/* ========================================
   Notion-Style Doc Reader
   Minimal, Clean, Functional
   ======================================== */

/* CSS Variables - Notion Style */
:root {
    /* Light Mode (Default) */
    --bg-primary: #FFFFFF;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F7F6F3;
    --bg-hover: #EFEFEF;
    --bg-active: #E8E8E8;

    --text-primary: #37352F;
    --text-secondary: #787774;
    --text-tertiary: #B4B4B3;
    --text-placeholder: #9B9A97;

    --border: #E9E9E7;
    --border-light: #F0F0F0;

    --accent: #2383E2;
    --accent-hover: #0B6BCB;
    --accent-light: #E8F4FD;

    --sidebar-width: 260px;
    --toc-width: 240px;
    --content-max-width: 900px;

    --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Liberation Mono', monospace;

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;

    --transition: 150ms ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #191919;
    --bg-secondary: #202020;
    --bg-tertiary: #2F2F2F;
    --bg-hover: #363636;
    --bg-active: #3D3D3D;

    --text-primary: #E6E6E6;
    --text-secondary: #9B9A97;
    --text-tertiary: #636363;
    --text-placeholder: #636363;

    --border: #373737;
    --border-light: #2F2F2F;

    --accent: #529CCA;
    --accent-hover: #6FB3DE;
    --accent-light: #264E5E;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --bg-primary: #191919;
        --bg-secondary: #202020;
        --bg-tertiary: #2F2F2F;
        --bg-hover: #363636;
        --bg-active: #3D3D3D;
        --text-primary: #E6E6E6;
        --text-secondary: #9B9A97;
        --text-tertiary: #636363;
        --text-placeholder: #636363;
        --border: #373737;
        --border-light: #2F2F2F;
        --accent: #529CCA;
        --accent-hover: #6FB3DE;
        --accent-light: #264E5E;
    }
}

/* ========================================
   Base
   ======================================== */

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

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-ui);
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

button {
    font-family: inherit;
    font-size: inherit;
    border: none;
    background: none;
    cursor: pointer;
    color: inherit;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ========================================
   App Layout
   ======================================== */

.app {
    display: flex;
    min-height: 100vh;
}

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

.sidebar-backdrop {
    display: none;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width, 260px);
    min-width: 180px;
    max-width: 500px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition);
}

/* Resize Handle */
.resize-handle {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 5px;
    cursor: col-resize;
    background: transparent;
    transition: background var(--transition);
}

.resize-handle:hover,
.resize-handle.active {
    background: var(--accent);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

/* Sidebar Header */
.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-light);
}

.workspace {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 0;
}

.workspace-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    flex-shrink: 0;
}

.workspace-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-action {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: background var(--transition);
}

.sidebar-action:hover {
    background: var(--bg-hover);
}

/* Search Button */
.sidebar-search {
    padding: 8px 10px;
}

.search-button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    transition: background var(--transition);
}

.search-button:hover {
    background: var(--bg-hover);
}

.search-button span {
    flex: 1;
    text-align: left;
}

.search-button kbd {
    padding: 2px 5px;
    font-size: 11px;
    font-family: inherit;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
}

/* File Tree */
.file-tree {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.tree-section {
    padding: 0 8px;
}

.tree-section-header {
    padding: 10px 10px 6px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.tree-items {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

/* Skeleton Loading */
.skeleton-row {
    height: 28px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    margin: 4px 8px;
    opacity: 0.6;
    animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.skeleton-row.short {
    width: 60%;
}

@keyframes skeleton-pulse {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 0.7; }
}

/* Tree Item */
.tree-item {
    position: relative;
}

.tree-row {
    display: flex;
    align-items: center;
    gap: 4px;
    min-height: 40px;
    padding: 7px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.tree-row:hover {
    background: var(--bg-hover);
}

.tree-row.active {
    background: var(--bg-active);
}

.tree-toggle {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: transform var(--transition);
    flex-shrink: 0;
    touch-action: manipulation;
}

.tree-item.expanded > .tree-row .tree-toggle {
    transform: rotate(90deg);
}

.tree-item.no-children .tree-toggle {
    visibility: hidden;
}

.tree-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.tree-label {
    flex: 1;
    min-width: 0;
    font-size: 15px;
    line-height: 1.35;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tree-children {
    display: none;
    padding-left: 16px;
}

.tree-item.expanded > .tree-children {
    display: block;
}

.tree-item.loading > .tree-row .tree-toggle {
    animation: tree-toggle-spin 0.7s linear infinite;
}

@keyframes tree-toggle-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.tree-action-buttons {
    display: none;
    align-items: center;
    gap: 2px;
    margin-left: auto;
}

.tree-add-btn-wrap {
    position: relative;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 8px;
    border-top: 1px solid var(--border-light);
}

