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1.5;--line-height-relaxed: 1.75;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--spacing-3xl: 4rem;--spacing-4xl: 6rem;--border-radius-sm: .25rem;--border-radius-md: .5rem;--border-radius-lg: .75rem;--border-radius-xl: 1rem;--border-radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--transition-fast: .15s ease-in-out;--transition-normal: .25s ease-in-out;--transition-slow: .35s ease-in-out;--breakpoint-sm: 640px;--breakpoint-md: 768px;--breakpoint-lg: 1024px;--breakpoint-xl: 1280px;--breakpoint-2xl: 1536px;--z-dropdown: 1000;--z-sticky: 1020;--z-fixed: 1030;--z-modal-backdrop: 1040;--z-modal: 1050;--z-popover: 1060;--z-tooltip: 1070}@media(prefers-color-scheme:dark){:root{--color-background: #0f172a;--color-surface: #1e293b;--color-text-primary: #f1f5f9;--color-text-secondary: #cbd5e1;--color-text-light: #64748b;--color-border: 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0}h1{font-size:var(--font-size-4xl)}h2{font-size:var(--font-size-3xl)}h3{font-size:var(--font-size-2xl)}}.fade-in{animation:fadeIn .6s ease-in-out}.slide-up{animation:slideUp .6s ease-out}*,*:before,*:after{box-sizing:border-box}html{line-height:1.15;-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg-primary);color:var(--text-primary);line-height:var(--line-height-normal)}h1,h2,h3,h4,h5,h6{margin:0;font-weight:var(--font-weight-bold);line-height:var(--line-height-tight)}p{margin:0}a{color:var(--primary-color);text-decoration:none;transition:color 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var(--transition-fast);position:relative;text-decoration:none;display:inline-block}.nav-link:hover{color:var(--color-primary);background-color:var(--color-surface)}.nav-link.active{color:var(--color-primary);font-weight:var(--font-weight-semibold)}.nav-link.active:after{content:"";position:absolute;bottom:-2px;left:50%;transform:translate(-50%);width:20px;height:2px;background-color:var(--color-primary);border-radius:var(--border-radius-full)}.mobile-menu-toggle{display:none;background:none;border:none;font-size:var(--font-size-lg);color:var(--color-text-primary);cursor:pointer;padding:var(--spacing-sm);border-radius:var(--border-radius-md);transition:all var(--transition-fast)}.mobile-menu-toggle:hover{background-color:var(--color-surface)}@media(max-width:768px){.mobile-menu-toggle{display:block}.nav{position:absolute;top:100%;left:0;right:0;background:var(--color-background);border-top:1px solid 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var(--color-surface)}.about-profile-img:hover{transform:translateY(-5px)}.about-bio{font-size:var(--font-size-lg);line-height:var(--line-height-relaxed);color:var(--color-text-secondary);margin-bottom:var(--spacing-xl)}.about-details{display:flex;flex-direction:column;gap:var(--spacing-md)}.detail-item{display:flex;gap:var(--spacing-sm)}.detail-label{font-weight:var(--font-weight-semibold);color:var(--color-text-primary);min-width:80px}.detail-value{color:var(--color-text-secondary)}@media(max-width:768px){.about-content{grid-template-columns:1fr;gap:var(--spacing-3xl);text-align:center}.about-profile-img{width:250px;height:250px}.section-title{font-size:var(--font-size-3xl)}.about-bio{font-size:var(--font-size-base)}.about-details{align-items:center}.detail-item{justify-content:center}}.contact{background:var(--color-background)}.contact-content{max-width:800px;margin:0 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a:hover{color:var(--color-primary-dark)}.social-links-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg)}.social-link-card{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-lg);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--border-radius-lg);text-decoration:none;color:var(--color-text-secondary);transition:all var(--transition-fast);justify-content:center}.social-link-card:hover{background:var(--color-primary);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-md)}.social-icon{font-size:var(--font-size-xl)}.social-link-card