/* Modified from verbatim: Externalized from agent-ag/animejs-shuffle-demo/index.html */
:root {
    --bg-color: #0F0F11;
    --card-bg: #18181C;
    --text-color: #E4E4E7;
    --text-muted: #A1A1AA;
    --accent-violet: #8B5CF6;
    --border-color: #27272A;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    padding: 1.5rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}

.pane {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 
                0 0 30px rgba(139, 92, 246, 0.05);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.pane-header {
    margin-bottom: 1.25rem;
}

.pane-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.35rem;
    background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.pane-header p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.controls {
    margin-bottom: 1.25rem;
}

.btn {
    width: 100%;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.8rem 1.2rem;
    border-radius: 10px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
    outline: none;
}

.btn:hover {
    background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
    border-color: transparent;
    color: #FFFFFF;
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
}

.btn:active {
    transform: scale(0.98);
}

.layout-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    min-height: 250px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    padding: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    align-content: start;
}

.item {
    aspect-ratio: 1;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
    color: #FFFFFF;
    background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
    border: 1px solid rgba(167, 139, 250, 0.2);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.4), 
                0 0 10px rgba(124, 58, 237, 0.1);
    user-select: none;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    transition: transform 0.2s ease;
}

.item:hover {
    transform: scale(1.05);
}