/* ==============================================
   Habit Snowball — Design System
   深色太空主題 · 科技感字體 · 微動畫
   ============================================== */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+TC:wght@300;400;500;700&family=Orbitron:wght@400;500;600;700;800;900&display=swap');

/* ---------- CSS Custom Properties ---------- */
:root {
  --bg-primary: #0a0e27;
  --bg-secondary: #111638;
  --bg-card: rgba(17, 22, 56, 0.7);
  --bg-card-hover: rgba(26, 33, 80, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.04);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-1: #a8d8ea;
  --accent-2: #e0f0ff;
  --accent-positive: #34d399;
  --accent-warning: #f59e0b;
  --accent-negative: #ef4444;

  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(168, 216, 234, 0.15);

  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-smooth: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

  --font-display: 'Orbitron', sans-serif;
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Noto Sans TC', 'Inter', sans-serif;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Background stars effect */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 40% 70%, rgba(255,255,255,0.2) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 20%, rgba(255,255,255,0.25) 0%, transparent 100%),
    radial-gradient(1px 1px at 80% 50%, rgba(255,255,255,0.15) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 15% 80%, rgba(255,255,255,0.2) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 10%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 50% 50%, rgba(168,216,234,0.15) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* ---------- Layout ---------- */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px;
  padding-bottom: 100px;
}

/* ---------- Hero Section ---------- */
#hero-section {
  position: relative;
  text-align: center;
  padding: 24px 0 20px;
}

.canvas-container {
  position: relative;
  width: 100%;
  height: 250px;
  margin: 0 auto;
}

#snowball-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.score-display {
  margin-top: 8px;
}

#total-score {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  letter-spacing: 2px;
}

.score-label {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* Stage Display */
.stage-display {
  margin-top: 16px;
}

#stage-name {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
}

.stage-progress {
  margin-top: 8px;
  height: 6px;
  background: var(--bg-glass);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

#stage-progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
}

#stage-progress-fill::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  width: 20px;
  height: 100%;
  background: rgba(255,255,255,0.4);
  filter: blur(4px);
  border-radius: var(--radius-full);
}

#next-stage-info {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ---------- Stats Bar ---------- */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 20px;
}

.stat-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 8px;
  text-align: center;
  transition: all var(--transition-normal);
}

.stat-item:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-label {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

#streak-bonus {
  display: none;
  font-size: 10px;
  color: var(--accent-warning);
  background: rgba(245, 158, 11, 0.1);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  margin-top: 4px;
}

/* ---------- Navigation ---------- */
.nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(10, 14, 39, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: center;
  gap: 0;
  padding: 8px 16px;
  padding-bottom: max(8px, env(safe-area-inset-bottom));
  z-index: 100;
}

.nav-item {
  flex: 1;
  max-width: 120px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-muted);
  font-size: 11px;
  border: none;
  background: none;
  font-family: var(--font-body);
}

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

.nav-item.active {
  color: var(--accent-1);
}

.nav-icon {
  font-size: 22px;
  line-height: 1;
}

/* ---------- View Sections ---------- */
.view-section {
  display: none;
}

.view-section.active {
  display: block;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  margin: 24px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ---------- Habit Cards ---------- */
.habit-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: 12px;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

.habit-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card);
}

.habit-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.habit-emoji {
  font-size: 32px;
  line-height: 1;
}

.habit-info {
  flex: 1;
}

.habit-name {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.habit-count {
  font-size: 12px;
  color: var(--text-muted);
}

.habit-delete {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  opacity: 0;
}

.habit-card:hover .habit-delete {
  opacity: 1;
}

.habit-delete:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--accent-negative);
}

.habit-actions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
  font-family: var(--font-body);
  font-size: 13px;
}

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

.action-icon {
  font-size: 24px;
  line-height: 1;
}

.action-btn.action-resist:hover {
  background: rgba(52, 211, 153, 0.1);
  border-color: rgba(52, 211, 153, 0.3);
  color: var(--accent-positive);
  box-shadow: 0 0 20px rgba(52, 211, 153, 0.1);
}

.action-btn.action-urge:hover {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
  color: var(--accent-warning);
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.1);
}

.action-btn.action-relapse:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--accent-negative);
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.1);
}

/* ---------- Add Habit Button ---------- */
#btn-add-habit {
  width: 100%;
  padding: 14px;
  border-radius: var(--radius-lg);
  border: 2px dashed var(--border-hover);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 15px;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

