* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    line-height: 1.6;
}

.top-offer {
    background: #000;
    color: #fff;
    text-align: center;
    padding: 10px;
    font-weight: bold;
    font-size: 14px;
}

.top-offer a {
    color: #ffd700;
    text-decoration: none;
}

header {
    background: #111;
    color: white;
    padding: 20px;
    text-align: center;
}

nav {
    margin-top: 15px;
}

nav a {
    color: white;
    margin: 8px 12px;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
}

section {
    padding: 30px 20px;
    background: white;
    margin: 20px auto;
    max-width: 1000px;
}

.cta-btn {
    display: inline-block;
    background: green;
    color: white;
    padding: 15px 25px;
    text-decoration: none;
    font-weight: bold;
    margin-top: 20px;
    border-radius: 5px;
}

footer {
    background: #111;
    color: white;
    text-align: center;
    padding: 20px;
}

.popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 15px;
}

.popup-content {
    background: white;
    padding: 20px;
    text-align: center;
    max-width: 500px;
    width: 100%;
    border-radius: 8px;
}

.popup-content img {
    width: 100%;
    height: auto;
}

.close-btn {
    cursor: pointer;
    color: red;
    font-weight: bold;
    float: right;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 20px;
    }
    nav a {
        display: block;
        margin: 10px 0;
    }
    section {
        margin: 10px;
        padding: 20px 15px;
    }
    .cta-btn {
        width: 100%;
        text-align: center;
    }
}