.sidebar-footer-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    padding: 9px 10px;
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-secondary);
    transition: background var(--transition);
}

.sidebar-footer-btn:hover {
    background: var(--bg-hover);
}

.sidebar-footer-btn .icon-sun { display: block; }
.sidebar-footer-btn .icon-moon { display: none; }

[data-theme="dark"] .sidebar-footer-btn .icon-sun { display: none; }
[data-theme="dark"] .sidebar-footer-btn .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .sidebar-footer-btn .icon-sun { display: none; }
    :root:not([data-theme="light"]) .sidebar-footer-btn .icon-moon { display: block; }
}

/* ========================================
   Main Content
   ======================================== */

.main {
    flex: 1;
    margin-left: var(--sidebar-width, 260px);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition);
}

.sidebar.collapsed ~ .main,
.main.expanded {
    margin-left: 0;
}

/* Top Bar */
.topbar {
    position: fixed;
    top: 0;
    right: 0;
    left: var(--sidebar-width, 260px);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    z-index: 50;
    transition: left var(--transition);
}

.sidebar.collapsed ~ .main .topbar,
.main.expanded .topbar {
    left: 0;
}

/* Spacer to prevent content from hiding under fixed topbar */
.welcome, .document {
    padding-top: 60px; /* Adjust according to topbar height */
    width: 100%;
    overflow-x: hidden;
    box-sizing: border-box;
}

.topbar-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: background var(--transition);
}

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

.topbar-btn.spinning svg {
    animation: spin 0.5s ease-in-out;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Delete button styles */
#deleteBtn {
    transition: all var(--transition);
}

#deleteBtn:disabled {
    display: none;
}

#deleteBtn:not(:disabled):hover {
    color: #e03131;
    background: rgba(224, 49, 49, 0.1);
}

#deleteBtn:not(:disabled):focus {
    outline: 2px solid rgba(224, 49, 49, 0.5);
    outline-offset: 2px;
}

#shareBtn:disabled {
    display: none;
}

#expandSidebar {
    display: none;
}

.sidebar.collapsed ~ .main #expandSidebar {
    display: flex;
}

.breadcrumb {
    flex: 1;
    font-size: 14px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.topbar-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

/* ========================================
   Document Search Bar
   ======================================== */

.doc-search-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 4px 8px;
    flex: 1;
    max-width: 400px;
    margin: 0 8px;
}

.doc-search-input-wrapper {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    position: relative;
}

.doc-search-input-wrapper svg {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.doc-search-input-wrapper input {
    flex: 1;
    border: none;
    background: none;
    outline: none;
    font-size: 14px;
    color: var(--text-primary);
    min-width: 0;
}

.doc-search-input-wrapper input::placeholder {
    color: var(--text-placeholder);
}

.doc-search-count {
    font-size: 12px;
    color: var(--text-tertiary);
    padding: 2px 6px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.doc-search-nav {
    display: flex;
    gap: 2px;
}

.doc-search-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: background var(--transition);
}

.doc-search-btn:hover {
    background: var(--bg-hover);
}

.doc-search-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.doc-search-close {
    margin-left: 2px;
}

/* Search Highlight */
.search-highlight {
    background: rgba(255, 215, 0, 0.4);
    border-radius: 2px;
    padding: 0 1px;
}

.search-highlight-active {
    background: rgba(255, 165, 0, 0.6);
    box-shadow: 0 0 0 2px rgba(255, 165, 0, 0.3);
    border-radius: 2px;
    padding: 0 1px;
}

[data-theme="dark"] .search-highlight {
    background: rgba(255, 195, 0, 0.5);
}

[data-theme="dark"] .search-highlight-active {
    background: rgba(255, 165, 0, 0.7);
    box-shadow: 0 0 0 2px rgba(255, 165, 0, 0.4);
}

/* Content Wrapper */
.content-wrapper {
    flex: 1;
    padding: 60px 96px 120px;
    max-width: var(--content-max-width);
    margin: 0 auto;
    width: 100%;
}

/* ========================================
   Welcome State
   ======================================== */

.welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 20px;
    min-height: calc(100vh - 120px);
}

.welcome-icon {
    color: var(--text-tertiary);
    margin-bottom: 24px;
}

.welcome-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.welcome-desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.welcome-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    transition: background var(--transition);
}

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

.welcome-btn kbd {
    padding: 2px 5px;
    font-size: 11px;
    font-family: inherit;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
}

/* ========================================
   Document
   ======================================== */

.document-cover {
    margin-bottom: 24px;
}

.document-icon {
    width: 78px;
    height: 78px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
}

.document-title {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.document-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.document-time {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 48px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-light);
}

.doc-path {
    font-size: 12px;
    font-family: var(--font-mono);
    color: var(--text-tertiary);
}

