/* Tasks Section in Day Column */
        .day-tasks {
            flex: 1;
            padding: 8px 0;
            min-height: 100px;
        }

        .day-task {
            display: flex;
            align-items: flex-start;
            gap: var(--space-2-5);
            padding: var(--space-2-5) var(--space-3);
            cursor: pointer;
            transition: all var(--transition-fast);
            border-left: 3px solid transparent;
        }

        .day-task:hover {
            background: var(--accent-blue-light);
        }

        .day-task.dragging {
            opacity: 0.5;
        }

        .day-task-checkbox {
            width: 18px;
            height: 18px;
            border: 1.5px solid var(--border-medium);
            border-radius: var(--radius-sm);
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all var(--transition-fast);
            margin-top: 1px;
        }

        .day-task-checkbox:hover {
            border-color: var(--accent-blue);
            background: var(--accent-blue-light);
        }

        .day-task-checkbox svg {
            width: 12px;
            height: 12px;
            stroke: var(--accent-blue);
            opacity: 0;
            transition: opacity var(--transition-fast);
        }

        .day-task-checkbox:hover svg {
            opacity: 0.5;
        }

        .day-task-content {
            flex: 1;
            min-width: 0;
        }

        .day-task-title {
            font-size: var(--font-size-14);
            color: var(--text-primary);
            line-height: 1.4;
        }

        .day-task-meta {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            margin-top: 4px;
        }

        .day-task-project {
            font-size: var(--font-size-xs);
            color: var(--text-tertiary);
            display: flex;
            align-items: center;
            gap: var(--space-1);
        }

        .day-task-project-dot {
            width: 6px;
            height: 6px;
            border-radius: var(--radius-circle);
            background: var(--accent-blue);
        }

        .day-task-duration {
            font-size: var(--font-size-xs);
            color: var(--text-tertiary);
            background: rgba(0, 0, 0, 0.04);
            padding: var(--space-half) var(--space-1-5);
            border-radius: var(--radius-sm);
        }

        .day-task-notes-icon {
            color: var(--text-tertiary);
        }

        .day-task-notes-icon svg {
            width: 12px;
            height: 12px;
        }

        /* Timebox Mode Styles */
        .day-column.timebox-mode .day-column-content {
            padding: 0;
            overflow-y: auto;
        }

        .day-column.timebox-mode .day-new-task {
            display: none;
        }

        .day-timeline {
            display: none;
            flex-direction: column;
            flex: 1;
            position: relative;
        }

        .day-column.timebox-mode .day-timeline {
            display: flex;
        }

        .day-column.timebox-mode .day-events,
        .day-column.timebox-mode .day-tasks {
            display: none;
        }

        .timeline-hour {
            display: flex;
            min-height: 48px;
            height: 48px;
            border-bottom: 1px solid var(--border-light);
            position: relative;
            flex-shrink: 0;
        }

        .timeline-hour-label {
            width: 44px;
            padding: var(--space-half) var(--space-1-5) 0 0;
            font-size: var(--font-size-2xs);
            color: var(--text-tertiary);
            text-align: right;
            flex-shrink: 0;
        }

        .timeline-hour-content {
            flex: 1;
            position: relative;
            border-left: 1px solid var(--border-light);
            transition: background var(--transition-fast);
        }

        .timeline-hour-content.drag-over {
            background: var(--accent-blue-light);
        }

        /* Timeline items overlay container */
        .timeline-items {
            position: absolute;
            top: 0;
            left: 44px;
            right: 0;
            pointer-events: none;
        }

        .timeline-items > * {
            pointer-events: auto;
        }

        .timeline-event {
            position: absolute;
            left: 4px;
            right: 4px;
            background: var(--accent-blue-focus);
            border-left: 3px solid var(--accent-blue);
            border-radius: var(--radius-sm);
            padding: var(--space-half) var(--space-1-5);
            font-size: var(--font-size-xs);
            overflow: hidden;
            z-index: 1;
            display: flex;
            flex-direction: column;
            gap: 1px;
        }

        .timeline-event-time {
            font-size: var(--font-size-2xs);
            font-weight: 600;
            opacity: 0.7;
        }

        .timeline-event-title {
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .timeline-event.calendar-green {
            background: rgba(76, 175, 80, 0.15);
            border-left-color: #4CAF50;
        }

        .timeline-event.calendar-purple {
            background: rgba(156, 39, 176, 0.15);
            border-left-color: #9C27B0;
        }

        .timeline-event.calendar-red {
            background: rgba(229, 57, 53, 0.15);
            border-left-color: #E53935;
        }

