/* ============================================
   Block-Based Editor - Notion Style
   Pure Vanilla CSS
   ============================================ */

:root {
    /* Notion-inspired Color Palette */
    --editor-bg: #ffffff;
    --editor-sidebar-bg: #f7f6f3;
    --editor-text: #37352f;
    --editor-text-light: #787774;
    --editor-border: #e9e9e7;
    --editor-hover: #f1f1ef;
    --editor-active: #2383e2;
    --editor-shadow: rgba(15, 15, 15, 0.05);

    /* Block Colors */
    --block-hint-bg: #fff7e6;
    --block-hint-border: #ffc078;
    --block-quote-border: #d3d3d3;
    --block-code-bg: #f7f6f3;
    --block-todo-checked: #9b9a97;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-serif: 'Georgia', 'Times New Roman', serif;
    --font-mono: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', 'Courier New', monospace;
}

/* ============================================
   Main Layout
   ============================================ */

.block-editor {
    display: grid;
    grid-template-columns: 300px 1fr;
    height: 100vh;
    font-family: var(--font-sans);
    background-color: var(--editor-bg);
    color: var(--editor-text);
    overflow: hidden;
}

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

.editor-sidebar {
    background-color: var(--editor-sidebar-bg);
    border-right: 1px solid var(--editor-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    height: 100vh;
}

.sidebar-header {
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid var(--editor-border);
    flex-shrink: 0;
}

.sidebar-header h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 14px;
    font-weight: 600;
    color: var(--editor-text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-new-page {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: 1px solid var(--editor-border);
    border-radius: 4px;
    color: var(--editor-text);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
}

.btn-new-page:hover {
    background-color: var(--editor-hover);
}

.pages-tree {
    flex: 1;
    padding: var(--spacing-sm) 0;
}

.page-item {
    cursor: pointer;
    transition: background-color 0.15s;
    user-select: none;
}

.page-item:hover {
    background-color: var(--editor-hover);
}

.page-item.active {
    background-color: var(--editor-hover);
}

.page-item.active .page-title {
    font-weight: 600;
}

.page-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    position: relative;
}

.page-toggle,
.page-spacer {
    width: 16px;
    font-size: 10px;
    color: var(--editor-text-light);
    transition: transform 0.2s;
}

.page-toggle:hover {
    color: var(--editor-text);
}

.page-icon {
    font-size: 16px;
    line-height: 1;
}

.page-title {
    flex: 1;
    font-size: 14px;
    color: var(--editor-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.page-actions {
    opacity: 0;
    transition: opacity 0.2s;
    display: flex;
    gap: var(--spacing-xs);
}

.page-item:hover .page-actions {
    opacity: 1;
}

.btn-delete-page {
    width: 20px;
    height: 20px;
    padding: 0;
    background-color: transparent;
    border: none;
    border-radius: 3px;
    color: var(--editor-text-light);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-delete-page:hover {
    background-color: rgba(255, 0, 0, 0.1);
    color: #ff0000;
}

/* ============================================
   Spaces Feature
   ============================================ */

.spaces-list {
    flex: 1;
    padding: var(--spacing-sm) 0;
}

.space-item {
    margin-bottom: var(--spacing-xs);
}

.space-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    cursor: pointer;
    transition: background-color 0.15s;
    user-select: none;
    position: relative;
}

.space-header:hover {
    background-color: var(--editor-hover);
}

.space-toggle {
    width: 16px;
    font-size: 10px;
    color: var(--editor-text-light);
    transition: transform 0.2s;
    flex-shrink: 0;
}

.space-item.expanded .space-toggle {
    transform: rotate(90deg);
}

.space-toggle:hover {
    color: var(--editor-text);
}

.space-icon {
    font-size: 16px;
    line-height: 1;
    flex-shrink: 0;
}

.space-name {
    flex: 1;
    font-size: 14px;
    font-weight: 600;
    color: var(--editor-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.space-shared-info {
    font-size: 11px;
    color: var(--editor-text-light);
    font-weight: normal;
    margin-left: var(--spacing-xs);
}

.space-actions {
    opacity: 0;
    transition: opacity 0.2s;
    display: flex;
    gap: var(--spacing-xs);
}

