* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    font-size: 14px;
    line-height: 1.4;
    margin: 0;
    padding: 16px;
    background: #fafafa;
    color: #333;
}

p {
    margin: 0 0 12px 0;
}

textarea {
    max-width: 600px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 13px;
    background: #fff;
    resize: vertical;
}

input[type="button"] {
    padding: 6px 12px;
    margin: 2px 4px 2px 0;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.15s ease;
}

input[type="button"]:hover {
    background: #f5f5f5;
    border-color: #bbb;
}

input[type="button"]:active {
    background: #eee;
    transform: translateY(1px);
}

a {
    color: #0066cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

p.ASCII {
    float: left;
    padding: 0 12px;
    margin: 0;
    font-size: 14px;
    font-family: monospace;
}

.clear {
    clear: both;
    display: block;
    overflow: hidden;
    visibility: hidden;
    width: 0;
    height: 0;
}

#qrcode {
    margin: 12px 0;
    text-align: center;
}

#qrcode img {
    border: 1px solid #ddd;
    border-radius: 4px;
}

#ascii-table-container {
    margin: 16px 0;
    padding: 12px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    overflow-y: auto;
}

@media (max-width: 600px) {
    body {
        padding: 12px;
    }

    input[type="button"] {
        padding: 8px 10px;
        margin: 2px 2px 2px 0;
        font-size: 11px;
    }

    textarea {
        font-size: 12px;
    }
}