:root{--primary-color: #E96D17;--secondary-color: #20069D;--success-color: #37B256;--error-color: #E93640;--grey-color: #B9B9B9;--primary-light: #FF9F4A;--primary-dark: #B54400;--secondary-light: #5A41CC;--secondary-dark: #0D0070;--success-light: #6FD47F;--success-dark: #228B22;--error-light: #FF6B73;--error-dark: #B50E1A;--bg-default: #FAFAFA;--bg-paper: #FFFFFF;--bg-light: #F5F5F5;--text-primary: #263238;--text-secondary: #546E7A;--text-disabled: #B9B9B9;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--radius-xs: 4px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 50%;--shadow-xs: 0 1px 3px rgba(0, 0, 0, .12), 0 1px 2px rgba(0, 0, 0, .24);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .08);--shadow-md: 0 4px 20px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 32px rgba(0, 0, 0, .12);--shadow-xl: 0 12px 48px rgba(0, 0, 0, .16);--font-family: "Inter", "Roboto", "Helvetica", "Arial", sans-serif;--font-weight-normal: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700}*{box-sizing:border-box}body{margin:0;padding:0;font-family:var(--font-family);background-color:var(--bg-default);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.text-primary{color:var(--text-primary)!important}.text-secondary{color:var(--text-secondary)!important}.text-success{color:var(--success-color)!important}.text-error{color:var(--error-color)!important}.text-warning{color:var(--primary-color)!important}.bg-primary{background-color:var(--primary-color)!important}.bg-secondary{background-color:var(--secondary-color)!important}.bg-success{background-color:var(--success-color)!important}.bg-error{background-color:var(--error-color)!important}.bg-light{background-color:var(--bg-light)!important}.modern-card{background:linear-gradient(135deg,#fff,#fafafa);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);border:1px solid rgba(185,185,185,.1);transition:all .3s cubic-bezier(.4,0,.2,1);overflow:hidden}.modern-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}.modern-card-elevated{box-shadow:var(--shadow-lg)}.modern-button{border-radius:var(--radius-md);font-weight:var(--font-weight-semibold);text-transform:none;transition:all .2s cubic-bezier(.4,0,.2,1);padding:var(--spacing-sm) var(--spacing-lg)}.modern-button-primary{background:linear-gradient(135deg,var(--primary-color) 0%,var(--primary-dark) 100%);color:#fff;box-shadow:0 2px 8px #e96d174d}.modern-button-primary:hover{box-shadow:0 4px 12px #e96d1766;transform:translateY(-1px)}.modern-button-secondary{background:linear-gradient(135deg,var(--secondary-color) 0%,var(--secondary-dark) 100%);color:#fff;box-shadow:0 2px 8px #20069d4d}.modern-button-secondary:hover{box-shadow:0 4px 12px #20069d66;transform:translateY(-1px)}.modern-progress{height:8px;border-radius:var(--radius-sm);background-color:#b9b9b933}.modern-progress-bar{height:100%;border-radius:var(--radius-sm);background:linear-gradient(90deg,var(--primary-color) 0%,var(--primary-light) 100%);transition:width .3s ease}.modern-avatar{border-radius:var(--radius-lg);background:linear-gradient(135deg,var(--primary-color) 0%,var(--primary-dark) 100%);color:#fff;font-weight:var(--font-weight-semibold);display:flex;align-items:center;justify-content:center}.modern-badge{border-radius:var(--radius-sm);font-weight:var(--font-weight-medium);font-size:.75rem;padding:var(--spacing-xs) var(--spacing-sm);text-transform:uppercase;letter-spacing:.5px}.modern-badge-success{background-color:#37b2561a;color:var(--success-color);border:1px solid rgba(55,178,86,.2)}.modern-badge-warning{background-color:#e96d171a;color:var(--primary-color);border:1px solid rgba(233,109,23,.2)}.modern-badge-error{background-color:#e936401a;color:var(--error-color);border:1px solid rgba(233,54,64,.2)}.modern-badge-info{background-color:#20069d1a;color:var(--secondary-color);border:1px solid rgba(32,6,157,.2)}.modern-input{border-radius:var(--radius-md);border:1px solid rgba(185,185,185,.3);transition:all .2s ease;padding:var(--spacing-sm) var(--spacing-md);font-family:var(--font-family)}.modern-input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #e96d171a}.modern-nav-item{border-radius:var(--radius-lg);margin:var(--spacing-xs) var(--spacing-sm);transition:all .2s cubic-bezier(.4,0,.2,1);padding:var(--spacing-md)}.modern-nav-item:hover{background-color:#e96d1714;transform:translate(4px)}.modern-nav-item.active{background-color:#e96d171f;border-left:4px solid var(--primary-color);border-radius:0 var(--radius-lg) var(--radius-lg) 0}.modern-spinner{width:40px;height:40px;border:3px solid rgba(233,109,23,.1);border-top:3px solid var(--primary-color);border-radius:var(--radius-full);animation:modernSpin 