.breadcrumbs{background:#fff;border-bottom:1px solid var(--gray-200);padding:var(--spacing-3) var(--spacing-6)}.breadcrumb-list{align-items:center;display:flex;flex-wrap:wrap;gap:var(--spacing-1);list-style:none;margin:0 auto;max-width:1200px;padding:0}.breadcrumb-item{align-items:center;display:flex;font-size:var(--font-size-sm)}.breadcrumb-separator{color:var(--gray-400);font-weight:500;margin:0 var(--spacing-2)}.breadcrumb-link{color:var(--primary-600);text-decoration:none;transition:color var(--transition-fast)}.breadcrumb-link:hover{color:var(--primary-700);text-decoration:underline}.breadcrumb-current{color:var(--gray-600);font-weight:500}@media (max-width:768px){.breadcrumbs{padding:var(--spacing-2) var(--spacing-4)}.breadcrumb-item{font-size:var(--font-size-xs)}}.layout{display:flex;flex-direction:column;min-height:100vh}.navbar{background:#fff;border-bottom:1px solid var(--gray-200);box-shadow:var(--shadow-sm);position:-webkit-sticky;position:sticky;top:0;z-index:100}.navbar-container{align-items:center;display:flex;height:64px;justify-content:space-between;margin:0 auto;max-width:1400px;padding:0 var(--spacing-4)}.navbar-brand{align-items:center;color:var(--gray-900);display:flex;font-size:var(--font-size-lg);font-weight:700;gap:var(--spacing-2);text-decoration:none}.brand-icon{font-size:1.5rem}.brand-text{color:var(--primary-600)}.navbar-menu{display:flex;gap:var(--spacing-1)}.nav-link{border-radius:var(--radius-md);color:var(--gray-600);font-size:var(--font-size-sm);font-weight:500;padding:var(--spacing-2) var(--spacing-3);text-decoration:none;transition:all var(--transition-fast)}.nav-link:hover{background:var(--primary-50);color:var(--primary-600)}.nav-link.active{background:var(--primary-100);color:var(--primary-700)}.navbar-right{align-items:center;display:flex;gap:var(--spacing-4)}.user-stats{display:flex;font-size:var(--font-size-sm);font-weight:500;gap:var(--spacing-3)}.points,.streak{color:var(--gray-700);gap:var(--spacing-1)}.points,.streak,.user-menu{align-items:center;display:flex}.user-menu{gap:var(--spacing-3)}.user-avatar{align-items:center;background:var(--primary-500);border-radius:50%;color:#fff;display:flex;font-size:var(--font-size-sm);font-weight:600;height:36px;justify-content:center;text-decoration:none;transition:background var(--transition-fast);width:36px}.user-avatar:hover{background:var(--primary-600)}.btn-settings{align-items:center;background:var(--gray-100);border:1px solid var(--gray-200);border-radius:50%;color:var(--gray-600);display:flex;font-size:1.1rem;height:36px;justify-content:center;text-decoration:none;transition:all var(--transition-fast);width:36px}.btn-settings:hover{background:var(--gray-200);color:var(--gray-800)}.btn-logout{background:#fff;border:1px solid var(--gray-300);border-radius:var(--radius-md);color:var(--gray-700);cursor:pointer;font-size:var(--font-size-sm);font-weight:500;padding:var(--spacing-2) var(--spacing-3);transition:all var(--transition-fast)}.btn-logout:hover{background:var(--gray-50);border-color:var(--gray-400);color:var(--gray-900)}.main-content{background:var(--gray-50);flex:1 1}@media (max-width:1024px){.navbar-menu{display:none}}@media (max-width:640px){.user-stats{display:none}.navbar-container{padding:0 var(--spacing-3)}}.login-page{align-items:center;background:linear-gradient(135deg,var(--primary-50) 0,var(--secondary-50) 100%);display:flex;justify-content:center;min-height:100vh;padding:var(--spacing-4)}.login-container{background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);max-width:400px;padding:var(--spacing-8);width:100%}.login-header{margin-bottom:var(--spacing-6);text-align:center}.login-header