.space-header:hover .space-actions {
    opacity: 1;
}

.btn-share-space,
.btn-delete-space {
    width: 20px;
    height: 20px;
    padding: 0;
    background-color: transparent;
    border: none;
    border-radius: 3px;
    color: var(--editor-text-light);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-share-space:hover {
    background-color: rgba(35, 131, 226, 0.1);
    color: var(--editor-active);
}

.btn-delete-space:hover {
    background-color: rgba(255, 0, 0, 0.1);
    color: #ff0000;
}

.space-pages {
    display: none;
    padding-left: var(--spacing-md);
}

.space-item.expanded .space-pages {
    display: block;
}

.btn-new-space {
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: transparent;
    border: 1px dashed var(--editor-border);
    border-radius: 4px;
    color: var(--editor-text-light);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: left;
    margin-top: var(--spacing-sm);
}

.btn-new-space:hover {
    background-color: var(--editor-hover);
    border-color: var(--editor-text-light);
}

.btn-rename-page,
.btn-duplicate-page {
    width: 20px;
    height: 20px;
    padding: 0;
    background-color: transparent;
    border: none;
    border-radius: 3px;
    color: var(--editor-text-light);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-rename-page:hover {
    background-color: rgba(35, 131, 226, 0.1);
    color: var(--editor-active);
}

.btn-duplicate-page:hover {
    background-color: rgba(120, 119, 116, 0.1);
    color: var(--editor-text);
}

/* Page drag and drop states */
.page-item.dragging {
    opacity: 0.5;
}

.page-item.drag-over {
    background-color: rgba(35, 131, 226, 0.1);
    border-left: 3px solid var(--editor-active);
}

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

.editor-main {
    overflow-y: auto;
    overflow-x: hidden;
    height: 100vh;
    position: relative;
}

.editor-content {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) 96px;
    min-height: 100%;
}

/* ============================================
   Page Header
   ============================================ */

.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-icon-picker {
    font-size: 78px;
    line-height: 1;
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    display: inline-block;
    padding: var(--spacing-sm);
    border-radius: 4px;
    transition: background-color 0.15s;
}

.page-icon-picker:hover {
    background-color: var(--editor-hover);
}

.page-icon-picker:focus {
    outline: none;
    background-color: var(--editor-hover);
}

.page-title-input {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    margin: 0;
    color: var(--editor-text);
    border: none;
    outline: none;
    width: 100%;
}

.page-title-input:empty:before {
    content: attr(data-placeholder);
    color: var(--editor-text-light);
    opacity: 0.4;
}

.page-title-input:focus {
    outline: none;
}

/* ============================================
   Blocks Container
   ============================================ */

.blocks-container {
    margin-bottom: var(--spacing-lg);
}

.block {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: 2px;
    padding: 3px 0;
    position: relative;
    transition: background-color 0.15s;
}

.block:hover {
    background-color: rgba(0, 0, 0, 0.01);
}

.block.dragging {
    opacity: 0.5;
}

.block.drag-over {
    border-top: 2px solid var(--editor-active);
}

.block-handle {
    width: 24px;
    color: var(--editor-text-light);
    font-size: 12px;
    cursor: grab;
    opacity: 0;
    transition: opacity 0.15s;
    user-select: none;
    display: flex;
    align-items: flex-start;
    padding-top: 3px;
}

.block:hover .block-handle {
    opacity: 1;
}

.block-handle:active {
    cursor: grabbing;
}

.block-content {
    flex: 1;
    min-width: 0;
}

.block-actions {
    opacity: 0;
    transition: opacity 0.15s;
}

.block:hover .block-actions {
    opacity: 1;
}

.btn-delete-block {
    width: 24px;
    height: 24px;
    padding: 0;
    background-color: transparent;
    border: none;
    border-radius: 3px;
    color: var(--editor-text-light);
    font-size: 20px;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-delete-block:hover {
    background-color: rgba(255, 0, 0, 0.1);
    color: #ff0000;
}

/* ============================================
   Block Text Elements
   ============================================ */

.block-text {
    outline: none;
    width: 100%;
    padding: 3px 2px;
    margin: 0;
    line-height: 1.5;
    color: var(--editor-text);
}

.block-text:empty:before {
    content: attr(data-placeholder);
    color: var(--editor-text-light);
    opacity: 0.4;
}

.block-text:focus {
    outline: none;
}

/* Headings */
.block-heading1 .block-text,
.block-text h1 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
    margin: 8px 0;
}

.block-heading2 .block-text,
.block-text h2 {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.3;
    margin: 6px 0;
}