.copy-btn {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    transition: all var(--transition);
}

.copy-btn:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

/* Document Content (Notion-style prose) */
.document-content {
    color: var(--text-primary);
    line-height: 1.75;
    overflow-wrap: break-word;
    word-wrap: break-word;
}

.document-content * {
    max-width: 100%;
}

.document-content h1,
.document-content h2,
.document-content h3,
.document-content h4,
.document-content h5,
.document-content h6 {
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.3;
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.document-content h1 { font-size: 1.875em; margin-top: 1em; }
.document-content h2 { font-size: 1.5em; }
.document-content h3 { font-size: 1.25em; }
.document-content h4 { font-size: 1.125em; }
.document-content h5 { font-size: 1em; }
.document-content h6 { font-size: 0.875em; color: var(--text-secondary); }

.document-content h1:first-child,
.document-content h2:first-child,
.document-content h3:first-child {
    margin-top: 0;
}

.document-content p {
    margin-bottom: 1em;
}

.document-content a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.document-content a:hover {
    color: var(--accent-hover);
}

.document-content strong {
    font-weight: 600;
}

.document-content ul,
.document-content ol {
    margin-bottom: 1em;
    padding-left: 1.5em;
}

.document-content li {
    margin-bottom: 0.25em;
}

.document-content li::marker {
    color: var(--text-secondary);
}

.document-content blockquote {
    margin: 1em 0;
    padding: 0.25em 0 0.25em 1em;
    border-left: 3px solid var(--text-tertiary);
    color: var(--text-secondary);
}

.document-content blockquote p:last-child {
    margin-bottom: 0;
}

.document-content code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    padding: 0.2em 0.4em;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: #EB5757;
}

.document-content pre {
    margin: 1em 0;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

.document-content pre code {
    padding: 0;
    background: none;
    color: var(--text-primary);
    font-size: 14px;
}

.text-file-content {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    margin: 0;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    word-break: break-word;
    overflow-x: auto;
}

.document-content table {
    width: 100%;
    margin: 1em 0;
    border-collapse: collapse;
    font-size: 14px;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.document-content th,
.document-content td {
    padding: 8px 12px;
    text-align: left;
    border: 1px solid var(--border);
}

.document-content th {
    font-weight: 600;
    background: var(--bg-tertiary);
}

.document-content hr {
    margin: 2em 0;
    border: none;
    border-top: 1px solid var(--border);
}

.document-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1em 0;
    cursor: pointer;
    transition: transform var(--transition);
}

.document-content img:hover {
    transform: scale(1.02);
}

.image-file-viewer {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: min(70vh, 720px);
    padding: 24px 0;
}

.image-file-viewer img {
    max-width: 100%;
    max-height: calc(100vh - 180px);
    object-fit: contain;
    border-radius: var(--radius-md);
    cursor: zoom-in;
}

/* ========================================
   Image Grid (9-grid style like WeChat/Weibo)
   ======================================== */

.image-grid {
    display: grid;
    gap: 4px;
    margin: 1em 0;
    width: 100%;
    max-width: 540px;
}

.image-grid img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    margin: 0;
    border-radius: 2px;
    aspect-ratio: 1;
    cursor: pointer;
}

.image-grid img:hover {
    transform: scale(1.02);
}

/* 1 image - large single */
.image-grid.count-1 {
    display: block;
    max-width: 100%;
}

.image-grid.count-1 img {
    aspect-ratio: auto;
    max-height: 400px;
    object-fit: contain;
    border-radius: var(--radius-md);
}

/* 2 images - side by side */
.image-grid.count-2 {
    grid-template-columns: repeat(2, 1fr);
    aspect-ratio: 2;
}

/* 3 images - one row */
.image-grid.count-3 {
    grid-template-columns: repeat(3, 1fr);
}

/* 4 images - 2x2 */
.image-grid.count-4 {
    grid-template-columns: repeat(2, 1fr);
}

/* 5 images - 2 on first row, 3 on second */
.image-grid.count-5 {
    grid-template-columns: repeat(3, 1fr);
}

.image-grid.count-5 img:nth-child(1),
.image-grid.count-5 img:nth-child(2) {
    grid-column: span 1;
}

/* 6 images - 2 rows of 3 */
.image-grid.count-6 {
    grid-template-columns: repeat(3, 1fr);
}

/* 7 images - 3 on first row, then 2x2 */
.image-grid.count-7 {
    grid-template-columns: repeat(3, 1fr);
}

/* 8 images - 3 on first row, 3 on second, 2 on third */
.image-grid.count-8 {
    grid-template-columns: repeat(3, 1fr);
}

/* 9 images - 3x3 */
.image-grid.count-9 {
    grid-template-columns: repeat(3, 1fr);
}

