/* css/app.css — Custom styles for Mood Tracker (Stage 7: Polish, PWA, Final Integration) */

@keyframes slideUp {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Noto Sans KR font import */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700&display=swap');

/* CSS Custom Properties */
:root {
  /* Color Palette */
  --color-primary: #6366F1;
  --color-primary-light: #818CF8;
  --color-primary-dark: #4F46E5;
  --color-secondary: #F59E0B;
  --color-secondary-light: #FCD34D;
  --color-secondary-dark: #D97706;
  --color-bg: #FFF7ED;
  --color-surface: #FFFFFF;
  --color-text: #1F2937;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-border: #FED7AA;
  --color-border-light: #FFEDD5;
  --color-danger: #EF4444;
  --color-danger-light: #FCA5A5;
  --color-success: #10B981;
  --color-success-light: #6EE7B7;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08);

  /* Animation */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-spring: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Safe area */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

/* ─── Base Reset & Typography ─── */
*, *::before, *::after {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overscroll-behavior: none;
}

/* ─── Safe Area Insets ─── */
.safe-area-inset {
  padding-top: var(--safe-top);
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
}

#bottom-nav {
  padding-bottom: var(--safe-bottom);
}

/* ─── Focus Styles (Accessibility) ─── */
:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

/* ─── Card Component ─── */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border-light);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

/* ─── Buttons ─── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 12px 24px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: scale(0.95);
  background: var(--color-primary-dark);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 12px 24px;
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.btn-secondary:active {
  transform: scale(0.95);
  background: rgba(99, 102, 241, 0.05);
}

.btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 12px 24px;
  background: var(--color-danger);
  color: white;
  border: none;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.btn-danger:active {
  transform: scale(0.95);
  background: #DC2626;
}

.btn-text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 8px 16px;
  background: none;
  color: var(--color-primary);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast);
  touch-action: manipulation;
}

.btn-text:active {
  background: rgba(99, 102, 241, 0.08);
}

/* ─── Install Banner ─── */
.install-banner {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-primary);
  color: white;
  padding: 8px 16px;
  transform: translateY(-100%);
  transition: transform var(--transition-normal);
}

.install-banner--visible {
  transform: translateY(0);
}

.install-banner-content {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 448px;
  margin: 0 auto;
}

.install-banner-icon {
  font-size: 20px;
  flex-shrink: 0;
}

.install-banner-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.install-banner-text strong {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.install-banner-text span {
  font-size: 12px;
  opacity: 0.8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.install-banner-btn {
  flex-shrink: 0;
  min-height: 36px;
  padding: 6px 16px;
  background: white;
  color: var(--color-primary);
  border: none;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

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

.install-banner-close {
  flex-shrink: 0;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: white;
  font-size: 16px;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
  touch-action: manipulation;
}

.install-banner-close:active {
  opacity: 1;
}

/* ─── Page Transitions ─── */
.view-content {
  will-change: transform, opacity;
}

/* View enters from right (forward navigation) */
.view-enter-right {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  opacity: 0;
  transform: translateX(30%);
  transition: transform var(--transition-normal) ease-out, opacity var(--transition-normal) ease-out;
}
.view-enter-right--active {
  opacity: 1;
  transform: translateX(0);
  position: relative;
}

/* View enters from left (backward navigation) */
.view-enter-left {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  opacity: 0;
  transform: translateX(-30%);
  transition: transform var(--transition-normal) ease-out, opacity var(--transition-normal) ease-out;
}
.view-enter-left--active {
  opacity: 1;
  transform: translateX(0);
  position: relative;
}

/* Simple enter (no direction) */
.view-enter {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}
.view-enter--active {
  opacity: 1;
  transform: translateY(0);
}

/* View exits to left */
.view-exit-left {
  transition: transform var(--transition-normal) ease-in, opacity var(--transition-normal) ease-in;
}
.view-exit-left--active {
  opacity: 0;
  transform: translateX(-30%);
}

/* View exits to right */
.view-exit-right {
  transition: transform var(--transition-normal) ease-in, opacity var(--transition-normal) ease-in;
}
.view-exit-right--active {
  opacity: 0;
  transform: translateX(30%);
}

/* ─── Skeleton Loading ─── */
.skeleton {
  background: linear-gradient(90deg, #F3F4F6 25%, #E5E7EB 50%, #F3F4F6 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--color-border-light);
}

.skeleton-line {
  height: 14px;
  margin-bottom: var(--space-sm);
  border-radius: 4px;
}

