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var(--border-color);border-radius:var(--radius-lg);background:var(--bg-primary);box-shadow:var(--shadow-md);transition:var(--transition-normal);cursor:pointer;overflow:hidden}.topic-card:hover{border-color:var(--primary-color);box-shadow:var(--shadow-lg);transform:translateY(-4px)}.topic-card:before{position:absolute;top:0;right:0;left:0;height:4px;background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));transition:var(--transition-normal);transform:scaleX(0);content:""}.topic-card:hover:before{transform:scaleX(1)}.topic-icon{display:flex;align-items:center;justify-content:center;width:64px;height:64px;margin-bottom:var(--space-md);border-radius:var(--radius-md);background:var(--bg-tertiary);font-size:var(--font-size-2xl)}.topic-image{width:100%;height:100%;object-fit:cover;border-radius:var(--radius-md)}.topic-icon-fallback{display:flex;align-items:center;justify-content:center;width:100%;height:100%;border-radius:var(--radius-md);background:var(--bg-tertiary);font-size:var(--font-size-2xl)}.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{display:flex;align-items:center;gap:var(--space-md);margin-bottom:var(--space-md)}.time{display:flex;align-items:center;gap:var(--space-xs);color:var(--text-light);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.status-display{display:flex;justify-content:flex-end}.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{background:#4ade801a;color:var(--success-color)}.status-text.in-progress{background:#fbbf241a;color:var(--warning-color)}.status-text.not-completed{background:#9ca3af1a;color:var(--text-light)}@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{display:block;margin-bottom:var(--space-sm);color:var(--text-primary);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.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{outline:none;border-color:var(--primary-color);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;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-repeat:no-repeat}.form-select:focus{outline:none;border-color:var(--primary-color);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{position:fixed;top:0;right:0;left:0;z-index:1000;width:100%;height:100px;background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);box-shadow:0 2px 20px #0000001a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.nav-container{display:flex;align-items:center;justify-content:center;max-width:1200px;height:100%;margin:0 auto;padding:0 var(--space-xl)}.nav-menu{display:flex;align-items:center;gap:4rem}.nav-link{display:flex;flex-direction:column;align-items:center;gap:.5rem;padding:.75rem 1rem;border-radius:20px;text-decoration:none;color:#fff;font-size:.8rem;font-weight:600;transition:all .3s ease;min-width:80px;height:80px;background:none;border:none;cursor:pointer;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{font-size:1.5rem;line-height:1;color:#fff;transition:all .3s ease}.nav-label{font-size:.8rem;font-weight:600;text-align:center;line-height:1;color:#fff;transition:all .3s ease}.nav-link.profile-btn{background:transparent;border:none}.nav-link.profile-btn:hover{background:#ffffff1a;border:none}.nav-link.logout-btn{background:transparent;border:none;color:#fff}.nav-link.logout-btn:hover{background:#ffffff1a;border:none;transform:none;box-shadow: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{display:flex;align-items:center;justify-content:center;gap:var(--space-sm);margin-top:var(--space-xl)}@media (width <= 768px){.navbar{height:90px;padding:var(--space-sm) 0}.nav-container{flex-direction:column;gap:var(--space-md);padding:var(--space-md)}.nav-menu{gap:2rem}.nav-link{padding:.6rem .7rem;min-width:70px;height:70px}.nav-link .material-icon{font-size:1.3rem}.nav-label{font-size:.7rem}.pagination{flex-wrap:wrap;gap:var(--space-xs)}}@media (width <= 480px){.navbar{height:80px}.nav-container{padding:var(--space-sm)}.nav-menu{gap:1.5rem}.nav-link{padding:.5rem .6rem;min-width:60px;height:60px}.nav-link .material-icon{font-size:1.2rem}.nav-label{font-size:.65rem}}.container{width:100%;margin:0 auto;padding:0 var(--space-md)}.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{position:fixed;right:0;bottom:0;left:0;z-index:1000;width:100%;margin-top:0;padding:var(--space-sm) 0;border-top:none;background:#6c50a6}.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{width:100%;height:8px;border-radius:var(--radius-sm);background:var(--bg-tertiary);overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--success-color),var(--primary-color));transition:width .3s ease}@keyframes fade-in{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes slide-in{0%{transform:translate(-100%)}to{transform:translate(0)}}@keyframes modal-slide-in{0%{transform:scale(.9) translateY(-20px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}.fade-in{animation:fade-in .5s ease-out}.slide-in{animation:slide-in .3s ease-out}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:var(--z-modal-backdrop);display:flex;align-items:center;justify-content:center;padding:var(--space-md);background:#0000007f}.modal-content{max-width:90vw;max-height:90vh;border-radius:var(--radius-lg);background:var(--bg-primary);box-shadow:var(--shadow-xl);overflow:auto;animation:modal-slide-in .3s ease-out;position:relative}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-lg)}.modal-body{padding:var(--space-lg)}.modal-footer{display:flex;justify-content:flex-end;gap:var(--space-md);padding:var(--space-lg);border-top:1px solid var(--border-color)}.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:spin 1s linear infinite}@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{display:flex;align-items:center;gap:var(--space-sm);margin-bottom:var(--space-lg);padding:var(--space-md);border-radius:var(--radius-md)}.message-display.success{border:1px solid var(--success-color);background:#4ade801a;color:var(--success-color)}.message-display.error{border:1px solid var(--error-color);background:#f871711a;color:var(--error-color)}.message-display.warning{border:1px solid var(--warning-color);background:#fbbf241a;color:var(--warning-color)}.message-content{display:flex;align-items:center;gap:var(--space-sm)}.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)}}