/* === CSS Variables === */
:root {
  --bg-primary: #121213;
  --bg-secondary: #272729;
  --bg-tertiary: #1a1a1b;
  --border: #3a3a3c;
  --active-border: #565758;
  --text-primary: #f8f8f8;
  --text-secondary: #d7dadc;
  --text-muted: #818384;
  --green: #538d4e;
  --green-dark: #43703e;
  --yellow: #b59f3b;
  --gray-tile: #3a3a3c;
  --accent-green: #538d4e;
  --accent-text: #b5e0b0;
  --gold: #c5a257;
}

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

body {
  font-family: 'nyt-franklin', 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

/* === Header === */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 32px;
  font-weight: 900;
  letter-spacing: -1px;
  font-family: 'nyt-franklin', 'Clear Sans', 'Helvetica Neue', Arial, sans-serif;
}

#new-game-btn {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

#new-game-btn:hover { background: var(--bg-secondary); }

/* === Layout === */
main {
  display: flex;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.left-column {
  flex: 0 0 350px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.right-column {
  flex: 1;
  min-width: 0;
}

/* === Tile Grid === */
.tile-grid {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 20px;
}

.tile-row {
  display: flex;
  gap: 5px;
}

.tile {
  width: 62px;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  text-transform: uppercase;
  border: 2px solid var(--border);
  background: transparent;
  color: var(--text-primary);
  transition: background-color 0.2s;
}

.tile.active { border-color: var(--active-border); }
.tile.green { background: var(--green); border-color: var(--green); }
.tile.yellow { background: var(--yellow); border-color: var(--yellow); }
.tile.gray { background: var(--gray-tile); border-color: var(--gray-tile); }

/* === Input Area === */
.input-area {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

#word-input {
  width: 100%;
  padding: 12px;
  font-size: 18px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 4px;
  text-align: center;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  outline: none;
}

#word-input:focus { border-color: var(--text-secondary); }
#word-input.shake { animation: shake 0.4s ease-in-out; }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

.pattern-selector {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.pattern-tile {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 700;
  text-transform: uppercase;
  cursor: pointer;
  border: 2px solid var(--border);
  background: var(--gray-tile);
  color: var(--text-primary);
  border-radius: 2px;
  user-select: none;
  transition: background-color 0.15s;
}

.pattern-tile.green { background: var(--green); border-color: var(--green); }
.pattern-tile.yellow { background: var(--yellow); border-color: var(--yellow); }
.pattern-tile.gray { background: var(--gray-tile); border-color: var(--gray-tile); }

#analyze-btn {
  width: 100%;
  padding: 14px;
  font-size: 15px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  background: var(--green);
  color: var(--text-primary);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

#analyze-btn:hover { background: var(--green-dark); }
#analyze-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: var(--text-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

.hidden { display: none !important; }

/* === Guess History === */
.guess-history {
  width: 100%;
  margin-top: 8px;
}

.history-header {
  display: grid;
  grid-template-columns: 80px 60px 60px 90px 80px;
  gap: 4px;
  padding: 8px 0;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.history-row {
  display: grid;
  grid-template-columns: 80px 60px 60px 90px 80px;
  gap: 4px;
  padding: 10px 0;
  font-size: 14px;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  align-items: center;
}

.history-row .word { text-transform: uppercase; letter-spacing: 2px; }
.history-row.solved { color: var(--accent-green); }

/* === Analysis Panel === */
.empty-state {
  color: var(--text-muted);
  font-size: 14px;
  padding: 40px 0;
  text-align: center;
}

.section-header {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 16px;
  margin-top: 28px;
}

.section-header:first-child { margin-top: 0; }

/* ── Full history + bot comparison table ──────────────────────────────────── */
.fht-wrap {
  overflow-x: auto;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.fht {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
  white-space: nowrap;
}

/* Section group headers */
.fht-group-row th {
  padding: 6px 10px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.fht-group-row th:first-child {
  text-align: left;
}