1s linear infinite}@keyframes modernSpin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.stats-card{background:var(--bg-paper);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);padding:var(--spacing-lg);text-align:center;border:1px solid rgba(185,185,185,.1);position:relative;overflow:hidden}.stats-card:before{content:"";position:absolute;top:0;right:0;width:60px;height:60px;background:linear-gradient(135deg,var(--primary-color) 0%,var(--primary-light) 100%);opacity:.1;border-radius:0 0 0 60px}.chart-container{background:var(--bg-paper);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:var(--spacing-lg);border:1px solid rgba(185,185,185,.1)}@media (max-width: 768px){.modern-card{border-radius:var(--radius-lg)}.stats-card,.chart-container{padding:var(--spacing-md)}}.fade-in{animation:fadeIn .5s ease-in-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.slide-in-left{animation:slideInLeft .3s ease-out}@keyframes slideInLeft{0%{opacity:0;transform:translate(-30px)}to{opacity:1;transform:translate(0)}}.scale-in{animation:scaleIn .3s cubic-bezier(.4,0,.2,1)}@keyframes scaleIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg-light);border-radius:var(--radius-sm)}::-webkit-scrollbar-thumb{background:#e96d174d;border-radius:var(--radius-sm);transition:background .2s ease}::-webkit-scrollbar-thumb:hover{background:#e96d1780}.mobile-only{display:block}.desktop-only{display:none}@media (min-width: 768px){.mobile-only{display:none}.desktop-only{display:block}}.course-sidebar-sticky{position:sticky;top:20px;align-self:flex-start}.course-layout-responsive{display:flex;gap:1.5rem;flex-direction:column}@media (min-width: 768px){.course-layout-responsive{flex-direction:row}}@media (hover: none) and (pointer: coarse){.course-navigation .MuiButton-root{min-height:48px;padding:12px 24px}.course-sidebar .MuiListItemButton-root{min-height:48px;padding:12px 16px}.course-drawer .MuiIconButton-root{padding:12px}}button:focus,input:focus,select:focus,textarea:focus,[tabindex]:focus{outline:2px solid var(--primary-color);outline-offset:2px}@media (prefers-contrast: high){.modern-card{border:2px solid var(--text-primary)}.modern-badge{border-width:2px}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.tinymce-content{line-height:1.55}.tinymce-content p{margin:.35em 0}.tinymce-content p:first-child{margin-top:0}.tinymce-content p:last-child{margin-bottom:0}.tinymce-content h1{margin:.75em 0 .35em;font-size:2em;font-weight:var(--font-weight-bold);line-height:1.2}.tinymce-content h2{margin:.65em 0 .35em;font-size:1.5em;font-weight:var(--font-weight-bold);line-height:1.3}.tinymce-content h3{margin:.55em 0 .3em;font-size:1.25em;font-weight:var(--font-weight-semibold);line-height:1.4}.tinymce-content h4{margin:.5em 0 .25em;font-size:1.1em;font-weight:var(--font-weight-semibold);line-height:1.4}.tinymce-content h5{margin:.45em 0 .25em;font-size:1em;font-weight:var(--font-weight-semibold);line-height:1.5}.tinymce-content h6{margin:.45em 0 .25em;font-size:.9em;font-weight:var(--font-weight-semibold);line-height:1.5}.tinymce-content h1:first-child,.tinymce-content h2:first-child,.tinymce-content h3:first-child,.tinymce-content h4:first-child,.tinymce-content h5:first-child,.tinymce-content h6:first-child{margin-top:0}.tinymce-content ul,.tinymce-content ol{margin:.35em 0;padding-left:1.5em}.tinymce-content li{margin:.2em 0}.tinymce-content blockquote{margin:.5em 0;padding-left:1em;border-left:3px solid var(--primary-color);color:var(--text-secondary)}.tinymce-content pre{margin:.5em 0;padding:1em;background-color:var(--bg-light);border-radius:var(--radius-sm);overflow-x:auto}.tinymce-content code{background-color:var(--bg-light);padding:.2em .4em;border-radius:var(--radius-xs);font-family:Courier New,Courier,monospace;font-size:.9em}.tinymce-content pre code{background-color:transparent;padding:0}.tinymce-content table{margin:.5em 0;border-collapse:collapse;width:100%}.tinymce-content table td,.tinymce-content table th{padding:.5em;border:1px solid var(--grey-color)}.tinymce-content table th{background-color:var(--bg-light);font-weight:var(--font-weight-semibold)}.tinymce-content img{max-width:100%;height:auto;border-radius:var(--radius-sm);margin:.5em 0}.tinymce-content a{color:var(--primary-color);text-decoration:none;transition:color .2s ease}.tinymce-content a:hover{color:var(--primary-dark);text-decoration:underline}.tinymce-content hr{margin:1em 0;border:none;border-top:1px solid var(--grey-color)}.tinymce-content strong,.tinymce-content b{font-weight:var(--font-weight-bold)}.tinymce-content em,.tinymce-content i{font-style:italic}