.skeleton-line--title {
  height: 20px;
  width: 40%;
  margin-bottom: var(--space-md);
}

.skeleton-line--short {
  width: 60%;
}

.skeleton-line--medium {
  width: 80%;
}

.skeleton-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  margin: 0 auto var(--space-md);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ─── Empty States ─── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  min-height: 280px;
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--space-lg);
  opacity: 0.8;
}

.empty-state-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.empty-state-subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  line-height: 1.5;
}

.empty-state-action {
  margin-top: var(--space-sm);
}

/* ─── Error State ─── */
.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  min-height: 280px;
}

.error-state-icon {
  font-size: 48px;
  margin-bottom: var(--space-lg);
}

.error-state-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-danger);
  margin-bottom: var(--space-sm);
}

.error-state-subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

/* ─── Toast / Inline Error ─── */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1F2937;
  color: white;
  padding: 12px 20px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  z-index: 100;
  opacity: 0;
  transition: all var(--transition-normal);
  pointer-events: none;
  max-width: 320px;
  text-align: center;
}

.toast--visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

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

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

/* ─── Onboarding ─── */
.onboarding-view {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 80px);
  padding: var(--space-lg);
}

.onboarding-card {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
}

.onboarding-icon {
  font-size: 64px;
  margin-bottom: var(--space-lg);
}

.onboarding-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.onboarding-subtitle {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

.onboarding-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  text-align: left;
}

.onboarding-feature {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  font-size: 15px;
  color: var(--color-text);
}

.onboarding-feature-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.onboarding-start {
  width: 100%;
  max-width: 280px;
}

/* ─── Navigation ─── */
#bottom-nav {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 6px 0;
  padding-bottom: calc(6px + var(--safe-bottom));
  background: var(--color-surface);
  border-top: 1px solid var(--color-border-light);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 4px 12px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 500;
  transition: color var(--transition-fast), transform var(--transition-fast);
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.nav-item:active {
  transform: scale(0.9);
}

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

.nav-item--active .nav-icon {
  transform: scale(1.1);
}

.nav-icon {
  font-size: 22px;
  margin-bottom: 2px;
  transition: transform var(--transition-spring);
}

.nav-fab {
  position: absolute;
  bottom: calc(16px + var(--safe-bottom));
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: transform var(--transition-spring), box-shadow var(--transition-fast);
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
  z-index: 51;
}

.nav-fab:active {
  transform: translateX(-50%) scale(0.9);
}

.nav-fab:hover {
  box-shadow: 0 12px 20px -4px rgba(99, 102, 241, 0.35);
}

/* ─── Home View ─── */
.home-view {
  padding: var(--space-md) var(--space-md) var(--space-lg);
}

.home-view .card {
  margin-bottom: var(--space-md);
}

.home-greeting {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

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

.today-mood-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.today-mood-card:active {
  background: rgba(99, 102, 241, 0.03);
}

/* ─── Streak ─── */
.streak-card {
  text-align: center;
  padding: var(--space-lg);
}

.streak-flame {
  font-size: 36px;
  margin-bottom: var(--space-sm);
  animation: streak-pulse 2s ease-in-out infinite;
}

.streak-flame--empty {
  animation: none;
}

@keyframes streak-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.streak-count {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.streak-count--empty {
  color: var(--color-text-muted);
}

.streak-label {
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ─── Mood Chart ─── */
.mood-chart-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ─── Rhythm Timeline ─── */
.rhythm-timeline-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: var(--space-sm);
}

/* ─── SRM Score ─── */
.srm-score-card {
  text-align: center;
  padding: var(--space-lg);
}

.srm-score-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.srm-gauge {
  margin: 0 auto var(--space-md);
}

.srm-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
}

/* ─── Log View ─── */
.log-view {
  padding: var(--space-md);
}

.log-date-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.log-date-nav button {
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 16px;
  cursor: pointer;
  color: var(--color-primary);
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.log-date-nav button:active {
  transform: scale(0.9);
  background: rgba(99, 102, 241, 0.05);
}

.log-section {
  margin-bottom: var(--space-lg);
}

.log-section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

/* Mood slider */
.mood-slider-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md) 0;
}

.mood-display {
  font-size: 40px;
  margin-bottom: var(--space-sm);
  transition: transform var(--transition-spring);
}

.mood-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-md);
  transition: color var(--transition-fast);
}

.mood-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(to right, #3B82F6, #F59E0B, #10B981);
  outline: none;
  transition: height var(--transition-fast);
  touch-action: manipulation;
}