span{font-weight:var(--font-weight-semibold)}@media(max-width:768px){.section-title{font-size:var(--font-size-3xl)}.contact-description{font-size:var(--font-size-base)}.contact-item{flex-direction:column;text-align:center;gap:var(--spacing-md)}.social-links-grid{grid-template-columns:1fr}}.projects-page{min-height:100vh;padding-top:100px;padding-bottom:var(--spacing-4xl);background:var(--color-background)}.projects-header{text-align:center;margin-bottom:var(--spacing-4xl)}.page-title{font-size:var(--font-size-5xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-lg)}.page-description{font-size:var(--font-size-lg);color:var(--color-text-secondary);max-width:600px;margin:0 auto;line-height:var(--line-height-relaxed)}.projects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:var(--spacing-2xl);margin-top:var(--spacing-4xl)}.project-card{background:var(--color-surface);border-radius:var(--border-radius-xl);overflow:hidden;box-shadow:var(--shadow-md);transition:all var(--transition-normal);border:1px solid var(--color-border)}.project-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-xl)}.project-image{position:relative;height:200px;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));display:flex;align-items:center;justify-content:center}.image-placeholder{width:80px;height:80px;background:#fff3;border-radius:var(--border-radius-full);display:flex;align-items:center;justify-content:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.project-icon{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:#fff}.featured-badge{position:absolute;top:var(--spacing-md);right:var(--spacing-md);background:var(--color-accent);color:#fff;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold)}.project-content{padding:var(--spacing-xl)}.project-title{font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-md)}.project-description{color:var(--color-text-secondary);line-height:var(--line-height-relaxed);margin-bottom:var(--spacing-lg)}.project-technologies{display:flex;flex-wrap:wrap;gap:var(--spacing-sm);margin-bottom:var(--spacing-xl)}.tech-tag{background:var(--color-background);color:var(--color-primary);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);border:1px solid var(--color-border)}.project-links{display:flex;gap:var(--spacing-md);flex-wrap:wrap}.project-link{display:inline-flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--border-radius-md);text-decoration:none;font-weight:var(--font-weight-medium);font-size:var(--font-size-sm);transition:all var(--transition-fast);border:1px solid transparent}.project-link.primary{background:var(--color-primary);color:#fff}.project-link.primary:hover{background:var(--color-primary-dark);transform:translateY(-1px)}.project-link.secondary{background:var(--color-background);color:var(--color-text-secondary);border-color:var(--color-border)}.project-link.secondary:hover{background:var(--color-text-secondary);color:#fff;transform:translateY(-1px)}@media(max-width:768px){.projects-page{padding-top:80px}.page-title{font-size:var(--font-size-4xl)}.page-description{font-size:var(--font-size-base)}.projects-grid{grid-template-columns:1fr;gap:var(--spacing-xl)}.project-card{margin:0 var(--spacing-md)}.project-links{justify-content:center}}.tic-tac-toe-page{min-height:100vh;padding-top:100px;padding-bottom:var(--spacing-4xl);background:linear-gradient(135deg,var(--color-background) 0%,var(--color-surface) 100%)}.game-container{max-width:500px;margin:0 auto;background:var(--color-background);border-radius:var(--border-radius-xl);padding:var(--spacing-2xl);box-shadow:var(--shadow-lg);border:1px solid var(--color-border)}.scoreboard{display:grid;grid-template-columns:1fr 1fr 1fr;gap:var(--spacing-md);margin-bottom:var(--spacing-xl)}.score-item{text-align:center;padding:var(--spacing-md);background:var(--color-surface);border-radius:var(--border-radius-lg);border:1px solid var(--color-border)}.score-label{display:block;font-size:var(--font-size-sm);color:var(--color-text-secondary);margin-bottom:var(--spacing-xs)}.score-value{display:block;font-size:var(--font-size-2xl);font-weight:var(--font-weight-bold);color:var(--color-primary)}.game-status{text-align:center;margin-bottom:var(--spacing-xl);font-size:var(--font-size-lg);color:var(--color-text-primary);min-height:60px;display:flex;align-items:center;justify-content:center}.winner-announcement{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--color-accent);font-weight:var(--font-weight-bold)}.trophy-icon{font-size:var(--font-size-xl);color:var(--color-accent);animation:bounce 