:root{--bg-primary: #ffffff;--bg-secondary: #f8f9fa;--bg-tertiary: #e9ecef;--text-primary: #212529;--text-secondary: #495057;--text-tertiary: #6c757d;--accent: #0d6efd;--accent-hover: #0b5ed7;--accent-light: #cfe2ff;--border: #dee2e6;--border-light: #e9ecef;--card-shadow: rgba(0, 0, 0, 0.05);--font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--font-size-base: 1rem;--font-size-sm: 0.875rem;--font-size-lg: 1.125rem;--font-size-xl: 1.25rem;--font-size-2xl: 1.5rem;--font-size-3xl: 1.875rem;--font-size-4xl: 2.25rem;--line-height-tight: 1.25;--line-height-base: 1.5;--line-height-relaxed: 1.75;--space-1: 0.25rem;--space-2: 0.5rem;--space-3: 0.75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--radius-sm: 0.125rem;--radius-md: 0.25rem;--radius-lg: 0.5rem;--radius-xl: 1rem;--radius-full: 9999px;--transition-fast: 0.15s ease;--transition-base: 0.3s ease;--transition-slow: 0.5s ease}[data-theme="dark"]{--bg-primary: #121212;--bg-secondary: #1e1e1e;--bg-tertiary: #2d2d2d;--text-primary: #f8f9fa;--text-secondary: #e9ecef;--text-tertiary: #ced4da;--accent: #3b82f6;--accent-hover: #60a5fa;--accent-light: #1e3a8a;--border: #374151;--border-light: #4b5563;--card-shadow: rgba(0, 0, 0, 0.3)}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth}body{font-family:var(--font-family);font-size:var(--font-size-base);line-height:var(--line-height-base);color:var(--text-primary);background-color:var(--bg-primary);transition:background-color var(--transition-base),color var(--transition-base)}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:var(--space-4);line-height:var(--line-height-tight);font-weight:700;color:var(--text-primary)}h1{font-size:var(--font-size-4xl)}h2{font-size:var(--font-size-3xl)}h3{font-size:var(--font-size-2xl)}h4{font-size:var(--font-size-xl)}h5{font-size:var(--font-size-lg)}h6{font-size:var(--font-size-base)}p{margin-top:0;margin-bottom:var(--space-4)}a{color:var(--accent);text-decoration:none;transition:color var(--transition-fast)}a:hover{color:var(--accent-hover)}img{max-width:100%;height:auto;display:block}ul,ol{padding-left:var(--space-4);margin-bottom:var(--space-4)}li{margin-bottom:var(--space-2)}hr{border:0;border-top:1px solid var(--border);margin:var(--space-6) 0}blockquote{border-left:4px solid var(--accent);padding-left:var(--space-4);margin-left:0;margin-right:0;font-style:italic;color:var(--text-secondary)}code{font-family:SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;background-color:var(--bg-secondary);padding:var(--space-1) var(--space-2);border-radius:var(--radius-md);font-size:var(--font-size-sm)}pre{background-color:var(--bg-secondary);padding:var(--space-4);border-radius:var(--radius-md);overflow-x:auto;margin-bottom:var(--space-4)}pre code{background-color:transparent;padding:0;border-radius:0}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0, 0, 0, 0);white-space:nowrap;border-width:0}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--space-4)}.site-container{display:flex;flex-direction:column;min-height:100vh}main{flex:1 0 auto}section{padding:var(--space-8) 0}@media (max-width: 768px){section{padding:var(--space-6) 0}}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--space-4)}.two-column-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-6)}@media (max-width: 768px){.two-column-grid{grid-template-columns:1fr}}.three-column-grid{display:grid;grid-template-columns:repeat(3, 1fr);gap:var(--space-4)}@media (max-width: 1024px){.three-column-grid{grid-template-columns:repeat(2, 1fr)}}@media (max-width: 640px){.three-column-grid{grid-template-columns:1fr}}.section-header{margin-bottom:var(--space-6);text-align:center}.section-title{margin-bottom:var(--space-2)}.page-header{background-color:var(--bg-secondary);padding:var(--space-8) 0;margin-bottom:var(--space-6)}.page-header h1{margin-bottom:var(--space-2)}.page-header .page-description{max-width:800px;margin:0 auto;color:var(--text-secondary)}.flex{display:flex}.flex-column{flex-direction:column}.items-center{align-items:center}.justify-between{justify-content:space-between}.justify-center{justify-content:center}.gap-4{gap:var(--space-4)}@media (max-width: 768px){.hidden-mobile{display:none}}@media (min-width: 768px){.hidden-desktop{display:none}}.btn{font-family:var(--font-family);display:inline-flex;align-items:center;justify-content:center;padding:var(--space-2) var(--space-4);font-weight:500;font-size:var(--font-size-base);line-height:1.5;text-align:center;text-decoration:none;border-radius:var(--radius-md);transition:all var(--transition-fast);cursor:pointer;border:none;white-space:nowrap}.btn:disabled{opacity:0.6;cursor:not-allowed}.btn-primary{background-color:var(--accent);color:white}.btn-primary:hover,.btn-primary:focus{background-color:var(--accent-hover);color:white;transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background-color:var(--bg-tertiary);color:var(--text-primary)}.btn-secondary:hover,.btn-secondary:focus{background-color:var(--border-light);transform:translateY(-1px)}.btn-secondary:active{transform:translateY(0)}.btn-outline{background-color:transparent;border:1px solid var(--border);color:var(--text-primary)}.btn-outline:hover,.btn-outline:focus{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}.btn-outline:active{transform:translateY(0)}.btn-sm{padding:var(--space-1) var(--space-2);font-size:var(--font-size-sm)}.btn-lg{padding:var(--space-3) var(--space-6);font-size:var(--font-size-lg)}.btn-icon svg,.btn-icon i{margin-right:var(--space-2)}.btn-group{display:flex;gap:var(--space-2)}@media (max-width: 640px){.btn-group{flex-direction:column}}.card{background-color:var(--bg-primary);border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 4px 6px var(--card-shadow);transition:transform var(--transition-base),box-shadow var(--transition-base);display:flex;flex-direction:column;height:100%}.card:hover{transform:translateY(-5px);box-shadow:0 10px 15px var(--card-shadow)}.card-image{position:relative;width:100%;overflow:hidden}.card-image img{width:100%;height:220px;object-fit:cover;transition:transform var(--transition-base)}.card:hover .card-image img{transform:scale(1.05)}.card-content{padding:var(--space-4);flex:1;display:flex;flex-direction:column}.card-title{margin-top:0;margin-bottom:var(--space-2);font-size:var(--font-size-xl)}.card-title a{color:var(--text-primary);text-decoration:none}.card-title a:hover{color:var(--accent)}.card-description{color:var(--text-secondary);margin-bottom:var(--space-4)}.card-tags{margin-top:auto;display:flex;flex-wrap:wrap;gap:var(--space-2)}.tag{display:inline-block;padding:var(--space-1) var(--space-2);background-color:var(--bg-tertiary);color:var(--text-secondary);font-size:var(--font-size-sm);border-radius:var(--radius-full)}.content-cards{display:grid;grid-template-columns:repeat(auto-fill, minmax(340px, 1fr));gap:var(--space-6)}@media (max-width: 640px){.content-cards{grid-template-columns:1fr}}.content-card{height:100%;border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 4px 6px var(--card-shadow);transition:transform var(--transition-base),box-shadow var(--transition-base);background-color:var(--bg-primary)}.content-card:hover{transform:translateY(-5px);box-shadow:0 10px 15px var(--card-shadow)}.content-card:hover .card-image img{transform:scale(1.05)}.content-card:hover .card-title{color:var(--accent)}.content-card:hover .read-more{color:var(--accent)}.content-card:hover .read-more svg{transform:translateX(4px)}.content-card .card-inner{display:flex;flex-direction:column;height:100%;color:var(--text-primary);text-decoration:none}.content-card .card-image{position:relative;height:200px;overflow:hidden}.content-card .card-image img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-base)}.content-card .card-image.card-image-placeholder{background-color:var(--bg-secondary);display:flex;align-items:center;justify-content:center}.content-card .card-image.card-image-placeholder .placeholder-icon{color:var(--text-tertiary);opacity:0.5}.content-card .card-excerpt{margin-bottom:var(--space-3);color:var(--text-secondary)}.content-card .card-meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-3);font-size:var(--font-size-sm);color:var(--text-secondary)}.content-card .read-more{display:flex;align-items:center;gap:var(--space-1);font-weight:500;font-size:var(--font-size-sm);color:var(--text-primary);margin-top:auto;transition:color var(--transition-fast)}.content-card .read-more svg{transition:transform var(--transition-fast)}.project-card{transition:transform var(--transition-base),box-shadow var(--transition-base);margin-bottom:var(--space-6)}.project-card .project-link{text-decoration:none;color:var(--text-primary);display:block}.project-card .project-image{border-radius:var(--radius-lg);overflow:hidden;margin-bottom:var(--space-3);max-height:150px}.project-card .project-image img{width:100%;height:150px;object-fit:cover;transition:transform var(--transition-base)}.project-card:hover{transform:translateY(-5px)}.project-card:hover .project-image img{transform:scale(1.05)}.project-card:hover .project-title{color:var(--accent)}.project-card .project-content{padding:var(--space-3)}.project-card .project-title{margin-bottom:var(--space-2);transition:color var(--transition-fast)}.project-card .project-description{color:var(--text-secondary);margin-bottom:var(--space-3)}.project-card .project-tags{display:flex;flex-wrap:wrap;gap:var(--space-2)}.project-category{margin-bottom:var(--space-3)}.main-category{display:inline-block;padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);font-size:var(--font-size-sm);font-weight:500}.main-category.data-science{background-color:rgba(79,70,229,0.1);color:#4F46E5}.main-category.web-development{background-color:rgba(16,185,129,0.1);color:#10B981}.main-category.backend{background-color:rgba(14,165,233,0.1);color:#0EA5E9}.main-category.devops{background-color:rgba(245,158,11,0.1);color:#F59E0B}.main-category.finance-tech{background-color:rgba(139,92,246,0.1);color:#8B5CF6}.projects-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(320px, 1fr));gap:var(--space-6)}@media (max-width: 640px){.projects-grid{grid-template-columns:1fr}}.blog-card .card-image img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-base)}.blog-card .card-image img:not([src]),.blog-card .card-image img[src=""],.blog-card .card-image img:not([src^="/"]){display:none}.blog-card .card-image img::after{content:attr(alt);position:absolute;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;background-color:var(--bg-secondary);color:var(--text-secondary);font-size:var(--font-size-sm)}.neon-card{position:relative;display:block;margin-bottom:var(--space-6);border-radius:var(--radius-lg);overflow:hidden;text-decoration:none;color:var(--text-primary);background-color:var(--bg-secondary);box-shadow:0 4px 6px var(--card-shadow);transition:all var(--transition-base)}.neon-card::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;border-radius:var(--radius-lg);padding:2px;background:linear-gradient(90deg, transparent, transparent);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;transition:background 0.3s ease}.neon-card:hover{transform:translateY(-5px);box-shadow:0 15px 30px rgba(0,0,0,0.1)}.neon-card:hover::before{background:linear-gradient(90deg, var(--accent) 0%, #4F46E5 25%, #10B981 50%, #F59E0B 75%, var(--accent) 100%);animation:neon-border 4s linear infinite}.neon-card:hover .card-image img{transform:scale(1.05)}.neon-card:hover .card-title{color:var(--accent)}.neon-card .card-inner{height:100%;display:flex;flex-direction:column}.neon-card .card-image{position:relative;overflow:hidden}.neon-card .card-image img{width:100%;height:200px;object-fit:cover;transition:transform var(--transition-base)}.neon-card .card-content{padding:var(--space-4);flex-grow:1;display:flex;flex-direction:column}.neon-card .card-title{margin-bottom:var(--space-2);font-size:var(--font-size-xl);transition:color var(--transition-fast)}.neon-card .card-description{margin-bottom:var(--space-4);color:var(--text-secondary);flex-grow:1}.neon-card .card-tags{display:flex;flex-wrap:wrap;gap:var(--space-2)}@keyframes neon-border{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}.form-container{max-width:600px;margin:0 auto}.form-group{margin-bottom:var(--space-4)}.form-field{position:relative;margin-bottom:var(--space-4)}.form-field.has-error .form-input{border-color:#dc3545}.form-label{display:block;margin-bottom:var(--space-2);font-weight:500;color:var(--text-primary)}.form-input{display:block;width:100%;padding:var(--space-3);font-size:var(--font-size-base);line-height:1.5;color:var(--text-primary);background-color:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px var(--accent-light)}.form-input::placeholder{color:var(--text-tertiary)}.form-input[type="textarea"],.form-input.textarea{min-height:150px;resize:vertical}.error-message{display:block;margin-top:var(--space-2);color:#dc3545;font-size:var(--font-size-sm)}.form-actions{margin-top:var(--space-6);display:flex;justify-content:flex-end}.form-actions button{min-width:150px}@media (max-width: 640px){.form-actions button{width:100%}}.contact-form{background-color:var(--bg-secondary);padding:var(--space-6);border-radius:var(--radius-lg);box-shadow:0 4px 6px var(--card-shadow);margin-bottom:var(--space-8)}.success-message{text-align:center;padding:var(--space-6);background-color:var(--bg-secondary);border-radius:var(--radius-lg)}.success-message h3{margin-bottom:var(--space-4);color:#28a745}.loading-spinner{display:inline-block;width:20px;height:20px;margin-right:var(--space-2);border:2px solid rgba(255,255,255,0.3);border-radius:50%;border-top-color:#fff;animation:spin 1s ease-in-out infinite}@keyframes spin{to{transform:rotate(360deg)}}.site-header{position:sticky;top:0;z-index:100;background-color:var(--bg-primary);border-bottom:1px solid var(--border);transition:background-color var(--transition-base),border-color var(--transition-base);padding:var(--space-3) 0}.header-inner{display:flex;align-items:center;justify-content:space-between}.site-logo{font-size:var(--font-size-xl);font-weight:700;color:var(--text-primary);text-decoration:none}.site-logo:hover{color:var(--accent)}.site-nav{display:flex;align-items:center}.nav-menu{display:flex;list-style:none;margin:0;padding:0;gap:var(--space-6)}@media (max-width: 768px){.nav-menu{position:fixed;top:60px;left:0;right:0;bottom:0;background-color:var(--bg-primary);flex-direction:column;justify-content:center;align-items:center;gap:var(--space-4);transform:translateX(100%);transition:transform var(--transition-base)}.nav-menu.active{transform:translateX(0)}}.nav-item{position:relative}.nav-item.active .nav-link{color:var(--accent)}.nav-link{color:var(--text-primary);text-decoration:none;font-weight:500;padding:var(--space-2) 0;transition:color var(--transition-fast)}.nav-link:hover{color:var(--accent)}.mobile-menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:var(--space-2);margin-right:var(--space-2)}@media (max-width: 768px){.mobile-menu-toggle{display:block}}.hamburger{display:block;width:24px;height:2px;background-color:var(--text-primary);position:relative;transition:background-color var(--transition-fast)}.hamburger::before,.hamburger::after{content:'';position:absolute;width:24px;height:2px;background-color:var(--text-primary);transition:transform var(--transition-fast)}.hamburger::before{top:-6px}.hamburger::after{bottom:-6px}[aria-expanded="true"] .hamburger{background-color:transparent}[aria-expanded="true"] .hamburger::before{transform:rotate(45deg);top:0}[aria-expanded="true"] .hamburger::after{transform:rotate(-45deg);bottom:0}body.menu-open{overflow:hidden}.hero{padding:var(--space-16) 0;position:relative}@media (max-width: 768px){.hero{padding:var(--space-10) 0}}.hero-content{max-width:800px;margin:0 auto;text-align:center}.hero-title{font-size:clamp(2.5rem, 5vw, 3.5rem);line-height:1.2;margin-bottom:var(--space-4)}.hero-title .accent{color:var(--accent)}.hero-subtitle{font-size:clamp(1.25rem, 3vw, 1.5rem);color:var(--text-secondary);margin-bottom:var(--space-6);line-height:1.5}.hero-cta{display:flex;gap:var(--space-3);justify-content:center}@media (max-width: 640px){.hero-cta{flex-direction:column;width:100%;max-width:300px;margin:0 auto}}.home-hero{position:relative;overflow:hidden}.home-hero::before{content:'';position:absolute;top:0;left:0;right:0;height:100%;background:radial-gradient(circle at 50% 50%, var(--accent-light) 0%, transparent 50%);opacity:0.1;z-index:-1}.about-hero{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:var(--space-8);padding:var(--space-12) 0}@media (max-width: 768px){.about-hero{grid-template-columns:1fr;text-align:center}}.about-hero .hero-content{text-align:left}@media (max-width: 768px){.about-hero .hero-content{text-align:center;order:2}}@media (max-width: 768px){.about-hero .hero-image{order:1;margin-bottom:var(--space-6)}}.about-hero .hero-image img{border-radius:var(--radius-xl);box-shadow:0 20px 25px -5px var(--card-shadow)}.theme-toggle{background:none;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;color:var(--text-primary);transition:background-color var(--transition-fast),color var(--transition-fast);position:relative}.theme-toggle:hover{background-color:var(--bg-tertiary)}.theme-toggle .sun-icon{opacity:0;position:absolute;transition:opacity var(--transition-fast)}.theme-toggle .moon-icon{opacity:1;transition:opacity var(--transition-fast)}[data-theme="dark"] .theme-toggle .sun-icon{opacity:1}[data-theme="dark"] .theme-toggle .moon-icon{opacity:0}@keyframes rotate{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}.theme-toggle:active svg{animation:rotate 0.5s ease-in-out}.theme-indicator{position:fixed;bottom:20px;right:20px;z-index:100;font-size:var(--font-size-sm);padding:var(--space-1) var(--space-3);border-radius:var(--radius-full);background-color:var(--bg-secondary);border:1px solid var(--border);box-shadow:0 2px 5px var(--card-shadow);transition:opacity var(--transition-fast);opacity:0;pointer-events:none}.theme-indicator.visible{opacity:1;animation:fade-out 2s forwards}@keyframes fade-out{0%{opacity:1}80%{opacity:1}100%{opacity:0}}.site-footer{background-color:var(--bg-secondary);padding:var(--space-8) 0;margin-top:auto;border-top:1px solid var(--border)}.footer-inner{display:flex;justify-content:space-between;align-items:center}@media (max-width: 768px){.footer-inner{flex-direction:column;text-align:center;gap:var(--space-4)}}.footer-info{color:var(--text-secondary)}.footer-info p{margin-bottom:var(--space-1)}.footer-social{display:flex;gap:var(--space-3)}.social-link{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:50%;color:var(--text-secondary);background-color:var(--bg-tertiary);transition:all var(--transition-fast)}.social-link:hover{color:var(--accent);background-color:var(--bg-primary);transform:translateY(-3px)}.footer-nav ul{display:flex;list-style:none;margin:0;padding:0;gap:var(--space-4)}@media (max-width: 768px){.footer-nav ul{justify-content:center}}.footer-nav a{color:var(--text-secondary);text-decoration:none}.footer-nav a:hover{color:var(--accent)}.footer-bottom{margin-top:var(--space-6);padding-top:var(--space-4);border-top:1px solid var(--border);text-align:center;color:var(--text-tertiary);font-size:var(--font-size-sm)}.popup-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:rgba(0,0,0,0.5);display:flex;align-items:center;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:opacity var(--transition-base),visibility var(--transition-base)}.popup-overlay.active{opacity:1;visibility:visible}.contact-popup{background-color:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:0 10px 25px rgba(0,0,0,0.2);width:90%;max-width:500px;overflow:hidden;transform:translateY(20px);transition:transform var(--transition-base)}.popup-overlay.active .contact-popup{transform:translateY(0)}.contact-popup .popup-header{padding:var(--space-4);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.contact-popup .popup-header h3{margin:0;font-size:var(--font-size-xl)}.contact-popup .popup-header 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