:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --border-radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Upload Section */
.upload-section {
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    transition: all 0.2s;
    cursor: pointer;
}

.drop-zone.drag-over {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.drop-zone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--secondary-color);
}

.drop-zone p {
    color: var(--text-secondary);
}

.or {
    font-size: 0.875rem;
}

/* Method Selection */
.method-selection {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.method-selection label {
    font-weight: 500;
    color: var(--text-secondary);
}

.method-selection select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    background: var(--surface);
    cursor: pointer;
}

.method-selection select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Extraction Failed Section */
.extraction-failed-section {
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.failed-dialog {
    text-align: center;
}

.failed-dialog h2 {
    color: var(--warning-color);
    margin-bottom: 1rem;
}

.failed-dialog p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.failed-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--background);
    border-radius: var(--border-radius);
}

.failed-stats .stat {
    text-align: center;
}

.failed-stats .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--warning-color);
}

.failed-stats .stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.alternatives-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.alternative-btn {
    padding: 0.75rem 1.25rem;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    background: var(--surface);
    color: var(--primary-color);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.alternative-btn .method-name {
    display: block;
    font-weight: 600;
}

.alternative-btn .method-desc {
    display: block;
    font-size: 0.75rem;
    opacity: 0.8;
}

.failed-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Processing Section */
.processing-section {
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.processing-header {
    margin-bottom: 2rem;
}

.processing-header h2 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.progress-container {
    background: var(--background);
    border-radius: 9999px;
    height: 8px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-bar {
    background: var(--primary-color);
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.sections-container h3 {
    margin-bottom: 1rem;
    font-size: 1rem;
    color: var(--text-secondary);
}

.sections-list {
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
}

.section-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    animation: slideIn 0.3s ease;
}

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

.section-item .section-number {
    font-weight: 600;
    color: var(--primary-color);
    margin-right: 0.5rem;
}

.section-item .section-title {
    color: var(--text-primary);
}

.section-item .section-stats {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Results Section */
.results-section {
    background: var(--surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
}

.results-header {
    margin-bottom: 2rem;
}

.stats {
    display: flex;
    gap: 2rem;
    margin-top: 1rem;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Section Browser */
.section-browser {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-height: 400px;
}

.browser-sidebar {
    border-right: 1px solid var(--border-color);
    padding: 1rem;
    overflow-y: auto;
    max-height: 500px;
}

.browser-sidebar h3 {
    margin-bottom: 1rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.section-tree .tree-item {
    padding: 0.5rem;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.section-tree .tree-item:hover {
    background: var(--background);
}

.section-tree .tree-item.active {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

.browser-content {
    padding: 1rem;
    overflow-y: auto;
    max-height: 500px;
}

.section-detail .placeholder {
    color: var(--text-secondary);
    text-align: center;
    padding: 2rem;
}

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

.section-detail h5 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
}

.section-detail .content-preview {
    background: var(--background);
    padding: 1rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    white-space: pre-wrap;
    max-height: 200px;
    overflow-y: auto;
}

.submittal-list, .requirement-list {
    list-style: none;
}

.submittal-list li, .requirement-list li {
    padding: 0.5rem;
    background: var(--background);
    margin-bottom: 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

.submittal-type {
    font-weight: 600;
    color: var(--primary-color);
}

.approval-badge {
    display: inline-block;
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

.approval-badge.g {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
}

.approval-badge.s {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success-color);
}

/* Query Section */
.query-section {
    margin-bottom: 2rem;
}

.query-section h3 {
    margin-bottom: 1rem;
}

.query-input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.query-input-group input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.query-input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.query-results {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    min-height: 100px;
}

.query-result {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.query-result:last-child {
    border-bottom: none;
}

.query-result .result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.query-result .result-section {
    font-weight: 600;
    color: var(--primary-color);
}

.query-result .result-score {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.query-result .result-content {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.query-answer {
    background: rgba(37, 99, 235, 0.05);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1rem;
}

.query-answer h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

/* Method hint */
.method-hint {
    font-size: 0.75rem;
    color: var(--muted-color);
    margin-top: 0.5rem;
}

/* LLM Usage Stats */
.llm-usage-stats {
    background: var(--bg-secondary);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.llm-usage-stats h4 {
    margin: 0;
    font-size: 0.875rem;
    color: var(--primary-color);
}

.llm-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.llm-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
}

.llm-label {
    font-size: 0.75rem;
    color: var(--muted-color);
}

/* Semantic Data Sections */
.semantic-section {
    margin-top: 1.5rem;
}

.semantic-loading {
    color: var(--muted-color);
    font-size: 0.875rem;
    padding: 1rem;
}

/* Entity Cards */
.entities-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.entity-card {
    background: var(--bg-secondary);
    border-radius: 0.375rem;
    padding: 0.5rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    border-left: 3px solid var(--muted-color);
}

.entity-card.entity-equipment { border-left-color: #3b82f6; }
.entity-card.entity-material { border-left-color: #10b981; }
.entity-card.entity-location { border-left-color: #f59e0b; }
.entity-card.entity-standard { border-left-color: #8b5cf6; }

.entity-type {
    font-size: 0.625rem;
    text-transform: uppercase;
    color: var(--muted-color);
    font-weight: 600;
}

.entity-name {
    font-size: 0.875rem;
    color: var(--text-color);
}

.entity-attrs {
    font-size: 0.75rem;
    color: var(--muted-color);
}

/* Semantic Requirements */
.semantic-reqs-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.semantic-req-card {
    background: var(--bg-secondary);
    border-radius: 0.375rem;
    padding: 0.75rem;
    border-left: 3px solid var(--primary-color);
}

.req-subject-action {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.req-subject {
    font-weight: 600;
    color: var(--text-color);
}

.req-action {
    color: var(--primary-color);
}

.req-action-type {
    display: inline-block;
    font-size: 0.625rem;
    text-transform: uppercase;
    padding: 0.125rem 0.5rem;
    border-radius: 0.25rem;
    background: var(--muted-color);
    color: white;
    margin-right: 0.5rem;
}

.req-action-type.action-installation { background: #3b82f6; }
.req-action-type.action-testing { background: #10b981; }
.req-action-type.action-submission { background: #f59e0b; }
.req-action-type.action-compliance { background: #8b5cf6; }
.req-action-type.action-maintenance { background: #ec4899; }

.req-location {
    display: block;
    font-size: 0.75rem;
    color: var(--muted-color);
    margin-top: 0.25rem;
}

.req-standards {
    display: block;
    font-size: 0.75rem;
    color: #8b5cf6;
    margin-top: 0.25rem;
}

.req-text {
    font-size: 0.8125rem;
    color: var(--text-color);
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    line-height: 1.4;
}

.more-reqs {
    font-size: 0.875rem;
    color: var(--muted-color);
    text-align: center;
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .section-browser {
        grid-template-columns: 1fr;
    }
    
    .browser-sidebar {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        max-height: 200px;
    }
    
    .stats {
        flex-wrap: wrap;
        gap: 1rem;
    }
}