@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap";
:root{--bg-primary:#0a0a0f;--bg-secondary:#12121a;--bg-tertiary:#1a1a25;--bg-card:#1a1a25b3;--bg-glass:#ffffff08;--gradient-primary:linear-gradient(135deg,#6366f1 0%,#8b5cf6 50%,#a855f7 100%);--gradient-secondary:linear-gradient(135deg,#3b82f6 0%,#6366f1 100%);--gradient-success:linear-gradient(135deg,#10b981 0%,#34d399 100%);--gradient-warning:linear-gradient(135deg,#f59e0b 0%,#fbbf24 100%);--gradient-danger:linear-gradient(135deg,#ef4444 0%,#f87171 100%);--gradient-glow:radial-gradient(ellipse at center,#6366f126 0%,transparent 70%);--text-primary:#fff;--text-secondary:#ffffffb3;--text-muted:#fff6;--text-accent:#a5b4fc;--border-primary:#ffffff14;--border-accent:#6366f14d;--border-glow:#6366f180;--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 8px 32px #0006;--shadow-lg:0 16px 64px #00000080;--shadow-glow:0 0 40px #6366f133;--spacing-xs:.25rem;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--spacing-3xl:4rem;--radius-sm:.5rem;--radius-md:.75rem;--radius-lg:1rem;--radius-xl:1.5rem;--radius-full:9999px;--font-sans:"Inter",-apple-system,BlinkMacSystemFont,sans-serif;--font-display:"Space Grotesk",sans-serif;--transition-fast:.15s cubic-bezier(.4,0,.2,1);--transition-base:.25s cubic-bezier(.4,0,.2,1);--transition-slow:.4s cubic-bezier(.4,0,.2,1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6;overflow-x:hidden}body:before{content:"";pointer-events:none;z-index:-1;background:radial-gradient(80% 50% at 50% -20%,#6366f126,#0000),radial-gradient(60% 40% at 80% 60%,#8b5cf61a,#0000),radial-gradient(50% 30% at 20% 80%,#3b82f614,#0000);position:fixed;inset:0}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);letter-spacing:-.02em;font-weight:700;line-height:1.2}h1{background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:clamp(2.5rem,5vw,4rem)}h2{font-size:clamp(1.75rem,4vw,2.5rem)}h3{font-size:clamp(1.25rem,3vw,1.75rem)}a{color:var(--text-accent);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--text-primary)}.container{width:100%;max-width:1280px;padding:0 var(--spacing-lg);margin:0 auto}.card{background:var(--bg-card);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-primary);border-radius:var(--radius-lg);padding:var(--spacing-xl);transition:all var(--transition-base)}.card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-glow);transform:translateY(-2px)}.card-glass{background:var(--bg-glass);-webkit-backdrop-filter:blur(20px);border:1px solid var(--border-primary);border-radius:var(--radius-lg)}.btn{justify-content:center;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md)var(--spacing-xl);font-family:var(--font-sans);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-base);border:none;font-size:1rem;font-weight:600;text-decoration:none;display:inline-flex}.btn-primary{background:var(--gradient-primary);color:#fff;box-shadow:0 4px 20px #6366f166}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px #6366f180}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-primary)}.btn-secondary:hover{background:var(--bg-secondary);border-color:var(--border-accent)}.btn-outline{color:var(--text-accent);border:1px solid var(--border-accent);background:0 0}.btn-outline:hover{border-color:var(--border-glow);background:#6366f11a}.btn-lg{padding:var(--spacing-lg)var(--spacing-2xl);font-size:1.125rem}.btn-sm{padding:var(--spacing-sm)var(--spacing-md);font-size:.875rem}.badge{padding:var(--spacing-xs)var(--spacing-sm);border-radius:var(--radius-full);color:var(--text-accent);border:1px solid var(--border-accent);background:#6366f133;align-items:center;font-size:.75rem;font-weight:600;display:inline-flex}.badge-success{color:#34d399;background:#10b98133;border-color:#10b9814d}.badge-warning{color:#fbbf24;background:#f59e0b33;border-color:#f59e0b4d}.badge-danger{color:#f87171;background:#ef444433;border-color:#ef44444d}.input{width:100%;padding:var(--spacing-md);font-family:var(--font-sans);background:var(--bg-tertiary);border:1px