/* ==========================================================================
   TaskPulse Pro — Design System & Custom Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Variables & Theme Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Dark Default */
  --bg-main: #0b0f19;
  --bg-card: rgba(23, 32, 54, 0.7);
  --bg-card-hover: rgba(30, 42, 69, 0.85);
  --bg-input: rgba(15, 23, 42, 0.8);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(99, 102, 241, 0.4);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Brand Accents */
  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #8b5cf6;
  --accent-glow: rgba(99, 102, 241, 0.35);
  
  /* Status & Priority Colors */
  --priority-high: #f43f5e;
  --priority-high-bg: rgba(244, 63, 94, 0.15);
  --priority-medium: #f59e0b;
  --priority-medium-bg: rgba(245, 158, 11, 0.15);
  --priority-low: #10b981;
  --priority-low-bg: rgba(16, 185, 129, 0.15);
  
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.3);
  --danger: #ef4444;
  --info: #06b6d4;

  /* Geometry & Glassmorphism */
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 25px var(--accent-glow);
  
  --glass-backdrop: blur(16px);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Plus Jakarta Sans', system-ui, sans-serif;
}

/* Light Theme Tokens Overrides */
[data-theme="light"] {
  --bg-main: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-input: #ffffff;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-highlight: rgba(99, 102, 241, 0.5);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 25px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);
}

/* --------------------------------------------------------------------------
   Global Reset & Base Setup
   -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Background Ambient Glow Orbs */
.app-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.35;
  animation: floatOrb 20s ease-in-out infinite alternate;
}

.blob-1 {
  width: 500px;
  height: 500px;
  background: var(--accent-primary);
  top: -100px;
  left: -100px;
}

.blob-2 {
  width: 450px;
  height: 450px;
  background: var(--accent-secondary);
  bottom: -100px;
  right: -50px;
  animation-delay: -7s;
}

.blob-3 {
  width: 350px;
  height: 350px;
  background: var(--info);
  top: 40%;
  left: 45%;
  animation-delay: -14s;
}

@keyframes floatOrb {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(60px, 40px) scale(1.1); }
  100% { transform: translate(-40px, -60px) scale(0.95); }
}

/* Canvas Confetti Layer */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
}

/* --------------------------------------------------------------------------
/* --------------------------------------------------------------------------
   App Layout Container
   -------------------------------------------------------------------------- */
.app-container {
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: clamp(14px, 2.5vw, 28px);
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2vw, 24px);
  min-height: 100vh;
}

/* --------------------------------------------------------------------------
   Header Navigation
   -------------------------------------------------------------------------- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px clamp(16px, 2vw, 24px);
  background: var(--bg-card);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 28px);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  user-select: none;
}

.logo-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 15px var(--accent-glow);
  transition: transform var(--transition-bounce);
  flex-shrink: 0;
}

.logo-icon.mini {
  width: 34px;
  height: 34px;
  border-radius: 9px;
}

.brand-logo:hover .logo-icon {
  transform: rotate(10deg) scale(1.08);
}

.brand-name {
  font-family: var(--font-heading);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #ffffff;
  letter-spacing: 0.08em;
}

.greeting-box h1 {
  font-family: var(--font-heading);
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

.greeting-box p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* Header Right: Search & Action Buttons */
.header-right {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.5vw, 16px);
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  width: clamp(200px, 24vw, 320px);
}

.search-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
  transition: color var(--transition-fast);
}

.search-box input {
  width: 100%;
  padding: 10px 40px 10px 42px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  color: var(--text-primary);
  font-size: 0.88rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-box input:focus + .shortcut-key,
.search-box:focus-within .search-icon {
  color: var(--accent-primary);
}

.shortcut-key {
  position: absolute;
  right: 12px;
  background: var(--border-color);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 4px;
  pointer-events: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

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

.icon-btn:active {
  transform: scale(0.95);
}

.mobile-nav-toggle {
  display: none; /* hidden on laptop/desktop */
}

.mini-icon-btn {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  border: none;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.mini-icon-btn:hover {
  background: var(--accent-primary);
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   Mobile Drawer Overlay Backdrop
   -------------------------------------------------------------------------- */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1040;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.sidebar-open .drawer-backdrop {
  opacity: 1;
  pointer-events: auto;
}

body.sidebar-open {
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   Main Grid Layout & Sidebar
   -------------------------------------------------------------------------- */
.main-layout {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: clamp(16px, 2.5vw, 28px);
  align-items: start;
  width: 100%;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