/* Image Lightbox */
.image-lightbox {
    position: fixed;
    inset: 0;
    z-index: 400;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
}

.image-lightbox.visible {
    opacity: 1;
    visibility: visible;
}

.image-lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.image-lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: background var(--transition);
}

.image-lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Mobile responsive */
@media (max-width: 768px) {
    .image-grid {
        max-width: 100%;
        gap: 2px;
    }

    .image-grid.count-1 img {
        max-height: 300px;
    }

    .text-file-content {
        padding: 12px;
        font-size: 13px;
        line-height: 1.55;
    }
}

/* Inline tags (#tag) styling */
.document-content .inline-tag {
    display: inline;
    color: var(--accent);
    background: var(--accent-light);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
    font-weight: 500;
}

/* ========================================
   Table of Contents
   ======================================== */

.toc {
    position: fixed;
    top: 60px;
    right: 0;
    bottom: 0;
    width: var(--toc-width);
    padding: 0 0 20px 0;
    display: none;
    flex-direction: column;
    background: var(--bg-primary);
    border-left: 1px solid var(--border-light);
}

.toc.visible {
    display: flex;
}

.toc-header {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    padding: 12px 14px;
    flex-shrink: 0;
}

.toc-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
    flex: 1;
    padding: 0 14px 0 16px;
}

.toc-item {
    padding: 6px 8px;
    padding-left: 12px;
    font-size: 13px;
    color: var(--text-secondary);
    border-left: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1.4;
    word-break: break-word;
}

.toc-item:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.toc-item.active {
    color: var(--text-primary);
    border-left-color: var(--text-primary);
    background: var(--bg-tertiary);
}

.toc-h3 { padding-left: 20px; }
.toc-h4 { padding-left: 28px; }

/* Mobile TOC Overlay */
.toc-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
}

.toc-overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* Mobile TOC Panel */
@media (max-width: 1200px) {
    .toc {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: auto;
        width: 280px;
        max-width: 85vw;
        padding: 16px;
        z-index: 160;
        display: none;
        flex-direction: column;
        transform: translateX(100%);
        transition: transform var(--transition);
        border-left: 1px solid var(--border);
        box-shadow: -4px 0 16px rgba(0, 0, 0, 0.1);
    }

    .toc.visible {
        display: flex;
        transform: translateX(0);
    }

    .toc-header {
        font-size: 14px;
        font-weight: 600;
        color: var(--text-primary);
        text-transform: none;
        margin-bottom: 16px;
        padding-bottom: 12px;
        border-bottom: 1px solid var(--border-light);
    }

    .toc-item {
        padding: 8px 12px;
        font-size: 14px;
        border-radius: var(--radius-sm);
    }

    .toc-h3 { padding-left: 24px; }
    .toc-h4 { padding-left: 36px; }
}

/* ========================================
   Search Modal
   ======================================== */

.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 20vh;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
}

.modal.visible {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transform: scale(0.96) translateY(-10px);
    transition: transform var(--transition);
}

.modal.visible .modal-content {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

.modal-header input {
    flex: 1;
    border: none;
    background: none;
    font-size: 16px;
    color: var(--text-primary);
    outline: none;
}

.modal-header input::placeholder {
    color: var(--text-placeholder);
}

.modal-header kbd {
    padding: 4px 6px;
    font-size: 11px;
    font-family: inherit;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
}

.modal-body {
    max-height: 400px;
    overflow-y: auto;
    padding: 8px;
}

.search-placeholder {
    padding: 32px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* Search Result */
.search-result {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition);
}

.search-result:hover,
.search-result.selected {
    background: var(--bg-hover);
}

.search-result-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-result-info {
    flex: 1;
    min-width: 0;
}

.search-result-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-result-path {
    font-size: 12px;
    color: var(--text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-result-snippet {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.4;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    white-space: normal;
}

/* ========================================
   Login Modal
   ======================================== */

.login-modal-content {
    max-width: 400px;
}

.modal-close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: background var(--transition);
    margin-left: auto;
}

.modal-close:hover {
    background: var(--bg-hover);
}

/* Hide close button when auth is required */
#loginModal.auth-required .modal-close {
    display: none;
}

/* Prevent backdrop click from closing when auth is required */
#loginModal.auth-required .modal-backdrop {
    pointer-events: auto;
}

.login-form {
    padding: 8px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: border-color var(--transition);
}

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

.form-group input::placeholder {
    color: var(--text-placeholder);
}

.login-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity var(--transition);
}

.login-btn:hover {
    opacity: 0.9;
}

.login-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.primary-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity var(--transition);
}

.primary-btn:hover {
    opacity: 0.9;
}

.primary-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.login-loading svg {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.login-error {
    margin-top: 12px;
    padding: 10px 12px;
    background: rgba(235, 87, 87, 0.1);
    border: 1px solid rgba(235, 87, 87, 0.2);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: #EB5757;
}

