body {
            font-family: Arial, Helvetica, sans-serif;
            background: #181818;
            color: #f7f7f7;
            margin: 0;
            padding: 0;
            line-height: 1.7;
        }
        header {
            background: #23272a;
            padding: 20px 0;
            text-align: center;
        }
        header img.logo {
            width: 64px;
            height: 64px;
            vertical-align: middle;
        }
        header h1 {
            display: inline-block;
            margin: 0 0 0 15px;
            font-size: 2.2em;
            color: #fff;
            vertical-align: middle;
            letter-spacing: 2px;
        }
        nav {
            margin-top: 10px;
        }
        nav a {
            color: #ffb400;
            text-decoration: none;
            margin: 0 15px;
            font-weight: bold;
            font-size: 1em;
        }
        .container {
            max-width: 1100px;
            margin: 40px auto;
            padding: 0 20px;
        }
        h2 {
            color: #ffb400;
            margin-top: 40px;
        }
        .responsive {
            width: 100%;
            height: auto;
            max-width: 600px;
            display: block;
            margin: 30px auto 15px auto;
            border-radius: 12px;
            box-shadow: 0 4px 16px rgba(0,0,0,0.5);
        }
        .center-btn {
            display: flex;
            justify-content: center;
            margin-bottom: 40px;
        }
        .cta-btn {
            background: #ffb400;
            color: #23272a;
            padding: 16px 36px;
            border: none;
            border-radius: 30px;
            font-size: 1.3em;
            font-weight: bold;
            cursor: pointer;
            margin-top: 10px;
            box-shadow: 0 2px 6px rgba(0,0,0,0.2);
            transition: background 0.2s;
            text-decoration: none;
        }
        .cta-btn:hover {
            background: #ff8800;
            color: #fff;
        }
        footer {
            background: #23272a;
            color: #aaa;
            text-align: center;
            padding: 30px 10px 15px 10px;
            margin-top: 60px;
        }
        footer a {
            color: #ffb400;
            text-decoration: none;
        }
        @media (max-width: 700px) {
            .container {
                padding: 0 8px;
            }
            header h1 {
                font-size: 1.2em;
            }
        }