:root {
    /* COLOR SYSTEM - Professional Dark Theme */
    --bg-darkest: #0f0f1b;       /* Deep background */
    --bg-dark: #1a1a2e;          /* Primary surface */
    --bg-medium: #16213e;        /* Secondary surface */
    --bg-light: #1e293b;         /* Tertiary surface */

    /* ACCENT COLORS - Cyberpunk/Terminal Inspired */
    --accent-primary: #00ff41;   /* Terminal Green */
    --accent-secondary: #ff006e; /* Neon Pink */
    --accent-tertiary: #00d9ff;  /* Cyan */

    /* TEXT & BORDERS */
    --text-primary: #e0e7ff;     /* Primary text */
    --text-secondary: #94a3b8;   /* Secondary text */
    --border-color: #2d3748;     /* Border color */

    /* LAYOUT DIMENSIONS */
    --header-height: 48px;
    --icon-rail-width: 48px;
    --tools-width: 320px;
    --side-panel-width: 350px;
    --border-glow: rgba(0, 255, 65, 0.3);

    /* TILE SYSTEM */
    --tile-dim: 32;
    --pixel-size: 16px;
    --canvas-size: 512px;
}




/* Base Styles */
body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', 'Inter', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    overflow: hidden;
    background-color: var(--bg-darkest);
    color: var(--text-primary);
}

#container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

#scene-container {
    flex: 1;
    position: relative;
    background-color: var(--bg-medium);
    border-right: 1px solid var(--border-color);
}

#sidebar {
    width: 350px;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    padding: 15px;
    overflow-y: auto;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.5);
    border-left: 1px solid var(--border-glow);

    display: flex;
    flex-direction: column;
}

/* Info Display */
#info {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: rgba(10, 10, 27, 0.8);
    color: var(--accent-primary);
    padding: 8px 12px;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    border: 1px solid var(--border-glow);
    z-index: 1000;
}

/* Button Styles */
button {
    background-color: var(--bg-medium);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    margin: 5px 0;
    cursor: pointer;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 4px;
    transition: all 0.2s ease;
    font-weight: 500;
}

button:hover {
    background-color: var(--bg-light);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

button:active {
    background-color: var(--accent-primary);
    color: var(--bg-darkest);
    transform: translateY(1px);
}

.icon-button {
    width: auto;
    padding: 4px;
    min-width: 20px;
    background-color: var(--bg-medium);
    border: 1px solid var(--border-color);
}

.icon-button:hover {
    background-color: var(--bg-light);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

/* Layer Item Styles - Professional and Cool */
.layer-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    padding: 4px 6px;
    background-color: var(--bg-medium);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    cursor: default;
}

.layer-item:hover {
    background-color: var(--bg-light);
    border-color: var(--accent-primary);
    box-shadow: 0 0 5px var(--border-glow);
}

.layer-item input[type="text"] {
    flex: 1;
    margin-bottom: 0;
    min-width: 120px;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 6px 10px;
    border-radius: 4px;
}

.layer-item input[type="text"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 3px var(--accent-primary);
}

.layer-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-primary);
}

/* Control Group Styles */
.control-group {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-tertiary);
    font-weight: 600;
    flex: 1;
}

.panel-title h3 {
    margin: 0;
    font-size: 12px;
    font-weight: 600;
}


.panel-actions {
    display: flex;
    gap: 5px;
}

.panel-content {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

/* Button Group Styles */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.button-group button {
    flex: 1;
    min-width: 40px;
}

/* Toggle Button Styles */
.toggle-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0 5px;
    font-size: 12px;
    width: auto;
    min-width: auto;
    transition: all 0.2s ease;
}

.toggle-btn:hover {
    color: var(--accent-primary);
    transform: scale(1.1);
}

.toggle-btn.minimized i::before {
    content: "+";
}

/* Input and Select Styles */
input,
select {
    width: 100%;
    padding: 4px 4px;
    margin-bottom: 10px;
    box-sizing: border-box;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 4px;
    font-family: inherit;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 3px var(--accent-primary);
}

/* Label Styles */
label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
}

/* Layer Controls Enhancement */
#layers-list {
    margin: 10px 0;
}

/* Up/Down Button Styles */
.layer-item .icon-button {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.layer-item .icon-button:hover {
    background-color: var(--accent-primary);
    color: var(--bg-darkest);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
}

.layer-item .icon-button:active {
    transform: translateY(0);
}

/* Delete Button Style */
.layer-item .icon-button:last-child {
    color: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

/* Sidebar Header Styles */
.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-glow);
}

.sidebar-header h2 {
    color: var(--accent-primary);
    font-size: 18px;
    margin: 0;
    font-weight: 700;
}

