/* --- 🎨 THEME & CORE STYLES 🎨 --- */
        :root {
            --primary: #6a5af9; --primary-light: #8b7ffc;
            --accent: #ff7b2e; --accent-light: #ff9a63;
            --light-bg: #f8f9fa; --light-card: #ffffff; --light-input: #f1f3f5;
            --dark: #212529; --secondary: #6c757d;
            --text-primary: #212529; --text-secondary: #6c757d; --text-on-dark: #ffffff;
            --success: #28a745; --danger: #dc3545; --danger-hover: #c82333;
            --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.05); --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease; --border-radius: 12px;
            --gradient: linear-gradient(90deg, var(--primary), var(--accent));
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Poppins', sans-serif;
            background-color: #e9ecef;
            color: var(--text-primary);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        img { max-width: 100%; display: block; }
        button, input, select { font: inherit; outline: none; border: none; }
        .container { width: 100%; padding: 0 16px; }

        .mobile-container {
            max-width: 450px; margin: 0 auto;
            background-color: var(--light-bg);
            min-height: 100vh;
            box-shadow: 0 0 20px rgba(0,0,0,0.1);
            position: relative;
            padding-bottom: 80px; /* Space for footer */
        }

        .banner-wrapper {
            background-image: url('logo/genshin.jpg'); /* <-- Genshin Banner Image */
            background-size: cover; background-position: center;
            position: relative; padding: 2.5rem 0;
            color: var(--text-on-dark);
        }
        .banner-wrapper::before {
            content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
            background: linear-gradient(to top, rgba(18, 18, 28, 1) 0%, rgba(18, 18, 28, 0.5) 100%); z-index: 1;
        }
        .banner-content {
            position: relative; z-index: 2; display: flex; flex-direction: column;
            align-items: center; text-align: center;
        }
        .banner-icon {
            width: 80px; height: 80px;
            border-radius: 16px; border: 3px solid rgba(255,255,255,0.8);
            box-shadow: 0 5px 20px rgba(0,0,0,0.4); margin-bottom: 1rem;
        }
        .game-title { font-size: 1.8rem; margin-bottom: 0.75rem; text-shadow: 2px 2px 4px rgba(0,0,0,0.7); }
        
        /* --- ✨ NEW BANNER FEATURES ✨ --- */
        .banner-features {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 0.75rem;
            margin-top: 1.25rem;
            flex-wrap: wrap; /* For smaller screens */
        }
        .feature-item {
            display: flex;
            align-items: center;
            background: rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(5px);
            padding: 0.4rem 0.8rem;
            border-radius: 50px; /* Pill shape */
            font-size: 0.8rem;
            font-weight: 500;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
        }
        .feature-item i {
            margin-right: 0.5rem;
            color: var(--accent-light);
        }
        
        .main-content-wrapper { padding-top: 2rem; }
        .section-header { text-align: center; margin-bottom: 1.5rem; }
        .section-header h2 {
            font-size: 1.5rem; font-weight: 600; color: var(--text-primary);
            position: relative; padding-bottom: 10px; display: inline-block;
        }
        .section-header h2::after {
            content: ''; position: absolute; bottom: 0; left: 50%;
            transform: translateX(-50%); height: 3px; width: 50px;
            background: var(--gradient); border-radius: 3px;
        }

        /* --- ✨ UPDATED DIAMOND GRID STYLES ✨ --- */
        .diamond-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); /* Responsive grid */
            gap: 0.5rem; /* Reduced gap */
        }
        .diamond-card {
            background: var(--light-card); border-radius: 8px; /* Slightly smaller radius */
            border: 1px solid #e9ecef; /* Thinner border */
            text-align: center; cursor: pointer;
            transition: var(--transition); overflow: hidden; position: relative;
            box-shadow: none; /* Cleaner look */
        }
        .diamond-card:hover { transform: translateY(-3px); border-color: var(--primary); }
        .diamond-card.selected {
            border-color: var(--accent); box-shadow: 0 0 10px rgba(255, 123, 46, 0.4);
            transform: scale(1.05);
        }
        .diamond-img {
            width: 100%; height: 35px; /* Smaller image */
            object-fit: contain; padding: 0.3rem; margin-bottom: 2px;
            border-bottom: 1px solid #f0f0f0;
        }
        .diamond-content { padding: 0.4rem; }
        .diamond-title { font-size: 0.7rem; font-weight: 500; color: var(--text-secondary); height: 2.1em; overflow: hidden;}
        .diamond-price { font-size: 0.8rem; font-weight: 700; color: var(--accent); margin-top: 2px; }

