/* Theme variables */
[data-theme="light"] {
  --bg: #f0f0f0;
  --text: #222;
  --surface: #fff;
  --accent: #4a90d9;
  --border: #ccc;
  --green: #4caf50;
  --red: #d32f2f;
  --muted: #888;
  --highlight: #e3f2fd;
  --highlight-dim: #f0f4f8;
}

[data-theme="dark"] {
  --bg: #1a1a1a;
  --text: #e0e0e0;
  --surface: #2a2a2a;
  --accent: #6ab0f3;
  --border: #444;
  --green: #66bb6a;
  --red: #ef5350;
  --muted: #999;
  --highlight: #1e3a5f;
  --highlight-dim: #252525;
}

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

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

h1, h2, h3 { font-family: Georgia, 'Times New Roman', serif; font-weight: normal; }

/* Layout */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.logo {
  font-family: Georgia, serif;
  font-size: 1.1rem;
  font-weight: bold;
  cursor: pointer;
  user-select: none;
}
.logo:hover { color: var(--accent); }

.header-controls { display: flex; align-items: center; gap: 12px; }

#user-display { font-size: 0.9rem; color: var(--muted); }

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 16px;
}

/* Game screens stay narrower for focus */
#screen-login, #screen-select, #screen-math, #screen-sudoku, #screen-reaction,
#screen-digit, #screen-word, #screen-minesweeper, #screen-nback, #screen-stroop {
  max-width: 700px;
  margin: 0 auto;
}

/* Screens */
.screen { display: none; }
.screen.active { display: block; }

/* Buttons */
button {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 8px 16px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

button:hover { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: default; }

.link-btn { background: none; border: none; color: var(--accent); padding: 8px 0; }
.link-btn:hover { text-decoration: underline; }

/* Login */
#screen-login { text-align: center; padding-top: 60px; }
#screen-login h1 { font-size: 2rem; margin-bottom: 30px; }

#login-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 280px;
  margin: 0 auto;
  text-align: left;
}

#login-form label { font-size: 0.85rem; color: var(--muted); }

#login-form input {
  padding: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
}

#login-form input:focus { outline: 2px solid var(--accent); outline-offset: -2px; }

#login-btn { margin-top: 8px; }

.error { color: var(--red); font-size: 0.85rem; min-height: 1.2em; }

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

/* Tabs (Dashboard | Graphs) */
.tabs {
  display: flex;
  gap: 16px;
  align-items: baseline;
}

.tab {
  font-family: Georgia, serif;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 2px 0;
}

.tab-active {
  color: var(--text);
  border-bottom: 2px solid var(--accent);
}

.tab-inactive {
  color: var(--muted);
  opacity: 0.5;
}

.tab-inactive:hover {
  opacity: 0.8;
}

/* User columns — 3 side-by-side columns with per-user heatmap + stats */
.user-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.user-column {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.user-column-title {
  text-align: center;
  font-size: 1.3rem;
  font-family: Georgia, serif;
  margin: 0 0 4px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent);
}

/* Stat cards inside user columns */
.stat-card {
  border: 1px solid var(--border);
  padding: 8px 10px;
  background: var(--highlight-dim);
}

.stat-card h4 {
  font-size: 0.85rem;
  margin: 0 0 6px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--border);
  font-family: Georgia, serif;
  font-weight: bold;
}

.stat-card .stat-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  padding: 1px 0;
}

.stat-card .stat-row.stat-top {
  font-size: 0.95rem;
  padding: 2px 0 6px;
  align-items: baseline;
}

.stat-card .stat-top .stat-label {
  color: var(--text);
  font-weight: bold;
  font-family: Georgia, serif;
}

.stat-card .stat-top-value {
  color: var(--accent);
  font-weight: bold;
  font-family: monospace;
  font-size: 1.05rem;
}

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

/* Heatmap inside user column */
.heatmap-wrap {
  padding: 4px 0;
}

.heatmap-label {
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.heatmap-grid {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 2px;
}

.heatmap-cell {
  aspect-ratio: 1;
  background: var(--highlight-dim);
  border-radius: 1px;
}

.heatmap-cell.played { background: var(--green); }
.heatmap-cell[title] { cursor: default; }

/* Score table */
.score-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.score-table th, .score-table td {
  padding: 6px 8px;
  border: 1px solid var(--border);
  text-align: left;
}

.score-table th { background: var(--highlight-dim); font-weight: bold; }

/* Per-user score tables grid (3 columns) */
.user-tables-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 12px;
}

.user-table-card {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 10px;
  overflow: hidden;
}

.user-table-title {
  font-size: 1rem;
  text-align: center;
  margin-bottom: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

.user-table-empty {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 12px 0;
}

.user-score-table {
  font-size: 0.78rem;
  table-layout: fixed;
  width: 100%;
}

.user-score-table th,
.user-score-table td {
  padding: 4px 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Date row — spans all columns, acts as a visual divider between days */
.user-score-table tr.date-row td {
  background: var(--highlight-dim);
  font-family: monospace;
  font-weight: bold;
  font-size: 0.72rem;
  color: var(--accent);
  padding: 3px 6px;
  border-top: 2px solid var(--accent);
  border-bottom: 1px solid var(--border);
  text-align: left;
}

