradient(90deg,#238636,#2ea043)}.history-bar--bad{background:linear-gradient(90deg,#da3633,#f85149)}.history-repo-pct{text-align:right;opacity:.8;font-variant-numeric:tabular-nums;flex-shrink:0;width:40px;font-size:.8rem}@media (max-width:600px){.history-drawer{width:100vw}}