:root{--primary:#ce0061;--primary-hover:#a0004b;--primary-light:#fdf2f7;--dark:#0f171f;--dark-rgb:15, 23, 31;--text:#1c252e;--text-muted:#6a6d74;--background:#fff;--sidebar-bg:#f6f7f8;--border:#dcdfe3;--shadow-sm:0 1px 3px #0000000d, 0 1px 2px #0000001a;--shadow-md:0 4px 6px -1px #0000000d, 0 2px 4px -1px #00000008;--shadow-lg:0 10px 15px -3px #0000000d, 0 4px 6px -2px #00000005;--transition:all .25s cubic-bezier(.4, 0, .2, 1);--font-heading:"Poppins", sans-serif;--font-body:"DM Sans", sans-serif;--sidebar-width:320px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);color:var(--text);background-color:var(--background);flex-direction:column;height:100vh;line-height:1.6;display:flex;overflow:hidden}.app-container{flex:1;height:calc(100vh - 136px);display:flex;position:relative}header{border-bottom:1px solid var(--border);z-index:10;height:64px;box-shadow:var(--shadow-sm);background-color:#fff;justify-content:space-between;align-items:center;padding:0 24px;display:flex}.header-left{align-items:center;gap:16px;display:flex}.logo-container img{object-fit:contain;max-height:36px}.course-title{font-family:var(--font-heading);color:var(--dark);white-space:nowrap;text-overflow:ellipsis;max-width:450px;font-size:1.1rem;font-weight:700;overflow:hidden}.header-right{align-items:center;gap:20px;display:flex}.progress-wrapper{color:var(--text-muted);align-items:center;gap:12px;font-size:.85rem;font-weight:500;display:flex}.progress-bar-container{background-color:var(--border);border-radius:4px;width:140px;height:8px;overflow:hidden}.progress-bar-fill{background-color:var(--primary);width:0%;height:100%;transition:var(--transition);border-radius:4px}.menu-toggle{border:1px solid var(--border);cursor:pointer;font-family:var(--font-body);transition:var(--transition);background:0 0;border-radius:6px;align-items:center;gap:8px;padding:8px 12px;font-size:.9rem;font-weight:500;display:flex}.menu-toggle:hover{background-color:var(--sidebar-bg);border-color:var(--primary);color:var(--primary)}.sidebar{width:var(--sidebar-width);background-color:var(--sidebar-bg);border-right:1px solid var(--border);height:100%;transition:var(--transition);z-index:5;flex-direction:column;display:flex;overflow-y:auto}.sidebar.collapsed{margin-left:calc(-1 * var(--sidebar-width))}.sidebar-header{border-bottom:1px solid var(--border);font-family:var(--font-heading);color:var(--dark);padding:16px 20px;font-size:.95rem;font-weight:600}.slide-list{list-style:none}.slide-item{cursor:pointer;transition:var(--transition);color:var(--text);border-bottom:1px solid #0000000a;align-items:flex-start;gap:12px;padding:12px 20px;font-size:.9rem;font-weight:500;display:flex}.slide-item:hover{background-color:#ce00610a}.slide-item.active{background-color:var(--primary-light);border-left:4px solid var(--primary);color:var(--primary);padding-left:16px}.slide-item.completed .status-icon:after{content:"✓";color:#10b981;font-weight:700}.status-icon{border:1.5px solid var(--border);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:18px;height:18px;margin-top:2px;font-size:.75rem;display:flex}.slide-item.active .status-icon{border-color:var(--primary)}.slide-item.completed .status-icon{background-color:#ecfdf5;border-color:#10b981}.slide-title-text{white-space:nowrap;text-overflow:ellipsis;flex:1;overflow:hidden}main{background-color:#fff;flex:1;justify-content:center;height:100%;padding:40px 24px;display:flex;overflow-y:auto}.slide-container{flex-direction:column;gap:24px;width:100%;max-width:800px;display:flex}.slide-header{border-bottom:2px solid var(--border);margin-bottom:8px;padding-bottom:16px}.slide-meta-label{text-transform:uppercase;color:var(--primary);letter-spacing:.5px;font-size:.8rem;font-weight:700}.slide-main-title{font-family:var(--font-heading);color:var(--dark);margin-top:4px;font-size:2rem;font-weight:700}.slide-content-text{color:var(--text);font-size:1.05rem}.slide-content-text p{margin-bottom:16px}.slide-content-text ul,.slide-content-text ol{margin-bottom:20px;padding-left:24px}.slide-content-text li{margin-bottom:8px}.slide-content-text img{object-fit:cover;width:100%;height:auto;display:block}.slide-asset-container{width:100%;box-shadow:var(--shadow-md);border:1px solid var(--border);border-radius:8px;margin:16px 0;overflow:hidden}.slide-asset-container