/* --- CSS Reset & Variables --- */
:root {
  --bg-color: #0b0f19;
  --panel-bg: #151d30;
  --card-bg: #1e2942;
  --card-hover-bg: #253352;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --button-text: #f8fafc;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  
  --color-red: #ef4444;
  --color-yellow: #f59e0b;
  --color-slate: #64748b;
  --color-green: #10b981;
  --color-blue: #3b82f6;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.3);
  --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  overflow-x: hidden;
  padding: 16px;
  min-height: 100vh;
}

/* --- Layout Container --- */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* --- Header Section --- */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.header-main h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, #3b82f6, #10b981);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-main .subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 4px;
}

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

.filters label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.filters select {
  background-color: var(--panel-bg);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  transition: var(--transition-fast);
}

.filters select:focus {
  border-color: var(--color-blue);
}

/* --- Kanban Grid --- */
.kanban-board {
  display: grid;
  grid-template-columns: repeat(5, minmax(220px, 1fr));
  gap: 16px;
  align-items: start;
}

@media (max-width: 1024px) {
  .kanban-board {
    grid-template-columns: repeat(3, minmax(220px, 1fr));
  }
}

@media (max-width: 768px) {
  .kanban-board {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* --- Columns --- */
.kanban-column {
  background-color: var(--panel-bg);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 200px;
  max-height: calc(100vh - 150px);
  overflow-y: auto;
}

@media (max-width: 768px) {
  .kanban-column {
    max-height: 400px;
  }
}

.column-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.column-header h2 {
  font-size: 0.95rem;
  font-weight: 600;
  flex-grow: 1;
}

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

.column-overdue .dot { background-color: var(--color-red); }
.column-today .dot { background-color: var(--color-yellow); }
.column-todo .dot { background-color: var(--color-slate); }
.column-progress .dot { background-color: var(--color-green); }
.column-done .dot { background-color: var(--color-blue); }

.column-header .count {
  background-color: rgba(255, 255, 255, 0.06);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* --- Task Lists --- */
.task-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 100px;
}

/* --- Task Cards --- */
.task-card {
  background-color: var(--card-bg);
  color: var(--card-text, var(--text-main));
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px;
  cursor: pointer;
  transition: var(--transition-fast);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.task-card:hover {
  transform: translateY(-2px);
  background-color: var(--card-hover-bg);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.task-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 4px;
}

.task-card[data-priority="HIGH"]::before { background-color: var(--color-red); }
.task-card[data-priority="MEDIUM"]::before { background-color: var(--color-yellow); }
.task-card[data-priority="LOW"]::before { background-color: var(--color-slate); }

.task-card h3 {
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
  word-break: break-word;
  color: inherit;
}

.card-project {
  font-size: 0.75rem;
  color: var(--color-blue);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.card-meta .assignee {
  font-weight: 500;
}

.card-meta .deadline {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- Modals --- */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.modal.active {
  visibility: visible;
  opacity: 1;
}

.modal-overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}

.modal-content {
  background-color: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  width: 90%;
  max-width: 550px;
  position: relative;
  z-index: 1001;
  padding: 24px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 16px;
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-project {
  font-size: 0.8rem;
  color: var(--color-blue);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.8rem;
  cursor: pointer;
  line-height: 1;
}

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

.modal-content h2 {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
}

.modal-metadata {
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 16px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.meta-value {
  font-size: 0.9rem;
  font-weight: 600;
}

.badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  width: fit-content;
  text-transform: uppercase;
}

.badge[data-priority="HIGH"] { background-color: rgba(239, 68, 68, 0.2); color: var(--color-red); }
.badge[data-priority="MEDIUM"] { background-color: rgba(245, 158, 11, 0.2); color: var(--color-yellow); }
.badge[data-priority="LOW"] { background-color: rgba(148, 163, 184, 0.2); color: var(--text-muted); }

/* --- Action steps --- */
.modal-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.modal-body h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
}

.action-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  line-height: 1.4;
  padding: 6px 0;
}

.step-bullet {
  color: var(--color-blue);
  font-weight: bold;
}

/* --- Status Change buttons --- */
.modal-footer {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.footer-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.status-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.btn {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--button-text);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn:hover {
  background-color: var(--card-hover-bg);
  border-color: var(--border-hover);
}

.btn-todo:hover { border-color: var(--color-slate); color: var(--color-slate); }
.btn-progress:hover { border-color: var(--color-green); color: var(--color-green); }
.btn-blocked:hover { border-color: var(--color-yellow); color: var(--color-yellow); }
.btn-urgent:hover { border-color: var(--color-red); color: var(--color-red); }
.btn-done:hover { border-color: var(--color-blue); color: var(--color-blue); }

/* --- Swimlanes & Region layout --- */
.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.swimlane {
  width: 100%;
  margin-bottom: 24px;
  background-color: rgba(255, 255, 255, 0.01);
  border-radius: 14px;
  padding: 16px;
  border: 1px dashed rgba(255, 255, 255, 0.05);
}

.swimlane-header {
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.swimlane-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-blue);
  display: flex;
  align-items: center;
  gap: 6px;
}

