:root{--brand-blue:#0056d2;--brand-blue-hover:#0044a8;--brand-blue-light:#ebf3ff;--text-primary:#1f2937;--text-secondary:#4b5563;--text-tertiary:#6b7280;--text-inverse:#fff;--bg-primary:#fff;--bg-secondary:#f3f4f6;--bg-tertiary:#e5e7eb;--bg-inverse:#111827;--accent-yellow:#facc15;--accent-green:#10b981;--accent-red:#ef4444;--border-light:#e5e7eb;--border-strong:#d1d5db;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;--shadow-xl:0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;--shadow-brand:0 10px 15px -3px #0056d233;--container-max:1280px;--spacing-xs:.25rem;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--spacing-3xl:4rem;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-normal:.3s cubic-bezier(.4, 0, .2, 1);--transition-slow:.5s cubic-bezier(.4, 0, .2, 1);--radius-sm:.25rem;--radius-md:.5rem;--radius-lg:.75rem;--radius-xl:1rem;--radius-full:9999px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{color:var(--text-primary);background-color:var(--bg-secondary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;overflow-x:hidden}a{color:inherit;text-decoration:none}button{cursor:pointer;background:0 0;border:none;font-family:inherit}ul{list-style:none}.container{max-width:var(--container-max);padding:0 var(--spacing-xl);margin:0 auto}.text-h1{letter-spacing:-.02em;font-size:3rem;font-weight:800;line-height:1.2}.text-h2{letter-spacing:-.01em;font-size:2.25rem;font-weight:700;line-height:1.2}.text-h3{font-size:1.5rem;font-weight:600;line-height:1.3}.text-body-large{font-size:1.125rem;line-height:1.6}.text-body{font-size:1rem;line-height:1.5}.text-small{font-size:.875rem;line-height:1.4}.text-brand{color:var(--brand-blue)}.text-primary{color:var(--text-primary)}.text-secondary{color:var(--text-secondary)}.text-inverse{color:var(--text-inverse)}.font-medium{font-weight:500}.font-semibold{font-weight:600}.font-bold{font-weight:700}.text-center{text-align:center}.text-left{text-align:left}.text-right{text-align:right}.flex{display:flex}.flex-col{flex-direction:column;display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-xs{gap:var(--spacing-xs)}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.gap-xl{gap:var(--spacing-xl)}.wrap{flex-wrap:wrap}.grid{display:grid}.grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}.dropdown-item:hover{background-color:var(--bg-secondary)}.btn{padding:var(--spacing-sm) var(--spacing-lg);border-radius:var(--radius-md);transition:all var(--transition-normal);text-align:center;justify-content:center;align-items:center;font-weight:600;display:inline-flex}.btn-primary{background-color:var(--brand-blue);color:var(--text-inverse);box-shadow:var(--shadow-sm)}.btn-primary:hover{background-color:var(--brand-blue-hover);box-shadow:var(--shadow-brand);transform:translateY(-1px)}.btn-secondary{background-color:var(--bg-primary);color:var(--brand-blue);border:1px solid var(--brand-blue)}.btn-secondary:hover{background-color:var(--brand-blue-light)}.btn-ghost{color:var(--text-secondary)}.btn-ghost:hover{color:var(--brand-blue);background-color:var(--bg-secondary)}.glass{-webkit-backdrop-filter:blur(12px);background:#ffffffd9;border-bottom:1px solid #ffffff4d}.animate-fade-in{animation:fadeIn var(--transition-slow) forwards}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.hover-scale{transition:transform var(--transition-normal), box-shadow var(--transition-normal)}.hover-scale:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}.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)}.p-sm{padding:var(--spacing-sm)}.p-md{padding:var(--spacing-md)}.p-lg{padding:var(--spacing-lg)}.p-xl{padding:var(--spacing-xl)}.p-2xl{padding:var(--spacing-2xl)}.p-3xl{padding:var(--spacing-3xl)}.