:root {
    --bg-color: #1a1a1a;
    --panel-color: #2c2c2c;
    --text-color: #e0e0e0;
    --accent-color: #4a90e2;
    --input-bg: #3d3d3d;
    --dark-bg: #300020;
    --light-bg: #ffe7f7;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Verdana, sans-serif;
    overflow: hidden;
    display: flex;
    height: 100vh;
}

#sidebar {
    width: 280px;
    flex-shrink: 0; /* Prevent shrinking */
    background-color: var(--panel-color);
    padding: 20px;
    box-shadow: 2px 0 5px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
    z-index: 10;
}

.top-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 2px;
}

/* Dropdown Styles */
.dropdown {
    position: relative;
}

.dropdown-btn {
    margin-top: 0;
    height: 100%;
    font-size: 0.85rem;
    background-color: #333;
    color: #e0e0e0;
    border: 1px solid #444;
    border-radius: 4px;
    transition: all 0.2s ease;
    font-weight: 500;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
    width: 100%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.dropdown-btn:hover {
    background-color: #3e3e3e;
    border-color: #666;
    color: white;
}

.dropdown-btn:active {
    background-color: #2a2a2a;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--panel-color);
    border: 1px solid #555;
    border-radius: 4px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    z-index: 1000;
    margin-top: 2px;
    overflow: hidden;
}

.dropdown-content.show {
    display: block;
}

.dropdown-item {
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--text-color);
    transition: background-color 0.2s ease;
    border-bottom: 1px solid #444;
}

.dropdown-item:last-child {
    border-bottom: none;
}

.dropdown-item:hover {
    background-color: #3e3e3e;
    color: white;
}

.dropdown-divider {
    height: 1px;
    background-color: #555;
    margin: 2px 0;
}

.top-buttons button {
    margin-top: 0;
    height: 100%;
    font-size: 0.85rem;
    background-color: #333;
    color: #e0e0e0;
    border: 1px solid #444;
    border-radius: 4px;
    transition: all 0.2s ease;
    font-weight: 500;
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.top-buttons button:hover {
    background-color: #3e3e3e;
    border-color: #666;
    color: white;
}

.top-buttons button:active {
    background-color: #2a2a2a;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

/* Floating Labels (Canvas) */
.node-label {
    position: absolute;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: monospace;
    font-size: 12px;
    pointer-events: none;
    color: black;
    font-weight: bold;
    transform: translate(-50%, 0); /* Center horizontally */
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(0,0,0,0.4);
    z-index: 5;
}

/* Node Label Colors */
.label-deep { background: rgba(46, 204, 113, 0.6); border: 2px solid #2ecc71; }
.label-max { background: rgba(209, 88, 88, 0.6); border: 2px solid #d15858; }
.label-min { background: rgba(241, 196, 15, 0.6); border: 2px solid #f1c40f; }
.label-target { background: rgba(79, 172, 250, 0.6); border: 2px solid #4facfa; }
.label-root { background: rgba(155, 89, 182, 0.6); border: 2px solid #9b59b6; }
.label-start { background: rgba(255, 165, 0, 0.6); border: 2px solid #ff8c00; }

.panel-section {
    margin-bottom: 1px;
    margin-top: 0px;
}

.panel-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 13px; /* Reduced horizontal gap */
    align-items: center;
}

.control-col {
    /* margin: 100px; */
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0px;
    margin-top: 6px;
}

#renderBtn {
    background-color: #204d1f;
}

input[type="number"], input[type="text"], select {
    background-color: var(--input-bg);
    border: 1px solid #555;
    color: white;
    padding: 4px 6px; /* Smaller padding */
    border-radius: 3px;
    font-size: 0.9rem;
    width: 100%;
    box-sizing: border-box; /* Ensure padding doesn't add to width */
    cursor: pointer;
    transition: all 0.2s ease;
}

/* Remove Safari's glossy styling on select elements */
select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4H4z' fill='%23aaa'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
    background-size: 12px;
    padding-right: 24px; /* Space for dropdown arrow */
}

select:hover {
    background-color: #3e3e3e;
    border-color: #666;
    color: white;
}

select:active, select:focus {
    background-color: #2a2a2a;
    border-color: var(--accent-color);
    outline: none;
    box-shadow: 0 0 3px rgba(74, 144, 226, 0.3);
}

/* Specifically target the small inputs in the grid */
.panel-grid input[type="number"] {
    width: 100%;
}

.control-group.horizontal {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}

/* Rotary Knob Styles */
.knob-wrapper {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 5px;
    user-select: none;
}

.knob {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: linear-gradient(145deg, #3a3a3a, #252525);
    border: 2px solid #555;
    position: relative;
    cursor: ns-resize;
    box-shadow: 3px 3px 6px rgba(0,0,0,0.3), -1px -1px 2px rgba(255,255,255,0.05);
    transition: border-color 0.2s;
}

.knob:hover {
    border-color: var(--accent-color);
}

.knob:active {
    cursor: grabbing;
}

.knob-indicator {
    position: absolute;
    top: 10%;
    left: 50%;
    width: 2px;
    height: 40%;
    background: var(--accent-color);
    transform-origin: bottom center;
    transform: translateX(-50%); 
    pointer-events: none;
    box-shadow: 0 0 2px var(--accent-color);
}

/* Dot in the center for aesthetics */
.knob::after {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 6px; height: 6px;
    background: #777;
    border-radius: 50%;
    box-shadow: inset 1px 1px 2px rgba(0,0,0,0.5);
}

.knob-value {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--accent-color);
    cursor: text;
}
.knob-value:hover {
    text-decoration: underline;
}

/* Hide old range slider styles if any remain */
input[type="range"].hidden-slider {
    display: none;
}

label { font-size: 0.7rem; letter-spacing: 0.5px; color: #aaa; margin-bottom: 2px; }

#canvas-container {
    flex-grow: 1;
    /* width: 0;  Removed: flex-grow handles it, but let's ensure it can shrink if needed */
    min-width: 0; /* Crucial for flex items to shrink properly */
    position: relative;
    overflow: hidden;
    cursor: grab;
    background-color: #111; /* Slightly darker background for contrast */
}


#loading {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 20px;
    border-radius: 8px;
    display: none;
}

.legend-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    align-items: start;
}

.legend-buttons {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.legend {
    font-size: 0.75rem;
    color: #aaa;
}
.legend-item { display: flex; align-items: center; gap: 5px; margin-bottom: 2px; }
.box { width: 10px; height: 10px; display: inline-block; }

.legend-btn {
    padding: 4px 8px;
    font-size: 0.75rem;
    background-color: #333;
    color: #e0e0e0;
    border: 1px solid #555;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    width: 100%;
}

.legend-btn:hover {
    background-color: #3e3e3e;
    border-color: #666;
    color: white;
}

.legend-btn:active {
    background-color: #2a2a2a;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
    transform: translateY(1px);
}

.legend-btn.help-link {
    /* padding: 3px; */
    font-size:larger;
    text-decoration: none;
    text-align: center;
    margin: 10px;
    width: auto;
    display: inline-block;
    color: #e0e0e0;
}

.legend-btn.help-link:hover {
    color: white;
}

/* Toggle Switch Styles */
.toggle-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #555;
    transition: .4s;
    border-radius: 20px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

.toggle-label {
    font-size: 0.7rem;
    color: #aaa;
    letter-spacing: 0.5px;
}

#tooltip {
    position: absolute;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 12px;
    pointer-events: none;
    display: none;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0,0,0,0.5);
    white-space: nowrap;
    border: 1px solid #555;
}