:root{--cx-violet:var(--color-primary);--cx-violet-hover:var(--color-primary-hover);--cx-violet-soft:var(--color-primary-light);--cx-violet-rgb:var(--color-primary-rgb);--cx-gold:var(--color-warning);--cx-gold-hover:var(--color-warning);--cx-gold-soft:var(--color-warning-light);--cx-teal:var(--color-info);--cx-teal-soft:var(--color-info-light);--cx-emerald:var(--color-success);--cx-emerald-soft:var(--color-success-light);--cx-coral:var(--color-danger);--cx-coral-soft:var(--color-danger-light);--cx-amber:var(--color-warning);--cx-amber-soft:var(--color-warning-light);--cx-sky:var(--color-info);--cx-sky-soft:var(--color-info-light);--cx-page:var(--color-bg);--cx-page-alt:var(--color-bg-secondary);--cx-panel:var(--color-surface);--cx-tile:var(--color-card);--cx-tile-hover:var(--color-card-hover);--cx-ink:var(--color-text);--cx-ink-mid:var(--color-text-secondary);--cx-ink-dim:var(--color-text-tertiary);--cx-ink-flip:var(--color-text-inverse);--cx-stroke:var(--color-border);--cx-stroke-hover:var(--color-border-hover);--cx-rule:var(--color-divider);--cx-grad-main:var(--gradient-cta);--cx-grad-hero:var(--gradient-hero);--cx-grad-soft:var(--gradient-card);--cx-grad-glass:var(--gradient-glass);--cx-grad-teal:var(--gradient-accent);--cx-font:var(--font-family);--cx-font-title:var(--font-display);--cx-fs-xs:.75rem;--cx-fs-sm:.875rem;--cx-fs-md:1rem;--cx-fs-lg:1.125rem;--cx-fs-xl:1.25rem;--cx-fs-2xl:1.5rem;--cx-fs-3xl:1.875rem;--cx-fs-4xl:2.25rem;--cx-fs-5xl:3rem;--cx-g1:.25rem;--cx-g2:.5rem;--cx-g3:.75rem;--cx-g4:1rem;--cx-g5:1.25rem;--cx-g6:1.5rem;--cx-g8:2rem;--cx-g10:2.5rem;--cx-g12:3rem;--cx-g16:4rem;--cx-g20:5rem;--cx-r-sm:var(--radius-sm);--cx-r-md:var(--radius-md);--cx-r-lg:var(--radius-lg);--cx-r-xl:var(--radius-xl);--cx-r-full:var(--radius-full);--cx-sh-xs:var(--shadow-xs);--cx-sh-sm:var(--shadow-sm);--cx-sh-md:var(--shadow-md);--cx-sh-lg:var(--shadow-lg);--cx-sh-xl:var(--shadow-xl);--cx-sh-glow:var(--glow-soft);--cx-ease-fast:calc(.15s * var(--motion-scale,1)) ease;--cx-ease-mid:calc(.28s * var(--motion-scale,1)) ease;--cx-ease-slow:calc(.42s * var(--motion-scale,1)) ease;--cx-ease-bounce:calc(.3s * var(--motion-scale,1)) cubic-bezier(.22, 1, .36, 1);--cx-max-w:1180px;--cx-topbar-h:70px;--cx-dock-h:60px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-family);font-size:var(--text-base);line-height:var(--leading-normal);color:var(--color-text);background-color:var(--color-bg);min-height:100vh;transition:background-color var(--transition-base), color var(--transition-base);overflow-x:hidden}a{color:inherit;transition:color var(--transition-fast);text-decoration:none}a:hover{color:inherit}img,svg{max-width:100%;height:auto;display:block}ul,ol{list-style:none}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);line-height:var(--leading-tight);color:var(--color-text);font-weight:var(--font-bold)}h1{font-size:var(--text-4xl)}h2{font-size:var(--text-3xl)}h3{font-size:var(--text-2xl)}h4{font-size:var(--text-xl)}h5{font-size:var(--text-lg)}p{margin-bottom:var(--space-4);color:var(--color-text-secondary)}strong{font-weight:var(--font-semibold)}small{font-size:var(--text-sm)}::selection{background-color:var(--color-primary);color:var(--color-text-inverse)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--color-border);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-text-tertiary)}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:var(--radius-sm)}hr{background:var(--color-divider);height:1px;margin:var(--space-6) 0;border:none}@media (width<=640px){html{font-size:14px}h1{font-size:var(--text-3xl)}h2{font-size:var(--text-2xl)}h3{font-size:var(--text-xl)}}.container{width:100%;max-width:var(--container-xl);padding:0 var(--space-4);margin:0 auto}.container-sm{max-width:var(--container-sm)}.container-md{max-width:var(--container-md)}.container-lg{max-width:var(--container-lg)}.page{min-height:100vh;padding-top:calc(var(--nav-height) + env(safe-area-inset-top,0px))}.page-content{padding:var(--space-6) 0}@media (width<=640px){.page{padding-bottom:calc(var(--bottom-nav-height) + env(safe-area-inset-bottom,0px))}.page-content{padding:var(--space-4) 0}}.section{padding:var(--space-16) 0}.section-sm{padding:var(--space-8) 0}@media (width<=640px){.section{padding:var(--space-10) 0}.section-sm{padding:var(--space-6) 0}}.grid{gap:var(--space-6);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 (width<=1024px){.grid-4,.grid-3{grid-template-columns:repeat(2,1fr)}}@media (width<=640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.grid{gap:var(--space-4)}}.flex{display:flex}.flex-col{flex-direction:column}.flex-wrap{flex-wrap:wrap}.flex-center{justify-content:center;align-items:center;display:flex}.flex-between{justify-content:space-between;align-items:center;display:flex}.flex-start{justify-content:flex-start;align-items:center;display:flex}.flex-end{align-items:flex-end;display:flex}.items-center{align-items:center}.items-start{align-items:flex-start}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-1{gap:var(--space-1)}.gap-2{gap:var(--space-2)}.gap-3{gap:var(--space-3)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}.gap-8{gap:var(--space-8)}.flex-1{flex:1}.hide-mobile{display:block}.show-mobile,.hide-desktop{display:none}@media (width<=640px){.hide-mobile{display:none!important}.show-mobile{display:block!important}}@media 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auto;display:flex}.navbar-logo{align-items:center;gap:var(--space-2);font-family:var(--font-heading);font-weight:var(--font-bold);font-size:var(--text-xl);color:var(--color-text);text-decoration:none;display:flex}.navbar-logo .logo-icon{background:var(--gradient-primary);border-radius:var(--radius-md);color:#fff;width:32px;height:32px;font-size:var(--text-lg);justify-content:center;align-items:center;display:flex}.navbar-nav{align-items:center;gap:var(--space-6);display:flex}.navbar-nav a{color:var(--color-text-secondary);font-size:var(--text-sm);font-weight:var(--font-medium);transition:color var(--transition-fast);position:relative}.navbar-nav a:hover,.navbar-nav a.active{color:var(--color-primary)}.navbar-nav 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rgba(var(--color-primary-rgb), .35)}.btn-danger{background:var(--color-danger);color:#fff}.btn-danger:hover{background:var(--color-danger-hover)}.btn-text{color:var(--color-primary);padding:var(--space-2) var(--space-3);background:0 0;border:none}.btn-text:hover{background:var(--color-primary-light)}.btn-sm{font-size:var(--text-xs);padding:6px 14px}.btn-lg{font-size:var(--text-base);padding:14px 28px}.btn-xl{font-size:var(--text-lg);border-radius:var(--radius-lg);padding:16px 36px}.btn-block{width:100%}.btn-icon{border-radius:var(--radius-full);width:40px;height:40px;padding:0}.btn-icon.btn-sm{width:32px;height:32px}.btn-icon.btn-lg{width:48px;height:48px}.btn .ripple{pointer-events:none;background:#fff6;border-radius:50%;animation:.6s linear ripple-anim;position:absolute;transform:scale(0)}@keyframes ripple-anim{to{opacity:0;transform:scale(4)}}.form-select{appearance:none;background:var(--color-surface-raised);color:var(--color-text-secondary);border:1px solid 