.block-heading3 .block-text,
.block-text h3 {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.3;
    margin: 4px 0;
}

/* Lists */
.block-bullet-list ul,
.block-numbered-list ol {
    margin: 0;
    padding-left: 24px;
}

.block-bullet-list li,
.block-numbered-list li {
    margin: 2px 0;
}

/* ============================================
   Specialized Block Types
   ============================================ */

/* To-do */
.todo-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.todo-checkbox {
    margin-top: 4px;
    cursor: pointer;
    flex-shrink: 0;
}

.todo-item .block-text.checked {
    text-decoration: line-through;
    color: var(--block-todo-checked);
}

/* Toggle */
.toggle-item {
    display: flex;
    gap: var(--spacing-sm);
}

.toggle-arrow {
    cursor: pointer;
    user-select: none;
    flex-shrink: 0;
    transition: transform 0.2s;
    width: 20px;
    color: var(--editor-text-light);
}

.toggle-arrow.expanded {
    transform: rotate(90deg);
}

.toggle-arrow:hover {
    color: var(--editor-text);
}

.toggle-content {
    flex: 1;
}

.toggle-children {
    margin-top: var(--spacing-sm);
    padding-left: var(--spacing-lg);
    border-left: 2px solid var(--editor-border);
    color: var(--editor-text-light);
}

/* Checklist */
.checklist-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.checklist-option,
.radio-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
}

.checklist-option input,
.radio-option input {
    cursor: pointer;
}

.btn-add-checklist-item,
.btn-add-radio-option {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: transparent;
    border: 1px dashed var(--editor-border);
    border-radius: 3px;
    color: var(--editor-text-light);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-add-checklist-item:hover,
.btn-add-radio-option:hover {
    border-color: var(--editor-text-light);
    background-color: var(--editor-hover);
}

/* Divider */
.block-divider {
    border: none;
    border-top: 1px solid var(--editor-border);
    margin: var(--spacing-md) 0;
}

/* Hint */
.block-hint {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--block-hint-bg);
    border-left: 3px solid var(--block-hint-border);
    border-radius: 4px;
}

.hint-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.block-hint .block-text {
    flex: 1;
    padding: 0;
}

/* Quote */
.block-quote {
    margin: 0;
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 3px solid var(--block-quote-border);
    font-size: 16px;
    color: var(--editor-text-light);
    font-style: italic;
}

/* Image */
.block-image {
    margin: var(--spacing-md) 0;
}

.block-image img {
    max-width: 100%;
    border-radius: 4px;
    display: block;
}

.image-placeholder {
    padding: var(--spacing-xl);
    border: 2px dashed var(--editor-border);
    border-radius: 8px;
    text-align: center;
    color: var(--editor-text-light);
    cursor: pointer;
    transition: all 0.15s;
}

.image-placeholder:hover {
    border-color: var(--editor-text-light);
    background-color: var(--editor-hover);
}

.image-placeholder span {
    display: block;
    font-size: 32px;
    margin-bottom: var(--spacing-sm);
}

.image-controls {
    margin-top: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.image-url-input,
.image-alt-input {
    padding: var(--spacing-sm);
    border: 1px solid var(--editor-border);
    border-radius: 4px;
    font-size: 13px;
    font-family: var(--font-mono);
}

.image-url-input:focus,
.image-alt-input:focus {
    outline: none;
    border-color: var(--editor-active);
}

/* Button */
.block-button-container {
    margin: var(--spacing-md) 0;
}

.block-button {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--editor-active);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.15s;
}

.block-button:hover {
    background-color: #1a6ec0;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(35, 131, 226, 0.3);
}

.block-button.secondary {
    background-color: #6c757d;
}

.block-button.secondary:hover {
    background-color: #5a6268;
}

.button-controls {
    margin-top: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.button-text-input,
.button-url-input {
    padding: var(--spacing-sm);
    border: 1px solid var(--editor-border);
    border-radius: 4px;
    font-size: 13px;
}

.button-text-input:focus,
.button-url-input:focus {
    outline: none;
    border-color: var(--editor-active);
}

/* Table */
.block-table {
    margin: var(--spacing-md) 0;
    overflow-x: auto;
}

.block-table table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--editor-border);
}

.block-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--editor-border);
    min-width: 100px;
    vertical-align: top;
}

