/* ============================================
   PDF Diff Checker - Specific Styles
   ============================================ */

/* Main Layout */
.diff-layout {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* ============================================
   Upload Section
   ============================================ */
.upload-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
}

.upload-pair {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    margin-bottom: 24px;
}

.upload-card {
    flex: 1;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 32px 24px;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
    text-align: center;
    color: var(--text-secondary);
}

.upload-label svg {
    width: 48px;
    height: 48px;
    stroke: var(--text-muted);
    transition: stroke 0.2s ease;
}

.upload-label:hover {
    border-color: var(--accent-it);
    color: var(--text-primary);
}

.upload-label:hover svg {
    stroke: var(--accent-it);
}

.upload-label.has-file {
    border-style: solid;
    border-color: var(--accent-success);
    background: var(--accent-success-dim);
}

.file-input {
    display: none;
}

.file-info {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-align: center;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.vs-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--accent-it);
    flex-shrink: 0;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Progress Section
   ============================================ */
.progress-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px 32px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-it), var(--accent-success));
    border-radius: 4px;
    width: 0%;
    transition: width 0.3s ease;
}

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

/* ============================================
   Comparison Section
   ============================================ */
.comparison-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.pdf-viewers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.pdf-panel {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pdf-panel .panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.pdf-panel .panel-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.page-indicator {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Canvas Container */
.canvas-container {
    position: relative;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: auto;
    min-height: 400px;
    max-height: 600px;
    padding: 16px; /* Moved padding here from canvas-content */
}

/* Scrollable content wrapper */
.canvas-content {
    position: relative;
    display: inline-block; /* Allows canvas to determine size */
    flex-shrink: 0;
}

.canvas-container canvas {
    display: block; /* Remove default inline spacing */
}

/* Highlight Overlay - must align exactly with canvas */
.highlight-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}

/* Highlight Rectangles */
.highlight-rect {
    position: absolute;
    opacity: 0.35;
    transition: opacity 0.2s ease;
}

.highlight-rect:hover {
    opacity: 0.6;
}

/* Insertions: Green - content added in PDF B */
.highlight-rect.insertion {
    fill: var(--accent-success);
}

/* Deletions: Red - content removed from PDF A */
.highlight-rect.deletion {
    fill: var(--accent-error);
}

/* Modifications: Yellow - content changed (shown on both PDFs) */
.highlight-rect.modified {
    fill: var(--accent-warning);
}

/* Page Navigation */
.page-nav {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.nav-btn:hover:not(:disabled) {
    border-color: var(--accent-it);
    color: var(--accent-it);
    background: var(--accent-it-dim);
}

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

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

/* ============================================
   Summary Section
   ============================================ */
.summary-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.summary-section h3 {
    font-size: 1.125rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.summary-stats {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.stat-item {
    flex: 1;
    min-width: 140px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-item.insertions .stat-value {
    color: var(--accent-success);
}

.stat-item.deletions .stat-value {
    color: var(--accent-error);
}

.stat-item.modifications .stat-value {
    color: var(--accent-warning);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px;
    color: var(--text-muted);
    text-align: center;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1rem;
}

/* ============================================
   Modal Styles
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-card);
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 1.125rem;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-content {
    padding: 20px;
    overflow-y: auto;
}

.modal-content h3 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.library-entry {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.library-entry:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.library-entry h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--accent-it);
}

.library-entry p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.library-license {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.library-license a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--accent-it);
    text-decoration: none;
    transition: color 0.2s ease;
}

.library-license a:hover {
    color: var(--accent-success);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .pdf-viewers {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .upload-pair {
        flex-direction: column;
    }

    .vs-badge {
        transform: rotate(90deg);
    }
}

@media (max-width: 768px) {
    .upload-section,
    .comparison-section,
    .summary-section {
        padding: 20px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .action-buttons .tool-btn {
        width: 100%;
    }

    .summary-stats {
        flex-direction: column;
    }

    .stat-item {
        min-width: 100%;
    }
}

/* ============================================
   Loading Spinner
   ============================================ */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-secondary);
    border-top-color: var(--accent-it);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* ============================================
   PDF-specific panel styling
   ============================================ */
.pdf-a-panel .panel-header {
    border-left: 4px solid var(--accent-error);
}

.pdf-b-panel .panel-header {
    border-left: 4px solid var(--accent-success);
}

/* PDF Loading State */
.canvas-container.loading {
    display: flex;
    align-items: center;
    justify-content: center;
}

.canvas-container.loading .spinner {
    position: absolute;
}

/* Error Message */
.error-message {
    background: var(--accent-error-dim);
    border: 1px solid var(--accent-error);
    border-radius: 8px;
    padding: 16px;
    color: var(--accent-error);
    text-align: center;
    font-size: 0.875rem;
    margin-bottom: 16px;
}

/* Warning Message */
.warning-message {
    background: var(--accent-warning-dim);
    border: 1px solid var(--accent-warning);
    border-radius: 8px;
    padding: 16px;
    color: var(--accent-warning);
    text-align: center;
    font-size: 0.875rem;
    margin-bottom: 8px;
    display: none;
}

/* Info Message - for edge case notifications */
.info-message {
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid var(--accent-it);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--accent-it);
    text-align: center;
    font-size: 0.875rem;
    margin-bottom: 8px;
    display: none;
}

.info-message.show {
    display: block;
    animation: slideIn 0.3s ease;
}

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