/* First date-row in a table shouldn't have the extra top separator */
.user-score-table tr.date-row:first-of-type td {
  border-top: 1px solid var(--border);
}

/* Game selection */
#screen-select { text-align: center; padding-top: 40px; }
#screen-select h2 { margin-bottom: 30px; }

.game-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 300px;
  margin: 0 auto 20px;
}

.game-buttons button {
  padding: 16px;
  font-size: 1.1rem;
  font-family: Georgia, serif;
}

/* Game header */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.timer { font-size: 1.4rem; font-family: monospace; font-weight: bold; transition: color 0.15s; }
.timer.timer-penalty { color: var(--red); }

/* Math game */
.problem-display {
  font-size: 2.5rem;
  font-family: Georgia, serif;
  text-align: center;
  padding: 40px 0 20px;
}

#math-answer {
  display: block;
  width: 200px;
  margin: 0 auto;
  padding: 12px;
  font-size: 1.5rem;
  text-align: center;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

#math-answer:focus { outline: none; border-color: var(--accent); }

/* Sudoku */
.sudoku-area { display: flex; justify-content: center; }

.sudoku-grid {
  border-collapse: collapse;
  border: 3px solid var(--text);
  user-select: none;
}

.sudoku-grid td {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  text-align: center;
  vertical-align: middle;
  font-size: 1.2rem;
  cursor: pointer;
}

.sudoku-grid td:nth-child(3n) { border-right: 3px solid var(--text); }
.sudoku-grid tr:nth-child(3n) td { border-bottom: 3px solid var(--text); }

.sudoku-grid td.selected { background: var(--highlight); }
.sudoku-grid td.related { background: var(--highlight-dim); }
.sudoku-grid td.clue { font-weight: bold; }
.sudoku-grid td.editable { color: var(--accent); }
.sudoku-grid td.conflict { color: var(--red); }

/* Reaction */
.reaction-area {
  min-height: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: default;
  transition: background 0.05s;
}

.reaction-idle { background: var(--surface); }
.reaction-waiting { background: var(--red); }
.reaction-go { background: var(--green); }
.reaction-early { background: #ff9800; }

.reaction-message {
  font-size: 2rem;
  font-family: Georgia, serif;
  color: #fff;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

.reaction-idle .reaction-message { color: var(--text); text-shadow: none; }

.reaction-trial { font-size: 0.9rem; color: rgba(255,255,255,0.8); margin-bottom: 8px; }
.reaction-idle .reaction-trial { color: var(--muted); }

.reaction-results {
  margin-top: 16px;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.9);
}
.reaction-idle .reaction-results { color: var(--text); }

/* Result overlay — use class toggle, not hidden attribute */
.result-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.result-overlay.active {
  display: flex;
}

.result-overlay h2 { color: #fff; margin-bottom: 12px; }
.result-overlay .result-score { color: #fff; font-size: 2rem; font-family: Georgia, serif; margin-bottom: 20px; }
.result-overlay .result-actions { display: flex; gap: 12px; }
.result-overlay .result-status { color: #fff; font-size: 0.9rem; margin-top: 12px; min-height: 1.2em; }

/* Loading */
.loading { text-align: center; padding: 40px; color: var(--muted); }

/* Responsive */
/* Starred game buttons (core cognitive metrics) */
.game-star {
  color: var(--accent);
  margin-right: 4px;
}

/* N-Back */
.nback-area {
  text-align: center;
  min-height: 320px;
  cursor: pointer;
  user-select: none;
}
.nback-display {
  font-size: 6rem;
  font-family: Georgia, serif;
  font-weight: bold;
  min-height: 7rem;
  line-height: 1;
  margin: 20px 0;
  color: var(--accent);
}
.nback-progress {
  font-family: monospace;
  letter-spacing: 2px;
  color: var(--muted);
  margin-bottom: 12px;
  min-height: 1em;
}
.nback-hint {
  font-size: 0.85rem;
  color: var(--muted);
}

/* Stroop */
.stroop-area {
  text-align: center;
  padding: 30px 0;
}
.stroop-word {
  font-size: 4rem;
  font-family: Georgia, serif;
  font-weight: bold;
  min-height: 5rem;
  line-height: 1;
  margin: 20px 0 40px;
  transition: transform 0.15s;
}
.stroop-word.stroop-wrong {
  transform: scale(0.95);
  opacity: 0.5;
}
.stroop-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  max-width: 600px;
  margin: 0 auto;
}
.stroop-btn {
  padding: 18px 10px;
  border: 2px solid var(--border);
  color: #fff;
  font-weight: bold;
  font-size: 0.95rem;
  cursor: pointer;
}
.stroop-hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 20px;
}

