/* ==============================================
   CSS Variables & Theme
   ============================================== */
:root {
  /* Colors - Dark theme inspired by terminal/code editors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a26;
  --bg-hover: #22222e;
  
  --text-primary: #e4e4eb;
  --text-secondary: #9494a8;
  --text-muted: #5c5c70;
  
  --accent-primary: #6366f1;
  --accent-secondary: #818cf8;
  --accent-warning: #f59e0b;
  --accent-glow: rgba(99, 102, 241, 0.3);
  
  --success: #22c55e;
  --warning: #eab308;
  --error: #ef4444;
  
  --border-color: #2a2a3a;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  
  /* Typography */
  --font-sans: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* ==============================================
   Reset & Base
   ============================================== */
*, *::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-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
}

a {
  color: var(--accent-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-primary);
}

/* ==============================================
   Layout
   ============================================== */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  max-width: 600px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

.header {
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: var(--spacing-xs);
}

.main {
  flex: 1;
  position: relative;
}

.footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.footer-info {
  margin-bottom: var(--spacing-xs);
}

.footer-credits {
  margin-top: var(--spacing-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.footer-credits strong {
  color: var(--accent-secondary);
  font-weight: 600;
}

/* ==============================================
   Steps
   ============================================== */
.step {
  display: none;
  animation: fadeIn 0.3s ease;
}

.step.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==============================================
   Upload Area
   ============================================== */
.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-xxl) var(--spacing-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  background: var(--bg-secondary);
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
  box-shadow: 0 0 30px var(--accent-glow);
}

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

.upload-area h2 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.upload-area p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.upload-hint {
  margin-top: var(--spacing-md);
  color: var(--text-muted) !important;
  font-size: 0.85rem !important;
}

/* How-to section */
.how-to {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}

.how-to h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.how-to ol {
  padding-left: var(--spacing-lg);
  color: var(--text-secondary);
}

.how-to li {
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

/* ==============================================
   Dates Section
   ============================================== */
.dates-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.dates-header h2 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
}

.dates-header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.dates-container {
  margin-bottom: var(--spacing-lg);
}

.dates-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.date-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.date-card:hover {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.date-card.selected {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
  box-shadow: 0 0 20px var(--accent-glow);
}

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

.date-value {
  font-weight: 600;
  font-size: 1rem;
}

.date-preview {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 2px;
}

.date-stats {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.message-count {
  font-size: 0.9rem;
  color: var(--accent-secondary);
  font-weight: 500;
}

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

#load-more-dates {
  margin-top: var(--spacing-md);
  width: 100%;
}

/* ==============================================
   Options Section
   ============================================== */
.options-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.options-header h2 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
}

.option-group {
  margin-bottom: var(--spacing-lg);
}

.option-group > label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.radio-cards {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.radio-card {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.radio-card:hover {
  border-color: var(--text-muted);
}

.radio-card.selected {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.radio-card input {
  display: none;
}

.card-content {
  display: flex;
  flex-direction: column;
}

.card-content strong {
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.card-content small {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.options-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.options-actions button {
  flex: 1;
}

/* ==============================================
   Result Section
   ============================================== */
.result-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.result-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.summary-text {
  font-size: 0.95rem;
  line-height: 1.7;
  white-space: pre-wrap;
}

.summary-text h2 {
  font-size: 1.1rem;
  color: var(--accent-secondary);
  margin: var(--spacing-md) 0 var(--spacing-sm);
}

.summary-text h2:first-child {
  margin-top: 0;
}

.summary-text p {
  margin-bottom: var(--spacing-sm);
}

.summary-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.stat-item {
  display: flex;
  flex-direction: column;
  font-size: 0.8rem;
}

.stat-value {
  font-weight: 600;
  color: var(--accent-secondary);
}

.stat-label {
  color: var(--text-muted);
}

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

.result-actions button {
  min-width: 0;
  white-space: normal;
  text-align: center;
  font-size: 0.85rem;
  padding: var(--spacing-md) var(--spacing-sm);
}

.result-actions button.btn-primary {
  grid-column: span 2;
}

@media (min-width: 480px) {
  .result-actions {
    grid-template-columns: repeat(3, 1fr);
  }
  .result-actions button.btn-primary {
    grid-column: span 3;
  }
}