.global-actions {
    display: flex;
    gap: 6px;
}

.global-actions .icon-button {
    background-color: var(--bg-medium);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.global-actions .icon-button:hover {
    background-color: var(--accent-primary);
    color: var(--bg-darkest);
    border-color: var(--accent-primary);
    transform: scale(1.1);
}

/* Panel Section Styles */
.panel-section {
    margin-bottom: 15px;
    padding: 12px;
    background-color: var(--bg-medium);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

/* Active Panel Highlight */
.panel-section.active {
    border-color: var(--accent-primary);
    box-shadow: 0 0 8px var(--border-glow);
}
/* Vertical Tab System */
.tab-rail {
    width: var(--tab-width);
    background-color: var(--bg-darkest);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 0;
    position: relative;
    z-index: 10;
}

.tab-button {
    width: 32px;
    height: 32px;
    background-color: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    margin: 5px 0;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s ease;
    position: relative;
}

.tab-button:hover {
    background-color: var(--bg-medium);
    color: var(--accent-primary);
}

.tab-button.active {
    background-color: var(--accent-primary);
    color: var(--bg-darkest);
}

.tab-button.active::before {
    content: '';
    position: absolute;
    right: -4px;
    top: 50%;
    transform: translateY(-50%);
    width: var(--tab-active-width);
    height: 20px;
    background-color: var(--accent-primary);
    border-radius: 0 2px 2px 0;
}

.tab-button i {
    font-size: 16px;
}

/* Panel Container with Tabs */
.panel-container {
    display: flex;
    flex: 1;
    min-height: 0;
}

.panel-content-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 0 10px;
}



/* Panel Header with Right-Aligned Controls */
.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-right: 10px;
}

.panel-actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}

/* Minimize/Maximize Button Alignment */
.toggle-btn {
    background: var(--bg-medium);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 12px;
    width: auto;
    min-width: auto;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.toggle-btn:hover {
    background: var(--bg-light);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.toggle-btn.minimized {
    transform: rotate(180deg);
}

/* Individual Panel Styling */
.control-group {
    margin-bottom: 15px;
    padding: 12px;
    background-color: var(--bg-medium);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.control-group.hidden {
    display: none;
}


/* Layer Panel Specific Styles */
#layers-panel {
    margin-top: auto;
}

/* Responsive Tab System */
@media (max-width: 768px) {
    .tab-rail {
        width: 36px;
    }

    .tab-button {
        width: 28px;
        height: 28px;
    }

    #sidebar {
        width: 300px;
    }
}
.layer-item .icon-button:last-child:hover {
    background-color: var(--accent-secondary);
    color: var(--bg-darkest);
}

/* Scrollbar Styling */
#sidebar::-webkit-scrollbar {
    width: 8px;
}

#sidebar::-webkit-scrollbar-track {
    background: var(--bg-darkest);
    border-radius: 4px;
}

#sidebar::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

#sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* Animation for Layer Movement */
@keyframes layerMove {
    0% { transform: translateX(0); opacity: 1; }
    50% { transform: translateX(5px); opacity: 0.8; }
    100% { transform: translateX(0); opacity: 1; }
}

.layer-item {
    animation: layerMove 0.3s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    #sidebar {
        width: 300px;
    }

    button {
        padding: 6px 10px;
        font-size: 13px;
    }
}

/* Font Awesome Integration */
.fa, .fas {
    font-size: 14px;
    color: inherit;
}

/* Layer Item Specific Icons */
.layer-item .fa-arrow-up {
    color: var(--accent-tertiary);
}

.layer-item .fa-arrow-down {
    color: var(--accent-tertiary);
}

.layer-item .fa-trash {
    color: var(--accent-secondary);
}

.layer-item .fa-eye, .layer-item .fa-eye-slash {
    color: var(--accent-primary);
}

/* Visibility Toggle Customization */
.layer-item input[type="checkbox"]:checked {
    accent-color: var(--accent-primary);
}

/* Professional Layer Header */
.control-group h2 {
    color: var(--accent-primary);
    font-size: 20px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-glow);
    font-weight: 700;
}

/* Add Layer Button Enhancement */
#add-layer {
    background-color: var(--accent-primary);
    color: var(--bg-darkest);
    font-weight: 600;
    margin: 10px 0;
    border: none;
}

#add-layer:hover {
    background-color: var(--accent-tertiary);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--border-glow);
}

/* Current Layer Dropdown */
#current-layer {
    background-color: var(--bg-dark);
    border: 1px solid var(--accent-primary);
    color: var(--text-primary);
    padding: 8px;
    border-radius: 4px;
    margin-top: 10px;
}

/* Layer Name Input Focus */
.layer-item input[type="text"]:focus {
    border-color: var(--accent-tertiary);
    box-shadow: 0 0 5px var(--accent-tertiary);
}