:root {
  --color-bg: #1a1a2e;
  --color-surface: #16213e;
  --color-surface-alt: #0f3460;
  --color-primary: #e94560;
  --color-primary-hover: #ff6b81;
  --color-text: #eaeaea;
  --color-text-muted: #a0a0b0;
  --color-success: #4ecdc4;
  --color-warning: #ffe66d;
  --color-poor: #ff6b6b;
  --color-good: #95e1d3;
  --color-great: #4ecdc4;
  --color-ok: #ffe66d;
  --color-border: #2a2a4a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-width: 600px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  min-height: 100dvh;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body.modal-open {
  overflow: hidden;
}

#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9999;
}

.app {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  padding: 16px 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 1.6em;
  height: 1.6em;
}

.logo-subtitle {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.nav {
  display: flex;
  gap: 4px;
  justify-content: center;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 4px;
}

.nav-btn {
  flex: 1;
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

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

.nav-btn:hover:not(.active) {
  color: var(--color-text);
}

.nav-btn-help {
  flex: 0;
  width: 32px;
  min-width: 32px;
  padding: 8px 0;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 50%;
  margin-left: 4px;
}

/* Main */
.main {
  flex: 1;
  padding: 20px 0;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

/* Game View */
.game-header {
  text-align: center;
  margin-bottom: 20px;
}

.category-title {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.game-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.game-round-counter {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.game-running-score {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
}

.progress-dots {
  display: flex;
  gap: 8px;
  justify-content: center;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border);
  transition: all 0.3s;
}

.dot.active {
  background: var(--color-primary);
  transform: scale(1.2);
}

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

/* Photo */
.photo-container {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  aspect-ratio: 16/10;
  background: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
}

.photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.2s ease;
}

/* Guess Section */
.guess-section {
  text-align: center;
}

.question-text {
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--color-text);
}

.slider-group {
  margin-bottom: 12px;
  padding: 0 4px;
}

.guess-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--color-surface);
  outline: none;
  cursor: pointer;
  margin-bottom: 8px;
}

.guess-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 3px solid var(--color-bg);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  transition: transform 0.1s;
}

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

.guess-slider::-moz-range-thumb {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  border: 3px solid var(--color-bg);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.digit-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 16px;
}

.digit-inputs {
  display: flex;
  gap: 4px;
}

.digit-box {
  width: 36px;
  height: 48px;
  border: 2px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1.4rem;
  font-weight: 700;
  text-align: center;
  caret-color: var(--color-primary);
  transition: border-color 0.2s;
  -moz-appearance: textfield;
  padding: 0;
}

.digit-box::-webkit-outer-spin-button,
.digit-box::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.digit-box:focus {
  outline: none;
  border-color: var(--color-primary);
  background: var(--color-surface-alt);
}

.unit-label {
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

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

.btn-danger {
  background: #dc3545;
  color: #fff;
}

.btn-danger:hover {
  background: #a71d2a;
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

/* Result */
.result-section {
  text-align: center;
}

.result-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.result-score {
  margin-bottom: 16px;
}

.score-value {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-success);
  display: block;
}

.score-value.low {
  color: var(--color-poor);
}

.score-value.medium {
  color: var(--color-ok);
}

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

.result-answer {
  font-size: 1rem;
  margin-bottom: 8px;
}

.result-fun-fact {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-style: italic;
  margin-bottom: 20px;
}

/* Review Mode */
.review-mode {
  padding: 8px 0;
}

.review-header {
  text-align: center;
  margin-bottom: 16px;
}

.review-title {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.review-total-score {
  margin-bottom: 8px;
}

.review-total-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-success);
}

.review-total-label {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.review-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.review-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
}

.review-card-img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  display: block;
}

.review-card-body {
  padding: 10px;
}

.review-card-subject {
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.review-card-answer {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 2px;
}

.review-card-guess {
  font-size: 0.75rem;
  color: var(--color-primary-hover);
  margin-bottom: 4px;
}

.review-card-fact {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  font-style: italic;
  line-height: 1.3;
}

.review-card-score {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  margin-top: 6px;
}

.review-card-score.high {
  background: rgba(78, 205, 196, 0.15);
  color: var(--color-success);
}

.review-card-score.medium {
  background: rgba(255, 230, 109, 0.15);
  color: var(--color-ok);
}

