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var(--secondary-color));height:4px;transition:var(--transition-normal);content:"";position:absolute;top:0;left:0;right:0;transform:scaleX(0)}.topic-card:hover:before{transform:scaleX(1)}.topic-icon{width:64px;height:64px;margin-bottom:var(--space-md);border-radius:var(--radius-md);background:var(--bg-tertiary);font-size:var(--font-size-2xl);justify-content:center;align-items:center;display:flex}.topic-image{object-fit:cover;border-radius:var(--radius-md);width:100%;height:100%}.topic-icon-fallback{border-radius:var(--radius-md);background:var(--bg-tertiary);width:100%;height:100%;font-size:var(--font-size-2xl);justify-content:center;align-items:center;display:flex}.topic-content h3{margin-bottom:var(--space-sm);color:var(--text-primary);font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold)}.topic-content p{margin-bottom:var(--space-md);color:var(--text-secondary);line-height:var(--line-height-relaxed)}.topic-meta{align-items:center;gap:var(--space-md);margin-bottom:var(--space-md);display:flex}.time{align-items:center;gap:var(--space-xs);color:var(--text-light);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);display:flex}.status-display{justify-content:flex-end;display:flex}.status-text{padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium);text-transform:uppercase;letter-spacing:.5px}.status-text.completed{color:var(--success-color);background:#4ade801a}.status-text.in-progress{color:var(--warning-color);background:#fbbf241a}.status-text.not-completed{color:var(--text-light);background:#9ca3af1a}@media (width<=768px){.card,.topic-card{padding:var(--space-lg)}.topic-icon{width:48px;height:48px;font-size:var(--font-size-xl)}}@media (width<=480px){.card,.topic-card{padding:var(--space-md)}}.form-group{margin-bottom:var(--space-lg)}.form-group:last-child{margin-bottom:0}.form-label{margin-bottom:var(--space-sm);color:var(--text-primary);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);display:block}.form-label.required:after{content:" *";color:var(--error-color)}.form-input{width:100%;padding:var(--space-md);border:1px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-primary);color:var(--text-primary);font-size:var(--font-size-base);line-height:var(--line-height-normal);transition:var(--transition-normal)}.form-input:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 0 3px #667eea1a}.form-input:invalid{border-color:var(--error-color)}.form-input:disabled{background:var(--bg-tertiary);color:var(--text-light);cursor:not-allowed}.form-input::placeholder{color:var(--text-light)}.form-select{width:100%;padding:var(--space-md);padding-right:calc(var(--space-md) + 20px);border:1px solid var(--border-color);border-radius:var(--radius-md);background:var(--bg-primary);background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");background-size:16px 12px;background-position:right var(--space-sm) center;color:var(--text-primary);font-size:var(--font-size-base);transition:var(--transition-normal);cursor:pointer;appearance:none;background-repeat:no-repeat}.form-select:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 0 3px #667eea1a}@media (width<=480px){.form-input,.form-select{padding:var(--space-sm);font-size:var(--font-size-sm)}.form-label{font-size:var(--font-size-xs)}}.navbar *,.navbar :before,.navbar :after{box-sizing:border-box!important}.navbar{z-index:1000;background:linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);width:100%;height:100px;position:fixed;top:0;left:0;right:0;box-shadow:0 2px 20px #0000001a}.nav-container{max-width:1200px;height:100%;padding:0 var(--space-xl);justify-content:center;align-items:center;margin:0 auto;display:flex}.nav-menu{align-items:center;gap:4rem;display:flex}.nav-link{color:#fff;cursor:pointer;background:0 0;border:none;border-radius:20px;flex-direction:column;align-items:center;gap:.5rem;min-width:80px;height:80px;padding:.75rem 1rem;font-size:.8rem;font-weight:600;text-decoration:none;transition:all .3s;display:flex;box-shadow:0 2px 8px #00000026}.nav-link:hover{transform:translateY(-2px);box-shadow:0 4px 15px #0003}.nav-link:hover .material-icon{transform:scale(1.1)}.nav-link.active{transform:translateY(-1px);box-shadow:0 4px 20px #00000026}.nav-link.active:hover{transform:translateY(-2px);box-shadow:0 6px 25px #0003}.nav-link .material-icon{color:#fff;font-size:1.5rem;line-height:1;transition:all .3s}.nav-label{text-align:center;color:#fff;font-size:.8rem;font-weight:600;line-height:1;transition:all .3s}.nav-link.profile-btn{background:0 0;border:none}.nav-link.profile-btn:hover{background:#ffffff1a;border:none}.nav-link.logout-btn{color:#fff;background:0 