/* CSS Variables for Theme Management */
:root {
  /* Light Theme Colors */
  --primary-green: #32CD32;
  --primary-cyan: #00CED1;
  --primary-navy: #001F54;
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-glass: rgba(255, 255, 255, 0.1);
  --text-primary: #ffffff;
  --text-secondary: #b0b0b0;
  --text-muted: #808080;
  --border-color: rgba(255, 255, 255, 0.2);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --glow-color: rgba(50, 205, 50, 0.5);
  --success-color: #10B981;
  --warning-color: #F59E0B;
  --error-color: #EF4444;
  --info-color: #3B82F6;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.8);
  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: rgba(0, 0, 0, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.1);
  --glow-color: rgba(50, 205, 50, 0.3);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow-x: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Animated Background */
.animated-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: linear-gradient(45deg, var(--primary-navy), var(--bg-primary), var(--primary-navy));
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Gradient Blobs */
.gradient-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.7;
  animation: float 20s ease-in-out infinite;
}

.blob-1 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--primary-green), transparent);
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.blob-2 {
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, var(--primary-cyan), transparent);
  top: 60%;
  right: 10%;
  animation-delay: -7s;
}

.blob-3 {
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--primary-navy), transparent);
  bottom: 20%;
  left: 50%;
  animation-delay: -14s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  33% { transform: translate(30px, -30px) rotate(120deg); }
  66% { transform: translate(-20px, 20px) rotate(240deg); }
}

/* Floating Particles */
.floating-particles {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary-cyan);
  border-radius: 50%;
  opacity: 0.6;
  animation: particleFloat 25s linear infinite;
}

.particle:nth-child(1) { left: 20%; animation-delay: 0s; }
.particle:nth-child(2) { left: 40%; animation-delay: -5s; }
.particle:nth-child(3) { left: 60%; animation-delay: -10s; }
.particle:nth-child(4) { left: 80%; animation-delay: -15s; }
.particle:nth-child(5) { left: 90%; animation-delay: -20s; }

@keyframes particleFloat {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-100px) scale(1);
    opacity: 0;
  }
}

/* App Container */
.app-container {
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

/* Header */
.app-header {
  padding: 2rem 0;
  backdrop-filter: blur(20px);
  background: var(--bg-glass);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  animation: slideDown 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-title {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: flex;
  align-items: center;
  gap: 1rem;
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from {
    filter: drop-shadow(0 0 10px var(--glow-color));
  }
  to {
    filter: drop-shadow(0 0 20px var(--glow-color));
  }
}

.app-title i {
  color: var(--primary-cyan);
  animation: rotate 10s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Theme Toggle */
.theme-toggle {
  position: relative;
  width: 60px;
  height: 30px;
  background: var(--bg-glass);
  border: 2px solid var(--border-color);
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px var(--glow-color);
}

.theme-icon {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sun-icon, .moon-icon {
  position: absolute;
  font-size: 1rem;
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.sun-icon {
  color: #FCD34D;
  transform: translateX(-10px) rotate(0deg);
  opacity: 1;
}

.moon-icon {
  color: #E5E7EB;
  transform: translateX(10px) rotate(180deg);
  opacity: 0;
}

[data-theme="light"] .sun-icon {
  transform: translateX(10px) rotate(180deg);
  opacity: 0;
}

[data-theme="light"] .moon-icon {
  transform: translateX(-10px) rotate(0deg);
  opacity: 1;
}

/* Main Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  animation: fadeInUp 1s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Stats Section */
.stats-section {
  margin-bottom: 3rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s;
}

.stat-card:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 20px 40px var(--shadow-color);
  border-color: var(--primary-cyan);
}

.stat-card:hover::before {
  left: 100%;
}

.stat-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Progress Container */
.progress-container {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
}

.progress-label {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.progress-bar {
  width: 100%;
  height: 12px;
  background: var(--bg-secondary);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-green), var(--primary-cyan));
  border-radius: 10px;
  width: 0%;
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* Task Input Section */
.task-input-section {
  margin-bottom: 3rem;
}

.input-container {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.input-container:hover {
  border-color: var(--primary-cyan);
  box-shadow: 0 10px 30px var(--shadow-color);
}

.input-group {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.task-input {
  flex: 1;
  padding: 1rem 1.5rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 15px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.task-input:focus {
  outline: none;
  border-color: var(--primary-cyan);
  box-shadow: 0 0 0 3px rgba(0, 206, 209, 0.1);
  transform: scale(1.02);
}

.add-btn {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
  border: none;
  border-radius: 15px;
  color: white;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.add-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.3s ease;
}

.add-btn:hover {
  transform: scale(1.05) rotate(90deg);
  box-shadow: 0 10px 30px var(--glow-color);
}

.add-btn:active::before {
  width: 100px;
  height: 100px;
}

.task-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.priority-select, .category-select, .due-date-input {
  padding: 0.8rem 1rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.priority-select:focus, .category-select:focus, .due-date-input:focus {
  outline: none;
  border-color: var(--primary-cyan);
  box-shadow: 0 0 0 3px rgba(0, 206, 209, 0.1);
}

