/* ==========================================================================
   TaskFlow Design System & Modern Stylesheet
   ========================================================================== */

:root {
  /* Dark Theme (Default) */
  --bg-main: #0B0F19;
  --bg-card: rgba(17, 24, 39, 0.78);
  --bg-card-hover: rgba(26, 36, 56, 0.85);
  --bg-input: rgba(15, 23, 42, 0.65);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.65);
  --text-primary: #F3F4F6;
  --text-secondary: #9CA3AF;
  --text-muted: #6B7280;

  /* Accent & Gradients */
  --accent-primary: #6366F1;
  --accent-primary-hover: #4F46E5;
  --accent-secondary: #EC4899;
  --accent-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 50%, #D946EF 100%);
  --accent-gradient-glow: 0 8px 24px -4px rgba(99, 102, 241, 0.45);
  
  /* Status Colors */
  --priority-high: #EF4444;
  --priority-high-bg: rgba(239, 68, 68, 0.14);
  --priority-high-border: rgba(239, 68, 68, 0.3);

  --priority-medium: #F59E0B;
  --priority-medium-bg: rgba(245, 158, 11, 0.14);
  --priority-medium-border: rgba(245, 158, 11, 0.3);

  --priority-low: #10B981;
  --priority-low-bg: rgba(16, 185, 129, 0.14);
  --priority-low-border: rgba(16, 185, 129, 0.3);

  --due-overdue: #F87171;
  --due-today: #FBBF24;
  --due-future: #94A3B8;

  /* Glassmorphism & Shadow */
  --glass-blur: blur(20px);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 10px 30px -8px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 40px -12px rgba(0, 0, 0, 0.65);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-spring: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="light"] {
  --bg-main: #F4F6FB;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  --bg-input: rgba(241, 245, 249, 0.9);
  --border-card: rgba(203, 213, 225, 0.65);
  --border-focus: rgba(99, 102, 241, 0.6);
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;

  --accent-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #C026D3 100%);
  --accent-gradient-glow: 0 8px 24px -4px rgba(79, 70, 229, 0.3);

  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 12px 28px -6px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 38px -10px rgba(15, 23, 42, 0.12);
}

/* ==========================================================================
   Reset & Core Structure
   ========================================================================== */

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

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
}

/* Confetti canvas */
#confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

/* Ambient glow orbs */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
  transition: opacity var(--transition-normal);
}

.glow-1 {
  width: 360px;
  height: 360px;
  top: -80px;
  left: 10%;
  background: radial-gradient(circle, #6366F1 0%, rgba(99, 102, 241, 0) 70%);
}

.glow-2 {
  width: 420px;
  height: 420px;
  top: 30%;
  right: 5%;
  background: radial-gradient(circle, #8B5CF6 0%, rgba(139, 92, 246, 0) 70%);
}

.glow-3 {
  width: 320px;
  height: 320px;
  bottom: 5%;
  left: 15%;
  background: radial-gradient(circle, #EC4899 0%, rgba(236, 72, 153, 0) 70%);
}

[data-theme="light"] .ambient-glow {
  opacity: 0.22;
}

/* Layout Wrapper */
.app-wrapper {
  position: relative;
  z-index: 1;
  max-width: 820px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* ==========================================================================
   Header & Brand
   ========================================================================== */

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

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

.brand-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: var(--accent-gradient-glow);
  flex-shrink: 0;
}

.brand-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  line-height: 1.15;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.86rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

/* Icon Buttons */
.icon-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

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

.icon-btn:active {
  transform: translateY(1px);
}

/* Dropdown Menu */
.dropdown-wrapper {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.45rem;
  min-width: 185px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  animation: dropdownIn 0.18s ease-out;
}

@keyframes dropdownIn {
  from { opacity: 0; transform: translateY(-8px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.8rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.dropdown-item:hover {
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
}

.dropdown-item.danger:hover {
  background: rgba(239, 68, 68, 0.12);
  color: var(--priority-high);
}

.dropdown-divider {
  height: 1px;
  background: var(--border-card);
  margin: 0.2rem 0;
}

.file-label {
  margin: 0;
  cursor: pointer;
}

/* ==========================================================================
   Productivity Progress Card
   ========================================================================== */

.stats-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.stats-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-gradient);
  opacity: 0.8;
}

.stats-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.stats-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(99, 102, 241, 0.16);
  color: var(--accent-primary);
  margin-bottom: 0.4rem;
}

.stats-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.stats-subtext {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* Circular Progress */
.stats-circular {
  position: relative;
  width: 76px;
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.progress-ring {
  transform: rotate(-90deg);
}