0;border:none}.nav-link.logout-btn:hover{box-shadow:none;background:#ffffff1a;border:none;transform:none}.nav-link.logout-btn .material-icon,.nav-link.logout-btn .nav-label{color:#fff}.nav-spacer{flex:1;min-width:.5rem}.nav-spacer-left{order:-1}.nav-spacer-right{order:999}.main-content{flex:1;width:100%;min-height:calc(100vh - 160px);margin:0 auto}.pagination{justify-content:center;align-items:center;gap:var(--space-sm);margin-top:var(--space-xl);display:flex}@media (width<=768px){.navbar{height:90px;padding:var(--space-sm) 0}.nav-container{gap:var(--space-md);padding:var(--space-md);flex-direction:column}.nav-menu{gap:2rem}.nav-link{min-width:70px;height:70px;padding:.6rem .7rem}.nav-link .material-icon{font-size:1.3rem}.nav-label{font-size:.7rem}.pagination{gap:var(--space-xs);flex-wrap:wrap}}@media (width<=480px){.navbar{height:80px}.nav-container{padding:var(--space-sm)}.nav-menu{gap:1.5rem}.nav-link{min-width:60px;height:60px;padding:.5rem .6rem}.nav-link .material-icon{font-size:1.2rem}.nav-label{font-size:.65rem}}.container{width:100%;padding:0 var(--space-md);margin:0 auto}.page-header{margin-bottom:var(--space-xl);padding:var(--space-xl) 0;border-bottom:1px solid var(--border-color);background:var(--bg-primary)}.page-footer{margin-top:var(--space-xl);padding:var(--space-xl) 0;border-top:1px solid var(--border-color);background:var(--bg-secondary)}.page-footer.fixed{z-index:1000;width:100%;padding:var(--space-sm) 0;background:#6c50a6;border-top:none;margin-top:0;position:fixed;bottom:0;left:0;right:0}.section-title{margin-bottom:var(--space-md);color:var(--text-primary)}@media (width<=768px){.container{padding:0 var(--space-sm)}.page-header{margin-bottom:var(--space-lg);padding:var(--space-lg) 0}}@media (width<=480px){.container{padding:0 var(--space-xs)}}.progress-bar{border-radius:var(--radius-sm);background:var(--bg-tertiary);width:100%;height:8px;overflow:hidden}.progress-fill{background:linear-gradient(90deg, var(--success-color), var(--primary-color));height:100%;transition:width .3s}@keyframes fade-in{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slide-in{0%{transform:translate(-100%)}to{transform:translate(0)}}@keyframes modal-slide-in{0%{opacity:0;transform:scale(.9)translateY(-20px)}to{opacity:1;transform:scale(1)translateY(0)}}.fade-in{animation:.5s ease-out fade-in}.slide-in{animation:.3s ease-out slide-in}.modal-overlay{z-index:var(--z-modal-backdrop);padding:var(--space-md);background:#00000080;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.modal-content{border-radius:var(--radius-lg);background:var(--bg-primary);max-width:90vw;max-height:90vh;box-shadow:var(--shadow-xl);animation:.3s ease-out modal-slide-in;position:relative;overflow:auto}.modal-header{padding:var(--space-lg);justify-content:space-between;align-items:center;display:flex}.modal-body{padding:var(--space-lg)}.modal-footer{justify-content:flex-end;gap:var(--space-md);padding:var(--space-lg);border-top:1px solid var(--border-color);display:flex}.loading-spinner{width:40px;height:40px;margin:0 auto var(--space-md);border:4px solid var(--bg-tertiary);border-top:4px solid var(--primary-color);border-radius:50%;animation:1s linear infinite spin}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.error-card{padding:var(--space-lg);border:1px solid var(--error-color);border-radius:var(--radius-md);background:var(--bg-primary);text-align:center;box-shadow:var(--shadow-sm)}.error-card h3{margin-bottom:var(--space-md);color:var(--error-color)}.message-display{align-items:center;gap:var(--space-sm);margin-bottom:var(--space-lg);padding:var(--space-md);border-radius:var(--radius-md);display:flex}.message-display.success{border:1px solid var(--success-color);color:var(--success-color);background:#4ade801a}.message-display.error{border:1px solid var(--error-color);color:var(--error-color);background:#f871711a}.message-display.warning{border:1px solid var(--warning-color);color:var(--warning-color);background:#fbbf241a}.message-content{align-items:center;gap:var(--space-sm);display:flex}.message-icon{font-size:var(--font-size-lg)}.message-title{font-weight:var(--font-weight-semibold)}.message-text{font-size:var(--font-size-sm)}@media (width<=768px){.modal-content{max-width:calc(100vw - 2rem);max-height:calc(100vh - 2rem);margin:var(--space-md)}.modal-header,.modal-body,.modal-footer{padding:var(--space-md)}}@media (width<=480px){.modal-content{max-width:calc(100vw - 1rem);max-height:calc(100vh - 1rem);margin:var(--space-sm)}.modal-header,.modal-body,.modal-footer{padding:var(--space-sm)}}