/* The green separator lives on the first bot-section <td>/<th> in every row (Deprecated in interlaced view) */
.fht-bot-first {
  border-left: 2px solid var(--accent-green) !important;
}

.fht-group-row .fht-bot-section {
  border-left: 2px solid var(--accent-green);
}

.fht-bot-section {
  color: var(--accent-text) !important;
}

/* Interlaced Row Styles */
.fht-user-row td {
  color: var(--accent-green) !important;
  border-bottom: none !important;
  padding-bottom: 4px !important;
}

.fht-bot-row td {
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border) !important;
  padding-top: 4px !important;
}

.fht-who-me, .fht-who-bot {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.fht-who-bot {
  color: var(--text-muted);
}

.fht-turn-num {
  border-bottom: 1px solid var(--border) !important;
  vertical-align: middle !important;
  font-size: 14px;
}

/* Column sub-headers */
.fht-col-row th {
  padding: 5px 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: left;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
}

.fht-sub {
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--text-muted);
  opacity: 0.7;
}

/* Data rows */
.fht td {
  padding: 8px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
  vertical-align: middle;
}

.fht tbody tr:last-child td { border-bottom: none; }
.fht tbody tr:hover { background: var(--bg-tertiary); }

/* Solved row */
.fht-solved td { color: var(--accent-green); }

/* Bot word styling */
.fht-bot-word {
  color: var(--text-secondary);
}

/* Bot word == user's word: highlight in green */
.fht-bot-match {
  color: var(--accent-green) !important;
  font-weight: 700;
}

/* Monospace for E→A columns */
.fht-mono {
  font-family: 'Courier New', monospace;
  font-size: 11px;
  letter-spacing: 0;
}

/* Recommendations table */
.rec-table {
  width: 100%;
  border-collapse: collapse;
}

.rec-table th {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  text-align: left;
  padding: 8px 8px;
  border-bottom: 1px solid var(--border);
}

.rec-table td {
  padding: 8px 8px;
  font-size: 13px;
  border-bottom: 1px solid var(--border);
}

.rec-table tr { cursor: pointer; }
.rec-table tr:hover { background: var(--bg-tertiary); }

.rec-table tr.optimal {
  border-left: 3px solid var(--accent-green);
}

.rec-table .word-cell {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.rec-table .skill-cell {
  color: var(--accent-green);
  font-weight: 700;
}

/* Solution pool */
.pool-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  margin-top: 16px;
}

.pool-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.pool-header h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

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

.pool-words {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.word-chip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-primary);
}

.word-chip.more {
  color: var(--text-muted);
  background: transparent;
  border: 1px dashed var(--border);
}

/* Groups panel */
.groups-panel {
  margin-top: 16px;
}

.group-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 16px;
  margin-bottom: 8px;
}

.group-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.mini-tiles {
  display: flex;
  gap: 2px;
}

.mini-tile {
  width: 20px;
  height: 20px;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  line-height: 1;
}

.mini-tile.green { background: var(--green); }
.mini-tile.yellow { background: var(--yellow); }
.mini-tile.gray { background: var(--gray-tile); }

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

.group-guesses {
  font-size: 11px;
  color: var(--gold);
  font-weight: 700;
  margin-left: auto;
  padding: 2px 8px;
  background: rgba(196, 168, 79, 0.15);
  border-radius: 10px;
}

.group-words {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.group-word {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
  padding: 2px 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  padding: 12px 24px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-primary);
  z-index: 1000;
  transition: opacity 0.3s;
}

.toast.error { border-color: #c0392b; color: #e74c3c; }

/* === Responsive === */
@media (max-width: 768px) {
  main {
    flex-direction: column;
    padding: 16px;
    gap: 20px;
  }

  .left-column { flex: none; width: 100%; }

  .tile { width: 52px; height: 52px; font-size: 24px; }

  .pattern-tile { width: 44px; height: 44px; font-size: 18px; }

  .history-header,
  .history-row {
    grid-template-columns: 70px 50px 50px 80px 70px;
    font-size: 12px;
  }

  .rec-table .pool-col { display: none; }
}