@media (min-width: 992px) {
  .sidebar {
    position: sticky;
    top: 24px;
    align-self: start;
    max-height: calc(100vh - 48px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
    padding-right: 4px;
  }

  .sidebar::-webkit-scrollbar {
    width: 5px;
  }

  .sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 999px;
  }
}

.drawer-mobile-header {
  display: none; /* hidden on desktop */
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 4px;
}

.sidebar-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.sidebar-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.card-header .card-title {
  margin-bottom: 0;
}

/* Progress Ring Visualizer */
.progress-card {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.progress-ring-container {
  position: relative;
  width: 130px;
  height: 130px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.progress-ring-bg {
  fill: none;
  stroke: var(--border-color);
}

.progress-ring-fill {
  fill: none;
  stroke: url(#progress-gradient);
  stroke: var(--accent-primary);
  stroke-linecap: round;
  stroke-dasharray: 326.72; /* 2 * PI * 52 */
  stroke-dashoffset: 326.72;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
  transition: stroke-dashoffset 0.8s cubic-bezier(0.34, 1.25, 0.64, 1);
}

.progress-text {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#progress-percent {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
}

#progress-status-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stats-summary {
  display: flex;
  align-items: center;
  justify-content: space-around;
  width: 100%;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.stat-divider {
  width: 1px;
  height: 24px;
  background: var(--border-color);
}

/* Category List Menu */
.category-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.category-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  transform: translateX(4px);
}

.category-item.active {
  background: var(--accent-glow);
  color: var(--text-primary);
  font-weight: 600;
  border: 1px solid var(--border-highlight);
}

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

.cat-badge-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.cat-count {
  font-size: 0.75rem;
  background: var(--border-color);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

/* Priority Filter Pills */
.priority-pills {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.priority-pill {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.priority-pill:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.priority-pill.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.dot.high { background: var(--priority-high); box-shadow: 0 0 8px var(--priority-high); }
.dot.medium { background: var(--priority-medium); box-shadow: 0 0 8px var(--priority-medium); }
.dot.low { background: var(--priority-low); box-shadow: 0 0 8px var(--priority-low); }

/* Streak Card */
.streak-badge {
  display: flex;
  align-items: center;
  gap: 14px;
}

.fire-icon {
  font-size: 2rem;
  animation: pulseFire 2s ease-in-out infinite alternate;
}

@keyframes pulseFire {
  0% { transform: scale(1); filter: drop-shadow(0 0 2px rgba(245, 158, 11, 0.4)); }
  100% { transform: scale(1.18); filter: drop-shadow(0 0 10px rgba(245, 158, 11, 0.8)); }
}

.streak-info {
  display: flex;
  flex-direction: column;
}

.streak-count {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.streak-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* Sidebar Action Buttons */
.sidebar-actions {
  display: flex;
  gap: 10px;
}

.secondary-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.danger-text:hover {
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.4);
}

/* --------------------------------------------------------------------------
   Content Area & Add Task Panel
   -------------------------------------------------------------------------- */
.content-area {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.add-task-panel {
  background: var(--bg-card);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.add-task-panel:focus-within {
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-glow);
}

#add-task-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-main-row {
  display: flex;
  gap: 12px;
}

.input-wrapper {
  flex: 1;
  position: relative;
}

#task-title-input {
  width: 100%;
  padding: 14px 18px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-family);
  outline: none;
  transition: all var(--transition-fast);
}

#task-title-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.primary-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border: none;
  color: #ffffff;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 18px var(--accent-glow);
  transition: all var(--transition-fast);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(99, 102, 241, 0.5);
  filter: brightness(1.1);
}

.primary-btn:active {
  transform: scale(0.97);
}

.form-options-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(135px, 1fr));
  gap: 12px;
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.option-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.select-dropdown,
.date-picker,
.sub-text-input {
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  transition: all var(--transition-fast);
}

