:root{--bg:#0d0d1a;--surface:#13131f;--surface-2:#1a1a2e;--surface-3:#20203a;--border:#2a2a45;--border-2:#35355a;--text:#e8e8f0;--text-muted:#88a;--text-dim:#5a5a7a;--accent:#a855f7;--accent-2:#7c3aed;--accent-3:#c084fc;--accent-dim:#a855f714;--success:#22c55e;--success-dim:#22c55e1f;--error:#ef4444;--error-dim:#ef44441f;--warning:#f59e0b;--info:#38bdf8;--info-dim:#38bdf814;--level-beginner:#22c55e;--level-intermediate:#3b82f6;--level-advanced:#f59e0b;--level-expert:#ef4444;--font-sans:"Segoe UI", system-ui, -apple-system, sans-serif;--font-mono:"Cascadia Code", "Fira Code", "JetBrains Mono", monospace;--font-size-sm:.82rem;--font-size-base:.95rem;--font-size-lg:1.15rem;--font-size-xl:1.5rem;--font-size-2xl:2rem;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--transition-fast:.18s ease;--transition-base:.25s ease;--transition-slow:.35s ease}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background:var(--bg);color:var(--text);background-image:radial-gradient(ellipse 80% 60% at 50% -10%, color-mix(in srgb, var(--accent) 12%, transparent) 0%, transparent 60%), radial-gradient(ellipse 50% 40% at 90% 80%, color-mix(in srgb, var(--accent-2) 6%, transparent) 0%, transparent 50%);min-height:100vh;line-height:1.6}a{color:var(--accent-3);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--accent)}code{font-family:var(--font-mono);background:var(--surface-2);border:1px solid var(--border);color:var(--accent-3);border-radius:5px;padding:.1em .4em;font-size:.88em}.container{width:100%;max-width:860px;margin:0 auto;padding:1.5rem 1rem 3rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);animation:fadeIn var(--transition-slow);padding:2rem}.badge{border-radius:var(--radius-xl);text-transform:uppercase;letter-spacing:.05em;align-items:center;gap:.4rem;padding:.25rem .7rem;font-size:.75rem;font-weight:700;display:inline-flex}.callout{background:var(--info-dim);border:1px solid color-mix(in srgb, var(--info) 25%, transparent);border-radius:var(--radius-sm);font-size:var(--font-size-sm);color:var(--text-muted);align-items:flex-start;gap:.65rem;margin-bottom:1.25rem;padding:.8rem 1rem;line-height:1.5;display:flex}.callout strong{color:var(--info)}.btn{cursor:pointer;transition:all var(--transition-fast);font-size:.95rem;font-weight:700;font-family:var(--font-sans);border:none;border-radius:10px;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;text-decoration:none;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--accent-2), var(--accent));color:#fff}.btn-primary:hover{box-shadow:0 4px 20px color-mix(in srgb, var(--accent) 35%, transparent);transform:translateY(-1px)}.btn-secondary{color:var(--text);border:1px solid var(--border);background:0 0}.btn-secondary:hover{border-color:var(--accent);background:var(--accent-dim)}.btn-sm{border-radius:var(--radius-sm);padding:.4rem .9rem;font-size:.82rem}.progress-wrap{background:var(--surface-2);border-radius:4px;height:6px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--accent-2), var(--accent-3));border-radius:4px;height:100%;transition:width .5s}.grid-2{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.grid-3{grid-template-columns:1fr 1fr 1fr;gap:.75rem;display:grid}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-1{gap:.5rem}.gap-2{gap:.75rem}.gap-3{gap:1rem}.flex-wrap{flex-wrap:wrap}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.text-sm{font-size:var(--font-size-sm)}.text-lg{font-size:var(--font-size-lg)}.font-bold{font-weight:700}.app-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:2rem;padding:1rem 0;display:flex}.app-logo{align-items:center;gap:.5rem;font-size:1.3rem;font-weight:800;display:inline-flex}.app-logo-icon{background:linear-gradient(135deg, var(--accent), var(--accent-2));border-radius:10px;justify-content:center;align-items:center;width:40px;height:40px;font-size:1.3rem;display:flex}.app-nav{align-items:center;gap:1.5rem;display:flex}.app-nav a{color:var(--text-muted);font-size:.9rem;font-weight:500}.app-nav a:hover{color:var(--text)}.level-beginner{--level-color:var(--level-beginner)}.level-intermediate{--level-color:var(--level-intermediate)}.level-advanced{--level-color:var(--level-advanced)}.level-expert{--level-color:var(--level-expert)}[class*=level-].badge{background:color-mix(in srgb, var(--level-color) 18%, transparent);color:var(--level-color)}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(-6px)}to{opacity:1;transform:translate(0)}}@media (width<=768px){.card{padding:1.25rem}.grid-2,.grid-3{grid-template-columns:1fr}.app-header{flex-direction:column;align-items:flex-start}}@media (width<=480px){html{font-size:14px}.container{padding:1rem .75rem 2rem}}