.board-columns {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 1rem;
    min-height: calc(100vh - 280px);
}

.board-columns.hidden {
    display: none;
}

.board-column {
    flex: 1 1 280px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
}

.column-header {
    padding: 0.4rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.column-header h4 {
    font-size: 0.75rem;
    color: var(--text-primary);
}

.column-count {
    background: var(--bg-tertiary);
    padding: 0.1rem 0.4rem;
    border-radius: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.column-cards {
    flex: 1;
    padding: 0.35rem;
    overflow-y: auto;
    min-height: 80px;
}

.column-cards.drag-over {
    background: var(--bg-tertiary);
}

.req-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.4rem 0.5rem;
    margin-bottom: 0.35rem;
    cursor: grab;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.req-card:hover {
    border-color: var(--accent-blue);
}

.req-card.blocked {
    border-color: var(--accent-red);
    box-shadow: 0 0 4px rgba(248, 81, 73, 0.4);
    animation: blocked-pulse 3s ease-in-out infinite;
}

@keyframes blocked-pulse {
    0%, 100% { box-shadow: 0 0 4px rgba(248, 81, 73, 0.4); }
    50% { box-shadow: 0 0 6px rgba(248, 81, 73, 0.6); }
}

.req-card.dragging {
    opacity: 0.5;
}

.req-card.debrief {
    border-left: 3px solid var(--accent-yellow);
    background: #1c1917;
}

.req-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.35rem;
    margin-bottom: 0.25rem;
}

.req-card-title {
    font-size: 0.75rem;
    color: var(--text-primary);
    flex: 1;
    line-height: 1.2;
}

.req-card-meta {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.65rem;
}

.req-card-priority {
    padding: 0.1rem 0.25rem;
    border-radius: 3px;
    font-weight: 600;
}

.priority-critical { background: var(--accent-red); color: #fff; }
.priority-high { background: #f0883e; color: #000; }
.priority-medium { background: var(--accent-yellow); color: #000; }
.priority-low { background: var(--accent-green); color: #000; }

.req-card.child-item {
    margin-left: 1.5rem;
}

.req-card-points {
    background: var(--bg-tertiary);
    padding: 0.1rem 0.25rem;
    border-radius: 3px;
    color: var(--text-secondary);
}

.req-card-assignee {
    background: var(--accent-blue);
    color: #fff;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    font-size: 0.6rem;
    margin-left: auto;
}

.req-card-type {
    font-size: 0.6rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.category-badge {
    display: inline-block;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    font-size: 0.6rem;
}

.backlog-list {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.backlog-section {
    padding: 1rem;
}

.backlog-section-header {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    user-select: none;
}

.backlog-section-header:hover {
    color: var(--text-primary);
}

.collapse-icon {
    display: inline-block;
    width: 1em;
    font-size: 0.7em;
    transition: transform 0.2s;
}

.section-count {
    font-weight: normal;
    color: var(--text-muted);
}

.backlog-section.collapsed .backlog-dropzone {
    display: none;
}

.backlog-section.dimmed {
    opacity: 0.5;
}

.backlog-section h4 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.backlog-section.debrief-section {
    background: #1c1917;
    border-bottom: 1px solid var(--border-color);
}

.backlog-section.debrief-section h4 {
    color: var(--accent-yellow);
}

.backlog-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.backlog-item:hover {
    border-color: var(--accent-blue);
}

.backlog-item.dragging {
    opacity: 0.5;
}

.backlog-item.drag-over {
    border-color: var(--accent-blue);
    background: var(--bg-tertiary);
}

.backlog-item.child-item {
    margin-left: 1.5rem;
}

.backlog-dropzone {
    min-height: 60px;
    padding: 0.5rem;
    border-radius: 6px;
}

.backlog-dropzone.drag-over {
    background: var(--bg-tertiary);
    outline: 2px dashed var(--accent-blue);
}

.backlog-item.debrief {
    border-left: 3px solid var(--accent-yellow);
}

.backlog-item.blocked {
    border-color: var(--accent-red);
    box-shadow: 0 0 4px rgba(248, 81, 73, 0.4);
    animation: blocked-pulse 3s ease-in-out infinite;
}

.backlog-item-title {
    flex: 1;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.backlog-item-meta {
    display: flex;
    gap: 0.25rem;
    align-items: center;
    flex-shrink: 0;
}

.backlog-item-meta > span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.backlog-item-status {
    width: 70px;
    padding: 0.1rem 0.25rem;
    border-radius: 3px;
    font-size: 0.65rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.backlog-item-status.status-todo { background: var(--bg-tertiary); color: var(--text-secondary); }
.backlog-item-status.status-in-progress { background: var(--accent-blue); color: #000; }
.backlog-item-status.status-review { background: var(--accent-yellow); color: #000; }
.backlog-item-status.status-done { background: var(--accent-green); color: #000; }

.backlog-item-meta .req-card-priority {
    width: 50px;
    font-size: 0.8rem;
}

.backlog-item-meta .req-card-points {
    width: 50px;
    font-size: 0.8rem;
}

.backlog-sprint-select {
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.75rem;
    cursor: pointer;
}

.sprint-select-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 1rem;
}

.sprint-select-view h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.sprint-select-empty {
    text-align: center;
    color: var(--text-secondary);
}

.sprint-select-empty h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.sprint-select-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
    width: 100%;
    max-width: 900px;
}

.sprint-select-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    cursor: pointer;
    transition: border-color 0.2s, transform 0.2s;
}

.sprint-select-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
}

.sprint-select-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.sprint-select-goal {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.sprint-select-dates {
    font-size: 0.75rem;
    color: var(--accent-blue);
}

.sprint-select-card.closed {
    opacity: 0.5;
}

.sprint-select-card.closed:hover {
    opacity: 0.7;
}

.sprint-closed-badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    margin-left: 0.5rem;
    font-weight: normal;
}

/* Closed Sprint Board State */
.board-columns.sprint-closed {
    opacity: 0.6;
}

.board-columns.sprint-closed .req-card {
    cursor: default;
}

.board-columns.sprint-closed .column-cards {
    pointer-events: none;
}

/* Context Menu */
.context-menu {
    position: fixed;
    background: #1a1a2e;
    border: 1px solid var(--accent-blue);
    border-radius: 6px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(88, 166, 255, 0.2);
    min-width: 200px;
    max-width: 280px;
    z-index: 1000;
    padding: 0.5rem 0;
}

.context-menu.hidden {
    display: none;
}

.context-menu-title {
    padding: 0.5rem 1rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.25rem;
    font-size: 0.8rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.context-menu-section {
    padding: 0.25rem 0;
}

.context-menu-label {
    padding: 0.25rem 1rem;
    font-size: 0.65rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

.context-menu-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: 0.25rem 0.75rem;
}

.context-menu-option {
    padding: 0.2rem 0.5rem;
    font-size: 0.7rem;
    border-radius: 3px;
    cursor: pointer;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid transparent;
    transition: background 0.15s, border-color 0.15s;
}

.context-menu-option:hover {
    background: var(--bg-primary);
    border-color: var(--accent-blue);
}

.context-menu-option.selected {
    background: var(--accent-blue);
    color: #000;
}

.context-menu-option.priority-critical { background: var(--accent-red); color: #fff; }
.context-menu-option.priority-high { background: #f0883e; color: #000; }
.context-menu-option.priority-medium { background: var(--accent-yellow); color: #000; }
.context-menu-option.priority-low { background: var(--accent-green); color: #000; }