/* Auth Button States */
#authBtn .icon-login { display: block; }
#authBtn .icon-logout { display: none; }

#authBtn.authenticated .icon-login { display: none; }
#authBtn.authenticated .icon-logout { display: block; }

#authBtn.authenticated .auth-label { display: none; }
#authBtn.authenticated .auth-username { display: block; }

/* ========================================
   Share Modal
   ======================================== */

.share-modal-content {
    max-width: 560px;
}

.share-body {
    padding: 16px;
}

.share-current-file {
    padding: 10px 12px;
    margin-bottom: 14px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.share-controls {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 12px;
}

.share-controls .form-group {
    margin-bottom: 14px;
}

.share-controls select,
.share-controls input {
    width: 100%;
    margin-top: 6px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    background: var(--bg-primary);
    font-size: 14px;
}

.share-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 16px;
}

.share-empty {
    padding: 18px 12px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 13px;
}

.share-link-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
}

.share-link-item.inactive {
    opacity: 0.62;
}

.share-link-info {
    flex: 1;
    min-width: 0;
}

.share-link-url {
    color: var(--text-primary);
    font-size: 13px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.share-link-meta {
    margin-top: 3px;
    color: var(--text-tertiary);
    font-size: 12px;
}

.share-link-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.icon-btn {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: background var(--transition), color var(--transition);
}

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

.icon-btn.danger:hover {
    color: #e03131;
    background: rgba(224, 49, 49, 0.1);
}

/* ========================================
   Public Share Page
   ======================================== */

.share-page {
    background: var(--bg-primary);
}

.share-shell {
    width: 100%;
    min-height: 100vh;
}

.share-document {
    display: block;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 72px 24px 96px;
}

body.share-page .share-title {
    display: block !important;
}

.share-content {
    display: block;
}

.share-expires {
    display: inline-block;
    margin-left: 10px;
}

.share-error {
    max-width: 560px;
    margin: 20vh auto 0;
    padding: 0 24px;
    text-align: center;
}

.share-error h1 {
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: 28px;
}

.share-error p {
    color: var(--text-secondary);
}

/* Lightweight /view page (knowledge-base deep links) */
.view-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 14px 24px 0;
}

.view-toolbar-meta {
    min-width: 0;
    font-size: 12px;
    color: var(--text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.view-toolbar-link {
    flex-shrink: 0;
    font-size: 13px;
    color: var(--accent);
    text-decoration: none;
}

.view-toolbar-link:hover {
    text-decoration: underline;
}

.view-fallback {
    margin-top: 20px;
}

.view-fallback a {
    color: var(--accent);
}

@media (prefers-color-scheme: dark) {
    .login-error {
        background: rgba(235, 87, 87, 0.15);
        border-color: rgba(235, 87, 87, 0.3);
    }
}

/* ========================================
   Toast
   ======================================== */

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    padding: 10px 16px;
    background: var(--text-primary);
    color: var(--bg-primary);
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    opacity: 0;
    transition: all var(--transition);
    z-index: 300;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

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

@media (max-width: 1200px) {
    /* TOC handled in mobile section above */
}

@media (max-width: 768px) {
    .sidebar-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 95;
        background: rgba(15, 15, 15, 0.35);
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--transition);
    }

    .sidebar-backdrop.visible {
        opacity: 1;
        pointer-events: auto;
    }

    .sidebar {
        width: min(88vw, 360px);
        max-width: 360px;
        transform: translateX(-100%);
        z-index: 100;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-header {
        padding: 14px 16px;
    }

    .workspace-name {
        font-size: 16px;
    }

    .sidebar-search {
        padding: 10px 12px;
    }

    .search-button {
        min-height: 44px;
        padding: 10px 12px;
        font-size: 15px;
    }

    .tree-section {
        padding: 0 10px;
    }

    .tree-section-header {
        padding: 10px 10px 8px;
        font-size: 12px;
    }

    .tree-row {
        min-height: 50px;
        padding: 10px 12px;
        gap: 8px;
    }

    .tree-toggle,
    .tree-icon {
        width: 26px;
        height: 26px;
    }

    .tree-label {
        font-size: 16px;
    }

    .sidebar-footer {
        padding: 10px;
    }

    .sidebar-footer-btn {
        min-height: 44px;
        padding: 10px 12px;
        font-size: 15px;
    }

    .main {
        margin-left: 0;
    }

    .topbar {
        left: 0;
        padding: 8px 12px;
        gap: 4px;
        z-index: 90;
    }

    .breadcrumb {
        font-size: 13px;
    }

    .document {
        width: 100%;
        max-width: 100%;
        overflow-x: hidden;
    }