.mood-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: white;
  border: 3px solid var(--color-primary);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-spring), border-color var(--transition-fast);
}

.mood-slider::-webkit-slider-thumb:active {
  transform: scale(1.2);
  border-color: var(--color-primary-dark);
}

.mood-slider::-moz-range-thumb {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: white;
  border: 3px solid var(--color-primary);
  cursor: pointer;
  box-shadow: var(--shadow-md);
}

/* Energy slider */
.energy-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(to right, #EF4444, #F59E0B, #10B981);
  outline: none;
  touch-action: manipulation;
}

.energy-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: white;
  border: 3px solid var(--color-secondary);
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-spring);
}

.energy-slider::-webkit-slider-thumb:active {
  transform: scale(1.2);
}

.energy-slider::-moz-range-thumb {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: white;
  border: 3px solid var(--color-secondary);
  cursor: pointer;
  box-shadow: var(--shadow-md);
}

/* Time picker group */
.time-picker-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.time-picker-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: var(--space-sm) 0;
}

.time-picker-item label {
  font-size: 14px;
  color: var(--color-text);
  min-width: 80px;
}

.time-picker-item input[type="time"] {
  font-family: inherit;
  font-size: 15px;
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 44px;
  min-width: 120px;
  transition: border-color var(--transition-fast);
}

.time-picker-item input[type="time"]:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Note textarea */
.log-note {
  width: 100%;
  min-height: 80px;
  padding: var(--space-md);
  font-family: inherit;
  font-size: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  resize: vertical;
  transition: border-color var(--transition-fast);
}

.log-note:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* Save button */
.log-save-btn {
  width: 100%;
  margin-top: var(--space-lg);
}

/* ─── Calendar View ─── */
.calendar-view {
  padding: var(--space-md);
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.calendar-header h2 {
  font-size: 18px;
  font-weight: 700;
}

.calendar-nav-btn {
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 16px;
  cursor: pointer;
  color: var(--color-primary);
  transition: all var(--transition-fast);
  touch-action: manipulation;
}

.calendar-nav-btn:active {
  transform: scale(0.9);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-bottom: var(--space-lg);
}

.calendar-day-header {
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
  padding: var(--space-sm) 0;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
  touch-action: manipulation;
  position: relative;
}

.calendar-day:active {
  transform: scale(0.9);
}

.calendar-day--empty {
  cursor: default;
}

.calendar-day--today {
  box-shadow: inset 0 0 0 2px var(--color-primary);
  font-weight: 700;
}

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

.calendar-day--has-mood {
  font-weight: 600;
}

/* Calendar day popup */
.calendar-popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 70;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: fade-in var(--transition-fast);
}

.calendar-popup {
  background: var(--color-surface);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: var(--space-xl) var(--space-lg) calc(var(--space-xl) + var(--safe-bottom));
  width: 100%;
  max-width: 448px;
  animation: slide-up var(--transition-normal);
}

@keyframes slide-up {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ─── Stats View ─── */
.stats-view {
  padding: var(--space-md);
}

.stats-header {
  margin-bottom: var(--space-lg);
}

.stats-title {
  font-size: 20px;
  font-weight: 700;
}

.stats-tab-bar {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.stats-tab {
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  background: var(--color-surface);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  touch-action: manipulation;
}

.stats-tab:active {
  transform: scale(0.95);
}

.stats-tab--active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.stats-card {
  margin-bottom: var(--space-md);
}

.stats-card-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.stats-bar-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.stats-bar-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.stats-bar-label {
  font-size: 13px;
  color: var(--color-text);
  min-width: 60px;
}

.stats-bar-track {
  flex: 1;
  height: 8px;
  background: var(--color-bg);
  border-radius: 4px;
  overflow: hidden;
}

.stats-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width var(--transition-slow);
}

.stats-bar-value {
  font-size: 12px;
  color: var(--color-text-muted);
  min-width: 40px;
  text-align: right;
}

/* ─── Settings View ─── */
.settings-view {
  padding: var(--space-md);
}

.settings-header {
  margin-bottom: var(--space-lg);
}

.settings-title {
  font-size: 20px;
  font-weight: 700;
}

.settings-card {
  margin-bottom: var(--space-md);
}

.settings-card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.settings-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: var(--space-sm) 0;
}

.settings-item-label {
  font-size: 15px;
  color: var(--color-text);
}

.settings-item-value {
  font-size: 14px;
  color: var(--color-text-secondary);
}

