* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        :root {
            --primary-color: #1a1a2e;
            --secondary-color: #16213e;
            --accent-color: #0f4c75;
            --highlight-color: #00b4d8;
            --text-light: #f8f9fa;
            --text-dark: #333;
        }
        
        body {
            background-color: #f5f5f5;
            color: var(--text-dark);
            line-height: 1.6;
        }
        
        header {
            background: linear-gradient(rgba(26, 26, 46, 0.9), rgba(22, 33, 62, 0.9)), url('https://images.unsplash.com/photo-1531259683007-016a7b628fc3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: var(--text-light);
            padding: 2rem 1rem;
            text-align: center;
            min-height: 80vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        html {
            scroll-behavior: smooth;
        }   
        
        .logo-container {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1rem;
        }
        
        .logo {
            font-size: 2.5rem;
            margin-right: 1rem;
            color: var(--highlight-color);
        }
        
        h1 {
            font-size: 3.5rem;
            margin-bottom: 0.5rem;
            letter-spacing: 1px;
        }
        
        .tagline {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            font-weight: 300;
            color: #e0e0e0;
        }
        
        .nav-container {
            background-color: var(--primary-color);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        nav {
            display: flex;
            justify-content: center;
            padding: 0 1rem;
        }
        
        nav a {
            color: var(--text-light);
            text-decoration: none;
            padding: 1rem 2rem;
            transition: all 0.3s ease;
            font-weight: 500;
        }
        
        nav a:hover {
            background-color: var(--accent-color);
            color: var(--highlight-color);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem 1rem;
        }
        
        .section-title {
            text-align: center;
            font-size: 2.5rem;
            margin-bottom: 2rem;
            color: var(--primary-color);
            position: relative;
        }
        
        .section-title:after {
            content: '';
            position: absolute;
            width: 100px;
            height: 4px;
            background-color: var(--highlight-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }
        
        .card-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 2rem;
        }
        
        .card {
            background-color: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        
        .card-header {
            background-color: var(--secondary-color);
            color: white;
            padding: 1.5rem;
            text-align: center;
        }
        
        .card-body {
            padding: 1.5rem;
        }
        
        .btn {
            display: inline-block;
            background-color: var(--accent-color);
            color: white;
            padding: 0.8rem 1.8rem;
            border-radius: 5px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
            font-size: 1rem;
        }
        
        .btn:hover {
            background-color: var(--highlight-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 180, 216, 0.3);
        }
        
        .membership-card {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f4c75 100%);
            color: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            max-width: 500px;
            margin: 2rem auto;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        
        .membership-card:before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(0, 180, 216, 0.1) 0%, rgba(0, 180, 216, 0) 70%);
            z-index: 0;
        }
        
        .membership-card-content {
            position: relative;
            z-index: 1;
        }
        
        .membership-card h3 {
            font-size: 1.8rem;
            margin-bottom: 1rem;
            color: var(--highlight-color);
        }
        
        .member-id {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 0.8rem;
            border-radius: 5px;
            font-family: monospace;
            margin: 1rem 0;
            display: inline-block;
        }
        
        .donation-form {
            background-color: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            max-width: 600px;
            margin: 2rem auto;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        
        .form-control {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
        }
        
        .donation-amounts {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        
        .amount-btn {
            flex: 1;
            min-width: 80px;
            background-color: #f0f0f0;
            border: 2px solid #ddd;
            padding: 0.8rem;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
        }
        
        .amount-btn:hover, .amount-btn.active {
            background-color: var(--accent-color);
            color: white;
            border-color: var(--accent-color);
        }
        
        .charity-info {
            background-color: white;
            padding: 2rem;
            border-radius: 10px;
            margin-top: 2rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        footer {
            background-color: var(--primary-color);
            color: var(--text-light);
            text-align: center;
            padding: 2rem 1rem;
            margin-top: 3rem;
        }
        
        .social-links {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .social-links a {
            color: var(--text-light);
            font-size: 1.5rem;
            transition: color 0.3s ease;
        }
        
        .social-links a:hover {
            color: var(--highlight-color);
        }

        .payment-method {
            display: flex;
            gap: 1rem;
            margin-bottom: 1rem;
            justify-content: center;
        }

        .payment-btn {
            flex: 1;
            min-width: 100px;
            background-color: #f0f0f0;
            border: 2px solid #ddd;
            padding: 0.8rem;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            text-align: center;
        }
        .payment-btn:hover, .payment-btn.active {
            background-color: var(--accent-color);
            color: white;
            border-color: var(--accent-color);
        }
        
        /* Responsive design */
        @media (max-width: 768px) {
            h1 {
                font-size: 2.5rem;
            }
            
            .tagline {
                font-size: 1.2rem;
            }
            
            nav {
                flex-wrap: wrap;
            }
            
            nav a {
                padding: 0.8rem 1.2rem;
                font-size: 0.9rem;
            }
            
            .section-title {
                font-size: 2rem;
            }
            
            .card-container {
                grid-template-columns: 1fr;
            }
        }
        
        .hidden {
            display: none;
        }
        
        .modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.8);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }
        
        .modal-content {
            background-color: white;
            padding: 2rem;
            border-radius: 10px;
            max-width: 500px;
            width: 90%;
            text-align: center;
        }
        
        .close-modal {
            position: absolute;
            top: 1rem;
            right: 1.5rem;
            font-size: 1.5rem;
            cursor: pointer;
            color: #aaa;
        }
        
        .close-modal:hover {
            color: #000;
        }