:root {
    /* Colors */
    --primary-color: #2563EB; /* Energetic Blue */
    --primary-hover: #1D4ED8;
    --secondary-color: #10B981; /* Success Green */
    --accent-color: #F59E0B; /* Warning/Accent Orange */
    --danger-color: #EF4444;
    
    --bg-dark: #0F172A;
    --bg-panel: #FFFFFF;
    --bg-canvas: #F1F5F9;
    
    --text-main: #1E293B;
    --text-muted: #64748B;
    --border-color: #E2E8F0;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;

    /* UI Elements */
    --radius-sm: 4px;
    --radius-md: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    
    /* Header Height */
    --header-height: 60px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

/* Layout */
.app-container {
    display: grid;
    grid-template-columns: 280px 1fr 320px;
    height: 100vh;
    width: 100vw;
}

/* Sidebar Styles */
.sidebar {
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow-y: auto;
    z-index: 10;
    box-shadow: var(--shadow-sm);
}

.right-sidebar {
    border-left: 1px solid var(--border-color);
    border-right: none;
}

.logo-area {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.logo-area h1 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.025em;
}

.panel-section {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.panel-section h2 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

/* Sidebar Tabs */
.sidebar-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-panel);
}

.tab-btn {
    flex: 1;
    border: none;
    background: transparent;
    padding: 12px 0;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.2s;
    border-bottom: 2px solid transparent;
}

.tab-btn:hover {
    color: var(--primary-color);
    background: var(--bg-canvas);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.sidebar-content {
    flex: 1;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

.tab-pane {
    display: none;
    height: 100%;
    padding: var(--spacing-md);
    overflow-y: auto;
    flex-direction: column;
}

.tab-pane.active {
    display: flex;
}

/* Buttons & Inputs */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
    text-decoration: none;
}

.btn .material-icons {
    font-size: 1.2rem;
}

.full-width {
    width: 100%;
    margin-bottom: var(--spacing-sm);
}

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

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

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

.btn-secondary:hover {
    background-color: #059669;
}

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--bg-canvas);
    border-color: var(--text-muted);
}

.btn-danger {
    background-color: #FEF2F2;
    color: var(--danger-color);
    border-color: #FECACA;
}

.btn-danger:hover {
    background-color: #FEE2E2;
}

.btn-small {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.btn-text {
    background: none;
    color: var(--primary-color);
    padding: 0;
}

.btn-text:hover {
    text-decoration: underline;
}

/* Updated Tool Grid */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 10px;
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 15px 10px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    gap: 8px;
}

.tool-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-canvas);
}

.tool-btn.active {
    background: #EFF6FF;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tool-btn .material-icons {
    font-size: 24px;
}

.tool-btn span:not(.material-icons) {
    font-size: 0.75rem;
    font-weight: 500;
}

/* Canvas Area */
.canvas-area {
    position: relative;
    background-color: #E5E5E5; /* Neutral background for canvas area */
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Dot pattern background */
    background-image: radial-gradient(#CBD5E1 1px, transparent 1px);
    background-size: 20px 20px;
}

.canvas-wrapper {
    position: relative;
    box-shadow: var(--shadow-md);
    background-color: white;
    /* Fill the area */
    width: 100%;
    height: 100%;
}

#main-canvas {
    display: block;
    cursor: crosshair;
}

.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-muted);
    pointer-events: none;
}

.canvas-controls {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--bg-panel);
    padding: var(--spacing-xs);
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.icon-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background-color: transparent;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
}

.icon-btn:hover {
    background-color: var(--bg-canvas);
}

/* Metadata Panel */
.panel-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-panel);
}

.panel-header h2 {
    font-size: 1rem;
    font-weight: 600;
}

.metadata-content {
    padding: var(--spacing-md);
}

.metadata-empty {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.form-group input[type="text"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.input-readonly {
    background-color: var(--bg-canvas);
    color: var(--text-muted);
    cursor: not-allowed;
}

.color-input {
    width: 100%;
    height: 40px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.divider {
    height: 1px;
    background-color: var(--border-color);
    margin: var(--spacing-lg) 0;
}

.hidden {
    display: none;
}

/* Search Input */
.search-input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-input:focus {
    border-color: var(--primary-color);
}

/* Schedule List */
.schedule-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding-bottom: var(--spacing-md);
}

.schedule-item {
    background: white;
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: grab;
    font-size: 0.8rem;
    transition: all 0.2s;
    user-select: none;
}

.schedule-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
    transform: translateX(2px);
}

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

.schedule-item .task-name {
    font-weight: 600;
    margin-bottom: 4px;
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.schedule-item .task-meta {
    color: var(--text-muted);
    font-size: 0.7rem;
    display: flex;
    justify-content: space-between;
}

.schedule-item.mapped {
    border-left: 3px solid var(--secondary-color);
    background-color: #F0FDF4;
}

.schedule-item.linked-activity {
    background-color: rgba(16, 185, 129, 0.15); /* Green transparent */
    border-left: 3px solid var(--secondary-color);
}

.task-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-bottom: 2px;
}

.task-code {
    font-weight: 600;
    background-color: var(--bg-canvas);
    padding: 0 4px;
    border-radius: 2px;
}

.task-dates {
    font-size: 0.65rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background-color: white;
    border-radius: var(--radius-md);
    width: 500px;
    max-width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-md);
}

.modal-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-body {
    padding: var(--spacing-md);
}

.settings-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.settings-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.settings-item input[type="text"] {
    flex: 1;
    border: none;
    background: transparent;
    font-weight: 500;
}