    .content-wrapper {
        width: 100%;
        max-width: 100%;
        padding: 60px 16px 96px;
        overflow-x: hidden;
    }

    #expandSidebar {
        display: flex !important;
    }

    /* Mobile document search bar */
    .doc-search-bar {
        max-width: none;
        margin: 0 4px;
        padding: 4px 6px;
    }

    .doc-search-input-wrapper input {
        font-size: 13px;
    }

    .doc-search-count {
        font-size: 11px;
        padding: 1px 4px;
    }

    .doc-search-btn {
        width: 22px;
        height: 22px;
    }

    .content-wrapper {
        padding: 24px 16px 60px;
        width: 100%;
        overflow-x: hidden;
    }

    .welcome {
        min-height: calc(100vh - 180px);
        padding: 40px 20px;
    }

    .document-title {
        font-size: 28px;
        word-break: break-word;
    }

    .document-content h1 { font-size: 1.5em; }
    .document-content h2 { font-size: 1.25em; }
    .document-content h3 { font-size: 1.125em; }

    .document-content p,
    .document-content li {
        font-size: 15px;
    }

    .document-content pre {
        padding: 12px;
        font-size: 13px;
        border-radius: var(--radius-sm);
    }

    .document-content table {
        font-size: 12px;
    }

    .document-content th,
    .document-content td {
        padding: 6px 8px;
    }
}

@media (max-width: 480px) {
    .topbar {
        padding: 8px 10px;
    }

    .breadcrumb {
        font-size: 12px;
    }

    /* Hide breadcrumb when search is open on very small screens */
    .topbar.search-open .breadcrumb {
        display: none;
    }

    .content-wrapper {
        padding: 20px 12px 40px;
    }

    .welcome {
        padding: 24px 12px;
    }

    .welcome-icon svg {
        width: 60px;
        height: 60px;
    }

    .welcome-title {
        font-size: 24px;
    }

    .welcome-desc {
        font-size: 14px;
    }

    .welcome-btn {
        padding: 8px 12px;
        font-size: 13px;
    }

    .welcome-btn kbd {
        display: none;
    }

    .document-title {
        font-size: 24px;
    }

    .document-icon {
        width: 60px;
        height: 60px;
    }

    .document-content pre {
        padding: 10px;
        font-size: 12px;
    }
}

/* ========================================
   Scrollbar
   ======================================== */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 5px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
    border: 2px solid transparent;
    background-clip: padding-box;
}

* {
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

/* Hide document cover icon and title */
.document-cover,
.document-title {
    display: none !important;
}

/* ========================================
   Directory Configuration
   ======================================== */

.dir-config-content {
    max-width: 500px;
}

.dir-list {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 16px;
}

.dir-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
    gap: 12px;
}

.dir-item-icon {
    flex-shrink: 0;
    color: var(--text-secondary);
}

.dir-item-info {
    flex: 1;
    min-width: 0;
}

.dir-item-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.dir-item-path {
    font-size: 12px;
    color: var(--text-tertiary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.dir-item-remove {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.dir-item-remove:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.dir-add-btn {
    width: 100%;
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px dashed var(--border);
    background: transparent;
    color: var(--text-secondary);
    font-size: 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.dir-add-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-light);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 16px;
    border-top: 1px solid var(--border-light);
}

.btn-secondary,
.btn-primary {
    padding: 8px 16px;
    font-size: 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

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

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

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
}

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

.dir-error {
    padding: 8px 12px;
    background: var(--bg-hover);
    color: #e03131;
    font-size: 13px;
    border-radius: var(--radius-md);
    margin-top: 8px;
}

[dir-config-modal] .empty-state {
    padding: 40px 20px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* ========================================
   Tree Filter Button
   ======================================== */

.tree-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.tree-filter-btn {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.tree-filter-btn:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.tree-filter-btn.active {
    color: var(--accent);
}

.tree-filter-btn.active:hover {
    background: var(--accent-light);
}

/* Tree Section Actions */
.tree-section-actions {
    display: flex;
    gap: 4px;
}

/* ========================================
   Tree Copy Button
   ======================================== */

.tree-copy-btn {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.tree-copy-btn:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.tree-copy-btn:active {
    background: var(--bg-active);
    color: var(--accent);
}

.tree-move-btn {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.tree-move-btn:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.tree-move-btn:active {
    background: var(--accent);
    color: white;
}

/* Tree delete button */
.tree-delete-btn {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.tree-delete-btn:hover {
    background: rgba(224, 49, 49, 0.1);
    color: #e03131;
}

.tree-delete-btn:active {
    background: rgba(224, 49, 49, 0.2);
    color: #e03131;
}

/* Tree add button */
.tree-add-btn {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.tree-add-btn:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.tree-add-btn:active {
    background: var(--accent);
    color: white;
}