img{object-fit:cover;width:100%;height:auto;display:block}.audio-player{background-color:var(--sidebar-bg);border:1px solid var(--border);box-shadow:var(--shadow-sm);border-radius:12px;align-items:center;gap:16px;margin:16px 0;padding:16px 20px;display:flex}.audio-control-btn{background-color:var(--primary);cursor:pointer;color:#fff;width:44px;height:44px;transition:var(--transition);border:none;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;display:flex}.audio-control-btn:hover{background-color:var(--primary-hover);transform:scale(1.05)}.audio-control-btn svg{fill:currentColor;width:18px;height:18px}.audio-progress-container{flex-direction:column;flex:1;gap:4px;display:flex}.audio-time-row{color:var(--text-muted);justify-content:space-between;font-size:.8rem;font-weight:500;display:flex}.audio-slider-wrapper{background-color:var(--border);cursor:pointer;border-radius:3px;width:100%;height:6px;position:relative}.audio-slider-fill{background-color:var(--primary);border-radius:3px;width:0%;height:100%}.accordion-group{flex-direction:column;gap:12px;margin:16px 0;display:flex}.accordion-item{border:1.5px solid var(--border);transition:var(--transition);background-color:#fff;border-radius:8px}.accordion-item.open{border-color:var(--primary);box-shadow:var(--shadow-md)}.accordion-trigger{text-align:left;width:100%;font-family:var(--font-heading);color:var(--dark);cursor:pointer;transition:var(--transition);background:0 0;border:none;justify-content:space-between;align-items:center;padding:16px 20px;font-size:1.05rem;font-weight:600;display:flex}.accordion-trigger:hover{background-color:var(--sidebar-bg)}.accordion-item.open .accordion-trigger{background-color:var(--primary-light);color:var(--primary)}.accordion-icon{color:var(--text-muted);transition:transform .25s}.accordion-item.open .accordion-icon{color:var(--primary);transform:rotate(180deg)}.accordion-content{grid-template-rows:0fr;transition:grid-template-rows .35s ease-in-out;display:grid;overflow:hidden}.accordion-item.open .accordion-content{grid-template-rows:1fr}.accordion-inner-body{min-height:0;color:var(--text);padding:0;font-size:1rem}.accordion-item.open .accordion-content{padding:20px}.accordion-inner-body p{margin-bottom:12px}.accordion-inner-body ul{margin-bottom:12px;padding-left:20px}.accordion-inner-body li{margin-bottom:6px}.transcript-collapse{border:1px solid var(--border);background-color:#fff;border-radius:8px;margin:24px 0 12px}.transcript-trigger{text-align:left;width:100%;color:var(--text-muted);cursor:pointer;background:0 0;border:none;justify-content:space-between;align-items:center;padding:12px 20px;font-size:.9rem;font-weight:600;display:flex}.transcript-trigger:hover{color:var(--primary)}.transcript-content{border-top:1px solid var(--border);background-color:var(--sidebar-bg);color:var(--text);max-height:350px;padding:16px 20px;font-size:.95rem;display:none;overflow-y:auto}.transcript-collapse.open .transcript-content{display:block}.transcript-collapse.open .transcript-trigger svg{transform:rotate(180deg)}.quiz-container{border:1px solid var(--border);box-shadow:var(--shadow-sm);background-color:#fff;border-radius:12px;margin:16px 0;padding:24px}.quiz-question-text{color:var(--dark);margin-bottom:16px;font-size:1.15rem;font-weight:600}.quiz-options{flex-direction:column;gap:10px;margin-bottom:20px;display:flex}.quiz-option-card{border:1.5px solid var(--border);cursor:pointer;transition:var(--transition);background-color:#fff;border-radius:8px;align-items:flex-start;gap:12px;padding:14px 18px;font-weight:500;display:flex}.quiz-option-card:hover{background-color:#ce006105;border-color:var(--primary-hover)!important}.quiz-option-card.selected{border-color:var(--primary);background-color:var(--primary-light)}.quiz-checkbox,.quiz-radio{border:2px solid var(--border);width:20px;height:20px;transition:var(--transition);flex-shrink:0;justify-content:center;align-items:center;margin-top:2px;display:inline-flex}.quiz-radio{border-radius:50%}.quiz-checkbox{border-radius:4px}.quiz-option-card.selected .quiz-radio:after{content:"";background-color:var(--primary);border-radius:50%;width:10px;height:10px}.quiz-option-card.selected .quiz-checkbox:after{content:"✓";color:#fff;font-size:.8rem;font-weight:700}.quiz-option-card.selected .quiz-checkbox{background-color:var(--primary);border-color:var(--primary)}.quiz-option-card.selected .quiz-radio{border-color:var(--primary)}.quiz-btn-row{justify-content:flex-end;display:flex}.quiz-btn{background-color:var(--primary);color:#fff;font-family:var(--font-body);cursor:pointer;transition:var(--transition);border:none;border-radius:6px;padding:10px 24px;font-size:.95rem;font-weight:600}.quiz-btn:hover{background-color:var(--primary-hover)}.quiz-btn:disabled{background-color:var(--border);color:var(--text-muted);cursor:not-allowed}.quiz-feedback-box{border-radius:8px;margin-top:20px;padding:16px;font-size:.95rem;animation:.3s slideDown;display:block}.quiz-feedback-box.correct{color:#065f46;background-color:#ecfdf5;border-left:4px solid #10b981}.quiz-feedback-box.incorrect{color:#991b1b;background-color:#fef2f2;border-left:4px solid #ef4444}.quiz-feedback-box.survey{color:#000;background-color:#fafafa;border-left:4px solid #d5d5d5}.feedback-title{margin-bottom:6px;font-size:1.05rem;font-weight:700}.match-table{border-collapse:separate;border-spacing:0 10px;width:100%;margin-bottom:20px}.match-row{background-color:var(--sidebar-bg);border:1px solid var(--border);border-radius:8px}.match-left{border:1px solid var(--border);border-right:none;border-radius:8px 0 0 8px;width:50%;padding:14px 16px;font-weight:600}.match-right{border:1px solid var(--border);border-left:none;border-radius:0 8px 8px 0;width:50%;padding:14px 16px}.match-select{border:1.5px solid var(--border);width:100%;font-family:var(--font-body);cursor:pointer;transition:var(--transition);background-color:#fff;border-radius:6px;outline:none;padding:10px 14px;font-size:.95rem}.match-select:focus{border-color:var(--primary)}.match-row.correct-row{background-color:#ecfdf5}.match-row.correct-row .match-left,.match-row.correct-row .match-right{border-color:#10b981}.match-row.incorrect-row{background-color:#fef2f2}.match-row.incorrect-row .match-left,.match-row.incorrect-row .match-right{border-color:#ef4444}footer{border-top:1px solid var(--border);z-index:10;background-color:#fff;justify-content:space-between;align-items:center;height:72px;padding:0 24px;display:flex;box-shadow:0 -2px 10px #00000005}.nav-btn{font-family:var(--font-body);cursor:pointer;transition:var(--transition);border-radius:6px;align-items:center;gap:8px;padding:10px 24px;font-size:.95rem;font-weight:600;display:inline-flex}.btn-outline{border:1.5px solid var(--border);color:var(--text);background-color:#0000}.btn-outline:hover{background-color:var(--sidebar-bg);border-color:var(--text-muted)}.btn-outline:disabled{color:var(--border);border-color:var(--border);cursor:not-allowed;background-color:#0000}.btn-solid{background-color:var(--primary);color:#fff;border:none}.btn-solid:hover{background-color:var(--primary-hover)}.btn-solid:disabled{background-color:var(--border);color:var(--text-muted);cursor:not-allowed}#confetti-canvas{pointer-events:none;z-index:9999;width:100%;height:100%;display:none;position:fixed;top:0;left:0}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeEffect{0%{opacity:0}to{opacity:1}}.fade-in{animation:.35s fadeEffect}@media (width<=768px){header{padding:0 16px}.course-title{max-width:200px}.progress-bar-container{width:80px}.sidebar{height:100%;position:absolute;top:0;left:0;box-shadow:4px 0 10px #0000001a}main{padding:24px 16px}.slide-main-title{font-size:1.6rem}}input[type=checkbox],input[type=radio]{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.login-card{max-width:440px;margin:auto}.form-group{flex-direction:column;gap:6px;margin-bottom:20px;display:flex}.form-label{color:var(--dark);font-size:.9rem;font-weight:600}.form-input{border:1.5px solid var(--border);width:100%;font-family:var(--font-body);color:var(--text);transition:var(--transition);background-color:#fff;border-radius:8px;outline:none;padding:12px 16px;font-size:.95rem}.form-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.form-actions{justify-content:space-between;align-items:center;margin-bottom:24px;font-size:.88rem;display:flex}.remember-me{cursor:pointer;color:var(--text);align-items:center;gap:8px;display:flex}.remember-me input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary);cursor:pointer;clip:auto;position:static}.forgot-link{color:var(--primary);transition:var(--transition);font-weight:500;text-decoration:none}.forgot-link:hover{color:var(--primary-hover);text-decoration:underline}.submit-btn{justify-content:center;width:100%;padding:12px 24px}