        .user-details-container {
            background: var(--light-card); border-radius: var(--border-radius);
            padding: 1.5rem; box-shadow: var(--shadow-md);
            margin-top: -50px;
            position: relative; z-index: 10; margin-bottom: 2rem;
        }
        .form-group { margin-bottom: 1rem; }
        .input-group { position: relative; }
        .input-group i {
            position: absolute; left: 15px; top: 50%; transform: translateY(-50%);
            color: var(--text-secondary); transition: var(--transition); pointer-events: none;
        }
        .form-control {
            width: 100%; padding: 0.75rem; border: 1px solid #dee2e6;
            border-radius: 8px; transition: var(--transition); background-color: var(--light-input);
            color: var(--text-primary); font-size: 1rem;
        }
        .input-with-icon { padding-left: 45px; }

        .form-control:focus {
            border-color: var(--primary); background-color: var(--light-card);
            box-shadow: 0 0 0 3px rgba(106, 90, 249, 0.3);
        }
        .form-control:focus ~ i { color: var(--primary); }

        /* --- ✨ UPDATED PAYMENT SECTION STYLES ✨ --- */
        .purchase-section {
            background: var(--light-card); border-radius: var(--border-radius); padding: 1.5rem;
            box-shadow: var(--shadow-sm); margin-top: 2rem;
        }
        .price-summary {
              text-align: center;
              margin: 1.5rem 0;
              border-top: 1px solid #f1f3f5;
              border-bottom: 1px solid #f1f3f5;
              padding: 1rem 0;
        }
        .price-summary h3 {
            font-size: 1rem; color: var(--text-secondary); font-weight: 500; margin-bottom: 0.5rem;
        }
        .total-price { font-size: 1.8rem; font-weight: 700; color: var(--accent); }
        
        /* --- Button row update --- */
        .payment-options {
            display: flex;
            gap: 1rem;
            margin-top: 1.5rem;
        }
        .payment-btn {
            display: flex; align-items: center; justify-content: center;
            flex: 1; /* Make buttons share space equally */
            padding: 0.6rem;
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid #dee2e6;
            background-color: #fff;
            min-height: 48px; /* Ensure consistent height */
        }
        .payment-btn:hover:not(:disabled) { border-color: var(--primary); background-color: #f8f9fa; }
        .payment-btn:disabled { background: #e9ecef; cursor: not-allowed; opacity: 0.7; }
        .payment-btn img {
            height: 24px; /* Maintain consistent height */
            width: auto; /* Maintain aspect ratio */
            max-width: 90%; /* Prevent wide logos from touching edges */
            object-fit: contain; /* Ensure the image scales down nicely */
        }

        /* Modal Styles */
        .modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.6); backdrop-filter: blur(5px); z-index: 1000; display: none; }
        .confirmation-modal { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: white; padding: 2rem; border-radius: var(--border-radius); z-index: 1001; width: 90%; max-width: 400px; box-shadow: var(--shadow-md); text-align: center; display: none; }
        .order-details-list { list-style: none; padding: 0; margin-bottom: 2rem; text-align: left; }
        .order-details-list li { display: flex; justify-content: space-between; padding: 0.75rem 0; border-bottom: 1px solid #f1f3f5; font-size: 0.95rem; }
        .order-details-list li span:first-child { color: var(--text-secondary); }
        .modal-buttons { display: flex; gap: 1rem; }
        .btn-submit, .btn-secondary { flex: 1; padding: 0.85rem; border-radius: 8px; font-weight: 600; font-size: 1rem; cursor: pointer; transition: var(--transition); }
        .btn-submit { background: var(--danger); color: white; }
        .btn-submit:hover { background: var(--danger-hover); }
        .btn-secondary { background: #e9ecef; color: var(--text-secondary); }

        /* Footer Nav */
        .mobile-footer-nav {
            position: fixed; bottom: 0; left: 0; right: 0;
            max-width: 450px; margin: 0 auto;
            background: var(--light-card); display: flex;
            justify-content: space-around; padding: 0.5rem 0;
            box-shadow: 0 -2px 10px rgba(0,0,0,0.08);
            border-top: 1px solid #f1f3f5; z-index: 100;
        }
        .footer-link {
            display: flex; flex-direction: column; align-items: center;
            color: var(--text-secondary); text-decoration: none;
            font-size: 0.7rem; padding: 0.25rem 0.5rem; transition: color 0.2s;
        }
        .footer-link i { font-size: 1.2rem; margin-bottom: 4px; }
        .footer-link:hover, .footer-link.active { color: var(--primary); }