* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, sans-serif;
        }

        html, body {
            height: 100%;
            overflow: hidden;
        }

        body {
            background-color: #ffffff;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            align-items: center;
        }

        /* Header Solid Bar */
        header {
            width: 100%;
            max-width: 500px;
            padding: 15px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #fff;
            border-bottom: 1px solid #eee;
            z-index: 10;
        }

        .header-left, .header-right, .logo-section {
            display: flex;
            align-items: center;
            text-decoration: none;
            cursor: pointer;
        }

        .logo-section {
            gap: 8px;
            color: #25D366;
            font-weight: bold;
            font-size: 1.1rem;
        }

        /* Main Content */
        main {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 100%;
            max-width: 400px;
            padding: 0 20px;
        }

        .profile-link {
            text-decoration: none;
            margin-bottom: 15px;
        }

        .profile-img {
            width: 120px;
            height: 120px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid #f0f0f0;
        }

        h1 {
            font-size: 1.4rem;
            color: #333;
            margin-bottom: 25px;
        }

        .btn-whatsapp {
            background-color: #12cf5d;
            color: white;
            text-decoration: none;
            width: 100%;
            padding: 14px;
            border-radius: 30px;
            text-align: center;
            font-weight: bold;
            font-size: 1rem;
            margin-bottom: 15px;
            box-shadow: 0 4px 12px rgba(18, 207, 93, 0.2);
        }

        .download-text {
            font-size: 0.85rem;
            color: #777;
            text-align: center;
            line-height: 1.4;
        }

        .download-text a {
            color: #333;
            font-weight: bold;
            text-decoration: underline;
        }

        /* Footer Hitam Konsisten */
        footer {
            background-color: #000000;
            padding: 30px 20px;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
            border-top-left-radius: 20px;
            border-top-right-radius: 20px;
        }

        .btn-unduh {
            background-color: #12cf5d;
            color: white;
            text-decoration: none;
            width: 100%;
            max-width: 320px;
            padding: 12px;
            border-radius: 30px;
            text-align: center;
            font-weight: bold;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
        }

        .social-icons {
            display: flex;
            gap: 15px;
        }

        .social-icons a {
            color: white;
            font-size: 1.2rem;
            border: 1px solid #333;
            width: 45px;
            height: 45px;
            display: flex;
            justify-content: center;
            align-items: center;
            border-radius: 50%;
            text-decoration: none;
        }

        @media (min-width: 768px) {
            body { background-color: #f4f4f4; }
            header, main, footer {
                max-width: 450px;
                background-color: white;
            }
            footer {
                background-color: #000;
                border-top-left-radius: 0;
                border-top-right-radius: 0;
            }
        }