:root {
  --bg: #1a1b1e;
  --bg-elevated: #25262b;
  --bg-input: #18181b;
  --text: #e4e4e7;
  --text-muted: #a1a1aa;
  --text-subtle: #71717a;
  --border: #3f3f46;
  --border-hover: #52525b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-muted: #4338ca33;
  --success: #22c55e;
  --success-muted: #16653433;
  --error: #991b1b;
  --error-muted: #7f1d1d33;
  --score-color: #f4f4f5;
}

[data-theme="light"] {
  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --bg-input: #f4f4f5;
  --text: #18181b;
  --text-muted: #3f3f46;
  --text-subtle: #71717a;
  --border: #e4e4e7;
  --border-hover: #d4d4d8;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-muted: #6366f133;
  --success: #16a34a;
  --success-muted: #22c55e33;
  --error: #dc2626;
  --error-muted: #fecaca33;
  --score-color: #18181b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "DM Sans", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.2s, color 0.2s;
}

.app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1.25rem 1rem;
}

.header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.theme-toggle {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.theme-toggle:hover {
  background: var(--border-hover);
  border-color: var(--border-hover);
  color: var(--text);
}

header {
  margin-bottom: 0;
}

h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.25rem 0;
}

.subtitle {
  margin: 0;
  color: var(--text-subtle);
  font-size: 0.95rem;
}

/* Setup */
.setup {
  background: var(--bg-elevated);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.setup-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

@media (max-width: 600px) {
  .setup-row {
    grid-template-columns: 1fr;
  }
}

.setup label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

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

.tags-json-hint {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-subtle);
}

.setup label.met-count-wrap {
  display: inline-flex;
  flex-direction: row;
}

.setup input[type="file"],
.setup textarea {
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-input);
  color: var(--text);
  font: inherit;
}

.setup textarea {
  resize: vertical;
  min-height: 120px;
}

#startBtn {
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  cursor: pointer;
  margin-bottom: 0.75rem;
}

#startBtn:hover:not(:disabled) {
  background: var(--accent-hover);
}

#startBtn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.setup-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.setup-or {
  color: var(--text-subtle);
  font-size: 0.9rem;
}

#demoBtn {
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
}

#demoBtn:hover:not(:disabled) {
  background: var(--border-hover);
  border-color: var(--border-hover);
}

.met-count-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: nowrap;
  white-space: nowrap;
}

.met-count-wrap #metBtn {
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
}

.met-count-wrap #metBtn:hover:not(:disabled) {
  background: var(--border-hover);
  border-color: var(--border-hover);
}

.met-count-wrap .met-count-label {
  font-size: 0.9rem;
  color: var(--text-subtle);
}

.met-count-wrap #metCount {
  width: 3rem;
  padding: 0.35rem 0.4rem;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text);
  vertical-align: middle;
}

#demoBtn:disabled {
  opacity: 0.7;
  cursor: wait;
}

.hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-subtle);
}

.hidden {
  display: none !important;
}

/* Game */
.game {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.game-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.game-header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.score-display {
  font-weight: 700;
  color: var(--score-color);
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.another-round-btn {
  padding: 0.4rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
}

.another-round-btn:hover:not(:disabled) {
  background: var(--border-hover);
  border-color: var(--border-hover);
}

.another-round-btn:disabled {
  opacity: 0.7;
  cursor: wait;
}

.instruction {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag-btn {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

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

.tag-btn.selected {
  border-color: var(--accent);
  background: var(--accent-muted);
}

.tag-btn.wrong-glow {
  box-shadow: 0 0 0 2px #dc2626, 0 0 16px #b91c1c;
  border-color: #dc2626;
  animation: wrong-glow-pulse 1s ease-out;
}

@keyframes wrong-glow-pulse {
  0% { box-shadow: 0 0 0 2px #dc2626, 0 0 20px #b91c1c; }
  70% { box-shadow: 0 0 0 2px #dc2626, 0 0 12px #b91c1c; }
  100% { box-shadow: 0 0 0 2px #dc2626, 0 0 0 #b91c1c; }
}

.tag-btn.done {
  border-color: var(--success);
  background: var(--success-muted);
  cursor: default;
}

.puzzle-wrap {
  background: var(--bg-elevated);
  border-radius: 12px;
  padding: 0.75rem;
}

.puzzle-grid {
  display: grid;
  gap: 2px;
  margin: 0 auto;
  max-width: 100%;
  aspect-ratio: 1;
  min-height: 280px;
  max-height: clamp(320px, 58vh, 550px);
}

.puzzle-grid .cell {
  background: var(--bg-input);
  background-size: cover;
  background-position: center;
  border-radius: 4px;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
}

.puzzle-grid .cell:hover:not(.solved) {
  transform: scale(1.02);
  box-shadow: 0 0 0 2px var(--accent);
}

.puzzle-grid .cell.selected {
  box-shadow: 0 0 0 3px var(--accent);
}

.puzzle-grid .cell.solved {
  background: var(--bg-elevated) !important;
  cursor: default;
  opacity: 0.4;
}

/* Gallery (when all reconstructed) */
.puzzle-gallery {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  min-height: 320px;
  padding: 0.5rem;
}

.gallery-prev,
.gallery-next {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.gallery-prev:hover:not(:disabled),
.gallery-next:hover:not(:disabled) {
  background: var(--border-hover);
  border-color: var(--border-hover);
}

.gallery-prev:disabled,
.gallery-next:disabled {
  opacity: 0.4;
  cursor: default;
}

.gallery-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.gallery-image-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-image-wrap canvas.gallery-current {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  cursor: pointer;
}

.gallery-image-wrap canvas.gallery-current:hover {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.gallery-caption {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.reconstructed-wrap h3 {
  margin: 0 0 0.75rem 0;
  font-size: 1rem;
  color: var(--text-muted);
}

.reconstructed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}

.reconstructed-item {
  background: var(--bg-elevated);
  border-radius: 8px;
  overflow: hidden;
}

.reconstructed-item h4 {
  margin: 0;
  padding: 0.5rem 0.6rem;
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-input);
  color: var(--text-muted);
}

.reconstructed-item .reconstructed-full {
  padding: 0.5rem;
  background: var(--bg-input);
  min-height: 80px;
}

.reconstructed-item .reconstructed-full canvas {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.reconstructed-item .reconstructed-empty {
  background: var(--bg-elevated);
  border-radius: 4px;
}

.feedback {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
}

.feedback.wrong {
  background: var(--error-muted);
  border: 1px solid var(--error);
  color: #fca5a5;
}

.feedback.correct {
  background: var(--success-muted);
  border: 1px solid var(--success);
  color: #86efac;
}

/* Fullscreen overlay (flash on correct + click to expand) */
.fullscreen-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  cursor: pointer;
}

.fullscreen-overlay-inner {
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.fullscreen-overlay-inner canvas {
  max-width: 100%;
  max-height: calc(100vh - 2rem);
  width: auto;
  height: auto;
  object-fit: contain;
  pointer-events: none;
}

.reconstructed-clickable {
  cursor: pointer;
}

.reconstructed-clickable:hover {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (min-height: 800px) {
  .puzzle-grid {
    max-height: clamp(360px, 62vh, 600px);
  }
}