.progress-ring-bg {
  stroke: var(--border-card);
}

.progress-ring-fill {
  stroke: url(#accentGradientSvg, var(--accent-primary));
  stroke: var(--accent-primary);
  transition: stroke-dashoffset 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.progress-ring-percentage {
  position: absolute;
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* Progress Bar */
.progress-bar-container {
  margin-bottom: 1.25rem;
}

.progress-bar-track {
  width: 100%;
  height: 8px;
  background: var(--border-card);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--accent-gradient-glow);
}

/* Stats Pills */
.stats-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-card);
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: var(--bg-input);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-card);
}

.stat-pill strong {
  color: var(--text-primary);
  font-weight: 700;
}

.pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.dot-urgent { background: var(--priority-high); box-shadow: 0 0 8px var(--priority-high); }
.dot-today { background: var(--due-today); box-shadow: 0 0 8px var(--due-today); }
.dot-completed { background: var(--priority-low); box-shadow: 0 0 8px var(--priority-low); }

/* ==========================================================================
   Task Creator Card
   ========================================================================== */

.creator-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-normal);
}

.creator-card:focus-within {
  border-color: var(--border-focus);
}

.creator-main-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.input-with-icon {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
  pointer-events: none;
}

.input-with-icon input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem 0.85rem 2.75rem;
  font-size: 0.96rem;
  font-family: inherit;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.input-with-icon input::placeholder {
  color: var(--text-muted);
}

.input-with-icon input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
  background: var(--bg-card-hover);
}

.btn-text-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-gradient);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.85rem 1.35rem;
  font-size: 0.94rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  box-shadow: var(--accent-gradient-glow);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px -4px rgba(99, 102, 241, 0.6);
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 0.75rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

/* Collapsible Details Row */
.creator-details {
  display: grid;
  grid-template-rows: 1fr;
  opacity: 1;
  transition: grid-template-rows 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease-out, margin-top 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  margin-top: 1.15rem;
}

.creator-details.collapsed {
  grid-template-rows: 0fr;
  opacity: 0;
  margin-top: 0;
  pointer-events: none;
}

.creator-details > * {
  overflow: hidden;
}

.details-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.85rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border-card);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-group textarea {
  resize: vertical;
  min-height: 52px;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent-primary);
}

.quick-due-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.chip-btn {
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: inherit;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-primary);
  border-color: var(--border-focus);
}

/* ==========================================================================
   Toolbar & Filter Controls
   ========================================================================== */

.toolbar-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.15rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
}

.toolbar-top {
  display: flex;
  gap: 0.85rem;
  align-items: center;
}

.search-box {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 0.9rem;
  color: var(--text-muted);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 0.65rem 2.25rem 0.65rem 2.45rem;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.clear-search {
  position: absolute;
  right: 0.85rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.2rem;
  border-radius: 50%;
}

.clear-search:hover {
  color: var(--text-primary);
}

.sort-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.sort-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.sort-select {
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  font-family: inherit;
  color: var(--text-primary);
  outline: none;
  cursor: pointer;
}

.sort-select:focus {
  border-color: var(--accent-primary);
}

/* Filter Row */
.filter-row {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.status-tabs {
  display: flex;
  gap: 0.4rem;
  background: var(--bg-input);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-card);
  overflow-x: auto;
}

.tab-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.tab-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.tab-count {
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.tab-btn.active .tab-count {
  background: rgba(99, 102, 241, 0.2);
  color: var(--accent-primary);
}

/* Category Chips */
.category-chips-scroll {
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  padding-bottom: 0.2rem;
  scrollbar-width: none;
}

.category-chips-scroll::-webkit-scrollbar {
  display: none;
}

.cat-chip {
  background: transparent;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-full);
  padding: 0.35rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.cat-chip:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.cat-chip.active {
  background: var(--accent-primary);
  color: #FFFFFF;
  border-color: var(--accent-primary);
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.35);
}

/* ==========================================================================
   Task Items & List
   ========================================================================== */

.tasks-container {
  min-height: 200px;
}

.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.task-item {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-start;
  gap: 0.95rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
  animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.task-item.removing {
  animation: slideOut 0.28s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideOut {
  to {
    opacity: 0;
    transform: translateX(30px) scale(0.95);
    max-height: 0;
    padding-top: 0;
    padding-bottom: 0;
    margin-bottom: 0;
  }
}

.task-item:hover {
  border-color: rgba(99, 102, 241, 0.35);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.task-item.priority-high {
  border-left: 4px solid var(--priority-high);
}

.task-item.priority-medium {
  border-left: 4px solid var(--priority-medium);
}

.task-item.priority-low {
  border-left: 4px solid var(--priority-low);
}

.task-item.completed {
  opacity: 0.65;
  background: rgba(17, 24, 39, 0.45);
}

[data-theme="light"] .task-item.completed {
  background: rgba(241, 245, 249, 0.6);
}

