:root{--bg-primary:#0a0a1a;--bg-secondary:#12122a;--bg-tertiary:#1a1a3e;--bg-surface:#1e1e4a;--bg-glass:#ffffff0d;--bg-glass-hover:#ffffff14;--bg-glass-strong:#ffffff1f;--border-glass:#ffffff1a;--border-glass-hover:#fff3;--border-glass-strong:#ffffff40;--text-primary:#f0f0ff;--text-secondary:#a0a0cc;--text-muted:#6a6a99;--text-inverse:#0a0a1a;--accent-purple:#7c3aed;--accent-purple-light:#8b5cf6;--accent-purple-dark:#6d28d9;--accent-purple-glow:#7c3aed4d;--accent-purple-glow-strong:#7c3aed80;--accent-cyan:#06b6d4;--accent-cyan-light:#22d3ee;--accent-cyan-dark:#0891b2;--accent-cyan-glow:#06b6d44d;--accent-cyan-glow-strong:#06b6d480;--accent-pink:#ec4899;--accent-pink-light:#f472b6;--accent-pink-glow:#ec48994d;--accent-emerald:#10b981;--accent-emerald-light:#34d399;--accent-emerald-glow:#10b9814d;--accent-gold:#f59e0b;--accent-gold-light:#fbbf24;--accent-amber:#d97706;--accent-gold-glow:#f59e0b4d;--danger:#ef4444;--danger-light:#f87171;--danger-glow:#ef44444d;--success:#10b981;--warning:#f59e0b;--info:#06b6d4;--quiz-red:#e21b3c;--quiz-blue:#1368ce;--quiz-gold:#d89e00;--quiz-green:#26890c;--space-xs:.25rem;--space-sm:.5rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2rem;--space-2xl:3rem;--space-3xl:4rem;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 4px 16px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-xl:0 16px 48px #0009;--shadow-glow-purple:0 0 20px var(--accent-purple-glow), 0 0 60px var(--accent-purple-glow);--shadow-glow-cyan:0 0 20px var(--accent-cyan-glow), 0 0 60px var(--accent-cyan-glow);--shadow-glow-pink:0 0 20px var(--accent-pink-glow), 0 0 60px var(--accent-pink-glow);--shadow-glow-gold:0 0 20px var(--accent-gold-glow), 0 0 60px var(--accent-gold-glow);--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-base:.3s cubic-bezier(.4, 0, .2, 1);--transition-slow:.5s cubic-bezier(.4, 0, .2, 1);--transition-bounce:.5s cubic-bezier(.34, 1.56, .64, 1);--font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-display:"Outfit", "Inter", sans-serif;--z-base:1;--z-dropdown:100;--z-sticky:200;--z-overlay:300;--z-modal:400;--z-toast:500}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}body{font-family:var(--font-body);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizelegibility;min-height:100vh;line-height:1.6;overflow-x:hidden}#root{flex-direction:column;min-height:100vh;display:flex}img,picture,video,canvas,svg{max-width:100%;display:block}input,button,textarea,select{font:inherit;color:inherit}a{color:var(--accent-cyan-light);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--accent-cyan);text-decoration:underline}ul,ol{list-style:none}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--accent-purple);border-radius:var(--radius-full);border:2px solid var(--bg-secondary)}::-webkit-scrollbar-thumb:hover{background:var(--accent-purple-light)}*{scrollbar-width:thin;scrollbar-color:var(--accent-purple) var(--bg-secondary)}::selection{background:var(--accent-purple);color:#fff}::selection{background:var(--accent-purple);color:#fff}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);color:var(--text-primary);letter-spacing:-.01em;font-weight:700;line-height:1.2}h1{letter-spacing:-.02em;font-size:clamp(2rem,5vw,3.5rem);font-weight:800}h2{font-size:clamp(1.5rem,4vw,2.5rem);font-weight:700}h3{font-size:clamp(1.25rem,3vw,1.75rem);font-weight:600}h4{font-size:1.25rem;font-weight:600}h5{font-size:1.1rem;font-weight:600}h6{text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);font-size:.95rem;font-weight:600}p{color:var(--text-secondary);line-height:1.7}small{color:var(--text-muted);font-size:.85rem}.text-gradient{background:linear-gradient(135deg, var(--accent-purple-light), var(--accent-cyan-light));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.text-gradient-gold{background:linear-gradient(135deg, var(--accent-gold), var(--accent-amber));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.text-glow{text-shadow:0 0 20px var(--accent-purple-glow), 0 0 40px var(--accent-purple-glow)}@keyframes gradient-shift{0%{background-position:0%}25%{background-position:100%}50%{background-position:100% 100%}75%{background-position:0 100%}to{background-position:0%}}@keyframes