/* ============================================
   Habit Planner - Styles
   ============================================ */

/* CSS Variables - Theme Colors */
:root {
  /* Pale Blue Theme with Beige Background */
  --primary: #3B82F6;
  --primary-dark: #1D4ED8;
  --primary-light: #93C5FD;
  --primary-lighter: #DBEAFE;
  --background: #E8DCCC;
  --surface: #F7F2EA;
  --surface-hover: #E5D9C9;
  --text-primary: #1E3A5F;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --success: #22C55E;
  --success-light: #DCFCE7;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --danger: #EF4444;
  --danger-light: #FEE2E2;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-index */
  --z-nav: 100;
  --z-modal: 200;
  --z-toast: 300;
}

/* Dark Mode */
[data-theme="dark"] {
  --primary: #60A5FA;
  --primary-dark: #3B82F6;
  --primary-light: #1D4ED8;
  --primary-lighter: #1E3A5F;
  --background: #0F172A;
  --surface: #1E293B;
  --surface-hover: #334155;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border: #334155;
  --success-light: #14532D;
  --warning-light: #713F12;
  --danger-light: #7F1D1D;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--background);
}

/* ============================================
   Header
   ============================================ */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
}

.header-left,
.header-right {
  width: 48px;
}

.header-center {
  flex: 1;
  display: flex;
  justify-content: center;
}

.user-level {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.level-badge {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.xp-bar {
  width: 60px;
  height: 6px;
  background-color: var(--border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.xp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

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

/* ============================================
   App Title
   ============================================ */
.app-title-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
  background-color: var(--surface);
}

.share-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: linear-gradient(135deg, #EC4899, #8B5CF6);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: white;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(236, 72, 153, 0.4);
}

.share-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(236, 72, 153, 0.5);
}

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

.share-btn .icon {
  width: 18px;
  height: 18px;
}

.help-main-btn {
  width: 42px;
  height: 42px;
  border: none;
  background: linear-gradient(135deg, #F59E0B, #EC4899);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: white;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 10px rgba(236, 72, 153, 0.5);
  animation: helpPulse 2s ease-in-out infinite;
  position: relative;
}

@keyframes helpPulse {
  0%, 100% { box-shadow: 0 2px 10px rgba(236, 72, 153, 0.5); }
  50% { box-shadow: 0 2px 20px rgba(245, 158, 11, 0.7), 0 0 8px rgba(236, 72, 153, 0.4); }
}

.help-main-btn:hover {
  transform: scale(1.15);
  box-shadow: 0 4px 16px rgba(236, 72, 153, 0.6);
  animation: none;
}

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

.help-main-btn .icon {
  width: 22px;
  height: 22px;
  stroke-width: 2.5;
}

.trophy-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: linear-gradient(135deg, #F59E0B, #EAB308);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: white;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.4);
}

.trophy-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.5);
}

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

.trophy-btn .icon {
  width: 18px;
  height: 18px;
}

.app-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #F59E0B, #EC4899, #8B5CF6, #3B82F6);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 4s ease infinite;
  margin: 0;
  text-shadow: 0 2px 10px rgba(236, 72, 153, 0.3);
}

@keyframes gradient-shift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* Dark mode adjustment for title */
[data-theme="dark"] .app-title {
  background: linear-gradient(135deg, #FBBF24, #F472B6, #A78BFA, #60A5FA);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 4s ease infinite;
}

/* ============================================
   Icon Button
   ============================================ */
.icon-btn {
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.icon-btn:hover {
  background-color: var(--surface-hover);
}

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

.icon {
  width: 24px;
  height: 24px;
}

/* Theme Toggle */
.theme-toggle .sun-icon {
  display: block;
}

.theme-toggle .moon-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: block;
}

/* ============================================
   Calendar Header
   ============================================ */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--surface);
}

.month-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  min-width: 160px;
  text-align: center;
}

.nav-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: var(--primary-lighter);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--primary);
  transition: all var(--transition-fast);
}

.nav-btn:hover {
  background-color: var(--primary-light);
  color: white;
}

.nav-btn .icon {
  width: 20px;
  height: 20px;
}

/* Days Row */
.days-row {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
}

