/* Base styles */
        * {
            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;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* Header styles */
        header {
            background: linear-gradient(135deg, #1a2980, #26d0ce);
            color: white;
            padding: 20px 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 28px;
            font-weight: bold;
        }
        
        .logo span {
            color: #ffd700;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 25px;
        }
        
        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        
        nav ul li a:hover {
            color: #ffd700;
        }
        
        /* Banner ad styles */
        .banner-ad {
            margin: 20px auto;
            text-align: center;
            background-color: #f0f0f0;
            border: 1px dashed #ccc;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #666;
            font-weight: bold;
            overflow: hidden;
        }
        
        .banner-728x90 {
            width: 728px;
            height: 90px;
        }
        
        .banner-468x60 {
            width: 468px;
            height: 60px;
        }
        
        .banner-300x250 {
            width: 300px;
            height: 250px;
        }
        
        /* Ad iframe styling */
        .ad-iframe {
            border: none;
            display: block;
        }
        
        /* Ad placeholder styling */
        .ad-placeholder {
            width: 100%;
            height: 100%;
            display: flex;
            justify-content: center;
            align-items: center;
            background: linear-gradient(45deg, #f0f0f0, #e0e0e0);
            color: #888;
            font-size: 14px;
        }
        
        /* Main content styles */
        .hero {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1621761191319-c6fb62004040?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            text-align: center;
            padding: 50px 20px;
            margin-bottom: 10px;
        }
        
        .hero h1 {
            font-size: 48px;
            margin-bottom: 20px;
        }
        
        .hero p {
            font-size: 20px;
            max-width: 700px;
            margin: 0 auto 30px;
        }
        
        .btn {
            display: inline-block;
            background: #ffd700;
            color: #333;
            padding: 12px 30px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: bold;
            transition: background 0.3s;
        }
        
        .btn:hover {
            background: #ffed4a;
        }
        
        .content-section {
            display: flex;
            margin-bottom: 40px;
        }
        
        .main-content {
            flex: 3;
            padding-right: 30px;
        }
        
        .sidebar {
            flex: 1;
        }
        
        .card {
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 25px;
            margin-bottom: 25px;
        }
        
        .card h2 {
            color: #1a2980;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid #f0f0f0;
        }
        
        .crypto-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        
        .crypto-item {
            background: #f8f9fa;
            border-radius: 8px;
            padding: 15px;
            text-align: center;
            transition: transform 0.3s;
        }
        
        .crypto-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .crypto-icon {
            font-size: 30px;
            margin-bottom: 10px;
        }
        
        .price-up {
            color: #28a745;
        }
        
        .price-down {
            color: #dc3545;
        }
        
        .news-item {
            margin-bottom: 20px;
            padding-bottom: 20px;
            border-bottom: 1px solid #f0f0f0;
        }
        
        .news-item:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        
        .news-item h3 {
            color: #1a2980;
            margin-bottom: 10px;
        }
        
        .news-item p {
            margin-bottom: 10px;
            color: #666;
        }
        
        .news-item a {
            color: #26d0ce;
            text-decoration: none;
            font-weight: 500;
        }
        
        .news-item a:hover {
            text-decoration: underline;
        }
        
        /* Footer styles */
        footer {
            background: #1a2980;
            color: white;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        
        .footer-section {
            flex: 1;
            min-width: 250px;
            margin-bottom: 20px;
        }
        
        .footer-section h3 {
            margin-bottom: 20px;
            color: #ffd700;
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section ul li {
            margin-bottom: 10px;
        }
        
        .footer-section ul li a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-section ul li a:hover {
            color: #ffd700;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            margin-top: 20px;
            font-size: 14px;
            color: #aaa;
        }
        
        .copyright a {
            color: #ffd700;
            text-decoration: none;
        }
        
        .copyright a:hover {
            text-decoration: underline;
        }
        
        /* Responsive styles */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 15px;
                justify-content: center;
                flex-wrap: wrap;
            }
            
            nav ul li {
                margin: 5px 10px;
            }
            
            .content-section {
                flex-direction: column;
            }
            
            .main-content {
                padding-right: 0;
            }
            
            .banner-728x90, .banner-468x60 {
                width: 100%;
                max-width: 728px;
            }
            
            .banner-728x90 iframe,
            .banner-468x60 iframe,
            .banner-300x250 iframe {
                max-width: 100%;
                height: auto;
            }
            
            .hero h1 {
                font-size: 36px;
            }
            
            .hero p {
                font-size: 18px;
            }
        }