/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #1e1e1e;
    --bg-secondary: #252525;
    --bg-sidebar: #1a1a1a;
    --text-primary: #dcddde;
    --text-muted: #999999;
    --border-color: #333333;
    --accent-color: #7c3aed;
    --accent-hover: #8b5cf6;
    --link-color: #6d9fff;
    --code-bg: #2d2d2d;
    --code-color: #e879f9;
    --danger-color: #ef4444;
    --success-color: #22c55e;
    --hover-bg: rgba(255, 255, 255, 0.05);
    --active-bg: rgba(124, 58, 237, 0.2);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* ===== LAYOUT ===== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* ===== HEADER ===== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background-color: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-color);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
}

.logo-icon {
    color: var(--accent-color);
}

.current-file {
    font-size: 14px;
    color: var(--text-muted);
    margin-left: 8px;
}

.current-file.modified::before {
    content: "* ";
    color: var(--accent-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s;
}

.btn:hover:not(:disabled) {
    background-color: var(--hover-bg);
}

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

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

.btn-daily {
    background-color: rgba(124, 58, 237, 0.2);
    border-color: var(--accent-color);
    color: var(--accent-hover);
}

.btn-daily:hover:not(:disabled) {
    background-color: var(--accent-color);
    color: white;
}

/* ===== TOOLBAR ===== */
.toolbar {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    gap: 4px;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 2px;
}

.toolbar-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 8px;
}

.toolbar-spacer {
    flex: 1;
}

.toolbar-btn {
    padding: 4px 10px;
    font-size: 13px;
    border: none;
    border-radius: 4px;
    background-color: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.15s;
    min-width: 28px;
}

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

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

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

/* ===== MAIN CONTENT ===== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: 280px;
    min-width: 200px;
    max-width: 500px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: relative;
}

.sidebar-header {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.resize-handle {
    position: absolute;
    right: 0;
    top: 0;
    width: 4px;
    height: 100%;
    cursor: col-resize;
    background-color: transparent;
    transition: background-color 0.2s;
}

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

/* ===== FILE TREE ===== */
.file-item {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    cursor: pointer;
    transition: background-color 0.15s;
}

.file-item:hover {
    background-color: var(--hover-bg);
}

.file-item.active {
    background-color: var(--active-bg);
}

.file-item.folder {
    font-weight: 500;
}

.file-icon {
    margin-right: 6px;
    flex-shrink: 0;
}

.folder-icon {
    color: var(--accent-color);
}

.file-text-icon {
    color: var(--text-muted);
}

.chevron-icon {
    margin-right: 2px;
    color: var(--text-muted);
    transition: transform 0.2s;
    font-size: 10px;
}

.chevron-icon.expanded {
    transform: rotate(90deg);
}

.file-name {
    flex: 1;
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.delete-btn {
    opacity: 0;
    padding: 4px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    transition: opacity 0.15s;
}

.file-item:hover .delete-btn {
    opacity: 1;
}

.delete-btn:hover {
    color: var(--danger-color);
}

.folder-children {
    display: none;
}

.folder-children.expanded {
    display: block;
}

.empty-state {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 32px;
    margin-bottom: 8px;
    opacity: 0.5;
}

/* ===== EDITOR AREA ===== */
.editor-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-wysiwyg {
    flex: 1;
    padding: 24px 40px;
    overflow-y: auto;
    outline: none;
    line-height: 1.7;
    font-size: 15px;
}

.editor-wysiwyg:empty::before {
    content: attr(data-placeholder);
    color: var(--text-muted);
    pointer-events: none;
}

/* ===== WYSIWYG STYLES ===== */
.editor-wysiwyg h1 {
    font-size: 28px;
    font-weight: 700;
    margin: 24px 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.editor-wysiwyg h2 {
    font-size: 22px;
    font-weight: 600;
    margin: 20px 0 12px;
    color: var(--text-primary);
}

.editor-wysiwyg h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 16px 0 8px;
    color: var(--text-primary);
}