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var(--transition-base);overflow:hidden}.card:hover{box-shadow:var(--shadow-md);border-color:var(--color-border-hover)}.card-body{padding:var(--space-5)}.card-img{object-fit:cover;width:100%;height:180px;display:block}.card-footer{padding:var(--space-3) var(--space-5);border-top:1px solid var(--color-divider)}.quiz-card{cursor:pointer;position:relative}.quiz-card:hover{transform:translateY(var(--hover-lift));box-shadow:var(--shadow-lg)}.quiz-card .card-cover{background:var(--gradient-card);justify-content:center;align-items:center;height:160px;font-size:3rem;display:flex;position:relative;overflow:hidden}.quiz-card .card-cover:after{content:"";background:var(--gradient-primary);opacity:.05;position:absolute;inset:0}.quiz-card .card-meta{align-items:center;gap:var(--space-3);margin-top:var(--space-3);font-size:var(--text-xs);color:var(--color-text-tertiary);display:flex}.quiz-card 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var(--transition-slow)}.progress-bar-lg{height:10px}.avatar{border-radius:var(--radius-full);background:var(--gradient-primary);color:#fff;width:40px;height:40px;font-weight:var(--font-bold);font-size:var(--text-sm);flex-shrink:0;justify-content:center;align-items:center;display:flex;overflow:hidden}.avatar img{object-fit:cover;width:100%;height:100%}.avatar-sm{width:32px;height:32px;font-size:var(--text-xs)}.avatar-lg{width:56px;height:56px;font-size:var(--text-xl)}.avatar-xl{width:80px;height:80px;font-size:var(--text-2xl)}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:var(--z-modal);padding:var(--space-4);opacity:0;pointer-events:none;transition:opacity var(--transition-base);background:#00000080;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal-overlay.active{opacity:1;pointer-events:all}.modal{background:var(--color-surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);width:100%;max-width:480px;max-height:90vh;transition:transform var(--transition-base);overflow-y:auto;transform:scale(.95)translateY(10px)}.modal-overlay.active .modal{transform:scale(1)translateY(0)}.modal-header{padding:var(--space-5) var(--space-6);border-bottom:1px solid var(--color-divider);justify-content:space-between;align-items:center;display:flex}.modal-header h3{font-size:var(--text-lg);margin:0}.modal-body{padding:var(--space-6)}.modal-footer{padding:var(--space-4) var(--space-6);border-top:1px solid var(--color-divider);justify-content:flex-end;gap:var(--space-3);display:flex}@media (width<=640px){.modal-overlay{align-items:flex-end;padding:0}.modal-overlay .modal{border-radius:var(--radius-xl) var(--radius-xl) 0 0;max-width:100%;transform:translateY(100%)}.modal-overlay.active .modal{transform:translateY(0)}}.toast-container{top:calc(var(--nav-height) + var(--space-4));right:var(--space-4);z-index:var(--z-toast);gap:var(--space-2);flex-direction:column;display:flex;position:fixed}.toast{align-items:center;gap:var(--space-3);padding:var(--space-3) var(--space-4);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);font-size:var(--text-sm);font-weight:var(--font-medium);min-width:280px;max-width:400px;animation:.3s forwards toast-in;display:flex}.toast.toast-exit{animation:.3s forwards toast-out}.toast-success{border-left:3px solid var(--color-success)}.toast-error{border-left:3px solid var(--color-danger)}.toast-warning{border-left:3px solid var(--color-warning)}.toast-info{border-left:3px solid var(--color-info)}.toast .toast-icon{font-size:var(--text-lg);flex-shrink:0}.toast-success 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