/* ============================================
   WORKSPACE LAYOUT
   ============================================ */

.workspace-container {
    display: grid;
    grid-template-columns: 250px 1fr 300px;
    gap: 0;
    height: calc(100vh - 100px);
    margin: 0;
    background: var(--color-bg);
}

/* ============================================
   SIDEBAR - File Tree
   ============================================ */

.workspace-sidebar {
    background: var(--color-bg-alt);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.sidebar-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    margin: 0;
    color: var(--color-text);
}

.sidebar-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    width: 100%;
}

.sidebar-controls .btn {
    white-space: nowrap;
    font-size: 0.7rem;
    padding: 0.375rem 0.5rem;
}

.file-tree {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.file-tree-item {
    padding: 0.5rem;
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    transition: background 0.2s;
}

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

.file-tree-item.active {
    background: var(--color-primary);
    color: white;
}

.file-tree-item .icon {
    font-size: 1rem;
}

.empty-state {
    padding: 2rem 1rem;
    text-align: center;
    color: var(--color-text-muted);
}

.empty-state p {
    margin: 0.5rem 0;
}


/* ============================================
   FRONTMATTER EDITOR
   ============================================ */

.frontmatter-editor {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg-tertiary);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
    margin-bottom: 0;
    overflow: hidden;
}

.frontmatter-editor:not(.collapsed) {
    margin-bottom: 1rem;
}

.fm-header {
    padding: 0.5rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    background: var(--color-bg-secondary);
}

.fm-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin: 0;
    color: var(--color-text);
}

.fm-header .icon {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.fm-header:hover .icon {
    color: var(--color-text);
}

.fm-body {
    padding: 1rem;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-alt);
    max-height: clamp(240px, 45vh, 520px);
    overflow-y: auto;
}

.fm-body::-webkit-scrollbar {
    width: 8px;
}

.fm-body::-webkit-scrollbar-thumb {
    background-color: rgba(107, 114, 128, 0.6);
    border-radius: 4px;
}

.fm-body::-webkit-scrollbar-thumb:hover {
    background-color: rgba(55, 65, 81, 0.7);
}

.fm-form {
    display: grid;
    gap: 1rem;
}

.fm-field {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.fm-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

.fm-label.required::after {
    content: ' *';
    color: #dc3545;
}

.fm-label.recommended::after {
    content: ' (recommended)';
    color: var(--color-text-muted);
    font-weight: 400;
    font-size: 0.75rem;
}

.fm-input {
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 0.875rem;
    font-family: inherit;
}

.fm-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

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

.fm-counter {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-align: right;
}

.fm-counter.warning {
    color: #ffc107;
}

.fm-help {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* Tags Input */
.fm-tags-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-bg);
    min-height: 2.5rem;
}

.fm-tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.fm-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background: var(--color-primary);
    color: white;
    border-radius: 12px;
    font-size: 0.75rem;
}

.fm-tag-remove {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0;
    font-size: 1rem;
    line-height: 1;
}

.fm-tag-remove:hover {
    opacity: 0.8;
}

.fm-tags-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--color-text);
    font-size: 0.875rem;
    min-width: 120px;
}

/* Checkbox Group */
.fm-checkbox-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.fm-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.fm-checkbox input[type="checkbox"] {
    cursor: pointer;
}

/* Status Wrapper */
.fm-status-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.fm-status-wrapper .status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
}

.fm-status-wrapper .status-badge.published {
    background: rgba(40, 167, 69, 0.15);
    color: #28a745;
}

.fm-status-wrapper .status-badge.draft {
    background: rgba(255, 193, 7, 0.15);
    color: #ffc107;
}

.fm-status-wrapper .status-badge.archived {
    background: rgba(108, 117, 125, 0.15);
    color: #6c757d;
}

/* Optional Fields Section */
.fm-section {
    border-top: 1px solid var(--color-border);
    padding-top: 1rem;
}

.fm-section-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem 0;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    width: 100%;
    text-align: left;
}

.fm-section-toggle:hover {
    color: var(--color-primary);
}

.fm-section-toggle .icon {
    font-size: 0.75rem;
}

.fm-section-body {
    display: grid;
    gap: 1rem;
    padding-top: 1rem;
}

.fm-section-body[hidden] {
    display: none !important;
}

/* ============================================
   MAIN PANEL - Editor/Preview
   ============================================ */

.workspace-main {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--color-bg);
}

.workspace-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-alt);
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.tab-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    background: var(--color-bg);
}

.workspace-content {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.panel {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: none;
    flex-direction: column;
}

.panel.active {
    display: flex;
}

.panel-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-bg-alt);
}

.file-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

.panel-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.status-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.status-badge.valid {
    background: rgba(40, 167, 69, 0.15);
    color: #28a745;
}

.status-badge.invalid {
    background: rgba(220, 53, 69, 0.15);
    color: #dc3545;
}

/* ============================================
   EDITOR
   ============================================ */

.editor-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.empty-editor {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-text-muted);
}

#editor {
    height: 100%;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 14px;
}

/* ============================================
   PREVIEW
   ============================================ */

.preview-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem 1.5rem;
    background: var(--color-bg);
    color: var(--color-text);
}

