:root{--font-sans:"Google Sans Flex", system-ui, -apple-system, sans-serif;--bg-dark:#f8fafc;--bg-card:#ffffffbf;--bg-card-hover:#fffffff2;--border-glow:#6366f11f;--border-glow-hover:#6366f14d;--color-primary:#4f46e5;--color-primary-glow:#4f46e514;--color-wave1:#0891b2;--color-wave1-glow:#0891b214;--color-wave2:#c026d3;--color-wave2-glow:#c026d314;--color-combined:#d97706;--color-combined-glow:#d9770614;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--glass-blur:blur(20px);--shadow-premium:0 10px 30px -10px #00000014, 0 1px 3px #00000005;--transition-smooth:all .3s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-dark);color:var(--text-primary);-webkit-font-smoothing:antialiased;background-image:radial-gradient(circle at 10% 20%,#6366f10d 0%,#0000 40%),radial-gradient(circle at 90% 80%,#0891b20d 0%,#0000 40%);background-attachment:fixed;min-height:100vh;overflow-x:hidden}#root{flex-direction:column;min-height:100vh;display:flex}.glass-card{background:var(--bg-card);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--border-glow);box-shadow:var(--shadow-premium);transition:var(--transition-smooth);border-radius:20px}.glass-card:hover{border-color:var(--border-glow-hover);background:var(--bg-card-hover);transform:translateY(-2px);box-shadow:0 20px 40px -15px #6366f126}.btn{font-family:var(--font-sans);cursor:pointer;transition:var(--transition-smooth);border:none;border-radius:12px;align-items:center;gap:8px;padding:10px 24px;font-size:.95rem;font-weight:600;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--color-primary) 0%, #3730a3 100%);color:#fff;box-shadow:0 4px 14px #4f46e540}.btn-primary:hover{filter:brightness(1.1);transform:translateY(-1px);box-shadow:0 6px 20px #4f46e566}.btn-secondary{color:var(--text-primary);background:#0000000a;border:1px solid #0000000f}.btn-secondary:hover{background:#00000014;border-color:#0000001f}input[type=range]{-webkit-appearance:none;width:100%;height:6px;transition:var(--transition-smooth);background:#0000000f;border-radius:3px;outline:none}input[type=range]::-webkit-slider-thumb{appearance:none;background:var(--color-primary);cursor:pointer;width:18px;height:18px;transition:var(--transition-smooth);border-radius:50%;box-shadow:0 2px 6px #4f46e54d}input[type=range]::-webkit-slider-thumb:hover{background:#6366f1;transform:scale(1.2)}.container{width:100%;max-width:100%;margin:0 auto;padding:0 24px}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-dark)}::-webkit-scrollbar-thumb{background:#6366f126;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#6366f14d}.nav-header{border-radius:16px;justify-content:space-between;align-items:center;margin:24px 24px 0;padding:16px 32px;display:flex}.logo-text-glow{letter-spacing:-.02em;background:linear-gradient(90deg, var(--text-primary) 0%, var(--text-secondary) 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.2rem;font-weight:700}.nav-links-container{gap:8px;display:flex}@media (width<=640px){.nav-header{text-align:center;flex-direction:column;gap:16px;margin:12px 12px 0;padding:12px 16px}.nav-links-container{justify-content:space-around;gap:4px;width:100%}.logo-text-glow{font-size:1.1rem}}.quiz-options-list{grid-template-columns:1fr 1fr;gap:14px;margin-top:12px;display:grid}@media (width<=768px){.quiz-options-list{grid-template-columns:1fr}}