:root {
    --primary: #2196F3;
    --primary-dark: #1976D2;
    --background: #000000;
    --surface: #121212;
    --surface-variant: #1E1E1E;
    --text: #FFFFFF;
    --text-muted: #B0B0B0;
}
body {
    background-color: var(--background);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 20px;
}
.container { max-width: 800px; margin: auto; }
.card { background: var(--surface); border-radius: 16px; padding: 20px; margin-bottom: 20px; }
input, select, button { 
    background: var(--surface-variant); color: var(--text); 
    border: 1px solid var(--surface-variant); border-radius: 8px; padding: 10px; width: 100%; box-sizing: border-box; margin-bottom: 10px; 
}
button { background: var(--primary); font-weight: bold; cursor: pointer; border: none; }
button:hover { background: var(--primary-dark); }
.button-item { background: var(--surface-variant); padding: 10px; border-radius: 8px; margin-top: 10px; display: flex; justify-content: space-between; align-items: center;}
.delete-btn { background: #d32f2f; width: auto; margin:0; padding: 5px 10px;}
.buttonset-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 15px;}
h1, h2, h3, h4 { margin-top: 0; }

.gallery-img {
    width: 60px;
    height: 60px;
    cursor: pointer;
    border: 3px solid transparent;
    border-radius: 12px;
    padding: 5px;
    background: var(--surface-variant);
    flex-shrink: 0;
    transition: all 0.2s ease;
    object-fit: cover;
}
.gallery-img:hover {
    transform: scale(1.05);
    background: #2a2a2a;
}
.gallery-img.selected {
    border-color: var(--primary);
    background: rgba(33, 150, 243, 0.2);
    box-shadow: 0 0 15px rgba(33, 150, 243, 0.5);
    transform: scale(1.1);
}