:root {
    --bg-color: #0f0f13;
    --sidebar-bg: #18181b;
    --sidebar-border: #27272a;
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --accent-color: #6366f1;
    /* Indigo */
    --accent-hover: #818cf8;
    --grid-color: #27272a;
    --component-bg: #27272a;
    --component-border: #3f3f46;
    --pin-color: #71717a;
    --pin-hover: #e4e4e7;
    --wire-off: #52525b;
    --wire-on: #ef4444;
    /* Red for power */
    --led-off: #450a0a;
    --led-on: #ef4444;
    --success-color: #10b981;
    --danger-color: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    /* Prevent text selection while dragging */
}

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

.app-layout {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Menu Bar (smaller bar above top bar) */
.menu-bar {
    height: 19px;
    background-color: #0f0f13;
    border-bottom: 1px solid var(--sidebar-border);
    display: flex;
    align-items: center;
    padding: 0 0.75rem;
    z-index: 21;
}

.menu-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.15s;
    border-radius: 4px;
}

.menu-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.08);
}

/* Top Bar */
.top-bar {
    height: 60px;
    background-color: var(--sidebar-bg);
    border-bottom: 1px solid var(--sidebar-border);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    gap: 2rem;
    z-index: 20;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.logo h2 {
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    margin: 0;
    font-size: 1.25rem;
}

.toolbar {
    display: flex;
    gap: 1rem;
    padding: 0;
    /* Override previous toolbar padding */
    background: none;
    /* Override previous toolbar bg */
    backdrop-filter: none;
    /* Override previous toolbar blur */
}

.top-bar-right {
    margin-left: auto;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: none;
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.btn-icon:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--sidebar-bg);
    border: 1px solid var(--sidebar-border);
    border-radius: 8px;
    min-width: 180px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: background-color 0.15s;
}

.dropdown-item:first-child {
    border-radius: 7px 7px 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 7px 7px;
}

.dropdown-item:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

.dropdown-item svg {
    flex-shrink: 0;
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background-color: var(--sidebar-bg);
    border: 1px solid var(--sidebar-border);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    max-width: 350px;
    animation: slideIn 0.3s ease;
}

.toast.warning {
    border-left: 4px solid #f59e0b;
}

.toast.error {
    border-left: 4px solid #ef4444;
}

.toast.success {
    border-left: 4px solid #10b981;
}

.toast-icon {
    flex-shrink: 0;
}

.toast.warning .toast-icon {
    color: #f59e0b;
}

.toast.error .toast-icon {
    color: #ef4444;
}

.toast.success .toast-icon {
    color: #10b981;
}

.toast-message {
    color: var(--text-primary);
    font-size: 0.9rem;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Main Content Wrapper */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar (Now inside main-content) */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    display: flex;
    flex-direction: column;
    padding: 1rem;
    z-index: 10;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.2);
}

.components-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    padding-right: 0.5rem;
    /* for scrollbar spacing */
}

/* Custom Scrollbar for sidebar */
.components-list::-webkit-scrollbar {
    width: 6px;
}

.components-list::-webkit-scrollbar-track {
    background: transparent;
}

.components-list::-webkit-scrollbar-thumb {
    background-color: var(--component-border);
    border-radius: 3px;
}

.components-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}

.component-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--sidebar-border);
    border-radius: 8px;
    cursor: grab;
    transition: all 0.2s ease;
}

.component-item:hover {
    background-color: rgba(255, 255, 255, 0.06);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.component-item.selected {
    border-color: var(--accent-color);
    background-color: rgba(99, 102, 241, 0.1);
}

.component-item:active {
    cursor: grabbing;
}

.category-header {
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.5rem 0.5rem 0.25rem;
    margin-top: 0.5rem;
    border-top: 1px solid var(--sidebar-border);
}

.category-header:first-child {
    border-top: none;
    margin-top: 0;
}

.icon {
    width: 24px;
    height: 24px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

/* Placeholder icons */
.switch-icon {
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><rect x="4" y="4" width="16" height="16" rx="2"/></svg>');
}

.led-icon {
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2"><circle cx="12" cy="12" r="6"/></svg>');
}

.instructions {
    margin-top: auto;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.4;
    padding-top: 1rem;
    border-top: 1px solid var(--sidebar-border);
}

/* Workspace */
.workspace {
    flex: 1;
    position: relative;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    background-position: -1px -1px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Simulation Active State - using box shadow to avoid border jump */
.workspace.simulation-active {
    box-shadow: inset 0 0 0 3px var(--success-color);
    border: none;
}

/* Pan Container */
#pan-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform-origin: 0 0;
    /* Allow transforms */
}

/* Toolbar */


.btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: none;
    font-weight: 500;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn.primary {
    background-color: var(--success-color);
    color: white;
}

.btn.primary:hover:not(:disabled) {
    background-color: #059669;
}

.btn.secondary {
    background-color: var(--component-border);
    color: var(--text-primary);
}

.btn.secondary:hover:not(:disabled) {
    background-color: #52525b;
}

.btn.danger {
    background-color: #7f1d1d;
    color: #fca5a5;
}

.btn.danger:hover:not(:disabled) {
    background-color: var(--danger-color);
    color: white;
}


/* Wire Layer */
.wire-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    overflow: visible !important;
}

/* Base Wire */
path.wire-base {
    fill: none;
    stroke: var(--wire-off);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-linejoin: round;
    cursor: pointer;
    pointer-events: stroke;
    transition: stroke 0.2s;
}

path.wire-base:hover {
    stroke: #71717a;
    /* Lighter grey on hover */
}

path.wire-base.selected {
    stroke: var(--accent-color);
    /* Highlight color */
    filter: drop-shadow(0 0 4px var(--accent-color));
}

path.wire-base.selected {
    stroke: var(--accent-color);
    stroke-width: 5;
    filter: drop-shadow(0 0 6px var(--accent-color));
}