.select-dropdown:focus,
.date-picker:focus,
.sub-text-input:focus {
  border-color: var(--accent-primary);
}

/* --------------------------------------------------------------------------
   View Filter & Sort Toolbar
   -------------------------------------------------------------------------- */
.view-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 4px 0;
}

.filter-tabs {
  display: flex;
  background: var(--bg-card);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  max-width: 100%;
}

.filter-tabs::-webkit-scrollbar {
  display: none;
}

.filter-tab {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--accent-glow);
}

.tab-badge {
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.18);
}

.sort-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.select-dropdown.mini {
  padding: 6px 10px;
}

.active-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--accent-glow);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-primary);
}

.text-link-btn {
  background: none;
  border: none;
  color: var(--accent-primary);
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Task Item Cards & List
   -------------------------------------------------------------------------- */
.task-list-wrapper {
  position: relative;
  min-height: 250px;
}

.task-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.task-item {
  background: var(--bg-card);
  backdrop-filter: var(--glass-backdrop);
  -webkit-backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  animation: slideInUp 0.35s cubic-bezier(0.34, 1.25, 0.64, 1);
  position: relative;
  overflow: hidden;
}

.task-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(18px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.task-item.exit-animation {
  opacity: 0;
  transform: translateX(40px) scale(0.95);
  transition: all 0.3s ease;
}

.task-main-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.task-left {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  flex: 1;
  min-width: 0;
}

/* Custom Checkbox Animation */
.custom-checkbox {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  border: 2px solid var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all var(--transition-bounce);
  background: transparent;
}

.custom-checkbox:hover {
  border-color: var(--accent-primary);
  transform: scale(1.12);
}

.custom-checkbox svg {
  width: 14px;
  height: 14px;
  color: #ffffff;
  opacity: 0;
  transform: scale(0.4) rotate(-20deg);
  transition: all var(--transition-bounce);
}

.task-item.completed .custom-checkbox {
  background: var(--success);
  border-color: var(--success);
  box-shadow: 0 0 12px var(--success-glow);
}

.task-item.completed .custom-checkbox svg {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

/* Task Content & Typography */
.task-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  min-width: 0;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.task-title-text {
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  transition: all var(--transition-fast);
  cursor: pointer;
  word-break: break-word;
  overflow-wrap: anywhere;
}

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

.task-desc-text {
  font-size: 0.84rem;
  color: var(--text-secondary);
  word-break: break-word;
  overflow-wrap: anywhere;
}

/* Badges & Meta Row */
.task-meta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 2px;
}

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-category {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.badge-priority.high { background: var(--priority-high-bg); color: var(--priority-high); border: 1px solid rgba(244, 63, 94, 0.3); }
.badge-priority.medium { background: var(--priority-medium-bg); color: var(--priority-medium); border: 1px solid rgba(245, 158, 11, 0.3); }
.badge-priority.low { background: var(--priority-low-bg); color: var(--priority-low); border: 1px solid rgba(16, 185, 129, 0.3); }

.badge-due {
  background: var(--bg-input);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.badge-due.overdue {
  background: rgba(239, 68, 68, 0.15);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.4);
}

.badge-due.today {
  background: rgba(245, 158, 11, 0.15);
  color: var(--priority-medium);
  border-color: rgba(245, 158, 11, 0.4);
}

/* Action Button Group */
.task-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}

.task-item:hover .task-actions {
  opacity: 1;
}

.action-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-btn:hover {
  background: var(--bg-input);
  color: var(--text-primary);
  border-color: var(--border-color);
  transform: translateY(-1px);
}

.action-btn.delete-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.4);
}

/* --------------------------------------------------------------------------
   Subtask Section
   -------------------------------------------------------------------------- */
.subtasks-section {
  padding-top: 10px;
  border-top: 1px dashed var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.subtask-progress-bar-wrapper {
  height: 4px;
  background: var(--border-color);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.subtask-progress-bar-fill {
  height: 100%;
  background: var(--accent-primary);
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}

.subtasks-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 12px;
}

.subtask-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--text-secondary);
}

