:root{--bg-color: #1a1a1a;--text-color: #f0f0f0;--primary-color: #4CAF50;--secondary-color: #333;--link-color: #81c784}body{margin:0;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--bg-color);color:var(--text-color);line-height:1.6}a{color:var(--link-color);text-decoration:none;transition:color .3s}a:hover{color:#a5d6a7;text-decoration:underline}.container{max-width:1200px;margin:0 auto;padding:0 20px}section{padding:60px 0}h1,h2,h3{margin-top:0}h1{font-size:2.5rem;margin-bottom:20px}h2{font-size:2rem;margin-bottom:30px;border-bottom:2px solid var(--primary-color);display:inline-block;padding-bottom:10px}h3{font-size:1.5rem;margin-bottom:15px;color:var(--primary-color)}.btn{display:inline-block;background-color:var(--primary-color);color:#fff;padding:12px 24px;border-radius:4px;font-weight:700;cursor:pointer;border:none;font-size:1rem}.btn:hover{background-color:#43a047;text-decoration:none;color:#fff}input,textarea{width:100%;padding:12px;margin-bottom:15px;background-color:#333;border:1px solid #555;color:#fff;border-radius:4px;box-sizing:border-box}input:focus,textarea:focus{outline:none;border-color:var(--primary-color)}.card{background-color:#252525;padding:20px;border-radius:8px;box-shadow:0 4px 6px #0000004d;margin-bottom:20px}