:root{--bg-color:#f8fafc;--bg-card:#fff;--text-color:#0f172a;--text-muted:#64748b;--primary:#3b82f6;--primary-hover:#2563eb;--border-color:#e2e8f0;--success:#10b981;--error:#ef4444;--glass-bg:#ffffffb3;--glass-border:#ffffff4d;--shadow:0 10px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;--transition:all .3s cubic-bezier(.4, 0, .2, 1)}[data-theme=dark]{--bg-color:#0f172a;--bg-card:#1e293b;--text-color:#f8fafc;--text-muted:#94a3b8;--primary:#3b82f6;--primary-hover:#60a5fa;--border-color:#334155;--glass-bg:#1e293bb3;--glass-border:#ffffff1a;--shadow:0 10px 25px -5px #00000080}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);transition:var(--transition);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6}#root{flex-direction:column;min-height:100vh;display:flex}header{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--glass-border);z-index:100;justify-content:space-between;align-items:center;padding:1.5rem 2rem;display:flex;position:sticky;top:0}h1{background:linear-gradient(135deg, var(--primary), #8b5cf6);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.5rem;font-weight:700}.container{flex:1;width:100%;max-width:800px;margin:2rem auto;padding:0 1.5rem}.card{background-color:var(--bg-card);box-shadow:var(--shadow);border:1px solid var(--border-color);border-radius:16px;padding:2rem;animation:.5s ease-out fadeIn}.btn{cursor:pointer;transition:var(--transition);background-color:var(--primary);color:#fff;border:none;border-radius:8px;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:1rem;font-weight:600;display:inline-flex}.btn:hover{background-color:var(--primary-hover);transform:translateY(-2px);box-shadow:0 4px 12px #3b82f64d}.btn-outline{border:1px solid var(--border-color);color:var(--text-color);background-color:#0000}.btn-outline:hover{background-color:var(--border-color);box-shadow:none;transform:translateY(-1px)}.btn-icon{color:var(--text-color);background:0 0;border:none;border-radius:50%;padding:.5rem}.btn-icon:hover{background-color:var(--border-color);box-shadow:none;transform:none}.option-btn{text-align:left;background-color:var(--bg-color);border:2px solid var(--border-color);width:100%;color:var(--text-color);cursor:pointer;transition:var(--transition);border-radius:12px;margin-bottom:1rem;padding:1rem 1.5rem;font-size:1rem}.option-btn:hover:not(:disabled){border-color:var(--primary);background-color:#3b82f60d}.option-btn.selected{border-color:var(--primary);background-color:#3b82f61a}.option-btn.correct{border-color:var(--success);background-color:#10b9811a}.option-btn.incorrect{border-color:var(--error);background-color:#ef44441a}.progress-bar-container{background-color:var(--border-color);border-radius:4px;width:100%;height:8px;margin:1.5rem 0;overflow:hidden}.progress-bar{background-color:var(--primary);height:100%;transition:width .3s}.dashboard-stats{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:2rem;display:grid}.stat-card{background-color:var(--bg-card);border:1px solid var(--border-color);text-align:center;border-radius:12px;padding:1.5rem}.stat-value{color:var(--primary);font-size:2.5rem;font-weight:800}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:.875rem;font-weight:500}.form-group{margin-bottom:1.5rem}.form-group label{margin-bottom:.5rem;font-weight:500;display:block}.form-control{border:1px solid var(--border-color);background-color:var(--bg-color);width:100%;color:var(--text-color);border-radius:8px;padding:.75rem 1rem;font-family:inherit;font-size:1rem}.form-control:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 3px #3b82f633}.flex-between{justify-content:space-between;align-items:center;display:flex}.mb-4{margin-bottom:1rem}.mb-8{margin-bottom:2rem}.text-center{text-align:center}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}#google_translate_element{margin-right:1rem}.goog-te-gadget-simple{color:var(--text-color)!important;background-color:#0000!important;border:none!important;font-family:inherit!important}.goog-te-gadget-simple .goog-te-menu-value span{color:var(--text-color)!important}iframe.goog-te-menu-frame{max-height:50vh!important;box-shadow:var(--shadow)!important;border-radius:8px!important;overflow-y:auto!important}.goog-te-gadget{color:#0000!important;font-family:inherit!important}.goog-te-gadget .goog-te-combo{border:1px solid var(--border-color);background-color:var(--bg-card);color:var(--text-color);border-radius:6px;padding:.5rem;font-family:inherit}