:root{--nusantara-blue:#0857c3;--cakrawala-blue:#307fe2;--mentari-blue:#71c5e8;--hamburger-size-sm:40px;--hamburger-size-md:46px;--hamburger-bottom-sm:22px;--hamburger-right-sm:72px;--hamburger-bottom-md:35px;--hamburger-right-md:92px;--transition-fast:0.25s ease;--transition-medium:0.35s ease}.bri-nusantara{color:var(--nusantara-blue)}.bri-cakrawala{color:var(--cakrawala-blue)}.bri-mentari{color:var(--mentari-blue)}.bri-nusantara-bg,.bri-nusantara-btn{background-color:var(--nusantara-blue)}.bri-nusantara-btn{color:#fff;border:none;transition:background-color var(--transition-fast),transform var(--transition-fast),box-shadow var(--transition-fast)}.bri-nusantara-btn:disabled{background-color:var(--mentari-blue);color:#fff;cursor:not-allowed}.bri-nusantara-btn:hover{background-color:var(--cakrawala-blue);color:#fff;transform:translateY(-1px);box-shadow:0 8px 20px rgba(0,0,0,.15)}.hamburger-materi{position:fixed;bottom:var(--hamburger-bottom-sm);right:var(--hamburger-right-sm);z-index:1050}.hamburger-materi button{width:var(--hamburger-size-sm);height:var(--hamburger-size-sm);border-radius:50%}.accordion-button.collapsed .icon-check{color:green}.accordion-button:not(.collapsed) .icon-check{color:#fff}@media(min-width:992px){.hamburger-materi{bottom:var(--hamburger-bottom-md);right:var(--hamburger-right-md)}.hamburger-materi button{width:var(--hamburger-size-md);height:var(--hamburger-size-md)}}.lesson-layout{display:flex;height:100vh;overflow-y:auto;background-color:#fff;font-family:Inter,Montserrat,sans-serif}.ql-align-center{text-align:center}.ql-align-right{text-align:right}.ql-align-justify{text-align:justify}@media(max-width:991px){.lesson-layout{height:auto!important;overflow:visible!important}}.lesson-sidebar{width:80px;height:100vh;background-color:#fff;border-right:1px solid #e8ecf1;display:flex;flex-direction:column;align-items:center;padding:16px 0;position:fixed;top:0;left:0;z-index:100;flex-shrink:0}.lesson-sidebar__logo{margin-bottom:32px}.lesson-sidebar__logo-link{display:flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:12px;background-color:var(--nusantara-blue);color:#fff;text-decoration:none;transition:background-color .2s ease,transform .2s ease}.lesson-sidebar__logo-link:hover{background-color:var(--cakrawala-blue);color:#fff;transform:scale(1.05)}.lesson-sidebar__nav{display:flex;flex-direction:column;align-items:center;gap:8px;width:100%}.lesson-sidebar__nav--top{flex:1 1}.lesson-sidebar__nav--bottom{margin-top:auto;padding-bottom:8px}.lesson-sidebar__nav-item{display:flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:12px;color:#94a3b8;text-decoration:none;transition:all .2s ease;position:relative}.lesson-sidebar__nav-item:hover{background-color:rgba(8,87,195,.08);color:var(--nusantara-blue)}.lesson-sidebar__nav-item--active{background-color:rgba(8,87,195,.12);color:var(--nusantara-blue)}.lesson-sidebar__nav-item--active:before{content:"";position:absolute;left:-12px;top:50%;transform:translateY(-50%);width:4px;height:24px;border-radius:0 4px 4px 0;background-color:var(--nusantara-blue)}.lesson-sidebar__avatar{width:36px;height:36px;border-radius:50%;background-color:var(--nusantara-blue);overflow:hidden;display:flex;align-items:center;justify-content:center;margin-top:12px;cursor:pointer;border:2px solid rgba(8,87,195,.2);transition:border-color .2s ease}.lesson-sidebar__avatar:hover{border-color:var(--nusantara-blue)}.lesson-sidebar__avatar img{width:100%;height:100%;object-fit:cover}.lesson-main{flex:1 