/* ==============================================
   Buttons
   ============================================== */
.btn-primary,
.btn-secondary,
.btn-link {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

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

.btn-primary:hover {
  background: var(--accent-secondary);
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

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

.btn-link {
  background: transparent;
  color: var(--text-secondary);
  padding: var(--spacing-sm) 0;
}

.btn-link:hover {
  color: var(--accent-secondary);
}

/* ==============================================
   Loading
   ============================================== */
.loading {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 15, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(4px);
}

.loading:not([hidden]) {
  display: flex;
}

.loading-content {
  text-align: center;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-tertiary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

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

#loading-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Rate Limit Wait UI */
.rate-limit-wait {
  text-align: center;
  padding: var(--spacing-md);
}

.rate-limit-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

.rate-limit-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-warning);
  margin-bottom: var(--spacing-xs);
}

.rate-limit-msg {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.rate-limit-progress {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.rate-limit-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Rate Limit Banner (persistent at top of page) */
.rate-limit-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 10000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  animation: slideDown 0.3s ease-out;
}

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

.rate-limit-banner[hidden] {
  display: none;
}

.rate-limit-banner-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  max-width: 600px;
  margin: 0 auto;
}

.rate-limit-banner-icon {
  font-size: 1.2rem;
  animation: pulse 1.5s ease-in-out infinite;
}

.rate-limit-banner-text {
  font-size: 0.9rem;
}

.rate-limit-banner-text strong {
  font-weight: 600;
}

.rate-limit-banner-text .countdown {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  background: rgba(255, 255, 255, 0.2);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.countdown-inline {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-weight: 600;
  color: var(--accent-warning);
}

/* ==============================================
   Toast
   ============================================== */
.toast {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  z-index: 200;
  animation: slideUp 0.3s ease;
}

.toast.error {
  border-color: var(--error);
  background: rgba(239, 68, 68, 0.1);
}

.toast.success {
  border-color: var(--success);
  background: rgba(34, 197, 94, 0.1);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ==============================================
   Responsive
   ============================================== */
@media (min-width: 640px) {
  .radio-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
  
  #privacy-options {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ==============================================
   Token Bar
   ============================================== */
.token-bar {
  position: relative;
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
}

.token-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  border-radius: var(--border-radius-sm);
  transition: width 0.3s ease, background 0.3s ease;
  opacity: 0.2;
}

.token-fill.good { background: var(--success); }
.token-fill.warning { background: var(--warning); }
.token-fill.critical { background: var(--error); }

.token-text {
  position: relative;
  font-size: 0.8rem;
  color: var(--text-secondary);
  z-index: 1;
}

/* ==============================================
   Mode Selection Modal
   ============================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 15, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: var(--spacing-md);
  backdrop-filter: blur(8px);
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  max-width: 600px;
  width: 100%;
  animation: modalIn 0.3s ease;
}

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

.modal-content h2 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
  text-align: center;
}

.modal-subtitle {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.mode-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

@media (max-width: 500px) {
  .mode-options {
    grid-template-columns: 1fr;
  }
}

.mode-card {
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.mode-card:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.mode-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.mode-card h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-xs);
}

.mode-card > p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.mode-card ul {
  list-style: none;
  text-align: left;
  font-size: 0.85rem;
  margin-bottom: var(--spacing-md);
}

.mode-card li {
  padding: var(--spacing-xs) 0;
  color: var(--text-secondary);
}

.mode-time {
  font-weight: 600;
  color: var(--accent-secondary);
  font-size: 0.95rem;
}

.modal-cancel {
  display: block;
  margin: 0 auto;
}

/* ==============================================
   Progress Bar (for full mode)
   ============================================== */
.progress-container {
  width: 100%;
  max-width: 300px;
}

.progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
}

.progress-fill {
  height: 100%;
  background: var(--accent-primary);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
}

/* ==============================================
   Large message count indicator
   ============================================== */
.message-count.large {
  color: var(--warning);
}

/* ==============================================
   PWA Install Banner (optional)
   ============================================== */
.install-prompt {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  z-index: 50;
}

.install-prompt p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.install-prompt button {
  white-space: nowrap;
}