solid var(--border-primary);border-radius:var(--radius-md);color:var(--text-primary);transition:all var(--transition-fast);font-size:1rem}.input:focus{border-color:var(--border-accent);outline:none;box-shadow:0 0 0 3px #6366f11a}.input::placeholder{color:var(--text-muted)}.option-group{gap:var(--spacing-sm);flex-direction:column;display:flex}.option{align-items:flex-start;gap:var(--spacing-md);padding:var(--spacing-md)var(--spacing-lg);background:var(--bg-tertiary);border:2px solid var(--border-primary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);display:flex}.option:hover{border-color:var(--border-accent);background:#6366f10d}.option.selected{border-color:var(--border-glow);background:#6366f11a}.option.correct{background:#10b9811a;border-color:#10b981}.option.incorrect{background:#ef44441a;border-color:#ef4444}.option-label{background:var(--bg-secondary);border-radius:var(--radius-sm);flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-weight:600;display:flex}.option.selected .option-label{background:var(--gradient-primary)}.progress{background:var(--bg-tertiary);border-radius:var(--radius-full);height:8px;overflow:hidden}.progress-bar{background:var(--gradient-primary);border-radius:var(--radius-full);height:100%;transition:width var(--transition-slow)}.grid{gap:var(--spacing-lg);display:grid}.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}@media (max-width:1024px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}}@media (max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.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-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.gap-xl{gap:var(--spacing-xl)}.text-center{text-align:center}.text-muted{color:var(--text-muted)}.text-secondary{color:var(--text-secondary)}.text-accent{color:var(--text-accent)}.text-success{color:#34d399}.text-warning{color:#fbbf24}.text-danger{color:#f87171}.text-sm{font-size:.875rem}.text-lg{font-size:1.125rem}.text-xl{font-size:1.25rem}.text-2xl{font-size:1.5rem}.font-medium{font-weight:500}.font-semibold{font-weight:600}.font-bold{font-weight:700}.mt-sm{margin-top:var(--spacing-sm)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}.mt-xl{margin-top:var(--spacing-xl)}.mt-2xl{margin-top:var(--spacing-2xl)}.mb-sm{margin-bottom:var(--spacing-sm)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.mb-xl{margin-bottom:var(--spacing-xl)}.mb-2xl{margin-bottom:var(--spacing-2xl)}.py-sm{padding-top:var(--spacing-sm);padding-bottom:var(--spacing-sm)}.py-md{padding-top:var(--spacing-md);padding-bottom:var(--spacing-md)}.py-lg{padding-top:var(--spacing-lg);padding-bottom:var(--spacing-lg)}.py-xl{padding-top:var(--spacing-xl);padding-bottom:var(--spacing-xl)}.py-2xl{padding-top:var(--spacing-2xl);padding-bottom:var(--spacing-2xl)}.py-3xl{padding-top:var(--spacing-3xl);padding-bottom:var(--spacing-3xl)}.timer{align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm)var(--spacing-lg);background:var(--bg-tertiary);border:1px solid var(--border-primary);border-radius:var(--radius-full);font-family:var(--font-display);font-size:1.25rem;font-weight:600;display:flex}.timer.warning{color:#fbbf24;background:#f59e0b1a;border-color:#f59e0b80}.timer.danger{color:#f87171;background:#ef44441a;border-color:#ef444480;animation:1s ease-in-out infinite pulse}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.question-nav{gap:var(--spacing-sm);grid-template-columns:repeat(5,1fr);display:grid}.question-nav-item{background:var(--bg-tertiary);border:1px solid var(--border-primary);border-radius:var(--radius-sm);cursor:pointer;width:44px;height:44px;transition:all