/* --- Global Styles & Variables --- */
:root {
    --bg-color: #f4f7f9;
    --card-bg: #ffffff;
    --text-color: #333;
    --label-color: #555;
    --primary-color: #007bff;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.07);
    --code-bg: #2d2d2d;
    --code-color: #f2f2f2;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
}

/* --- Layout --- */
.page-wrapper {
    display: grid;
    grid-template-columns: 350px 1fr;
    min-height: 100vh;
}

.controls {
    background-color: var(--card-bg);
    padding: 2rem;
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
}

.output {
    padding: 2rem 3rem;
    overflow-y: auto;
}

/* --- Typography & Headers --- */
header {
    margin-bottom: 2rem;
    text-align: center;
}

header h1 {
    font-size: 1.75rem;
    margin: 0 0 0.5rem 0;
    color: var(--primary-color);
}

header p {
    font-size: 0.9rem;
    color: var(--label-color);
    margin: 0;
}

h2 {
    font-size: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}
h2:first-of-type {
    margin-top: 0;
}

/* --- Control Panel Styling --- */
.control-group {
    margin-bottom: 1.5rem;
}

.control-group label {
    display: block;
    font-weight: bold;
    color: var(--label-color);
    margin-bottom: 0.5rem;
}

input[type="text"],
select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    box-sizing: border-box;
}

input[type="range"] {
    width: 100%;
}

.color-control-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
}
input[type="color"] {
    width: 50px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}
input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}
input[type="color"]:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.transparent-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.transparent-option label {
    margin-bottom: 0;
    font-weight: normal;
    color: var(--text-color);
}


/* --- Output & Preview Styling --- */
#preview-area {
    background-color: var(--card-bg);
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 250px;
    transition: background-color 0.3s ease;
}

.code-container {
    margin-top: 3rem;
}

.code-box {
    position: relative;
    background-color: var(--code-bg);
    border-radius: 8px;
    margin-top: 1rem;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s ease;
}

.copy-btn:hover {
    background-color: #0056b3;
}

pre {
    padding: 2rem 1rem 1rem 1rem;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-all;
}

code {
    font-family: 'Source Code Pro', monospace;
    color: var(--code-color);
    font-size: 0.85rem;
}

/* --- Responsive Design --- */
@media (max-width: 900px) {
    .page-wrapper {
        grid-template-columns: 1fr;
    }
    .controls {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .output {
        padding: 2rem;
    }
}