body {
    font-family: Arial, sans-serif;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
    transition: background-color 0.3s ease, color 0.3s ease; /* Smooth transition */
    background-color: #222;  /* DARK THEME DEFAULT - set dark theme colors here */
    color: #eee;
}
h1 {
    color: #fff; /* DARK THEME DEFAULT */
}
.signature-container {
    margin: 20px 0;
    width: 100%;
}
canvas {
    border: 1px solid #555;  /* DARK THEME DEFAULT */
    background-color: #333; /* DARK THEME DEFAULT */
    touch-action: none;
    width: 100%;
    height: auto;
    max-height: 200px;
}
.button-group {
    margin: 20px 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}
button {
    padding: 10px 15px;
    margin: 5px;
    background-color: #8c52ff;
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s ease; /* Smooth transition for buttons */
}
button:hover {
    background-color: #7a47e6;
}
button.clear {
    background-color: #f44336;
}
button.clear:hover {
    background-color: #d32f2f;
}
.output {
    margin-top: 20px;
}
#signatureImage {
    max-width: 100%;
    border: 1px solid #ddd;
    margin-top: 10px;
}
.tnc-container {
    margin-top: 40px;
    padding: 20px;
    background-color: #444; /* DARK THEME DEFAULT */
    border-top: 1px solid #666; /* DARK THEME DEFAULT */
    text-align: left;
    font-size: 0.9em;
    color: #bbb; /* DARK THEME DEFAULT */
}
.tnc-container h2 {
    color: #ddd; /* DARK THEME DEFAULT */
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.2em;
}
.tnc-container ul {
    padding-left: 20px;
    margin-bottom: 15px;
}
.tnc-container li {
    margin-bottom: 5px;
}
.tnc-container small {
    color: #999; /* DARK THEME DEFAULT */
}
#theme-toggle {
    position: fixed; /* Fix the button to a corner */
    top: 10px;
    right: 10px;
    background-color: #8c52ff;
    color: white;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    z-index: 1000; /* Ensure it's above other elements */
    transition: background-color 0.2s ease;
}
#theme-toggle:hover {
    background-color: #7a47e6;
}
.logo {
    display: block;
    width: 80%;
    max-width: 300px;
    height: auto;
    margin: 15px auto;
}
@media (max-width: 600px) {
    body {
        padding: 10px;
    }
    h1 {
        font-size: 1.5em;
    }
    button {
        padding: 8px 12px;
        font-size: 14px;
    }
    .signature-container {
        margin: 15px 0;
    }
    canvas {
        max-height: 150px;
    }
    .tnc-container {
        padding: 15px;
        font-size: 0.85em;
    }
    .tnc-container h2 {
        font-size: 1.1em;
    }
    .tnc-container ul {
        padding-left: 15px;
    }
    .logo {
        max-width: 200px;
    }
}
@media (min-width: 601px) and (max-width: 900px) {
    h1 {
        font-size: 2em;
    }
    button {
        font-size: 18px;
    }
}

/* --- Light Theme Styles --- */
body[data-theme="light"] {
    background-color: #f9f9f9;
    color: #333;
}
body[data-theme="light"] h1 {
    color: #333;
}
body[data-theme="light"] canvas {
    border: 1px solid #ccc;
    background-color: #fff;
}
body[data-theme="light"] .tnc-container {
    background-color: #eee;
    border-top: 1px solid #ddd;
    color: #555;
}
body[data-theme="light"] .tnc-container h2 {
    color: #333;
}
body[data-theme="light"] .tnc-container small{
    color: #777;
}