/* Filter Section */
.filter-section {
  margin-bottom: 3rem;
}

.search-container {
  margin-bottom: 2rem;
}

.search-input-wrapper {
  position: relative;
  max-width: 400px;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
}

.search-input {
  width: 100%;
  padding: 1rem 1rem 1rem 3rem;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 2px solid var(--border-color);
  border-radius: 15px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-cyan);
  box-shadow: 0 0 0 3px rgba(0, 206, 209, 0.1);
  transform: scale(1.02);
}

.filter-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.filter-tab {
  padding: 0.8rem 1.5rem;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 2px solid var(--border-color);
  border-radius: 25px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  overflow: hidden;
}

.filter-tab::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-green), var(--primary-cyan));
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.filter-tab:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px var(--shadow-color);
  border-color: var(--primary-cyan);
}

.filter-tab.active {
  background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
  color: white;
  border-color: transparent;
}

.filter-tab.active::before {
  width: 100%;
}

.category-filters {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.category-filter {
  padding: 0.6rem 1.2rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.category-filter:hover {
  transform: scale(1.05);
  border-color: var(--primary-cyan);
}

.category-filter.active {
  background: var(--primary-cyan);
  color: white;
  border-color: var(--primary-cyan);
}

/* Tasks Section */
.tasks-section {
  position: relative;
}

.tasks-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Task Item */
.task-item {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 1.5rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  cursor: grab;
  animation: slideInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slideInUp {
  from {
    transform: translateY(30px) scale(0.95);
    opacity: 0;
  }
  to {
    transform: translateY(0) scale(1);
    opacity: 1;
  }
}

.task-item:hover {
  transform: translateY(-3px) scale(1.01);
  box-shadow: 0 15px 35px var(--shadow-color);
  border-color: var(--primary-cyan);
}

.task-item.dragging {
  transform: rotate(5deg) scale(1.05);
  box-shadow: 0 20px 40px var(--shadow-color);
  z-index: 1000;
  cursor: grabbing;
}

.task-item.completed {
  opacity: 0.7;
  background: var(--bg-secondary);
}

.task-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.task-checkbox {
  position: relative;
  width: 24px;
  height: 24px;
  cursor: pointer;
}

.task-checkbox input {
  opacity: 0;
  position: absolute;
  width: 100%;
  height: 100%;
  cursor: pointer;
}

.checkbox-custom {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.checkbox-custom::before {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
  border-radius: 4px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.task-checkbox input:checked + .checkbox-custom {
  border-color: var(--primary-green);
  background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
  animation: checkboxBounce 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.task-checkbox input:checked + .checkbox-custom::before {
  width: 100%;
  height: 100%;
}

.checkbox-icon {
  color: white;
  font-size: 0.8rem;
  opacity: 0;
  transform: scale(0);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.task-checkbox input:checked + .checkbox-custom .checkbox-icon {
  opacity: 1;
  transform: scale(1);
  animation: checkmarkPop 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55) 0.1s;
}

@keyframes checkboxBounce {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

@keyframes checkmarkPop {
  0% { transform: scale(0) rotate(0deg); }
  50% { transform: scale(1.2) rotate(180deg); }
  100% { transform: scale(1) rotate(360deg); }
}

.task-text {
  flex: 1;
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.task-text.completed {
  color: var(--text-muted);
  position: relative;
}

.task-text.completed::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-muted);
  animation: strikethrough 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes strikethrough {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.priority-badge {
  padding: 0.3rem 0.8rem;
  border-radius: 15px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  animation: badgeGlow 2s ease-in-out infinite alternate;
}

.priority-badge.high {
  background: rgba(239, 68, 68, 0.2);
  color: #EF4444;
  border: 1px solid #EF4444;
}

.priority-badge.medium {
  background: rgba(245, 158, 11, 0.2);
  color: #F59E0B;
  border: 1px solid #F59E0B;
}

.priority-badge.low {
  background: rgba(16, 185, 129, 0.2);
  color: #10B981;
  border: 1px solid #10B981;
}

@keyframes badgeGlow {
  from {
    box-shadow: 0 0 5px currentColor;
  }
  to {
    box-shadow: 0 0 15px currentColor;
  }
}

.category-badge {
  padding: 0.3rem 0.8rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 15px;
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.due-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.due-date.overdue {
  color: var(--error-color);
  animation: pulse 1s ease-in-out infinite;
}

.task-actions {
  display: flex;
  gap: 0.5rem;
  margin-left: auto;
}

.task-action {
  width: 36px;
  height: 36px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.task-action::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.3s ease;
}

.task-action:hover {
  transform: scale(1.1);
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
}

.task-action:active::before {
  width: 40px;
  height: 40px;
}

.task-action.edit:hover {
  background: rgba(59, 130, 246, 0.1);
  border-color: #3B82F6;
  color: #3B82F6;
}

.task-action.delete:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: #EF4444;
  color: #EF4444;
}