.editor-wysiwyg h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 12px 0 6px;
    color: var(--text-primary);
}

.editor-wysiwyg p {
    margin: 8px 0;
}

.editor-wysiwyg strong, .editor-wysiwyg b {
    font-weight: 600;
    color: var(--text-primary);
}

.editor-wysiwyg em, .editor-wysiwyg i {
    font-style: italic;
}

.editor-wysiwyg s, .editor-wysiwyg del {
    text-decoration: line-through;
    color: var(--text-muted);
}

.editor-wysiwyg a {
    color: var(--link-color);
    text-decoration: none;
}

.editor-wysiwyg a:hover {
    text-decoration: underline;
}

.editor-wysiwyg a.wikilink {
    color: var(--accent-color);
    background-color: var(--active-bg);
    padding: 0 4px;
    border-radius: 3px;
    cursor: pointer;
}

.editor-wysiwyg a.wikilink:hover {
    background-color: var(--accent-color);
    color: white;
}

.editor-wysiwyg a.wikilink.missing {
    color: var(--danger-color);
    text-decoration: dashed underline;
}

.editor-wysiwyg ul, .editor-wysiwyg ol {
    margin: 8px 0;
    padding-left: 24px;
}

.editor-wysiwyg li {
    margin: 4px 0;
}

.editor-wysiwyg input[type="checkbox"] {
    margin-right: 8px;
    accent-color: var(--accent-color);
    width: 14px;
    height: 14px;
    cursor: pointer;
}

.editor-wysiwyg li:has(input[type="checkbox"]) {
    list-style: none;
    margin-left: -20px;
}

.editor-wysiwyg blockquote {
    margin: 16px 0;
    padding: 8px 16px;
    border-left: 4px solid var(--accent-color);
    background-color: var(--hover-bg);
    color: var(--text-muted);
}

.editor-wysiwyg code {
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 13px;
    color: var(--code-color);
}

.editor-wysiwyg pre {
    background-color: var(--code-bg);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 16px 0;
}

.editor-wysiwyg pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.editor-wysiwyg hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 24px 0;
}

.editor-wysiwyg div.line {
    min-height: 1.7em;
}

/* Inline markdown syntax (shown while typing) */
.editor-wysiwyg .md-syntax {
    color: var(--text-muted);
    font-family: inherit;
}

/* ===== CODE VIEW ===== */
.code-view {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-left: 1px solid var(--border-color);
}

.panel-header {
    padding: 8px 16px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
}

.editor-textarea {
    flex: 1;
    padding: 16px;
    background-color: transparent;
    border: none;
    outline: none;
    resize: none;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
}

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

/* ===== WELCOME SCREEN ===== */
.welcome-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.welcome-content {
    text-align: center;
}

.welcome-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.welcome-title {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.welcome-text {
    font-size: 14px;
    margin-bottom: 16px;
}

/* ===== STATUS BAR ===== */
.status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 16px;
    font-size: 12px;
    color: var(--text-muted);
    background-color: var(--bg-sidebar);
    border-top: 1px solid var(--border-color);
}

.status-left, .status-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* ===== MESSAGES ===== */
.error-banner {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: rgba(239, 68, 68, 0.1);
    border-bottom: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger-color);
}

.error-banner.visible {
    display: flex;
}

.error-banner .close-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--danger-color);
    cursor: pointer;
    padding: 4px;
}

.success-banner {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: rgba(34, 197, 94, 0.1);
    border-bottom: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--success-color);
}

.success-banner.visible {
    display: flex;
}

.success-banner .close-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--success-color);
    cursor: pointer;
    padding: 4px;
}

/* ===== MODAL ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background-color: var(--bg-secondary);
    padding: 24px;
    border-radius: 12px;
    min-width: 320px;
    max-width: 500px;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.modal-input {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    outline: none;
}

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

.modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

/* ===== UNSUPPORTED BROWSER ===== */
.unsupported-browser {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    padding: 24px;
}

