/* ============================================
   CELL COMPONENT
   ============================================ */

.cell {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-sm);
    position: relative;
    transition: all var(--transition-base);
}

.cell:hover {
    box-shadow: 0 0 0 1px var(--border-medium);
}

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

/* ==========================================
   CELL ACTIONS (Hover buttons)
   ========================================== */

.cell-actions {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 10;
}

.cell-action-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.cell-action-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.cell-action-btn:active {
    transform: scale(0.95);
}

/* ==========================================
   MARKDOWN CELL
   ========================================== */

.markdown-cell {
    padding: var(--spacing-lg) 28px;
}

.markdown-cell h1,
.markdown-cell h2,
.markdown-cell h3,
.markdown-cell h4,
.markdown-cell h5,
.markdown-cell h6 {
    margin-bottom: var(--spacing-md);
}

.markdown-cell p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

.markdown-cell strong {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.markdown-cell em {
    font-style: italic;
}

.markdown-cell code {
    font-family: var(--font-mono);
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--color-magenta);
}

.markdown-cell ul,
.markdown-cell ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.markdown-cell li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

/* ==========================================
   CODE CELL
   ========================================== */

.code-cell {
    border: 1px solid var(--border-light);
}

/* Code Header */
.code-header {
    padding: var(--spacing-sm) 12px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--bg-secondary);
}

.code-header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.code-header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Evaluate Button */
.evaluate-btn {
    background: var(--color-blue);
    color: white;
    border: none;
    padding: 6px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-base);
}

.evaluate-btn:hover {
    background: #2563eb;
}

.evaluate-btn:active {
    transform: scale(0.95);
}

.evaluate-btn.evaluating {
    background: var(--color-orange);
}

/* Code Editor */
.code-editor {
    background: var(--bg-code);
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: var(--font-size-base);
    color: var(--text-code);
    min-height: 120px;
    overflow-x: auto;
}

.code-editor textarea {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-code);
    font-family: var(--font-mono);
    font-size: var(--font-size-base);
    resize: none;
    outline: none;
    line-height: 1.6;
}

.code-line {
    display: flex;
    gap: var(--spacing-md);
}

.line-number {
    color: var(--text-code-comment);
    user-select: none;
    min-width: 30px;
    text-align: right;
}

.line-content {
    flex: 1;
}

/* Syntax Highlighting */
.keyword { color: #c678dd; }
.string { color: #98c379; }
.comment { color: #5c6370; font-style: italic; }
.function { color: #61afef; }
.variable { color: #e06c75; }
.operator { color: #56b6c2; }
.number { color: #d19a66; }

/* Code Output */
.code-output {
    padding: var(--spacing-md);
    background: #fafafa;
    border-top: 1px solid var(--border-light);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--text-primary);
}

.code-output.success {
    background: #f0fdf4;
    color: #166534;
}

.code-output.error {
    background: #fef2f2;
    color: #991b1b;
}

.code-output .output-label {
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.5px;
}

/* ==========================================
   STATUS INDICATORS
   ========================================== */

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.idle {
    background: var(--status-idle);
}

.status-dot.stale {
    background: var(--status-stale);
}

.status-dot.evaluated {
    background: var(--status-evaluated);
}

.status-dot.executing {
    background: var(--status-executing);
    animation: pulse 1.5s ease-in-out infinite;
}

.status-dot.error {
    background: var(--status-error);
}

/* ==========================================
   ADD CELL ZONE
   ========================================== */

.add-cell-zone {
    height: 40px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.add-cell-trigger {
    width: 100%;
    height: 2px;
    background: transparent;
    cursor: pointer;
    position: relative;
    transition: all var(--transition-base);
}

.add-cell-trigger:hover {
    background: var(--border-light);
}

.add-cell-buttons {
    display: none;
    position: absolute;
    gap: var(--spacing-sm);
    background: var(--bg-primary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

.add-cell-trigger:hover + .add-cell-buttons,
.add-cell-buttons:hover {
    display: flex;
}

.add-cell-btn {
    padding: 6px 12px;
    border: 1px solid var(--border-light);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-base);
}

.add-cell-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-medium);
}

/* ==========================================
   ANIMATIONS
   ========================================== */

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}