1s infinite}.game-board{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--spacing-sm);margin-bottom:var(--spacing-xl);aspect-ratio:1}.game-cell{background:var(--color-surface);border:2px solid var(--color-border);border-radius:var(--border-radius-lg);cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;justify-content:center;font-size:var(--font-size-4xl);font-weight:var(--font-weight-bold);position:relative;overflow:hidden}.game-cell:hover:not(:disabled){background:var(--color-primary);border-color:var(--color-primary);transform:scale(1.02)}.game-cell:hover:not(:disabled) .cell-content{color:#fff}.game-cell:disabled{cursor:not-allowed}.game-cell.filled{background:var(--color-background)}.game-cell.winning-cell{background:var(--color-accent);border-color:var(--color-accent);animation:pulse 1s infinite}.game-cell.winning-cell .cell-content{color:#fff}.cell-content{transition:all var(--transition-fast);animation:fadeIn .3s ease-in-out}.cell-content.player-x{color:var(--color-primary)}.cell-content.player-o{color:var(--color-accent)}.game-controls{display:flex;gap:var(--spacing-md);justify-content:center}.control-button{display:inline-flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);border:none;border-radius:var(--border-radius-lg);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all var(--transition-fast);font-size:var(--font-size-base)}.control-button.primary{background:var(--color-primary);color:#fff}.control-button.primary:hover{background:var(--color-primary-dark);transform:translateY(-1px)}.control-button.secondary{background:var(--color-surface);color:var(--color-text-secondary);border:1px solid var(--color-border)}.control-button.secondary:hover{background:var(--color-text-secondary);color:#fff;transform:translateY(-1px)}@keyframes fadeIn{0%{opacity:0;transform:scale(.8)}to{opacity:1;transform:scale(1)}}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes bounce{0%,20%,50%,80%,to{transform:translateY(0)}40%{transform:translateY(-10px)}60%{transform:translateY(-5px)}}@media(max-width:768px){.tic-tac-toe-page{padding-top:80px}.game-title{font-size:var(--font-size-4xl)}.game-container{margin:0 var(--spacing-md);padding:var(--spacing-xl)}.game-board{gap:var(--spacing-xs)}.game-cell{font-size:var(--font-size-3xl)}.control-button{padding:var(--spacing-sm) var(--spacing-md);font-size:var(--font-size-sm)}.scoreboard{gap:var(--spacing-sm)}.score-item{padding:var(--spacing-sm)}.score-value{font-size:var(--font-size-xl)}}.study-page{min-height:100vh;padding-top:100px;padding-bottom:var(--spacing-4xl);background:linear-gradient(135deg,var(--color-background) 0%,var(--color-surface) 100%)}.study-header{text-align:center;margin-bottom:var(--spacing-4xl)}.page-title{font-size:var(--font-size-5xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-md)}.page-description{font-size:var(--font-size-lg);color:var(--color-text-secondary);margin-bottom:var(--spacing-2xl)}.progress-overview{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-lg);margin-bottom:var(--spacing-4xl)}.progress-card{background:var(--color-background);border-radius:var(--border-radius-xl);padding:var(--spacing-xl);box-shadow:var(--shadow-md);border:1px solid var(--color-border);display:flex;align-items:center;gap:var(--spacing-lg);transition:all var(--transition-fast)}.progress-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.progress-icon{width:60px;height:60px;border-radius:var(--border-radius-full);background:linear-gradient(135deg,var(--color-primary),var(--color-accent));display:flex;align-items:center;justify-content:center;color:#fff;font-size:var(--font-size-xl);flex-shrink:0}.progress-info h3{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.progress-bar{width:100%;height:8px;background:var(--color-border);border-radius:var(--border-radius-full);overflow:hidden;margin-bottom:var(--spacing-sm)}.progress-fill{height:100%;background:linear-gradient(90deg,var(--color-primary),var(--color-accent));border-radius:var(--border-radius-full);transition:width var(--transition-normal)}.progress-info span{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.streak-number{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:var(--color-primary);line-height:1;margin-bottom:var(--spacing-xs)}.roadmaps-section{margin-bottom:var(--spacing-4xl)}.roadmaps-section