.review-card-score.low {
  background: rgba(255, 107, 107, 0.15);
  color: var(--color-poor);
}

.review-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

/* Round Complete */
.round-complete {
  text-align: center;
  padding: 20px 0;
}

.round-complete h2 {
  margin-bottom: 16px;
}

.total-score {
  margin-bottom: 20px;
}

.total-value {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--color-success);
}

.total-label {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

.round-summary {
  margin-bottom: 24px;
}

.summary-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.summary-item-name {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.summary-item-score {
  font-weight: 700;
}

.round-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* No Round */
.no-round {
  text-align: center;
  padding: 40px 0;
}

.no-round h2 {
  margin-bottom: 12px;
}

.no-round p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

/* Calendar */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.calendar-month-title {
  font-size: 1.2rem;
}

.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  margin-bottom: 8px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: default;
  position: relative;
}

.calendar-day.has-round {
  cursor: pointer;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.calendar-day.has-round:hover {
  border-color: var(--color-primary);
}

.calendar-day.played {
  background: var(--color-surface-alt);
  border-color: var(--color-success);
  position: relative;
}

.calendar-day.played::after {
  content: '\2713';
  position: absolute;
  top: 2px;
  right: 4px;
  font-size: 0.55rem;
  color: var(--color-success);
}

.calendar-day.in-progress {
  background: var(--color-surface-alt);
  border-color: var(--color-warning);
  position: relative;
}

.calendar-day.in-progress::after {
  content: '\25B6';
  position: absolute;
  top: 2px;
  right: 4px;
  font-size: 0.5rem;
  color: var(--color-warning);
}

.calendar-day.cat-how_many {
  border-left: 3px solid #e94560;
}

.calendar-day.cat-how_tall {
  border-left: 3px solid #4ecdc4;
}

.calendar-day.cat-how_old {
  border-left: 3px solid #ffe66d;
}


.calendar-day.future {
  opacity: 0.3;
}

.calendar-legend {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.legend-dot {
  width: 12px;
  height: 12px;
  border-radius: 4px;
}

.legend-how_many { background: transparent; border-left: 3px solid #e94560; }
.legend-how_tall { background: transparent; border-left: 3px solid #4ecdc4; }
.legend-how_old { background: transparent; border-left: 3px solid #ffe66d; }
.legend-played { background: var(--color-surface-alt); border: 1px solid var(--color-success); }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px 16px;
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-date {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.stat-card.clickable {
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
  border: 1px solid transparent;
}

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

.stats-distribution {
  margin-bottom: 24px;
}

.stats-distribution h3 {
  margin-bottom: 12px;
  font-size: 1rem;
}

.distribution-chart {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px 16px 12px;
}

.distribution-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 120px;
}

.distribution-bar {
  flex: 1;
  background: var(--color-primary);
  border-radius: 4px 4px 0 0;
  min-height: 2px;
  position: relative;
  transition: opacity 0.2s;
}

.distribution-bar:hover {
  opacity: 0.8;
}

.distribution-bar::after {
  content: attr(data-count);
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--color-text-muted);
}

.distribution-axis {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 0.65rem;
  color: var(--color-text-muted);
}

.stats-history h3 {
  margin-bottom: 12px;
  font-size: 1rem;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.2s;
  border: 1px solid transparent;
}

.history-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

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

.history-category {
  font-size: 0.85rem;
  color: var(--color-text);
}

.history-score {
  font-weight: 700;
  font-size: 1rem;
}

/* Frequency Polygon */
.frequency-polygon {
  margin: 20px 0;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 16px 16px 8px;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.frequency-polygon.visible {
  opacity: 1;
}

.frequency-polygon-title {
  margin: 0 0 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: center;
  font-weight: 600;
}

.frequency-polygon svg {
  width: 100%;
  height: auto;
  display: block;
}


/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 12px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 0.9rem;
  z-index: 100;
  transition: opacity 0.3s;
}

.toast.hidden {
  opacity: 0;
  pointer-events: none;
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Welcome Modal */
.welcome-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fadeIn 0.3s ease-out;
}

.welcome-modal {
  background: var(--color-surface);
  border-radius: var(--radius);
  max-width: 440px;
  width: 100%;
  max-height: calc(100dvh - 40px);
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
  animation: slideUp 0.3s ease-out;
}

.welcome-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--color-border);
}

.welcome-title {
  font-size: 1.4rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 1.6rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
  line-height: 1;
}