.day-label {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
  flex: 1;
  padding: var(--spacing-md);
  padding-bottom: 80px;
  overflow-y: auto;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

/* ============================================
   Habits Grid (Today View)
   ============================================ */
.habits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  padding: var(--spacing-sm);
}

@media (max-width: 360px) {
  .habits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Habit Card */
.habit-card {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: all var(--transition);
  border: 3px solid transparent;
  overflow: hidden;
}

.habit-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  opacity: 0;
  transition: opacity var(--transition);
}

.habit-card:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.habit-card:hover::before {
  opacity: 0.1;
}

.habit-card:active {
  transform: scale(0.95);
}

.habit-card.completed {
  border-color: var(--success);
  background: linear-gradient(135deg, var(--success-light), var(--surface));
}

.habit-card.completed::after {
  content: '';
  position: absolute;
  top: 8px;
  right: 8px;
  width: 20px;
  height: 20px;
  background-color: var(--success);
  border-radius: var(--radius-full);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-size: 12px;
  background-repeat: no-repeat;
  background-position: center;
}

.habit-icon {
  font-size: 2.5rem;
  line-height: 1;
  z-index: 1;
  margin-bottom: var(--spacing-xs);
}

.habit-name {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
  max-width: 90%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  z-index: 1;
}

.habit-streak {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: white;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  z-index: 1;
}

.habit-streak.high {
  background: linear-gradient(135deg, var(--warning), #EAB308);
}

.habit-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: var(--border);
}

.habit-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--success));
  transition: width var(--transition);
}

/* Edit Button on Habit Card */
.habit-edit-btn {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  border: none;
  background: var(--surface);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: 2;
  box-shadow: var(--shadow-sm);
}

.habit-card:hover .habit-edit-btn {
  opacity: 1;
}

.habit-edit-btn .icon {
  width: 14px;
  height: 14px;
  color: var(--text-secondary);
}

/* Pagination Dots */
.pagination-dots {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
}

.pagination-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination-dot.active {
  width: 24px;
  background-color: var(--primary);
}

/* Empty State */
.empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--text-secondary);
}

.empty-state.show {
  display: flex;
}

.empty-icon {
  width: 80px;
  height: 80px;
  margin-bottom: var(--spacing-md);
  color: var(--text-muted);
}

.empty-icon svg {
  width: 100%;
  height: 100%;
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.empty-state p {
  font-size: 0.875rem;
}

/* ============================================
   Calendar View
   ============================================ */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  padding: var(--spacing-sm);
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.calendar-day:hover {
  background-color: var(--surface-hover);
}

.calendar-day.other-month {
  color: var(--text-muted);
}

.calendar-day.today {
  font-weight: 600;
  color: var(--primary);
}

.calendar-day.selected {
  background-color: var(--primary);
  color: white;
}

.calendar-day.has-completions::after {
  content: '';
  position: absolute;
  bottom: 4px;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background-color: var(--success);
}

.calendar-day.all-completed::after {
  background-color: var(--primary);
  width: 8px;
  height: 8px;
}

/* Habit List Mini */
.habit-list-mini {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
}

.habit-list-mini h3 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.habit-mini-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-xs);
  background-color: var(--surface-hover);
}

.habit-mini-item.completed {
  background-color: var(--success-light);
}

.habit-mini-icon {
  font-size: 1.25rem;
}

.habit-mini-name {
  flex: 1;
  font-size: 0.875rem;
}

.habit-mini-check {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-full);
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.habit-mini-item.completed .habit-mini-check {
  background-color: var(--success);
  border-color: var(--success);
  color: white;
}

/* ============================================
   Stats View
   ============================================ */
.stats-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.stats-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.stat-card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.stat-value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.chart-container {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.chart-container h3 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.chart-container canvas {
  max-height: 200px;
}

/* Heatmap */
.heatmap {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}

.heatmap-cell {
  aspect-ratio: 1;
  border-radius: 2px;
  background-color: var(--border);
}

