:root{--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-display: "Outfit", var(--font-sans);--bg-primary: #0a0b10;--bg-secondary: #11131e;--bg-tertiary: #1b1e2e;--bg-glass: rgba(17, 19, 30, .7);--border-glass: rgba(255, 255, 255, .08);--border-glass-hover: rgba(255, 255, 255, .15);--accent-primary: #8b5cf6;--accent-primary-glow: rgba(139, 92, 246, .3);--accent-secondary: #06b6d4;--accent-secondary-glow: rgba(6, 182, 212, .3);--color-success: #10b981;--color-success-bg: rgba(16, 185, 129, .15);--color-error: #ef4444;--color-error-bg: rgba(239, 68, 68, .15);--color-warning: #f59e0b;--text-primary: #f8fafc;--text-secondary: #94a3b8;--text-muted: #64748b;--shadow-glow: 0 8px 32px 0 rgba(0, 0, 0, .37);--transition-smooth: all .3s cubic-bezier(.4, 0, .2, 1);--border-radius-lg: 16px;--border-radius-md: 12px;--border-radius-sm: 8px}*{box-sizing:border-box;margin:0;padding:0;font-family:var(--font-sans)}body{background-color:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden;background-image:radial-gradient(circle at 10% 20%,rgba(139,92,246,.15) 0%,transparent 40%),radial-gradient(circle at 90% 80%,rgba(6,182,212,.12) 0%,transparent 40%);background-attachment:fixed}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:700;letter-spacing:-.02em}button,input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--bg-tertiary);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--accent-primary)}.app-container{display:flex;flex-direction:column;min-height:100vh;padding-bottom:2rem}.content-wrapper{flex:1;width:100%;max-width:900px;margin:0 auto;padding:2rem 1.5rem}.glass-card{background:var(--bg-glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-glass);border-radius:var(--border-radius-lg);box-shadow:var(--shadow-glow);padding:2rem;transition:var(--transition-smooth)}.glass-card:hover{border-color:var(--border-glass-hover);box-shadow:0 10px 40px #00000073}.form-group{margin-bottom:1.5rem}.form-label{display:block;font-size:.875rem;font-weight:600;color:var(--text-secondary);margin-bottom:.5rem;text-transform:uppercase;letter-spacing:.05em}.text-input,.select-input,.textarea-input{width:100%;background:#11131ecc;border:1px solid var(--border-glass);border-radius:var(--border-radius-md);padding:.85rem 1rem;color:var(--text-primary);outline:none;transition:var(--transition-smooth)}.text-input:focus,.select-input:focus,.textarea-input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-primary-glow)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:var(--font-display);font-weight:600;padding:.8rem 1.75rem;border-radius:var(--border-radius-md);border:none;cursor:pointer;transition:var(--transition-smooth);text-transform:uppercase;font-size:.875rem;letter-spacing:.02em}.btn-primary{background:linear-gradient(135deg,var(--accent-primary) 0%,#7c3aed 100%);box-shadow:0 4px 14px #8b5cf666;color:#fff}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 20px #8b5cf699}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-primary:disabled{background:var(--bg-tertiary);color:var(--text-muted);box-shadow:none;cursor:not-allowed}.btn-secondary{background:#ffffff0d;border:1px solid var(--border-glass);color:var(--text-primary)}.btn-secondary:hover:not(:disabled){background:#ffffff1a;border-color:var(--text-secondary)}.btn-danger{background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:#f87171}.btn-danger:hover{background:#ef4444;color:#fff}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes pulse-glow{0%,to{box-shadow:0 0 5px #06b6d466}50%{box-shadow:0 0 20px #06b6d4cc}}.animate-fade-in{animation:fadeIn .4s cubic-bezier(.16,1,.3,1) forwards}.loading-spinner{border:3px solid rgba(255,255,255,.1);border-top:3px solid var(--accent-secondary);border-radius:50%;width:28px;height:28px;animation:spin 1s linear infinite}.pulse-dot{width:8px;height:8px;border-radius:50%;background-color:var(--accent-secondary);animation:pulse-glow 2s infinite}.quiz-options-grid{display:grid;grid-template-columns:1fr;gap:1rem;margin-top:1.5rem}@media (min-width: 640px){.quiz-options-grid{grid-template-columns:1fr 1fr}}.option-btn{background:#ffffff05;border:1px solid var(--border-glass);padding:1.25rem;border-radius:var(--border-radius-md);text-align:left;cursor:pointer;transition:var(--transition-smooth);display:flex;align-items:center;gap:1rem}.option-btn:hover:not(.disabled){background:#ffffff0f;border-color:var(--accent-primary);transform:translate(4px)}.option-badge{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:#ffffff0d;font-weight:700;color:var(--text-secondary);font-size:.9rem;flex-shrink:0;transition:var(--transition-smooth)}.option-btn:hover:not(.disabled) .option-badge{background:var(--accent-primary);color:#fff}.option-btn.selected{border-color:var(--accent-primary);background:#8b5cf614}.option-btn.selected .option-badge{background:var(--accent-primary);color:#fff}.option-btn.correct{border-color:var(--color-success)!important;background:var(--color-success-bg)!important}.option-btn.correct .option-badge{background:var(--color-success)!important;color:#fff}.option-btn.incorrect{border-color:var(--color-error)!important;background:var(--color-error-bg)!important}.option-btn.incorrect .option-badge{background:var(--color-error)!important;color:#fff}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#050508d9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}.modal-content{width:100%;max-width:550px;animation:fadeIn .3s cubic-bezier(.16,1,.3,1) forwards}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1.5rem;border-bottom:1px solid var(--border-glass);padding-bottom:1rem}.navbar{border-bottom:1px solid var(--border-glass);background:#0a0b10cc;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);position:sticky;top:0;z-index:100}.navbar-container{max-width:1100px;margin:0 auto;padding:1rem 1.5rem;display:flex;align-items:center;justify-content:space-between}.nav-logo{font-family:var(--font-display);font-size:1.35rem;font-weight:800;background:linear-gradient(135deg,var(--text-primary) 30%,var(--accent-secondary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;display:flex;align-items:center;gap:.5rem;cursor:pointer}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin-bottom:2rem}@media (min-width: 768px){.stats-grid{grid-template-columns:repeat(4,1fr)}}.stat-card{background:#ffffff05;border:1px solid var(--border-glass);border-radius:var(--border-radius-md);padding:1.25rem;text-align:center}.stat-value{font-family:var(--font-display);font-size:1.75rem;font-weight:700;color:var(--accent-secondary);margin-bottom:.25rem}.stat-label{font-size:.75rem;text-transform:uppercase;color:var(--text-secondary);letter-spacing:.05em}.progress-bar-container{width:100%;height:6px;background:#ffffff0d;border-radius:3px;overflow:hidden;margin-top:1rem;margin-bottom:1.5rem}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent-primary) 0%,var(--accent-secondary) 100%);transition:width .3s ease-out}.history-item{display:flex;align-items:center;justify-content:space-between;padding:1rem 0;border-bottom:1px solid rgba(255,255,255,.04)}.history-item:last-child{border-bottom:none}