:root{--bg-primary:#fff;--bg-secondary:#f8f9fa;--text-primary:#333;--text-secondary:#666;--text-muted:#999;--border-color:#e9ecef;--shadow-color:rgba(0,0,0,.1);--shadow-hover:rgba(0,0,0,.15);--header-bg:rgba(255,255,255,.95);--card-bg:#fff;--form-bg:#f8f9fa;--input-border:#ddd;--footer-bg:#2c3e50;--footer-text:#fff}[data-theme="dark"]{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--text-primary:#e0e0e0;--text-secondary:#b0b0b0;--text-muted:#888;--border-color:#404040;--shadow-color:rgba(0,0,0,.3);--shadow-hover:rgba(0,0,0,.4);--header-bg:rgba(26,26,26,.95);--card-bg:#2d2d2d;--form-bg:#2d2d2d;--input-border:#404040;--footer-bg:#0d1117;--footer-text:#e0e0e0}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--bg-primary);overflow-x:hidden;transition:background-color .3s ease , color .3s ease}.container{max-width:1200px;margin:0 auto;padding:0 20px}header{position:fixed;top:0;left:0;right:0;background:var(--header-bg);backdrop-filter:blur(10px);z-index:1000;box-shadow:0 2px 20px var(--shadow-color);transition:background-color .3s ease}nav{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem}.logo h1{color:var(--text-primary);font-size:1.8rem;font-weight:bold}.nav-links{display:flex;list-style:none;gap:2rem}.nav-links a{text-decoration:none;color:var(--text-primary);font-weight:500;transition:color .3s ease}.nav-links a:hover{color:#3498db}.burger{display:none;flex-direction:column;cursor:pointer}.theme-toggle{background:none;border:none;color:var(--text-primary);font-size:1.2rem;cursor:pointer;padding:8px;border-radius:50%;transition:all .3s ease;margin-right:1rem;-webkit-tap-highlight-color:transparent;touch-action:manipulation;user-select:none;-webkit-user-select:none}.theme-toggle:hover,.theme-toggle:active,.theme-toggle:focus{background:var(--bg-secondary);transform:scale(1.1);outline:none}.burger{background:none;border:none;padding:8px;cursor:pointer;-webkit-tap-highlight-color:transparent;touch-action:manipulation;user-select:none;-webkit-user-select:none}.burger:active,.burger:focus{outline:none}.burger span{display:block;width:25px;height:3px;background:var(--text-primary);margin:3px 0;transition:.3s}.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}.hero{height:100vh;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;position:relative}.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.3)}[data-theme="dark"] .hero{background:linear-gradient(135deg,#2c3e50 0%,#34495e 100%)}[data-theme="dark"] .hero::before{background:rgba(0,0,0,.6)}.hero-content{position:relative;z-index:1}.hero h1{font-size:3.5rem;margin-bottom:1rem;animation:fadeInUp 1s ease}.hero p{font-size:1.3rem;margin-bottom:2rem;opacity:.9;animation:fadeInUp 1s ease .2s both}.hero-buttons{animation:fadeInUp 1s ease .4s both}.btn{display:inline-block;padding:12px 30px;text-decoration:none;border-radius:5px;font-weight:600;transition:all .3s ease;margin:0 10px;border:none;cursor:pointer}.btn.primary{background:#3498db;color:#fff}.btn.primary:hover{background:#2980b9;transform:translateY(-2px)}.btn.secondary{background:transparent;color:#fff;border:2px solid #fff}.btn.secondary:hover{background:#fff;color:#333;transform:translateY(-2px)}section{padding:80px 0}section h2{text-align:center;font-size:2.5rem;margin-bottom:3rem;color:#2c3e50;position:relative}section h2::after{content:'';position:absolute;bottom:-10px;left:50%;transform:translateX(-50%);width:60px;height:4px;background:#3498db;border-radius:2px}.about{background:var(--bg-secondary)}.about-text{max-width:800px;margin:0 auto;text-align:center}.about-text p{font-size:1.1rem;margin-bottom:2rem;color:#666;line-height:1.8}.info-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;margin-top:3rem}.info-item{display:flex;flex-direction:column;align-items:center;text-align:center;gap:.5rem;padding:1.5rem;background:var(--card-bg);border-radius:10px;box-shadow:0 5px 15px var(--shadow-color);transition:transform .3s ease}.info-item:hover{transform:translateY(-5px)}.info-item i{font-size:2.5rem;color:#3498db;margin-bottom:.5rem}.info-item h4{margin:0;color:var(--text-primary);font-size:1.1rem}.info-item p{color:var(--text-secondary);margin:0}.cert-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin-top:2rem}.cert-card{background:var(--card-bg);padding:2rem;border-radius:10px;text-align:center;box-shadow:0 5px 15px var(--shadow-color);transition:all .3s ease}.cert-card:hover{transform:translateY(-5px);box-shadow:0 10px 25px var(--shadow-hover)}.cert-icon{width:80px;height:80px;background:linear-gradient(135deg,#3498db,#2980b9);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem}.cert-icon i{font-size:2rem;color:#fff}.cert-card h3{margin-bottom:.5rem;color:#2c3e50}.cert-card p{color:var(--text-secondary);font-weight:600}.projects{padding:80px 0}.projects-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:2rem;margin-top:2rem}.project-card{background:var(--card-bg);border-radius:15px;padding:2rem;box-shadow:0 5px 20px var(--shadow-color);transition:all .3s ease;border:1px solid