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)}@media (width<=1024px){.text-h1{font-size:2.5rem}.text-h2{font-size:1.85rem}.text-h3{font-size:1.35rem}.grid-cols-4,.grid-cols-3{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=640px){.text-h1{font-size:2rem}.text-h2{font-size:1.5rem}.text-h3{font-size:1.2rem}.grid-cols-4,.grid-cols-3,.grid-cols-2{grid-template-columns:1fr}.p-2xl,.p-3xl{padding:var(--spacing-xl)}.py-2xl,.py-3xl{padding-top:var(--spacing-xl);padding-bottom:var(--spacing-xl)}}.auth-grid{grid-template-columns:1fr 1fr;min-height:calc(100vh - 80px);display:grid}.editor-grid{grid-template-columns:1fr 360px;align-items:start;gap:2rem;display:grid}.dashboard-layout{grid-template-columns:1fr 320px;gap:2rem;display:grid}.catalog-layout{grid-template-columns:280px 1fr;gap:2rem;display:grid}.details-layout{grid-template-columns:1fr 350px;gap:2rem;display:grid}.split-grid{grid-template-columns:1fr 1fr;gap:1rem;display:grid}@media (width<=900px){.auth-grid,.editor-grid,.dashboard-layout,.catalog-layout,.details-layout,.split-grid,.grid-cols-2{grid-template-columns:1fr}.hide-on-mobile{display:none!important}.flex-col-mobile{flex-direction:column!important}.w-full-mobile{width:100%!important;max-width:100%!important}.container{padding:0 var(--spacing-md)}}.enrollment-card{background-color:var(--bg-primary);border-radius:var(--radius-xl);padding:var(--spacing-xl);box-shadow:var(--shadow-sm);border:1px solid var(--border-light);gap:2rem;display:flex}@media (width<=640px){.enrollment-card{padding:var(--spacing-md);flex-direction:column;gap:1.25rem}.enrollment-card .thumbnail{width:100%!important;height:160px!important}}.mobile-nav-toggle{color:var(--text-primary);cursor:pointer;padding:.5rem;display:none}@media (width<=900px){.mobile-nav-toggle{display:block}}.mobile-menu-drawer{background-color:var(--bg-primary);border-bottom:1px solid var(--border-light);padding:var(--spacing-lg) var(--spacing-md);box-shadow:var(--shadow-lg);gap:var(--spacing-md);z-index:99;flex-direction:column;display:none;position:absolute;top:100%;left:0;right:0}.mobile-menu-drawer.open{display:flex}.responsive-table-container{-webkit-overflow-scrolling:touch;width:100%;overflow-x:auto}@media (width<=900px){.catalog-layout aside{background-color:var(--bg-primary);z-index:100;width:320px;max-width:85%;box-shadow:var(--shadow-xl);padding:var(--spacing-lg) var(--spacing-md);transition:right .3s ease-in-out;position:fixed;top:0;bottom:0;right:-100%;overflow-y:auto;display:flex!important}.catalog-layout aside.open{right:0}.catalog-layout .drawer-overlay{z-index:90;background-color:#00000080;display:block;position:fixed;inset:0}}@media (width>=901px){.catalog-layout .drawer-overlay{display:none}}.hide-on-desktop{display:none!important}@media (width<=900px){.hide-on-desktop{display:flex!important}}.player-layout{height:calc(100vh - 80px);display:flex}.player-sidebar{background-color:var(--bg-primary);border-right:1px solid var(--border-light);flex-direction:column;width:350px;display:flex;overflow-y:auto}.player-content{background-color:var(--bg-secondary);flex-direction:column;flex:1;display:flex;overflow-y:auto}@media (width<=900px){.player-layout{flex-direction:column;height:auto;min-height:calc(100vh - 80px)}.player-sidebar{border-right:none;border-top:1px solid var(--border-light);order:2;width:100%;height:400px}.player-content{z-index:30;background-color:var(--bg-secondary);flex:none;order:1;position:sticky;top:80px}}@keyframes shimmer{0%{background-position:-1000px 0}to{background-position:1000px 0}}.skeleton-shimmer{background:var(--bg-tertiary);background-image:linear-gradient(to right, var(--bg-tertiary) 0%, var(--border-light) 20%, var(--bg-tertiary) 40%, var(--bg-tertiary) 100%);background-repeat:no-repeat;background-size:1000px 100%;animation:2.5s linear infinite forwards shimmer}