h2{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-xl)}.roadmaps-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:var(--spacing-xl)}.roadmap-card{background:var(--color-background);border-radius:var(--border-radius-xl);padding:var(--spacing-xl);box-shadow:var(--shadow-md);border:1px solid var(--color-border);transition:all var(--transition-fast)}.roadmap-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.roadmap-header{display:flex;align-items:flex-start;gap:var(--spacing-md);margin-bottom:var(--spacing-lg)}.roadmap-color{width:4px;height:60px;border-radius:var(--border-radius-full);flex-shrink:0}.roadmap-info h3{font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.roadmap-info p{color:var(--color-text-secondary);line-height:var(--line-height-relaxed)}.roadmap-stats{display:flex;justify-content:space-between;margin-bottom:var(--spacing-lg)}.stat{text-align:center}.stat-value{display:block;font-size:var(--font-size-lg);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-xs)}.stat-label{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.difficulty-badge{color:#fff!important;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-xs)!important;text-transform:capitalize}.roadmap-progress{display:flex;align-items:center;gap:var(--spacing-md)}.roadmap-progress span{font-size:var(--font-size-sm);color:var(--color-text-secondary);white-space:nowrap}.controls-section{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-3xl);flex-wrap:wrap;gap:var(--spacing-lg)}.filter-group{display:flex;align-items:center;gap:var(--spacing-sm)}.filter-group label{font-weight:var(--font-weight-semibold);color:var(--color-text-primary)}.filter-group select{padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--color-border);border-radius:var(--border-radius-md);background:var(--color-background);color:var(--color-text-primary);font-size:var(--font-size-base);min-width:150px}.add-task-button{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-md) var(--spacing-lg);background:var(--color-primary);color:#fff;border:none;border-radius:var(--border-radius-lg);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all var(--transition-fast)}.add-task-button:hover{background:var(--color-primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:var(--z-modal);padding:var(--spacing-lg)}.add-task-modal{background:var(--color-background);border-radius:var(--border-radius-xl);box-shadow:var(--shadow-xl);width:100%;max-width:600px;max-height:90vh;overflow-y:auto}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-xl);border-bottom:1px solid var(--color-border)}.modal-header h3{margin:0;font-size:var(--font-size-xl);color:var(--color-text-primary)}.close-button{background:none;border:none;font-size:var(--font-size-lg);color:var(--color-text-secondary);cursor:pointer;padding:var(--spacing-sm);border-radius:var(--border-radius-md);transition:all var(--transition-fast)}.close-button:hover{background:var(--color-surface);color:var(--color-text-primary)}.modal-content{padding:var(--spacing-xl)}.form-group{margin-bottom:var(--spacing-lg)}.form-group label{display:block;font-weight:var(--font-weight-semibold);color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.form-group input,.form-group textarea,.form-group select{width:100%;padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--color-border);border-radius:var(--border-radius-md);background:var(--color-background);color:var(--color-text-primary);font-size:var(--font-size-base);transition:border-color var(--transition-fast)}.form-group input:focus,.form-group textarea:focus,.form-group select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px #2563eb1a}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-lg)}.labels-input{display:flex;gap:var(--spacing-sm);margin-bottom:var(--spacing-md)}.labels-input input{flex:1}.labels-input button{padding:var(--spacing-sm) var(--spacing-md);background:var(--color-primary);color:#fff;border:none;border-radius:var(--border-radius-md);cursor:pointer;transition:all var(--transition-fast)}.labels-input button:hover:not(:disabled){background:var(--color-primary-dark)}.labels-input