h1{color:var(--gray-900);font-size:var(--font-size-2xl);margin-bottom:var(--spacing-2)}.login-header p{color:var(--gray-600);margin-bottom:0}.error-message{background-color:var(--error-50)}.login-form{margin-bottom:var(--spacing-6)}.form-group{margin-bottom:var(--spacing-4)}.form-group label{margin-bottom:var(--spacing-1)}.form-group input{border:1px solid var(--gray-300);border-radius:var(--radius-md);font-size:var(--font-size-base);padding:var(--spacing-3);transition:border-color var(--transition-fast),box-shadow var(--transition-fast);width:100%}.form-group input:disabled{background-color:var(--gray-100);cursor:not-allowed}.form-footer{display:flex;justify-content:flex-end;margin-bottom:var(--spacing-4)}.forgot-link{color:var(--primary-600);font-size:var(--font-size-sm)}.forgot-link:hover{color:var(--primary-700);text-decoration:underline}.login-btn{align-items:center;display:flex;font-size:var(--font-size-base);gap:var(--spacing-2);justify-content:center;padding:var(--spacing-3);width:100%}.login-btn:disabled{cursor:not-allowed;opacity:.7}.login-divider{margin:var(--spacing-6) 0;position:relative;text-align:center}.login-divider:after,.login-divider:before{background-color:var(--gray-200);content:"";height:1px;position:absolute;top:50%;width:calc(50% - 80px)}.login-divider:before{left:0}.login-divider:after{right:0}.login-divider span{background:#fff;color:var(--gray-500);font-size:var(--font-size-sm);padding:0 var(--spacing-3)}.register-link{display:block;padding:var(--spacing-3);text-align:center;width:100%}.success-message{background-color:var(--success-50);padding:var(--spacing-4);text-align:center}.success-message .success-icon{display:block;font-size:2rem;margin-bottom:var(--spacing-2)}.success-message p{font-size:var(--font-size-sm);margin:0 0 var(--spacing-2) 0}.success-message p:last-child{margin-bottom:0}.success-message .dev-note{background-color:var(--warning-50);border-radius:var(--radius-sm);color:var(--warning-700);font-size:var(--font-size-xs);margin-top:var(--spacing-3);padding:var(--spacing-2)}@media (max-width:640px){.login-container{padding:var(--spacing-6)}.login-header h1{font-size:var(--font-size-xl)}}.profile-page{background-color:var(--gray-50);min-height:calc(100vh - 64px);padding:var(--spacing-6)}.profile-error,.profile-loading{align-items:center;display:flex;flex-direction:column;gap:var(--spacing-4);justify-content:center;min-height:400px}.profile-container{margin:0 auto;max-width:800px}.profile-header{align-items:center;background:linear-gradient(135deg,var(--primary-500) 0,var(--primary-700) 100%);border-radius:var(--radius-xl);color:#fff;display:flex;flex-direction:column;margin-bottom:var(--spacing-6);padding:var(--spacing-8);text-align:center}.profile-avatar{align-items:center;background:#fff;border-radius:50%;box-shadow:var(--shadow-lg);color:var(--primary-600);display:flex;font-size:var(--font-size-4xl);font-weight:700;height:100px;justify-content:center;margin-bottom:var(--spacing-4);width:100px}.profile-header h1{color:#fff;margin-bottom:var(--spacing-1)}.profile-email{margin-bottom:var(--spacing-3);opacity:.9}.profile-level{border-radius:var(--radius-full);display:inline-block;font-size:var(--font-size-sm);font-weight:600;letter-spacing:.05em;padding:var(--spacing-1) var(--spacing-3);text-transform:uppercase}.level-beginner{background:var(--success-500)}.level-intermediate{background:var(--warning-500)}.level-advanced{background:var(--error-500)}.profile-section{background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);margin-bottom:var(--spacing-4);padding:var(--spacing-6)}.profile-section h2{border-bottom:1px solid