/* ==============================================
   Action Choice (Day vs Group Analysis)
   ============================================== */
.action-choice {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.action-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-card:hover {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.action-card.selected {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
  box-shadow: 0 0 20px var(--accent-glow);
}

.action-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}

.action-card strong {
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
}

.action-card small {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.section-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

@media (max-width: 400px) {
  .action-choice {
    grid-template-columns: 1fr;
  }
}

/* ==============================================
   Group Analysis - Header
   ============================================== */
.analysis-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.analysis-header h2 {
  font-size: 1.4rem;
  margin-bottom: var(--spacing-xs);
}

.analysis-header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ==============================================
   Time Slider
   ============================================== */
.time-slider-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
}

.time-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  outline: none;
  margin-bottom: var(--spacing-md);
}

.time-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-glow);
  transition: transform var(--transition-fast);
}

.time-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.time-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.time-label {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-secondary);
}

.msgs-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ==============================================
   Mode Comparison (Complete vs Sampling)
   ============================================== */
.mode-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

@media (max-width: 500px) {
  .mode-comparison {
    grid-template-columns: 1fr;
  }
}

.mode-option {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-lg);
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mode-option:hover {
  border-color: var(--text-muted);
}

.mode-option.selected {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.mode-option input {
  display: none;
}

.mode-visual {
  height: 24px;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
}

.mode-bar {
  height: 12px;
  width: 100%;
  border-radius: 6px;
  position: relative;
}

.mode-bar.complete {
  background: linear-gradient(90deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
}

.mode-bar.sampling {
  background: repeating-linear-gradient(
    90deg,
    var(--accent-primary) 0px,
    var(--accent-primary) 15px,
    transparent 15px,
    transparent 25px
  );
}

.mode-option strong {
  font-size: 1rem;
  margin-bottom: var(--spacing-sm);
}

.mode-pros, .mode-cons {
  list-style: none;
  font-size: 0.8rem;
  margin-bottom: var(--spacing-xs);
}

.mode-pros li {
  color: var(--success);
}

.mode-cons li {
  color: var(--text-muted);
}

.mode-estimate {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-secondary);
}

/* ==============================================
   Days Limit Bar
   ============================================== */
.days-limit-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-md);
}

.limit-progress {
  flex: 1;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.limit-fill {
  height: 100%;
  background: var(--accent-primary);
  border-radius: 4px;
  transition: width 0.3s ease, background 0.3s ease;
}

.limit-fill.warning {
  background: var(--warning);
}

.limit-fill.full {
  background: var(--error);
}

#limit-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

/* ==============================================
   Days Checklist
   ============================================== */
.days-checklist {
  max-height: 300px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.day-check-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.day-check-item:hover:not(.disabled) {
  border-color: var(--accent-primary);
}

.day-check-item.selected {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.day-check-item.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

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

.day-check-date {
  font-size: 0.9rem;
  font-weight: 500;
}

.day-check-msgs {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.day-check-bar {
  width: 80px;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.day-check-bar-fill {
  height: 100%;
  background: var(--accent-secondary);
  border-radius: 3px;
}

/* ==============================================
   Style Cards
   ============================================== */
.style-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
}

@media (max-width: 500px) {
  .style-cards {
    grid-template-columns: 1fr;
  }
}

.style-cards .radio-card {
  flex-direction: column;
  text-align: center;
  padding: var(--spacing-md);
}

.style-cards .card-content {
  align-items: center;
}

/* ==============================================
   Group Analysis Result
   ============================================== */
.group-stats {
  margin-top: var(--spacing-xl);
  display: grid;
  gap: var(--spacing-lg);
}

.stat-section {
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-sm);
}

.stat-section h3 {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

/* Top Talkers */
.top-talkers {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

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

.talker-rank {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
}

.talker-rank.gold { color: #ffd700; }
.talker-rank.silver { color: #c0c0c0; }
.talker-rank.bronze { color: #cd7f32; }

.talker-name {
  flex: 1;
  font-size: 0.85rem;
}

.talker-bar {
  width: 100px;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.talker-bar-fill {
  height: 100%;
  background: var(--accent-primary);
  border-radius: 4px;
}

.talker-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  width: 50px;
  text-align: right;
}

/* Activity Chart */
.activity-chart {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 60px;
}