/* Delete Animation */
.task-item.deleting {
  animation: deleteTask 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes deleteTask {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(0.8);
    opacity: 0.5;
  }
  100% {
    transform: scale(0);
    opacity: 0;
    height: 0;
    padding: 0;
    margin: 0;
  }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
  animation: fadeIn 0.5s ease;
}

.empty-state.hidden {
  display: none;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
  animation: float 3s ease-in-out infinite;
}

.empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.empty-state p {
  font-size: 1rem;
  opacity: 0.8;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 15px;
  padding: 1rem 1.5rem;
  color: var(--text-primary);
  font-weight: 500;
  min-width: 300px;
  display: flex;
  align-items: center;
  gap: 1rem;
  pointer-events: auto;
  animation: toastSlideIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.toast::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--primary-cyan);
}

.toast.success::before {
  background: var(--success-color);
}

.toast.error::before {
  background: var(--error-color);
}

.toast.warning::before {
  background: var(--warning-color);
}

.toast-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.toast.success .toast-icon {
  color: var(--success-color);
}

.toast.error .toast-icon {
  color: var(--error-color);
}

.toast.warning .toast-icon {
  color: var(--warning-color);
}

.toast.info .toast-icon {
  color: var(--info-color);
}

@keyframes toastSlideIn {
  from {
    transform: translateX(100%) scale(0.8);
    opacity: 0;
  }
  to {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

.toast.removing {
  animation: toastSlideOut 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes toastSlideOut {
  to {
    transform: translateX(100%) scale(0.8);
    opacity: 0;
  }
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.modal {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow: hidden;
  transform: scale(0.8) translateY(20px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 2rem 2rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-close:hover {
  background: var(--error-color);
  color: white;
  border-color: var(--error-color);
  transform: scale(1.1);
}

.modal-body {
  padding: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-input, .form-select {
  width: 100%;
  padding: 1rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary-cyan);
  box-shadow: 0 0 0 3px rgba(0, 206, 209, 0.1);
}

.modal-footer {
  padding: 1rem 2rem 2rem;
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

.btn {
  padding: 0.8rem 2rem;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.3s ease;
}

.btn:active::before {
  width: 100px;
  height: 100px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-green), var(--primary-cyan));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px var(--glow-color);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* Drag and Drop Styles */
.task-item.drag-over {
  border-color: var(--primary-cyan);
  background: rgba(0, 206, 209, 0.1);
  transform: scale(1.02);
}

.drag-placeholder {
  height: 4px;
  background: linear-gradient(90deg, var(--primary-green), var(--primary-cyan));
  border-radius: 2px;
  margin: 0.5rem 0;
  opacity: 0;
  transform: scaleX(0);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.drag-placeholder.active {
  opacity: 1;
  transform: scaleX(1);
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    padding: 0 1rem;
  }
  
  .app-title {
    font-size: 2rem;
  }
  
  .main-content {
    padding: 1rem;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .stat-card {
    padding: 1.5rem;
  }
  
  .input-group {
    flex-direction: column;
  }
  
  .add-btn {
    width: 100%;
    height: 50px;
  }
  
  .task-options {
    grid-template-columns: 1fr;
  }
  
  .filter-tabs {
    flex-direction: column;
    align-items: stretch;
  }
  
  .filter-tab {
    justify-content: center;
  }
  
  .category-filters {
    justify-content: center;
  }
  
  .task-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .task-actions {
    margin-left: 0;
    width: 100%;
    justify-content: flex-end;
  }
  
  .toast-container {
    top: 1rem;
    right: 1rem;
    left: 1rem;
  }
  
  .toast {
    min-width: auto;
  }
  
  .modal {
    width: 95%;
    margin: 1rem;
  }
  
  .modal-header, .modal-body, .modal-footer {
    padding: 1.5rem;
  }
  
  .modal-footer {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .app-title {
    font-size: 1.5rem;
    gap: 0.5rem;
  }
  
  .stats-grid {
    gap: 0.8rem;
  }
  
  .stat-card {
    padding: 1rem;
    flex-direction: column;
    text-align: center;
  }
  
  .stat-icon {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }
  
  .task-item {
    padding: 1rem;
  }
  
  .task-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-color: rgba(255, 255, 255, 0.5);
    --bg-glass: rgba(255, 255, 255, 0.2);
  }
  
  [data-theme="light"] {
    --border-color: rgba(0, 0, 0, 0.3);
    --bg-glass: rgba(255, 255, 255, 0.9);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .gradient-blob,
  .particle,
  .animated-background {
    animation: none !important;
  }
}

/* Print styles */
@media print {
  .animated-background,
  .floating-particles,
  .gradient-blob,
  .theme-toggle,
  .task-actions,
  .add-btn,
  .filter-section,
  .toast-container {
    display: none !important;
  }
  
  .app-container {
    background: white !important;
    color: black !important;
  }
  
  .task-item {
    background: white !important;
    border: 1px solid #ccc !important;
    break-inside: avoid;
  }
}