* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
            padding: 20px;
            min-height: 100vh;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        header {
            text-align: center;
            margin-bottom: 40px;
            padding: 20px;
            background: linear-gradient(135deg, #25d366, #128c7e);
            border-radius: 15px;
            color: white;
            box-shadow: 0 6px 15px rgba(18, 140, 126, 0.2);
        }
        
        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }
        
        .description {
            font-size: 1.1rem;
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.9;
        }
        
        .content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 50px;
        }
        
        @media (max-width: 768px) {
            .content {
                grid-template-columns: 1fr;
            }
        }
        
        .instructions {
            background-color: white;
            padding: 25px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        
        .features {
            background-color: white;
            padding: 25px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        
        h2 {
            color: #128c7e;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e0e0e0;
        }
        
        ul {
            padding-left: 20px;
            margin-bottom: 20px;
        }
        
        li {
            margin-bottom: 10px;
        }
        
        .code-example {
            background-color: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid #25d366;
            margin-top: 20px;
            overflow-x: auto;
        }
        
        .code-example code {
            font-family: 'Courier New', monospace;
            color: #333;
        }
        
        /* Floating WhatsApp Button Styles */
        .whatsapp-float {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 100;
        }
        
        .whatsapp-main-btn {
            width: 70px;
            height: 70px;
            background-color: #25d366;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 6px 20px rgba(37, 211, 102, 0.5);
            transition: all 0.3s ease;
            position: relative;
            z-index: 101;
        }
        
        .whatsapp-main-btn:hover {
            transform: scale(1.1);
            box-shadow: 0 8px 25px rgba(37, 211, 102, 0.7);
        }
        
        .whatsapp-main-btn i {
            font-size: 36px;
            color: white;
        }
        
        .whatsapp-menu {
            position: absolute;
            bottom: 80px;
            right: 0;
            width: 300px;
            background-color: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            padding: 20px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: all 0.4s ease;
        }
        
        .whatsapp-menu.active {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        
        .whatsapp-menu::before {
            content: '';
            position: absolute;
            bottom: -10px;
            right: 20px;
            width: 0;
            height: 0;
            border-left: 10px solid transparent;
            border-right: 10px solid transparent;
            border-top: 10px solid white;
        }
        
        .menu-title {
            font-weight: 600;
            color: #128c7e;
            margin-bottom: 15px;
            text-align: center;
            font-size: 1.2rem;
        }
        
        .whatsapp-options {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }
        
        .whatsapp-option {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 15px 10px;
            background-color: #f8f9fa;
            border-radius: 10px;
            text-decoration: none;
            color: #333;
            transition: all 0.3s ease;
            text-align: center;
        }
        
        .whatsapp-option:hover {
            background-color: #e9f7ef;
            transform: translateY(-5px);
            box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
        }
        
        .whatsapp-option i {
            font-size: 28px;
            color: #25d366;
            margin-bottom: 8px;
        }
        
        .option-title {
            font-weight: 600;
            font-size: 0.9rem;
            margin-bottom: 5px;
        }
        
        .option-desc {
            font-size: 0.8rem;
            color: #666;
        }
        
        .close-menu {
            position: absolute;
            top: 10px;
            right: 10px;
            background: none;
            border: none;
            color: #888;
            cursor: pointer;
            font-size: 18px;
            transition: color 0.3s;
        }
        
        .close-menu:hover {
            color: #25d366;
        }
        
        footer {
            text-align: center;
            margin-top: 50px;
            padding-top: 20px;
            border-top: 1px solid #e0e0e0;
            color: #666;
            font-size: 0.9rem;
        }
        
        .note {
            background-color: #fff8e1;
            padding: 15px;
            border-radius: 10px;
            margin-top: 20px;
            border-left: 4px solid #ffc107;
        }
        
        .note h3 {
            color: #ff9800;
            margin-bottom: 8px;
        }