/* Tree dropdown */
.tree-dropdown {
    position: absolute;
    right: 0;
    top: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 100;
    min-width: 130px;
    padding: 4px 0;
}

.tree-dropdown-item {
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-primary);
    transition: background var(--transition);
}

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

.tree-dropdown-item svg {
    flex-shrink: 0;
}

.path-preview-box {
    color: var(--text-secondary);
    font-size: 12px;
    font-family: var(--font-mono);
    background: var(--bg-tertiary);
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    line-height: 1.45;
    word-break: break-all;
}

/* ========================================
   Source View (Split View)
   ======================================== */

/* Source toggle button active state */
#sourceToggle.active {
    color: var(--accent);
    background: var(--accent-light);
}

.topbar.image-mode #sourceToggle,
.topbar.image-mode #tocToggle,
.topbar.image-mode #editBtn {
    display: none !important;
}

/* Document split view container */
#documentSplitView {
    display: none;
    gap: 24px;
    margin-top: 0;
    width: 100%;
}

.document.split-mode #documentSplitView {
    display: flex;
    flex: 1;
}

/* Remove max-width constraint in split mode */
.document.split-mode {
    max-width: none !important;
}

/* In split mode, content wrapper should fill available space */
.main.split-mode .content-wrapper {
    max-width: none !important;
    padding: 20px 24px;
}

.document.split-mode .document-content {
    max-width: none !important;
    width: 100%;
}

.document.split-mode .document-source {
    max-width: none !important;
    width: 100%;
}

/* Hide single view elements in split mode */
.document.split-mode .document-meta,
.document.split-mode .document-time,
.document.split-mode #docContentSingle,
.document.split-mode #docSourceSingle {
    display: none !important;
}

/* Source wrapper */
.document-source-wrapper,
#documentSourceWrapper {
    flex: 1;
    min-width: 0;
    overflow: visible;
    max-width: 50%;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 160px);
}

.source-header {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-light);
    flex-shrink: 0;
}

/* Source code display */
.document-source {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    padding: 16px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    margin: 0;
    flex: 1;
    overflow-y: auto;
}

/* Content wrapper for split view */
.document-content-wrapper,
#documentContentWrapper {
    flex: 1;
    min-width: 0;
    overflow: visible;
    max-width: 50%;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 160px);
}

.document-content-wrapper .source-header,
#documentContentWrapper .source-header {
    flex-shrink: 0;
}

/* Make document content scrollable in split view */
.document-content-wrapper .document-content,
#documentContentWrapper #docContent {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

/* Mobile: Single view mode - show source only */
.document.source-mode #docSourceSingle {
    display: block !important;
}

.document.source-mode #docContentSingle {
    display: none !important;
}

/* Hide split view elements in normal mode */
#docSourceSingle {
    display: none;
}

/* Show split view wrappers only in split mode */
#documentSourceWrapper,
#documentContentWrapper {
    display: none;
}

.document.split-mode #documentSourceWrapper,
.document.split-mode #documentContentWrapper {
    display: block;
}

/* Show single view elements in normal mode */
.document:not(.split-mode):not(.source-mode) #docContentSingle {
    display: block;
}

/* Split view divider */
.document-split-view::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border);
    transform: translateX(-50%);
}

.document-split-view {
    position: relative;
}

/* Mobile styles for source view */
@media (max-width: 768px) {
    .document-split-view {
        flex-direction: column;
        gap: 16px;
    }

    .document-split-view::before {
        display: none;
    }

    .document-source-wrapper,
    .document-content-wrapper {
        flex: none;
        width: 100%;
    }

    .document-source {
        max-height: none;
    }

    /* Mobile: Full width source when in source mode */
    .document.source-mode .document-source-single {
        display: block !important;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
        background: var(--bg-tertiary);
        padding: 16px;
        border-radius: var(--radius-md);
        margin: 0;
        font-size: 12px;
        line-height: 1.6;
        white-space: pre-wrap;
        overflow-wrap: anywhere;
        word-break: break-word;
        overflow-x: auto;
    }
}

/* ========================================
   JSON Viewer (Collapsible)
   ======================================== */

.json-viewer-wrapper {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
}

.json-toolbar {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
}

.json-btn {
    padding: 6px 12px;
    font-size: 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}

.json-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

.json-viewer {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    overflow-x: auto;
    font-size: 14px;
}

.json-item {
    position: relative;
}

.json-line {
    white-space: nowrap;
    cursor: default;
}

.json-item.expandable .json-line {
    cursor: pointer;
}

.json-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    margin-right: 4px;
    color: var(--text-tertiary);
    transition: transform var(--transition);
}