#btn-add-habit:hover {
  border-color: var(--accent-1);
  color: var(--accent-1);
  background: rgba(168, 216, 234, 0.05);
}

/* ---------- Modal ---------- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.show {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 28px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-hover);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(168, 216, 234, 0.1);
}

.type-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.type-option {
  position: relative;
}

.type-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.type-option label {
  display: block;
  padding: 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 14px;
}

.type-option input:checked + label {
  border-color: var(--accent-1);
  background: rgba(168, 216, 234, 0.1);
  color: var(--accent-1);
}

.emoji-picker {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.emoji-option {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-glass);
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.emoji-option:hover {
  border-color: var(--border-hover);
  background: var(--bg-glass-hover);
  transform: scale(1.1);
}

.emoji-option.selected {
  border-color: var(--accent-1);
  background: rgba(168, 216, 234, 0.15);
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  flex: 1;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  border: none;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  color: var(--bg-primary);
}

.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(168, 216, 234, 0.3);
}

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

.btn-secondary:hover {
  background: var(--bg-glass-hover);
  color: var(--text-primary);
}

/* ---------- Note Modal ---------- */
.note-modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.note-modal-action-emoji {
  font-size: 36px;
  line-height: 1;
}

.note-modal-subtitle {
  font-size: 13px;
  color: var(--text-muted);
}

/* ---------- Awareness Modal ---------- */
.awareness-content {
  text-align: center;
  max-width: 400px !important;
}

.awareness-tip {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 8px;
  line-height: 1.5;
}

.countdown-wrapper {
  margin: 24px auto;
  display: flex;
  justify-content: center;
  align-items: center;
}

.countdown-circle {
  position: relative;
  width: 120px;
  height: 120px;
}

.countdown-svg {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}

.countdown-bg-circle {
  fill: none;
  stroke: rgba(255, 255, 255, 0.08);
  stroke-width: 6;
}

.countdown-progress-circle {
  fill: none;
  stroke: var(--accent-1);
  stroke-width: 6;
  stroke-linecap: round;
  stroke-dasharray: 283; /* 2 * PI * r (r=45) => 282.7 */
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.1s linear, stroke var(--transition-slow);
}

.countdown-number {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 36px;
  font-weight: 700;
  color: var(--text-primary);
  font-family: monospace;
}

.btn-evolve-now {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  box-shadow: 0 0 20px rgba(52, 211, 153, 0.4);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-evolve-now:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(52, 211, 153, 0.6);
}

.note-editor-wrapper {
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-glass);
  transition: border-color var(--transition-fast);
}

.note-editor-wrapper:focus-within {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(168, 216, 234, 0.1);
}

.note-editor-toolbar {
  display: flex;
  gap: 4px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(255, 255, 255, 0.02);
}

.toolbar-btn {
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13px;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 4px;
}

.toolbar-btn:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.toolbar-btn:active,
.toolbar-btn.active {
  background: rgba(168, 216, 234, 0.1);
  border-color: rgba(168, 216, 234, 0.3);
  color: var(--accent-1);
}

.note-editor {
  min-height: 100px;
  max-height: 200px;
  overflow-y: auto;
  padding: 12px 14px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  outline: none;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.note-editor:empty::before {
  content: attr(data-placeholder);
  color: var(--text-muted);
  pointer-events: none;
}

.note-editor ul {
  margin: 4px 0;
  padding-left: 20px;
}

.note-editor li {
  margin: 2px 0;
}

.note-editor b, .note-editor strong {
  color: var(--accent-1);
  font-weight: 700;
}

/* ---------- History Note Display ---------- */
.history-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  margin-bottom: 6px;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.history-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.history-item:hover {
  background: var(--bg-glass-hover);
}

.history-item.has-note {
  cursor: pointer;
}

.history-note-toggle-icon {
  font-size: 8px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  margin-left: auto;
  margin-right: 6px;
  opacity: 0.6;
}

.history-item.expanded .history-note-toggle-icon {
  transform: rotate(90deg);
  color: var(--accent-1);
  opacity: 1;
}

.history-note {
  font-size: 13px;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.02);
  border-radius: var(--radius-sm);
  line-height: 1.6;
  
