*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:#333;background-color:#f4f4f4}header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:1rem 0;box-shadow:0 2px 5px #0000001a}nav{max-width:1200px;margin:0 auto;padding:0 2rem;display:flex;justify-content:space-between;align-items:center}nav h1{font-size:1.5rem}nav ul{display:flex;list-style:none;gap:2rem}nav a{color:#fff;text-decoration:none;transition:opacity .3s}nav a:hover{opacity:.8}main{max-width:1200px;margin:2rem auto;padding:0 2rem}.section{display:none;background:#fff;padding:2rem;border-radius:8px;box-shadow:0 2px 10px #0000001a;margin-bottom:2rem}.section.active{display:block}.section h2{color:#667eea;margin-bottom:1rem;border-bottom:2px solid #667eea;padding-bottom:.5rem}.api-demo{margin-top:2rem;padding:1rem;background:#f8f9fa;border-radius:5px}button{background:#667eea;color:#fff;border:none;padding:.75rem 1.5rem;border-radius:5px;cursor:pointer;font-size:1rem;transition:background .3s}button:hover{background:#5a6fd8}#api-result{margin-top:1rem;padding:1rem;background:#fff;border-radius:5px;border-left:4px solid #667eea;display:none}.post{background:#f8f9fa;padding:1.5rem;margin-bottom:1rem;border-radius:5px;border-left:4px solid #667eea}.post h3{color:#333;margin-bottom:.5rem}.post-meta{color:#666;font-size:.9rem;margin-bottom:1rem}.form-group{margin-bottom:1rem}label{display:block;margin-bottom:.5rem;font-weight:700;color:#333}input,textarea{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:5px;font-size:1rem}input:focus,textarea:focus{outline:none;border-color:#667eea;box-shadow:0 0 0 2px #667eea33}#contact-result{margin-top:1rem;padding:1rem;border-radius:5px;display:none}.success{background:#d4edda;color:#155724;border:1px solid #c3e6cb}.error{background:#f8d7da;color:#721c24;border:1px solid #f5c6cb}footer{background:#333;color:#fff;text-align:center;padding:2rem 0;margin-top:3rem}@media (max-width: 768px){nav{flex-direction:column;gap:1rem}nav ul{gap:1rem}main{padding:0 1rem}.section{padding:1rem}}