:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-tertiary: #1f2937;
  --card-bg: #1a202c;
  --border: rgba(255,255,255,0.1);
  --border-hover: rgba(255,255,255,0.2);
  --text-primary: #f7fafc;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  --accent: #4299e1;
  --accent-hover: #3182ce;
  --accent-light: #63b3ed;
  --success: #48bb78;
  --warning: #ed8936;
  --danger: #f56565;
  --radius: 16px;
  --shadow: 0 10px 40px rgba(0,0,0,0.3);
  --shadow-hover: 0 20px 60px rgba(0,0,0,0.4);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  color-scheme: dark;
}

* { 
  box-sizing: border-box; 
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Cairo', sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
  min-height: 100vh;
  padding: 20px;
  line-height: 1.6;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(66, 153, 225, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(72, 187, 120, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(237, 137, 54, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  background: var(--card-bg);
  padding: 20px 30px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
  position: relative;
  z-index: 10;
  max-width: 1500px;
  margin: 0px auto 20px;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}

.logo {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo i {
  color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.btn {
  padding: 12px 20px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
  color: white;
}

.btn-secondary {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(66, 153, 225, 0.3);
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.column {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 25px;
  min-height: 70vh;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}

.column::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}

.column:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.column-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
  padding-bottom: 15px;
  border-bottom: 2px solid var(--border);
  position: relative;
  z-index: 1;
}

.column-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.task-count {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--border);
}

.scheduled .column-header {
  border-bottom-color: var(--warning);
}

.in-progress .column-header {
  border-bottom-color: var(--accent);
}

.completed .column-header {
  border-bottom-color: var(--success);
}

.scheduled .task-count {
  background: rgba(237, 137, 54, 0.1);
  color: var(--warning);
  border-color: var(--warning);
}

.in-progress .task-count {
  background: rgba(66, 153, 225, 0.1);
  color: var(--accent);
  border-color: var(--accent);
}

.completed .task-count {
  background: rgba(72, 187, 120, 0.1);
  color: var(--success);
  border-color: var(--success);
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
  position: relative;
  z-index: 1;
}

.task-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  transition: var(--transition);
  cursor: grab;
  position: relative;
  overflow: hidden;
}

.task-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.02) 0%, transparent 50%);
  pointer-events: none;
}

.task-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  border-color: var(--border-hover);
}

.task-card.dragging {
  opacity: 0.5;
  transform: rotate(5deg);
}

.task-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.4;
}

.task-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.task-assignee {
  color: var(--text-secondary);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.task-date {
  color: var(--text-muted);
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.priority-badge {
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.priority-high { 
  background: rgba(245, 101, 101, 0.2); 
  color: var(--danger);
  border: 1px solid rgba(245, 101, 101, 0.3);
}

.priority-normal { 
  background: rgba(66, 153, 225, 0.2); 
  color: var(--accent);
  border: 1px solid rgba(66, 153, 225, 0.3);
}

.priority-low { 
  background: rgba(72, 187, 120, 0.2); 
  color: var(--success);
  border: 1px solid rgba(72, 187, 120, 0.3);
}

.task-notes {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.5;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  padding: 40px 20px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  margin-top: 20px;
}

.empty-state i {
  font-size: 32px;
  margin-bottom: 10px;
  display: block;
  opacity: 0.5;
}

.stats-bar {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 30px;
  margin-bottom: 30px;
  backdrop-filter: blur(10px);
  position: relative;
  z-index: 1;
}

.stats-bar::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, transparent 50%);
  pointer-events: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
}

.stat-item {
  text-align: center;
  position: relative;
  z-index: 1;
}

.stat-number {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.stat-label {
  color: var(--text-secondary);
  margin-top: 5px;
  font-size: 14px;
}

@media (max-width: 768px) {
  .board {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .header {
    flex-direction: column;
    gap: 15px;
  }
  
  .header-actions {
    width: 100%;
    justify-content: center;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .column {
    min-height: 50vh;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.column {
  animation: fadeInUp 0.6s ease forwards;
}

.column:nth-child(1) { animation-delay: 0.1s; }
.column:nth-child(2) { animation-delay: 0.2s; }
.column:nth-child(3) { animation-delay: 0.3s; }