button:disabled{background:var(--color-border);cursor:not-allowed}.existing-labels{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-md);flex-wrap:wrap}.existing-labels span{font-size:var(--font-size-sm);color:var(--color-text-secondary)}.label-quick-add{padding:var(--spacing-xs) var(--spacing-sm);background:var(--color-surface);color:var(--color-text-secondary);border:1px solid var(--color-border);border-radius:var(--border-radius-full);font-size:var(--font-size-sm);cursor:pointer;transition:all var(--transition-fast)}.label-quick-add:hover:not(:disabled){background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.label-quick-add:disabled{opacity:.5;cursor:not-allowed}.selected-labels{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.selected-label{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-xs) var(--spacing-sm);background:var(--color-primary);color:#fff;border-radius:var(--border-radius-full);font-size:var(--font-size-sm)}.selected-label button{background:none;border:none;color:#fff;cursor:pointer;padding:2px;border-radius:var(--border-radius-full);transition:all var(--transition-fast)}.selected-label button:hover{background:#fff3}.modal-actions{display:flex;justify-content:flex-end;gap:var(--spacing-md);padding:var(--spacing-xl);border-top:1px solid var(--color-border)}.cancel-button{padding:var(--spacing-sm) var(--spacing-lg);background:var(--color-surface);color:var(--color-text-secondary);border:1px solid var(--color-border);border-radius:var(--border-radius-md);cursor:pointer;transition:all var(--transition-fast)}.cancel-button:hover{background:var(--color-text-secondary);color:#fff}.add-button{padding:var(--spacing-sm) var(--spacing-lg);background:var(--color-primary);color:#fff;border:none;border-radius:var(--border-radius-md);cursor:pointer;transition:all var(--transition-fast)}.add-button:hover:not(:disabled){background:var(--color-primary-dark)}.add-button:disabled{background:var(--color-border);cursor:not-allowed}.tasks-section h2{font-size:var(--font-size-3xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-xl)}.tasks-list{display:flex;flex-direction:column;gap:var(--spacing-lg)}.task-card{background:var(--color-background);border-radius:var(--border-radius-xl);border:1px solid var(--color-border);box-shadow:var(--shadow-sm);transition:all var(--transition-fast);overflow:hidden}.task-card:hover{box-shadow:var(--shadow-md)}.task-card.completed{opacity:.8;background:var(--color-surface)}.task-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-xl)}.task-main{display:flex;align-items:flex-start;gap:var(--spacing-md);flex:1}.task-checkbox{width:24px;height:24px;border:2px solid var(--color-border);border-radius:var(--border-radius-md);background:var(--color-background);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);flex-shrink:0;margin-top:2px}.task-checkbox:hover{border-color:var(--color-primary)}.task-checkbox.checked{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.task-info h3{font-size:var(--font-size-lg);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);margin-bottom:var(--spacing-sm)}.task-info p{color:var(--color-text-secondary);line-height:var(--line-height-relaxed);margin-bottom:var(--spacing-md)}.task-meta{display:flex;align-items:center;gap:var(--spacing-md);flex-wrap:wrap}.task-labels{display:flex;flex-wrap:wrap;gap:var(--spacing-xs)}.task-label{display:flex;align-items:center;gap:var(--spacing-xs);background:var(--color-surface);color:var(--color-primary);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-medium)}.task-category{background:var(--color-surface);color:var(--color-primary);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium)}.task-difficulty{color:#fff;padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);text-transform:capitalize}.task-time{display:flex;align-items:center;gap:var(--spacing-xs);color:var(--color-text-secondary);font-size:var(--font-size-sm)}.task-actions{display:flex;align-items:center;gap:var(--spacing-md)}.task-progress-circle{width:50px;height:50px;border-radius:var(--border-radius-full);background:conic-gradient(var(--color-primary) 0deg,var(--color-border) 0deg);display:flex;align-items:center;justify-content:center;font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);position:relative}.task-progress-circle:before{content:"";position:absolute;width:36px;height:36px;background:var(--color-background);border-radius:var(--border-radius-full);z-index:1}.task-progress-circle