.heatmap-cell.level-1 {
  background-color: var(--primary-lighter);
}

.heatmap-cell.level-2 {
  background-color: var(--primary-light);
}

.heatmap-cell.level-3 {
  background-color: var(--primary);
}

.heatmap-cell.level-4 {
  background-color: var(--primary-dark);
}

/* Habit Stats List */
.habits-stats-list {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.habit-stat-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border);
}

.habit-stat-item:last-child {
  border-bottom: none;
}

.habit-stat-icon {
  font-size: 1.5rem;
}

.habit-stat-info {
  flex: 1;
}

.habit-stat-name {
  font-weight: 500;
  margin-bottom: 2px;
}

.habit-stat-details {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.habit-stat-streak {
  text-align: right;
}

.habit-stat-streak-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.habit-stat-streak-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ============================================
   Settings View
   ============================================ */
.settings-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.settings-group {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.settings-group h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border);
}

.setting-item:last-child {
  border-bottom: none;
}

.setting-item.danger span {
  color: var(--danger);
}

.about-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  width: 48px;
  height: 28px;
  display: inline-block;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-switch .slider {
  position: absolute;
  inset: 0;
  background-color: var(--border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--transition);
}

.toggle-switch .slider::before {
  content: '';
  position: absolute;
  left: 4px;
  top: 4px;
  width: 20px;
  height: 20px;
  background-color: white;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition);
}

.toggle-switch input:checked + .slider {
  background-color: var(--primary);
}

.toggle-switch input:checked + .slider::before {
  transform: translateX(20px);
}

/* ============================================
   Bottom Navigation
   ============================================ */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px;
  display: flex;
  background-color: var(--surface);
  border-top: 1px solid var(--border);
  padding: var(--spacing-sm) var(--spacing-md);
  padding-bottom: max(var(--spacing-sm), env(safe-area-inset-bottom));
  z-index: var(--z-nav);
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--spacing-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.nav-item:hover {
  color: var(--text-secondary);
}

.nav-item.active {
  color: var(--primary);
}

.nav-item .icon {
  width: 24px;
  height: 24px;
}

.nav-item span {
  font-size: 0.65rem;
  font-weight: 500;
}

/* ============================================
   Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

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

.modal {
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  background-color: var(--surface);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  display: flex;
  flex-direction: column;
  transform: translateY(100%);
  transition: transform var(--transition);
}

.modal-overlay.show .modal {
  transform: translateY(0);
}

.modal-small {
  max-height: 50vh;
}

.modal-large {
  max-height: 95vh;
}

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

.modal-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

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

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  border-top: 1px solid var(--border);
}

.modal-footer .btn {
  flex: 1;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  opacity: 0.9;
}

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

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

.btn-danger {
  background-color: var(--danger);
  color: white;
}

.btn-danger:hover {
  opacity: 0.9;
}

/* ============================================
   Form Elements
   ============================================ */
.search-container {
  position: relative;
  margin-bottom: var(--spacing-md);
}

.search-icon {
  position: absolute;
  left: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--text-muted);
}

.search-container input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  padding-left: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background-color: var(--surface-hover);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.search-container input:focus {
  outline: none;
  border-color: var(--primary);
}

/* Category Icons */
.category-icons {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  overflow-x: auto;
  padding-bottom: var(--spacing-xs);
}

.category-btn {
  width: 44px;
  height: 44px;
  border: 2px solid var(--border);
  background-color: var(--surface);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.category-btn svg {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
}

.category-btn:hover {
  border-color: var(--primary-light);
}

.category-btn.active {
  border-color: var(--primary);
  background-color: var(--primary-lighter);
}

.category-btn.active svg {
  color: var(--primary);
}

/* Preset Habits */
.preset-habits {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  max-height: 200px;
  overflow-y: auto;
  margin-bottom: var(--spacing-md);
}

.preset-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.preset-item:hover {
  background-color: var(--surface-hover);
}

.preset-icon {
  font-size: 1.25rem;
}

.preset-name {
  flex: 1;
  font-size: 0.875rem;
}

.preset-add {
  width: 24px;
  height: 24px;
  border: none;
  background-color: var(--primary-lighter);
  border-radius: var(--radius-full);
  color: var(--primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Custom Habit Form */
.custom-habit-form {
  display: none;
}