/* Stat card collapsible details */
.stat-details {
  margin-top: 4px;
  border-top: 1px dashed var(--border);
  padding-top: 4px;
}
.stat-details summary {
  cursor: pointer;
  font-size: 0.72rem;
  color: var(--muted);
  padding: 2px 0;
  list-style: none;
  user-select: none;
}
.stat-details summary::-webkit-details-marker { display: none; }
.stat-details summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 4px;
  transition: transform 0.15s;
}
.stat-details[open] summary::before {
  transform: rotate(90deg);
}
.stat-details[open] summary {
  margin-bottom: 4px;
}
.stat-details .stat-row {
  padding-left: 12px;
}

/* Minesweeper */
.minesweeper-area { display: flex; flex-direction: column; align-items: center; gap: 8px; }

.minesweeper-grid {
  border-collapse: collapse;
  border: 2px solid var(--text);
  user-select: none;
}

.minesweeper-grid td {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  text-align: center;
  vertical-align: middle;
  font-size: 1rem;
  font-family: monospace;
  font-weight: bold;
  cursor: pointer;
}

.ms-hidden {
  background: var(--highlight-dim);
}

.ms-hidden:hover {
  background: var(--highlight);
}

.ms-revealed {
  background: var(--surface);
}

.ms-flagged {
  background: var(--highlight-dim);
  color: var(--red);
}

.ms-mine {
  background: var(--red);
  color: #fff;
}

.ms-exploded {
  background: #ff6b6b;
  color: #fff;
}

/* Number colors (Google Minesweeper style, theme-aware) */
.ms-revealed[data-n="1"] { color: #1976d2; }
.ms-revealed[data-n="2"] { color: #388e3c; }
.ms-revealed[data-n="3"] { color: #d32f2f; }
.ms-revealed[data-n="4"] { color: #7b1fa2; }
.ms-revealed[data-n="5"] { color: #c2185b; }
.ms-revealed[data-n="6"] { color: #00796b; }
.ms-revealed[data-n="7"] { color: #5d4037; }
.ms-revealed[data-n="8"] { color: #616161; }

.minesweeper-hint, .minesweeper-status {
  font-size: 0.85rem;
  color: var(--muted);
}

.minesweeper-status { color: var(--red); min-height: 1.2em; }

/* Digit Span */
.digit-area { text-align: center; padding: 40px 0; }
.digit-message { font-size: 1rem; color: var(--muted); margin-bottom: 20px; min-height: 1.2em; }
.digit-display {
  font-size: 4rem;
  font-family: monospace;
  letter-spacing: 0.2em;
  margin: 20px 0;
  min-height: 4.5rem;
  color: var(--accent);
}
#digit-input {
  display: block;
  width: 200px;
  margin: 0 auto;
  padding: 12px;
  font-size: 1.5rem;
  text-align: center;
  font-family: monospace;
  letter-spacing: 0.2em;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--text);
}
#digit-input:focus { outline: none; border-color: var(--accent); }

/* Word Recall */
.word-area { padding: 20px 0; }
.word-instruction { text-align: center; color: var(--muted); margin-bottom: 12px; }
.word-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  max-width: 600px;
  margin: 0 auto 20px;
}
.word-list .word-item {
  padding: 10px 12px;
  background: var(--highlight-dim);
  border: 1px solid var(--border);
  text-align: center;
  font-size: 1rem;
  font-family: Georgia, serif;
}
#word-input {
  display: block;
  width: 100%;
  max-width: 500px;
  margin: 0 auto 12px;
  padding: 10px;
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  resize: vertical;
}
#word-input:focus { outline: 2px solid var(--accent); outline-offset: -2px; }
#word-submit { display: block; margin: 0 auto; }

/* Graphs page */
.graphs-toolbar {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
}

.graphs-mode-btn {
  font-size: 0.85rem;
  padding: 4px 12px;
  background: var(--highlight-dim);
  color: var(--muted);
  border: 1px solid var(--border);
}

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

.graphs-mode-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.graphs-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.graph-column {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.graph-column-title {
  text-align: center;
  font-size: 1.3rem;
  font-family: Georgia, serif;
  margin: 0 0 4px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent);
}

.graph-card {
  border: 1px solid var(--border);
  background: var(--highlight-dim);
  padding: 6px 8px;
  overflow: hidden;
  min-width: 0;
}

.graph-label {
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 2px;
  font-family: Georgia, serif;
}

.graph-canvas {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 90px;
}

.graph-column { min-width: 0; }

@media (max-width: 800px) {
  .user-columns { grid-template-columns: 1fr; }
  .user-tables-grid { grid-template-columns: 1fr; }
  .graphs-container { grid-template-columns: 1fr; }
}

@media (max-width: 500px) {
  .sudoku-grid td { width: 36px; height: 36px; font-size: 1rem; }
  .problem-display { font-size: 1.8rem; }
  .game-buttons button { font-size: 1rem; padding: 12px; }
  .nback-display { font-size: 4.5rem; }
  .stroop-word { font-size: 3rem; }
  .stroop-buttons { grid-template-columns: repeat(2, 1fr); }
  .minesweeper-grid td { width: 26px; height: 26px; font-size: 0.85rem; }
}