/* CSS Custom Properties */
:root {
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --error-color: #f44336;
    --spacing-unit: 1rem;
    --border-radius: 4px;
    --font-monospace: 'Courier New', monospace;
    --font-sans: 'Segoe UI', Tahoma, sans-serif;
    
    /* Segment colors for table rows */
    --segment-0: #f0f0f0;
    --segment-1: #e0e0f0;
    --segment-2: #f0e0e0;
    --segment-3: #e0f0e0;
    --segment-4: #f0f0e0;
    --segment-5: #e0f0f0;
    --segment-6: #f0e0f0;
    --segment-7: #e0e0e0;
}

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* Header */
.app-header {
    background: var(--primary-color);
    color: white;
    padding: 1.5rem var(--spacing-unit);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.header-content {
    text-align: left;
}

.app-header h1 {
    margin-bottom: 0.5rem;
}

.app-header p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.header-links {
    display: flex;
    gap: 1rem;
}

.user-guide-link {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
    white-space: nowrap;
}

.user-guide-link:hover {
    background-color: rgba(255, 255, 255, 0.3);
    text-decoration: none;
}

/* Responsive header */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-content {
        text-align: center;
    }
}


/* Main Container */
.app-main {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 var(--spacing-unit);
}

/* Sections */
section {
    background: white;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

section h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

/* File Picker / Drop Zone */
.drop-zone {
    border: 2px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    background-color: #fafafa;
}

.drop-zone.drag-over {
    background-color: #e3f2fd;
    border-color: #1976D2;
}

.drop-zone p {
    margin-bottom: 1rem;
    color: #666;
}

/* Button Group */
.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin: 1rem 0;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-sans);
}

.btn:hover {
    transform: scale(1.02);
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    opacity: 0.6;
}

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

.btn-secondary {
    background-color: #757575;
    color: white;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
    width: 100%;
    margin: 0.5rem 0;
}

/* Validation Option */
.validation-option {
    margin-top: 1rem;
}

.validation-option label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
}

/* File Info */
.file-info {
    margin-top: 1rem;
    padding: 0.75rem;
    background-color: #e8f5e9;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--success-color);
}

/* Validation Errors */
.validation-errors {
    background-color: rgba(244, 67, 54, 0.1);
    border-left: 4px solid var(--error-color);
    padding: 1rem;
    border-radius: var(--border-radius);
}

.validation-errors h3 {
    color: var(--error-color);
    margin-bottom: 1rem;
}

.error-item {
    margin-bottom: 1.5rem;
}

.error-message {
    font-weight: bold;
    color: #c62828;
    margin-bottom: 0.5rem;
}

.error-context {
    font-family: var(--font-monospace);
    white-space: pre-wrap;
    background-color: #fff;
    padding: 0.5rem;
    border-radius: var(--border-radius);
    font-size: 0.85rem;
    overflow-x: auto;
}

.error-context .error-line {
    color: var(--error-color);
    font-weight: bold;
}

/* Collapsible Sections */
.collapsible-header {
    background-color: #f5f5f5;
    padding: 0.75rem 1rem;
    cursor: pointer;
    border-radius: var(--border-radius);
    user-select: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 1rem 0;
    border: 1px solid #ddd;
}

.collapsible-header:hover {
    background-color: #eeeeee;
}

.collapsible-header.overlap-warning {
    background-color: #ffebee;
    border-color: #f44336;
    color: #c62828;
    font-weight: bold;
}

.collapsible-header.overlap-warning:hover {
    background-color: #ffcdd2;
}

.expand-icon {
    display: inline-block;
    transition: transform 0.3s ease;
}

.collapsible-header.expanded .expand-icon {
    transform: rotate(90deg);
}

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.collapsible-content.expanded {
    max-height: none;
}

/* Overview Metrics */
.overview-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.metric-item {
    padding: 1rem;
    background-color: #f5f5f5;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.metric-label {
    font-weight: bold;
    color: #666;
    font-size: 0.9rem;
}

.metric-value {
    font-size: 1.5rem;
    color: #333;
    margin-top: 0.25rem;
}

/* Segment Details */
.segment-box {
    border: 1px solid #ddd;
    padding: 1rem;
    margin: 0.5rem 0;
    background-color: #fafafa;
    border-radius: var(--border-radius);
}