.unsupported-content {
    max-width: 400px;
    text-align: center;
    background-color: var(--bg-secondary);
    padding: 32px;
    border-radius: 12px;
}

.unsupported-icon {
    font-size: 48px;
    color: var(--danger-color);
    margin-bottom: 16px;
}

.unsupported-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
}

.unsupported-text {
    color: var(--text-muted);
    line-height: 1.6;
}

/* ===== UTILITIES ===== */
.hidden {
    display: none !important;
}

/* ===== SELECTION ===== */
::selection {
    background-color: rgba(124, 58, 237, 0.3);
}

/* ===== DRAG AND DROP ===== */
.file-item[draggable="true"] {
    cursor: grab;
}

.file-item[draggable="true"]:active {
    cursor: grabbing;
}

.file-item[draggable="true"]:hover {
    background-color: var(--hover-bg);
}

.editor-wysiwyg {
    cursor: text;
}

/* Drop indicator */
.editor-wysiwyg.drag-over {
    background-color: rgba(124, 58, 237, 0.05);
}

/* ===== SEARCH MODAL ===== */
.search-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 80px;
    z-index: 2000;
}

.search-modal.hidden {
    display: none;
}

.search-modal-content {
    width: 600px;
    max-width: 90%;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.search-icon {
    font-size: 20px;
    margin-right: 12px;
    opacity: 0.5;
}

.search-input {
    flex: 1;
    background: none;
    border: none;
    font-size: 18px;
    color: var(--text-primary);
    outline: none;
}

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

.search-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
}

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

.search-results {
    max-height: 400px;
    overflow-y: auto;
}

.search-empty {
    padding: 40px;
    text-align: center;
    color: var(--text-muted);
}

.search-loading {
    padding: 40px;
    text-align: center;
    color: var(--text-muted);
}

.search-result {
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.15s;
}

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

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

.search-result-file {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.search-result-file::before {
    content: '📄';
    font-size: 12px;
}

.search-result-context {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

.search-highlight {
    background-color: var(--accent-color);
    color: white;
    padding: 1px 4px;
    border-radius: 3px;
}

.search-no-results {
    padding: 40px;
    text-align: center;
    color: var(--text-muted);
}

.search-footer {
    display: flex;
    justify-content: center;
    gap: 24px;
    padding: 10px 16px;
    background-color: var(--bg-sidebar);
    font-size: 12px;
    color: var(--text-muted);
}

.search-footer span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ===== BACKLINKS PANEL ===== */
.backlinks-panel {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    max-height: 200px;
    display: flex;
    flex-direction: column;
}

.backlinks-panel.hidden {
    display: none;
}

.backlinks-panel.collapsed .backlinks-content {
    display: none;
}

.backlinks-panel.collapsed .backlinks-chevron {
    transform: rotate(-90deg);
}

.backlinks-header {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    background-color: var(--bg-sidebar);
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    user-select: none;
}

.backlinks-header:hover {
    background-color: var(--hover-bg);
}

.backlinks-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}

.backlinks-toggle input[type="checkbox"] {
    accent-color: var(--accent-color);
    width: 14px;
    height: 14px;
    cursor: pointer;
}

.backlinks-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.backlinks-count {
    font-size: 12px;
    color: var(--text-muted);
    background-color: var(--hover-bg);
    padding: 2px 8px;
    border-radius: 10px;
    margin-left: auto;
}

.backlinks-chevron {
    font-size: 10px;
    color: var(--text-muted);
    margin-left: 8px;
    transition: transform 0.2s;
}

.backlinks-content {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.backlinks-empty {
    padding: 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.backlinks-loading {
    padding: 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.backlink-item {
    padding: 8px 16px;
    cursor: pointer;
    transition: background-color 0.15s;
}

.backlink-item:hover {
    background-color: var(--hover-bg);
}

.backlink-file {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}

.backlink-file::before {
    content: '📄';
    font-size: 12px;
}

.backlink-context {
    font-size: 12px;
    color: var(--text-muted);
    padding-left: 20px;
    line-height: 1.4;
}