/* =============================================
   PDF PANEL — Right-side document viewer with
   resizable drag handle, summary tab, and
   collapsible highlighted passages.
   ============================================= */

/* --- Panel Container --- */
.pdf-panel {
    width: 0;
    flex-shrink: 0;
    overflow: hidden;
    background: var(--color-white);
    border-left: var(--border-medium);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-smooth);
    position: relative;
    will-change: width;
}

.pdf-panel.open {
    width: var(--pdf-panel-default);
}

/* --- Resize Handle --- */
.pdf-resize-handle {
    position: absolute;
    top: 0;
    left: -3px;
    width: 6px;
    height: 100%;
    cursor: col-resize;
    z-index: 15;
    transition: background var(--transition-fast);
}

.pdf-resize-handle:hover,
.pdf-resize-handle.active {
    background: var(--color-orange);
    opacity: 0.4;
}

/* --- Panel Header --- */
.pdf-header {
    padding: 12px 16px;
    border-bottom: var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    gap: 8px;
}

.pdf-case-title {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 16px;
    color: var(--color-navy);
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.pdf-header-actions {
    display: flex;
    align-items: center;
    gap: 4px;
}

.pdf-action-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-gray-400);
    transition: all var(--transition-fast);
}

.pdf-action-btn svg,
.pdf-action-btn line,
.pdf-action-btn polyline {
    pointer-events: none;
}

.pdf-action-btn:hover {
    background: var(--color-gray-100);
    color: var(--color-navy);
}

/* --- Tab Bar --- */
.pdf-tabs {
    display: flex;
    border-bottom: var(--border-light);
    padding: 0 16px;
    flex-shrink: 0;
}

.pdf-tab {
    padding: 10px 16px;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-gray-500);
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.pdf-tab:hover {
    color: var(--color-gray-700);
}

.pdf-tab.active {
    color: var(--color-navy);
    border-bottom-color: var(--color-navy);
}

/* --- Tab Content --- */
.pdf-tab-content {
    display: none;
    flex: 1;
    overflow: hidden;
    flex-direction: column;
}

.pdf-tab-content.active {
    display: flex;
}

/* --- Summary Tab --- */
.summary-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.summary-content h1,
.summary-content h2,
.summary-content h3,
.summary-content h4 {
    font-family: var(--font-serif);
    font-weight: 400;
    font-style: italic;
    color: var(--color-navy);
    margin: 20px 0 10px;
    letter-spacing: -0.01em;
}

.summary-content h1 {
    font-size: 22px;
}

.summary-content h2 {
    font-size: 19px;
}

.summary-content h3 {
    font-size: 17px;
}

.summary-content p {
    font-size: 14px;
    line-height: 1.65;
    color: var(--color-gray-700);
    margin-bottom: 10px;
}

.summary-content ul,
.summary-content ol {
    padding-left: 18px;
    margin-bottom: 10px;
}

.summary-content li {
    list-style: disc;
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-gray-700);
    margin-bottom: 4px;
}

.summary-content strong {
    font-weight: 600;
    color: var(--color-gray-900);
}

/* --- Highlights Section (Collapsible) --- */
.highlights-section {
    flex-shrink: 0;
    border-bottom: var(--border-light);
    max-height: 200px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.highlights-section.collapsed {
    max-height: 36px;
}

.highlights-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.highlights-header:hover {
    background: var(--color-gray-50);
}

.highlights-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-gray-500);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.highlights-count {
    background: var(--color-orange-soft);
    color: #c2410c;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: var(--radius-full);
}

.highlights-toggle-icon {
    color: var(--color-gray-400);
    transition: transform 0.3s;
}

.highlights-section.collapsed .highlights-toggle-icon {
    transform: rotate(-90deg);
}

.highlights-section.hidden {
    display: none !important;
}

.highlights-list {
    padding: 0 12px 10px;
    overflow-y: auto;
    max-height: 160px;
}

.highlight-quote {
    font-size: 12px;
    line-height: 1.5;
    color: var(--color-navy);
    background: rgba(249, 115, 22, 0.04);
    border-left: 3px solid var(--color-orange);
    padding: 8px 12px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.highlight-quote:hover {
    background: rgba(249, 115, 22, 0.1);
    transform: translateX(2px);
}

/* --- PDF Viewer --- */
.pdf-viewer-container {
    flex: 1;
    overflow-y: auto;
    background: #e8e8e8;
    padding: 8px;
}

.pdf-page-wrapper {
    position: relative;
    margin: 0 auto 8px;
    background: var(--color-white);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
    border-radius: 2px;
    overflow: hidden;
}

.pdf-page-wrapper canvas {
    display: block;
    width: 100%;
    height: auto;
}

/* Text layer for selection and highlighting */
.pdf-text-layer {
    position: absolute;
    top: 0;
    left: 0;
    overflow: hidden;
    opacity: 0.3;
    line-height: 1;
}

.pdf-text-layer>span {
    position: absolute;
    white-space: pre;
    color: transparent;
    pointer-events: all;
}

.pdf-text-layer>span::selection {
    background: rgba(66, 133, 244, 0.3);
}

/* Highlight marks */
.pdf-text-layer mark {
    background: rgba(249, 115, 22, 0.15);
    border: 1.5px solid rgba(249, 115, 22, 0.5);
    border-radius: 2px;
    padding: 1px 0;
    position: absolute;
    pointer-events: none;
    box-sizing: border-box;
}