* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #ff5722;
}

.search-bar {
    display: flex;
    flex: 1;
    max-width: 400px;
    margin: 0 20px;
}

.search-bar input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
}

.search-bar button {
    padding: 10px 15px;
    background-color: #ff5722;
    color: #fff;
    border: none;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

nav ul {
    list-style: none;
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: #333;
    text-decoration: none;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: #ff5722;
}

.hero {
    background: linear-gradient(135deg, #ff5722, #ff9800);
    color: #fff;
    text-align: center;
    padding: 80px 20px;
}

.banner h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.banner p {
    font-size: 20px;
    margin-bottom: 20px;
}

.promo-highlight {
    background-color: rgba(255, 255, 255, 0.2);
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 30px;
    font-weight: bold;
}

.btn-primary {
    background-color: #fff;
    color: #ff5722;
    border: none;
    padding: 15px 30px;
    font-size: 18px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover {
    background-color: #f5f5f5;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.products {
    padding: 60px 20px;
    background-color: #fff;
}

.products h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.product-card {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: box-shadow 0.3s;
}

.product-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.product-image {
    font-size: 48px;
    margin-bottom: 10px;
}

.product-card h3 {
    margin-bottom: 10px;
    color: #333;
}

.product-card p {
    color: #ff5722;
    font-weight: bold;
    margin-bottom: 15px;
}

.btn-secondary {
    background-color: #ff5722;
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-secondary:hover {
    background-color: #e64a19;
}

.promo {
    padding: 60px 20px;
    background-color: #f9f9f9;
}

.promo h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

.promo-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.promo-card {
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: box-shadow 0.3s;
}

.promo-card:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.promo-card h3 {
    margin-bottom: 10px;
    color: #ff5722;
}

.checkout {
    padding: 60px 20px;
    background-color: #fff;
}

.checkout h2 {
    text-align: center;
    margin-bottom: 40px;
    color: #333;
}

#topup-form {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#topup-form input,
#topup-form select {
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 40px 20px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
}

.footer-links div {
    flex: 1;
}

.footer-links h4 {
    margin-bottom: 10px;
    color: #ff5722;
}

@media (max-width: 768px) {
    .product-grid, .promo-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    header .container {
        flex-direction: column;
        gap: 10px;
    }
    .search-bar {
        max-width: none;
        margin: 0;
    }
    .footer-links {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .product-grid, .promo-cards {
        grid-template-columns: 1fr;
    }
    .hero h1 {
        font-size: 32px;
    }
}