/* ===== Chapter Right Sidebar ===== */

#chapter-sidebar {
    width: 320px;
    min-width: 260px;
    max-width: 380px;
    height: 100%;
    background-color: var(--bg-panel);
    border-left: 1px solid var(--border);
    display: none; /* hidden by default, shown via JS */
    flex-direction: column;
    overflow: hidden;
    position: relative;
    transition: width var(--transition-med);
}

#chapter-sidebar.visible {
    display: flex;
}

/* ===== Sidebar Header ===== */

.cs-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    background: rgba(10, 10, 15, 0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    min-height: 48px;
    flex-shrink: 0;
}

.cs-header-title {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--accent);
    letter-spacing: 1px;
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cs-header-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.cs-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.85rem;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.cs-btn:hover {
    color: var(--accent);
    background: rgba(201, 168, 76, 0.08);
}

.cs-btn.active {
    color: var(--accent);
    background: rgba(201, 168, 76, 0.12);
}

/* ===== Sidebar Content Scroll ===== */

.cs-body {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.cs-body::-webkit-scrollbar {
    width: 5px;
}

.cs-body::-webkit-scrollbar-track {
    background: transparent;
}

.cs-body::-webkit-scrollbar-thumb {
    background-color: var(--border);
    border-radius: 3px;
}

/* ===== Section Blocks ===== */

.cs-section {
    border-bottom: 1px solid var(--border);
    animation: csSectionIn 0.3s ease both;
}

@keyframes csSectionIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.cs-section-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    cursor: pointer;
    transition: background var(--transition-fast);
    user-select: none;
}

.cs-section-header:hover {
    background: rgba(255, 255, 255, 0.02);
}

.cs-section-icon {
    font-size: 0.9rem;
    flex-shrink: 0;
}

.cs-section-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    font-weight: 600;
    flex: 1;
}

.cs-section-count {
    font-size: 0.7rem;
    color: var(--text-dim);
    background: rgba(255, 255, 255, 0.04);
    padding: 1px 8px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

.cs-section-collapse {
    font-size: 0.55rem;
    color: var(--text-dim);
    transition: transform var(--transition-fast);
}

.cs-section.collapsed .cs-section-collapse {
    transform: rotate(-90deg);
}

.cs-section.collapsed .cs-section-body {
    display: none;
}

.cs-section-body {
    padding: 0 0.75rem 0.75rem;
}

/* ===== Entity Items (Linked characters, locations, events) ===== */

.cs-entity-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.45rem 0.6rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 2px;
}

.cs-entity-item:hover {
    background: rgba(201, 168, 76, 0.06);
}

.cs-entity-icon {
    font-size: 0.85rem;
    flex-shrink: 0;
    width: 20px;
    text-align: center;
}

.cs-entity-info {
    flex: 1;
    min-width: 0;
}

.cs-entity-name {
    font-size: 0.82rem;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

.cs-entity-mentions {
    font-size: 0.68rem;
    color: var(--text-dim);
}

.cs-entity-badge {
    font-size: 0.65rem;
    background: rgba(201, 168, 76, 0.12);
    color: var(--accent);
    padding: 1px 7px;
    border-radius: 8px;
    white-space: nowrap;
    flex-shrink: 0;
}

/* Empty State */
.cs-empty {
    padding: 1rem;
    text-align: center;
    color: var(--text-dim);
    font-size: 0.8rem;
    font-style: italic;
}

/* ===== Notes Section ===== */

.cs-notes-area {
    width: 100%;
    min-height: 100px;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 0.82rem;
    line-height: 1.65;
    resize: vertical;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.cs-notes-area:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.cs-notes-area::placeholder {
    color: var(--text-dim);
    opacity: 0.6;
}

/* ===== Paragraph Annotations ===== */

.cs-paragraph-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.cs-paragraph-item {
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
}

.cs-paragraph-preview {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.45rem 0.6rem;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.cs-paragraph-preview:hover {
    background: rgba(255, 255, 255, 0.03);
}

.cs-paragraph-item.selected .cs-paragraph-preview {
    background: rgba(201, 168, 76, 0.06);
}

.cs-paragraph-num {
    font-size: 0.65rem;
    color: var(--accent-dark);
    font-weight: 600;
    min-width: 18px;
    text-align: right;
    padding-top: 2px;
    flex-shrink: 0;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.cs-paragraph-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.4;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    flex: 1;
    word-break: break-word;
}

.cs-paragraph-item.has-annotation .cs-paragraph-preview {
    border-left: 2px solid var(--accent);
    padding-left: calc(0.6rem - 2px);
}

/* Annotation area for each paragraph */
.cs-annotation-area {
    display: none;
    padding: 0.4rem 0.6rem 0.6rem 2rem;
    animation: csAnnotationIn 0.2s ease both;
}

@keyframes csAnnotationIn {
    from { opacity: 0; max-height: 0; }
    to { opacity: 1; max-height: 200px; }
}

.cs-paragraph-item.selected .cs-annotation-area {
    display: block;
}

.cs-annotation-input {
    width: 100%;
    min-height: 48px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.6rem;
    color: var(--accent-light);
    font-family: var(--font-body);
    font-size: 0.78rem;
    line-height: 1.5;
    resize: vertical;
    outline: none;
    transition: border-color var(--transition-fast);
}

.cs-annotation-input:focus {
    border-color: var(--accent);
}

.cs-annotation-input::placeholder {
    color: var(--text-dim);
    opacity: 0.5;
    font-style: italic;
}

/* ===== Annotation Indicator Dot ===== */
.cs-annotation-dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--accent);
    position: absolute;
    right: 8px;
    top: 10px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.cs-paragraph-item.has-annotation .cs-annotation-dot {
    opacity: 1;
}

/* ===== Toggle Button (for main toolbar) ===== */

#btn-toggle-chapter-sidebar {
    display: none; /* shown only for chapters */
}

#btn-toggle-chapter-sidebar.active {
    background: rgba(201, 168, 76, 0.1);
    color: var(--accent);
}

/* ===== Resize Handle ===== */

.cs-resize-handle {
    position: absolute;
    left: -3px;
    top: 0;
    width: 6px;
    height: 100%;
    cursor: col-resize;
    z-index: 5;
    transition: background var(--transition-fast);
}

.cs-resize-handle:hover,
.cs-resize-handle:active {
    background: rgba(201, 168, 76, 0.2);
}

/* ===== Responsive ===== */

@media (max-width: 1100px) {
    #chapter-sidebar {
        width: 280px;
        min-width: 220px;
    }
}

@media (max-width: 768px) {
    #chapter-sidebar {
        position: fixed;
        right: 0;
        top: 0;
        width: 85vw;
        max-width: 340px;
        height: 100%;
        z-index: 1050;
        box-shadow: -4px 0 24px rgba(0, 0, 0, 0.5);
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    #chapter-sidebar.visible {
        display: flex;
        transform: translateX(0);
    }
}