/* Checkbox button */
.task-checkbox-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.2rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 0.1rem;
  transition: transform var(--transition-spring), color var(--transition-fast);
}

.task-checkbox-btn:hover {
  color: var(--accent-primary);
  transform: scale(1.15);
}

.checkbox-box {
  width: 22px;
  height: 22px;
  border: 2px solid var(--text-muted);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.task-item.completed .checkbox-box {
  background: var(--priority-low);
  border-color: var(--priority-low);
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.checkbox-check {
  color: #FFFFFF;
  opacity: 0;
  transform: scale(0.5);
  transition: all var(--transition-spring);
}

.task-item.completed .checkbox-check {
  opacity: 1;
  transform: scale(1);
}

/* Task Content */
.task-content {
  flex: 1;
  min-width: 0;
}

.task-title {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-word;
  transition: all var(--transition-fast);
  line-height: 1.35;
}

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-description {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  word-break: break-word;
  line-height: 1.45;
  white-space: pre-line;
}

/* Metadata badges */
.task-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.meta-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.badge-category {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-secondary);
  border: 1px solid var(--border-card);
}

.badge-priority-high {
  background: var(--priority-high-bg);
  color: var(--priority-high);
  border: 1px solid var(--priority-high-border);
}

.badge-priority-medium {
  background: var(--priority-medium-bg);
  color: var(--priority-medium);
  border: 1px solid var(--priority-medium-border);
}

.badge-priority-low {
  background: var(--priority-low-bg);
  color: var(--priority-low);
  border: 1px solid var(--priority-low-border);
}

.badge-due {
  background: rgba(255, 255, 255, 0.05);
  color: var(--due-future);
  border: 1px solid var(--border-card);
}

.badge-due.overdue {
  background: rgba(239, 68, 68, 0.15);
  color: var(--due-overdue);
  border-color: rgba(239, 68, 68, 0.3);
  font-weight: 700;
}

.badge-due.today {
  background: rgba(245, 158, 11, 0.15);
  color: var(--due-today);
  border-color: rgba(245, 158, 11, 0.3);
  font-weight: 700;
}

/* Task Actions */
.task-actions {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-shrink: 0;
}

.action-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.action-btn.star-btn.starred {
  color: #FBBF24;
}

.action-btn.star-btn.starred:hover {
  color: #F59E0B;
}

.action-btn.delete-btn:hover {
  color: var(--priority-high);
  background: rgba(239, 68, 68, 0.12);
}

/* Empty State */
.empty-state {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px dashed var(--border-card);
  border-radius: var(--radius-lg);
  padding: 3.5rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  animation: fadeIn 0.3s ease-out;
}

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

.empty-icon-wrapper {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.empty-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  max-width: 360px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.app-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 1rem 0.5rem;
  border-top: 1px solid var(--border-card);
  margin-top: 1rem;
}

/* ==========================================================================
   Modal Dialog
   ========================================================================== */

.modal-dialog {
  border: none;
  background: transparent;
  padding: 0;
  margin: auto;
  max-width: 500px;
  width: 90%;
  border-radius: var(--radius-lg);
}

.modal-dialog::backdrop {
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-lg);
  animation: modalScaleUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalScaleUp {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-top: 0.85rem;
}

.modal-card .form-group {
  margin-bottom: 0.85rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(17, 24, 39, 0.95);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: #FFFFFF;
  border: 1px solid var(--border-card);
  box-shadow: var(--shadow-lg);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 1000;
  font-size: 0.88rem;
  font-weight: 500;
  animation: toastIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 15px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.toast-action {
  background: var(--accent-primary);
  border: none;
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.8rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toast-action:hover {
  background: var(--accent-primary-hover);
}

.toast-close {
  background: transparent;
  border: none;
  color: #9CA3AF;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toast-close:hover {
  color: #FFFFFF;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.hidden {
  display: none !important;
}

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 640px) {
  .app-wrapper {
    padding: 1.5rem 1rem 2.5rem;
    gap: 1.25rem;
  }

  .brand-title {
    font-size: 1.5rem;
  }

  .creator-main-row {
    flex-wrap: wrap;
  }

  .input-with-icon {
    width: 100%;
    flex: 1 1 100%;
  }

  .btn-text-icon,
  .btn-primary {
    flex: 1;
    justify-content: center;
  }

  .details-grid {
    grid-template-columns: 1fr;
  }

  .toolbar-top {
    flex-direction: column;
    align-items: stretch;
  }

  .sort-wrapper {
    justify-content: space-between;
  }

  .sort-select {
    flex: 1;
  }

  .stats-header {
    flex-direction: column-reverse;
    align-items: flex-start;
  }

  .stats-circular {
    align-self: flex-end;
    margin-top: -3.5rem;
  }

  .modal-row {
    grid-template-columns: 1fr;
  }
}