var(--gray-200);color:var(--gray-800);font-size:var(--font-size-lg);margin-bottom:var(--spacing-4);padding-bottom:var(--spacing-2)}.stats-grid{grid-gap:var(--spacing-4);display:grid;gap:var(--spacing-4);grid-template-columns:repeat(4,1fr)}.stat-card{align-items:center;background:var(--gray-50);border-radius:var(--radius-lg);display:flex;flex-direction:column;padding:var(--spacing-4);text-align:center}.stat-icon{font-size:1.5rem;margin-bottom:var(--spacing-2)}.info-list{display:flex;flex-direction:column;gap:var(--spacing-3)}.info-item{background:var(--gray-50)}.activity-summary{grid-gap:var(--spacing-4);display:grid;gap:var(--spacing-4);grid-template-columns:repeat(4,1fr)}.activity-item{align-items:center;background:var(--gray-50);border-radius:var(--radius-lg);display:flex;flex-direction:column;padding:var(--spacing-4);text-align:center}.activity-icon{font-size:1.5rem;margin-bottom:var(--spacing-2)}.activity-count{color:var(--gray-900);font-size:var(--font-size-xl);font-weight:700}.activity-label{color:var(--gray-500);font-size:var(--font-size-xs);margin-top:var(--spacing-1)}.graph-container{margin-bottom:var(--spacing-6)}.graph-container:last-child{margin-bottom:0}.graph-title{color:var(--gray-800);font-size:var(--font-size-base);font-weight:600;margin-bottom:var(--spacing-1)}.graph-subtitle{color:var(--gray-500);font-size:var(--font-size-sm);margin-bottom:var(--spacing-4)}.bar-chart{background:var(--gray-50);border-radius:var(--radius-lg);height:200px;padding:var(--spacing-4);position:relative}.bar-chart,.chart-bars{align-items:flex-end;display:flex;gap:var(--spacing-2)}.chart-bars{flex:1 1;height:100%;justify-content:space-around}.chart-bar-container{align-items:center;display:flex;flex:1 1;flex-direction:column;height:100%;max-width:60px}.chart-bar{align-items:flex-start;background:linear-gradient(180deg,var(--primary-500) 0,var(--primary-600) 100%);border-radius:var(--radius-md) var(--radius-md) 0 0;display:flex;justify-content:center;max-width:40px;min-height:4px;position:relative;transition:height var(--transition-normal),background-color var(--transition-fast);width:100%}.chart-bar:hover{background:linear-gradient(180deg,var(--primary-400) 0,var(--primary-500) 100%)}.chart-bar.time-bar{background:linear-gradient(180deg,var(--secondary-500) 0,var(--secondary-600) 100%)}.chart-bar.time-bar:hover{background:linear-gradient(180deg,var(--secondary-400) 0,var(--secondary-500) 100%)}.bar-value{color:var(--gray-700);font-weight:600;position:absolute;top:-24px}.bar-label,.bar-value{font-size:var(--font-size-xs);white-space:nowrap}.bar-label{color:var(--gray-500);margin-top:var(--spacing-2);text-align:center}.chart-y-axis{color:var(--gray-500);display:flex;flex-direction:column;font-size:var(--font-size-xs);height:100%;justify-content:space-between;min-width:30px;padding-right:var(--spacing-2);text-align:right}.no-graph-data{background:var(--gray-50);border-radius:var(--radius-lg);color:var(--gray-500);font-size:var(--font-size-sm);margin:0;padding:var(--spacing-8);text-align:center}.activity-history{margin-top:var(--spacing-2)}.history-list{flex-direction:column;list-style:none;margin:0;padding:0}.history-item,.history-list{display:flex;gap:var(--spacing-3)}.history-item{align-items:center;background:var(--gray-50);border-radius:var(--radius-lg);padding:var(--spacing-3);transition:background-color var(--transition-fast)}.history-item:hover{background:var(--gray-100)}.history-icon{flex-shrink:0;font-size:1.25rem}.history-details{display:flex;flex:1 