.swimlane-board {
  display: grid;
  grid-template-columns: repeat(5, minmax(220px, 1fr));
  gap: 16px;
  align-items: start;
}

@media (max-width: 1024px) {
  .swimlane-board {
    grid-template-columns: repeat(3, minmax(220px, 1fr));
  }
}

@media (max-width: 768px) {
  .swimlane-board {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* --- Checklist Interactive Styles --- */
.step-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: var(--transition-fast);
}

.step-item:hover {
  background-color: rgba(255, 255, 255, 0.04);
}

.step-checkbox {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-blue);
  flex-shrink: 0;
}

}

/* --- Board Controls & Tabs & Advanced Filters --- */
.board-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
  background-color: var(--panel-bg);
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

.view-tabs, .category-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tab-btn, .cat-btn {
  background-color: var(--card-bg);
  color: var(--button-text);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab-btn:hover, .cat-btn:hover {
  background-color: var(--card-hover-bg);
  color: var(--text-main);
  border-color: var(--border-hover);
}

.tab-btn.active, .cat-btn.active {
  background-color: var(--color-blue);
  color: #ffffff !important;
  border-color: var(--color-blue);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.3);
}

/* --- Timeline Layout --- */
.timeline-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
}

.timeline-group {
  background-color: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
}

.timeline-date {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-blue);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

/* --- Blocked Indicator Badge --- */
.blocked-indicator {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-red);
  border: 1px solid rgba(239, 68, 68, 0.3);
  font-size: 0.72rem;
  border-radius: 6px;
  padding: 3px 8px;
  font-weight: 600;
  width: fit-content;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  gap: 4px;
}

.blocked-indicator::before {
  content: '⚠️';
  font-size: 0.75rem;
}

/* --- Modal Editable Fields --- */
.modal-title-container {
  margin-bottom: 12px;
}

.modal-title-input {
  width: 100%;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 4px 8px;
  transition: var(--transition-fast);
}

.modal-title-input:hover {
  background: rgba(255, 255, 255, 0.02);
  border-color: var(--border-color);
}

.modal-title-input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--color-blue);
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.2);
}

.modal-select, .modal-input {
  width: 100%;
  box-sizing: border-box;
  background-color: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 0.85rem;
  transition: var(--transition-fast);
  outline: none;
}

.modal-select:hover, .modal-input:hover, .modal-select:focus, .modal-input:focus {
  border-color: var(--border-hover);
  background-color: var(--card-hover-bg);
}

.modal-input[type="date"] {
  color-scheme: dark; /* styling for date picker in dark mode */
}

/* --- Drag Handle & Card Header --- */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.drag-handle {
  cursor: grab;
  user-select: none;
  font-size: 1.1rem;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
  transition: var(--transition-fast);
}

.drag-handle:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.drag-handle:active {
  cursor: grabbing;
}

/* --- KPI Panel --- */
.kpi-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  .kpi-panel {
    grid-template-columns: repeat(2, 1fr);
  }
}

.kpi-card {
  background-color: var(--panel-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-fast);
}

.kpi-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.kpi-value {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.kpi-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.kpi-card.overdue .kpi-value { color: var(--color-red); }
.kpi-card.today .kpi-value { color: var(--color-yellow); }
.kpi-card.active .kpi-value { color: var(--color-green); }
.kpi-card.completed .kpi-value { color: var(--color-blue); }

/* --- Board Actions Row --- */
.board-actions-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
  gap: 16px;
  flex-wrap: wrap;
}

.search-box {
  flex-grow: 1;
  max-width: 450px;
}

.search-box input {
  width: 100%;
  background-color: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--color-blue);
  background-color: var(--card-hover-bg);
}

.controls-actions {
  display: flex;
  gap: 10px;
}

.action-btn {
  background-color: var(--card-bg);
  color: var(--button-text);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.action-btn:hover {
  background-color: var(--card-hover-bg);
  border-color: var(--border-hover);
}

.action-btn.primary {
  background-color: var(--color-blue);
  color: #ffffff !important;
  border-color: var(--color-blue);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.3);
}

.action-btn.primary:hover {
  background-color: #2563eb;
  color: #ffffff !important;
  border-color: #2563eb;
}

/* --- Compact Mode --- */
.compact-mode .task-card {
  padding: 8px 10px;
  gap: 4px;
}

.compact-mode .task-card h3 {
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.compact-mode .card-project {
  font-size: 0.7rem;
}

.compact-mode .card-meta {
  margin-top: 2px;
  font-size: 0.7rem;
}

.compact-mode .drag-handle {
  font-size: 0.9rem;
  padding: 0 4px;
}

.compact-mode .blocked-indicator {
  font-size: 0.65rem;
  padding: 1px 4px;
  margin-top: 1px;
}

/* --- Description Textarea --- */
.modal-textarea {
  width: 100%;
  min-height: 80px;
  background-color: var(--card-bg);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 0.85rem;
  transition: var(--transition-fast);
  outline: none;
  resize: vertical;
}

.modal-textarea:hover, .modal-textarea:focus {
  border-color: var(--border-hover);
  background-color: var(--card-hover-bg);
}