:root {
  --bg: #ffffff;
  --text: #1a1a1b;
  --muted: #787c7e;
  --border: #d3d6da;
  --tile-empty: #ffffff;
  --key-bg: #d3d6da;
  --key-text: #1a1a1b;
  --correct: #6aaa64;
  --present: #c9b458;
  --absent: #787c7e;
  --accent: #1a1a1b;
}

html.dark {
  --bg: #121213;
  --text: #ffffff;
  --muted: #818384;
  --border: #3a3a3c;
  --tile-empty: #121213;
  --key-bg: #818384;
  --key-text: #ffffff;
  --correct: #538d4e;
  --present: #b59f3b;
  --absent: #3a3a3c;
  --accent: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  transition: background 0.2s, color 0.2s;
}

.app {
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: 3px;
}

.header-right {
  display: flex;
  gap: 4px;
}

.icon-btn {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  padding: 6px;
  color: var(--text);
}

.tabs {
  display: flex;
  gap: 8px;
  padding: 10px 16px 0;
}

.tab {
  flex: 1;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-weight: 700;
  cursor: pointer;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}

.tab.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.meta {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 8px 0 0;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px 8px;
  position: relative;
}

.board {
  display: grid;
  grid-template-rows: repeat(6, 1fr);
  gap: 6px;
  width: min(330px, 90vw);
  margin: 0 auto;
}

.row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

.tile {
  aspect-ratio: 1;
  border: 2px solid var(--border);
  background: var(--tile-empty);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text);
  border-radius: 4px;
  user-select: none;
}

.tile.filled {
  border-color: var(--muted);
}

.tile.correct {
  background: var(--correct);
  border-color: var(--correct);
  color: #fff;
}

.tile.present {
  background: var(--present);
  border-color: var(--present);
  color: #fff;
}

.tile.absent {
  background: var(--absent);
  border-color: var(--absent);
  color: #fff;
}

.tile.flip {
  animation: flip 0.5s ease;
}

@keyframes flip {
  0% { transform: rotateX(0); }
  50% { transform: rotateX(90deg); }
  100% { transform: rotateX(0); }
}

.row.shake {
  animation: shake 0.5s;
}

@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(4px); }
  30%, 50%, 70% { transform: translateX(-8px); }
  40%, 60% { transform: translateX(8px); }
}

.tile.bounce {
  animation: bounce 0.6s;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  30% { transform: translateY(-18px); }
  50% { transform: translateY(0); }
}

.toast {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  white-space: nowrap;
  z-index: 5;
}

.toast.show {
  opacity: 1;
}

.keyboard {
  padding: 10px 6px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 500px;
  margin: 0 auto;
  width: 100%;
}

.kb-row {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.key {
  flex: 1;
  max-width: 42px;
  height: 52px;
  border: none;
  border-radius: 4px;
  background: var(--key-bg);
  color: var(--key-text);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  text-transform: uppercase;
  transition: background 0.15s;
}

.key.wide {
  max-width: 66px;
  font-size: 0.7rem;
}

.key.correct {
  background: var(--correct);
  color: #fff;
}

.key.present {
  background: var(--present);
  color: #fff;
}

.key.absent {
  background: var(--absent);
  color: #fff;
  opacity: 0.6;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 20;
}

.overlay.show { display: flex; }

.modal {
  background: var(--bg);
  color: var(--text);
  border-radius: 10px;
  padding: 24px;
  max-width: 420px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  border: 1px solid var(--border);
}

.modal h2 {
  margin-top: 0;
  text-align: center;
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
}

.modal ul {
  padding-left: 20px;
  line-height: 1.5;
}

.example-row {
  display: flex;
  gap: 4px;
  margin: 8px 0;
}

.example-row .tile {
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
}

.close-x {
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text);
}

.stats-grid {
  display: flex;
  justify-content: space-around;
  text-align: center;
  margin: 16px 0;
}

.stats-grid .stat-num {
  font-size: 1.8rem;
  font-weight: 700;
  display: block;
}

.stats-grid .stat-label {
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
}

.dist {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.dist-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
}

.dist-bar-wrap {
  flex: 1;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.dist-bar {
  background: var(--absent);
  color: #fff;
  text-align: right;
  padding: 2px 6px;
  font-weight: 700;
  font-size: 0.75rem;
  min-width: 20px;
  white-space: nowrap;
}

.dist-bar.highlight {
  background: var(--correct);
}

.stats-footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
}

.end-modal { text-align: center; }

.grid-preview {
  display: flex;
  flex-direction: column;
  gap: 3px;
  align-items: center;
  margin: 14px 0;
  font-size: 1.2rem;
  line-height: 1;
}

.end-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 10px;
}

.end-actions button {
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
}

.end-actions button:first-child {
  background: var(--correct);
  color: #fff;
  border: none;
}

@media (max-width: 380px) {
  header h1 { font-size: 1.5rem; letter-spacing: 2px; }
  .key { height: 46px; }
}