1;flex-direction:column;gap:var(--spacing-1)}.history-label{color:var(--gray-800);font-weight:500}.history-date{color:var(--gray-500);font-size:var(--font-size-sm)}.history-points{background:var(--success-50);border-radius:var(--radius-md);color:var(--success-600);font-size:var(--font-size-sm);font-weight:600;padding:var(--spacing-1) var(--spacing-2)}.no-history{background:var(--gray-50);border-radius:var(--radius-lg);color:var(--gray-500);margin:0;padding:var(--spacing-6);text-align:center}.export-content{align-items:center;display:flex;gap:var(--spacing-4);justify-content:space-between}.export-info h3{color:var(--gray-900);font-size:var(--font-size-base);margin-bottom:var(--spacing-1)}.export-info p{color:var(--gray-600);font-size:var(--font-size-sm);margin:0}.export-buttons{display:flex;flex-shrink:0;gap:var(--spacing-2)}.btn-secondary{background-color:var(--gray-100);border-radius:var(--radius-lg);cursor:pointer;font-weight:500;padding:var(--spacing-2) var(--spacing-4);transition:all var(--transition-fast)}.btn-secondary:hover{background-color:var(--gray-200);border-color:var(--gray-400)}.danger-zone{border:1px solid var(--error-500)}.danger-zone h2{border-bottom-color:var(--error-200);color:var(--error-600)}.danger-content{align-items:center;display:flex;gap:var(--spacing-4);justify-content:space-between}.danger-info h3{color:var(--gray-900);font-size:var(--font-size-base);margin-bottom:var(--spacing-1)}.danger-info p{color:var(--gray-600);font-size:var(--font-size-sm);margin:0}.btn-danger{background-color:var(--error-500);border:none;border-radius:var(--radius-lg);color:#fff;cursor:pointer;font-weight:500;padding:var(--spacing-2) var(--spacing-4);transition:background-color var(--transition-fast);white-space:nowrap}.btn-danger:hover{background-color:var(--error-600)}.btn-danger:disabled{background-color:var(--error-300);cursor:not-allowed}.btn-secondary-outline{background:#0000;border:1px solid var(--gray-300);border-radius:var(--radius-lg);color:var(--gray-700);cursor:pointer;font-weight:500;padding:var(--spacing-2) var(--spacing-4);transition:all var(--transition-fast)}.btn-secondary-outline:hover{background:var(--gray-100);border-color:var(--gray-400)}.modal-overlay{background:#00000080;padding:var(--spacing-4)}.modal-content{animation:modalSlideIn .2s ease;background:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);max-width:480px;width:100%}@keyframes modalSlideIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.modal-header{border-bottom:1px solid var(--gray-200);padding:var(--spacing-4) var(--spacing-6)}.modal-header h2{color:var(--error-600);font-size:var(--font-size-lg);margin:0}.modal-close{background:none;border:none;color:var(--gray-500);cursor:pointer;font-size:1.5rem;line-height:1;padding:var(--spacing-1)}.modal-close:hover{color:var(--gray-700)}.modal-body{padding:var(--spacing-6)}.warning-box{background:var(--error-50);border-radius:var(--radius-lg);display:flex;gap:var(--spacing-3);margin-bottom:var(--spacing-4);padding:var(--spacing-4)}.warning-icon{flex-shrink:0;font-size:1.5rem}.warning-box p{color:var(--error-700);font-size:var(--font-size-sm);margin:0}.modal-body .form-group{margin-bottom:var(--spacing-4)}.modal-body .form-group label{color:var(--gray-700);display:block;font-weight:500;margin-bottom:var(--spacing-2)}.modal-body .form-group input{border:1px solid var(--gray-300);border-radius:var(--radius-md);font-size:var(--font-size-base);padding:var(--spacing-3);width:100%}.modal-body .form-group input:focus{border-color:var(--primary-500);box-shadow:0 0 0 3px var(--primary-100);outline:none}.modal-body .error-message{background:var(--error-50);border-radius:var(--radius-md);color:var(--error-700);font-size:var(--font-size-sm);margin-bottom:var(--spacing-4);padding:var(--spacing-3)}.modal-actions{display:flex;gap:var(--spacing-3);justify-content:flex-end}.modal-actions .btn{align-items:center;display:inline-flex;gap:var(--spacing-2)}@media (max-width:768px){.profile-page{padding:var(--spacing-4)}.activity-summary,.stats-grid{grid-template-columns:repeat(2,1fr)}.danger-content{flex-direction:column;text-align:center}.danger-info{margin-bottom:var(--spacing-3)}.btn-danger{width:100%}}@media (max-width:480px){.profile-header{padding:var(--spacing-6)}.profile-avatar{font-size:var(--font-size-3xl);height:80px;width:80px}.modal-actions{flex-direction:column-reverse}.modal-actions .btn{width:100%}}.onboarding-page{align-items:center;background:linear-gradient(135deg,#f5f7fa,#e4e9f2);display:flex;justify-content:center;min-height:calc(100vh - 70px);padding:2rem}.onboarding-container{background:#fff;border-radius:16px;box-shadow:0 10px 40px #0000001a;max-width:600px;padding:2.5rem;width:100%}.onboarding-header{margin-bottom:2rem;text-align:center}.onboarding-header h1{color:#1a1a2e;font-size:1.75rem;margin-bottom:.5rem}.onboarding-header p{color:#666;font-size:1rem}.progress-bar{background:#e0e0e0;border-radius:3px;height:6px;overflow:hidden}.progress-fill{background:linear-gradient(90deg,#2563eb,#3b82f6);border-radius:3px;transition:width .3s ease}.step-indicator{color:#666;font-size:.875rem;margin-bottom:1.5rem;text-align:center}.onboarding-step h2{color:#1a1a2e;font-size:1.5rem;margin-bottom:.5rem;text-align:center}.step-description{color:#666;text-align:center}.form-group,.step-description{margin-bottom:1.5rem}.name-input{border:2px solid #e0e0e0;border-radius:8px;font-size:1.125rem;padding:1rem;text-align:center;transition:border-color .2s ease;width:100%}.name-input:focus{border-color:#3b82f6;outline:none}.options-grid{grid-gap:1rem;display:grid;gap:1rem}.options-grid.goals,.options-grid.levels{grid-template-columns:1fr}.options-grid.interests{grid-template-columns:repeat(2,1fr)}.option-card{background:#fff;border:2px solid #e0e0e0;border-radius:12px;cursor:pointer;padding:1rem;text-align:left;transition:all .2s ease}.option-card:hover{background:#f8fafc;border-color:#3b82f6}.option-card.selected{background:#eff6ff;border-color:#3b82f6}.option-card.interest{align-items:center;display:flex;gap:.75rem;padding:1rem}.interest-label{color:#1a1a2e}.option-label{margin-bottom:.25rem}.onboarding-actions{display:flex;gap:1rem;justify-content:center;margin-top:2rem}.onboarding-actions .btn{border-radius:8px;cursor:pointer;font-size:1rem;font-weight:600;padding:.875rem 2rem;transition:all .2s ease}.onboarding-actions .btn-primary{background:linear-gradient(90deg,#2563eb,#3b82f6);border:none;color:#fff}.onboarding-actions .btn-primary:hover:not(:disabled){background:linear-gradient(90deg,#1d4ed8,#2563eb);transform:translateY(-1px)}.onboarding-actions .btn-secondary{background:#fff;border:2px solid #e0e0e0;color:#666}.onboarding-actions .btn-secondary:hover:not(:disabled){background:#f5f5f5;border-color:#ccc}.onboarding-actions .btn:disabled{cursor:not-allowed;opacity:.6}.error-message{background-color:#fef2f2;border:1px solid #fecaca;border-radius:8px;color:#dc2626;margin-bottom:1rem;padding:.75rem 1rem;text-align:center}@media (max-width:480px){.onboarding-container{padding:1.5rem}.options-grid.interests{grid-template-columns:1fr}.onboarding-actions{flex-direction:column}.onboarding-actions .btn{width:100%}}.modal-overlay{align-items:center;animation:fadeIn .15s ease-out;background-color:#00000080;bottom:0;display:flex;justify-content:center;left:0;padding:1rem;position:fixed;right:0;top:0;z-index:1000}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.modal-container{animation:slideUp .2s ease-out;background:#fff;border-radius:12px;box-shadow:0 20px 60px #0003;display:flex;flex-direction:column;max-height:90vh;overflow:hidden;width:100%}.modal-small{max-width:400px}.modal-medium{max-width:500px}.modal-large{max-width:700px}.modal-header{align-items:center;border-bottom:1px