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

.mini-checkbox {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  border: 1.5px solid var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.subtask-item.completed .mini-checkbox {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.subtask-add-row {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.subtask-input {
  flex: 1;
  padding: 6px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.78rem;
  outline: none;
}

/* --------------------------------------------------------------------------
   Empty State
   -------------------------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  gap: 12px;
}

.empty-illustration {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-primary);
}

.empty-state h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
}

.empty-state p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 320px;
}

/* --------------------------------------------------------------------------
   Toast Notifications
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}

.toast {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 18px;
  background: var(--bg-card-hover);
  backdrop-filter: var(--glass-backdrop);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.88rem;
  box-shadow: var(--shadow-md);
  animation: toastIn 0.3s cubic-bezier(0.34, 1.25, 0.64, 1);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(20px) scale(0.9); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.toast-undo-btn {
  background: var(--accent-primary);
  border: none;
  color: #ffffff;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Modal Backdrop & Dialog
   -------------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1001;
  animation: fadeIn 0.2s ease;
}

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

.modal-card {
  width: calc(100% - 32px);
  max-width: 520px;
  max-height: 88vh;
  max-height: 88dvh;
  overflow-y: auto;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.modal-header h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

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

.color-picker-input {
  height: 42px;
  padding: 3px 6px;
  cursor: pointer;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  width: 100%;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

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

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}

.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Comprehensive Responsive Layout & Breakpoints
   -------------------------------------------------------------------------- */

/* 1. Large Laptops / Medium Desktops (992px - 1199px) */
@media (min-width: 992px) and (max-width: 1199px) {
  .main-layout {
    grid-template-columns: 280px 1fr;
  }
}

/* 2. Tablet Portrait & Mobile Screen Breakpoint (< 992px) */
@media (max-width: 991px) {
  .mobile-nav-toggle {
    display: flex;
  }

  .drawer-mobile-header {
    display: flex;
  }

  .main-layout {
    grid-template-columns: 1fr;
  }

  /* Off-canvas slide drawer for sidebar */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 320px;
    max-width: 86vw;
    height: 100vh;
    height: 100dvh;
    background: var(--bg-main);
    background-image: radial-gradient(circle at top right, rgba(99, 102, 241, 0.12), transparent 70%);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-right: 1px solid var(--border-color);
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.7);
    padding: 20px;
    z-index: 1050;
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  body.sidebar-open .sidebar,
  .sidebar.open {
    transform: translateX(0);
  }
}

/* 3. Small Tablets & Phones (< 768px) */
@media (max-width: 768px) {
  .app-header {
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 16px;
  }

  .greeting-box {
    display: none;
  }

  .header-right {
    flex: 1;
    justify-content: flex-end;
  }

  .search-box {
    flex: 1;
    max-width: 260px;
    min-width: 140px;
  }

  .shortcut-key {
    display: none;
  }

  .toast-container {
    bottom: 16px;
    right: 16px;
    left: 16px;
    width: auto;
  }

  .toast {
    width: 100%;
  }
}

/* 4. Mobile Phones (< 600px) */
@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }

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

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

  .view-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .sort-controls {
    justify-content: space-between;
    width: 100%;
  }

  .sort-controls .select-dropdown {
    flex: 1;
  }
}

/* 5. Extra-Small Mobile Devices (< 480px / 320px - 480px) */
@media (max-width: 480px) {
  .app-container {
    padding: 12px;
    gap: 14px;
  }

  .app-header {
    padding: 12px 14px;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .header-left {
    justify-content: space-between;
    width: 100%;
  }

  .header-right {
    width: 100%;
    justify-content: space-between;
  }

  .search-box {
    max-width: 100%;
    width: 100%;
    order: 2;
  }

  .header-actions {
    margin-left: auto;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .logo-icon {
    width: 38px;
    height: 38px;
  }

  .add-task-panel {
    padding: 16px;
  }

  .form-main-row {
    flex-direction: column;
    gap: 10px;
  }

  .primary-btn {
    width: 100%;
  }

  .form-options-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .task-item {
    padding: 14px;
  }

  .task-main-row {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .task-actions {
    align-self: flex-end;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 8px;
    width: 100%;
    justify-content: flex-end;
  }

  .modal-card {
    padding: 16px;
  }
}