span{position:relative;z-index:2}.expand-button{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--border-radius-md);padding:var(--spacing-sm);cursor:pointer;color:var(--color-text-secondary);transition:all var(--transition-fast)}.expand-button:hover{background:var(--color-primary);color:#fff}.task-details{padding:0 var(--spacing-xl) var(--spacing-xl);border-top:1px solid var(--color-border);background:var(--color-surface)}.task-details h4{font-size:var(--font-size-base);font-weight:var(--font-weight-semibold);color:var(--color-text-primary);margin:var(--spacing-lg) 0 var(--spacing-md) 0}.prerequisite-tags{display:flex;flex-wrap:wrap;gap:var(--spacing-sm)}.prerequisite-tag{background:var(--color-background);color:var(--color-text-secondary);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);font-size:var(--font-size-sm);border:1px solid var(--color-border)}.prerequisite-tag.completed{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.subtasks-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.subtask{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm);border-radius:var(--border-radius-md);transition:all var(--transition-fast)}.subtask:hover{background:var(--color-background)}.subtask-checkbox{width:18px;height:18px;border:2px solid var(--color-border);border-radius:var(--border-radius-sm);background:var(--color-background);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast);flex-shrink:0}.subtask-checkbox:hover{border-color:var(--color-primary)}.subtask-checkbox.checked{background:var(--color-primary);border-color:var(--color-primary);color:#fff}.subtask span{color:var(--color-text-primary);font-size:var(--font-size-sm)}.subtask span.completed{text-decoration:line-through;color:var(--color-text-secondary)}.resources-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.resource-link{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background:var(--color-background);border:1px solid var(--color-border);border-radius:var(--border-radius-md);text-decoration:none;color:var(--color-text-primary);transition:all var(--transition-fast)}.resource-link:hover{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.resource-type{margin-left:auto;font-size:var(--font-size-xs);color:var(--color-text-secondary);background:var(--color-surface);padding:var(--spacing-xs) var(--spacing-sm);border-radius:var(--border-radius-full);text-transform:capitalize}.resource-link:hover .resource-type{background:#fff3;color:#fff}@media(max-width:768px){.study-page{padding-top:80px}.page-title{font-size:var(--font-size-4xl)}.progress-overview,.roadmaps-grid{grid-template-columns:1fr}.controls-section{flex-direction:column;align-items:stretch}.task-header{flex-direction:column;align-items:flex-start;gap:var(--spacing-md)}.task-actions{align-self:flex-end}.task-meta{flex-direction:column;align-items:flex-start;gap:var(--spacing-sm)}.task-labels{width:100%}.modal-overlay{padding:var(--spacing-md)}.add-task-modal{max-height:95vh}.form-row{grid-template-columns:1fr}.existing-labels{flex-direction:column;align-items:flex-start}.modal-actions{flex-direction:column}.modal-actions button{width:100%}}.sudoku-page{min-height:100vh;padding-top:100px;padding-bottom:var(--spacing-4xl);background:linear-gradient(135deg,var(--color-background) 0%,var(--color-surface) 100%)}.game-description{font-size:var(--font-size-lg);color:var(--color-text-secondary);margin-bottom:var(--spacing-2xl);max-width:600px;margin-left:auto;margin-right:auto}.game-container{max-width:600px;margin:0 auto;background:var(--color-background);border-radius:var(--border-radius-xl);padding:var(--spacing-2xl);box-shadow:var(--shadow-lg);border:1px solid var(--color-border)}.difficulty-selector{display:flex;align-items:center;gap:var(--spacing-sm)}.difficulty-selector label{font-weight:var(--font-weight-semibold);color:var(--color-text-primary)}.difficulty-selector select{padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--color-border);border-radius:var(--border-radius-md);background:var(--color-background);color:var(--color-text-primary)}.sudoku-grid{display:grid;grid-template-rows:repeat(9,1fr);gap:2px;background:var(--color-text-primary);border:3px