/**
 * Admin Task Editor & List Styles
 * Styles for Phase 1: Admin Task Management
 */

/* ===== Task List Page ===== */

.admin-task-list-page {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--color-text-light);
}

/* Search & Filter Bar */
.task-search-bar {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 300px;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
}

.filter-select {
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: white;
    cursor: pointer;
}

/* Task List */
.task-list {
    display: grid;
    gap: 1.5rem;
}

.task-card {
    padding: 1.5rem;
    transition: all var(--transition-fast);
}

.task-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Task Preview */
.task-preview {
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--color-bg-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.task-preview-text {
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.6;
}

/* Task Metadata */
.task-meta {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.badge {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-subject {
    background: #dbeafe;
    color: #1e40af;
}

.badge-topic {
    background: #fef3c7;
    color: #92400e;
}

.badge-afb {
    background: #dcfce7;
    color: #166534;
}

.badge-difficulty {
    background: #fce7f3;
    color: #9f1239;
}

/* Task Stats */
.task-stats {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
    color: var(--color-text-light);
}

/* Task Actions */
.task-actions {
    display: flex;
    gap: 0.5rem;
}


/* ===== Task Editor Page ===== */

.task-editor-page {
    max-width: 1800px;
    margin: 0 auto;
    padding: 2rem;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.editor-header h1 {
    margin: 0;
}

/* Editor Grid (Split View) */
.editor-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.editor-panel,
.preview-panel {
    padding: 1.5rem;
    max-height: 800px;
    overflow-y: auto;
}

.editor-panel h3,
.preview-panel h3 {
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--color-primary);
}


/* ===== Shared Components ===== */

/* LaTeX Input Field */
.latex-input-field {
    margin-bottom: 1.5rem;
}

.field-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.latex-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
}

.latex-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.latex-preview {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--color-bg-light);
    border-radius: var(--radius-sm);
}

.preview-content {
    margin-top: 0.5rem;
}

.preview-text {
    font-size: 0.95rem;
    color: var(--color-text);
}

/* Multiple Choice Editor */
.multiple-choice-editor {
    margin-bottom: 1.5rem;
}

.choice-field {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.choice-label {
    min-width: 160px;
    font-weight: 500;
    font-size: 0.9rem;
}

.correct-label {
    color: var(--color-success);
}

.distractor-label {
    color: var(--color-error);
}

.choice-input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.choice-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Metadata Selector */
.metadata-selector {
    margin-bottom: 1.5rem;
}

.metadata-heading {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.metadata-field {
    margin-bottom: 1rem;
}

.afb-buttons,
.difficulty-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.afb-btn,
.difficulty-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: white;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.afb-btn:hover,
.difficulty-btn:hover {
    border-color: var(--color-primary);
    background: #eff6ff;
}

.afb-btn.active,
.difficulty-btn.active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

.metadata-select,
.metadata-input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.metadata-select:focus,
.metadata-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Task Preview Panel */
.task-preview-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.preview-section {
    margin-bottom: 1rem;
}

.preview-section-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-light);
}

.preview-box {
    padding: 1rem;
    background: var(--color-bg-light);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
}

.choice-preview {
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    border-radius: var(--radius-sm);
}

.correct-choice {
    background: #f0fdf4;
    color: var(--color-success);
}

.distractor-choice {
    background: #fef2f2;
    color: var(--color-error);
}

.metadata-preview {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preview-empty {
    padding: 2rem;
    text-align: center;
    color: var(--color-text-light);
}

/* Task Diff View */
.task-diff-view {
    margin: 1rem 0;
    max-height: 400px;
    overflow-y: auto;
}

.diff-heading {
    margin-bottom: 1rem;
}

.no-changes {
    color: var(--color-success);
    font-style: italic;
}

.diff-section {
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--color-bg-light);
    border-radius: var(--radius-sm);
}

.diff-field-name {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.diff-old,
.diff-new {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.diff-label {
    font-weight: 600;
    min-width: 50px;
}

.diff-old .diff-label {
    color: var(--color-error);
}

.diff-new .diff-label {
    color: var(--color-success);
}

.diff-code {
    flex: 1;
    padding: 0.5rem;
    background: white;
    border-radius: var(--radius-sm);
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    white-space: pre-wrap;
    word-break: break-word;
}


/* ===== Editor Actions ===== */

.editor-actions {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-top: 1px solid var(--color-border);
    position: sticky;
    bottom: 0;
}


/* ===== Modal (Confirmation Dialog) ===== */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    cursor: pointer;
}

.modal-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: 2rem;
    max-width: 700px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    cursor: default;
}

.modal-content h3 {
    margin-top: 0;
    margin-bottom: 1rem;
}

.warning-text {
    margin: 1rem 0;
    padding: 1rem;
    background: #fef3c7;
    border-left: 4px solid #f59e0b;
    border-radius: var(--radius-sm);
}

.dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}


/* ===== Loading & Error States ===== */

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.error-page {
    max-width: 600px;
    margin: 4rem auto;
    padding: 2rem;
    text-align: center;
}

.alert {
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.alert-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

.empty-state {
    text-align: center;
    padding: 3rem;
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}


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

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

    .editor-panel,
    .preview-panel {
        max-height: none;
    }

    .task-search-bar {
        flex-direction: column;
    }

    .search-input {
        width: 100%;
        min-width: 0;
    }
}

@media (max-width: 768px) {
    .admin-task-list-page,
    .task-editor-page {
        padding: 1rem;
    }

    .editor-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .modal-content {
        margin: 1rem;
        max-width: calc(100% - 2rem);
    }
}