solid #e5e7eb;display:flex;justify-content:space-between;padding:1.25rem 1.5rem}.modal-title{color:#1a1a2e;font-size:1.25rem;font-weight:600;margin:0}.modal-close-btn{align-items:center;background:none;border:none;border-radius:6px;color:#9ca3af;cursor:pointer;display:flex;font-size:1.75rem;height:32px;justify-content:center;line-height:1;padding:0;transition:all .15s ease;width:32px}.modal-close-btn:hover{background-color:#f3f4f6;color:#4b5563}.modal-close-btn:focus{box-shadow:0 0 0 2px #3b82f6;outline:none}.modal-content{overflow-y:auto;padding:1.5rem}@media (max-width:640px){.modal-overlay{align-items:flex-end;padding:.5rem}.modal-container{border-radius:16px 16px 0 0;max-height:85vh;max-width:100%}.modal-header{padding:1rem 1.25rem}.modal-content{padding:1.25rem}}.flashcards-page{background:linear-gradient(135deg,#f5f7fa,#e4e9f2);min-height:calc(100vh - 70px);padding:2rem}.flashcards-container{margin:0 auto;max-width:900px}.flashcards-header{margin-bottom:2rem;text-align:center}.flashcards-header h1{color:#1a1a2e;font-size:2rem;margin-bottom:.5rem}.flashcards-header .subtitle{color:#666;font-size:1.125rem}.flashcards-intro{grid-gap:1.5rem;display:grid;gap:1.5rem;grid-template-columns:1fr 1fr;margin-bottom:2rem}.flashcards-actions{text-align:center}.session-stats{display:flex;gap:1rem}.session-stats .stat{border-radius:8px;font-weight:600;padding:.5rem 1rem}.session-stats .correct{background:#dcfce7;color:#166534}.session-stats .incorrect{background:#fee2e2;color:#991b1b}.flashcard-area{min-height:400px}.flashcard,.flashcard-area{align-items:center;display:flex;justify-content:center}.flashcard{background:#fff;border-radius:16px;box-shadow:0 10px 40px #0000001a;flex-direction:column;max-width:500px;min-height:300px;padding:2rem;text-align:center;width:100%}.flashcard.placeholder{background:#f9fafb;border:2px dashed #d1d5db}.flashcard .coming-soon{color:#9ca3af;font-size:.875rem;margin-top:1rem}.flashcard.correct{border:3px solid #22c55e}.flashcard.incorrect{border:3px solid #ef4444}.card-category{color:#6b7280;font-size:.75rem;letter-spacing:.1em;margin-bottom:.5rem;text-transform:uppercase}.card-word-container{align-items:center;display:flex;gap:.75rem;justify-content:center;margin-bottom:.5rem}.card-word{color:#1a1a2e;font-size:2.5rem;font-weight:700}.pronunciation-btn{align-items:center;background:linear-gradient(135deg,#3b82f6,#2563eb);border:none;border-radius:50%;box-shadow:0 2px 8px #3b82f64d;color:#fff;cursor:pointer;display:flex;font-size:1.5rem;height:48px;justify-content:center;transition:all .2s ease;width:48px}.pronunciation-btn:hover{box-shadow:0 4px 12px #3b82f666;transform:scale(1.1)}.pronunciation-btn:active{transform:scale(.95)}.card-prompt{color:#666;margin-bottom:1.5rem}.card-options{grid-gap:.75rem;display:grid;gap:.75rem;grid-template-columns:1fr 1fr;width:100%}.option-btn{border:2px solid #e5e7eb;border-radius:8px;color:#1a1a2e;font-size:1rem;padding:1rem;transition:all .15s ease}.option-btn:hover:not(:disabled){background:#f8fafc;border-color:#3b82f6}.option-btn.selected{background:#eff6ff;border-color:#3b82f6}.option-btn.correct-answer{background:#dcfce7;border-color:#22c55e}.option-btn.wrong-answer{background:#fee2e2;border-color:#ef4444}.option-btn:disabled{cursor:default}.result-message{border-radius:8px;margin-top:1.5rem;padding:1rem}.result-message.correct{background:#dcfce7;color:#166534}.result-message.incorrect{background:#fee2e2;color:#991b1b}.progress-indicator{margin-bottom:1rem;text-align:center}.result-item.correct{background:#dcfce7}.result-item.incorrect{background:#fee2e2}.result-item.correct 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