:root {
    --bg-color: #f0f0f0;
    --text-color: #333;
    --header-bg: #333;
    --header-text: white;
    --container-bg: white;
    --border-radius: 8px;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --header-bg: #000;
    --header-text: #fff;
    --container-bg: #2d2d2d;
}

body {
    font-family: sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem;
    text-align: center;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    margin: 0;
}

#theme-toggle {
    padding: 0.5rem 1rem;
    cursor: pointer;
    border-radius: 4px;
    border: 1px solid var(--header-text);
    background: transparent;
    color: var(--header-text);
}

main {
    padding: 1rem;
}

.controls {
    margin-bottom: 1rem;
}

.content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

#image-container,
#pattern-container {
    background-color: var(--container-bg);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

img {
    max-width: 100%;
    height: auto;
}

#pattern {
    display: grid;
    grid-template-columns: repeat(32, 1fr);
    gap: 1px;
}

.pattern-cell {
    aspect-ratio: 1/1;
}

@media (max-width: 768px) {
    .content {
        grid-template-columns: 1fr;
    }
}