solid var(--color-text-primary);border-radius:var(--border-radius-md);margin-bottom:var(--spacing-xl);aspect-ratio:1}.sudoku-row{display:grid;grid-template-columns:repeat(9,1fr);gap:2px}.sudoku-row:nth-child(3n){margin-bottom:2px}.sudoku-cell{aspect-ratio:1;background:var(--color-background);display:flex;align-items:center;justify-content:center;font-size:var(--font-size-lg);font-weight:var(--font-weight-bold);cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none}.sudoku-cell:nth-child(3n){margin-right:2px}.sudoku-cell:hover:not(.selected):not(.initial){background:#00000008}.sudoku-cell.selected{background:var(--color-primary);color:#fff;box-shadow:0 0 0 2px var(--color-primary)}.sudoku-cell.highlighted{background:#0000000d}.sudoku-cell.highlighted:hover:not(.selected):not(.initial){background:#00000014}.sudoku-cell.initial{background:var(--color-surface);color:var(--color-text-primary);font-weight:var(--font-weight-bold);cursor:default}.sudoku-cell.initial:hover{background:var(--color-surface)}.sudoku-cell.initial.highlighted{background:#00000014}.sudoku-cell.error{background:#ef44441a;color:var(--color-error)}.sudoku-cell.selected.error{background:var(--color-error);color:#fff}.number-pad{display:grid;grid-template-columns:repeat(5,1fr);gap:var(--spacing-sm)}.number-button,.clear-button{aspect-ratio:1;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text-primary);font-size:var(--font-size-lg);font-weight:var(--font-weight-bold);border-radius:var(--border-radius-md);cursor:pointer;transition:all var(--transition-fast)}.number-button:hover:not(:disabled),.clear-button:hover:not(:disabled){background:var(--color-primary);color:#fff;transform:translateY(-1px)}.number-button:disabled,.clear-button:disabled{background:var(--color-border);color:var(--color-text-light);cursor:not-allowed}.clear-button{grid-column:span 2;font-size:var(--font-size-base)}@media(max-width:768px){.sudoku-page{padding-top:80px}.game-title{font-size:var(--font-size-4xl)}.game-container{margin:0 var(--spacing-md);padding:var(--spacing-xl)}.game-controls{flex-direction:column;align-items:stretch;gap:var(--spacing-md)}.game-stats,.action-buttons{justify-content:center}.sudoku-cell{font-size:var(--font-size-base)}.number-pad{grid-template-columns:repeat(3,1fr)}.clear-button{grid-column:span 3}}@media(max-width:480px){.game-container{padding:var(--spacing-lg)}.sudoku-cell{font-size:var(--font-size-sm)}.number-button,.clear-button{font-size:var(--font-size-base)}}.crossword-page{min-height:100vh;padding-top:100px;padding-bottom:var(--spacing-4xl);background:linear-gradient(135deg,var(--color-background) 0%,var(--color-surface) 100%)}.game-header{text-align:center;margin-bottom:var(--spacing-4xl)}.back-link{display:inline-flex;align-items:center;gap:var(--spacing-sm);color:var(--color-primary);text-decoration:none;font-weight:var(--font-weight-medium);margin-bottom:var(--spacing-xl);padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--border-radius-md);transition:all var(--transition-fast)}.back-link:hover{background:var(--color-surface);transform:translate(-2px)}.game-title{font-size:var(--font-size-5xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-md)}.game-description{font-size:var(--font-size-lg);color:var(--color-text-secondary);margin-bottom:var(--spacing-2xl)}.crossword-container{max-width:1200px;margin:0 auto;background:var(--color-background);border-radius:var(--border-radius-xl);padding:var(--spacing-2xl);box-shadow:var(--shadow-lg);border:1px solid var(--color-border)}.game-controls{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl);flex-wrap:wrap;gap:var(--spacing-md)}.game-stats{display:flex;gap:var(--spacing-lg)}.stat{display:flex;align-items:center;gap:var(--spacing-sm);color:var(--color-text-secondary);font-weight:var(--font-weight-medium)}.action-buttons{display:flex;gap:var(--spacing-sm)}.hint-button,.new-game-button{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);border:none;border-radius:var(--border-radius-md);font-weight:var(--font-weight-semibold);cursor:pointer;transition:all