:root {
    --bg-color: #0d1117;
    --panel-bg: #161b22;
    --queue-color: #d29922; /* Orange */
    --ll-color: #2f81f7;    /* Blue */
    --stack-color: #238636; /* Green */
    --text-color: #c9d1d9;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Courier New', Courier, monospace;
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

h1 { margin: 0; letter-spacing: -1px; }
.highlight { color: var(--ll-color); }

.dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    width: 100%;
    max-width: 1200px;
    margin-top: 30px;
}

.panel {
    background: var(--panel-bg);
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 15px;
    display: flex;
    flex-direction: column;
}

.panel h2 {
    font-size: 1rem;
    border-bottom: 1px solid #30363d;
    padding-bottom: 10px;
    margin-top: 0;
}

.visual-container {
    flex-grow: 1;
    background: #000;
    border-radius: 6px;
    min-height: 200px;
    padding: 10px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    overflow-x: auto;
    border: 1px solid #30363d;
}

/* Specific Layouts */
.stack-view {
    flex-direction: column-reverse; /* Items pile up from bottom */
    justify-content: flex-start;
    align-items: center;
}

/* Data Items */
.data-block {
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    font-weight: bold;
    color: #fff;
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    flex-shrink: 0;
    position: relative;
    box-shadow: 0 4px 6px rgba(0,0,0,0.5);
}

.queue-item { background: var(--queue-color); }
.ll-item { background: var(--ll-color); border-radius: 50%; } /* Circles for Nodes */
.stack-item { background: var(--stack-color); width: 80%; height: 40px; }

/* Arrows for Linked List */
.ll-arrow { color: #555; font-size: 20px; }

/* Controls */
.controls { display: flex; flex-direction: column; gap: 10px; }
.input-group { display: flex; gap: 5px; }

button {
    background: #21262d;
    border: 1px solid #30363d;
    color: var(--text-color);
    padding: 8px;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.2s;
    font-family: inherit;
}
button:hover { background: #30363d; }
button:active { transform: translateY(2px); }
.accent { background: var(--ll-color); color: white; border: none; }
.danger { color: #f85149; border-color: #f85149; }

#log-console {
    width: 100%;
    max-width: 1200px;
    background: #000;
    color: #0f0;
    padding: 10px;
    margin-top: 20px;
    border-radius: 5px;
    font-size: 0.9rem;
    border: 1px solid #30363d;
}

@keyframes popIn {
    from { transform: scale(0); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}