var(--border-color);position:relative;overflow:hidden}.project-card::before{content:'';position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(135deg,#667eea,#764ba2)}.project-card:hover{transform:translateY(-10px);box-shadow:0 15px 40px var(--shadow-hover)}.project-icon{width:80px;height:80px;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:20px;display:flex;align-items:center;justify-content:center;margin-bottom:1.5rem}.project-icon i{font-size:2rem;color:#fff}.project-card h3{font-size:1.4rem;color:#2c3e50;margin-bottom:1rem;font-weight:600}.project-card p{color:var(--text-secondary);line-height:1.6;margin-bottom:1.5rem}.project-tech{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.5rem}.tech-tag{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:.3rem .8rem;border-radius:20px;font-size:.85rem;font-weight:500}.project-links{display:flex;gap:1rem}.project-link{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.2rem;background:var(--bg-secondary);color:var(--text-primary);text-decoration:none;border-radius:8px;font-weight:500;transition:all .3s ease;border:1px solid var(--border-color)}.project-link:hover{background:#3498db;color:#fff;transform:translateY(-2px)}.project-link i{font-size:1rem}.view-all-projects{text-align:center;margin-top:3rem}.view-all-projects .btn{display:inline-flex;align-items:center;gap:.5rem;padding:15px 30px;font-size:1.1rem}.skills{background:var(--bg-secondary)}.skills-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(350px,1fr));gap:2rem;margin-top:2rem}.skill-card{background:var(--card-bg);padding:2.5rem;border-radius:10px;text-align:center;box-shadow:0 5px 15px var(--shadow-color);transition:all .3s ease}.skill-card:hover{transform:translateY(-5px);box-shadow:0 10px 25px var(--shadow-hover)}.skill-icon{width:100px;height:100px;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1.5rem}.skill-icon i{font-size:2.5rem;color:#fff}.skill-card h3{margin-bottom:1rem;color:#2c3e50}.skill-card p{color:var(--text-secondary);line-height:1.6}.contact-content{max-width:100%;margin:2rem auto 0}.contact-info{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem;justify-items:center}.contact-item{display:flex;flex-direction:column;align-items:center;text-align:center;gap:.5rem;padding:1.5rem;background:var(--card-bg);border-radius:10px;box-shadow:0 5px 15px var(--shadow-color);transition:transform .3s ease;width:100%;max-width:250px}.contact-item:hover{transform:translateY(-5px)}.contact-item i{font-size:2.5rem;color:#3498db;margin-bottom:.5rem}.contact-item h4{margin:0;color:var(--text-primary);font-size:1.1rem}.contact-item p{color:var(--text-secondary);margin:0}.contact-item a{color:#3498db;text-decoration:none}.contact-item a:hover{text-decoration:underline}.contact-form{background:var(--form-bg);padding:2rem;border-radius:10px}.form-group{margin-bottom:1.5rem}.form-group input,.form-group textarea{width:100%;padding:12px;border:1px solid var(--input-border);border-radius:5px;font-size:1rem;background:var(--card-bg);color:var(--text-primary);transition:border-color .3s ease , background-color .3s ease}.form-group input:focus,.form-group textarea:focus{outline:none;border-color:#3498db}footer{background:var(--footer-bg);color:var(--footer-text);text-align:center;padding:2rem 0;transition:background-color .3s ease , color .3s ease}.social-links{margin-top:1rem}.social-links a{color:var(--footer-text);font-size:1.5rem;margin:0 10px;transition:color .3s ease}.social-links a:hover{color:#3498db}@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}@media (max-width:768px){nav{position:relative}.theme-toggle{order:1;margin-right:.5rem;margin-left:.5rem;min-width:44px;min-height:44px;display:flex;align-items:center;justify-content:center}.burger{order:2;min-width:44px;min-height:44px;display:flex;flex-direction:column;align-items:center;justify-content:center}.nav-links{position:fixed;top:70px;right:-100%;background:var(--card-bg);flex-direction:column;width:100%;height:calc(100vh - 70px);justify-content:start;align-items:center;padding-top:2rem;transition:right .3s ease;box-shadow:0 2px 20px var(--shadow-color)}.nav-links.active{right:0}.burger{display:flex}.burger.active span:nth-child(1) {transform:rotate(-45deg) translate(-5px,6px)}.burger.active span:nth-child(2) {opacity:0}.burger.active span:nth-child(3) {transform:rotate(45deg) translate(-5px,-6px)}.hero h1{font-size:2.5rem}.hero p{font-size:1.1rem}section{padding:60px 0}section h2{font-size:2rem}.info-grid{grid-template-columns:repeat(2,1fr);gap:1rem}.cert-grid,.projects-grid,.skills-grid{grid-template-columns:1fr}.hero-buttons .btn{display:block;margin:10px auto;width:fit-content}}@media (max-width:480px){nav{padding:1rem}.hero h1{font-size:2rem}.hero p{font-size:1rem}.container{padding:0 15px}.cert-card,.skill-card{padding:1.5rem}.skill-icon,.cert-icon{width:60px;height:60px}.skill-icon i,.cert-icon i{font-size:1.5rem}.contact-info{grid-template-columns:repeat(2,1fr);gap:1rem}.contact-item{padding:1rem;max-width:none}.contact-item i{font-size:2rem}.contact-item h4{font-size:1rem}.info-grid{grid-template-columns:1fr;gap:1rem}.info-item{padding:1rem}}