:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
}

body.light-mode {
    --bg-dark: #f1f5f9;
    --bg-panel: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 380px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    position: relative;
    resize: horizontal;
    min-width: 320px;
    max-width: 600px;
}

.sidebar-resize-handle {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    cursor: ew-resize;
    background: transparent;
    transition: background 0.2s;
    z-index: 100;
}

.sidebar-resize-handle:hover {
    background: var(--accent);
}

.logo h1 {
    background: linear-gradient(45deg, #3b82f6, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 24px;
    font-weight: 700;
}

.panel-section {
    background: rgba(0, 0, 0, 0.2);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.panel-section h3 {
    font-size: 14px;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-weight: 600;
}

/* Forms */
.form-group {
    margin-bottom: 15px;
}

.form-row {
    display: flex;
    gap: 15px;
    width: 100%;
}

.form-row .form-group {
    flex: 1;
    min-width: 0;
}

label {
    display: block;
    font-size: 12px;
    margin-bottom: 6px;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.inline-btn {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 2px 8px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    margin-left: 8px;
    transition: background 0.2s;
}

.inline-btn:hover {
    background: var(--accent-hover);
}

input,
select {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s, background 0.2s;
}

input[type="date"] {
    min-width: 140px;
    color-scheme: dark;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--text-primary);
    font-weight: 500;
    padding: 10px 12px;
}

input[type="date"]:hover {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.5);
}

input[type="date"]:focus {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(0.7) sepia(1) saturate(3) hue-rotate(190deg);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    transition: background 0.2s;
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
    background: rgba(59, 130, 246, 0.2);
}

input:focus,
select:focus {
    border-color: var(--accent);
}

.cta-btn {
    width: 100%;
    background: var(--accent);
    color: white;
    border: none;
    padding: 10px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.cta-btn:hover {
    background: var(--accent-hover);
}

.secondary-btn {
    width: 100%;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
}

.secondary-btn:hover {
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.small-btn {
    padding: 5px 10px;
    font-size: 16px;
}

.task-actions {
    position: absolute;
    right: -70px;
    top: 0;
    display: flex;
    gap: 5px;
    opacity: 0;
    transition: opacity 0.2s;
}

.gantt-row:hover .task-actions {
    opacity: 1;
}

.action-icon {
    cursor: pointer;
    font-size: 14px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    width: 24px;
    height: 24px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.action-icon:hover {
    background: var(--accent);
    color: white;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-bar {
    height: 60px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    background: var(--bg-dark);
}

.filters {
    display: flex;
    gap: 10px;
    align-items: center;
}

.filters input,
.filters select {
    width: auto;
}

.gantt-wrapper {
    flex: 1;
    overflow: auto;
    position: relative;
    padding: 20px;
}

.gantt-header-row {
    display: flex;
    margin-left: 200px;
    /* Offset for task names */
    border-bottom: 1px solid var(--border);
    padding-bottom: 10px;
    margin-bottom: 10px;
    position: sticky;
    top: 0;
    background: var(--bg-dark);
    z-index: 10;
}

.week-col {
    min-width: 100px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    border-right: 1px dashed var(--border);
}

.gantt-row {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    position: relative;
    height: 35px;
}

.task-label {
    width: 200px;
    font-size: 13px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding-right: 15px;
    color: var(--text-primary);
    position: sticky;
    left: 0;
    background: var(--bg-dark);
    z-index: 5;
    display: flex;
    align-items: center;
}

.status-quick-select {
    font-size: 10px;
    padding: 2px 4px;
    border-radius: 4px;
    border: 1px solid var(--border);
    background: var(--bg-panel);
    color: var(--text-primary);
    cursor: pointer;
    min-width: 80px;
    font-weight: 600;
}

.status-quick-select:hover {
    border-color: var(--accent);
}

/* Status-specific colors */
.status-quick-select[data-status="Completed"] {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

.status-quick-select[data-status="In Progress"] {
    background: #ffc107;
    color: #000;
    border-color: #ffc107;
}

.status-quick-select[data-status="Blocked"] {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

.status-quick-select[data-status="Not Started"] {
    background: #6c757d;
    color: white;
    border-color: #6c757d;
}

