:root{--primary-color:#2563eb;--primary-dark:#1d4ed8;--text-color:#1f2937;--text-light:#6b7280;--background:#f9fafb;--white:#ffffff;--shadow:0 4px 6px -1px rgba(0,0,0,.1),0 2px 4px -1px rgba(0,0,0,.06);--radius:8px}*{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-color);background-color:var(--background)}.container{max-width:1200px;margin:0 auto;padding:0 20px}header{background-color:var(--white);box-shadow:var(--shadow);position:sticky;top:0;z-index:100}.nav-container{display:flex;justify-content:space-between;align-items:center;padding:20px 0}.logo{font-size:24px;font-weight:700;color:var(--primary-color);text-decoration:none}.logo span{color:var(--text-color)}nav ul{display:flex;list-style:none}nav ul li{margin-left:30px}nav ul li a{text-decoration:none;color:var(--text-color);font-weight:500;transition:color .3s}nav ul li a:hover{color:var(--primary-color)}.hero{padding:80px 0;text-align:center;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:white}.hero h1{font-size:48px;margin-bottom:20px}.hero p{font-size:20px;max-width:700px;margin:0 auto 30px}.btn{display:inline-block;background-color:var(--primary-color);color:white;padding:12px 30px;border-radius:var(--radius);text-decoration:none;font-weight:600;transition:background-color .3s;border:none;cursor:pointer}.btn:hover{background-color:var(--primary-dark)}.btn-secondary{background-color:transparent;border:2px solid white;margin-left:15px}.btn-secondary:hover{background-color:rgba(255,255,255,.1)}section{padding:80px 0}.section-title{text-align:center;margin-bottom:50px}.section-title h2{font-size:36px;margin-bottom:15px}.section-title p{color:var(--text-light);max-width:600px;margin:0 auto}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:30px;margin-top:50px}.feature-card{background-color:var(--white);padding:30px;border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .3s}.feature-card:hover{transform:translateY(-5px)}.feature-icon{font-size:40px;margin-bottom:20px;color:var(--primary-color)}.feature-card h3{margin-bottom:15px;font-size:22px}.download-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-top:40px}.download-card{background-color:var(--white);padding:30px;border-radius:var(--radius);box-shadow:var(--shadow);text-align:center;transition:transform .3s}.download-card:hover{transform:translateY(-5px)}.platform-icon{font-size:50px;margin-bottom:20px}.download-card h3{margin-bottom:15px}.download-card p{color:var(--text-light);margin-bottom:20px}.download-links{display:flex;flex-direction:column;gap:10px}.download-links .btn{width:100%;text-align:center;margin:0}.history{background-color:var(--white)}.history-content{max-width:800px;margin:0 auto}.history-content p{margin-bottom:20px}footer{background-color:var(--text-color);color:var(--white);padding:50px 0 20px}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:40px;margin-bottom:40px}.footer-column h3{margin-bottom:20px;font-size:18px}.footer-column ul{list-style:none}.footer-column ul li{margin-bottom:10px}.footer-column ul li a{color:#d1d5db;text-decoration:none;transition:color .3s}.footer-column ul li a:hover{color:var(--white)}.copyright{text-align:center;padding-top:20px;border-top:1px solid #374151;color:#9ca3af}@media (max-width:768px){.nav-container{flex-direction:column}nav ul{margin-top:20px}nav ul li{margin-left:15px;margin-right:15px}.hero h1{font-size:36px}.hero p{font-size:18px}.section-title h2{font-size:28px}.download-links{flex-direction:column}}