/* Signal Wire */
path.wire-signal {
    fill: none;
    stroke: var(--wire-on);
    stroke-width: 4;
    stroke-linecap: round;
    stroke-linejoin: round;
    pointer-events: none;
    opacity: 0;
    filter: drop-shadow(0 0 8px var(--wire-on));
}

path.wire-signal.transmitting {
    opacity: 1;
    transition: stroke-dashoffset linear;
}


/* Components on Canvas */
.placed-component {
    position: absolute;
    background-color: var(--component-bg);
    border: 1px solid var(--component-border);
    border-radius: 8px;
    padding: 0;
    /* Removed padding for cleaner center look */
    width: 80px;
    /* Fixed size for uniformity */
    height: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: move;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 5;
    color: var(--text-primary);
}

.placed-component.selected {
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.3);
}

.placed-component:hover {
    border-color: var(--text-secondary);
}

/* Pins */
.pin {
    width: 12px;
    height: 12px;
    background-color: var(--pin-color);
    border-radius: 50%;
    position: absolute;
    cursor: crosshair;
    transition: transform 0.2s, background-color 0.2s;
    z-index: 10;
}

.pin:hover {
    background-color: var(--pin-hover);
    transform: scale(1.2);
}

.pin.active {
    background-color: #ef4444;
    box-shadow: 0 0 6px #ef4444;
}

.pin.input {
    left: -6px;
    top: 50%;
    transform: translateY(-50%);
}

.pin.output {
    right: -6px;
    top: 50%;
    transform: translateY(-50%);
}

/* Specific Component Styles */
.switch-control {
    width: 50px;
    height: 26px;
    background-color: #3f3f46;
    border-radius: 13px;
    position: relative;
    cursor: pointer;
    transition: background-color 0.3s;
}

.switch-control.active {
    background-color: var(--accent-color);
}

.switch-control::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.switch-control.active::after {
    transform: translateX(24px);
}

/* Momentary Switch (Button) */
.switch-control.momentary {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background-color: #3f3f46;
    border: 2px solid #52525b;
    display: flex;
    align-items: center;
    justify-content: center;
}

.switch-control.momentary::after {
    content: '';
    width: auto;
    height: auto;
    background: none;
    position: static;
    border-radius: 0;
    transform: none !important;
}

.switch-control.momentary.active {
    background-color: var(--accent-color);
    border-color: var(--accent-hover);
    box-shadow: 0 0 12px var(--accent-color);
}

.led-indicator {
    width: 40px;
    /* Bigger LED */
    height: 40px;
    background-color: var(--led-off);
    border-radius: 50%;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5);
    transition: background-color 0.1s, box-shadow 0.1s;
}

.led-indicator.active {
    background-color: var(--led-on);
    box-shadow: 0 0 20px var(--led-on), inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* LED Colors - Off State (dimmed) */
.led-indicator.red {
    background-color: #4a1515;
}

.led-indicator.green {
    background-color: #0d3d1a;
}

.led-indicator.blue {
    background-color: #1a2744;
}

/* LED Colors - Active State */
.led-indicator.red.active {
    background-color: #ef4444;
    box-shadow: 0 0 20px #ef4444;
}

.led-indicator.green.active {
    background-color: #22c55e;
    box-shadow: 0 0 20px #22c55e;
}

.led-indicator.blue.active {
    background-color: #3b82f6;
    box-shadow: 0 0 20px #3b82f6;
}


/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-overlay.hidden {
    display: none;
}

.modal-content {
    background-color: var(--sidebar-bg);
    border: 1px solid var(--sidebar-border);
    padding: 2rem;
    border-radius: 12px;
    width: 300px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.modal-content h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.modal-actions {
    margin-top: 2rem;
    display: flex;
    justify-content: space-between;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group select {
    width: 100%;
    padding: 0.5rem;
    background-color: var(--bg-color);
    border: 1px solid var(--component-border);
    color: var(--text-primary);
    border-radius: 6px;
    outline: none;
}

.form-group select:focus {
    border-color: var(--accent-color);
}

.form-group input[type="range"] {
    width: 100%;
    height: 8px;
    background: var(--component-border);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin-bottom: 0.5rem;
}

.form-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.2s;
}

.form-group input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--accent-hover);
}

.form-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

#speed-value {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Node Component */
.placed-component[data-type="node"] {
    width: 20px;
    height: 20px;
    background: transparent;
    border: none;
    display: flex;
    /* Center the pin */
    align-items: center;
    justify-content: center;
    box-shadow: none;
    /* No shadow for node itself */
}

.placed-component[data-type="node"] .pin {
    width: 12px;
    height: 12px;
    background-color: var(--text-secondary);
    border: 2px solid var(--text-secondary);
    border-radius: 50%;
    position: static;
    /* Relative to flex container */
    cursor: crosshair;
    transition: background-color 0.2s, transform 0.2s;
}

.placed-component[data-type="node"] .pin:hover {
    background-color: var(--u-blue-400);
    border-color: var(--u-blue-400);
    transform: scale(1.2);
}

.placed-component[data-type="node"].selected .pin {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.5);
}


/* Selection Box */
.selection-box {
    position: absolute;
    background-color: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--accent-color);
    pointer-events: none;
    /* Let clicks pass through */
    display: none;
    z-index: 1000;
}