body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #007bff;
    color: white;
    text-align: center;
    padding: 20px;
}

header h1 {
    margin: 0;
    font-size: 2.5em;
}

header p {
    margin: 10px 0 0;
    font-size: 1.2em;
}

.ad-space {
    margin: 20px 0;
    padding: 10px;
    background-color: #e9ecef;
    border: 1px dashed #ccc;
    text-align: center;
    min-height: 90px; /* For banner ad */
}

#ad-space-bottom {
    min-height: 250px; /* For rectangle ad */
}

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.tool h2 {
    text-align: center;
    margin-bottom: 20px;
}

textarea {
    width: 100%;
    height: 200px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1em;
    resize: vertical;
}

.results {
    margin: 20px 0;
    font-size: 1.2em;
    text-align: center;
}

.results p {
    margin: 5px 0;
}

button {
    display: block;
    margin: 20px auto;
    padding: 12px 24px; /* Larger for mobile touch */
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1em;
}

button:hover {
    background-color: #218838;
}

#copyBtn {
    background-color: #17a2b8;  /* Different color for distinction */
}

#copyBtn:hover {
    background-color: #138496;
}

.about-tool {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
}

.about-tool h2, .about-tool h3 {
    color: #007bff;
}

.about-tool ul {
    list-style-type: disc;
    margin-left: 20px;
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #007bff;
    color: white;
    position: fixed;
    width: 100%;
    bottom: 0;
}

@media (max-width: 600px) {
    main {
        margin: 10px;
        padding: 10px;
    }
    header h1 {
        font-size: 2em;
    }
    button {
        padding: 15px 30px; /* Even larger for touch */
    }
    .ad-space {
        min-height: 60px; /* Smaller on mobile */
    }
    #ad-space-bottom {
        min-height: 200px;
    }
}