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

:root {
  --bg: #121213;
  --text: #ffffff;
  --border: #3a3a3c;
  --border-light: #565758;
  --key-bg: #818384;
  --correct: #538d4e;
  --present: #b59f3b;
  --absent: #3a3a3c;
  --accent: #ffd166;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

header h1 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--accent);
  text-align: center;
  flex: 1;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.icon-btn:hover { background: var(--border); }

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 1.5rem;
  padding: 1rem 0.5rem;
  position: relative;
  max-width: 500px;
  width: 100%;
  margin: 0 auto;
  overflow: hidden;
}

.board {
  display: grid;
  grid-template-rows: repeat(6, 1fr);
  gap: 5px;
  padding: 10px;
  width: min(330px, 88vw);
  aspect-ratio: 5 / 6;
  max-height: calc(100vh - 280px);
}

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

.cell {
  border: 2px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  text-transform: uppercase;
  user-select: none;
  transition: border-color 0.1s, transform 0.1s;
}

.cell.filled {
  border-color: var(--border-light);
  animation: pop 0.1s ease-in-out;
}

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.cell.flip {
  animation: flip 0.6s ease forwards;
}

@keyframes flip {
  0% { transform: rotateX(0); }
  45% { transform: rotateX(90deg); }
  55% { transform: rotateX(90deg); }
  100% { transform: rotateX(0); }
}

.cell.correct { background: var(--correct); border-color: var(--correct); }
.cell.present { background: var(--present); border-color: var(--present); }
.cell.absent  { background: var(--absent);  border-color: var(--absent); }

.row.shake { animation: shake 0.5s; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.row.bounce .cell.correct,
.row.bounce .cell.present,
.row.bounce .cell.absent {
  animation: bounce 0.5s ease;
}
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  40% { transform: translateY(-15px); }
  70% { transform: translateY(-7px); }
}

.keyboard {
  display: flex;
  flex-direction: column;
  gap: 6px;
  width: 100%;
  padding: 8px 4px max(8px, env(safe-area-inset-bottom));
  background: var(--bg);
  flex-shrink: 0;
}

.keyboard-row {
  display: flex;
  gap: 4px;
  justify-content: center;
}

.key {
  background: var(--key-bg);
  border: none;
  color: var(--text);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  height: 50px;
  flex: 1;
  max-width: 42px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  transition: background 0.15s;
}

.key.wide { flex: 1.5; max-width: 60px; font-size: 0.7rem; }
.key:hover { filter: brightness(1.1); }
.key:active { transform: scale(0.95); }
.key.correct { background: var(--correct); }
.key.present { background: var(--present); }
.key.absent  { background: var(--absent); }

.toast {
  position: absolute;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 0.7rem 1.2rem;
  border-radius: 6px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  z-index: 100;
  white-space: nowrap;
}
.toast.show { opacity: 1; }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
}
.modal.hidden { display: none; }

.modal-content {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
  max-width: 460px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
}

.close-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.7rem;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 1.8rem;
  cursor: pointer;
}

.modal-content h2 { margin-bottom: 0.6rem; }
.modal-content h3 { margin: 1rem 0 0.5rem; font-size: 1rem; }
.modal-content p, .modal-content ul { margin: 0.4rem 0; line-height: 1.4; }
.modal-content ul { padding-left: 1.2rem; }

.example { margin: 0.8rem 0; }
.row.mini {
  display: flex;
  gap: 4px;
  margin-bottom: 0.4rem;
}
.row.mini .cell {
  width: 32px;
  height: 32px;
  font-size: 1.1rem;
  aspect-ratio: auto;
}

.small { font-size: 0.85rem; opacity: 0.7; }

.stats-row {
  display: flex;
  justify-content: space-around;
  margin: 1rem 0;
  text-align: center;
}
.stat-num { font-size: 1.8rem; font-weight: 700; }
.stat-label { font-size: 0.75rem; opacity: 0.7; }

.distribution { display: flex; flex-direction: column; gap: 4px; margin-top: 0.5rem; }
.dist-row { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; }
.dist-num { width: 12px; }
.dist-bar {
  background: var(--border);
  flex: 1;
  height: 22px;
  border-radius: 3px;
  position: relative;
  overflow: hidden;
}
.dist-fill {
  background: var(--key-bg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 6px;
  font-weight: 700;
  font-size: 0.8rem;
  min-width: 25px;
  transition: width 0.4s;
}
.dist-fill.win { background: var(--correct); }

.next-word {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.countdown { font-size: 1.4rem; font-weight: 700; font-family: monospace; }
.share-btn {
  background: var(--correct);
  color: var(--text);
  border: none;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  font-size: 1rem;
}
.share-btn:hover { filter: brightness(1.1); }

@media (max-width: 400px) {
  .board { padding: 6px; }
  .cell { font-size: 1.5rem; }
  .key { height: 44px; font-size: 0.8rem; }
  .key.wide { font-size: 0.6rem; }
}