.settings-item input[type="color"] {
    width: 30px;
    height: 30px;
    border: none;
    padding: 0;
    cursor: pointer;
}

/* Activity Card */
.activity-card {
    background-color: var(--bg-canvas);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    margin-top: var(--spacing-xs);
}

.activity-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    margin-bottom: 4px;
}

.activity-row .label {
    color: var(--text-muted);
}

.activity-row .value {
    font-weight: 500;
    text-align: right;
}

/* Legend */
.view-legend {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.95);
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 100;
    min-width: 180px;
    backdrop-filter: blur(4px);
    border: 1px solid var(--border-color);
}

.view-select {
    width: 100%;
    padding: 6px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.875rem;
    margin-bottom: 8px;
    background: white;
    cursor: pointer;
}

.legend-items {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 300px;
    overflow-y: auto;
}

.legend-item {
    display: flex;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-main);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    margin-right: 8px;
    border: 1px solid rgba(0,0,0,0.1);
}

/* Layout Tabs */
.layout-tabs-container {
    display: flex;
    align-items: center;
    background-color: #e2e8f0;
    padding: 4px 8px 0 8px;
    border-bottom: 1px solid var(--border-color);
    height: 40px;
}

.layout-tabs {
    display: flex;
    overflow-x: auto;
    flex: 1;
    gap: 4px;
}

.layout-tab {
    padding: 6px 12px;
    background-color: #cbd5e1;
    border-radius: 6px 6px 0 0;
    font-size: 0.9rem;
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    transition: background-color 0.2s;
    min-width: 100px;
    justify-content: space-between;
}

.layout-tab:hover {
    background-color: #dbeafe;
}

.layout-tab.active {
    background-color: var(--bg-panel);
    color: var(--primary-color);
    font-weight: 600;
    box-shadow: 0 -2px 4px rgba(0,0,0,0.05);
}

.layout-tab .close-tab {
    font-size: 14px;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    opacity: 0.6;
}

.layout-tab .close-tab:hover {
    background-color: rgba(0,0,0,0.1);
    opacity: 1;
}

.btn-icon-small {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    cursor: pointer;
    border-radius: 4px;
    font-size: 1.2rem;
    color: var(--text-muted);
}

.btn-icon-small:hover {
    background-color: rgba(0,0,0,0.05);
    color: var(--primary-color);
}

/* Adjust Canvas Area to fit tabs */
.canvas-area {
    display: flex;
    flex-direction: column;
    background-color: #e2e8f0; /* Match tab container bg */
}

.canvas-wrapper {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-canvas);
    /* Ensure canvas wrapper takes remaining height */
}

/* Filters */
.checkbox-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 150px;
    overflow-y: auto;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    cursor: pointer;
}

.checkbox-item input[type="checkbox"] {
    cursor: pointer;
}

.filter-section {
    margin-bottom: var(--spacing-md);
}

.filter-section label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

/* Symbols Grid */
.symbols-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    padding: 10px 0;
}

.symbol-item {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: grab;
    transition: all 0.2s;
}

.symbol-item:hover {
    border-color: var(--primary-color);
    background: #eff6ff;
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.symbol-item img, .symbol-item svg {
    width: 32px;
    height: 32px;
    margin-bottom: 5px;
}

.symbol-item span {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 240px 1fr 280px;
    }
}

@media (max-width: 768px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }
    
    .sidebar {
        height: auto;
        max-height: 30vh;
    }
    
    .left-sidebar {
        order: 2;
    }
    
    .right-sidebar {
        order: 3;
    }
    
    .canvas-area {
        order: 1;
        height: 50vh;
    }
}

/* Context Menu */
.context-menu {
    position: absolute;
    background: white;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    border-radius: var(--radius-md);
    padding: 0.25rem 0;
    z-index: 1000;
    min-width: 180px;
}

.context-menu.hidden {
    display: none;
}

.menu-item {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-main);
    gap: 0.75rem;
    transition: background-color 0.2s;
}

.menu-item:hover {
    background-color: #F1F5F9;
}

.menu-item.disabled {
    color: var(--text-muted);
    pointer-events: none;
    opacity: 0.6;
}

.menu-item .material-icons {
    font-size: 1.25rem;
    color: var(--text-muted);
}

.context-menu .divider {
    height: 1px;
    background-color: var(--border-color);
    margin: 0.25rem 0;
}

/* Week Filter Dropdown */
.date-range-display {
    position: absolute;
    top: 20px;
    right: 20px;
    background: white;
    padding: 0; 
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    z-index: 100;
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
}

.icon-btn-text {
    background: none;
    border: none;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    font-size: 0.9rem;
    color: var(--text-main);
    cursor: pointer;
    font-weight: 500;
}

.icon-btn-text:hover {
    background-color: #f1f5f9;
    border-radius: var(--radius-md);
}

.week-filter-dropdown {
    position: absolute;
    top: 100%; /* Below the button */
    right: 0;
    margin-top: 8px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    width: 200px;
    display: flex;
    flex-direction: column;
    max-height: 300px;
    z-index: 101;
}

.week-filter-dropdown.hidden {
    display: none;
}

.week-filter-header {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #f8fafc;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
}

.week-filter-content {
    padding: 8px;
    overflow-y: auto;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 200px;
}

.week-filter-actions {
    padding: 8px;
    border-top: 1px solid var(--border-color);
    background-color: #f8fafc;
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
}

.week-checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    padding: 4px;
    border-radius: 4px;
    cursor: pointer;
}

.week-checkbox-item:hover {
    background-color: #f1f5f9;
}