body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: #333;
    margin: 0;
    padding: 0;
    background-color: #f0f8ff;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 0 20px;
}

header {
    background: #4a90e2;
    color: #ffffff;
    padding-top: 30px;
    min-height: 70px;
    border-bottom: #2980b9 3px solid;
}

header a {
    color: #ffffff;
    text-decoration: none;
    font-size: 16px;
}

header li {
    display: inline;
    padding: 0 20px 0 20px;
}

header #branding {
    float: left;
}

header #branding h1 {
    margin: 0;
}

header nav {
    float: right;
    margin-top: 10px;
}

.highlight, .current a {
    color: #ffeb3b;
    font-weight: bold;
}

#showcase {
    min-height: 400px;
    background: url('/api/placeholder/1200/400') no-repeat center;
    background-size: cover;
    text-align: center;
    color: #ffffff;
}

#showcase h1 {
    margin-top: 100px;
    font-size: 55px;
    margin-bottom: 10px;
}

#showcase p {
    font-size: 20px;
}

button {
    font-size: 18px;
    background: #2ecc71;
    padding: 12px 28px;
    color: #ffffff;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #27ae60;
}

#features {
    margin-top: 20px;
}

.feature-box {
    float: left;
    text-align: center;
    width: 30%;
    padding: 10px;
}

.feature-box img {
    width: 100px;
}

#contact {
    clear: both;
    padding: 20px 0;
    text-align: center;
}

#contact input[type="email"] {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
}

#main-footer {
    background: #333;
    color: #ffffff;
    text-align: center;
    padding: 20px;
    margin-top: 20px;
}

@media(max-width: 768px) {
    header #branding,
    header nav,
    header nav li,
    .feature-box {
        float: none;
        text-align: center;
        width: 100%;
    }
    
    header {
        padding-bottom: 20px;
    }
    
    #showcase h1 {
        margin-top: 40px;
    }
}