:root {
    --primary-color: #4a00e0;
    --secondary-color: #8e2de2;
    --background-color: #f0f0f0;
    --card-background: #ffffff;
    --text-color: #333;
    --glow-color: rgba(74, 0, 224, 0.4);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --font-family: 'Roboto', sans-serif;
    --background-gradient: linear-gradient(45deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

:root[data-theme='dark'] {
    --primary-color: #9d00e0;
    --secondary-color: #6a00e0;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #ffffff;
    --glow-color: rgba(157, 0, 224, 0.4);
    --shadow-color: rgba(255, 255, 255, 0.1);
    --background-gradient: linear-gradient(45deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    background-image: var(--background-gradient);
}

header, footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1rem 0;
}

main {
    padding: 2rem;
}

#upload-section, #gallery-section {
    background-color: var(--card-background);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 10px 20px var(--shadow-color);
}

#upload-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#upload-form input, #upload-form textarea {
    padding: 0.8rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#upload-form button {
    background-color: var(--primary-color);
    color: white;
    padding: 0.8rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
}

#upload-form button:hover {
    background-color: var(--secondary-color);
    box-shadow: 0 0 15px var(--glow-color);
}

#gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

artwork-card {
    background-color: var(--card-background);
    border-radius: 8px;
    box-shadow: 0 10px 20px var(--shadow-color);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

artwork-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}