var(--transition-fast)}.hint-button{background:var(--color-accent);color:#fff}.hint-button:hover:not(:disabled){background:#d97706;transform:translateY(-1px)}.hint-button:disabled{background:var(--color-border);color:var(--color-text-light);cursor:not-allowed}.new-game-button{background:var(--color-primary);color:#fff}.new-game-button:hover{background:var(--color-primary-dark);transform:translateY(-1px)}.completion-message{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);background:linear-gradient(135deg,var(--color-primary),var(--color-accent));color:#fff;padding:var(--spacing-md);border-radius:var(--border-radius-lg);margin-bottom:var(--spacing-xl);font-weight:var(--font-weight-semibold);animation:celebration .6s ease-out}@keyframes celebration{0%{transform:scale(.9);opacity:0}50%{transform:scale(1.05)}to{transform:scale(1);opacity:1}}.crossword-main{display:grid;grid-template-columns:1fr 300px;gap:var(--spacing-2xl)}.crossword-grid{display:grid;grid-template-rows:repeat(15,1fr);gap:1px;background:var(--color-text-primary);border:2px solid var(--color-text-primary);border-radius:var(--border-radius-md);aspect-ratio:1;max-width:600px}.crossword-row{display:grid;grid-template-columns:repeat(15,1fr);gap:1px}.crossword-cell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;position:relative;cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none}.crossword-cell.black{background:var(--color-text-primary);cursor:default}.crossword-cell.white{background:var(--color-background);border:1px solid var(--color-border)}.crossword-cell.white:hover{background:var(--color-surface)}.crossword-cell.selected{background:var(--color-primary);color:#fff}.crossword-cell.highlighted{background:#2563eb1a}.crossword-cell.selected.highlighted{background:var(--color-primary)}.cell-number{position:absolute;top:2px;left:2px;font-size:8px;font-weight:var(--font-weight-bold);color:var(--color-text-secondary);line-height:1}.crossword-cell.selected .cell-number{color:#fff}.cell-letter{font-size:var(--font-size-lg);font-weight:var(--font-weight-bold);color:var(--color-text-primary)}.crossword-cell.selected .cell-letter{color:#fff}.clues-panel{display:flex;flex-direction:column;gap:var(--spacing-xl);max-height:600px;overflow-y:auto}.clues-section h3{font-size:var(--font-size-xl);font-weight:var(--font-weight-bold);color:var(--color-text-primary);margin-bottom:var(--spacing-md);border-bottom:2px solid var(--color-primary);padding-bottom:var(--spacing-sm)}.clues-list{display:flex;flex-direction:column;gap:var(--spacing-sm)}.clue-item{display:flex;gap:var(--spacing-sm);padding:var(--spacing-sm);border-radius:var(--border-radius-md);cursor:pointer;transition:all var(--transition-fast)}.clue-item:hover{background:var(--color-surface)}.clue-item.selected{background:var(--color-primary);color:#fff}.clue-number{font-weight:var(--font-weight-bold);min-width:20px;color:var(--color-primary)}.clue-item.selected .clue-number{color:#fff}.clue-text{flex:1;color:var(--color-text-secondary)}.clue-item.selected .clue-text{color:#fff}@media(max-width:1024px){.crossword-main{grid-template-columns:1fr;gap:var(--spacing-xl)}.clues-panel{max-height:none;display:grid;grid-template-columns:1fr 1fr;gap:var(--spacing-lg)}}@media(max-width:768px){.crossword-page{padding-top:80px}.game-title{font-size:var(--font-size-4xl)}.crossword-container{margin:0 var(--spacing-md);padding:var(--spacing-xl)}.game-controls{flex-direction:column;align-items:stretch;gap:var(--spacing-md)}.game-stats,.action-buttons{justify-content:center}.crossword-grid{max-width:100%}.cell-letter{font-size:var(--font-size-base)}.cell-number{font-size:6px}.clues-panel{grid-template-columns:1fr}}@media(max-width:480px){.crossword-container{padding:var(--spacing-lg)}.cell-letter{font-size:var(--font-size-sm)}.clue-item{padding:var(--spacing-xs)}.clue-text{font-size:var(--font-size-sm)}}.App{min-height:100vh}main{min-height:100vh}section{position:relative}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.loading{display:flex;align-items:center;justify-content:center;min-height:200px;color:var(--text-muted)}.error{display:flex;align-items:center;justify-content:center;min-height:200px;color:var(--error-color);text-align:center}.fade-in{animation:fadeIn .5s ease-in-out}.slide-up{animation:slideUp .5s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media(max-width:768px){.hide-mobile{display:none!important}}@media(min-width:769px){.hide-desktop{display:none!important}}