.welcome-close:hover {
  color: var(--color-text);
  background: var(--color-surface-alt);
}

.welcome-content {
  padding: 20px 24px;
  overflow-y: auto;
}

.welcome-subtitle {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.welcome-steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.welcome-steps li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--color-text-muted);
}

.welcome-steps li strong {
  color: var(--color-text);
}

.welcome-step-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.welcome-analytics {
  padding: 12px 24px 0;
}

.analytics-toggle {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.analytics-toggle input[type="checkbox"] {
  margin-top: 2px;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.welcome-footer {
  padding: 16px 24px 20px;
  border-top: 1px solid var(--color-border);
}

.welcome-footer .btn {
  width: 100%;
  padding: 14px;
  font-size: 1.05rem;
}

.welcome-feedback {
  margin-top: 12px;
  font-size: 0.85rem !important;
  padding: 10px !important;
  opacity: 0.7;
  background: transparent !important;
  border: none !important;
}

.welcome-reset {
  margin-top: 16px;
  padding: 6px 0;
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s, color 0.2s;
  width: 100%;
  text-align: center;
}

.welcome-reset:hover {
  opacity: 1;
  color: #dc3545;
}

/* Reset Confirmation Modal */
.confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  animation: fadeIn 0.15s ease;
}

.confirm-overlay.hidden {
  display: none;
}

.confirm-dialog {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  max-width: 340px;
  width: 90%;
  text-align: center;
}

.confirm-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 8px;
}

.confirm-message {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0 0 20px;
  line-height: 1.4;
}

.confirm-actions {
  display: flex;
  gap: 10px;
}

.confirm-actions .btn {
  flex: 1;
  padding: 10px 16px;
  font-size: 0.9rem;
}

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

/* Animations */
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

.shake {
  animation: shake 0.3s ease-in-out;
}

.result-card {
  animation: slideUp 0.3s ease-out;
}

/* Mobile: touch & interaction basics */
@media (pointer: coarse) {
  * {
    -webkit-tap-highlight-color: transparent;
  }

  .btn, .nav-btn, .calendar-day.has-round, .stat-card.clickable, .history-item {
    touch-action: manipulation;
  }

  .btn:active {
    transform: scale(0.96);
  }

  .btn-primary:active {
    background: var(--color-primary-hover);
    transform: scale(0.96);
  }

  .nav-btn:active:not(.active) {
    background: var(--color-surface-alt);
  }

  .calendar-day.has-round:active {
    background: var(--color-surface-alt);
    transform: scale(0.95);
  }

  .stat-card.clickable:active {
    transform: scale(0.97);
  }

  .btn-primary:hover {
    transform: none;
  }
}

/* Mobile: safe areas for notched phones */
@supports (padding: env(safe-area-inset-top)) {
  .app {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
    padding-bottom: env(safe-area-inset-bottom);
  }

  .toast {
    bottom: calc(24px + env(safe-area-inset-bottom));
  }
}

/* Responsive: small phones */
@media (max-width: 400px) {
  .logo {
    font-size: 1.5rem;
  }

  .logo-subtitle {
    font-size: 0.75rem;
    margin-bottom: 8px;
  }

  .nav-btn {
    padding: 8px 10px;
    font-size: 0.8rem;
  }

  .category-title {
    font-size: 1.05rem;
  }

  .question-text {
    font-size: 1rem;
  }

  .digit-box {
    width: 30px;
    height: 40px;
    font-size: 1.2rem;
  }

  .score-value {
    font-size: 2.4rem;
  }

  .total-value {
    font-size: 2.8rem;
  }

  .result-card {
    padding: 16px;
  }

  .review-grid {
    grid-template-columns: 1fr;
  }

  .review-card-body {
    padding: 8px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-card {
    padding: 14px 12px;
  }

  .stat-value {
    font-size: 1.6rem;
  }

  .calendar-day {
    font-size: 0.8rem;
    border-radius: 6px;
  }

  .calendar-legend {
    gap: 8px;
    font-size: 0.7rem;
  }

  .welcome-header {
    padding: 16px 16px 12px;
  }

  .welcome-content {
    padding: 16px;
  }

  .welcome-footer {
    padding: 12px 16px 16px;
  }

  .welcome-title {
    font-size: 1.2rem;
  }

  .welcome-steps li {
    font-size: 0.85rem;
    gap: 10px;
  }

  .history-item {
    padding: 10px 12px;
  }
}

/* Responsive: medium phones (up to 480px) */
@media (max-width: 480px) {
  .digit-box {
    width: 32px;
    height: 44px;
    font-size: 1.3rem;
  }