var(--transition-fast);justify-content:center;align-items:center;font-weight:600;display:flex}.question-nav-item:hover{border-color:var(--border-accent)}.question-nav-item.current{background:var(--gradient-primary);border-color:#0000}.question-nav-item.answered{background:#10b98133;border-color:#10b9814d}.question-nav-item.marked{background:#f59e0b33;border-color:#f59e0b4d}.stat-card{gap:var(--spacing-xs);padding:var(--spacing-lg);background:var(--bg-glass);border:1px solid var(--border-primary);border-radius:var(--radius-md);flex-direction:column;display:flex}.stat-value{font-family:var(--font-display);background:var(--gradient-primary);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:2rem;font-weight:700}.stat-label{color:var(--text-muted);font-size:.875rem}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.animate-fade-in{animation:fadeIn var(--transition-base)ease-out}.animate-slide-up{animation:slideUp var(--transition-slow)ease-out}.animate-scale-in{animation:scaleIn var(--transition-base)ease-out}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--bg-tertiary);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:#6366f14d}::selection{color:#fff;background:#6366f14d}.test-mode-card{gap:var(--spacing-lg);padding:var(--spacing-2xl);background:var(--bg-card);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border:1px solid var(--border-primary);border-radius:var(--radius-xl);transition:all var(--transition-base);flex-direction:column;display:flex;position:relative;overflow:hidden}.test-mode-card:before{content:"";background:var(--gradient-primary);opacity:0;height:4px;transition:opacity var(--transition-base);position:absolute;top:0;left:0;right:0}.test-mode-card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-glow);transform:translateY(-4px)}.test-mode-card:hover:before{opacity:1}.test-mode-icon{background:var(--gradient-primary);border-radius:var(--radius-lg);justify-content:center;align-items:center;width:64px;height:64px;font-size:1.75rem;display:flex}.test-mode-title{font-family:var(--font-display);font-size:1.5rem;font-weight:700}.test-mode-description{color:var(--text-secondary);line-height:1.7}.test-mode-stats{gap:var(--spacing-lg);padding-top:var(--spacing-lg);border-top:1px solid var(--border-primary);display:flex}.test-mode-stat{gap:var(--spacing-xs);flex-direction:column;display:flex}.test-mode-stat-value{font-family:var(--font-display);color:var(--text-accent);font-weight:700}.test-mode-stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:.75rem}.topic-pill{align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm)var(--spacing-md);background:var(--bg-tertiary);border:1px solid var(--border-primary);border-radius:var(--radius-full);cursor:pointer;transition:all var(--transition-fast);font-size:.875rem;display:inline-flex}.topic-pill:hover{border-color:var(--border-accent)}.topic-pill.active{border-color:var(--border-accent);color:var(--text-accent);background:#6366f133}.math-content{font-size:1.1em}.header{z-index:100;padding:var(--spacing-md)0;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--border-primary);background:#0a0a0fcc;position:sticky;top:0}.header-content{justify-content:space-between;align-items:center;display:flex}.logo{align-items:center;gap:var(--spacing-sm);font-family:var(--font-display);font-size:1.25rem;font-weight:700;display:flex}.logo-icon{background:var(--gradient-primary);border-radius:var(--radius-sm);justify-content:center;align-items:center;width:40px;height:40px;display:flex}.footer{padding:var(--spacing-2xl)0;border-top:1px solid var(--border-primary);text-align:center;color:var(--text-muted)}@media (max-width:768px){.header-content{gap:var(--spacing-md);padding-bottom:var(--spacing-md);flex-direction:column}.logo{margin-bottom:var(--spacing-xs)}nav{flex-wrap:wrap;justify-content:center;gap:var(--spacing-sm)!important}.container{padding:0 var(--spacing-md)}.py-3xl{padding-top:var(--spacing-xl);padding-bottom:var(--spacing-xl)}.py-2xl{padding-top:var(--spacing-lg);padding-bottom:var(--spacing-lg)}.test-mode-card{padding:var(--spacing-lg)}h1{font-size:2.5rem!important}}