1;background-color:#fff;height:100vh;overflow:hidden;margin-left:80px}.lesson-grid{display:flex;height:100vh;width:100%}.lesson-col-left{width:33.333%;padding:32px 24px;border-right:1px solid #e8ecf1}.lesson-col-left,.lesson-col-right{box-sizing:border-box;overflow-y:auto;height:100%}.lesson-col-right{width:66.667%;padding:32px 40px;background-color:#fcfcfc}.lesson-tutor{display:flex;align-items:center;gap:12px;margin-bottom:28px}.lesson-tutor__avatar{width:44px;height:44px;border-radius:50%;background-color:#e8ecf1;overflow:hidden;flex-shrink:0}.lesson-tutor__avatar img{width:100%;height:100%;object-fit:cover}.lesson-tutor__info h4{font-size:.95rem;font-weight:600;color:#1e293b;margin:0 0 2px}.lesson-tutor__info span{font-size:.8rem;color:#94a3b8}.lesson-tutor__follow{margin-left:auto;width:28px;height:28px;border-radius:50%;border:1.5px solid #e2e8f0;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#94a3b8;transition:all .2s ease;background:none}.lesson-tutor__follow:hover{border-color:var(--nusantara-blue);color:var(--nusantara-blue)}.lesson-course-title{font-size:1.35rem;font-weight:700;color:#0f172a;line-height:1.4;margin-bottom:16px;letter-spacing:-.02em}.lesson-course-desc{font-size:.88rem;color:#64748b;line-height:1.7;margin-bottom:28px}.lesson-achievements{display:flex;gap:16px;margin-bottom:32px;padding-bottom:28px;border-bottom:1px solid #e8ecf1}.lesson-achievement-item{flex:1 1;text-align:center}.lesson-achievement-item__icon{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;margin:0 auto 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#e8ecf1;border-radius:24px;overflow:hidden;box-shadow:0 12px 32px rgba(0,0,0,.05);margin-bottom:32px}.lesson-file-viewer__header{display:flex;align-items:center;justify-content:space-between;padding:12px 32px;background-color:var(--nusantara-blue);color:#fff}.lesson-file-viewer__header span{display:flex;align-items:center;gap:8px;font-size:.85rem;font-weight:500}.lesson-file-viewer__header a{color:#fff;text-decoration:none;font-size:.8rem;display:flex;align-items:center;gap:4px;padding:4px 12px;border-radius:20px;background:hsla(0,0%,100%,.15);transition:background .2s}.lesson-file-viewer__header a:hover{background:hsla(0,0%,100%,.25);color:#fff}@media(max-width:991px){.lesson-sidebar{display:none}.lesson-main{margin-left:0;height:auto!important;overflow:visible!important;padding-top:75px}.mobile-nav-header{position:fixed;top:0;left:0;right:0;height:60px;background:#fff;border-bottom:1px solid #e2e8f0;display:flex;align-items:center;justify-content:space-between;padding:0 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.std-sidebar-label{opacity:0;width:0;visibility:hidden;margin-left:-14px}.std-sidebar-item.active{background:#f1f5f9;color:#0857c3;position:relative}.std-sidebar-item.active:before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:24px;background:#0857c3;border-radius:0 4px 4px 0}.std-sidebar.collapsed .std-sidebar-item.active{background:#eff6ff;color:#0857c3}.std-sidebar-toggle-area{padding:16px 12px;border-top:1px solid #f1f5f9}.std-sidebar-toggle{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:12px;border-radius:14px;border:none;background:#f8fafc;color:#64748b;cursor:pointer;transition:all .2s;font-size:.85rem;font-weight:600;white-space:nowrap;overflow:hidden}.std-sidebar-toggle:hover{background:#eff6ff;color:#0857c3}.std-greeting{margin-bottom:32px}.std-greeting h2{font-size:1.6rem;font-weight:800;color:#003f8a;margin:0}.std-greeting 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