/* Kanban Board Layout */
.board {
    display: flex;
    gap: 16px;
    padding: 24px;
    min-height: calc(100vh - 65px);
    overflow-x: auto;
}

/* Column */
.column {
    flex: 0 0 320px;
    background-color: var(--column-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 113px);
}

.column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.column-header h2 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.task-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    padding: 0 8px;
    background-color: var(--surface-hover);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.column-content {
    flex: 1;
    padding: 12px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Column-specific colors */
.column[data-column="todo"] .column-header h2 {
    color: var(--text-secondary);
}

.column[data-column="in_progress"] .column-header h2 {
    color: var(--warning-color);
}

.column[data-column="review"] .column-header h2 {
    color: var(--accent-color);
}

.column[data-column="done"] .column-header h2 {
    color: var(--success-color);
}

/* Drop zone styling */
.column-content.drag-over {
    background-color: rgba(88, 166, 255, 0.05);
    border: 2px dashed var(--accent-color);
    border-radius: var(--radius-md);
}

/* Empty column placeholder */
.column-content:empty::after {
    content: 'Drop tasks here';
    display: flex;
    align-items: center;
    justify-content: center;
    height: 80px;
    color: var(--text-secondary);
    font-size: 14px;
    opacity: 0.5;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
}

/* Scrollbar styling */
.column-content::-webkit-scrollbar {
    width: 6px;
}

.column-content::-webkit-scrollbar-track {
    background: transparent;
}

.column-content::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.column-content::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}

/* Responsive - switch to grid when columns don't fit */
@media (max-width: 1400px) {
    .board {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        overflow-x: visible;
    }

    .column {
        flex: none;
        width: 100%;
        max-height: calc(50vh - 80px);
    }
}

@media (max-width: 768px) {
    .board {
        padding: 16px;
        gap: 12px;
        grid-template-columns: 1fr;
    }

    .column {
        max-height: 400px;
    }
}