float{0%{transform:translateY(0)}50%{transform:translateY(-10px)}to{transform:translateY(0)}}@keyframes pulse-glow{0%,to{opacity:.5;transform:translate(-50%,-50%)scale(1)}50%{opacity:.8;transform:translate(-50%,-50%)scale(1.3)}}@keyframes particle-float{0%{opacity:0;transform:translate(0)rotate(0)}10%{opacity:1}90%{opacity:1}to{transform:translate(var(--drift-x,100px), var(--drift-y,-300px)) rotate(360deg);opacity:0}}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes slide-up{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes slide-down{0%{opacity:0;transform:translateY(-30px)}to{opacity:1;transform:translateY(0)}}@keyframes fade-in{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@keyframes scale-in{0%{opacity:0;transform:scale(.85)}to{opacity:1;transform:scale(1)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes blob-morph{0%,to{border-radius:60% 40% 30% 70%/60% 30% 70% 40%}25%{border-radius:30% 60% 70% 40%/50% 60% 30%}50%{border-radius:50% 60% 30%/30% 40% 70% 60%}75%{border-radius:60% 30% 60% 40%/70% 50% 40% 60%}}@keyframes confetti-fall{0%{opacity:1;transform:translateY(-20px)rotate(0)}to{opacity:0;transform:translateY(100vh)rotate(720deg)}}@keyframes countdown-pulse{0%{opacity:1;transform:scale(1)}50%{opacity:.7;transform:scale(1.3)}to{opacity:1;transform:scale(1)}}@keyframes glow-rotate{0%{filter:hue-rotate()}to{filter:hue-rotate(360deg)}}.glass-card{-webkit-backdrop-filter:blur(20px);background:var(--bg-glass);border:1px solid var(--border-glass);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);transition:border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base), background var(--transition-base)}.glass-card:hover{border-color:var(--border-glass-hover);box-shadow:var(--shadow-lg);background:var(--bg-glass-hover)}.glass-card--interactive:hover{border-color:var(--accent-purple);box-shadow:var(--shadow-lg), var(--shadow-glow-purple);transform:translateY(-2px)}.glass-panel{-webkit-backdrop-filter:blur(24px);border:1px solid var(--border-glass);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);background:#12122acc}.glass-surface{-webkit-backdrop-filter:blur(12px);background:var(--bg-glass);border:1px solid var(--border-glass);border-radius:var(--radius-md)}.animated-bg{z-index:-1;background:linear-gradient(-45deg, var(--bg-primary), #0f0f2e, #1a0a2e, var(--bg-secondary), #0a1a2e);background-size:400% 400%;width:100%;height:100%;animation:20s infinite gradient-shift;position:fixed;top:0;left:0}.animated-bg:before,.animated-bg:after{content:"";opacity:.12;filter:blur(80px);pointer-events:none;border-radius:50%;animation:12s ease-in-out infinite alternate blob-morph,8s ease-in-out infinite float;position:absolute}.animated-bg:before{background:var(--accent-purple);width:600px;height:600px;animation-delay:-2s;top:-10%;right:-5%}.animated-bg:after{background:var(--accent-cyan);width:500px;height:500px;animation-delay:-5s;bottom:-10%;left:-5%}.floating-particles{pointer-events:none;z-index:0;width:100%;height:100%;position:fixed;top:0;left:0;overflow:hidden}.floating-particles .particle{width:var(--size,4px);height:var(--size,4px);background:var(--color,var(--accent-purple-light));opacity:0;animation:particle-float var(--duration,8s) var(--delay,0s) infinite;border-radius:50%;position:absolute}.glow-border{border-radius:var(--radius-lg);position:relative;overflow:hidden}.glow-border:before{content:"";border-radius:inherit;background:linear-gradient(45deg, var(--accent-purple), var(--accent-cyan), var(--accent-pink), var(--accent-purple));z-index:-1;opacity:0;transition:opacity var(--transition-base);background-size:300% 300%;animation:6s infinite gradient-shift;position:absolute;inset:-2px}.glow-border:hover:before{opacity:1}.glow-border:after{content:"";border-radius:inherit;background:var(--bg-tertiary);z-index:-1;position:absolute;inset:2px}.input-field{border:1px solid var(--border-glass);border-radius:var(--radius-md);width:100%;color:var(--text-primary);transition:border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);background:#ffffff0a;outline:none;padding:.75rem 