.custom-habit-form.show {
  display: block;
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="time"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  background-color: var(--surface);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group textarea {
  resize: vertical;
  min-height: 60px;
}

/* Emoji Picker */
.emoji-picker {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  max-height: 120px;
  overflow-y: auto;
  padding: var(--spacing-xs);
  background-color: var(--surface-hover);
  border-radius: var(--radius);
}

.emoji-btn {
  width: 36px;
  height: 36px;
  border: 2px solid transparent;
  background: transparent;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
}

.emoji-btn:hover {
  background-color: var(--surface);
}

.emoji-btn.selected {
  border-color: var(--primary);
  background-color: var(--primary-lighter);
}

/* Days Selector */
.days-selector {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.day-checkbox {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--spacing-xs);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.75rem;
  transition: all var(--transition-fast);
}

.day-checkbox:has(input:checked) {
  border-color: var(--primary);
  background-color: var(--primary-lighter);
  color: var(--primary);
}

.day-checkbox input {
  display: none;
}

/* Checkbox Label */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  font-size: 0.875rem;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

/* ============================================
   Toast Notifications
   ============================================ */
.toast-container {
  position: fixed;
  top: var(--spacing-md);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  width: calc(100% - 32px);
  max-width: 400px;
}

.toast {
  background-color: var(--surface);
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: slideIn var(--transition) ease;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.toast.warning {
  border-left: 4px solid var(--warning);
}

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

/* ============================================
   Install Prompt
   ============================================ */
.install-prompt {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 400px;
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-modal);
  display: none;
}

.install-prompt.show {
  display: block;
  animation: slideUp var(--transition) ease;
}

.install-prompt p {
  margin-bottom: var(--spacing-md);
  font-size: 0.875rem;
}

.install-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.install-buttons .btn {
  flex: 1;
}

@keyframes slideUp {
  from {
    transform: translateX(-50%) translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
  }
}

/* ============================================
   Detail Modal Content
   ============================================ */
.detail-content {
  text-align: center;
  padding: var(--spacing-md);
}

.detail-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.detail-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.detail-input-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.detail-input {
  width: 100px;
  padding: var(--spacing-sm);
  border: 2px solid var(--primary);
  border-radius: var(--radius);
  font-size: 1.5rem;
  font-weight: 600;
  text-align: center;
  color: var(--primary);
}

.detail-unit {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.detail-target {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Timer Display */
.timer-display {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  margin-bottom: var(--spacing-md);
}

.timer-controls {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
}

.timer-btn {
  width: 48px;
  height: 48px;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.timer-btn.start {
  background-color: var(--success);
  color: white;
}

.timer-btn.pause {
  background-color: var(--warning);
  color: white;
}

.timer-btn.reset {
  background-color: var(--surface-hover);
  color: var(--text-secondary);
}

.timer-btn .icon {
  width: 24px;
  height: 24px;
}

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

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.animate-pulse {
  animation: pulse 0.5s ease;
}

.animate-bounce {
  animation: bounce 0.5s ease;
}

/* ============================================
   Other Apps Button
   ============================================ */
.other-apps-btn {
  position: fixed;
  bottom: 90px;
  right: 80px;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: linear-gradient(135deg, #10B981, #059669);
  color: white;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
  transition: all var(--transition-fast);
  z-index: var(--z-nav);
}

.other-apps-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.5);
}

.other-apps-btn:active {
  transform: translateY(0);
}

.other-apps-btn .icon {
  width: 16px;
  height: 16px;
}

/* Adjust position for safe area on mobile */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
  .other-apps-btn {
    bottom: calc(90px + env(safe-area-inset-bottom));
  }
}

/* ============================================
   Help Modal Content
   ============================================ */
.help-content {
  padding: var(--spacing-sm);
}

.help-section {
  margin-bottom: var(--spacing-lg);
}

.help-section h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--primary-lighter);
}

.help-card {
  background-color: var(--surface-hover);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.help-card h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.help-card p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.help-card p:last-child {
  margin-bottom: 0;
}