.json-item.collapsed .json-toggle svg {
    transform: rotate(0deg);
}

.json-item:not(.collapsed) .json-toggle svg {
    transform: rotate(90deg);
}

.json-key {
    color: #9333ea;
}

[data-theme="dark"] .json-key {
    color: #a78bfa;
}

.json-colon {
    color: var(--text-secondary);
}

.json-bracket {
    color: var(--text-secondary);
}

.json-count {
    color: var(--text-tertiary);
    font-style: italic;
    font-size: 12px;
}

.json-value {
    white-space: nowrap;
}

.json-value.json-string {
    color: #059669;
}

[data-theme="dark"] .json-value.json-string {
    color: #34d399;
}

.json-value.json-number {
    color: #0284c7;
}

[data-theme="dark"] .json-value.json-number {
    color: #38bdf8;
}

.json-value.json-boolean {
    color: #d97706;
}

[data-theme="dark"] .json-value.json-boolean {
    color: #fbbf24;
}

.json-value.json-null {
    color: var(--text-tertiary);
    font-style: italic;
}

.json-children {
    margin-left: 0;
    white-space: normal;
}

.json-bracket-close {
    display: block;
}

/* Mobile styles */
@media (max-width: 768px) {
    .json-viewer {
        padding: 12px;
        font-size: 12px;
    }

    .json-toolbar {
        flex-wrap: wrap;
    }

    .json-btn {
        padding: 4px 8px;
        font-size: 11px;
    }
}

/* ========================================
   Edit Mode
   ======================================== */

/* Document editor textarea (mobile) */
.document-editor {
    display: none;
    width: 100%;
    min-height: calc(100vh - 200px);
    max-height: calc(100vh - 160px);
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    resize: none;
    outline: none;
    margin-top: 20px;
    transition: border-color 200ms ease, box-shadow 200ms ease;
    overflow-y: auto;
}

.document-editor:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.document-editor::placeholder {
    color: var(--text-placeholder);
}

/* Edit split view container (PC) */
.document-edit-split-view {
    display: none;
    gap: 24px;
    margin-top: 20px;
    width: 100%;
}

.document.edit-mode .document-edit-split-view {
    display: flex;
    flex: 1;
}

/* Edit wrapper */
.document-edit-wrapper {
    flex: 1;
    min-width: 0;
    overflow: visible;
    max-width: 50%;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 180px);
}

/* Preview wrapper */
.document-preview-wrapper {
    flex: 1;
    min-width: 0;
    overflow: visible;
    max-width: 50%;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 180px);
}

/* Split editor textarea */
.document-editor-split {
    flex: 1;
    width: 100%;
    padding: 16px;
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    resize: none;
    outline: none;
    overflow-y: auto;
    transition: border-color 200ms ease, box-shadow 200ms ease;
}

.document-editor-split:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

/* Preview content in edit mode */
.document-preview-wrapper .document-content {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

/* Hide content views in edit mode */
.document.edit-mode .document-source,
.document.edit-mode .document-source-wrapper,
.document.edit-mode .document-content-wrapper,
.document.edit-mode #documentSplitView,
.document.edit-mode #docContentSingle,
.document.edit-mode #docSourceSingle {
    display: none !important;
}

/* Show preview in edit mode (PC only) */
@media (min-width: 769px) {
    .document.edit-mode .document-preview-wrapper .document-content {
        display: block !important;
    }
}

/* Hide preview wrapper in edit mode on mobile */
@media (max-width: 768px) {
    .document.edit-mode .document-preview-wrapper {
        display: none !important;
    }
}

/* Expand width in edit mode for split view */
.content-wrapper.edit-mode {
    max-width: 100% !important;
    padding: 60px 32px 120px !important;
}

/* Topbar edit mode - hide other buttons, show save and cancel */
.topbar.edit-mode #refreshBtn,
.topbar.edit-mode #deleteBtn,
.topbar.edit-mode #sourceToggle,
.topbar.edit-mode #tocToggle,
.topbar.edit-mode #editBtn {
    display: none !important;
}

.topbar.edit-mode #saveBtn,
.topbar.edit-mode #cancelBtn {
    display: flex !important;
}

/* Mobile edit mode - show simple editor */
@media (max-width: 768px) {
    .document.edit-mode .document-editor {
        display: block !important;
        min-height: calc(100vh - 160px);
        max-height: calc(100vh - 120px);
        padding: 16px;
        font-size: 13px;
        margin-top: 12px;
        border-radius: var(--radius-md);
    }

    .document.edit-mode .document-edit-split-view,
    article.document.edit-mode .document-edit-split-view {
        display: none !important;
    }
}

/* PC edit mode - show split view */
@media (min-width: 769px) {
    .document.edit-mode .document-edit-split-view,
    article.document.edit-mode .document-edit-split-view {
        display: flex !important;
        flex: 1;
    }
}