/* Language toggle */
.lang-toggle {
  display: flex;
  gap: var(--space-xs);
  background: var(--color-bg);
  border-radius: var(--radius-full);
  padding: 3px;
}

.lang-toggle-btn {
  min-height: 36px;
  padding: 6px 16px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: transparent;
  color: var(--color-text-secondary);
  touch-action: manipulation;
}

.lang-toggle-btn--active {
  background: var(--color-surface);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

/* Data action buttons */
.settings-data-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.settings-data-btn {
  width: 100%;
}

/* ─── Micro-interactions ─── */
/* Ripple effect for buttons */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  opacity: 0;
  transform: scale(0);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  pointer-events: none;
}

.ripple:active::after {
  opacity: 1;
  transform: scale(2);
}

/* Haptic-like press feedback */
.press-feedback {
  transition: transform var(--transition-fast);
}

.press-feedback:active {
  transform: scale(0.96);
}

/* ─── Toast System ─── */
#toast-container {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  pointer-events: none;
}

/* ─── Responsive: iPhone SE (375px) ─── */
@media (max-width: 374px) {
  .home-view,
  .log-view,
  .calendar-view,
  .stats-view,
  .settings-view {
    padding: var(--space-sm);
  }

  .card {
    padding: var(--space-md);
  }

  .onboarding-card {
    padding: var(--space-xl) var(--space-md);
  }

  .onboarding-icon {
    font-size: 48px;
  }

  .streak-count {
    font-size: 26px;
  }

  .mood-display {
    font-size: 32px;
  }

  .calendar-day {
    font-size: 12px;
    min-height: 38px;
  }

  .stats-tab {
    padding: 6px 12px;
    font-size: 12px;
  }
}

/* ─── Responsive: iPhone 15 (390px) ─── */
@media (min-width: 375px) and (max-width: 409px) {
  .calendar-day {
    font-size: 13px;
  }
}

/* ─── Responsive: iPhone 15 Pro Max (430px) ─── */
@media (min-width: 410px) and (max-width: 448px) {
  .calendar-day {
    font-size: 14px;
  }
}

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

  .streak-flame {
    animation: none;
  }

  .view-enter-right,
  .view-enter-left,
  .view-enter,
  .view-exit-left,
  .view-exit-right {
    transition: none;
  }
}

/* ─── Dark mode (future-ready) ─── */
@media (prefers-color-scheme: dark) {
  /* Placeholder for future dark mode support */
}

/* ─── Print ─── */
@media print {
  #bottom-nav,
  .nav-fab,
  .install-banner {
    display: none !important;
  }
}

/* ─── Misc Utilities ─── */
.text-center { text-align: center; }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ===== Stage 7: PWA, Transitions, Polish ===== */

/* Install Banner */
.install-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: linear-gradient(135deg, #6366F1, #4F46E5);
  color: white;
  padding: 12px 16px;
  transform: translateY(-100%);
  transition: transform 0.3s ease;
}
.install-banner--visible { transform: translateY(0); }
.install-banner-content {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 430px;
  margin: 0 auto;
}
.install-banner-icon { font-size: 1.5rem; }
.install-banner-text { flex: 1; }
.install-banner-text strong { display: block; font-size: 0.9rem; }
.install-banner-text span { font-size: 0.75rem; opacity: 0.9; }
.install-banner-btn {
  background: white; color: #6366F1; border: none; border-radius: 8px;
  padding: 8px 16px; font-weight: 600; font-size: 0.85rem; cursor: pointer;
}
.install-banner-close {
  background: none; border: none; color: white; font-size: 1.2rem; cursor: pointer; padding: 4px;
}

/* Page Transitions */
.view-exit-left, .view-exit-right,
.view-enter-left, .view-enter-right {
  position: relative;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.view-exit-left--active { transform: translateX(-30%); opacity: 0; }
.view-exit-right--active { transform: translateX(30%); opacity: 0; }
.view-enter-left { transform: translateX(-30%); opacity: 0; }
.view-enter-right { transform: translateX(30%); opacity: 0; }
.view-enter-left--active, .view-enter-right--active { transform: translateX(0); opacity: 1; }

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: 8px;
}
@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.skeleton-text { height: 14px; margin-bottom: 8px; width: 80%; }
.skeleton-text--short { width: 50%; }
.skeleton-card { height: 80px; margin-bottom: 16px; }