.segment-box h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Overlapping Memory Table */
.overlapping-memory {
    margin-top: 1.5rem;
}

.overlapping-memory h3 {
    color: var(--error-color);
    margin-bottom: 1rem;
}

.overlap-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.overlap-table th,
.overlap-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

.overlap-table th {
    background-color: #f5f5f5;
    font-weight: bold;
}

.overlap-table tr:hover {
    background-color: #f9f9f9;
}

/* Table Controls */
.table-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: var(--font-sans);
}

/* Memory Map Table */
.table-wrapper {
    overflow-x: auto;
}

.memory-map-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.memory-map-table thead {
    position: sticky;
    top: 0;
    background-color: #424242;
    color: white;
    z-index: 10;
}

.memory-map-table th {
    padding: 0.75rem;
    text-align: left;
    font-weight: bold;
}

.memory-map-table td {
    padding: 0.75rem;
    border-bottom: 1px solid #ddd;
}

.memory-map-table tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

/* Segment row colors */
.memory-map-table .segment-0 { background-color: var(--segment-0); }
.memory-map-table .segment-1 { background-color: var(--segment-1); }
.memory-map-table .segment-2 { background-color: var(--segment-2); }
.memory-map-table .segment-3 { background-color: var(--segment-3); }
.memory-map-table .segment-4 { background-color: var(--segment-4); }
.memory-map-table .segment-5 { background-color: var(--segment-5); }
.memory-map-table .segment-6 { background-color: var(--segment-6); }
.memory-map-table .segment-7 { background-color: var(--segment-7); }

/* Indentation for groups */
.memory-map-table .indent-1 { padding-left: 1.75rem; }
.memory-map-table .indent-2 { padding-left: 2.75rem; }
.memory-map-table .indent-3 { padding-left: 3.75rem; }
.memory-map-table .indent-4 { padding-left: 4.75rem; }

/* Table Stats */
.table-stats {
    margin-top: 1rem;
    padding: 0.5rem;
    background-color: #f5f5f5;
    border-radius: var(--border-radius);
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

/* Tree View */
.tree-view {
    font-family: var(--font-monospace);
    font-size: 0.9rem;
    padding: 1rem;
}

.tree-node {
    position: relative;
    padding-left: 20px;
    margin: 2px 0;
}

.tree-node:hover {
    background-color: rgba(33, 150, 243, 0.05);
}

.tree-node-header {
    cursor: pointer;
    user-select: none;
    padding: 2px 4px;
}

.tree-node-content {
    margin-left: 15px;
    padding: 4px;
    border-left: 1px solid #ccc;
}

.tree-node.collapsed > .tree-children {
    display: none;
}

.tree-expand-icon {
    display: inline-block;
    width: 12px;
    transition: transform 0.2s ease;
}

.tree-node.expanded > .tree-node-header .tree-expand-icon {
    transform: rotate(90deg);
}

.tree-node-detail {
    margin-left: 20px;
    padding: 2px 0;
    color: #666;
}

.tree-node-detail.warning {
    color: var(--error-color);
    font-style: italic;
}

.tree-segment {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 1.05em;
}

.tree-group {
    font-style: italic;
    color: #666;
    margin-left: 0;
}

.tree-group > .tree-node-header {
    background-color: #f5f5f5;
    padding: 4px 8px;
    border-radius: 3px;
    margin: 2px 0;
}

.tree-group > .tree-node-header:hover {
    background-color: #e8e8e8;
}

/* Tree Controls */
.tree-controls {
    margin-bottom: 1rem;
    padding: 0.75rem;
    background-color: #f5f5f5;
    border-radius: var(--border-radius);
}

.tree-controls label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 2rem var(--spacing-unit);
    color: #666;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-main {
        padding: 0 0.5rem;
    }
    
    section {
        padding: 1rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .table-controls {
        flex-direction: column;
    }
    
    .search-input {
        width: 100%;
    }
    
    .memory-map-table {
        font-size: 0.8rem;
    }
    
    .memory-map-table th,
    .memory-map-table td {
        padding: 0.5rem;
    }
    
    .tree-view {
        font-size: 0.8rem;
    }
}

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Hidden */
.hidden {
    display: none !important;
}