        .timeline-event.calendar-orange {
            background: rgba(255, 152, 0, 0.15);
            border-left-color: #FF9800;
        }

        .timeline-task {
            position: absolute;
            left: 4px;
            right: 4px;
            background: var(--bg-card);
            border: 1px solid var(--border-medium);
            border-radius: var(--radius-sm);
            padding: var(--space-half) var(--space-1-5);
            font-size: var(--font-size-xs);
            cursor: pointer;
            z-index: 2;
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 1px;
            overflow: hidden;
        }

        .timeline-task:hover {
            box-shadow: var(--shadow-md);
        }

        .timeline-task.dragging {
            opacity: 0.5;
        }

        .timeline-task-time {
            font-size: var(--font-size-2xs);
            font-weight: 600;
            color: var(--text-secondary);
        }

        .timeline-task-title {
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        /* Unscheduled tasks section at bottom of timeline */
        .timeline-unscheduled {
            border-top: 2px solid var(--border-medium);
            padding: var(--space-2);
            background: var(--bg-secondary);
            flex-shrink: 0;
        }

        .timeline-unscheduled-header {
            font-size: var(--font-size-2xs);
            font-weight: 600;
            color: var(--text-tertiary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
            padding-left: 4px;
        }

        .timeline-unscheduled-task {
            display: flex;
            align-items: center;
            gap: var(--space-2);
            padding: var(--space-1-5) var(--space-2);
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            margin-bottom: 4px;
            cursor: grab;
            transition: all var(--transition-fast);
            box-shadow: var(--shadow-sm);
        }

        .timeline-unscheduled-task:hover {
            box-shadow: var(--shadow-md);
        }

        .timeline-unscheduled-task.dragging {
            opacity: 0.5;
            cursor: grabbing;
        }

        .timeline-task-checkbox {
            width: 16px;
            height: 16px;
            border: 1.5px solid var(--border-medium);
            border-radius: var(--radius-sm);
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all var(--transition-fast);
        }

        .timeline-task-checkbox:hover {
            border-color: var(--accent-blue);
            background: var(--accent-blue-light);
        }

        .timeline-task-checkbox svg {
            width: 10px;
            height: 10px;
            stroke: var(--accent-blue);
            opacity: 0;
        }

        .timeline-task-checkbox:hover svg {
            opacity: 0.5;
        }

        .timeline-unscheduled-title {
            flex: 1;
            font-size: var(--font-size-12);
            color: var(--text-primary);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .timeline-unscheduled-duration {
            font-size: var(--font-size-2xs);
            color: var(--text-tertiary);
            background: rgba(0, 0, 0, 0.04);
            padding: var(--space-half) var(--space-1-5);
            border-radius: var(--radius-sm);
        }

        /* Empty Day State */
        .day-empty-state {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: var(--space-10) var(--space-5);
            text-align: center;
            color: var(--text-tertiary);
        }

        .day-empty-state svg {
            width: 32px;
            height: 32px;
            margin-bottom: 8px;
            opacity: 0.3;
        }

        .day-empty-state-text {
            font-size: var(--font-size-12);
        }

        /* Drop Zone Indicator */
        .drop-zone-indicator {
            position: absolute;
            left: 8px;
            right: 8px;
            height: 2px;
            background: var(--accent-blue);
            border-radius: 1px;
            opacity: 0;
            transition: opacity var(--transition-fast);
            pointer-events: none;
        }

        .drop-zone-indicator.visible {
            opacity: 1;
        }

        /* Animations */
        @keyframes taskSlideIn {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .task-animate-in {
            animation: taskSlideIn var(--duration-slow) var(--ease-in-out) forwards;
        }


        /* Task completion animation - uses @keyframes taskComplete defined earlier */
        .day-task.completing {
            animation: taskComplete var(--duration-slow) var(--ease-in-out) forwards;
        }

        .day-task.completing .day-task-checkbox {
            background: var(--accent-blue);
            border-color: var(--accent-blue);
        }

        .day-task.completing .day-task-checkbox svg {
            opacity: 1;
            stroke: white;
        }

        /* Smooth collapse for day-task completion */
        .day-task.collapsing {
            transition: height var(--duration-slow) var(--ease-in-out),
                        padding var(--duration-slow) var(--ease-in-out),
                        margin var(--duration-slow) var(--ease-in-out),
                        opacity var(--duration-fast) var(--ease-in-out);
            overflow: hidden;
            pointer-events: none;
            opacity: 0;
        }

        .day-task.collapsed {
            height: 0 !important;
            padding-top: 0 !important;
            padding-bottom: 0 !important;
            margin: 0 !important;
        }