  /* Collapsed state */
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  padding: 0 12px;
  margin-top: 0;
  border-left: 0 solid transparent;
  transition: max-height 0.25s ease-out, opacity 0.2s ease-out, padding 0.25s ease-out, margin 0.25s ease-out, border 0.25s ease-out;
}

.history-item.expanded .history-note {
  /* Expanded state */
  max-height: 350px;
  opacity: 1;
  padding: 8px 12px;
  margin-top: 8px;
  border-left: 2px solid var(--border-hover);
}

.history-note ul {
  margin: 2px 0;
  padding-left: 18px;
}

.history-note li {
  margin: 1px 0;
}

.history-note p {
  margin: 2px 0;
}

.history-note strong {
  color: var(--accent-1);
}

/* ---------- History (overrides for new layout) ---------- */

.history-item.positive {
  border-left: 3px solid var(--accent-positive);
}

.history-item.warning {
  border-left: 3px solid var(--accent-warning);
}

.history-item.negative {
  border-left: 3px solid var(--accent-negative);
}

.history-emoji {
  font-size: 20px;
}

.history-info {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.history-habit {
  font-size: 14px;
  font-weight: 500;
}

.history-action {
  font-size: 12px;
  color: var(--text-muted);
}

.history-points {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
}

.history-points.positive {
  color: var(--accent-positive);
}

.history-points.negative {
  color: var(--accent-negative);
}

.history-time {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ---------- Weekly Chart ---------- */
.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-top: 16px;
}

.chart-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

#weekly-chart {
  display: block;
  width: 100%;
}

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center;
  padding: 30px 20px;
  color: var(--text-muted);
  font-size: 14px;
}

/* ---------- Fly Score Animation ---------- */
.fly-score {
  position: absolute;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  pointer-events: none;
  z-index: 50;
  opacity: 0;
  transform: translateY(0);
  text-shadow: 0 0 20px currentColor;
}

.fly-score.animate {
  animation: flyUp 1.2s ease-out forwards;
}

@keyframes flyUp {
  0% {
    opacity: 0;
    transform: translateY(0) scale(0.5);
  }
  20% {
    opacity: 1;
    transform: translateY(-20px) scale(1.2);
  }
  100% {
    opacity: 0;
    transform: translateY(-80px) scale(0.8);
  }
}

/* ---------- Shake Animation ---------- */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10% { transform: translateX(-6px); }
  30% { transform: translateX(5px); }
  50% { transform: translateX(-4px); }
  70% { transform: translateX(3px); }
  90% { transform: translateX(-1px); }
}

/* ---------- Toast ---------- */
#toast-container {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
  width: calc(100% - 40px);
  max-width: 400px;
}

.toast {
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  pointer-events: auto;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.toast-success {
  background: rgba(52, 211, 153, 0.15);
  border: 1px solid rgba(52, 211, 153, 0.3);
  color: var(--accent-positive);
}

.toast-warning {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--accent-warning);
}

.toast-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--accent-negative);
}

.toast-info {
  background: rgba(168, 216, 234, 0.15);
  border: 1px solid rgba(168, 216, 234, 0.3);
  color: var(--accent-1);
}

/* ---------- Celebration Overlay ---------- */
.celebration-overlay {
  position: fixed;
  inset: 0;
  z-index: 250;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.celebration-overlay.show {
  opacity: 1;
}

.celebration-content {
  text-align: center;
  animation: celebrationIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.celebration-emoji {
  font-size: 80px;
  animation: celebrationBounce 0.8s ease infinite alternate;
}

.celebration-text {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  color: var(--accent-1);
  margin-top: 12px;
  letter-spacing: 4px;
}

.celebration-stage {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-top: 8px;
}

@keyframes celebrationIn {
  from {
    opacity: 0;
    transform: scale(0.3) rotate(-10deg);
  }
  to {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

@keyframes celebrationBounce {
  from { transform: translateY(0); }
  to { transform: translateY(-10px); }
}

/* ---------- Responsive ---------- */
@media (max-width: 380px) {
  #total-score {
    font-size: 44px;
  }

  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .habit-actions {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }

  .action-btn {
    padding: 10px 4px;
    font-size: 12px;
  }
}

@media (min-width: 481px) {
  .app-container {
    max-width: 520px;
  }
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: var(--radius-full);
}

/* ---------- Selection ---------- */
::selection {
  background: rgba(168, 216, 234, 0.3);
  color: var(--text-primary);
}