.task-bar {
    height: 24px;
    border-radius: 4px;
    position: absolute;
    /* Left and Width are set by JS */
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    cursor: pointer;
    transition: transform 0.2s;
}

.task-bar:hover {
    transform: scaleY(1.1);
    z-index: 2;
}

.task-bar.milestone {
    width: 24px !important;
    transform: rotate(45deg);
    border-radius: 2px;
    margin-left: -12px;
    /* Center diamond */
}

/* AI Assist */
#ai-assist-btn {
    cursor: pointer;
    font-size: 16px;
    margin-left: 5px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.hidden {
    display: none !important;
}

.modal-content {
    background: var(--bg-panel);
    padding: 30px;
    border-radius: 12px;
    width: 500px;
    border: 1px solid var(--border);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    position: relative;
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
}

.ai-result {
    margin-top: 15px;
    background: var(--bg-dark);
    padding: 10px;
    border-radius: 6px;
    border: 1px solid var(--border);
    min-height: 80px;
    max-height: 200px;
    overflow-y: auto;
    font-size: 13px;
    white-space: pre-wrap;
}

.grid-bg {
    position: absolute;
    top: 0;
    left: 200px;
    right: 0;
    bottom: 0;
    display: flex;
    z-index: 0;
    pointer-events: none;
}

.grid-col {
    min-width: 100px;
    border-right: 1px dashed rgba(255, 255, 255, 0.05);
    height: 100%;
}

.today-marker {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, transparent, #ef4444, transparent);
    z-index: 15;
    pointer-events: none;
}

.today-marker::before {
    content: 'TODAY';
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    background: #ef4444;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

/* Epic Panel */
.epic-panel {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 400px;
    background: var(--bg-panel);
    border-left: 1px solid var(--border);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
    z-index: 50;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
}

.epic-panel:not(.hidden) {
    transform: translateX(0);
}

.epic-panel-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.2);
}

.epic-panel-header h2 {
    font-size: 18px;
    font-weight: 600;
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 32px;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s;
}

.close-btn:hover {
    color: var(--text-primary);
}

.epic-panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
}

.epic-card {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    transition: all 0.2s;
}

.epic-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
}

.epic-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
    cursor: pointer;
}

.epic-card-title {
    flex: 1;
}

.epic-number {
    font-size: 11px;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.epic-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.epic-expand-icon {
    color: var(--text-secondary);
    font-size: 20px;
    transition: transform 0.2s;
}

.epic-card.expanded .epic-expand-icon {
    transform: rotate(180deg);
}

.epic-description {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 12px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.epic-card.expanded .epic-description {
    max-height: 500px;
}

.epic-stats {
    display: flex;
    gap: 15px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.epic-stat {
    display: flex;
    align-items: center;
    gap: 5px;
}

.epic-progress-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 10px;
}

.epic-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #8b5cf6);
    transition: width 0.3s ease;
}

.epic-actions {
    display: flex;
    gap: 8px;
}

.epic-action-btn {
    flex: 1;
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 4px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.epic-action-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
}

/* Bulk Actions Toolbar */
.bulk-toolbar {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 15px 25px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 100;
    transition: transform 0.3s ease;
}

.bulk-toolbar.visible {
    transform: translateX(-50%) translateY(0);
}

.bulk-count {
    font-weight: 600;
    color: var(--accent);
    margin-right: 10px;
}

.bulk-btn {
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-dark);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}

.bulk-btn:hover {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
}

.bulk-btn.danger:hover {
    border-color: #dc3545;
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
}

/* Dashboard */
.dashboard-view {
    padding: 20px;
    overflow-y: auto;
    height: 100%;
}

.dashboard-view.hidden {
    display: none;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border);
}

.dashboard-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.dashboard-filter {
    display: flex;
    align-items: center;
    gap: 10px;
}

.dashboard-filter label {
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: none;
    margin: 0;
}

.dashboard-filter select {
    min-width: 200px;
    padding: 8px 12px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 6px;
    font-size: 13px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
}

.health-card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}

.health-card h3 {
    font-size: 16px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.metrics-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
}

.metric-card {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 6px;
    padding: 15px;
    text-align: center;
}