.preview-content {
    max-width: 800px;
    margin: 0 auto;
}

/* Preview Frontmatter Table */
.preview-frontmatter {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.preview-frontmatter h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin: 0 0 1rem 0;
}

.frontmatter-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.frontmatter-table tbody tr {
    border-bottom: 1px solid var(--color-border);
}

.frontmatter-table tbody tr:last-child {
    border-bottom: none;
}

.frontmatter-table td {
    padding: 0.5rem 0;
    vertical-align: top;
}

.fm-key {
    font-weight: 600;
    color: var(--color-text);
    width: 30%;
    padding-right: 1rem;
}

.fm-value {
    color: var(--color-text-secondary);
    word-break: break-word;
}

/* Preview Body Styling */
.preview-body {
    font-size: 1rem;
    line-height: 1.8;
}

.preview-body h1 {
    font-size: 2rem;
    font-weight: 700;
    margin: 1.5rem 0 1rem 0;
    line-height: 1.2;
}

.preview-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 1.5rem 0 0.75rem 0;
    line-height: 1.3;
}

.preview-body h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 1.25rem 0 0.5rem 0;
    line-height: 1.3;
}

.preview-body h4,
.preview-body h5,
.preview-body h6 {
    font-weight: 600;
    margin: 1rem 0 0.5rem 0;
}

.preview-body p {
    margin: 0.75rem 0;
}

.preview-body ul,
.preview-body ol {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
}

.preview-body li {
    margin: 0.375rem 0;
}

.preview-body code {
    background: var(--color-bg-secondary);
    color: var(--color-text);
    padding: 0.125rem 0.5rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
}

.preview-body pre {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1rem 0;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.5;
}

.preview-body pre code {
    background: none;
    padding: 0;
    border-radius: 0;
    color: inherit;
}

.preview-body blockquote {
    border-left: 4px solid var(--color-primary);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

.preview-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.9rem;
}

.preview-body th,
.preview-body td {
    border: 1px solid var(--color-border);
    padding: 0.75rem;
    text-align: left;
}

.preview-body th {
    background: var(--color-bg-secondary);
    font-weight: 600;
}

.preview-body a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
}

.preview-body a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

.preview-error {
    padding: 1rem;
    background: rgba(220, 53, 69, 0.15);
    border: 1px solid rgba(220, 53, 69, 0.3);
    border-radius: 6px;
    color: var(--color-text);
}

.preview-error h4 {
    margin: 0 0 0.5rem 0;
    color: #dc3545;
}

/* ============================================
   ACTIONS PANEL
   ============================================ */

.workspace-actions {
    background: var(--color-bg-alt);
    border-left: 1px solid var(--color-border);
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.action-section {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 1rem;
    background: var(--color-bg);
}

.action-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin: 0 0 1rem 0;
    color: var(--color-text);
}

.validation-results {
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.validation-error {
    padding: 0.5rem;
    background: rgba(220, 53, 69, 0.15);
    border-left: 3px solid #dc3545;
    margin-bottom: 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--color-text);
}

.build-status {
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.build-progress {
    margin-top: 1rem;
}

.progress-bar {
    height: 8px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: var(--color-primary);
    transition: width 0.3s;
    width: 0%;
}

.progress-text {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin: 0;
}

.build-output {
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-bg-secondary);
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

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

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

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

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

.btn-success {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

.btn-success:hover:not(:disabled) {
    background: #218838;
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ============================================
   MODAL
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal[hidden] {
    display: none;
}

.modal-content {
    background: var(--color-bg);
    color: var(--color-text);
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.panel-header {
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-name {
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: background 0.2s;
    flex: 1;
}

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

.file-name.editing {
    padding: 0;
}

.file-name input {
    width: 100%;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--color-primary);
    border-radius: 4px;
    font-size: 1rem;
    background: var(--color-bg);
    color: var(--color-text);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.125rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 0;
    width: 2rem;
    height: 2rem;
}

.modal-body {
    padding: 1.5rem;
}

.upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.2s;
}

.upload-zone.drag-over {
    border-color: var(--color-primary);
    background: var(--color-bg-alt);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* ============================================
   UTILITIES
   ============================================ */

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

.text-sm {
    font-size: 0.75rem;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
    .workspace-container {
        grid-template-columns: 200px 1fr 250px;
    }
}

@media (max-width: 768px) {
    .workspace-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
    }
    
    .workspace-sidebar,
    .workspace-actions {
        display: none;
    }
    
    /* Show as tabs on mobile */
    .workspace-sidebar.active,
    .workspace-actions.active {
        display: flex;
    }
}

/* ============================================
   CSS VARIABLES (fallback)
   ============================================ */

/* Dark mode support for workspace */
@media (prefers-color-scheme: dark) {
    .preview-content {
        color: var(--color-text);
    }
    
    .status-badge.valid {
        background: rgba(40, 167, 69, 0.2);
    }
    
    .status-badge.invalid {
        background: rgba(220, 53, 69, 0.2);
    }
    
    .validation-error {
        background: rgba(220, 53, 69, 0.2);
    }
}