:root{--bg-primary:#060c18;--bg-secondary:#0d1526;--bg-tertiary:#111827;--bg-card:#111827cc;--bg-card-hover:#192134e6;--bg-glass:#ffffff0a;--bg-glass-hover:#ffffff12;--indigo-400:#818cf8;--indigo-500:#6366f1;--indigo-600:#4f46e5;--amber-400:#fbbf24;--amber-500:#f59e0b;--emerald-400:#34d399;--emerald-500:#10b981;--rose-400:#fb7185;--rose-500:#f43f5e;--cyan-400:#22d3ee;--cyan-500:#06b6d4;--violet-500:#8b5cf6;--orange-500:#f97316;--pink-500:#ec4899;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#475569;--text-accent:#818cf8;--border-subtle:#ffffff0f;--border-default:#ffffff1a;--border-accent:#6366f166;--gradient-brand:linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);--gradient-amber:linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);--gradient-emerald:linear-gradient(135deg, #10b981 0%, #059669 100%);--gradient-hero:linear-gradient(135deg, #060c18 0%, #0d1526 50%, #1a0533 100%);--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 4px 20px #0006;--shadow-lg:0 8px 40px #00000080;--shadow-glow:0 0 40px #6366f133;--shadow-glow-amber:0 0 40px #f59e0b26;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--transition-fast:.15s ease;--transition-base:.25s ease;--transition-slow:.4s cubic-bezier(.4, 0, .2, 1);--nav-height:72px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.6;overflow-x:hidden}h1,h2,h3,h4,h5,h6{letter-spacing:-.02em;font-family:Plus Jakarta Sans,sans-serif;font-weight:700;line-height:1.25}h1{font-size:clamp(2.25rem,5vw,3.75rem)}h2{font-size:clamp(1.75rem,3vw,2.5rem)}h3{font-size:clamp(1.25rem,2vw,1.75rem)}h4{font-size:1.25rem}p{color:var(--text-secondary);line-height:1.7}a{color:inherit;text-decoration:none}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.section{padding:5rem 0}.gradient-text{background:var(--gradient-brand);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.gradient-text-amber{background:var(--gradient-amber);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.btn{border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);white-space:nowrap;border:none;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-family:Plus Jakarta Sans,sans-serif;font-size:.95rem;font-weight:600;text-decoration:none;display:inline-flex;position:relative;overflow:hidden}.btn:active{transform:scale(.97)}.btn-primary{background:var(--gradient-brand);color:#fff;box-shadow:0 4px 20px #6366f159}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 30px #6366f180}.btn-secondary{background:var(--bg-glass);color:var(--text-primary);border:1px solid var(--border-default);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.btn-secondary:hover{background:var(--bg-glass-hover);border-color:var(--border-accent);transform:translateY(-1px)}.btn-amber{background:var(--gradient-amber);color:#fff;box-shadow:0 4px 20px #f59e0b4d}.btn-amber:hover{transform:translateY(-1px);box-shadow:0 6px 30px #f59e0b73}.btn-ghost{color:var(--text-secondary);background:0 0;border:1px solid #0000}.btn-ghost:hover{background:var(--bg-glass);color:var(--text-primary);border-color:var(--border-subtle)}.btn-sm{border-radius:var(--radius-sm);padding:.5rem 1rem;font-size:.875rem}.btn-lg{border-radius:var(--radius-lg);padding:1rem 2rem;font-size:1.05rem}.card{background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);transition:all var(--transition-base);padding:1.5rem}.card:hover{background:var(--bg-card-hover);border-color:var(--border-default);box-shadow:var(--shadow-md);transform:translateY(-2px)}.badge{border-radius:var(--radius-full);letter-spacing:.02em;text-transform:uppercase;align-items:center;gap:.375rem;padding:.25rem .75rem;font-size:.75rem;font-weight:600;display:inline-flex}.badge-indigo{color:var(--indigo-400);background:#6366f126;border:1px solid #6366f14d}.badge-amber{color:var(--amber-400);background:#f59e0b26;border:1px solid #f59e0b4d}.badge-emerald{color:var(--emerald-400);background:#10b98126;border:1px solid #10b9814d}.badge-rose{color:var(--rose-400);background:#f43f5e26;border:1px solid #f43f5e4d}.difficulty-easy{color:var(--emerald-400);background:#10b9811a}.difficulty-moderate{color:var(--amber-400);background:#f59e0b1a}.difficulty-hard{color:var(--rose-400);background:#f43f5e1a}.difficulty-expert{color:var(--violet-500);background:#8b5cf61a}.input{background:var(--bg-glass);border:1px solid var(--border-default);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:all var(--transition-fast);outline:none;padding:.75rem 1rem;font-family:Inter,sans-serif;font-size:.95rem}.input:focus{border-color:var(--indigo-500);background:var(--bg-glass-hover);box-shadow:0 0 0 3px #6366f126}.input::placeholder{color:var(--text-muted)}.progress-bar{background:var(--bg-glass);border-radius:var(--radius-full);width:100%;height:6px;overflow:hidden}.progress-fill{background:var(--gradient-brand);border-radius:var(--radius-full);height:100%;transition:width var(--transition-slow)}.grid-2{grid-template-columns:repeat(2,1fr);gap:1.5rem;display:grid}.grid-3{grid-template-columns:repeat(3,1fr);gap:1.5rem;display:grid}.grid-4{grid-template-columns:repeat(4,1fr);gap:1.5rem;display:grid}.grid-auto{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;display:grid}@keyframes fadeInUp{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes pulse-glow{0%,to{box-shadow:0 0 20px #6366f14d}50%{box-shadow:0 0 40px #6366f199}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}@keyframes spin{to{transform:rotate(360deg)}}.animate-fade-up{animation:.6s forwards fadeInUp}.animate-fade-in{animation:.4s forwards fadeIn}.spinner{border:3px solid var(--border-subtle);border-top-color:var(--indigo-500);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--bg-glass-hover);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}::selection{color:var(--text-primary);background:#6366f14d}.section-label{letter-spacing:.1em;text-transform:uppercase;color:var(--indigo-400);align-items:center;gap:.5rem;margin-bottom:1rem;font-size:.8rem;font-weight:600;display:inline-flex}.section-label:before{content:"";background:var(--gradient-brand);border-radius:2px;width:20px;height:2px}.noise-overlay{pointer-events:none;z-index:0;opacity:.03;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='1'/%3E%3C/svg%3E");position:fixed;inset:0}.glow-orb{filter:blur(80px);pointer-events:none;z-index:0;opacity:.4;border-radius:50%;position:absolute}.tag{background:var(--bg-glass);border:1px solid var(--border-subtle);border-radius:var(--radius-sm);color:var(--text-secondary);white-space:nowrap;padding:.2rem .6rem;font-size:.75rem;display:inline-flex}@media (max-width:1024px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}}@media (max-width:768px){.container{padding:0 1rem}.section{padding:3.5rem 0}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}h1{font-size:2rem}h2{font-size:1.75rem}}