  .guess-slider::-webkit-slider-thumb {
    width: 32px;
    height: 32px;
  }

  .guess-slider::-moz-range-thumb {
    width: 32px;
    height: 32px;
  }

  .btn {
    padding: 14px 24px;
    min-height: 48px;
  }

  .btn-icon {
    width: 44px;
    height: 44px;
    min-width: 44px;
  }

  .submit-guess, .next-photo, .share-btn, .share-btn-review,
  .play-another, .back-to-calendar, .go-calendar {
    width: 100%;
  }

  .nav-btn {
    min-height: 40px;
  }

  .calendar-day {
    min-height: 36px;
  }

  .calendar-days {
    gap: 3px;
  }

  .main {
    padding: 16px 0;
  }
}

/* Prevent iOS zoom on input focus (needs 16px+ font) */
@media screen and (max-width: 600px) {
  .digit-box {
    font-size: max(1.2rem, 16px);
  }
}

/* Friends / Leaderboards */
.friends-content {
  max-width: 100%;
}

.friends-name-setup,
.friends-create-view,
.friends-join-view {
  text-align: center;
  padding: 20px 0;
}

.friends-name-setup h2,
.friends-create-view h2,
.friends-join-view h2,
.friends-standings-view h2 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.friends-name-setup p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.friends-input-group {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 8px;
}

.friends-input-group input {
  flex: 1;
  max-width: 250px;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
}

.friends-input-group input:focus {
  border-color: var(--color-primary);
}

.friends-hint {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.friends-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 16px;
  padding-top: 12px;
}

.friends-username {
  font-size: 1.1rem;
  font-weight: 600;
}

.friends-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 20px;
}

.friends-boards-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.friends-board-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  color: var(--color-text);
  text-align: left;
  width: 100%;
  font-size: 1rem;
}

.friends-board-item:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-alt);
}

.friends-board-name {
  font-weight: 600;
}

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

.friends-empty,
.friends-error {
  color: var(--color-text-muted);
  text-align: center;
  padding: 20px 0;
  font-size: 0.9rem;
}

.friends-loading {
  color: var(--color-text-muted);
  text-align: center;
  padding: 20px 0;
}

.friends-standings-view {
  padding-top: 8px;
}

.friends-standings-tabs {
  display: flex;
  gap: 4px;
  justify-content: center;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: 16px;
}

.friends-tab {
  flex: 1;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.friends-tab.active {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.friends-standings-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}

.friends-standings-table th {
  text-align: left;
  padding: 8px 12px;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--color-border);
}

.friends-standings-table th:last-child {
  text-align: right;
}

.friends-standings-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.friends-standings-table td:first-child {
  width: 40px;
  font-weight: 700;
  color: var(--color-text-muted);
}

.friends-standings-table td:last-child {
  text-align: right;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.friends-standings-table tr.friends-me td {
  color: var(--color-primary);
}

.friends-standings-table tr.friends-me td:first-child {
  color: var(--color-primary);
}

.friends-days-played {
  font-size: 0.75em;
  opacity: 0.6;
}

.friends-standings-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
}

.friends-join-preview-card {
  margin-top: 16px;
  padding: 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
}

.friends-join-preview-card strong {
  font-size: 1.1rem;
}

.friends-join-preview-card span {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* Friend buttons */
.btn-primary {
  padding: 10px 20px;
  border: none;
  background: var(--color-primary);
  color: white;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-secondary {
  padding: 10px 20px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.2s;
}

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

.btn-danger {
  padding: 10px 20px;
  border: 1px solid var(--color-poor);
  background: transparent;
  color: var(--color-poor);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
}

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

.btn-icon {
  padding: 6px 10px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 1rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color 0.2s;
}

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

.btn-back {
  display: inline-block;
  margin-bottom: 12px;
  padding: 6px 12px;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color 0.2s;
}

.btn-back:hover {
  color: var(--color-text);
}

/* Friends toast */
.friends-toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--color-surface-alt);
  color: var(--color-text);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 1000;
  pointer-events: none;
}

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