.block-table td:focus {
    outline: 2px solid var(--editor-active);
    outline-offset: -2px;
}

.table-controls {
    margin-top: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-sm);
}

.btn-add-row,
.btn-add-col {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: transparent;
    border: 1px dashed var(--editor-border);
    border-radius: 3px;
    color: var(--editor-text-light);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-add-row:hover,
.btn-add-col:hover {
    border-color: var(--editor-text-light);
    background-color: var(--editor-hover);
}

/* Code Block */
.block-code {
    margin: var(--spacing-md) 0;
    background-color: var(--block-code-bg);
    border-radius: 4px;
    overflow: hidden;
}

.code-language-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-bottom: 1px solid var(--editor-border);
    background-color: rgba(0, 0, 0, 0.02);
    font-size: 12px;
    font-family: var(--font-mono);
    cursor: pointer;
}

.block-code pre {
    margin: 0;
    padding: var(--spacing-md);
    overflow-x: auto;
}

.block-code code {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--editor-text);
}

.block-code code:focus {
    outline: none;
}

.mermaid-diagram {
    padding: var(--spacing-lg);
}

.mermaid-placeholder {
    color: var(--editor-text-light);
    text-align: center;
    padding: var(--spacing-xl);
}

/* ============================================
   Block Menu (Slash Commands)
   ============================================ */

.block-menu {
    position: absolute;
    background-color: white;
    border: 1px solid var(--editor-border);
    border-radius: 6px;
    box-shadow: 0 8px 24px var(--editor-shadow);
    min-width: 200px;
    max-height: 400px;
    overflow-y: auto;
    z-index: 1000;
    padding: var(--spacing-xs) 0;
}

.block-menu-item {
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    font-size: 14px;
    color: #1f2937;
    transition: background-color 0.15s;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}
.block-menu-item span { color: inherit; }

.block-menu-item:hover {
    background-color: var(--editor-hover);
}

/* ============================================
   Add Block Trigger
   ============================================ */

.add-block-trigger {
    padding: var(--spacing-md);
    color: var(--editor-text-light);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.15s;
    text-align: center;
    border: 1px dashed transparent;
}

.add-block-trigger:hover {
    background-color: var(--editor-hover);
    border-color: var(--editor-border);
    color: var(--editor-text);
}

/* ============================================
   Access Denied
   ============================================ */

.access-denied {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--editor-text-light);
}

.access-denied-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-lg);
}

.access-denied h2 {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--editor-text);
}

.access-denied p {
    margin: 0;
}

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

.editor-sidebar::-webkit-scrollbar,
.editor-main::-webkit-scrollbar,
.block-menu::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.editor-sidebar::-webkit-scrollbar-track,
.editor-main::-webkit-scrollbar-track,
.block-menu::-webkit-scrollbar-track {
    background-color: transparent;
}

.editor-sidebar::-webkit-scrollbar-thumb,
.editor-main::-webkit-scrollbar-thumb,
.block-menu::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.15);
    border-radius: 3px;
}

.editor-sidebar::-webkit-scrollbar-thumb:hover,
.editor-main::-webkit-scrollbar-thumb:hover,
.block-menu::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.25);
}

/* ============================================
   Selection Styling
   ============================================ */

::selection {
    background-color: rgba(35, 131, 226, 0.3);
}

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

@media (max-width: 1024px) {
    .block-editor {
        grid-template-columns: 250px 1fr;
    }

    .editor-content {
        padding: var(--spacing-xl) var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    .block-editor {
        grid-template-columns: 1fr;
        grid-template-rows: 200px 1fr;
    }

    .editor-sidebar {
        border-right: none;
        border-bottom: 1px solid var(--editor-border);
        height: 200px;
    }

    .editor-main {
        height: calc(100vh - 200px);
    }

    .editor-content {
        padding: var(--spacing-lg);
    }

    .page-icon-picker {
        font-size: 48px;
    }

    .page-title-input {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .editor-content {
        padding: var(--spacing-md);
    }

    .page-header {
        margin-bottom: var(--spacing-lg);
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .editor-sidebar,
    .block-handle,
    .block-actions,
    .page-actions,
    .add-block-trigger {
        display: none !important;
    }

    .editor-main {
        overflow: visible;
    }

    .editor-content {
        max-width: 100%;
        padding: 0;
    }

    .block {
        page-break-inside: avoid;
    }
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
    display: none !important;
}

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