.activity-bar {
  flex: 1;
  background: var(--accent-primary);
  border-radius: 2px 2px 0 0;
  min-height: 4px;
  transition: height 0.3s ease;
}

.activity-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: var(--spacing-xs);
}

/* Top Emojis */
.top-emojis {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.emoji-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--border-radius-sm);
}

.emoji-char {
  font-size: 1.2rem;
}

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

/* Vibe Score */
.vibe-section {
  text-align: center;
}

.vibe-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
}

.vibe-number {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.vibe-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.vibe-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
}

.vibe-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--error), var(--warning), var(--success));
  border-radius: 4px;
}

/* ==============================================
   Audio Result
   ============================================== */

.transcription-details {
  margin-top: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.transcription-details summary {
  padding: var(--spacing-md);
  cursor: pointer;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 500;
  user-select: none;
  transition: background var(--transition-fast);
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.transcription-details summary::-webkit-details-marker {
  display: none;
}

.transcription-details summary::after {
  content: '▸';
  margin-left: auto;
  transition: transform var(--transition-fast);
}

.transcription-details[open] summary::after {
  transform: rotate(90deg);
}

.transcription-details summary:hover {
  background: var(--bg-hover);
}

.transcription-details[open] summary {
  border-bottom: 1px solid var(--border-color);
}

.transcription-text {
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 400px;
  overflow-y: auto;
}

.transcription-text::-webkit-scrollbar {
  width: 6px;
}

.transcription-text::-webkit-scrollbar-track {
  background: transparent;
}

.transcription-text::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

/* ==============================================
   Audio Choice Step
   ============================================== */
.audio-choice-hint {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-lg);
}

/* ==============================================
   Audio Chat
   ============================================== */
.chat-header {
  margin-bottom: var(--spacing-lg);
  position: relative;
}

.btn-back-inline {
  position: absolute;
  left: 0;
  top: 0;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: var(--spacing-xs);
  margin: calc(-1 * var(--spacing-xs)) 0 0 calc(-1 * var(--spacing-xs));
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast);
}

.btn-back-inline:hover {
  color: var(--accent-secondary);
}

.chat-header h2 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
  padding-left: 2rem;
}

.chat-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding-left: 2rem;
}

.chat-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.chat-messages {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  max-height: 50vh;
  min-height: 200px;
  overflow-y: auto;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

.chat-message {
  display: flex;
  flex-direction: column;
  max-width: 90%;
  animation: chatMessageIn 0.25s ease;
}

@keyframes chatMessageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.chat-message.user { align-self: flex-end; }
.chat-message.assistant { align-self: flex-start; }

.chat-message-bubble {
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: 0.95rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.chat-message.user .chat-message-bubble {
  background: var(--accent-primary);
  color: white;
  border-bottom-right-radius: 4px;
}

.chat-message.assistant .chat-message-bubble {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 4px;
}

.chat-message-bubble h2,
.chat-message-bubble strong {
  color: inherit;
}

.chat-message-actions {
  display: flex;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xs);
  opacity: 0.7;
}

.chat-message-actions button {
  background: transparent;
  border: none;
  color: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background var(--transition-fast);
}

.chat-message.user .chat-message-actions button:hover {
  background: rgba(255, 255, 255, 0.2);
}

.chat-message.assistant .chat-message-actions button:hover {
  background: var(--bg-hover);
}

.chat-typing {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  width: fit-content;
}

.chat-typing[hidden] {
  display: none;
}

.chat-typing-indicator {
  display: flex;
  gap: 4px;
  align-items: center;
}

.chat-typing-indicator span {
  width: 6px;
  height: 6px;
  background: var(--accent-primary);
  border-radius: 50%;
  animation: typingBounce 1.4s ease-in-out infinite;
}

.chat-typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-4px); }
}

.typing-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.chat-input-area {
  display: flex;
  gap: var(--spacing-sm);
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  padding: var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  resize: none;
  min-height: 48px;
  max-height: 120px;
  transition: border-color var(--transition-fast);
}

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

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

.btn-send-chat {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
  white-space: nowrap;
}

.btn-send-chat:hover:not(:disabled) {
  background: var(--accent-secondary);
}

.btn-send-chat:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.chat-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}