:root{--primary-blue:#2c5f8c;--secondary-blue:#3a7ca5;--accent-blue:#4a9cc9;--accent-orange:#e8a838;--gold:#f5a623;--bg-primary:#0d1117;--bg-secondary:#161b22;--bg-card:#21262d;--bg-highlight:#011225;--text-primary:#f0f6fc;--text-secondary:#8b949e;--text-muted:#6e7681;--success:#3fb950;--error:#f85149;--warning:#d29922;--glass-bg:#161b22cc;--glass-border:#30363d80;--gradient-primary:linear-gradient(135deg,#2c5f8c 0%,#3a7ca5 100%);--gradient-accent:linear-gradient(135deg,#e8a838 0%,#f5a623 100%);--gradient-card:linear-gradient(145deg,#161b22 0%,#21262d 100%);--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 4px 16px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow:0 0 20px #3a7ca54d;--transition-fast:.15s ease;--transition-normal:.3s ease;--transition-slow:.5s ease;--space-xs:.25rem;--space-sm:.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--font-sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;overflow-x:hidden}h1,h2,h3,h4,h5,h6{margin-bottom:var(--space-md);font-weight:700;line-height:1.2}h1{font-size:2.5rem}h2{font-size:2rem}h3{font-size:1.5rem}h4{font-size:1.25rem}p{margin-bottom:var(--space-md);color:var(--text-secondary)}a{color:var(--accent-blue);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--secondary-blue)}.btn{justify-content:center;align-items:center;gap:var(--space-sm);padding:var(--space-sm)var(--space-lg);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-normal);border:none;min-height:48px;font-size:1rem;font-weight:600;display:inline-flex}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover{box-shadow:var(--shadow-glow);transform:translateY(-2px)}.btn-accent{background:var(--gradient-accent);color:var(--bg-primary)}.btn-ghost{color:var(--text-primary);border:1px solid var(--glass-border);background:0 0}.btn-ghost:hover{background:var(--bg-highlight)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.card{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);padding:var(--space-lg);transition:all var(--transition-normal)}.card:hover{border-color:var(--secondary-blue);box-shadow:var(--shadow-glow)}.input{width:100%;padding:var(--space-md);background:var(--bg-secondary);border:1px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-primary);transition:all var(--transition-fast);font-size:1rem}.input:focus{border-color:var(--secondary-blue);outline:none;box-shadow:0 0 0 3px #3a7ca533}.input::placeholder{color:var(--text-muted)}.form-group{margin-bottom:var(--space-lg)}.form-label{margin-bottom:var(--space-sm);color:var(--text-secondary);font-weight:500;display:block}.container{width:100%;max-width:1200px;padding:0 var(--space-lg);margin:0 auto}.grid{gap:var(--space-lg);display:grid}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (max-width:768px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.flex{gap:var(--space-md);display:flex}.flex-center{justify-content:center;align-items:center;display:flex}.flex-between{justify-content:space-between;align-items:center;display:flex}.text-center{text-align:center}.text-gold{color:var(--gold)}.text-success{color:var(--success)}.text-error{color:var(--error)}.mt-1{margin-top:var(--space-md)}.mt-2{margin-top:var(--space-xl)}.mb-1{margin-top:var(--space-md)}.mb-2{margin-bottom:var(--space-xl)}.badge{padding:var(--space-xs)var(--space-sm);border-radius:var(--radius-full);align-items:center;font-size:.75rem;font-weight:600;display:inline-flex}.badge-primary{background:var(--primary-blue);color:#fff}.badge-gold{background:var(--gold);color:var(--bg-primary)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.animate-fadeIn{animation:.5s fadeIn}.animate-slideUp{animation:.5s slideUp}.animate-pulse{animation:2s ease-in-out infinite pulse}.animate-float{animation:3s ease-in-out infinite float}.no-select{-webkit-user-select:none;user-select:none}.progress-bar{background:var(--bg-highlight);border-radius:var(--radius-full);width:100%;height:8px;overflow:hidden}.progress-fill{background:var(--gradient-primary);height:100%;transition:width var(--transition-normal)}.podium{justify-content:center;align-items:flex-end;gap:var(--space-md);padding:var(--space-xl)0;display:flex}.podium-item{padding:var(--space-lg);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-lg);transition:all var(--transition-normal);flex-direction:column;align-items:center;display:flex}.podium-first{border-color:var(--gold);background:linear-gradient(135deg,#f5a62333 0%,#e8a8381a 100%);transform:scale(1.1)}.podium-second{background:linear-gradient(135deg,#c0c0c033 0%,#a9a9a91a 100%);border-color:silver}.podium-third{background:linear-gradient(135deg,#cd7f3233 0%,#b873331a 100%);border-color:#cd7f32}.spinner{border:3px solid var(--bg-highlight);border-top-color:var(--secondary-blue);border-radius:50%;width:40px;height:40px;animation:1s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.toast{bottom:var(--space-xl);right:var(--space-xl);padding:var(--space-md)var(--space-lg);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:1000;animation:.3s slideUp;position:fixed}.option{width:100%;padding:var(--space-md)var(--space-lg);background:var(--bg-secondary);border:2px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-primary);text-align:left;cursor:pointer;transition:all var(--transition-fast);font-size:1rem;display:block}.option:hover{border-color:var(--secondary-blue);background:var(--bg-highlight)}.option.selected{border-color:var(--secondary-blue);background:#3a7ca533}.option.correct{border-color:var(--success);background:#3fb95033}.option.incorrect{border-color:var(--error);background:#f8514933}