1rem;font-size:.95rem;line-height:1.5}.input-field:hover{border-color:var(--border-glass-hover);background:#ffffff0f}.input-field:focus{border-color:var(--accent-purple);box-shadow:0 0 0 3px var(--accent-purple-glow);background:#ffffff0f}.input-field:disabled{opacity:.5;cursor:not-allowed}.input-field--error{border-color:var(--danger)}.input-field--error:focus{box-shadow:0 0 0 3px var(--danger-glow)}select.input-field{appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a0a0cc' viewBox='0 0 16 16'%3E%3Cpath d='M8 11.5l-5-5h10l-5 5z'/%3E%3C/svg%3E");background-position:right 1rem center;background-repeat:no-repeat;padding-right:2.5rem}select.input-field option{background:var(--bg-secondary);color:var(--text-primary);padding:.5rem}textarea.input-field{resize:vertical;min-height:100px}.form-label{color:var(--text-secondary);margin-bottom:var(--space-xs);letter-spacing:.02em;font-size:.85rem;font-weight:600;display:block}.form-label--required:after{content:" *";color:var(--accent-pink)}.form-group{margin-bottom:var(--space-lg)}.form-error{color:var(--danger-light);margin-top:var(--space-xs);font-size:.8rem}.btn{justify-content:center;align-items:center;gap:var(--space-sm);font-family:var(--font-body);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);white-space:nowrap;-webkit-user-select:none;user-select:none;border:none;padding:.7rem 1.5rem;font-size:.95rem;font-weight:600;line-height:1;text-decoration:none;display:inline-flex;position:relative;overflow:hidden}.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none!important;transform:none!important}.btn:active:not(:disabled){transform:scale(.97)}.btn-primary{background:linear-gradient(135deg, var(--accent-purple), var(--accent-purple-light));color:#fff;box-shadow:var(--shadow-sm)}.btn-primary:hover:not(:disabled){box-shadow:var(--shadow-glow-purple);background:linear-gradient(135deg, var(--accent-purple-light), var(--accent-purple));transform:translateY(-2px)}.btn-primary:active:not(:disabled){transform:translateY(0)scale(.98)}.btn-secondary{background:var(--bg-glass);color:var(--text-primary);border:1px solid var(--border-glass);-webkit-backdrop-filter:blur(12px)}.btn-secondary:hover:not(:disabled){background:var(--bg-glass-hover);border-color:var(--accent-purple-light);box-shadow:0 0 12px var(--accent-purple-glow);transform:translateY(-1px)}.btn-danger{background:linear-gradient(135deg, var(--danger), var(--danger-light));color:#fff;box-shadow:var(--shadow-sm)}.btn-danger:hover:not(:disabled){box-shadow:0 0 20px var(--danger-glow), 0 0 40px var(--danger-glow);transform:translateY(-2px)}.btn-ghost{color:var(--text-secondary);background:0 0;padding:.5rem .75rem}.btn-ghost:hover:not(:disabled){background:var(--bg-glass);color:var(--text-primary)}.btn-cyan{background:linear-gradient(135deg, var(--accent-cyan), var(--accent-cyan-light));color:var(--text-inverse);font-weight:700}.btn-cyan:hover:not(:disabled){box-shadow:var(--shadow-glow-cyan);transform:translateY(-2px)}.btn-gold{background:linear-gradient(135deg, var(--accent-amber), var(--accent-gold));color:var(--text-inverse);font-weight:700}.btn-gold:hover:not(:disabled){box-shadow:var(--shadow-glow-gold);transform:translateY(-2px)}.btn--sm{border-radius:var(--radius-sm);padding:.45rem .9rem;font-size:.85rem}.btn--lg{border-radius:var(--radius-lg);padding:.9rem 2rem;font-size:1.05rem}.btn--full{width:100%}.btn--icon{border-radius:var(--radius-md);padding:.6rem}.loading-spinner--sm{border-width:2px;width:20px;height:20px}.loading-spinner--lg{border-width:4px;width:48px;height:48px}.shimmer{background:linear-gradient(90deg, var(--bg-glass) 25%, #ffffff14 50%, var(--bg-glass) 75%);border-radius:var(--radius-md);background-size:200% 100%;animation:1.5s ease-in-out infinite shimmer}.pulse-dot{border-radius:50%;width:10px;height:10px;display:inline-block;position:relative}.pulse-dot:before{content:"";border-radius:50%;animation:2s ease-in-out infinite pulse-glow;position:absolute;inset:-3px}.conn-ok{background:var(--accent-emerald)}.conn-ok:before{background:var(--accent-emerald-glow)}.conn-err{background:var(--danger)}.conn-err:before{background:var(--danger-glow)}.conn-warn{background:var(--accent-gold)}.conn-warn:before{background:var(--accent-gold-glow)}.badge{border-radius:var(--radius-full);letter-spacing:.02em;white-space:nowrap;align-items:center;gap:.3rem;padding:.25rem .65rem;font-size:.75rem;font-weight:600;display:inline-flex}.badge--purple{background:var(--accent-purple-glow);color:var(--accent-purple-light);border:1px solid #7c3aed4d}.badge--cyan{background:var(--accent-cyan-glow);color:var(--accent-cyan-light);border:1px solid #06b6d44d}.badge--emerald{background:var(--accent-emerald-glow);color:var(--accent-emerald-light);border:1px solid #10b9814d}.badge--gold{background:var(--accent-gold-glow);color:var(--accent-gold-light);border:1px solid #f59e0b4d}.badge--pink{background:var(--accent-pink-glow);color:var(--accent-pink-light);border:1px solid #ec48994d}.badge--danger{background:var(--danger-glow);color:var(--danger-light);border:1px solid #ef44444d}.container{width:100%;max-width:1200px;padding-inline:var(--space-md);margin-inline:auto}.container--narrow{max-width:640px}.container--wide{max-width:1400px}.flex{display:flex}.flex-col{flex-direction:column}.flex-center{justify-content:center;align-items:center;display:flex}.flex-between{justify-content:space-between;align-items:center;display:flex}.gap-xs{gap:var(--space-xs)}.gap-sm{gap:var(--space-sm)}.gap-md{gap:var(--space-md)}.gap-lg{gap:var(--space-lg)}.gap-xl{gap:var(--space-xl)}.animate-slide-up{animation:slide-up .5s var(--transition-base) both}.animate-fade-in{animation:.4s both fade-in}.animate-scale-in{animation:scale-in .3s var(--transition-bounce) 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var(--accent-emerald-glow)}.quiz-option--incorrect{opacity:.5;filter:grayscale(.4)}.score-display{font-family:var(--font-display);letter-spacing:-.02em;text-align:center;font-size:3rem;font-weight:900}.score-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;font-size:.85rem;font-weight:500}.rank-badge{width:48px;height:48px;font-family:var(--font-display);border-radius:50%;justify-content:center;align-items:center;font-size:1.2rem;font-weight:800;display:inline-flex}.rank-badge--gold{color:#1a1a3e;box-shadow:var(--shadow-glow-gold);background:linear-gradient(135deg,#fbbf24,#f59e0b)}.rank-badge--silver{color:#1a1a3e;background:linear-gradient(135deg,#d1d5db,#9ca3af)}.rank-badge--bronze{color:#fff;background:linear-gradient(135deg,#d97706,#92400e)}@media (width>=768px){.container{padding-inline:var(--space-xl)}h1{font-size:2.75rem}h2{font-size:2rem}.btn--lg{padding:1rem 2.5rem;font-size:1.1rem}.quiz-option{padding:var(--space-xl);font-size:1.25rem}}@media (width>=1024px){.container{padding-inline:var(--space-2xl)}h1{font-size:3.25rem}.score-display{font-size:4rem}}@media (width>=1440px){.container{max-width:1280px}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}.animated-bg,.animated-bg:before,.animated-bg:after{animation:none}}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.truncate{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.no-scroll{overflow:hidden}.divider{border:none;border-top:1px solid var(--border-glass);margin:var(--space-lg) 0}.backdrop-overlay{-webkit-backdrop-filter:blur(8px);z-index:var(--z-overlay);background:#0009;animation:.2s 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24px;display:flex;position:relative}.home-logo{text-align:center;position:relative}.logo-glow{pointer-events:none;background:radial-gradient(circle,#7c3aed4d 0%,#0000 70%);border-radius:50%;width:200px;height:200px;animation:3s ease-in-out infinite pulse-glow;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.logo-icon{filter:drop-shadow(0 0 20px #f59e0b80);margin-bottom:4px;font-size:3.5rem;display:block}.home-logo h1{background:linear-gradient(135deg,#f0f0ff,#a78bfa,#22d3ee);-webkit-text-fill-color:transparent;letter-spacing:-1px;-webkit-background-clip:text;background-clip:text;font-family:Outfit,sans-serif;font-size:3.2rem;font-weight:900;line-height:1.1}.tagline{color:#8b8bb8;letter-spacing:.3px;margin-top:8px;font-size:1.05rem;font-weight:400}.teacher-bar{-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#ffffff0d;border:1px solid #ffffff14;border-radius:50px;align-items:center;gap:10px;padding:10px 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