.help-card ul,
.help-card ol {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  padding-left: var(--spacing-md);
  margin: 0;
}

.help-card li {
  margin-bottom: var(--spacing-xs);
}

.help-card li:last-child {
  margin-bottom: 0;
}

.help-card.warning {
  background-color: var(--danger-light);
  border-left: 3px solid var(--danger);
}

.help-tip {
  font-size: 0.75rem;
  color: var(--primary);
  font-style: italic;
  margin-top: var(--spacing-xs);
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.help-item {
  font-size: 0.8125rem;
  padding: var(--spacing-sm);
  background-color: var(--surface-hover);
  border-radius: var(--radius-sm);
}

.help-item kbd {
  display: inline-block;
  padding: 2px 6px;
  font-size: 0.75rem;
  font-family: monospace;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  box-shadow: 0 1px 0 var(--border);
  margin-right: var(--spacing-xs);
}

.help-tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.help-tip-card {
  background-color: var(--surface-hover);
  border-radius: var(--radius);
  padding: var(--spacing-sm);
  text-align: center;
}

.help-tip-card .tip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.help-tip-card strong {
  display: block;
  font-size: 0.8125rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.help-tip-card p {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin: 0;
}

.help-footer {
  text-align: center;
  padding: var(--spacing-md);
  border-top: 1px solid var(--border);
  margin-top: var(--spacing-md);
}

.help-footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.help-footer p:last-child {
  margin-bottom: 0;
}

/* ============================================
   Accessibility
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --border: #000;
    --text-secondary: #000;
  }

  .habit-card {
    border: 2px solid var(--text-primary);
  }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
  .header,
  .bottom-nav,
  .modal-overlay,
  .toast-container,
  .install-prompt {
    display: none !important;
  }

  .main-content {
    padding-bottom: 0;
  }
}

/* ============================================
   Achievements
   ============================================ */
.achievements-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.achievements-header h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.achievements-counter {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-lighter);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-sm);
}

.achievement-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-sm);
  border-radius: var(--radius);
  transition: transform var(--transition-fast);
}

.achievement-item.unlocked {
  background: var(--primary-lighter);
}

.achievement-item.locked {
  opacity: 0.4;
  filter: grayscale(1);
}

.achievement-badge {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.achievement-label {
  font-size: 0.6rem;
  font-weight: 500;
  color: var(--text-secondary);
  line-height: 1.2;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.achievement-item.unlocked .achievement-label {
  color: var(--text-primary);
  font-weight: 600;
}

/* Achievement Celebration Overlay */
.achievement-celebration {
  position: fixed;
  inset: 0;
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.7);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.achievement-celebration.show {
  opacity: 1;
  visibility: visible;
}

.achievement-confetti {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.confetti-particle {
  position: absolute;
  top: -10px;
  left: var(--x);
  border-radius: 2px;
  animation: confettiFall var(--duration) ease-in var(--delay) forwards;
  transform: rotate(var(--rotation));
}

@keyframes confettiFall {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

.achievement-popup {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--spacing-xl);
  max-width: 300px;
  transform: scale(0.5);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.achievement-celebration.show .achievement-popup {
  transform: scale(1);
}

.achievement-badge-large {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: var(--spacing-md);
  animation: badgeBounce 0.6s ease 0.2s both;
}

@keyframes badgeBounce {
  0% { transform: scale(0) rotate(-15deg); }
  50% { transform: scale(1.3) rotate(5deg); }
  70% { transform: scale(0.9) rotate(-3deg); }
  100% { transform: scale(1) rotate(0); }
}

.achievement-unlock-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: #F59E0B;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-xs);
}

.achievement-popup .achievement-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--spacing-sm);
}

.achievement-popup .achievement-description {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-lg);
}

.achievement-dismiss {
  min-width: 120px;
}

@media (prefers-reduced-motion: reduce) {
  .confetti-particle,
  .achievement-badge-large,
  .achievement-popup {
    animation: none !important;
  }
  .achievement-celebration.show .achievement-popup {
    transform: scale(1);
  }
}