:root {
            --primary-color: #008B8B;
            --secondary-color: #005555;
            --accent-color: #FF6B6B;
            --light-bg: #f5f8fa;
            --dark-text: #333;
            --light-text: #fff;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background-color: var(--light-bg);
            color: var(--dark-text);
            line-height: 1.6;
        }
        
        header {
            background-color: #fff;
            padding: 1rem;
            display: flex;
            align-items: center;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        #doctor_cube_logo {
            height: 40px;
            margin-right: 10px;
        }
        
        .logo-text {
            font-size: 1.5rem;
            font-weight: bold;
            color: var(--primary-color);
        }
        
        .header-contact {
            margin-left: auto;
            display: flex;
            align-items: center;
        }
        
        .header-contact i {
            color: var(--primary-color);
            margin-right: 8px;
        }
        
        .app-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem;
        }
        
        .hero-section {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            margin-bottom: 3rem;
        }
        
        .hero-content {
            flex: 1;
            padding-right: 2rem;
        }
        
        .hero-content h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: var(--dark-text);
        }
        
        .hero-content h1 span {
            color: var(--primary-color);
            font-weight: bold;
        }
        
        .hero-content p {
            font-size: 1.1rem;
            margin-bottom: 1.5rem;
            color: #555;
        }
        
        .hero-image {
            flex: 1;
            display: flex;
            justify-content: center;
        }
        
        .app-mockup {
            max-width: 300px;
            box-shadow: var(--box-shadow);
            border-radius: 20px;
        }
        
        .download-section {
            background-color: #fff;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            text-align: center;
            width: 100%;
            margin-bottom: 3rem;
        }
        
        .download-section h2 {
            font-size: 2rem;
            margin-bottom: 1.5rem;
            color: var(--primary-color);
        }
        
        .download-options {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-top: 2rem;
            flex-wrap: wrap;
        }
        
        .download-button {
            display: flex;
            align-items: center;
            background-color: var(--primary-color);
            color: var(--light-text);
            padding: 0.8rem 1.5rem;
            border-radius: var(--border-radius);
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s ease;
            font-size: 1.1rem;
        }
        
        .download-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-3px);
        }
        
        .download-button i {
            margin-right: 10px;
            font-size: 1.3rem;
        }
        
        .app-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            width: 100%;
            margin-bottom: 3rem;
        }
        
        .feature-card {
            background-color: #fff;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            text-align: center;
            transition: transform 0.3s ease;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .feature-title {
            font-size: 1.2rem;
            font-weight: bold;
            margin-bottom: 0.5rem;
        }
        
        .feature-desc {
            color: #666;
        }
        
        .qr-section {
            display: flex;
            flex-direction: column;
            align-items: center;
            background-color: #fff;
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            width: 100%;
            margin-bottom: 3rem;
        }
        
        .qr-code {
            width: 180px;
            height: 180px;
            margin: 1.5rem 0;
            background-color: #f0f0f0;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .qr-code img {
            width: 150px;
            height: 150px;
        }
        
        .cta-text {
            font-size: 1.1rem;
            margin-bottom: 1rem;
        }
        
        footer {
            background-color: var(--dark-text);
            color: var(--light-text);
            padding: 2rem;
            text-align: center;
        }
        
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            max-width: 1200px;
            margin: 0 auto;
            margin-bottom: 2rem;
        }
        
        .footer-section {
            flex: 1;
            min-width: 250px;
            margin-bottom: 1.5rem;
        }
        
        .footer-section h3 {
            margin-bottom: 1rem;
            color: var(--light-text);
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-section h3::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 30px;
            height: 2px;
            background-color: var(--primary-color);
        }
        
        .contact-info {
            margin-bottom: 0.5rem;
        }
        
        .contact-info i {
            color: var(--primary-color);
            margin-right: 8px;
        }
        
        .social-links {
            display: flex;
            gap: 1rem;
            margin-top: 1rem;
        }
        
        .social-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: #444;
            color: var(--light-text);
            border-radius: 50%;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .social-link:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }
        
        .copyright {
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
        }
        
        .whatsapp-btn {
            position: fixed;
            bottom: 20px;
            right: 20px;
            width: 60px;
            height: 60px;
            background-color: #25D366;
            color: white;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 1.8rem;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
            text-decoration: none;
            z-index: 1000;
            transition: all 0.3s ease;
        }
        
        .whatsapp-btn:hover {
            transform: scale(1.1);
        }
        
        .whatsapp-btn .tooltip {
            position: absolute;
            right: 75px;
            background-color: #333;
            color: white;
            padding: 5px 10px;
            border-radius: 5px;
            font-size: 0.8rem;
            opacity: 0;
            transition: opacity 0.3s ease;
            pointer-events: none;
            white-space: nowrap;
        }
        
        .whatsapp-btn:hover .tooltip {
            opacity: 1;
        }
        
        /* Responsive styles */
        @media (max-width: 768px) {
            .hero-section {
                flex-direction: column;
                text-align: center;
            }
            
            .hero-content {
                padding-right: 0;
                margin-bottom: 2rem;
            }
            
            .download-options {
                flex-direction: column;
                align-items: center;
                gap: 1rem;
            }
            
            .app-container {
                padding: 1rem;
            }
        }