:root {
    --bg-app: #0f1012;
    --bg-sidebar: #1b1d21;
    --border-color: #333;
    --accent: #10b981; /* Construct 3 Greenish */
    --accent-glow: rgba(16, 185, 129, 0.4);
    --input-bg: #25282e;
    --text-main: #e0e0e0;
}

body {
    background-color: var(--bg-app);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    height: 100vh;
    overflow: hidden;
}

.bg-sidebar { background-color: var(--bg-sidebar); }
.bg-dark-soft { background-color: #151515; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-app); }
::-webkit-scrollbar-thumb { background: #444; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* List Group */
.list-group-item {
    background-color: transparent;
    border-color: var(--border-color);
    color: #aaa;
    cursor: pointer;
    font-size: 0.9rem;
    transition: 0.2s;
    border-left: 3px solid transparent;
}
.list-group-item:hover {
    background-color: rgba(255,255,255,0.05);
    color: #fff;
}
.list-group-item.active {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: transparent;
    border-left-color: var(--accent);
    color: var(--accent);
    font-weight: 600;
}

/* Search Input */
.form-control-dark {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: #fff;
}
.form-control-dark:focus {
    background-color: #2a2e35;
    border-color: var(--accent);
    box-shadow: none;
    color: #fff;
}

/* Visualization Card */
.viz-card {
    background: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 800px;
}

.canvas-wrapper {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    background: #111;
    border-radius: 8px;
    border: 1px solid #333;
    overflow: hidden;
}

/* Animation Track */
.mw-800 { max-width: 800px; }
.mw-600 { max-width: 600px; }

.anim-track {
    height: 40px;
    background: #1a1a1a;
    border-radius: 20px;
    border: 1px solid #333;
    position: relative;
    margin-top: 5px;
}

.anim-ball {
    width: 32px;
    height: 32px;
    background: var(--accent);
    border-radius: 50%;
    position: absolute;
    top: 3px;
    left: 3px; /* Will be animated */
    box-shadow: 0 0 15px var(--accent-glow);
}