:root{--sidebar-width: 80px;--sidebar-bg: #ffffff;--sidebar-border: #e5e7eb;--sidebar-text: #6b7280;--sidebar-text-dark: #374151;--sidebar-hover-bg: #f3f4f6;--sidebar-active-bg: rgba(0, 174, 239, .1);--sidebar-active-text: #00aeef;--sidebar-transition: .2s ease}.sidebar-root{position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-width);background:var(--sidebar-bg);border-right:1px solid var(--sidebar-border);z-index:100;display:flex;flex-direction:column;overflow:visible}.sidebar-inner{display:flex;flex-direction:column;height:100%;overflow:visible}.sidebar-logo-area{display:flex;align-items:center;justify-content:center;padding:20px 0 16px;flex-shrink:0}.sidebar-logo-img{width:36px;height:36px;object-fit:contain;cursor:default}.sidebar-nav-main,.sidebar-nav-bottom{display:flex;flex-direction:column;align-items:center;gap:24px}.sidebar-nav-main{flex:1;padding:16px 0 0}.sidebar-nav-bottom{flex-shrink:0;padding:20px 0;border-top:1px solid var(--sidebar-border)}.sidebar-nav-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;border:none;background:transparent;color:var(--sidebar-text);cursor:pointer;transition:color .15s ease;position:relative;font-family:Inter,sans-serif;padding:0}.sidebar-nav-btn:hover{color:var(--sidebar-active-text)}.sidebar-nav-btn:hover .sidebar-nav-icon-box{background:var(--sidebar-active-bg)}.sidebar-nav-btn.active{color:var(--sidebar-active-text)}.sidebar-nav-icon-box{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;background:transparent;transition:background .15s ease;position:relative}.sidebar-nav-btn.active .sidebar-nav-icon-box{background:var(--sidebar-active-bg)}.sidebar-nav-btn.active .sidebar-nav-icon-box:before{content:"";position:absolute;left:-18px;top:50%;transform:translateY(-50%);width:3px;height:24px;background:var(--sidebar-active-text);border-radius:0 3px 3px 0}.sidebar-nav-icon{flex-shrink:0}.sidebar-nav-label{font-size:12px;font-weight:500;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:72px;text-align:center}.sidebar-nav-btn.active .sidebar-nav-label{font-weight:600}.sidebar-profile-wrapper{position:relative;display:flex;justify-content:center}.sidebar-avatar-btn{display:flex;align-items:center;justify-content:center;border:none;background:transparent;cursor:pointer;padding:3px;border-radius:50%;transition:all .15s ease}.sidebar-avatar-btn:hover,.sidebar-avatar-btn.active{background:var(--sidebar-hover-bg)}.sidebar-avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,#00aeef,#0077b6);color:#fff;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:600;font-family:Inter,sans-serif;user-select:none}.sidebar-profile-popup{position:fixed;width:260px;background:#fff;border:1px solid var(--sidebar-border);border-radius:12px;box-shadow:0 8px 30px #0000001f,0 2px 8px #0000000f;padding:0;z-index:9999;animation:popupSlideIn .15s ease;overflow:hidden;bottom:20px;left:calc(var(--sidebar-width) + 10px)}@keyframes popupSlideIn{0%{opacity:0;transform:translate(-6px)}to{opacity:1;transform:translate(0)}}.sidebar-popup-header{display:flex;align-items:center;gap:12px;padding:16px}.sidebar-popup-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.sidebar-popup-name{font-size:14px;font-weight:600;color:#111827;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-family:Inter,sans-serif}.sidebar-popup-email{font-size:12px;color:#6b7280;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-family:Inter,sans-serif}.sidebar-popup-role-badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:20px;font-size:11px;font-weight:700;letter-spacing:.04em;width:fit-content;font-family:Inter,sans-serif}.sidebar-popup-role-badge.admin{background:#00aeef1a;color:#00aeef}.sidebar-popup-role-badge.instructor{background:#fce4ec;color:#e91e63}.sidebar-popup-sessions{display:flex;flex-wrap:wrap;gap:4px}.sidebar-popup-session-tag{font-size:11px;color:#6b7280;padding:2px 8px;background:#f3f4f6;border-radius:4px;font-family:Inter,sans-serif}.sidebar-popup-divider{height:1px;background:var(--sidebar-border)}.sidebar-popup-logout{display:flex;align-items:center;gap:10px;width:100%;padding:12px 16px;border:none;background:transparent;color:#6b7280;font-size:13px;font-weight:500;cursor:pointer;transition:all .15s ease;font-family:Inter,sans-serif}.sidebar-popup-logout:hover{background:#ef44440f;color:#ef4444}.sidebar-mobile-toggle{display:none;position:fixed;top:12px;left:12px;z-index:150;width:40px;height:40px;border:none;border-radius:10px;background:#fff;color:#374151;box-shadow:0 2px 8px #0000001f;cursor:pointer;align-items:center;justify-content:center;transition:all .15s ease}.sidebar-mobile-toggle:hover{background:#f3f4f6}.sidebar-mobile-overlay{display:none;position:fixed;inset:0;background:#0000004d;z-index:90}.page-fade-out{animation:pageFadeOut .15s ease forwards}.page-slide-in{animation:pageSlideIn .3s ease forwards}@keyframes pageFadeOut{0%{opacity:1}to{opacity:0;transform:translateY(4px)}}@keyframes pageSlideIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media(max-width:768px){.sidebar-root{transform:translate(-100%);transition:transform var(--sidebar-transition);box-shadow:none}.sidebar-root.mobile-open{transform:translate(0);box-shadow:4px 0 24px #0000001f}.sidebar-mobile-toggle{display:flex}.sidebar-mobile-overlay{display:block}.app-main-content{margin-left:0!important;width:100%!important}}