/* Empty States */
.empty-state {
  text-align: center;
  padding: 48px 24px;
}
.empty-state-icon { font-size: 3rem; margin-bottom: 16px; }
.empty-state-title { font-size: 1.1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }
.empty-state-desc { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.5; }
.empty-state-action {
  display: inline-block;
  background: linear-gradient(135deg, #6366F1, #4F46E5);
  color: white; border: none; border-radius: 12px;
  padding: 12px 28px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; text-decoration: none;
  min-height: 44px; min-width: 44px;
}
.empty-state-action:hover { opacity: 0.9; }

/* Micro-interactions */
.btn-primary:active, .btn-secondary:active {
  transform: scale(0.96);
  transition: transform 0.1s ease;
}
input[type="range"]:active::-webkit-slider-thumb {
  transform: scale(1.2);
}
input[type="time"]:focus {
  outline: 2px solid #6366F1;
  outline-offset: 2px;
}

/* Touch targets — ensure ≥44px */
button, [role="button"], a, input[type="checkbox"],
input[type="radio"], input[type="time"], select {
  min-height: 44px;
  min-width: 44px;
}

/* Toast */
.toast {
  position: fixed; bottom: 80px; left: 50%; transform: translateX(-50%);
  background: #1F2937; color: white; padding: 12px 24px;
  border-radius: 12px; font-size: 0.85rem; z-index: 9999;
  animation: toast-in 0.3s ease, toast-out 0.3s ease 2.7s;
  animation-fill-mode: forwards;
}
@keyframes toast-in { from { opacity: 0; transform: translateX(-50%) translateY(20px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }
@keyframes toast-out { from { opacity: 1; } to { opacity: 0; } }

/* Quota error */
.quota-error {
  background: #FEF2F2; border: 1px solid #FCA5A5; border-radius: 12px;
  padding: 16px; margin: 16px 0; text-align: center;
}
.quota-error-title { color: #DC2626; font-weight: 600; margin-bottom: 4px; }
.quota-error-desc { color: #991B1B; font-size: 0.85rem; }

/* ===== Offline Toast ===== */
.offline-toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #374151;
  color: white;
  padding: 10px 20px;
  border-radius: var(--radius-full, 9999px);
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 100;
  animation: slideUp 0.3s ease-out;
}

.offline-toast-icon {
  font-size: 18px;
}

/* ===== Storage Warning ===== */
.storage-warning {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #F59E0B;
  color: #1F2937;
  padding: 10px 20px;
  border-radius: var(--radius-full, 9999px);
  font-size: 13px;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: slideUp 0.3s ease-out;
}

/* ===== View Header ===== */
.view-header {
  padding: 12px 0 4px;
  margin-bottom: 4px;
}

.view-header h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text, #1F2937);
}

/* ===== Error Toast ===== */
.error-toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #DC2626;
  color: white;
  padding: 12px 20px;
  border-radius: var(--radius-full, 9999px);
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: slideUp 0.3s ease-out;
}

.error-toast-icon {
  font-size: 18px;
}
/* Language Toggle Button */
.lang-toggle-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 20px;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #6366F1;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  min-height: 36px;
}
.lang-toggle-btn:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: rgba(99, 102, 241, 0.4);
}
.lang-toggle-btn:active {
  transform: scale(0.95);
}

/* ===== Login View ===== */
.login-view {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 40px);
  padding: var(--space-lg);
}

.login-card {
  text-align: center;
  max-width: 380px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.login-icon {
  font-size: 56px;
  margin-bottom: var(--space-md);
}

.login-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.login-subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.5;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.login-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  text-align: left;
}

.login-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.login-input {
  width: 100%;
  min-height: 48px;
  padding: 12px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
  font-size: 15px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  -webkit-appearance: none;
  appearance: none;
}

.login-input:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

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

.login-error {
  background: #FEF2F2;
  color: #DC2626;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  line-height: 1.4;
}

.login-submit-btn {
  width: 100%;
  min-height: 48px;
  position: relative;
}

.login-submit-btn--loading {
  opacity: 0.8;
  pointer-events: none;
}

.login-spinner {
  display: inline-block;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: login-spin 0.6s linear infinite;
  margin-right: 8px;
  vertical-align: middle;
}

@keyframes login-spin {
  to { transform: rotate(360deg); }
}

.login-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  font-size: 13px;
  color: var(--color-text-secondary);
}

.login-toggle-btn {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 8px;
  min-height: 44px;
  touch-action: manipulation;
  transition: opacity var(--transition-fast);
}

.login-toggle-btn:active {
  opacity: 0.7;
}

.login-offline-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: var(--space-lg);
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

/* Settings - Account section */
.settings-account-info {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
}

.settings-account-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}