.metric-card.danger {
    background: rgba(220, 53, 69, 0.1);
    border-color: rgba(220, 53, 69, 0.3);
}

.metric-card.warning {
    background: rgba(255, 193, 7, 0.1);
    border-color: rgba(255, 193, 7, 0.3);
}

.metric-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 5px;
}

.metric-card.danger .metric-value {
    color: #dc3545;
}

.metric-card.warning .metric-value {
    color: #ffc107;
}

.metric-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-chart {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.status-bar {
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-bar-label {
    min-width: 100px;
    font-size: 13px;
    color: var(--text-secondary);
}

.status-bar-track {
    flex: 1;
    height: 24px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.status-bar-fill {
    height: 100%;
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 600;
    color: white;
}

.deadlines-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 300px;
    overflow-y: auto;
}

.deadline-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 4px;
    border-left: 3px solid var(--accent);
}

.deadline-item.overdue {
    border-left-color: #dc3545;
}

.deadline-task-name {
    font-size: 13px;
    color: var(--text-primary);
}

.deadline-date {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Status Donut Chart */
.status-pie-container {
    display: flex;
    gap: 30px;
    align-items: center;
    justify-content: center;
    padding: 20px 0;
}

#statusPieChart {
    max-width: 220px;
    max-height: 220px;
}

.status-pie-legend {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.status-legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
}

.status-legend-color {
    width: 18px;
    height: 18px;
    border-radius: 3px;
    flex-shrink: 0;
}

.status-legend-label {
    color: var(--text-secondary);
    min-width: 100px;
}

.status-legend-value {
    color: var(--text-primary);
    font-weight: 600;
    margin-left: auto;
}

/* Task Detail Panel */
.task-detail-panel {
    position: fixed;
    right: 0;
    top: 0;
    width: 450px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.task-detail-panel.hidden {
    transform: translateX(100%);
    pointer-events: none;
}


.panel-scroll-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.detail-section {
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.detail-section h3 {
    font-size: 14px;
    color: var(--accent);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#detailDescription {
    width: 100%;
    min-height: 100px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    color: var(--text-primary);
    padding: 10px;
    resize: vertical;
    font-family: inherit;
}

.dependency-list,
.comments-list,
.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 10px;
}

.comment-item,
.history-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 10px;
    border-radius: 4px;
    font-size: 13px;
}

.comment-meta,
.history-meta {
    font-size: 11px;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.comment-input-area {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#newCommentText {
    width: 100%;
    height: 60px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    color: var(--text-primary);
    padding: 10px;
    font-family: inherit;
}

.add-dependency {
    display: flex;
    gap: 10px;
}

#dependencySelect {
    flex: 1;
}

.panel-footer {
    padding: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: var(--bg-secondary);
}
/* Transition Overrides */
.epic-panel.hidden, .task-detail-panel.hidden {
    display: flex !important;
    transform: translateX(100%);
    pointer-events: none;
}

.epic-panel:not(.hidden), .task-detail-panel:not(.hidden) {
    transform: translateX(0);
    pointer-events: auto;
}

/* Close Button Improvements */
.close-btn {
    background: rgba(255, 255, 255, 0.05);
    border: none;
    color: var(--text-secondary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 20px;
}

.close-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    transform: rotate(90deg);
}


/* Task Progress & Overdue Indicators */
.task-bar {
    overflow: hidden;
    position: relative;
}

.task-bar-progress {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    pointer-events: none;
    transition: width 0.3s ease;
}

.task-bar.overdue {
    border: 1.5px solid #ef4444;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.4);
}

.task-bar.overdue::after {
    content: "??";
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 10px;
    filter: drop-shadow(0 0 2px black);
}

.task-bar-percent {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-size: 9px;
    font-weight: 700;
    color: white;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    text-shadow: 0 0 3px rgba(0,0,0,0.8);
}

.task-bar:hover .task-bar-percent {
    opacity: 1;
}

.progress-control {
    padding: 10px 0;
}

#detailProgressValue {
    font-weight: 700;
    color: var(--accent);
}

/* Navigation Tabs (Segmented Control) */
.nav-menu {
    display: flex;
    background: rgba(0, 0, 0, 0.2);
    padding: 4px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    gap: 4px;
}

.nav-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}

.nav-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}